find the percent composition of lead in lead (II) nitrate. round to 2 significant figures.​

Answers

Answer 1

Answer/Explanation:

62.559%

mass of an element   X 100%

mass of the compound

Scientific Notation: 3.45 x 10^5

E Notation: 3.45e5


Related Questions

scientific notation, fill in the blank.

7.95x10^7 = [ ? ]x 10^6

Answers

Answer:

79.5

Explanation:

7.95x10^7 IS 79500000.

If you bring the decimal point left 6 more times it would be 79.500000

At about what temperature does the sample change phase? Justify your
answer based on the cooling curve shown above.
A student states, “When the alcohol sample was at a temperature of 500 K, all the particles were moving faster than any of the particles were moving at
400 K" Do you agree or disagree with this student's statement? Justify your
answer.

Answers

Money cuzzo it to crazy

which rock is the result of changes on the Earth's surface?

igneous rock
sedimentary rock
metamorphic rock

Answers

Answer:

metamorphic

Explanation:

when one rock changes another rock the rock that got changed is now metamorphic

Why do molecules change the speed? (SELECT ONE)

 Claim 1: Molecules speed up when energy is created and slow down when energy is destroyed.

 Claim 2: Molecules speed up when they get energy from other molecules and slow down when they give energy to other molecules.

Answers

Answer:

Molecules speed up when they get energy from other molecules and slow down when they give energy to other molecules.

Explanation:

We know from the first law of thermodynamics that energy can not be created nor destroyed.

However, according to the kinetic molecular theory, molecules collide frequently with each other. All molecules in a substance do not possess equal energy hence some molecules are more energetic than others.

When a more energetic molecule collides with a less energetic molecule, the more energetic molecule transfers energy to the less energetic molecule. The less energetic molecule speeds up while the molecule that collided with it slows down due to energy transfer from one molecule to another.

Density can be calculated by dividing an object's mass by its volume. If the mass of an object is 10 grams and its volume is 2 milliliters, what is its density?

Answers

Explanation:

mass =10g. volume=2ml. density=mass/volume = 10/2=5kg/m^3

Answer:

5 g/mL

Explanation:

So, if the mass is 10 g and the volume is 2 mL, the density equals...

10 g ÷ 2 mL = 5 g/mL

Which of the following equations represents the balanced equation for the reaction of iron and oxygen?

a)
4Fe + 3O2 → 2Fe2O3

b)
2Fe + O2 → Fe2O3

c)
3Fe + 3O2 → 2Fe2O3

d)
Fe + 3O2 → Fe2O3

Answers

Answer:

D is balanced. :)

Among the following equations the one that represents the balanced equation for the reaction of iron and oxygen is a.

4Fe + 3O₂ → 2Fe₂O₃

What is balancing of a reaction?

Balancing of a reaction is done according to the "Law of conservation of mass" and balancing helps in solving stoichiometry questions correctly as if we will not balance the reaction then the quantitative results in a particular question doesn't come correctly.

Balancing of a reaction helps in mole concept as well and it is one of the laws of chemical reactions as well.

Some examples of balanced chemical reactions are-

2Mg(s) + O₂(g) ⟶ 2MgO(g)

Ca(OH)₂ + H₃PO₄ → Ca₃(PO₄)₂ + H₂O

Therefore, Among the following equations the one that represents the balanced equation for the reaction of iron and oxygen is a.

4Fe + 3O₂ → 2Fe₂O₃

Learn more about Balancing of a reaction here:

https://brainly.com/question/14280002

#SPJ2

PLEEEASSEEEE HELPPPPP!!!!!Take some time to research a utility plant. If there is one in your area, you may even visit it.
Otherwise, look up a type of plant that produces energy - such as a nuclear power plant, a
hydroelectric plant, or a coal-burning plant. Find out what energy resources are brought into the
plant. Then find out what energy and what "waste" is produced by the plant. Describe how the
two Laws of Thermodynamics apply to what you find out in your research. Be thorough. You will
be using the information you gather to engage in a debate with your class about
thermodynamics.

