Chapter 5 Chem

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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

3

The 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?

3

Tincture of iodine is an antiseptic. Which of the following is another antiseptic?

3% hydrogen peroxide

Which set of coefficients balances the equation? ____CH4→ ____C3H8 + ___H2

3,1,2

The Haber Process is a method for the production of ammonia, an important chemical intermediate. The reaction for this process is N2 + 3H2 → 2NH3. 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?

3.40

In the reaction 2H2O → 2H2 + O2, 2.0 mol water will produce how many grams of O2?

32

Most reactions give a percent yield of almost 100%.

False

A REDOX reaction can also be a(n)

More than one response is correct.

2CO + O2 → 2CO2

False

A net ionic equation may include one or more spectator ions.

False

All redox reactions are exothermic reactions.

False

All redox reactions involve oxygen.

False

The oxidation number of cesium (Cs) is always +1.

False

The energy involved in chemical reactions

can take many forms

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 left when the burning is complete?

C2H2, CO2, and H2O

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

CO

The oxidation number of iodine in HIO4 is +6.

False

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

single replacement

Lycopene, a phytonutrient, has several potential health benefits, including protection against prostate, cervical and pancreatic cancer. Which of the following is a good source of this substance?

tomatoes

Which ions will appear in the total ionic equation for the following reaction? Ba^2+ + CO ⅔ - + 2H^+ + SO 2/4- → CO2 + H2O + BaSO4

Ba2^+, CO ⅔-, H+, and SO 2/4-

What substance is oxidized in the following reaction? 4HCl + MnO2 → Cl2 + 2H2O + MnCl2

Cl in HCl

Which ions in the following reaction would be classified as spectator ions?

Cl-

Which of the following is a single replacement reaction?

CuO + H2 → Cu + H2O

In the reaction Zn + Cu(NO3)2 → Cu + Zn(NO3), the Zn is reduced.

False

Integers are used in properly balanced chemical equations because whole moles of substances are needed for a reaction.

False

Some redox reactions involve only oxidation without any reduction.

False

The reaction AgNO3 + HCl → AgCl + HNO3 is a redox reaction.

False

The reaction Mg + 3N2 → Mg3N2 is correctly balanced as written.

False

The reducing agent is the substance that is reduced in the reaction.

False

The ultimate source of all energy used by animals is the carbohydrates found in plants.

False

Which of the following contains the metal with the highest oxidation number?

FeCl3

Which of the following is a double replacement reaction?

HBr + KOH H2O + KBr

What is the reducing agent in the following reaction? 4HCl + MnO2 Cl2 + 2H2O + MnCl2.

HCl

Consider the reactants and propose the right side of the equation. Mg + H2SO4 → ____

MgSO4 + H2

What substance is reduced in the following reaction? 4HCl + MnO2 Cl2 + 2H2O + MnCl2

Mn in MnO2

What is the oxidizing agent in the following reaction? 4HCl + MnO2 Cl2 + 2H2O + MnCl2.

MnO2

When nitrogen (N2) reacts with sodium (Na), sodium nitride (Na3N) is formed. The balanced equation for the reaction would be:

N2 + 6 Na → 2Na3N

Which of the following is an oxidizing agent?

O2

Which of the following is a combination reaction?

SO2 + O2 --> 2SO3

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.

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

Sr3(PO4)2

Automotive car batteries rely on the reaction shown below. Identify the spectator ion(s). PbO2(s) + 4 H+(aq) + 2 SO4^2- (aq) + Pb(s) → 2 PbSO4(s) + 2 H2O(l)

There are no spectator ions.

In which of the following does an element have an oxidation number of +4?

TiO2

In an exothermic reaction, heat is liberated to the surroundings.

True

In ionic compounds, metals have a positive oxidation number.

True

In the reaction CuCl2 + Fe → Cu + FeCl2 the CuCl2 is the oxidizing agent.

True

In the real world, one should not expect to obtain as much product as can be predicted from the stoichiometric calculation.

