Answer:
4.1843 x 10²² atoms Pt
Explanation:
To find the number of platinum (Pt) atoms, you need to (1) convert grams to moles (using the atomic mass) and then (2) convert moles to atoms (using Avogadro's number). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 5 sig figs to match the amount of sig figs in the given value (13.555).
(Step 1)
Atomic Mass (Pt): 195.08 g/mol
13.555 grams Pt 1 mole
--------------------------- x ------------------------- = 0.069484 moles Pt
195.08 grams
(Step 2)
Avogadro's Number:
6.022 x 10²³ atoms = 1 mole
0.069484 moles Pt 6.022 x 10²³ atoms
--------------------------------- x --------------------------------- = 4.1843 x 10²² atoms Pt
1 mole
The subatomic particles of an element are very important to that element and affect an element each in it's own way.
What are the three subatomic particles of an atom and what are their respective charges? If I wanted to figure out how to find the number of nuetrons, how could I use the atomic mass to find it?
Answer:
Explanation:
The three subatomic particles: protons with a positive charge, neutrons with a neutral charge, and electrons with a negative charge. The atomic mass can be found by adding the amount of protons and the amount of neutrons together. Therefore, you can find the number of neutrons in an atom by subtracting the number of protons from the atomic mass.
ii) Which arrow shows the direction of the force of the spring on the ball? Tick the correct box
Answer:
b
Explanation:
i just randomly give the answer because of the reason you didn't gave the example
How had the New Deal given the government an advantage in preparing for war?
A. The New Deal focused on creating jobs in the weapons industry.
B. Farmers had been encouraged to plant more crops, making more food
C. The government owned a lot of the peoples' debt, and could ask for favors.
D. The government had become closely involved in social and economic affairs
I need help with this please
Compounds of bromine that conduct electricity are ionic compounds whereas compounds of bromine that never conduct electricity are covalent in nature.
What are compounds?Compounds are substances which are composed of two or more elements chemically combined together.
Compounds may be covalent in nature or ionic in nature depending on the nature of the type of bonds present in the compounds.
Compounds that are formed by compounds with large electronegativity differences contain ionic bonds, as these elements form ions.
Ionic compounds conduct electricity in either molten or solution form. Examples of ionic compounds are sodium bromide, calcium bromide, etc.
Compounds that are formed by compounds with very small or no electronegativity differences contain covalent bonds, and these elements form molecules.
Covalent compounds do not conduct electricity in either molten or solution form. Examples of covalent compounds are hydrogen bromide, bromine trifluoride, etc.
In conclusion, bromide compounds may be covalent or ionic.
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How fast do Plate Boundaries move and how do scientists figure out how fast they go and which directions do they go?
Plate boundaries can move as fast as 1 cm to over 10 cm per year and the scientists figure out how fast they go and which directions do they go through the use of GPS.
What is GPS?This is referred to as Global positioning system and it contains different types of satellites which makes it easier to determine the ground position of different types of objects such as plate boundaries, rocks etc.
This system sends highly accurate navigation pulses to users thereby ensuring that the exact position is gotten and in the case of the plate tectonics people use it to determine the extent of movement within a given period of time.
Plate tectonics move slowly which varies and is usually between 1 cm to over 10 cm per year thereby making it the most appropriate choice.
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What is the job of a scientist why do scientits need government funding
Answer:
1. A scientist conducts and gathers research to gain knowledge in a particular area.
2. Many of the worlds problems include resources, energy, health, environment, climate, transportation, communication, etc. and will require solutions from science and engineering.
22. Which of the following hydrated salts is used to remove permanent hardness in water? A. CaSO4.H₂O B. MgSO4.7H₂O C. Na₂CO3.10H₂O D. Na₂SO4.10H₂O
The hydrated salts which is used to remove permanent hardness in water is Na₂CO3.10H₂O.