Answers

Answer:

There are four laws of thermodynamics that define fundamental physical quantities (temperature, energy, and entropy) and that characterize thermodynamic systems at thermal equilibrium.

Explanation:

what element has three valence electrons in the second energy level.​

Answers

Answer:

Boron

Explanation:

Hope that helps

Answer:

Boron.

Explanation:

2 energy shells

1st energy she'll 2 electrons

2nd energy shell 3 electrons

Worth 20 points will mark you brainliest!

Answers

The one u clicked is the the right one

Describe the subatomic particles found in an atom, and
describe each one. Also, describe how they relate to each
other.




pls helpp <3

Answers

Hehehehe jekejeihdneje idiejejud jewel

1. What is the basic unit of structure and function in a living thing
called?
2. How did the invention of the microscope help scientists learn
more about living things?
3. Who was the first to discover cells?
4. Draw a timeline that shows the dates, discoveries, and
scientists involved in the development of the cell theory.
5. What are the four statements of the cell theory?
6. What are specialized cells? List three examples.
7. What are four similarities that all cells share?
8. List the cell part for each letter on the diagram below. What is
the function of each part?

Answers

A,C,D,C,B,D,A,A...............!:!:!:$:$:$:$:$:$$:$:$;$;$

If it takes 5 hours to produce 8.0 kg of alcohol, how any days will it take to consume 1000 kg of glucose?

Answers

It takes 21.3 days

Further explanation

Given

5 hr = 8 kg Alcohol

Required

Days to consume 1000 kg of glucose

Solution

Alcoholic fermentation⇒ glucose produces ethanol and carbon dioxide,

C₆H₁₂O₆ → 2 C₂H₅OH + 2CO₂

mol ethanol :

[tex]\tt \dfrac{5000~g}{46~g/mol}=108.7~moles[/tex]

moles of glucose to produce 108.7 moles ethanol :

[tex]\tt \dfrac{1}{2}\times 108.7=54.35[/tex]

54.35 moles = 5 hours

moles of 1000 kg of glucose :

[tex]\tt \dfrac{10^6~g}{180~g/mol}=5555.5~moles[/tex]

So for 5555.5 moles, it takes :

[tex]\tt \dfrac{5555.5}{54.35}\times 5~hours=511.085~h=21.3~days[/tex]

Explain why Chlorine has the largest electronegativity between Ne, Mg, Ba, Sb, Hg, Li?

Answers

Answer:

Look at the image provided and try work it out. I don't have the time but I hope I helped you!

Explanation:

People's actions can cause air pollution. People can plant trees to help reduce air pollution.
How does planting trees help reduce air pollution?
O A Trees take in nitrogen and dust.
B. Trees block sunlight from reaching the ground.
O c Trees produce oxygen and take in carbon dioxide.
D. Trees add nutrients to the soil that other living things need

Answers

Answer:

c

Explanation:

Write the ionic equation, including state symbols, for the reaction between zinc and iron(II) sulfate

Answers

Answer:

Fe (s) + Cu^2+ (aq) + SO4^2- (aq) --> Cu (s) + Fe^2+ (aq) + SO4^2- (aq)

Explanation:

teachers instructions - “ clear my examples and replace with your own words “ you get brainliest if I get good grade :)

Answers

Answer:

can you give me more clearence on what is going on

Explanation:

Although the order of elements is based on atomic number, vertical families share similar chemical properties.

Question 12 options:
True
False WHAT IS IT

Answers

Answer:

It's true

Explanation:

Uhhh, the internet! lol.

Answer:

It's true, ExplanationVVV

Explanation: Because the order of elements is based on atomic number, vertical families share similar chemical properties.

what is chemistry?

in your own word please 2-3 sentence ​

Answers

Answer:

the science that deals with the properties, composition, and structure of substances they undergo, and the energy that is released or absorbed during these processes.

