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Chemistry Unit 1

Total questions: 50

Worksheet time: 25mins

Name
Class
Date
1.

A mixture is

a)

a gaseous state of a substance that is liquid or solid at room temp

b)

a physical blend of two or more components

c)

part of a sample with uniform composition and properties

2.

A vapor is

a)

a gaseous state of a substance that is liquid or solid at room temp

b)

a physical blend of two or more components

c)

part of a sample with uniform composition and properties

3.

A phase is

a)

a gaseous state of a substance that is liquid or solid at room temp

b)

a physical blend of two or more components

c)

a part of a sample with uniform composition and properties

4.

A product is

a)

not uniform in composition

b)

a substance formed in a chemical reaction

c)

the starting substance in a chemical reaction

5.

A reactant is

a)

not uniform in composition

b)

a substance formed in a chemical reaction

c)

the starting substance in a chemical reaction

6.

A heterogeneous mixture is

a)

not uniform in composition

b)

a substance formed in a chemical reaction

c)

the starting substance in a chemical reaction

7.

A proton is

a)

the smallest particle of an element that retains the properties of that element

b)

a positively charged subatomic particle

c)

a negatively charged subatomic particle

d)

a subatomic particle with no charge

e)

the central part of an atom, containing protons and neutrons

8.

A nucleus is

a)

the smallest particle of an element that retains the properties of that element

b)

a positively charged subatomic particle

c)

a negatively charged subatomic particle

d)

a subatomic particle with no charge

e)

the central part of an atom, containing protons and neutrons

9.

An atom is

a)

the smallest particle of an element that retains the properties of that element

b)

a positively charged subatomic particle

c)

a negatively charged subatomic particle

d)

a subatomic particle with no charge

e)

the central part of an atom, containing protons and neutrons

10.

An electron is

a)

the smallest particle of an element that retains the properties of that element

b)

a positively charged subatomic particle

c)

a negatively charged subatomic particle

d)

a subatomic particle with no charge

e)

the central part of an atom, containing protons and neutrons

11.

A neutron is

a)

the smallest particle of an element that retains the properties of that element

b)

a positively charged subatomic particle

c)

a negatively charged subatomic particle

d)

a subatomic particle with no charge

e)

the central part of an atom, containing protons and neutrons

12.

The mass number is

a)

atoms with the same # protons, different # of neutrons

b)

# protons + # neutrons

c)

# of protons only

d)

the weighted average masses of isotopes

e)

1/12 the mass of a carbon atom (6 p+ and 6 n)

13.

The atomic mass unit (amu) is

a)

atoms with the same # protons, different # of neutrons

b)

# protons + # neutrons

c)

# of protons only

d)

the weighted average masses of isotopes

e)

1/12 the mass of a carbon atom (6 p+ and 6 n)

14.

The atomic number is

a)

atoms with the same # protons, different # of neutrons

b)

# protons + # neutrons

c)

# of protons only

d)

the weighted average masses of isotopes

e)

1/12 the mass of a carbon atom (6 p+ and 6 n)

15.

The atomic mass is

a)

atoms with the same # protons, different # of neutrons

b)

# protons + # neutrons

c)

# of protons only

d)

the weighted average masses of isotopes

e)

1/12 the mass of a carbon atom (6 p+ and 6 n)

16.

An isotope is

a)

atoms with the same # protons, different # of neutrons

b)

# protons + # neutrons

c)

# of protons only

d)

the weighted average masses of isotopes

e)

1/12 the mass of a carbon atom (6 p+ and 6 n)

17.

Matter has... (pick 2)

a)

mass

b)

importance

c)

volume

d)

visibility

18.

An example of an EXTENSIVE property is

a)

temperature

b)

pressure

c)

mass

d)

hardness

19.

Which of the following is a chemical property

a)

mass

b)

color

c)

melting point

d)

ability to rust

20.