True

Products are always on the right side of a chemical equation.

True

Redox reactions may also be decomposition reactions.

True

A percentage yield less than 100% is often obtained in a reaction. What is(are) the reason for obtaining less than theoretically predicted?

all of the choices

The reaction below would be considered _____ . CaCO3 + heat → CaO + CO2

an endothermic decomposition.

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

more than one response is correct

The modern definition of oxidation is a process

none of the choices.

When the following equation is balanced, how many oxygen atoms are present on the reactant side of the equation? C2H6 + O2 → CO2 + H2O

14

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

14.0

When the equation below is properly balanced, what coefficient is in front of KCl? KClO3 → KCl + O2

2

Which of the following is a decomposition reaction?

2H2O2 → 2H2O + O2

What is the oxidation number of Br in BrO2-?

+3

What is the oxidation number of Cl in HClO3?

+5

What is the assigned oxidation number for molybdenum in aluminum molybdate, Al2(MoO4)3?

+6

What is the oxidation number of Mn in KMnO4?

+7

Which of the following conversion factors would allow one to calculate the amount of PbI2 produced from a given amount of NaI in the following unbalanced reaction? Pb(NO3)2 + Nal → Pbl2 + NaNO3

1 molPbl2/ 2molNal

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?

1.5

Which species would be considered a spectator ion based on the following equation? Ba2+ + 2NO3 + 2Na+ + SO4^2+ → BaSO4(s) + 2NO3- + 2Na+

2NO3

What are coefficients needed to balance the following reaction? 2 CH4 + ____ O2 → ____ CO2 + ____ H2O

4,2,4

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?

4.03

A container is filled with 4.0 g H2 and 5.0 g O2. The mixture is ignited to produce water according to the following equation. How much water is produced? 2H2 + O2 → 2H2O

5.6 g

Given the equation 2CO + O2 → 2CO2, how many grams of CO2 form if 34.0 grams of CO are combined with excess oxygen?

53.4

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?

6.02 x 10^22

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?

93.86 %

The batteries in an automobile contain lead plates, water, PbSO4 and H2SO4. The instructions with a battery charger state that when a car battery is being charged, there must be no flames or sparks. Hydrogen is liberated during the process and might explode on ignition. Therefore, the hydrogen released is an indication that a redox reaction occurs during the charging process.

True

The net ionic equation for the reaction H2SO4 + NaOH → Na2SO4 + H2O is H+ + OH → H2O.

True

The oxidation number of Cr in K2CrO4 is +6.

True

The reaction Ca + Cl2 → CaCl2 is a redox reaction.

True

The reactions NaOH + HCl → H2O + NaCl and Ca(OH)2 + 2HBr → 2H2O + CaBr2 have the same net ionic equation.

True

Water is a product when any inorganic acid reacts with any inorganic base.

True

While antiseptics and disinfectants are both antibacterials, only an antiseptic should be used on living tissue.

True

Which of the following statements is not true about the reaction? 2 CH4 + 3 O2→ 2 CO2 + 4 H2O

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. The equation for its production is Ba2+ + SO BaSO4(s). What type of equation is this?

a net ionic equation

Airbags serve an important role in providing driver and front-seat passenger protection in the event of an automobile accident. They rely on several chemical reactions. Which of the following chemicals is responsible for N2 production?

more than one answer is correct

Consider the following chemical equation. Which substance is oxidized? BaCl2 (aq) + H2SO4 (aq) → BaSO4 (s) + 2HCl (aq)

none of them

In the equation for an endothermic reaction, the word "heat" appears

on the left side

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.

The following would represent what type of chemical reaction?

single replacement

The reaction 2KBr + F2 2KF + Br2 is an example of a _____ reaction.

single replacement

Which is not a meaning of oxidation?

to gain electrons

Which of the following phrases can be used to describe the process of reduction?

to gain oxygen

For the reaction of HCl and NaOH, which of the following type of chemicals will appear in the net equation?

water


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