jeopardy. review unit 3 final jeopardy 300 500 400 100 counting particles 200 300 400 500 100 200...

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Jeopardy

Review Unit 3

Final Jeopardy

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100

Counting ParticlesCounting Particles

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300

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500

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Chemical Rxns

Chemical Rxns StoichiometryStoichiometryMole StuffMole Stuff

Avogadro & His Number

PLUS MORE!

Avogadro & His Number

PLUS MORE!

600

100

600 600 600 600

Mole Stuff 100

What is a mole?

Mole Stuff 100 - Answer

A volumetric unit of measure.

One mole has as many particles in it as Avogadro’s number.

Mole Stuff200

What is the molar mass?

How do you find it?

Mole Stuff200 - Answer

The molar mass is the mass of one mole of substance.

It can be found by reading the atomic masses on the periodic table.

Mole Stuff300

What is relative mass?

How is it connected to the Periodic Table?

Mole Stuff300 - Answer

Relative masses are masses relative to the smallest mass

available.

The atomic masses on the Periodic Table are all relative to Hydrogen.

Mole Stuff400

What is the molar mass of potassium oxide?

Mole Stuff400 - Answer

K2O

39 g/mol + 39 g/mol + 16 g/mol

94 g/mol

Mole Stuff 500

How many moles are in a 12.0 g sample of iron (III)

oxide?

Mole Stuff500 - Answer

0.075 moles Fe2O3

Molar mass Fe2O3: 159.6 g/mol

(12g) * (1mol/159.6g) = 0.075 mol

Mole Stuff 600

What is the mass of 0.015 moles of

calcium hydroxide?

Mole Stuff600 - Answer

1.11 grams Ca(OH)2

Molar Mass Ca(OH)2: 74 g/mol

(0.015mol) * (74g/1mol) = 1.11 g

Avogadro & His Number100

What is Avogadro’s Number?

What does it mean?

Avogadro & His Number100 - Answer

6.02 x 1023

This is how many particles are in one mole of substance

Avogadro & His Number200

How many silver atoms are contained in 0.650 grams of silver?

Avogadro & His Number200 - Answer

3.63 x 1021 atoms

(0.65g) * (1mol/107.9g) * (6.02x1023part/1mol) =

3.63 * 1021 particles

Avogadro & His Number300

How many atoms are in 0.450 gram of

iron?

Avogadro & His Number300 - Answer

4.86 x 1021 atoms Fe

Avogadro & His Number400How many molecules are in 13.2 grams of carbon dioxide?

Avogadro & His Number400 - Answer

1.81 x 1023 molecules CO2

Avogadro & His Number500

How many H2 molecules are there in 0.25 moles of H2?

Avogadro & His Number500 - Answer

1.5 x 1023 particles H2

Avogadro & His Number600

How many O atoms in 0.456 moles of AgNO3?

Avogadro & His Number600 - Answer

8.24 x 1023 O atoms

Counting Particles 100

How many oxygen atoms are represented by the

formula Pb(C2O4)2 ?

Counting Particles100 - Answer

8

Counting Particles200

What is total number of atoms represented by

the formula Fe2(SO4)3 ?

Counting Particles200 - Answer

17

Counting Particles 300

A 9.56 g sample of copper (II) sulfide is found to contain

6.35 g of copper. What is the percent by mass of the copper and sulfur in this compound?

Counting Particles 300 - Answer

66.4% Cu and 33.6% S

(6.35gCu/9.65g)*100% = 66.4%

(3.21gS/9.65g)*100% = 33.6%

Counting Particles 400

Given the diagram of the molecule below, write the empirical and molecular formulas. Label each.

= H

= C

Counting Particles 400 - Answer

Molecular: C2H6

Empirical: CH3

= H

= C

Counting Particles 500

When 0.062 g of phosphorus burns in air, it forms 0.142 g of phosphorus oxide. Determine the empirical formula of phosphorus oxide.

