The addition of an aqueous solution with a pH less than 7 to sodium bicarbonate causes bubbling is chemical change. I'm frying an egg is chemical. The reduction in vapor pressure caused by the addition of salt to a liquid is physical change.
Combination of yellow and blue paint to create a green paint is chemical. Formation of solid after reagent combination is chemical. Crystal formation upon solution formation is physical. Melting point is a physical property, as it refers to the temperature at which a substance changes from a solid to a liquid state. The addition of an aqueous solution with a pH less than 7 to sodium bicarbonate causes bubbling.. This is a chemical change as a new substance is formed (carbon dioxide gas) and the bubbling is due to the release of CO2 gas.Cooking an egg. This is a chemical change as the proteins in the egg change structure and form new compounds The lowering of vapor pressure after salt is added to a liquid, this is a physical change because it is a change in the physical properties of the liquid. Combination of yellow and blue paint to create a green paint is a chemical change.
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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.
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Define hydrogen bonding with example?
Explanation:
Hydrogen bonding is a type of noncovalent interaction between molecules or within a molecule in which a hydrogen atom is attracted to a highly electronegative atom, such as nitrogen, oxygen, or fluorine. The bond is formed between the partial positive charge on the hydrogen atom and the partial negative charge on the other atom.
An example of hydrogen bonding is the interaction between the hydrogen atoms in the molecule of water, H2O. In the water molecule, each hydrogen atom is bonded to an oxygen atom. The oxygen atom is more electronegative than hydrogen, which means it has a stronger pull on the electrons in the bond. This creates a partial negative charge on the oxygen atom, and a partial positive charge on the hydrogen atoms. These partial charges allow for the formation of hydrogen bonds between the hydrogen atoms of one water molecule and the oxygen atoms of another water molecule. This is what gives water its unique properties, such as high boiling point, high surface tension, and high heat of vaporization.
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.
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HELP ME OUT PLEASE!!!!!!
Instead of Fossil Fuels to generate power, nuclear energy uses ___________
Oil
Coal
Uranium
Gas
Instead of Fossil Fuels to generate power, nuclear energy uses Uranium. Therefore, among all the given options, the correct option is option C.
What is Fossil Fuels?Any of a group of hydrocarbon-containing compounds of biological origin that are found in the Earth's crust and may be utilized as a source of energy are known as fossil fuels.
Coal, petroleum, oil and gas, oil shales, bitumen, tar sands, other heavy oils are examples of fossil fuels. Even before Devonian Period (419.2 to 358.9 million years ago), the majority of carbonaceous material came from algae and bacteria, but the majority of carbonaceous material that formed during and after that time came from plants. Instead of Fossil Fuels to generate power, nuclear energy uses Uranium.
Therefore, among all the given options, the correct option is option C.
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a student measures the volume of a gas sample at several different temperatures. the results are tabulated as follows:
a. The temperature of a gas is directly proportional to its volume
c. The temperature-to-volume ratio of a gas is constant. are the correct options.
Determine the temperature to volume ratios using three significant figures:
298 / 4.55 = 65.5
315 / 4.81 = 65.5
325 / 4.96 = 65.5
These figures then demonstrate a constant temperature-to-volume ratio, which may be represented mathematically as follows:
Volume x Temperature has a straight proportional fluctuation of constant (the volume increases in a constant proportion to the increase of the temperature).
A gas's volume and temperature are inversely proportional. A gas always has the same ratio of temperature to volume. The data in the table show that volume increases at the same rate as temperature.
complete question:A student measures the volume of a gas sample at several different temperatures. The results are tabulated as follows:Temperature of gas (K) Volume of gas (L)
298 4.55
315 4.81
325 4.96
335 Formulate a tentative law from the measurements.Check all that apply.
a. The temperature of a gas is directly proportional to its volume.
b. The temperature of a gas is inversely proportional to its volume.
c. The temperature-to-volume ratio of a gas is constant.
d. The temperature-to-volume ratio of a gas isn't constant.
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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.