Explanation:

Answer:

Is the scientific branch that deals with the composition and decomposition of elements and compounds in nature

2C3H7OH + 9O2 --> 6CO2 + 8H2O

Determine the number of grams of CO2 produced from the reaction of 5.55 moles of C3H7OH?

a
1466 g

b
16.7 g

c
367 g

d
12.2 g

e
733 g

Please show work

Answers

Answer 12.2g is the answer

If you discover a new element, how would you know where it should go on the periodic table

Answers

Answer:

the atomic number

Explanation:

it would be in the upper corner

HELP!!! ASAP!!!! WILL MARK BRAINLIEST!!!!






A certain covalent compound contains sulfur bonded to chlorine. Which of the following statements about this compound is correct?
Question 5 options:

A)

Electrons will reside closer to sulfur, and the bond will be non-polar.

B)

Electrons will reside closer to sulfur, and the bond will be polar.

C)

Electrons will reside closer to chlorine, and the bond will be polar.

D)

Electrons will reside closer to chlorine, and the bond will be non-polar.

Answers

Answer:

C) Electrons will reside closer to chlorine, and the bond will be polar

Explanation:

Electrons tend to be closer or attracted to high electronegativity and sulfur has less electronegativity than chlorine. Therefore, electrons will reside closer to chlorine. To find out if it is polar or nonpolar, according to the electronegativity chart you can find online, you can see that the electronegativity of sulfur is 2.5 while the electronegativity of chlorine is 3.0. Because the difference between these two is a slight change, it would be slightly polar. So, the bond will be polar.

Answer:

Electrons will reside closer to chlorine, and the bond will be polar.

Explanation:

State and explain each law of motion.

Answers

Answer:In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration. In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction

Explanation:

Answer:

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Explanation:

e

Automobile catalytic converters use a platinum catalyst to reduce air pollution by changing emissions such as carbon monoxide, CO(g), into carbon dioxide, CO2(g). The uncatalyzed reaction is represented by the balanced equation below.2CO(g) O2(g) 2CO2(g) +heat. determine the mass of O2(g) required to completely react with 784g moles of CO(g) during this reaction.

Answers

Answer: 448 g of [tex]O_2[/tex] will be required to completely react with 784g moles of CO(g) during this reaction.

Explanation:

To calculate the moles :

[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]    

[tex]\text{Moles of} CO=\frac{784g}{28g/mol}=28moles[/tex]

The balanced chemical equation is:

[tex]2CO(g)+O_2(g)\rightarrow 2CO_2(g)[/tex]  

According to stoichiometry :

2 moles of [tex]CO[/tex] require  = 1 mole of [tex]O_2[/tex]

Thus 28 moles of [tex]CO[/tex] will require=[tex]\frac{1}{2}\times 28=14moles[/tex]  of [tex]O_2[/tex]

Mass of [tex]O_2=moles\times {\text {Molar mass}}=14moles\times 32g/mol=448g[/tex]

Thus 448g of [tex]O_2[/tex] will be required to completely react with 784g moles of CO(g) during this reaction.

Answer:

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Explanation:

Please help

mg(oh)2
How many H atoms are there?
How many Mg?
What is the total number of atoms?

Answers

Answer:

There are 2 hydrogen atoms, one magnesium atom, and 5 atoms in total.

Explanation:

We are given a compound in formula form. To make things easier to understand, we can first convert this to the name of the compound.

When a compound contains one or more elements in parentheses, these are usually a polyatomic ion. Polyatomic ions are ions made up of two or more elements with a positive or negative charge over the entire ion. Commons examples of these NH₄⁺ (ammonia) and HCO₃⁻ (bicarbonate). You can combine metals with polyatomic ions to create commonly known compounds, such as baking soda. The chemical name for baking soda is sodium bicarbonate, so we can combine Na (sodium) with HCO₃⁻ (bicarbonate) and create sodium bicarbonate: NaHCO₃.

This compound is one magnesium atom bonded to two hydroxide ions.

