Chemitry 4

1.

1 point

Photochromic lenses contain

Only AgCl embedded in the glass

Both Agcl and CuCl embedded in the glass

Only CuCl embedded in the glass

neither Agcl or CuCl embedded in the glass

2.

1 point

The corrosion of metals, such as the rusting or iron, is an example of

Proton transfer

transmutation

reducing

oxidizing

3.

1 point

The oxidation number of Cl -1

+1

0

2

-1

4.

1 point

sodium bisulfite converts Bromine (Br2) to bromine (Br-). sodium bisulfite is acting as a(n)

Base

Oxidizing agent

reducing agent

Acid

5.

1 point

most chemical explosions are _______ reactions

condensation

neutralization

oxidation reduction

nuclear fission

6.

1 point

The black tarnish on silver is

AgOH

AgCl

Ag2S

Ag2O

7.

1 point

The destructive power generated by an explosive mixture results from a rapid expansion of gaseous products

True

False

8.

1 point

Copper is planted on zinc by immersing a piece on zinc in a solution containing Copper(II) ions. In the planted reaction, copper (II) ions

lose two electrons and is reduced

lose two electrons and is oxidized

gain two electrons and is oxidized

gain two electrons and is reduced

9.

1 point

Benzoyl peroxide, used in treatment of acne, is

a reducing agent

a base

an acid

an oxidizing agent

10.

1 point

Consider the following reaction: 2Fe + 3 Mg 2+ ---> 2fe3 + 3 Mg
The half reaction for the reduction in this reaction is

Mg ---> Mg2+ + 2 e-

Mg2+ + 2 e- ---> Mg

Fe ---> Fe3 + e3-

Fe3+3 e- ---> Fe

11.

1 point

this compound is a powerful oxidizing agent and a harmful pollutant; yet a layer of it is in our upper stratosphere serves as a shield from harmful ultraviolet radiation from the sun

O2

SO3

CO2

O3 (ozone)

12.

1 point

In which of the following is the reactant undergoing oxidation

C ---> Co2

Cl2 ---> 2 Cl-

WO3 ---> W

2H + ---> 2H

13.

1 point

Human cells obtain energy by

oxidizing carbohydrates

absorbing sunlight

reducing proteins

reducing carbon dioxide

14.

1 point

When C3H8 is burned in oxygen the products are

CO2 + H2O

C + H2

CH2 + H2O

CO2 + H2

15.

1 point

The carbon in C2H6O2 _______ in the following reaction: C2H6O2--->C2H4O2 + H2

neutralized

electrlized

oxidized

reduced

16.

1 point

The active ingredient in many laundry bleaches and bleaching powders is

Sodium dicromate, Na2Cr2O7

chlorine, Cl2

Hydrogen peroxide, H2O2

hypochlorite ions, ClO-

17.

1 point

in the photosynthesis reaction: 6 CO2 + 6 H2O--->C6H12O6 + 6 O2 carbon dioxide is

oxidized and reduced

reducied

oxidizied

neither oxidized nor reduced

18.

1 point

Silver is planted on copper by immersing a piece of copper in a solution containing silver ions. in the planting reaction, silver ions (Ag+ to Ag 0)

lose one electrons and is reduced

gain one electrons and is reduced

gain one electrons and is oxidized

lose one electrons and is oxidized

19.

1 point

Which of the following is a definition of Oxidation?

Oxidation is the lose of Oxygen

Oxidation is the Lose of electrons

Oxidation is the addition of electrons

Oxidation is the addition of hydrogen

20.

1 point

In which of the following partial reactions is the reactant undergoing reduction?

KClO2 ---> KClO3

PbO ---> Pb

Cu2O ---> CuO

SNO ---> SNO2

21.

1 point

Conciser the following unbalanced equation between copper (I) ions and Iron to produce copper metal and Iron(II) ions: Cu + Fe ---> Cu + Fe2+
What is Oxidized in this reaction?

Iron(II) ions

Copper(I) ions

copper

Iron

22.

1 point

swimming pools are "chlorinated" in order to

disinfect the water

Improve the taste of the water

clarify the water

purify the water

23.

1 point

In food chemistry, reducing agents are sometimes referred to as antioxidants

True

False

24.

1 point

Which of the following is the definition of reduction

Reduction is the gain of both hydrogen and oxygen

Reduction is the lose of hydrogen

Reduction is the gain of hydrogen

Reduction is the gain of oxygen

25.

1 point

aluminum is more reactive than iron, yet it is used today for a variety of applications in which iron would corrode. The reason the corrosion durability of aluminum is that

very nonreactive aluminum oxide forms a thin layer of aluminum

aluminum does not react with oxygen

all aluminum products are treating with plastic coating

aluminum does not undergo oxidation