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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)
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A prescription medication requires 8.00 mg per kg of body weight. Express your answer to three significant figures.
The amount of medication required in grams per pound of body weight is 0.00363 g/lb.
What is the conversion factor between pounds and kilograms?The conversion factor between pounds and kilograms is given below:
1 kg = 2.20462 lb
The data given is as follows:
The prescription medication requirement = 8.00 mg/kg
We use the conversion factor to convert the given amount to grams per pound of body weight.
1 kg = 2.20462 lb
1 g = 1000 mg
Hence;
8.00 mg = 8.00 * 1 g/1000 mg
8.00 mg = 0.008 g
The given amount of medication required in grams per pound of body weight = 0.008 g / 2.20462 lb
medication required in grams per pound of body weight = 0.00363 g/lb
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Complete question:
A prescription medication requires 5.98 mg per kg of body weight. Convert this quantity to the number of grams required per pound of body weight. Express your answer to three significant figures.
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.
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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.
When using gloves as personal protective equipment, which of the following procedures should be followed? A: Wear gloves of a material known to be resistant to permeation by the substances in use B: Remove gloves before handling objects such as doorknobs, telephones, pens, and computer keyboards C: Decontaminate or wash gloves before removing them D: Inspect gloves for small holes or tears before use E: Replace gloves periodically, depending on the frequency of use F: All of the above 13. Latex gloves A: May be reused as long as they are clean B: May be reused only if they have not been permeated C: Should never be reused
F: All of the above. When using gloves as personal protective equipment, it is important to follow all of the procedures listed:
A) Wear gloves of a material known to be resistant to permeation by the substances in use,
B) Remove gloves before handling objects such as doorknobs, telephones, pens, and computer keyboards,
C) Decontaminate or wash gloves before removing them,
D) Inspect gloves for small holes or tears before use,
E) Replace gloves periodically, depending on the frequency of use.C: Should never be reused. Latex gloves should never be reused as they may have been contaminated and may not provide sufficient protection. It is recommended that gloves are changed frequently to ensure safety.
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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
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Density is a physical property that relates the mass of a substance to its volume.
Calculate the density, in g/mL, of a liquid that has a mass of 0.125 g and a volume of 0.000225 L.
density:
Calculate the volume in milliliters of a 4.91-g sample of a solid with a density of 3.41 g/mL.
volume:
Calculate the mass of a 0.267-mL sample of a liquid with a density of 0.660 g/mL.
mass:
answer:
3004838
Explanation:
3+939$
Select the equation that has the following mole ratio:
2:6:2:3
The chemical equation which has the given mole ratio is 2 Al + 6 HCl → 2 AlCl₃ + 3 H₂.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
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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.
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What is the volume, in milliliters, of 6.48 g
of acetone?
Answer:Good question!! I’ll try to help you the best I can!
First off, you have to know that acetone has a density of 0.7857 g/cm^2
You also need to know that 1mL = 1cm^3
Once you know that, the rest is pretty easy you’ll see! The next step is a cross product to find out how many cm^2 are in 6.72g :
0.7857 g → 1 cm^3
6.72 g cm^3
(1 * 6.72) ÷ 0.7857 = x
6.72 ÷ 0.7857 =x
8.55
Which means that for 6.72g of acetone, you have a volume of about 8.55cm^3.
Finally, since we’ve established in the beginning that 1cm³ = 1mL, it’s easy to answer your question!
The volume, in millilitres, of 6.72g of acetone is about : 8.55mL
There you go, I really hope this helped, if there’s anything just let me know!
Explanation:
science
describe the sexual reproductive of flowering plants like the gumamela flower by
creating your own story
Answer:
the organs of sexual reproduction is the flower. male gametes is found in pollen grains and produced in the anthers of the flower. female gametes i found in ovules and produced inthe ovary of the flower.
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.
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which of the following compounds is a gas at room temperature? ch3ch2och2ch3 ch3ch2ch2ch2ch2ch3 h2o ch4
[tex]ch3ch3ch3[/tex] is the one compounds is a gas at room temperature.