Counting Particles 500 - Answer

P2O5

Convert mass to moles Ratio of Moles Whole #(0.062g P)*(1mol P/31g P) = 0.002mol P 1 x2 = 2

(0.08g O)*(1mol O/16g O) = 0.005mol O 2.5 x2 = 5

Counting Particles 600

What is the molecular formula of each compound?

Empirical Formula Actual Molar Mass of Compound

CH 78 g/mole

NO2 92 g/mole

Counting Particles 600 - Answer

C6H6

N2O4

Chemical Rxns 100

Balance the following reaction:

__Sr(OH)2 + __FeCl3 __SrCl2 + __Fe(OH)3

Chemical Rxns 100 - Answer

3Sr(OH)2 + 2FeCl3 3SrCl2 + 2Fe(OH)3

Chemical Rxns 200

What type of reaction is the following?

C2H4 + 3O2 –> 2CO2 + 2H2O

Chemical Rxns 200 - Answers

COMBUSTION REACTION

boom!

Chemical Rxns 300

A reaction takes place in a test tube. You feel the bottom of the tube and it feels warm. Is the reaction exothermic or endothermic? WHY?

Chemical Rxns 300 - Answer

EXOTHERMIC

The system is releasing heat to the surroundings – energy is exiting the system and moving into your hand.

Chemical Rxns 400

Write a balanced chemical reaction for the reaction below:

Magnesium hydroxide reacts with nitric acid (HNO3) to form water and magnesium nitrate.

Chemical Rxns 400 - Answer

Mg(OH)2 + 2HNO3 2H2O + Mg(NO3)2

Chemical Rxns 500

What is the formula of the missing product molecule?

AA

DB

BBC

CC

D

D

+ + ?

A

A

Chemical Rxns 500 - Answer

A2BCD

Chemical Rxns 600Write a balanced chemical reaction for the

following reaction:

The combustion of ethane gas, C2H6, produces carbon

dioxide gas and water vapor. This reaction is exothermic.

Chemical Rxns 600 - Answer

2C2H6 + 7O2 4CO2 + 6H2O

Stoichiometry100

What do the coefficients in a

chemical reaction mean?

Stoichiometry100 - Answer

The coefficients tell us how many of each molecular are involved in the reaction.

They also tell us the ratio (in moles) of each compound to the others.

Stoichiometry 200

Hydrogen sulfide (H2S) burns in air to produce sulfur dioxide and water. How many moles of oxygen gas would be needed to completely burn 8 moles of hydrogen sulfide?

Stoichiometry 200 - Answer

12 mol O2

Equation: 2H2S + 3O2 2SO2 + 2H2O

Before: 8 mol xs 0 mol 0 mol

Change: -8 mol x(3/2) 12 mol +8 mol +8 mol

After: 0 mol xs 8 mol 8 mol

Stoichiometry300

What is the ratio of moles of oxygen gas to moles of carbon dioxide in the reaction below?

2C2H6 + 7O2 4CO2 + 6H2O

Stoichiometry 300 - Answer

7 to 4

7:47/4

Stoichiometry400

Can you use grams when filling out a BCA table?

Why or Why not???

Stoichiometry 400 - Answer

No grams allowed! Only moles.

The ratios in a chemical reaction only apply for moles of each substance.

Stoichiometry500Calculate the number of moles of sodium oxide

that should be produced when 6.50 grams of sodium react with oxygen gas.

Stoichiometry 500 - Answer

0.14 mol Na2O

(6.5g Na)*(1mol/23g Na) = 0.28 mol Na

Equation: 4Na + O2 2Na2O

Before: 0.28mol xs 0 mol

Change: -.28mol -.07mol +0.14mol

After: 0 mol xs 0.14 mol

Stoichiometry 600

What does stoichimetry help us do?

Stoichiometry 600 - Answer………

Use ratios to determine the amounts of substances that are used up, formed, or produced within a chemical reation.

Final Jeopardy

Final Jeopardy - Answer