Hydroxide is the compound between one hydrogen atom and one oxygen atom. The compound overall adopts a negative charge of 1.If we have one hydrogen atom and one oxygen atom, the most electronegative atom is written first in chemical formulas. Therefore, the symbol for Oxygen (O) goes first.Then, write in the hydrogen atom directly after the O symbol: OH.Finally, since we have a negative charge on the ion, we need to play a negative sign as a superscript for the compound. Therefore, this becomes OH⁻.

Now, we need to determine the charge on the Magnesium atom which is determined from the amount of valence electrons the atom has.

On a periodic table, the symbol for Magnesium is Mg and this element has 2 valence electrons. In order to fulfill the Octet Rule, the It is more likely to give up 2 electrons to a nonmetal than it is to gain 6, so we can safely assume that the charge is ²⁺.We need to use the criss-cross technique to transfer the charges between the element and the ion, so the negative 1 charge goes to the Mg, which does not appear (negative 1 or positive 1 are implied) and since the magnesium has a charge of positive 2, this is the subscript for the hydroxide ion.Therefore, our compound becomes Mg(OH)₂, and we have labeled this as magnesium hydroxide.

Now, to the number of atoms:

The new charge on Mg is 1-, so there is only one atom of Mg.The charge is 2+ on the OH ion, so there are two atoms of H and two atoms of O.Two atoms of oxygen, two atoms of hydrogen, and one atom of magnesium add up to be five atoms in total.

when 45mL of 0.25mol/L sulfuric acid is mixed w/ 25mL of 0.58mol/L Calcium hydroxide, the solution has a?

Answers

Pls pls help I don’t have time HELP ASAP. It also detects if it’s right or wrong. Pls pls help I don’t have time HELP ASAP. It also detects if it’s right or wrong.

Please help!! This would mean so much to me!!

Answers

Answer:

I think it's the A one. Hope it's correct

Answer:

A option is correct

Explanation:

If the gas tap to the Bunsen burner is turned on, the methane does not start burning until it is lit with a match. Why is heat from the match needed to start the methane burning?

Answers

Answer:

The reaction has a high activation energy

Explanation:

The burning of methane is a spontaneous reaction. Once the burning begins, the flame is able to sustain itself without any additional input of energy. It is an exothermic reaction in which energy is given out in the form of heat.

The reason why heat from the match is needed to start the burning of methane is that the activation energy of the combustion of methane is high. Activation energy is the energy that must be supplied in order for the collision of reactants to result in chemical reaction.

As long as the activation energy is high, the reaction can not occur without an external input of energy (e.g striking a match). Hence the answer.

Can you please help me ASAP

Answers

Answer:

The Milky Way is a large barred spiral galaxy

Explanation: that has more than etc

Carbon Monoxide is a toxic gas that is colorless and tasteless. How many moles of CO are in 1 L of the gas at STP?

28 moles

0.045 moles

22.4 moles

0.224 moles

Answers

Answer:

0.045 moles

Explanation:

Given data:

Moles of CO = ?

Volume of gas = 1 L

Temperature and pressure = standard

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

n = PV/RT

n = 1 atm× 1L / 0.0821 atm.L/mol.K × 273 K

n = 1 atm.L / 22.41 atm.L/mol

n = 0.045 mol

APE X What is happening to particles of matter while a change of state is taking place?
a. They are staying at the same speed
b. They are multiplying in number
c. They are slowing down
d. They are speeding up

Answers

Answer:

a. They are staying at the same speed

Explanation:

IF CORRECT PLSPLSPLS GIVE BRAINLIEST WOULD APPRECIATE :)

