Experiments with cathode rays led Thomson to propose that the electron was a negatively charged particle.
What is meant by cathode ?
The positive terminal of a battery or other source of electrical energy via which electrons exit and the cathode, negative terminal or electrode through which they enter a direct current load, such as an electrolytic cell or an electron tube.The anode is the negative or reducing electrode that undergoes electrochemical reactions and delivers electrons to the external circuit while oxidising.The positive or oxidising electrode known as the cathode is decreased during the electrochemical process after receiving electrons from the external circuit.An x-ray tube's cathode serves to expel the electrons from the circuit and concentrate them in a beam on the anode's focal spot.To learn more about cathode refer to
https://brainly.com/question/29784733
#SPJ4
C3H8 + 5O2 → 3CO2 + 4H2O
How many grams of H2O would be produced if you start with 0.75 moles of C3H8?
___________ g of H2O
Answer:
Rewrite the equation in standard form.
C3H8 + 5O2 ==> 3CO2 + 4H2O.
2. Convert 8.5 x 10^22 molecules proper into molecules . Remember 1 mole contains 6.02 x 10^23 molecules.
3. Using the confficients in the balanced equation, convert moles propper to moles H2O.
4. Convert mols H2O to grams. g = moles x molar mass.
If you start with 0.75 moles of C₃H₈, you would produce 54 grams of H₂O.
Moles (mol) are a unit of measurement used to express the amount of a substance. One mole of a substance is defined as the amount of that substance that contains the same number of particles (atoms, molecules, or ions) as there are atoms in exactly 12 grams of carbon-12. This number is known as Avogadro's number, which is approximately 6.022 x 10²³ particles per mole.
The mole is used to relate the mass of a substance to its chemical formula and to perform stoichiometric calculations.
The balanced equation is:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
From the equation, every 1 mole of C₃H₈, 4 moles of H₂O are produced.
Moles of H₂O = (0.75 moles C₃H₈) x (4 moles H₂O / 1 mole C₃H₈)
= 3 moles H₂O
Mass of H₂O = (3 moles H₂O) x (18 g/mol)
= 54 g
Learn more about Moles, here:
https://brainly.com/question/15209553
#SPJ6
Nitrogen's electronegativity value is between those of phosphorus and oxygen.
Which of the following correctly describes the relationship between the three values?
A. The value for nitrogen is less than that of phosphorus because nitrogen is larger, but greater than that of oxygen because nitrogen has a greater effective nuclear charge.
B. The value for nitrogen is less than that of phosphorus because nitrogen has fewer protons but greater than that of oxygen because nitrogen has less valence electrons.
C. The value for nitrogen is greater than that of phosphorus because nitrogen has less electrons, but less than that of oxygen because nitrogen is smaller.
D. The value for nitrogen is greater than that of phosphorus because nitrogen is smaller, but less than that of oxygen because nitrogen has a smaller effective nuclear charge.
The correct relationship between the three values will be the value for nitrogen is greater than that of P because N is smaller, but less than that of O because N has a smaller effective nuclear charge.
Electronegativity is the chemical property which describes the tendency of an atom or a functional group which attract electrons toward itself. The electronegativity of an atom will be affected by both its atomic number as well as the distance that its valence electrons reside from the charged nuclei.
The electronegativity of phosphorus will be 2.19 is much less electronegativity than to the nitrogen. The electronegativity of nitrogen will be 3.04. 4. Phosphorus will expand its valence shell to hold more than eight electrons, but nitrogen cannot.
To know more about electronegativity here
https://brainly.com/question/17762711
#SPJ4
Correctly order the steps necessary to determine the molecular formula for a compound using combustion analysis data. Start with the first step at the top of the list. 1 Place these in the proper order. Determine the masses of carbon and hydrogen from the masses of Co, and H,0. Determine the molecular formula using the empirical formula and the molar mass. Determine the number of moles of each element in the compound and hence the empirical formula Determine the mass of oxygen, if present, by subtracting the masses of carbon and hydrogen from the total mass. Do you know the answer? I know it Think so Unsure No idea
The following is the right procedure to find out molecular formula of the compound these are steps:
Determine the mass of Carbon & Hydrogen from the CO₂ and H₂ODetermination of Oxygen , if presentDetermining the number of moles of each element and hence empirical formulaDetermining the molecular formula from the emprical formulaFrom a combustion analysis, how can you get the molecular formula?Take the grams of carbon, hydrogen, and oxygen and use them to calculate the empirical formula of the chemical. To find n, multiply the given molecular mass by the empirical formula mass and then compute the formula mass for the empirical formula. The molecular formula is obtained by multiplying each of the empirical formula's subscripts by n.
