Chem1360 Exam Chp. 8 Self Assessments

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In an electrochemical cell composed of two half-cells, ions flow from one half-cell to another through...

a porous partition

By number of atoms, what is the rank of hydrogen in abundance in the accessible portion of Earth?

third

Silver tarnish is mainly...

Ag2S

(pg. 207 for this Q and two others) Which substance is the oxidizing agent in the following reaction? ... Cu(s) + 2Ag+(aq) -- Al3+(aq) + Cr(s)

Al(s)

Which of the following is a common reducing agent?

C

Which of the following is a common oxidizing agent?

Cl2

When CH4 is burned in plentiful air, the products are...

Co2 + H2O

Which of the following is a common reducing agent?

H2

Which of the following is a common oxidizing agent?

H2O2

In a typical explosive reaction, which of the following usually occurs?

Liquids or solids are converted to gases

Which of the following partial equations best represents a reduction of molybdenum?

MoO2 + 4H2 -- Mo + 2H2O

Which of the following partial equations represents an oxidation of nitrogen?

NO2 -- N2O5

The main active ingredient in common household bleach, often called CHLORINE BLEACH, is...

NaOCl

In a lead storage battery, the product of both cathode and anode had-reactions is...

PbSO4

When sulfur burns in plentiful air, the product is...

SO2

In one kind of electrochemical cell, the anode is___ and the cathode is ___.

Zn, C

All the following metals are used as catalysts for reactions involving hydrogen gas EXCEPT... (which metal is not used as a catalyst for reactions involving hydrogen gas)

aluminum

Hydrogen gas can be produced by reacting an active metal such as zinc with...

an acid

The main process by which animals obtain energy from food is...

cellular respiration

Which of the following is NOT one of the ways we can view oxidation? ... electrons gained, hydrogen atoms lost, electrons lost or oxygen atoms gained

electrons gained

Corrosion of aluminum is not as big a problem as corrosion of iron because aluminum...

forms an oxide layer that adheres to the metal's surface

Although helium gas is twice as dense as hydrogen gas, modern blimps are filled with helium because hydrogen is...

highly flammable

Bleach for hair usually contains...

hydrogen peroxide

When an element is oxidized, its oxidation number...

increases, as electrons are lost

A reducing agent...

loses electrons

(pg. 206) According to the following partial equation, manganese... Mn -- Mn^2+ + 2e-

loses electrons and is oxidized

A catalyst changes the rate of a chemical reaction by...

lowering the activation energy

What type of reaction is the corrosion of iron?

oxidation-reduction

Many disinfectants are...

oxidizing agents

The only natural process that produces O2 is...

photosynthesis

Black powder is a mixture of charcoal (carbon), potassium nitrate, and sulfur. The oxidizing agent in black powder is...

potassium nitrate

According to the following partial equation, Cl2 is...

reduced only

When CrO4- reacts to form Cr3+, the chromium in CrO4- is...

reduced; it loses oxygen

The fluid in the chamber of a lead storage battery is...

sulfuric acid


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