Answer:

a. They are staying at the same speed

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Describe the process of freezing ice cream in terms of heat flow. WILL GIVE BRAINLIESTFind the equation of the lineperpendicular to y=-2x + 1 thatalso intersects the point (8, 2).y- Hx+ 1Enter what is the atmosphere for gas essential for animal life? find the slope thanks Help ASAP 20 PointsRead the poem.I Dwell In Possibilityby Emily DickinsonI dwell in Possibility A fairer House than Prose More numerous of Windows Superior for Doors Of Chambers as the Cedars Impregnable of eye And for an everlasting RoofThe Gambrels of the Sky Of Visitors the fairest For Occupation This The spreading wide my narrow HandsTo gather Paradise Question 1Part AWhat is a key theme of "I Dwell in Possibility"?The creation of art is a divine occupation.Writing is superior to other occupations.Being cut off from nature is a form of isolation.A solitary life is not worth living.Question 2Part BHow does Emily Dickinson develop the theme indicated in Part A?Dickinson describes writing poetry as gathering "Paradise."She beckons visitors to enter her home as often as they would like.She mocks occupations that don't involve writing.Dickinson compares poetry to living alone in isolation. Please helpcan u answer this in picture form? 4) After a horrible car wreck, Jamie had a broken ankle, a few minor cuts, scratches, and alarge bruise across her chest from the seatbelt. While at the hospital, they kept checking her leftlung because it kept collapsing.What systems are affected?Why? Which observation supports a model of the nature of light in which light acts as a wave?A. Constructive interferenceB. Temperature changeC. Blackbody radiationD. Photoelectric effect Nico and Lorena used different methods to determine the product of three fractions.Nicos MethodLorenas Method(2) (one-sixth) (Negative four-fifths) = (StartFraction 2 over 1 EndFraction) (one-sixth) (negative four-fifths) = StartFraction (2) (1) (negative 4) over (1) (6) (5) EndFraction = Negative StartFraction 8 over 30 EndFraction = Negative StartFraction 4 over 15 EndFraction(2) (one-sixth) (Negative four-fifths) = (StartFraction 2 over 1 EndFraction) (one-sixth) (negative four-fifths) = StartFraction (2) (1) (negative 4) over (1) (6) (5) EndFraction = Negative StartFraction 8 over Negative 30 EndFraction = StartFraction 4 over 15 EndFractionWhose solution is correct and why?Nico is correct because he knew that Negative four-fifths = StartFraction negative 4 over negative 5 EndFraction.Nico is correct because he knew that Negative four-fifths = StartFraction negative 4 over 5 EndFraction.Lorena is correct because she knew that Negative four-fifths = StartFraction negative 4 over 5 EndFractionLorena is correct because she knew that Negative four-fifths = StartFraction negative 4 over negative 5 EndFraction Letter from Birmingham Jail AssignmentAnswer the following questions after reading the letter.1. Who is he writing the letter to?2. Why is he responding to this particular criticism?3. What reasons does he give for being in Birmingham? Which do you believe to be the most important and why?4. What does he feel clergyman should have criticized in Birmingham?6. Explain the steps taken by local civil rights leaders to end the unfair treatment of African Americans in Birmingham prior to Kings arrival and demonstrations. What was the purpose of the demonstration?7. Evaluate Kings arguments on timing in his experiences.8. How does King differentiate between just and unjust laws? Provide examples.9. What role does King feel white moderates have in the struggle for equal rights?10. Why does King argue that demonstrators should be allowed to express themselves?11. Why do you think King in particular has been disappointed with white religious leaders?12. Paraphrase Kings feelings about the Birmingham police departments treatment of African Americans. Which battle was consider the beginning of the warA. LexingtonB. ConcordC. Bunker HillD. all of the above Evaluate functions from their graph f(-5)= What are the locations and end products for the processes of transcription andtranslation? if 50% is 10 what is 75% PLZ help ILL GIVE BRAINLEIST anybody remember that football game that everyone used to play during school A milestone occurring in which of these increments of time will be the farthest to the left on a timeline? 4 months 5 days 3 weeks 2 years Triangle IHJ is similar to triangle RST.What is the length of side _ RT answers for both boxes please HELP ME BRAINLIESTCreate a 3-stanza rap as if we were to have a cabinet battle today.Subject is:In-Person Learning or At Home Learningbut i chose at home 12 sentences