Do the empirical formula's molar mass calculations. Molecular mass determined using the empirical formula divided by the molecular mass provided. Add the entire number that was generated in step 2 to each subscript. The molecular equation is now this.
The molecular formula is obtained by multiplying each of the empirical formula's subscripts by n.
To learn more about molecular formula refer to:
brainly.com/question/26388921
#SPJ4
(30 points) you wish to prepare a buffer of ph 7.4. circle which of the following systems should you choose and calculate the ratio of conjugate base to acid that you would need to make such a buffer? show your work.
The conjugate acid of a weak base, such as ammonia and an ammonium ion salt, can also be used to create buffers.
The best way to create a pH 7 buffer?Add 50 ml of potassium dihydrogen phosphate to 29.1 ml of 0.1 molar NaOH. Alternatively: Pour 1 liter of distilled water into a bowl and add 1.20 grams of sodium dihydrogen phosphate and 0.885 grams of disidium hydrogen phosphate.The conjugate acid of a weak base, such as ammonia and an ammonium ion salt, can also be used to create buffers. Each of these buffers has a significant distinction. An acidic buffer with a pH under 7 is created by combining HOAc and the OAc- ion. Basic buffers with a pH greater than 7 are formed by NH3 and NH4+ ion mixtures.To learn more about buffers refer to:
https://brainly.com/question/4177791
#SPJ4
An organic molecule must contain carbon and nitrogen. True or false
Answer: False
Explanation:
Except for a few substances like carbonates, carbides, cyanides, and cyanates, every molecule that includes carbon and hydrogen is considered to be organic. A molecule need not include nitrogen to be regarded as organic.
Amino acids, proteins, and nucleic acids are examples of organic molecules that include both carbon and nitrogen. However, not all organic substances contain nitrogen. The most prevalent organic substances are hydrocarbons and their derivatives, which are made up entirely of hydrogen and carbon.
It is essential to remember that the term "organic" is used in various settings and denotes various things depending on the industry.
While "organic" refers to items produced without the use of synthetic pesticides, fertilizers, or other chemicals in agriculture and food science, the term "organic" is used to designate substances that include carbon and hydrogen in chemistry.
a simplified model of benzene, c6h6, shows the six carbon atoms in a ring with alternate single and double bonds between the carbon atoms. each carbon atom is also bonded to one hydrogen atom. based on this model predict the c-c-c bond angle in benzene.
Based on the model of Neil Bohr, The C-C-C bond angle in benzene is 120 degree. This is because of resonance stabilized.
Based on the simplified model of benzene, C6H6, in which the six carbon atoms are arranged in a ring with alternate single and double bonds between them, the C-C-C bond angle is expected to be around 120 degrees. This is because the double bonds between the carbon atoms in benzene are considered to be "resonance stabilized", meaning that the electrons in the double bond are spread out over all six carbon atoms in the ring. This delocalization of electrons results in an increased stability for the compound, and it also causes the bond angles to be slightly smaller than the ideal bond angle of a tetrahedral carbon atom, which is 109.5 degrees. It's important to note that the bond angles in benzene are not exactly 120 degrees, but are intermediate between the angles expected for single (around 109.5 degrees) and double (around 180 degrees) carbon-carbon bonds, the exact bond angles of benzene are around 120.7 degrees, and this is a result of the pi-electron distribution in the ring.
To know more about benzene please refer: https://brainly.com/question/14525517
#SPJ4
When silver nitrate is mixed with potassium chloride, a double replacement reaction occurs. What are the products of this reaction?
AgNO3 + KCl -> ?