What is the ideal room temperature?
Generally speaking, room temperature refers to a range of air temperatures that people favour indoors. When someone is dressed in regular indoor attire, they feel at ease. Depending on humidity, air circulation, and other factors, human comfort can go beyond this range.
Around 20°C, or 68° Fahrenheit, is usually the standard room temperature. Though it's crucial to keep in mind that different rooms will need to be heated to different temperatures, this is a good ambient temperature to aim for.
Store at 15°-25°C (59°-77°F) above room temperature. Ambient temperature: Keep your items at the temperature outside. Considering the vast range of ambient temperatures, this word is not commonly used.
Molecules with the stronger intermolecular forces are pulled tightly together to form solid at higher temperatures and that's why the freezing point is higher.
Also, molecules with the stronger intermolecular force have greater interaction between the molecules and thus on heating do not boil easily and have high boiling point also.
Thus, melting point and boiling point increases with increase in number of carbon atoms and also increase in intermolecular forces (like hydrogen bonding, if present).
Thus, the compound which is gas at room temperature is because it has least number of carbon atoms and absence of hydrogen bonding.
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Which of the following options correctly reflect the relationship between SI units and units containing decimal prefixes? Select all that apply. Check all that apply. O 1 millimole contains 1000 moles. 1nm-10 m; hence there are 10° nm in 1 m. O There are 1000 g in one kg. O There are 10 microseconds in 1 second.
There are 1000 g in one kg. It is a correctly reflect the relationship between SI units and units containing decimal prefixes.
What is meant by SI units?
Other coherent derived units may be expressed using a combination of the seven base units and the 22 coherent derived units with unique names and symbols.The SI offers twenty-four prefixes that, when applied to the name and symbol of a coherent unit or units, produce twenty-four additional (non-coherent) SI units for the same quantity since the sizes of coherent units will be convenient for some purposes but not for others.The coherent unit's decimal multiples and submultiples are always the non-coherent units.The SI is designed to be a dynamic system; new units and prefixes are added, and unit definitions are changed through international agreement as measurement technology develops and measurement accuracy rises.To learn more about SI units refer to
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Which of the following descriptions and/or equations best represents the enthalpy change of a system? There may be more than one correct answer.
A. The heat absorbed or released during a phase change or chemical reaction at constant pressure
B. The work done on or by a phase change or chemical reaction at constant pressure
C. deltaH = deltaE + PdeltaV
D. deltaE = q + w
E. H= E + PV
The heat absorbed or released during a phase shift or chemical reaction at constant pressure is what option a, in terms of equations, best describes the enthalpy change of a system.
Is the heat change in a system described by enthalpy?At constant pressure, a system's enthalpy (H) represents its heat capacity. Chemists often gauge how reactants transform into products by measuring changes in the enthalpy of chemical systems. The same thing as the enthalpy change, which is denoted by the symbol H, is the heat that a process at constant pressure absorbs or releases.A chemical reaction causes a change in the system's enthalpy, which is determined by the volume of the system's gas, its pressure, and its internal energy.The heat absorbed or released during a phase shift or chemical reaction at constant pressure is what option a, in terms of equations, best describes the enthalpy change of a system.To learn more about enthalpy change refer to:
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Which of the following compounds would not be considered highly polar?
alkenes
alkanes
ethers
Given that ether is a more polar solvent than n-alkanes, it is anticipated that it will be more competitive in interactions of the dipole-type and as a hydrogen-bond base.
What one of the following compounds best exemplifies polarity?When two atoms form a polar covalent connection, a pair of electrons are unequally divided between them due to the electro-negativities that differentiate them. The name "polar covalent compounds" refers to these substances. An illustration of this is the electro-negativities of HCl, where each is different.HCl is a polar molecule because of the significant difference in electronegativity between the H and Cl atoms.Given that ether is a more polar solvent than n-alkanes, it is anticipated that it will be more competitive in interactions of the dipole-type and as a hydrogen-bond base.To learn more about polar solvent refer to:
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e) suppose you choose the initial masses so that both reactions produce pcl 3. explain how both of these chemical reactions obey the law of definite proportions, even though they produce different numbers of moles of the product. justify your answer with calculations.
