Question 1

The melting of ice is an example of a(n) ________ change.

Accepted Answer

The answer of The melting of ice is an example...

Question 2

Drugs and vaccinations relieve ________ and ________.

Accepted Answer

The answer of Drugs and vaccinations relieve ________ and ________....

Question 3

In the SI system of measurement, the unit of length is the

Accepted Answer

A)  kilogram. 
B)  meter. 
C)  liter. 
D)  yard. 
A)  kilogram. 
B)  meter. 
C)  liter. 
D)  yard.

Question 4

Saccharin is used in some artificial sweeteners. Saccharin has been shown to be a very weak carcinogen (a substance that causes cancer) in animal tests, but there is little evidence of carcinogenicity in humans. Studies have also shown that artificial sweeteners provide little benefit to those who want to lose weight. The DQ for saccharin is

Accepted Answer

A)  low. 
B)  moderate. 
C)  high. 
D)  uncertain. 
A)  low. 
B)  moderate. 
C)  high. 
D)  uncertain.

Question 5

What is the chemical symbol for potassium?

Accepted Answer

A)  P 
B)  Po 
C)  Pu 
D)  K 
A)  P 
B)  Po 
C)  Pu 
D)  K

Question 6

The substances in a heterogeneous mixture retain their chemical identity, but those in a homogeneous mixture do not.

Accepted Answer

A) True 
 B)False

Question 7

Tangible items or pictures used by scientists to represent invisible processes are called

Accepted Answer

A)  theories. 
B)  models. 
C)  laws. 
D)  experiments. 
A)  theories. 
B)  models. 
C)  laws. 
D)  experiments.

Question 8

The prefix micro means ________.

Accepted Answer

A)  10-9 
B)  10-6 
C)  10-3 
D)  103 
A)  10-9 
B)  10-6 
C)  10-3 
D)  103

Question 9

Temperature is a measure of the amount of heat an object contains.

Accepted Answer

A) True 
 B)False

Question 10

The melting point of a compound is 2400 K. What is this temperature on the Celsius scale?

Accepted Answer

A)  2673°C 
B)  2300°C 
C)  2188°C 
D)  2127°C 
A)  2673°C 
B)  2300°C 
C)  2188°C 
D)  2127°C

Question 11

A solution is another name for a(n)

Accepted Answer

A)  compound. 
B)  element. 
C)  heterogeneous mixture. 
D)  homogeneous mixture. 
A)  compound. 
B)  element. 
C)  heterogeneous mixture. 
D)  homogeneous mixture.

Question 12

A scientific hypothesis is

Accepted Answer

A)  explanatory. 
B)  predictive. 
C)  testable. 
D)  all of the above. 
A)  explanatory. 
B)  predictive. 
C)  testable. 
D)  all of the above.

Question 13

What is the name of the element with the symbol Hg?

Accepted Answer

A)  silver 
B)  gold 
C)  mercury 
D)  antimony 
A)  silver 
B)  gold 
C)  mercury 
D)  antimony

Question 14

Water has a density of 1.00 g/mL. If you put an object that has a density of 0.79 g/mL into water, it will sink to the bottom.

Accepted Answer

A) True 
 B)False

Question 15

When doing a risk-benefit analysis and determining DQ, which situation is often the most difficult to evaluate from both an individual and societal perspective?

Accepted Answer

A)  small benefit and high risk 
B)  large benefit and high risk 
C)  large benefit and low risk 
D)  All are equally difficult to evaluate. 
A)  small benefit and high risk 
B)  large benefit and high risk 
C)  large benefit and low risk 
D)  All are equally difficult to evaluate.

Question 16

A scientific law summarizes data while a scientific theory explains the data.

Accepted Answer

A) True 
 B)False

Question 17

Which of the following statements about basic research is NOT correct?

Accepted Answer

A)  Basic research is conducted primarily in universities and research institutes. 
B)  The results of basic research are often used as the basis for technological advances. 
C)  Basic research is carried out to develop a particular product. 
D)  Basic research is the search for knowledge for its own sake. 
A)  Basic research is conducted primarily in universities and research institutes. 
B)  The results of basic research are often used as the basis for technological advances. 
C)  Basic research is carried out to develop a particular product. 
D)  Basic research is the search for knowledge for its own sake.

Question 18

Which of the following could NOT be the temperature of a solid?

Accepted Answer

A)  2°C 
B)  2 K 
C)  -2°C 
D)  -2 K 
A)  2°C 
B)  2 K 
C)  -2°C 
D)  -2 K

Question 19

The boiling point of a liquid is 178°C. What is this temperature on the Kelvin scale?

Accepted Answer

A)  451 K 
B)  95 K 
C)  178 K 
D)  -95 K 
A)  451 K 
B)  95 K 
C)  178 K 
D)  -95 K

Question 20

A mixture of iron, salt and sand can be separated using a magnet, water, a filter and a hot plate. Think about this separation. The separation of this mixture

Accepted Answer

A)  uses only physical changes or processes. 
B)  uses only chemical changes or processes. 
C)  uses both chemical and physical changes or processes. 
D)  cannot be done with the materials listed. 
A)  uses only physical changes or processes. 
B)  uses only chemical changes or processes. 
C)  uses both chemical and physical changes or processes. 
D)  cannot be done with the materials listed.

Exam 1: Chemistry

The melting of ice is an example of a(n) ________ change.

Drugs and vaccinations relieve ________ and ________.

In the SI system of measurement, the unit of length is the

What is the chemical symbol for potassium?

The substances in a heterogeneous mixture retain their chemical identity, but those in a homogeneous mixture do not.

Tangible items or pictures used by scientists to represent invisible processes are called

The prefix micro means ________.

Temperature is a measure of the amount of heat an object contains.

The melting point of a compound is 2400 K. What is this temperature on the Celsius scale?

A solution is another name for a(n)

A scientific hypothesis is

What is the name of the element with the symbol Hg?

Water has a density of 1.00 g/mL. If you put an object that has a density of 0.79 g/mL into water, it will sink to the bottom.

When doing a risk-benefit analysis and determining DQ, which situation is often the most difficult to evaluate from both an individual and societal perspective?

A scientific law summarizes data while a scientific theory explains the data.

Which of the following statements about basic research is NOT correct?

Which of the following could NOT be the temperature of a solid?

The boiling point of a liquid is 178°C. What is this temperature on the Kelvin scale?

A mixture of iron, salt and sand can be separated using a magnet, water, a filter and a hot plate. Think about this separation. The separation of this mixture

Atoms

Atomic Structure

Chemical Bonds

Chemical Accounting

Gases, Liquids, Solids, and Intermolecular Forces

Acids and Bases

Oxidation and Reduction

Organic Chemistry

Polymers

Nuclear Chemistry

Chemistry of the Earth

Air

Water

Energy

Biochemistry

Food

Drugs

Fitness and Health

Chemistry Down on the Farm

Household Chemicals

Poisons

Filters

Drugs and vaccinations relieve and .