The products of the reaction as shown are silver chloride and potassium nitrate. option A
What is a reaction?If we talk about a reaction we have to look at the kind of combination in which there is the mixture of two or more substance that can be able to interact in some ways and then give rise to a product that is different from the products that were combined.
Here in the case of what we have here there is the combination of the silver nitrate and the potassium chloride and the products of the double replacement reaction that we would get are the silver chloride and the potassium nitrate.
Learn more about reaction:https://brainly.com/question/28984750
#SPJ1
Suppose an analytical chemist receives a sample of groundwater with a measured volume of 76.0 mL. Calculate the maximum mass n micrograms cadmium which the chemist could measure in this sample and still certify that the groundwater from which it standards came met Minnesota Department of Health Be sure your answer has the correct number of significant digits.
The maximum mass the micrograms of cadmium the chemist could measure in this sample is 3 × 10⁻¹ micrograms.
The limit for cadmium = 4.00 μg/L
The μg is called as micrograms.
An analytical chemist receives the sample of the groundwater with measured volume = 76.0 mL
The concentration expression is given as :
Concentration = mass / volume in L
where,
Mass = 4.00 μg
Volume = 0.076 L
Th mass is given as :
Mass = concentration × volume
Mass = 4 × 0.076
Mass = 3 × 10⁻¹ micrograms
Thus, the mass of cadmium is 3 × 10⁻¹ micrograms.
To learn more about mass here
https://brainly.com/question/14266954
#SPJ4
18. If 25.0 grams of ice at 0°C are heated at a constant rate of 400.0 joules/minute, calculate the time needed to
melt the sample completely. SHOW WORK.
I need help with this as well
It takes 8,350 joules of heat, or 2,000 calories, to melt 25 grams of ice.
How much heat is required to melt 25.0 g of ice at 0 C?The heat of fusion is the quantity of heat energy needed to convert a substance from a solid to a liquid state of matter. As the enthalpy of fusion, it has another name. Typically, it measures energy in joules per gram (J/g) or calories per gram (Cal/g). Calculating the amount of energy needed to melt a sample of water ice is shown how to do in this example problem.Examples:
To melt 25 grammes of ice, how much heat, in Joules, is needed? The heat in calories is what?
334 J/g = 80 calories per gramme of food containing water.
Solution
Heat of fusion is specified in the problem. Not off the top of your head knowledge, this is not a number. Common values for the heat of fusion are listed in chemistry tables.
You will need the equation relating heat energy to mass and heat of fusion in order to tackle this issue:
When q = heat energy and m = mass, q = mHf.
The heat of fusion is Hf.
Since it is unaffected by a change in matter's condition, temperature is not a factor in the equation. Making sure you are using the appropriate units for the answer is crucial because the equation is quite simple.
Converting heat into Joules:
q = (25 g)x(334 J/g)
q = 8350 J
In terms of calories, it's equally simple to describe the heat:
q = m·ΔHf
q = (25g)x(80cal/g)
q = 2000 cal
Answer: It takes 8,350 joules of heat, or 2,000 calories, to melt 25 grammes of ice.
To Learn more About joules of heat Refer To:
https://brainly.com/question/25603269
#SPJ1
Match the term with the correct response.
4% milkfat
2% or 1% milkfat
less than .02% milkfat
35% to 40% milkfat
15% to 18% milkfat
Following are the match-ups of different milkfats.
Whole milk (3.25% milk fat), reduced-fat milk (2%), low-fat milk (1%), and fat-free milk, sometimes known as skim milk, are the four main forms of milk that are readily available. Each one has 8 grammes of high-quality protein and 13 other necessary elements. The quantity of fat in each type of milk, expressed as a percentage of milkfat, varies. To display the milkfat at a glance, these percentages are mentioned on the box and via the various cap colours.
All milk, including fat-free, low-fat, organic, and lactose-free varieties, remains a naturally nutrient-rich, straightforward, and healthful food. However, the amount of milk fat does impact the number of calories and fat in each serving.