The presence of soluble bicarbonates, chlorides, and sulphates of calcium and magnesium is what causes water to be hard. Hard water is water that does not foam up with soap.There are several minerals in hard water. It is created when water seeps through chalk and limestone formations, which are composed of magnesium and calcium carbonates. It cannot be used for laundry since it does not produce a lather when soap is added. Presence of soluble magnesium and calcium salts in the form of chlorides and sulphides in water as permanent hardness since boiling cannot dissolve this hardness.By adding washing soda to the water, we can soften it up. When washing soda combines with the sulphide and chloride compounds of calcium and magnesium, insoluble carbonates are created, resulting in the transformation of hard water into soft water.Therefore, Na₂CO3.10H₂O is used to remove permanent hardness in water.
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Calculate the amount of copper (in moles) in a 35.8-g pure copper sheet.
Express your answer numerically in moles.
The amount of copper (in moles) in a 35.8-g pure copper sheet = 0.564 moles.
Given:
Mass = 35.8 g
Molar mass of copper = 63.5 g/mol
It home contains copper, a lovely and practical metallic element, both in its pure form and as chemical compounds. The International System of Units uses the mole (symbol: mol) as the unit of material quantity (SI). The amount of a substance determines how many elementary entities of that substance are present in an object or sample.
Moles can be calculated using the formula:
Number of moles = Mass/ Molar mass
Putting values in above equation, we get
Number of moles = 35.8 g / 63.5 g/mol
Number of moles = 0.564 moles
So, The amount of copper (in moles) in a 35.8-g pure copper sheet = 0.564 moles.
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7. Water has a low viscosity (thickness). How might the movement of other dyes change if a fluid with a higher viscosity is used?
The movement of other dyes greatly change if a fluid with a higher viscosity is used because viscosity controls the movement of particles.
How might the movement of other dyes change if a fluid with a higher viscosity is used?The movement of other dyes change if a fluid with a higher viscosity is used because viscosity decides the movement of materials. Viscosity is defined as a measure of resistance of a fluid to flow. Those liquids that have higher viscosity having slower movement of particles while on the other hand, those liquids that have lower viscosity having faster movement of particles. The dyes present in the liquid moves slower due to higher viscosity of the liquid whereas dyes present in the liquid moves faster due to less viscosity of the liquid.
So we can conclude that the movement of other dyes greatly change if a fluid with a higher viscosity is used because viscosity controls the movement of particles.
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Predict what kind of chemical bond forms between nitrogen and hydrogen atoms in
ammonia (NH3).
Answer:
Nitrogen atoms and hydrogen atoms in ammonia are held together by covalent bonds.
Explanation:
A 29.1 g sample of solid CO2 (dry ice) is added to a container at a temperature of 100 K with a volume of 3.4 L.
If the container is evacuated (all of the gas removed), sealed, and then allowed to warm to room temperature T = 298 K so that all of the solid CO2 is converted to a gas, what is the pressure inside the container?
Answer:
sugma
Explanation
breaking bad
how does the doppler effect explain why a seiren pitch increases as it approches you
A siren pitch increases as it approaches us, as according to Doppler effect pitch depends on the frequency of the sound wave. A high frequency corresponds to a high pitch, so when the siren approaches us the observed frequency increases and our ears hears a higher pitch as siren produces waves of constant frequency as it approaches us .
We know,
Doppler effect is the apparent change in frequency of a wave when the observer and the source of the wave move relative to each other.
According to Doppler effect, frequency of sound, light or other waves increases due to relative motion between wave source and observer. The frequency increases if the source and the observer move towards each other and vice-versa.
Since the observed frequency increases when the siren produced waves of constant frequency our ears hears a higher pitch as it approaches us.
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Combustion analysis of an unknown compound containing only carbon and hydrogen produced 4.554 g of CO2 and 2.322 g of H2O. What is the empirical formula of the compound?
The empirical formula is C₂H₅.
