Chem1360 Exam Chp. 8 Self Assessments
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