4% milkfat whole milk2% or 1% milkfat reduced fat milkless than .02% milkfat skim or fat-free35% to 40% milkfat heavy cream15% to 18% milkfat half-and-half
To learn more about Milkfat from given link
https://brainly.com/question/29942756
#SPJ4
which of the following can be accomplished by connecting a photovoltaic solar panel to a hydrogen fuel cell?
a. Solar Power and Cell
b. solar Cell
c. Photovoltaic Cells
d. solar panel's
a. Solar Energy and the Cell. By connecting a photovoltaic solar panel to a hydrogen fuel cell, the following may be accomplished: Photovoltaic panels or mirrors are used to concentrate solar energy.
Solar radiation is used by photovoltaic panels to convert sunlight into electrical energy. This energy can be turned into electricity or stored as thermal energy in batteries. Solar cells, often known as photovoltaic cells, convert sunlight directly into electricity. The term photovoltaics (abbreviated PV) comes from the photovoltaic effect, which is the process of converting light (photons) to energy (voltage). Photovoltaic solar energy is a type of clean, sustainable energy that creates electricity via the use of solar radiation. It is based on the photoelectric effect, which happens when specific materials absorb photons (light particles) and release electrons, resulting in the photoelectric effect.
learn more about photovoltaic here:
https://brainly.com/question/18417187
#SPJ4
when 1,2-dibromo-1-phenylethane is heated with sodium hydroxide, a compound with the ir spectrum provided is produced. propose a structure for this product.
Manufacturers can employ sodium hydroxide to create products including soap, rayon, paper, explosives, colors, and petroleum goods. Other uses for sodium hydroxide include cleaning and processing metal, coating metal with oxide, electroplating, and electrolytic extraction.
Sodium hydroxide has a potent corrosive and irritant effect. Any tissue that it comes into contact with could be severely burned and permanently harmed. Proteins can be hydrolyzed by sodium hydroxide, which can result in burns to the eyes and possibly long-term damage to the eyes. The United States Environmental Protection Agency (EPA), the International Agency for Research on Cancer (IARC), and the Department of Health and Human Services (DHHS) has not classified sodium hydroxide for carcinogenicity in humans.
Learn more about Sodium hydroxide here:-
https://brainly.com/question/24010534
#SPJ4
Arrange the necessary steps in order for finding the molecular formula of an unknown compound from mass percent data. Place the first step at the top of the list.
To find the molecular formula of an unknown compound from mass percent data, you can follow these steps. determine the molar mass of the compound by adding up the molar masses of each element present in the compound, using the mass percent data as a guide.
What are the necessary steps in order for finding the molecular formula?Use the molar mass and the empirical formula mass (which can be calculated from the empirical formula) to calculate the number of empirical formula units in the compound.Use this information to determine the molecular formula of the compound.First, determine the mass percent of each element present in the compound.Then, convert the mass percent of each element to moles by dividing by the molar mass of the element.Next, divide the moles of each element by the total moles of all elements to find the mole fraction of each element.Divide the mole fraction of each element by the smallest mole fraction. This gives you the subscripts in the empirical formula.From the empirical formula, calculate the formula mass and the molar mass of the compound Compare the molar mass and formula mass, and calculate the number of empirical formula units in the compound.Multiply the subscripts of the empirical formula by the number of formula units to find the molecular formula.It's important to note that the above steps are theoretical and in real-life scenarios, some analytical techniques like Mass Spectrometry(MS), Infrared Spectroscopy (IR), Nuclear Magnetic Resonance (NMR) spectroscopy, and X-ray Crystallography (XRD) are used to confirm the molecular formula of the compound.To learn more about molecular formula refer:
brainly.com/question/15960587
#SPJ4
A region of the IR spectrum can be used to differentiate between similar compounds that contain the same functional groups. Select the correct name of this region. O O O the downfield region the fingerprint region the functional group region the Ri region
The fingerprint region is the right term for this area. The IR spectrum of a molecule is a graphical depiction of the vibrational frequencies of the molecule's bonds.