Oxygen is used to burn a chemical during a combustion reaction. The products will be CO₂ and H₂O if the chemical comprises C and H. The products are the same if the compound additionally contains o, but less external O₂ is required for combustion. The same methodology is used to get the empirical formula: we measure the amount of CO and H₂O produced and work backward to determine the moles of C and H (and O by difference if that is the case).
The products are 4.554 g of CO₂ and 2.332 g of H₂O :
The amount of C in moles is:
= 4.554 g CO₂ × ( 1 mol CO₂ / 44.01 g ) × ( 1 mol C / 1 mol CO₂ )
= 0.1035 mol C
Similarly,
2.332 g H₂O × ( 1 mol H₂O / 18.02 g ) × ( 2 mol H / 1 mol H₂O ) = 0.2578 H
From the combustion of the compound, we obtained all the carbon and hydrogen. Hence, the ratios are:
C : ( 0.1035 / 0.1035 ) = 1
H : (0.2578 / 0.1035 ) = 2.49
Therefore, CH₂.₅
When we multiply CH₂.₅ by 2, we get C₂H₅.
The empirical formula of the compound is C₂H₅.
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Which of the following is an inner transition element?
Group of answer choices
None of these
Ti
Rf
All of these
Th
Option E) Th is correct answer. Thorium (Th) is inner transition element.
The components that make up the f-block are those where the 4f and 5f orbitals gradually fill up. Although they are officially members of group 3, these elements are displayed separately in the f-block of the periodic table. Inner transition elements are another name for the f-constituent block's parts.Lanthanoids and actinoids are the names for the two series of inner transition elements that are 4f and 5f series, respectively. The inner transition elements U, Th, and Pa are excellent nuclear energy sources.The inner transition elements' electronic configuration is 4f1-14 5d0-16 s².Due to their uniform size and outer shell design, elements in a series would all have comparable qualities, making it difficult to distinguish them from one another.Hence, thorium is inner transition element.
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What is the correct conversion factor and the answer?
Please with this on the image
Answer:
neutron
electron
13
atomic number/proton number
(answers are in order)
An atom has a charge of +1 in its nucleus. Which statement must be true for this atom to have no net charge?
There is one neutral neutron in the nucleus as well.
There is one negatively charged electron outside the nucleus.
There is one negatively charged electron in the nucleus.
The one positive proton has no influence on the overall charge of the atom.
The statement that is true regarding the atom that has a charge of +1 in its nucleus for it to have no net charge is that there is one negatively charged electron outside the nucleus (option B).
How is net charge formed?An atom is made up of three subatomic particles namely;
Proton; which is the positively charged particleElectron; which is the negatively charged particleNeutronThe number of protons and electrons in the atom is responsible for the net charge of that atom. For example, if there are more protons than electrons, the atom will be positively charged.
However, according to this question, an atom has a charge of +1 in its nucleus. This means that for this atom to have no net charge i.e. 0, there must also be one electron orbiting outside the nucleus.
Therefore, the statement that is true regarding the atom that has a charge of +1 in its nucleus for it to have no net charge is that there is one negatively charged electron outside the nucleus.
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How many MOLES of sulfur
hexafluoride are present in
8.50x1022 molecules of this
compound ?
are both of these answers correct?
The one that will increase the rate of reaction can be adding a catalyst, proper reactant concentration, pH, temperature, etc. And the exothermic reaction is the one that gives off energy to the environment. The correct option for question 1 is E and for 2 is E.
What is rate of reaction?The reaction rate or rate of reaction is the rate at which a chemical reaction occurs, defined as proportional to the increase in product concentration per unit time and the decrease in reactant concentration per unit time. The rates of reaction can differ tremendously.
Adding a catalyst, proper reactant concentration, pH, temperature, and so on can all increase the rate of the reaction.
The exothermic reaction is the one that usually releases energy into the environment.
Thus, the correct options for question 1 and 2 is E and E respectively.
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Carrie measured mass and another property, X, of three pure samples of the same compound. She recorded her data in the table.