The law of definite proportions states that regardless of the amount of reactants used, a chemical reaction will always produce the same proportion of products. In this case, both reactions will produce the same mole ratio of PCL3 (1:1) even though they produce different numbers of moles of the product. To demonstrate this, let's take a look at the first reaction:
Reaction 1:
2HCl + Ca3(PO4)2 → 2CaCl2 + PCl3
2 moles of HCl + 1 mole of Ca3(PO4)2 → 2 moles of CaCl2 + 1 mole of PCl3
Therefore, the mole ratio of PCL3 is 1:1.
Now let's look at the second reaction:
Reaction 2:
HCl + P4O10 → PCl3 + H3PO4
1 mole of HCl + 2 moles of P4O10 → 1 mole of PCl3 + 2 moles of H3PO4
Once again, the mole ratio of PCL3 is still 1:1. Therefore, both of these chemical reactions obey the law of definite proportions.
What is definite proportions?
Definite proportions law states that a given compound always contains the same elements in the same proportions by mass. This law, also known as the law of constant composition.
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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.
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Please hurry
Which of these substances would likely
increase in ocean water when nearby
rivers flood?
J Carbonate
K Sulfate
L Potassium
M Nitrate
Answer:
M - Nitrate is likely to increase in ocean water when nearby rivers flood.
Explanation:
As the nitrogen compounds are carried into the ocean, the nitrogen can be used by phytoplankton and other marine organisms, which can lead to a bloom of these organisms. This in turn can lead to an increase in the concentration of nitrate in the ocean water.
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
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Question 10 of 35
The graph shows the change in temperature of a sample
of water in a closed system as thermal energy is added
over time.
Temperature (°C)
150°C
100°C.
50°C-
g
0°C-
-50°C
10
20 30 40 50
Time (min)
What happens to the temperature of the water when it begins to melt?
OA The temperature remains at 100°C until the change of state is
complete
B. The temperature continues to increase during the change of state
C. The temperature continues to decrease during the change of
state.
OD. The temperature remains at 0°C until the change of state is
complete.
Answer:
D. The temperature remains at 0°C until the change of state is complete.
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.
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Using the formula, 2n^2 to find the maximum number of electrons in an orbit (shells), identify the elements that have incomplete shells.
A. Helium (Z = 2)
B. Zinc (Z = 30)
C. Argon (Z = 18)
D. Neon (Z = 10)
The elements that have incomplete shells are Zinc (Z = 30), Argon (Z = 18).so, option (b) (c) is correct.
What is element ?
A crucial component of a whole. a simple substance that cannot be divided into smaller components or transformed into another substance is referred to as in chemistry. Atoms, which are made up of protons, neutrons, and electrons, are the building blocks of an element. One element has a fixed number of protons in each of its atoms.
What is shell?
An atom's outermost region, which surrounds the atomic nucleus, is known as the electron shell. It consists of a collection of atomic orbitals with the same value of the fundamental quantum number, n. One or more sublevels, or electron subshells, exist within electron shells.
Therefore, elements that have incomplete shells are Zinc (Z = 30), Argon (Z = 18).so, option (b) (c) is correct.
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Which of the following are square properties? Choose ALL that apply.
Four right angles.
Exactly one pair of parallel sides.
Diagonals are perpendicular.
Diagonals are congruent.
The properties of a square are;
Four right angles.Diagonals are perpendicular.Diagonals are congruent.What is a square?We know that a square is one of the types of the quadrilaterals that we have in mathematics. The implication of this is that the square would have four sides.
If the square has four sides then it is possible that we can be able to draw a diagonal that would run from one point to the other across the square and this can be said for all the quadrilaterals. This is how now know the square.
Hence, the square can be said to be a quadrilateral figure.
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