The fingerprint area is the portion of the IR spectra between 1,000 and 400 cm-1 that is frequently used to distinguish between identical molecules with the same functional groups. This is due to the fact that each molecule has a unique bond configuration, which results in a unique set of vibrational frequencies.The fingerprint region is the right term for this area. The IR spectrum of a molecule is a graphical depiction of the vibrational frequencies of the molecule's bonds. It is possible to identify individual molecules and distinguish between similar ones by studying the peaks in the fingerprint area.The remaining areas indicated, the downfield, functional group, and Ri regions, are not typically used to define the IR spectrum.
learn more about IR spectrum here:
https://brainly.com/question/29753353
#SPJ4
thefunctionalgroupregion These are often connected to functional group stretching vibrationsA functional group's stretching vibrations are restricted to a small range
Functional connection is defined as the geographically dispersed neurophysiological events' temporal coherence (Friston, 1994). In other words, if there is a statistical link between the activity measurements that have been recorded for two areas, then those two regions are said to exhibit functional connectivity. This connection strategy is based on the idea that if two regions' functional activity is regularly associated, then those two areas are assumed to be connected or to be parts of the same network Functional connectivity is a considerably more direct method of analysing functional networks than effective connectivity studies, which rely on a number of assumptions about the underlying neurobiology and the model used to predict it. Particularly it is in agreement with the intuitive
Learn more about connected to functional here:
https://brainly.com/question/29739406
#SPJ4
when aqueous naoh is added to a solution containing al3 , a solid forms, but as more naoh solution is added the solid dissolves. which of the following best describes why the solid dissolves?
A solid that appears when aqueous naoh is added to an al3-containing solution; however, the solid dissolves as more naoh solution is added. due to the amphoteric nature of aluminium.
which allows it to react with both bases and acids. Aluminium ions are eager to accept two electrons because of how acidic they are. The chemical element aluminium, also known as aluminium in American and Canadian English, has an atomic number of 13 and the symbol Al. Aluminium is less dense than most common metals, with a density around one third that of steel. an electric charge Having a negative charge, an electron is a particle. The negative charge is 1.602 10-19 coulomb in magnitude. A proton's mass is 1/1837 that of an electron.
Learn more about atomic number here
https://brainly.com/question/16858932
#SPJ4
which of the following compounds are drawn in the cis configuration? O b only O b, d, and e only O a and b only O d only
If the two substituents are on the same side of the double bond, the bond has a cis conformation. From the diagram below, B, D, and E only have the cis configuration.
If the two substituents are on the opposite sides of the double bond, the double bond has a trans configuration. In the context of chemistry, trans denotes that the functional groups (substituents) are on the same side of some plane, whereas cis implies that they are on the other (transverse) side. The same plane contains all six atoms. The cis isomer has two "X" and "Y" groups on the same side of the double bond. In the trans isomer, the "X" and "Y" groups are situated on opposite sides of the double bond. They do not interconvert because there is no rotation around the bond.
To learn more about isomers click here https://brainly.com/question/12796779
#SPJ4
complete question: which of the following compounds are drawn in the cis configuration? 1.D only 2. B only 3. B, D, and E only 4. A and B only
Calculate ph of 1,0 mol/l of solution NH4Cl
Answer:
4.74.
Explanation:
The equilibrium equation for the hydrolysis of NH4+ is:
NH4+ + H2O ⇌ NH4OH + H+
The Cl- ion is a strong base and will not undergo hydrolysis in water. Therefore, the Cl- ion will not affect the pH of the solution.
Use the equilibrium constant for the hydrolysis of NH4+ (Kb) to calculate the pH of the solution.
The expression for the equilibrium constant for the hydrolysis of NH4+ is:
Kb = [NH4OH][H+] / [NH4+]
Given that the concentration of NH4Cl is 1.0 mol/L, the concentration of NH4+ ions is also 1.0 mol/L.
The concentration of hydroxide ions (OH-) can be calculated from the Kb expression:
Kb = [NH4OH][H+] / [NH4+]
[OH-] = Kb * [NH4+]
Knowing that the Kb for NH4+ = 1.810^-5
[OH-] = 1.810^-5 * 1.0 = 1.8*10^-5 M
The pH of the solution is the negative logarithm of the hydroxide ion concentration:
pH = -log([OH-])
pH = -log(1.8*10^-5)
pH = 4.74
Therefore, the pH of 1.0 mol/L solution of NH4Cl is 4.74.
pose you choose the initial masses so that both reactions produce pcl3. explain how both of these chemical reactions obey the law of definite proportions, even though they produ
In the field of chemistry known as stoichiometry, the goal is to ascertain the needed quantitative data by using relationships between the reactants and/or products of a chemical process.
