chemistry test 1: chapter 5

e Haber Process is a method for the production of ammonia, an important chemical intermediate. The reaction for this process is: N2 + 3H2 → 2NH3. When the equation is correctly interpreted in terms of moles, how many moles of H2 will react with one mole of N2? a) 1 b) 2 c) 3 d) 6

3

Which set of coefficients balances the equation? _____ CH4 → _____C3H8 + ______H2 a) 3,1,1 b) 3,2,1 c) 3,1,2 d) 6,2,2

3,1,2

Refer to Haber Process. According to the mole interpretation, how many grams of NH3 could be produced by the complete reaction of 2.80 grams of N2 and excess H2? a) 34.0 b) 17.0 c) 3.10 d) 3.40

3.40

Given the equation 2CO + O2→2CO2, how many grams of CO2 form if 34.0 grams of CO are combined with excess oxygen? a) 53.4 b) 21.6 c) 145 d) 107

53.4

Tests are to be conducted on new anti‐cancer drug and you are to prepare a fresh supply for the human subject studies. You discover that you were able to produce 1.345 g of this substance although it was theoretically possible to make 1.433 g. What was the percent yield for this synthesis? a) 93.859% b) 93.86% c) 94% d) 0.9386%

93.86%

A percentage yield greater than 100% has been reported in a scientific paper you are assigned to read. What would be a reasonable explanation for this?

Small measurement errors could have caused this to occur.

A redox reaction can also be a:

more than one response is correct

Which of the following equations (not balanced) represents an oxidation‐reduction process?

more than one response is correct

In the equation for an endothermic reaction, the word ʺheatʺ appears:

on the left side

Which of the following is a combination reaction?

SO2 +O2 →2SO3

what is the oxidation number of Mn in KMnO4 a) +9 b) +7 c) +5 d) +4

+7

Acetylene, C2H2, burns according to the following reaction: C2H2+5O2 → 4CO2+2H2O Suppose 1.20 g of C2H2 is mixed with 3.50 g of O2 in a closed, steel container, and the mixture is ignited. What substances will be found in the mixture when the burning is complete? a) CO2 and H2 b) O2, CO2, H2O c) C2H2, CO2, and H2O d) O2, C2H2, CO2, and H2O

C2H2, CO2, and H2O

If 5 grams of CO and 5 grams of O2 are combined according to the reaction 2CO + O2 → 2CO2, which is the limiting reagent? a) CO2 b) O2 c) CO d) CO and O2

CO

The following questions are based on the following reaction. 4HCl + MnO2 → Cl2 + 2H2O + MnCl2 What substance is oxidized? a) Cl in HCl b) Mn in MnO2 c) H in HCl d) O in MnO2

Cl in HCl

Which ions in the following reaction would be classified as spectator ions? Zn+2H+ +2Cl‐ →Zn2+ +2Cl‐ +H2 a) Zn^2+ b) H+ c) Cl- d) more than one response is correct

Cl‐

What coefficients are needed to balance the following reaction: CH4 + _____O2 → ____CO2 + _____ H2O a) 4,1,2 b) 2,0.5,1 c)2,1,2 d) none of these

2,1,2

which ion or ions will appear in the following (total ionic) reaction when it is written in net ionic form?

Ba^2+, CO3^2-, H+, and SO4^2-

what is the oxidation number of Br in BrO2^- a) -1 b) +1 c) +2 d) +3

+3

what is the oxidation number of Cl in HClO3? a) +2 b) +3 c) +4 d) +5

+5

Which of the following is a double replacement reaction?