Which of the following best describes property X?
The statement which best describes property X is: C. X is an extensive property because it varies directly with the size of the sample.
What is a physical property?A physical property can be defined as the properties of an object that can be measured and observed without changing (altering) the chemical composition of the object.
The types of physical property.In Chemistry, there are two (2) main types of physical property and these include the following:
Extensive property: it is a property that changes when the size of an object changes.Intensive property: it is a property that remains the same regardless of the change in the size of an object.In this context, we can reasonably infer and logically deduce that X is an extensive property because it varies (changes) directly with the size (mass) of the sample.
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Complete Question:
Carrie measured mass and another property, X, of three pure samples of the same compound. She recorded her data in the table. Which of the following best describes property X?
A. X is an intensive property because it does not vary with the size of the sample.
B. X is an extensive property because it does not vary with the size of the sample.
C. X is an extensive property because it varies directly with the size of the sample.
D. X is an intensive property because it varies directly with the size of the sample.
how is phenol and ethanal distinguish
Alcohol is almost neutral in nature, whereas phenol has a weak acidic nature. The reaction with neutral FeCl3 distinguishes between ethanol and phenol.
Why phenol is acidic but ethanol is neutral?A phenoxide ion, or similar particle, is created when a phenol molecule loses its hydrogen ion. Since this phenoxide ion is resonance stabilized, its nature is acidic. However, when an ethanol molecule loses its hydrogen ion, it creates an ion.
Distinguish between alcohol and phenol and ethers :A saturated carbon atom bonds with a hydroxyl (-OH) group to produce alcohol. When the -OH group is substituted for a hydrogen atom in a benzene molecule, phenol is created. When an oxygen atom is joined to two alkyl or aryl groups, ether is created.
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Which of the following is true about the number of subatomic particles of the element Argon (Ar)?
a. It has 18 protons, 18 electrons, and 22 neutrons.
b. It has 18 protons, 18 electrons, and 42 neutrons.
c.It has 22 protons, 22 electrons, and 18 neutrons.
d. It has 22 protons, 22 electrons, and 22 neutrons.
Answer:
A
Explanation:
A student decided not to reweigh his Erlenmeyer flask throughout the calibration lab. After a given trial, he shook leftover water out of his Erlenmeyer flask by wrist action and assumed the mass of his flask was constant. Then, he reused the flask for the next trial and so on. Given this information, how might this affect the student's calibration graph (i.e., explain what the graph might look like)? Is this an example of random or systematic error? Why? Since the buret calibration graph is used to adjust apparent delivered volumes in future labs, how will this student's laziness affect his future data?
The laziness of student can affect calibration in many ways. Such situations leads to errors in the experiment.
The given case could lead to standard deviations that are so high that they endanger the calibration.Different operators may generate measurements with biases that vary in sign and magnitude.It can lead to incorrect plotting of graph.The mistake done by student is an example of systematic error. Systematic Error: Incorrectly calibrated or improperly used measuring equipment is typically the root cause of systematic error. However, errors can enter your experiment from different means. As student doesn't reweigh his Erlenmeyer flask throughout the calibration lab so this comes under improper handling of equipment. therefore, it is systematic error. Student's laziness will affect his data which he will use as reference in future for further experiments.There will be huge error in calibration graph which will lead to incorrect adjustments of volumes in labs.
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Determine the Reaction order, the Rate constant, k, and the units of k.
[A] (M) Ln [A] (M) t (s) 1/t (s)
0.850 -0.165 00.0 0.000
0.661 -0.414 30.0 0.0333
0.439 -0.823 60.0 0.0166
0.316 -1.15 90. 0 0.0111
Units of k:______
The Reaction order is first order, K is 0.0111 and Units of k is Sec⁻¹.