What in chemistry is reaction stoichiometry?The quantitative relationship between the chemicals that take part in diverse chemical reactions is described by reaction stoichiometry.In the field of chemistry known as stoichiometry, the goal is to ascertain the needed quantitative data by using relationships between the reactants and/or products of a chemical process.The equation above shows how the components K and Cl immediately combine to generate the compound KCl.In the field of chemistry known as stoichiometry, the goal is to ascertain the needed quantitative data by using relationships between the reactants and/or products of a chemical process.The complete question is,
Suppose you set the initial masses so that both reactions result in PCl3. Describe how the laws of definite and definite obeyed in both of these chemical reactions.
To learn more about stoichiometry refer to:
https://brainly.com/question/14935523
#SPJ4
A/An _______ is composed of two or more types of matter that can be present in varying amounts.
A heterogenous mixture is composed of two or more types of matter that can be present in varying amounts.
What is heterogenous mixture?Heterogenous mixtures is defined as a type of mixture where in the composition is not uniform throughout the mixture.It consists as two or more phases. The phases are chemically distinct from each other.
As there are two or more phases present in heterogenous mixtures they can be separated by solvent extraction where in one phase is miscible with the solvent and the other phase is immiscible.
Components of a heterogenous mixtures are distinctly visible . There are two types of heterogenous mixtures, the colloids and the suspensions.These two vary with each other with respect to particle size.
Learn more about heterogenous mixtures,here:
https://brainly.com/question/29207752
#SPJ1
A hydrogen bond is a special type of a. induced dipole - induced dipole bond b.ionic bond c. dipole - dipole bond d. covalent bond
Option C is the right response since a hydrogen bond is a specific type of dipole-dipole link. A hydrogen bond, also known as the intermolecular force, produces a particular type of dipole-dipole attraction (IMF).
when two electronegative atoms that are connected by hydrogen bond to a strongly electronegative atom are nearby, one of them having a lone pair of electrons. Intermolecular forces, or IMFs, exist between molecules. The phrase "intermolecular forces," or "IMF," refers to the attractive and repulsive forces that form between the molecules of a substance. Through the use of these forces, certain molecules of a substance communicate with one another. The attraction between two hydrogen atoms known as a hydrogen bond (or H-bond) in chemistry is primarily brought on by electrostatic forces (H)
Learn more about hydrogen bond here
https://brainly.com/question/21054466
#SPJ4
which of the following accurately describes the reaction shown above N2+3H2=2NH3
The reaction would go left under increased pressure.
What is the best statement?Though the question is incomplete and I can't find the complete answer online, I can try to give you an overview about the reaction. If we look at this reaction we can see that it is a reversible reaction.
We then know that the conditions of the reaction is what is going to determine the direction that the reaction is going to go in the system. Given the fact that we have more volumes on the left than on the right, the reaction would move to the left if the pressure is increased.
Learn more about reaction:https://brainly.com/question/28984750
#SPJ1
Suppose that a Normal model describes the acidity (pH) of rainwater, and that water tested after last week's storm had a z-score of 1.8. This means that the acidity of that rain Select one: A. had a pH 1.8 times that of average rainwater. B. had a pH of 1.8. C. had a pH 1.8 higher than average rainfall. D. had a pH 1.8 standard deviations higher than that of average rainwater.E. varied with a standard deviation of 1.8.
For the question asked, the correct option is (D) i.e. 1.8 standard deviations higher in pH than the typical rainfall.
A z-score is a measure of how many standard deviations a particular data point lies from the mean of a normal distribution. If the pH of the rainwater after last week's storm has a z-score of 1.8, this means that the acidity of the rain was 1.8 standard deviations higher than the mean acidity of average rainfall. It is important to note that the pH scale is logarithmic, so a change of one unit in pH represents a ten-fold change in acidity. Therefore, a change of 1.8 units in pH represents a ten-fold change raised to the power of 1.8, which is a substantial increase in acidity.