HBr+KOH→H2O+KBr

Tincture of iodine is an antiseptic. What is a tincture?

a substance dissolved in alcohol

The energy involved in chemical reactions:

can take many forms

Oxygen can be prepared in the lab by heating potassium chlorate in the presence of a catalyst. The reaction is 2KClO3 → 2KCl + 3O2. How many moles of O2 could be obtained from one mole of KClO3? a) 1.0 b) 1.5 c) 2.0 d) 3.0

1.5

How many grams of N2 are required to completely react with 3.03 grams of H2 for the following balanced chemical equation? N2 + 3H2 → 2NH3 a) 1.00 b) 6.00 c) 14.0 d) 28.0

14.0

When the equation below is properly balanced, what coefficient is in front of KCl? KClO3 → KCl + O2 a) 1 b) 2 c) 3 d) 4

2

Which of the following contains the metal with the highest oxidation number? a) CaCl2 b) NaCl c) FeCl3 d) CuCl2

FeCl3

In which of the following does an element have an oxidation number of +4? a) TiO2 b) HBr c) SO3 d) SO4 ^2-

TiO2

Which of the following is a decomposition reaction?

2H2O2 → 2H2O + O2

Which species would be considered a spectator ion based on the following equation? Ba2+ + 2NO3‐ + 2Na+ + SO42+ → BaSO4(s) + 2NO3‐ + 2Na+

2NO3^‐

Propane, C3H8, burns to produce carbon dioxide and water by the equation below. What is the coefficient in front of the carbon dioxide in the balanced equation? C3H8 +O2 → CO2 +H2O a) 1 b) 2 c) 3 d) 6

3

In the reaction 2H2O → 2H2 + O2, 2.0 mol water will produce how many grams of O2? a) 16 b) 32 c) 36 d) 64

32

Suppose 2.43 g of magnesium is reacted with 3.20 g of oxygen: 2Mg + O2 → 2MgO. How many grams of MgO will be produced? a) 5.63 b) 1.27 c) 8.06 d) 4.03

4.03

In the reaction 2CH4 + O2 → 2CO + 4H2, how many molecules of CO will be produced by the complete reaction of 1.60 grams of CH4? a) 12.0x10^23 b) 3.01x10^22 c) 6.02x10^22 d) 2.00

6.02x10^22

Which of the following is a single replacement reaction?

CuO+H2 →Cu+H2O

The following questions are based on the following reaction. 4HCl + MnO2 → Cl2 + 2H2O + MnCl2 What is the reducing agent? a) HCl b) Cl2 c) MnO2 d) MnCl2

HCl

Considerthereactantsandproposetherightsideoftheequation. Mg + H2SO4 → __________

MgSO4 + H2

The following questions are based on the following reaction. 4HCl + MnO2 → Cl2 + 2H2O + MnCl2 What substance is reduced? a) Cl in HCl b) Mn in MnO2 c) H in HCl d) O in MnO2

Mn in MnO2

The following questions are based on the following reaction. 4HCl + MnO2 → Cl2 + 2H2O + MnCl2 What is the oxidizing agent? a) HCl b) Cl2 c) MnO2 d) MnCl2

MnO2

Consider the reactants in the partial equation given. Which choice is a product? H3PO4 + Sr(OH)2 → __________

Sr3(PO4)2

Which of the following statements is true about the reaction? 2CH4 +3O2 →2CO2+4H2O

Water and carbon dioxide are products

Which of the following reactions is correctly balanced?

Zn+2HCl→H2 +ZnCl2

Barium sulfate is often ingested to aid in the diagnosis of GI tract disorders. What type of equation is this?

a net ionic equation

A percentage yield less than 100% is often obtained in a reaction. Which of the following could be the reason(s) for obtaining less than theoretically predicted?

all of the above -side reactions occurred -poor laboratory technique -reaction did not go to completion

The modern definition of oxidation is a process:

none of the above

Which of the following is typically an oxidizing agent?

oxygen

Single replacement reactions are always:

redox reactions

According to the law of conservation of matter, which of the following may NEVER occur as a result of a chemical reaction:

reduction in total mass

Which of the following types of chemical reaction classes always involve oxidation?

single replacement

Which of the following is not a common use of the term oxidation?

to gain electrons

For the reaction of HCl and NaOH, which of the following type of chemicals will appear in the net equation? a) weak acid b) weak base c) salt d) water

water