CHM1025 Final Exam Review (Study Union Fall 2024)

Question 1

How many silver atoms are there in 3.78 g of silver?

Accepted Answer

2.11	imes10^{22}

Question 2

How many significant figures are in 1.004?

Accepted Answer

4

Question 3

Write a balanced chemical equation for the reaction of solid strontium with iodine gas

Accepted Answer

Sr (s) + I2 (g) → SrI2 (s)

Question 4

What is the theoretical yield (in grams) of sodium chloride for the reaction of 55.0 g Na with 67.2 g Cl2?

Accepted Answer

111 g NaCl

Question 5

A reaction has a theoretical yield of 45.8 g and an actual yield of 37.2. What is the percent yield?

Accepted Answer

81.2%

Question 6

Write a balanced chemical equation for the reaction of solid lithium with liquid water

Accepted Answer

2 Li (s) + 2 H2O (l) → 2 LiOH (aq) + H2 (g)

Question 7

How many moles of I2 are produced by the reaction of 0.4235 mol of CuCl2 according to the equation below?

Accepted Answer

0.2118 mol I2

Question 8

Balance the following chemical equation: CO(NO3)3 (aq) + (NH4)2S (aq) → CO2S3 (s) + NH4NO3 (aq)

Accepted Answer

2 CO(NO3)3 (aq) + 3 (NH4)2S (aq) → CO2S3 (s) + 6 NH4NO3 (aq)

Question 9

Which of the following is equivalent to 3.5 L? (1 L = 1000 m3)

Accepted Answer

3,500 mL

Question 10

Write a balanced equation for the following reaction:

Accepted Answer

PbS (s) + 2 HBr (aq) → PbBr2 (s) + H2S (g)

Question 11

Complete and balance the following equation: C5H12S (g) + O2 (g) →

Accepted Answer

C5H12S (g) + 9 O2 (g) → 5 CO2 (g) + SO2 (g) + 6 H2O (g)

Question 12

Answer the following questions:

Accepted Answer

1.15 g/mL

Question 13

Determine the number of protons, neutrons, and electrons in the following isotope:

Accepted Answer

82 Protons, 126 Neutrons, 82 Electrons

Question 14

What is the percent composition of carbon in C5H11?

Accepted Answer

84.4%

Question 15

Name the following compound: HNO2

Accepted Answer

Nitrous Acid

Question 16

Classify the following substance: Tap Water

Accepted Answer

Homogeneous Mixture

Question 17

Determine the number of protons, neutrons, and electrons in the following isotope:

Accepted Answer

11 Protons, 12 Neutrons, 11 Electrons

Question 18

How many significant figures are in 0.0009?

Accepted Answer

1

Question 19

Calculate the atomic mass of magnesium using the following table:

Accepted Answer

24.31 amu

Question 20

What is the formula for Triphosphorous Pentachloride?

Accepted Answer

P3Cl5

Question 21

Determine the number of protons and electrons in the following ion:

Accepted Answer

17 Protons and 18 Electrons

Question 22

Classify the following statement: All matter is made of tiny indestructible particles called atoms.

Accepted Answer

Theory

Question 23

Use the mass spectrum of rubidium below to determine its atomic mass

Accepted Answer

85.7 amu

Question 24

Calculate the final answer and round to the correct number of significant figures: \left(19.5	imes2.5ight)-6.345

Accepted Answer

42

Question 25

Classify the following substance: Gold

Accepted Answer

Pure Substance: Element

Question 26

What is the formula for Iron (III) Chloride?

Accepted Answer

FeCl3

Question 27

Classify the following substance: Distilled Water

Accepted Answer

Pure Substance: Compound

Question 28

Classify the following statement: When a match burns, heat is released.

Accepted Answer

Observation

Question 29

Name the following compound: MgCl2

Accepted Answer

Magnesium Chloride

Question 30

Classify the following substance: Beef Stew

Accepted Answer

Heterogeneous Mixture

Question 31

Determine the molecular formula of a compound with an empirical formula of CH and a molecular mass of 78.110 amu

Accepted Answer

C6H6

Question 32

Is ice melting a physical or chemical change?

Accepted Answer

Physical

Question 33

Name the following compound: CCl4

Accepted Answer

Carbon Tetrachloride

Question 34

Balance the following chemical equation: CO2 (g) + CaSiO3 (s) + H2O (l) → SiO2 (s) + Ca(HCO3)2

Accepted Answer

2 CO2 (g) + CaSiO3 (s) + H2O (l) → SiO2 (s) + Ca(HCO3)2

Question 35

Is bleaching hair a physical or chemical change

Accepted Answer

Chemical

Question 36

Classify the following substance: Wine

Accepted Answer

Homogeneous Mixture

Question 37

What is the formula for Aluminum Oxide?

Accepted Answer

Al2O3

Question 38

Is density an intensive or extensive property?

Accepted Answer

Intensive

Question 39

Classify the following substance: Carbon Dioxide

Accepted Answer

Pure Substance: Compound

Question 40

Is mass an intensive or extensive property?

Accepted Answer

Extensive

Question 41

What is the formula for Hydrosulfuric Acid?

Accepted Answer

H2S

Question 42

Which of the following is NOT a postulate of Dalton's Atomic Theory?

Accepted Answer

All atoms of an element differ in properties like mass and atomic number

Question 43

Is paper burning a physical or chemical change?

Accepted Answer

Chemical

Question 44

Which law is defined below?

Accepted Answer

Law of Multiple Proportions

Question 45

Classify the following statement: In chemical reactions, matter is neither created nor destroyed.

Accepted Answer

Law

Question 46

Determine the number of protons and electrons in the following ion:

Accepted Answer

13 Protons and 10 Electrons

Question 47

When a 14.01 g sample of N2 reacts with H2 to form ammonia (NH3), what mass of ammonia is produced?

Accepted Answer

17.03 g NH3

Question 48

What is the formula for Phosphoric Acid?

Accepted Answer

H3PO4

Question 49

Name the following compound: CuNO3

Accepted Answer

Copper (I) Nitrate

CHM1025 Final Exam Review (Study Union Fall 2024)

Questions 49

CHM1025 Final Exam Review (Study Union Fall 2024)

Questions 49