To know more about pH please refer: https://brainly.com/question/29766400
#SPJ4
Find the mass of aluminum required to produce 4.72 L of hydrogen gas at stp from the reaction described by the following equation: 2L + 3H2SO4 → AL2(SO4)3 + 3H2
The mass of aluminum required to produce 4.72 L of hydrogen gas at stp from the reaction 27g.
The mass of aluminum can be found in several ways?Protons or electrons, whichever is greater, make up the atomic number. Changing the neutron count from 14 to 13 and the atomic number. Therefore, aluminum's atomic mass is 13+14=27u.According to the periodic table, the mass of one mole of Al atoms is calculated to be 26.98 g, rounded to two decimal places.The mass of the compound's formula is calculated by summing the masses of its constituent atoms. The ions can be regarded as atoms in order to determine the formula mass because a proper formula is electrically neutral (with no net electrons gained or lost).Explanation:
13+14 =27.
To learn more about Mass refer to:
https://brainly.com/question/19385703
#SPJ4
What should you do with unused chemicals?
A. Return them to their original containers.
B. Throw them away with the regular trash.
C. Dump them down the sink.
D. Dispose of them as instructed on the safety ta sheet (SDS).
You should dispose of them as instructed on the safety data sheet (SDS).
What is SDS for chemicals?A Safety Data Sheet, formerly known as a Material Safety Data Sheet, is a thorough informational document created by a hazardous chemical's producer or importer. It gives a description of the product's chemical and physical characteristics.A safety data sheet (SDS), formerly known as a material safety data sheet (MSDS), is a document that offers details on the characteristics of dangerous chemicals, how they impact workplace health and safety, and how to handle dangerous substances in the workplace.Previously known as an MSDS (Material Safety Data Sheet), an SDS (Safety Data Sheet). Both MSDS and SDS documents serve the same function, which is to provide information about occupational health and safety for the various applications of the substances and goods.Learn more about Safety data sheet refer to :
https://brainly.com/question/23694150
#SPJ4
which of the following choices provides the most probable values for the first four ionization energies of aluminum
The most probable values for the first four ionization energies of the aluminum are : IE₁ = 578 kJ/mol, IE₂ = 1817 kJ/mol, "IE₃ = 2745 kJ/mol", IE₄ = 11577 kJ/mol.
The ionization energy is the amount of the energy required to remove the electron from an atom. The electronic configuration of Al is given as :
Al electronic configuration = 1s² 2s² 2p⁶ 3s² 3p¹. The fourth ionization energy is comparatively high because the 2p subshell is fully filled and the energy required to remove the electron from the stable electronic configuration will be high. Therefore, the fourth ionization energy is high.
To learn more about ionization energy here
https://brainly.com/question/29629534
#SPJ4
Question:
Arrange these elements in order of decreasing atomic size: sulfur, chlorine, aluminum, and sodium. Does the arrangement demonstrate a periodic trend or a group trend?
Periodic Table:
All known elements in existence are neatly outlined in a table that we know as the "periodic table of elements". The periodic table is arranged in terms of increasing atomic numbers. Note that, by definition, elements are substances that are only broken down into their component atoms. Hence, substances like water or soil are not found in the periodic table despite being touted as "elements" by mythological sources.
Na>Al>S>Cl is the order in which the atomic sizes of the above elements decrease. We shall arrange the four specified elements in decreasing atomic radii order since they are all within the same time period.
Atomic radii in the periodic table decrease across a row from left to right and increase across a column from top to bottom. Due to these two patterns, the periodic table's lower left and upper right corners, respectively, contain the largest and smallest atoms. You can use the periodic table to keep track of broad principles or "trends" that are shown on the table. One such pattern is the atomic radius.
To learn more about atomic radii click here https://brainly.com/question/14086621
#SPJ4
You are making a fluorescence measurement at a concentration of 500 pM and get a signal to noise of 5. If you need a detection limit of 75 pM, by how much do you need to increase the source power? Assume all you noise is from the instrument so you can use the 3 x standard deviation definition.