A solid

a)

has definite volume and definite shape

b)

has definite volume and takes the shape of its container

c)

has indefinite volume and indefinite shape

21.

A liquid

a)

has definite volume and definite shape

b)

has definite volume and takes the shape of its container

c)

has indefinite volume and indefinite shape

22.

A gas

a)

has definite volume and definite shape

b)

has definite volume and takes the shape of its container

c)

has indefinite volume and indefinite shape

23.

Which of the following is a physical change

a)

corrosion

b)

explosion

c)

evaporation

d)

food rotting

24.

Which of the following is a heterogeneous mixture

a)

salt water

b)

milk

c)

air

d)

oil & vinegar

25.

Which of the following is a homogeneous mixture?

a)

salt water

b)

oil & vinegar

c)

sand & water

d)

soil

26.

True or False. Separating a solid from a liquid by evaporating the liquid is called distillation.

a)

True

b)

False

27.

True or False. Compounds can be separated into elements using physical means

a)

True

b)

False

28.

Which of the following is a compound

a)

Hydrogen

b)

Hydrogen - 3

c)

Oxygen - 16

d)

H2O

29.

Which of the following is a chemical property

a)

color

b)

hardness

c)

freezing point

d)

reactivity with chlorine

30.

Paper changing color in the sun is an example of a

a)

physical change

b)

chemical change

c)

neither

d)

both

31.

In a chemical reaction, matter is...

a)

created

b)

destroyed

c)

neither

d)

both

32.

True or False. Democritus believed that atoms retain their identity in a chemical reaction

a)

True

b)

False

33.

True or False. Dalton believed that atoms of the same element are always identical

a)

True

b)

False

34.

True or False. Atoms are very small

a)

True

b)

False

c)

Why are you even reading the 3rd option?

35.

Dalton thought that atoms are indivisible. It is now know that

a)

He was 100% right

b)

atoms can be divided

c)

atoms are indestructible

d)

atoms do not exist

36.

True or False. JJ Thomson found that the charge to mass ratio of electrons was always the same

a)

True

b)

False

37.

Which subatomic particle is the heaviest?

a)

Electrons

b)

Protons

c)

Neutrons

d)

Protons and Neutrons are about the same

38.

True or False. All atoms (not including ions) are neutral with # protons = # electrons

a)

True

b)

False

39.

The atomic number is based on the number of

a)

protons

b)

neutrons

c)

electrons

d)

protons + neutrons

40.

An element has an atomic number of 42. If it is neutral, the number of protons and electrons will be...

a)

84 protons & 42 electrons

b)

42 protons and 42 electrons

c)

42 protons and 0 electrons

d)

21 protons and 21 electrons

41.

# protons + # neutrons =

a)

# electrons

b)

atomic number

c)

mass number

d)

impossible

42.

The '12' in Carbon-12 represents

a)

the atomic number

b)

the mass number

c)

the protons + the electrons

d)

# protons x 2

43.

All atoms of the same element have the same number of

a)

protons

b)

neutrons

c)

electrons

d)

points on Fortnite

44.

Isotopes of the same element have different numbers of

a)

protons

b)

neutrons

c)

electrons

d)

nucleii

45.

An atom with a mass of 75 and an atomic number of 40 has

a)

35 protons

b)

35 neutrons

c)

75 electrons

d)

75 protons

46.

True or False. The nucleus of an atom has a positive charge

a)

True

b)

False

47.

Isotopes all have the same

a)

mass number

b)

atomic number

48.

If Phosphorus (atomic number = 15) had 16 neutrons, what would the mass number be?

a)

-1

b)

1

c)

31

d)

32

49.

Weighted average mass is measured in

a)

AMU

b)

grams

c)

kilograms

d)

moles

50.

If you knew the masses of each isotope of an element, and the relative abundance, you could calculate

a)

the atomic mass number

b)

the atomic number

c)

nothing

d)

the distance we are from the sun

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