Deck 1: Basic Concepts of Chemistry

Question 1

The element whose symbol is Sn is

A) tin.
B) calcium.
C) calcium...
D) calcium..
E) none of these.

Answer 1

tin.

Question 2

Which one of the following substances is classified as a molecular element?

A) I₂
B) NO
C) KCl
D) C₆H₁₂O₆
E) CO

Answer 2

I₂

Question 3

What is the symbol for the element iron?

A) Fe
B) Kr
C) Li
D) S
E) N

Answer 3

Fe

Question 4

Which of the above figure represents a mixture of two elements?

A) Figure A
B) Figure B
C) Figure C
D) Figure D
E) Figure E

Question 5

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

A) barium
B) beryllium
C) bismuth
D) boron
E) bromine

Question 6

Which of the following is not a mixture?

A) sea shells
B) ice cream
C) gasoline
D) wine
E) diamond

Question 7

A(n) ________ is a pure substance that is composed of only one type of atom.

A) ion
B) solution
C) element
D) molecule
E) gas

Question 8

Which of the following is not a correct name-symbol combination? ​

A) magnesium, Mg
B) nickel, Ni
C) phosphorus, P
D) krypton, Kr
E) potassium, Co

Question 9

Which of the following statements concerning green chemistry is not correct?

A) It is better to prevent waste than to treat or clean up waste after it is formed.
B) Synthetic methods should be designed to use and generate substances that possess little or no toxicity to human health or the environment.
C) Substances used in a chemical process should pose minimal risk for accidents.
D) Raw materials should be renewable whenever technically and economically practical.
E) Chemical syntheses should be done at extremely high temperatures to ensure harmful bacteria are destroyed.

Question 10

Which one of the following is most likely to be a homogeneous mixture?

A) soil
B) blood
C) gasoline
D) mortar (a mixture of calcium carbonate and sand)
E) plain yogurt

Question 11

What is the correct symbol for potassium?

A) P
B) Pm
C) K
D) Pt
E) Po

Question 12

An electrically charged atom or group of atoms is a(n) ________.

A) element
B) ion
C) molecule
D) heterogeneous mixture
E) solution

Question 13

Which of the above figures represents a homogeneous mixture?

A) Figure E
B) Figure A
C) Figure B
D) Figure C
E) Figure D

Question 14

What is the correct symbol for silver?

A) S
B) Si
C) Ag
D) Sr
E) Au

Question 15

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

A) cerium
B) carbon
C) chromium
D) cadmium
E) chlorine

Question 16

Which of the following is a heterogeneous mixture?

A) Antifreeze (a mixture of water and ethylene glycol)
B) Blood
C) Sugar water
D) Gasoline
E) Vinegar (a mixture of acetic acid and water)

Question 17

Which one of the following statements is correct?

A) A pure substance may be separated by filtration or distillation into two or more components.
B) A heterogeneous mixture is also known as a solution.
C) A heterogeneous mixture is composed of two or more substances in the same phase.
D) The composition is uniform throughout a homogeneous mixture.
E) The combination of a liquid and a solid always results in a heterogeneous mixture.

Question 18

Which of the above figures represents a liquid compound?

A) Figure A
B) Figure B
C) Figure C
D) Figure D
E) Figure E

Question 19

A hypothesis is a _____.

A) concise statement of behavior that is always the same under the same conditions
B) set of quantitative data
C) tentative explanation or predication based upon experimental observations
D) well-tested unifying principle that explains a body of facts
E) mathematical formula that models a pattern of behavior

Question 20

A pure substance composed of two or more different elements is a(n) ________.

A) ion
B) heterogeneous mixture
C) chemical compound
D) solid
E) solution

Question 21

________ energy is the energy associated with the separation of two electrical charges.

Question 22

Which of the following are extensive properties: mass, volume, and/or density?

A) mass only
B) volume only
C) density only
D) mass and volume
E) volume and density

Question 23

The law of ________ states that the total energy of the universe is constant.

Question 24

Substances like hydrogen (H₂) and oxygen (O₂) that are composed of only one type of atom are classified as ________.

Question 25

All of the following are examples of intensive properties of matter except _____.

A) boiling point
B) thermal conductivity
C) malleability
D) the amount of energy transferred as heat
E) color

Question 26

A(n) ________ is the smallest particle of an element that retains the characteristic chemical properties of that element.

Question 27

Density is an example of a(n) _____ property and does not depend on the amount of a substance.

Question 28

An intensive property of a substance is

A) independent of the amount present.
B) dependent on its volume, but not its mass.
C) not affected by its temperature.
D) dependent only on its temperature.
E) dependent only on its mass and volume.

Question 29

A mass of 10 g of table salt dissolves in water to form a(n) ________ mixture (i.e., a mixture that is uniform throughout).

Question 30

The ________ of a substance is defined as its mass per unit volume.

Question 31

Which of the following terms best describes ammonia, NH₃?

A) Homogeneous mixture
B) Ion
C) Element
D) Chemical compound
E) Atom

Question 32

To ensure integrity in science, experimental results should be ________ and reported in sufficient detail that the experiment can be repeated by others.

Question 33

Which one of the following statements is not a comparison of physical properties?

A) Mercury and gallium are both liquids at 50 °C.
B) Oxygen is more soluble in water than helium.
C) Silver and gold are malleable metals.
D) Oxygen and nitrogen are both liquids at -200 °C.
E) Calcium reacts more quickly than iron in acids.

Question 34

Which of the following statements is true of a chemical equation?

A) It is a representation of only a physical change rather than a chemical or molecular change.
B) It shows that the reactants on the left side of an equation produce the products on the right side of the equation.
C) The number of atoms found in the reactants doubles in the products.
D) The number of atoms found in the reactants halves in the products.
E) The identity of the substance in a chemical equation is preserved.

Question 35

Properties, such as color and density, which can be observed or measured without changing the composition of a substance are called ________ properties.

Question 36

Which of the following is an example of qualitative information about a substance?

A) Color of the substance
B) Melting temperature of the substance
C) Mass of the substance
D) Volume of the substance
E) Boiling temperature of the substance

Question 37

Which one of the following substances is classified as a chemical compound?

A) Ir
B) He
C) Ho
D) HI
E) In

Question 38

Potential energy possessed by water at the top of a waterfall is known as ________ energy.

Question 39

Many regulators, environmentalists, and citizens around the world believe that ________ development is required to meet today's economic and environmental needs while preserving the options for future generations to meet theirs.

Question 40

Which of following would be classified as a chemical change?

A) the transformation of solid carbon dioxide into gaseous carbon dioxide
B) the freezing of diesel fuel
C) the condensation of nitrogen gas
D) the removal of a color stain using bleach
E) the evaporation of water