By -320 pM, we need to increase the source power. A fluorescent material begins to produce visible light when energy is absorbed as a result of the incidence of X-rays, light waves, and electrons.
What is fluorescence?When a substance generates electromagnetic waves inside the longer wavelength range and makes them visible to the human eye, it is a fascinating occurrence. Let's first define fluorescence in order to comprehend this. This allows the substance to gently transition from the partly excited state to the ground state. Fluorescence is the term for this phenomena.
Detection limit = 3 × noise / signal to noise ratio
Detection limit = 3× 75 pM / 5 = 15 pM
Source power = (noise / desired detection limit)² × current source power
Source power = (15 pM / 75 pM)² ×500 pM
= 0.36 ×500 pM
= 180 pM
Source power= 180 pM - 500 pM =
=-320 pM
Therefore, -320 pM, we need to increase the source power.
To know more about fluorescence, here:
https://brainly.com/question/14742655
#SPJ1
Which of the following compounds are the same?
Compound 1: 1.10 g of H and 8.90 g of O.
Compound 2: 4.95 g of H and 40.05 g of O.
Compound 3: 2.10 g of H and 32.90 g of O.
Compound 4: 4.70 g of H and 60.30 g of O
A. Compounds 1 and 4
B. Compounds 2 and 4
C. Compounds 2 and 3
D. Compounds 1 and 2
Option C, compounds 2 and 3 are the compounds which are the same.
mole = mass/molar mass, mole of hydrogen = 2.10/1 = 2.10 and mole of oxygen = 32.90/15.99 = 2.10. Thus, 2.10g of H = 32.90g of O.
What is Molar mass?
Molar mass is the mass of one mole of a substance, typically measured in grams per mole. It is calculated by summing the atomic weights of all the atoms in a chemical compound.
It is important in determining the number of moles in a given mass of a substance, and in understanding the properties of a substance at a molecular level. It is also used in stoichiometry calculations to determine the amounts of reactants and products in chemical reactions.
To learn more about Molar mass, visit: https://brainly.com/question/21334167
#SPJ1
The photoelectron spectrum for the element nitrogen is represented above. Which of the following best explains how the spectrum is consistent with the electron shell model of the atom?
The spectrum is consistent with the electron shell model of the atom because it shows that electrons are being released from each of the energy levels of the atom in order from lowest to highest.
What is the electron ?
The electron is a subatomic particle with a negative electrical charge. It is the smallest and most fundamental particle of the atom. Electrons are found in the electron cloud of the atom, which is the region outside the nucleus. Electrons have a mass of about 9.10938356 x 10^-31 kilograms, which is about 1/1836 that of the proton. Electrons are the primary carriers of electricity in solids, and they are involved in all chemical reactions. Electrons occupy the outermost shell of the atom and are responsible for the chemical properties of the element. They determine the chemical behavior of an atom and are the main component of electrical circuits. Electrons are also responsible for the formation of ionic bonds, which are the basis of life and all other chemical processes.
To learn more about electron
https://brainly.com/question/28329307
#SPJ4
For Structure A what are the formal charges on atoms:
1 , 2 , and 3 ?
For Structure B what are the formal charges on atoms:
1 , 2 , and 3 ?
For Structure C what are the formal charges on atoms:
1 , 2 , and 3 ?
A formal charge is a hypothetical charge that is assigned to an individual atom in a polyatomic molecule.
The formal charge is the charge to an individual atom in a polyatomic molecule or the ion. The example of the formal charge is given below as:
Formal charge in carbon dioxide , CO₂ :
The formal charge = valence electrons - non bonding electrons - bonding
electron/2
Formal charge of Carbon atom = 4 - 0 - 8/2
= 0
Formal charge on oxygen atom 1 = 6 - 6
= 0
Formal charge on oxygen atom 2 = 4 - 4
= 0
The given question is incomplete, I gave general answer according to my knowledge.
To learn more about formal charge here
https://brainly.com/question/11723212
#SPJ4