Reaction order = first order reaction
The Rate is constant,
equation ln[A] = -kt + ln[A]
= -0.165 = -K(0.000) + ( -0.165 )
k = o
K = 0.0333
k = 0.01660.0111
k =
Units of k. = Sec⁻¹
The rate constant, or the specific fee regular, is the proportionality steady inside the equation that expresses the connection between the charge of a chemical reaction and the concentrations of the reacting materials.
The rate constant, ok, is a proportionality constant that shows the relationship between the molar attention of reactants and the price of a chemical reaction. The rate regular can be found experimentally, the use of the molar concentrations of the reactants and the order of response.
The constant which defines the connection between the molar attention of the reactants and the charge of the chemical response is referred to as the fee regular. The rate steady is symbolized as okay.
Unit of rate constant = sec−1. The unit of fee consistent for a primary-order reaction is sec−1. For first-order reactions,
⇒equation ln[A] = -kt + ln[A]
zero is the same as the equation of a direct line (y = MX + c) with a -ve slope.
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Oxygen gas reacts with solid carbon to produce carbon dioxide gas . Write a balanced chemical equation for this reaction.
The balanced chemical equation is O₂ (g) + C (s) → CO₂ (g).
The chemical element carbon has the atomic number six and the letter C assigned to it. It has a tetravalent atom, which means that four of its electrons can be used to create covalent chemical bonds. It is nonmetallic.
When carbon combines with oxygen gas to generate carbon dioxide gas, the balanced equation is as follows:
O₂ (g) + C (s) → CO₂ (g)
While oxygen is a gas and has the chemical symbol O, carbon is a solid element with the symbol C.
Carbon dioxide gas is created when carbon combines with oxygen gas as follows:
O₂ (g) + C (s) → CO₂ (g)
According to the equation above, each element in the equation has an equal amount of atoms, hence the equation is said to be balanced.
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A 3 column table with 7 rows. The first column is labeled color with entries red, orange, yellow to white, white, white to blue, blue, blue. The second column is labeled surface temperature in Kelvin with entries under 3500, 3500 to 5000, 5000 to 6000, 6000 to 7500, 7500 to 11000, 11000 to 25000, greater than 25000. The last column is labeled average mass in solar masses with entries, 0.3, 0.8, 1.1, 1.7, 3.2, 18, 60.
Arcturus is a star whose surface temperature is 4290 K.
What is most likely the color of Arcturus?
What is most likely the mass of Arcturus?
about
solar masses
From the table as we can see it ;
The color of the star is orangeThe average mass of the star is 0.8What is a table?A table is often used for the representation of information. We know that a table has to have columns. Each of the columns could be used to show particular variable. Now we have the temperature, the color and the mass of different stars showed on the table as we can see it in the question.
We now have the assignment to find the color and mass of the start that corresponds to a temperature of about 4290 K hence we have to look intently at the table.
Color of the star - Orange
Average Mass of the star - 0.8
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Answer: What is most likely the color of Arcturus? ORANGE
What is most likely the mass of Arcturus? about 0.8 solar masses
Explanation: just did the assignment
How many grams of CCl4 are needed to make a 1.20 m solution in 450g of octane?
There 83.2g of CCl4 are needed to make a 1.20 m solution in 450g of octane.
An octane score, or octane wide variety, is a popular measure of a gasoline's potential to face up to compression in an internal combustion engine without detonating. The higher the octane variety, the greater compression the gas can withstand before detonating. Octane rating is the measure of a fuel's ability to face up to knocking or pinging all through combustion, as a result of the air and fuel combination detonating prematurely in the engine.
Octane's legs are made from platinum, stated by using Octane whilst you reach Platinum IV in ranked announcing, Platinum rank to suit my legs Octane will be addicted to his Stim, together with his regular twitching within the in-game lobby and his use of the stim without apparent usage in trailers and teasers. considering Octane was envisioned with a mask, there's not anything beneath there that can make exceptional faces. Parra explained that because of this, he could have a clean expression for the whole thing.
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Identify the number of significant figures in the examples below. Use numbers, not words, to fill in the blanks.
The significant figure in the numbers are as follows:
1.06 s has 3 significant figures5003 mL has 4 significant figures10890 kg has 5 significant figures50 students has 1 significant figures0.00001 m has 1 significant figures100.0 cm² has 1 significant figures0.00800 s has 1 significant figuresWhat are significant figures?Significant figures refers to digits which are non-zeroes found in a given number. Also, if zeroes are found between non-zero digits, the zeroes are counted as significant numbers.
The number of non-zero digits gives the number of significant figures in a number.
Significant figures are used in approximating values to determine to how many places the digits in a number are significant.
Considering the given numbers:
A) 1.06 s has 3 sig figs
B) 5003 mL has 4 sig figs
C) 10890 kg has 4 sig figs
D) 50 students has 1 sig figs
E) 0.00001 m has 1 sig figs
F) 100.0 cm² has 1 sig figs
G) 0.00800 s has 1 sig figs
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matter can change phase by changing the amount of?
Answer:
Explanation:
Matter can change phase by changing the amount of Energy
How many atoms or ions of each element are in 174.2 g of the following substances? (a) BaSO4
(b) Mg3(PO4)2
c) O2
d0 KBr
The number of atoms of each elements that are in 174.2g of the following substances are:
(a) [tex]BaSO_{4}[/tex]⁴= 4.49 × 10²³ atoms
(b) [tex]Mg_{3} (PO_{4} )_{2}[/tex] = 4.0 × 10²³ atoms
(c) [tex]O_{2}[/tex] = 65.5 × 10²³ atoms
(d) KBr = 8.81 × 10²³ atoms
Calculation of number of atomsFor the compound [tex]BaSO_{4}[/tex];
The molar mass of [tex]BaSO_{4}[/tex]= 233.38 g/mol
According to Avogadro's number: 6.02x1023 atoms = 1 mol
Therefore, 233.38 g of [tex]BaSO_{4}[/tex]= 6.02x10²³ atoms
174.2 g of [tex]BaSO_{4}[/tex]= x atoms
Make x atoms the subject of formula,
X atoms = 174.2 × 6.02x10²³/ 233.38
X atoms= 1048.684 × 10²³/233.38
X atoms = 4.49 × 10²³ atoms
For the compound[tex]Mg_{3} (PO_{4} )_{2}[/tex] ;The molar mass of [tex]Mg_{3} (PO_{4} )_{2}[/tex]= 262.855 g/mol
According to Avogadro's number:
6.02x1023 atoms = 1 mol
Therefore, 262.855 g of [tex]Mg_{3} (PO_{4} )_{2}[/tex] = 6.02x10²³ atoms
174.2 g of [tex]Mg_{3} (PO_{4} )_{2}[/tex] = x atoms
Make x atoms the subject of formula,
X atoms = 174.2 × 6.02x10²³/ 262.855
X atoms= 1048.684 × 10²³/262.855
X atoms = 4.0 × 10²³ atoms
For the compound [tex]O_{2}[/tex];
The molar mass of [tex]O_{2}[/tex]= 16 g/mol
According to Avogadro's number:
6.02x1023 atoms = 1 mol
Therefore, 16 g of [tex]O_{2}[/tex]= 6.02x10²³ atoms
174.2 g of [tex]O_{2}[/tex] = x atoms
Make x atoms the subject of formula,
X atoms = 174.2 × 6.02x10²³/ 16
X atoms= 1048.684 × 10²³/16
X atoms = 65.5 × 10²³ atoms
For the compound KBr;
The molar mass of KBr = 119.002 g/mol
According to Avogadro's number:6.02x1023 atoms = 1 mol
Therefore, 119.002 g of KBr = 6.02x10²³ atoms
174.2 g of KBr = x atoms
Make x atoms the subject of formula,
X atoms = 174.2 × 6.02x10²³/ 119.002 g
X atoms= 1048.684 × 10²³/ 119.002 g
X atoms = 8.81 × 10²³ atoms.
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