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8th Grade Science Midterm Exam

Total questions: 50

Worksheet time: 4mins

Name
Class
Date
1.

Protons and neutrons clump together to form the ___________.

a)

atom

b)

nucleus

c)

electron cloud

d)

element

2.

Which of these is the simplest atom?

a)

Oxygen

b)

Hydrogen

c)

Uranium

d)

Chlorine

3.

Elements that have some properties of metals and some properties of nonmetals are called __________.

a)

metalloids

b)

noble gases

c)

isotopes

d)

electrons

4.

Elements found on the left side of the periodic table (excluding Hydrogen) are classified as what?

a)

metalloids

b)

nonmetals

c)

noble gases

d)

metals

5.

What property refers to the amount of mass a substance has in a specific volume?

a)

volume

b)

boiling point

c)

density

d)

atomic weight

6.

Hydrogen, Helium, and Argon are all part of which category of elements?

a)

metals

b)

nonmetals

c)

metalloids

d)

noble gases

7.

This subatomic particle of an atom has a POSITIVE charge

a)

electron

b)

neutron

c)

proton

d)

isotope

8.

The number of protons in an atom is the _________.

a)

atomic mass

b)

atomic number

c)

nucleus

d)

atomic symbol

9.

The region around the nucleus occupied by orbiting electrons is called the __________.

a)

nucleus

b)

ozone layer

c)

electron cloud

d)

neutron cloud

10.

The Rutherford Experiment helped show what about atoms?

a)

They are the smallest unit of matter

b)

They need a chemical reaction to form bonds

c)

They are made up of mostly empty space

d)

They have the same number of protons and electrons

11.

Which of these elements is a metal?

a)

Zirconium

b)

Xenon

c)

Hydrogen

d)

Astatine

12.

Which of the following elements is a metalloid?

a)

Rhodium

b)

Mercury

c)

Antimony

d)

Bromine

13.

Which of the following elements would have the most electron shells?

a)

Potassium

b)

Gold

c)

Radon

d)

Radium

14.

Which of the following elements is a nonmetal?

a)

Iodine

b)

Boron

c)

Yttrium

d)

Zinc

15.

What is the average atomic mass of Mercury?

a)

80

b)

200.59

c)

196.97

d)

2 8 18

16.

Mercury metal is poured into a graduated cylinder that holds exactly 22.5 mL. The mercury used to fill the cylinder weighs 306.0 g. From this information, calculate the density of mercury.

a)

0.074 mL/g

b)

6885 g/mL

c)

13.6 g/mL

d)

13 grams

17.

A rectangular block of copper metal weighs 1896 g. The dimensions of the block are 8.4 cm by 5.5 cm by 4.6 cm. From this data, what is the density of copper?

a)

8.92 g/cm3

b)

0.112 g/cm3

c)

225.71 g/cm3

d)

15,926.4g/cm3

18.

Which of these would Carbon Dioxide be classified as?

a)

element

b)

compound

c)

heterogeneous mixture

d)

homogeneous mixture

19.

Which of these would root beer be classified as?

a)

element

b)

compound

c)

heterogeneous mixture

d)

homogeneous mixture

20.

Which of these would sodium bicarbonate (baking soda) be classified as?

a)

element

b)

compound

c)

heterogeneous mixture

d)

homogeneous mixture

21.

Which of these would stainless steel be classified as?

a)

element

b)

compound

c)

heterogeneous mixture

d)

homogeneous mixture

22.

Which of these would salt water be classified as?

a)

element

b)

compound

c)

heterogeneous mixture

d)

homogeneous mixture

23.

More than one atom bonded together to form a substance (e.g., oxygen – O2)

a)

reactant

b)

catalyst

c)

molecule

d)

isotope

24.

Chemicals combining to cause new substances to be formed.

a)

chemical change

b)

physical change

c)

catalyst

d)

products

25.

A chemical that makes a chemical reaction happen faster.

a)

oxygen

b)

product

c)

catalyst

d)

reactant

26.

Substances that are combined to form products in a chemical reaction.

a)

molecules

b)

reactants

c)

products

d)

oxidation

27.

The result of substances being combined in a chemical reaction.

a)

catalyst

b)

solution

c)

product

d)

reactant

28.

A change in state of matter where no new substance is formed.

a)

chemical change

b)

rate of change

c)

physical change

d)

oxidation

29.

A compound is broken down into its separate parts. (2H2O2-->2H2O+O2)

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

30.

The atoms/ions in two compounds are switched, creating all new compounds.

(3ZnS+2AlP-->Zn3P2+Al2S3)

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

31.

An element’s place in a compound is taken by another element.

(2Al+Fe3N2-->2AlN+3Fe)

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

32.

Two or more reactants are combined to create a more complex product.

(2Na+Cl2-->2NaCl)

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

33.

Identify the correct coefficients:

__C3H8+__O2-->__CO2+__H2O

a)

1, 5, 3, 4

b)

2, 3, 5, 4

c)

1, 3, 4, 5

d)

1, 2, 3, 4

34.

Identify the correct coefficients:

__C6H12O6+__O2-->__H2O+__CO2

a)

2, 6, 4, 2

b)

1, 6, 6, 6

c)

1, 6, 6, 4

d)

1, 4, 4, 6

35.

This subatomic particle of an atom has a NEGATIVE charge

a)

electron

b)

neutron

c)

proton

d)

isotope

36.

This subatomic particle of an atom has no charge

a)

electron

b)

neutron

c)

proton

d)

isotope

37.

Anything that has mass and takes up space.

a)

volume

b)

matter

c)

molecule

d)

solid

38.

The basic unit of an element, this makes up all matter.

a)

atom

b)

proton

c)

atomic number

d)

isotope

39.

Repeating horizontal rows of the periodic table that demonstrate patterns of how elements are arranged, specifically number of electron shells, are called _____________.

a)

groups

b)

families

c)

periods

d)

metalloids

40.

Elements arranged in vertical columns of the periodic table that share the same properties are called _____________.

a)

groups

b)

families

c)

periods

d)

metalloids

41.

An isotope is an atom of an element that is either missing or has extra _____________.

a)

protons

b)

neutrons

c)

electrons

d)

electron shells

42.

In a chemical reaction, the number of atoms in the combined reactants must equal the number of atoms in the combined products. This is an example of what?

a)

Properties of Elements

b)

Newton's Laws of Motion

c)

Law of Conservation of Matter

d)

The Rutherford Experiment

43.

The difference between a physical and a chemical change is that a chemical change produces ______________.

a)

ions

b)

a new substance

c)

oxygen

d)

a compound

44.

To prove that a chemical change has taken place, you should test the _________ of the substance at the end of your experiment?

a)

atomic mass

b)

nucleus

c)

properties

d)

reactivity

45.

Which of these are things you might see that would show a chemical change is taking place?

a)

temperature change

b)

change in state of matter

c)

vaporization (forming of a gas)

d)

evaporation

46.

d=mvd=\frac{m}{v}  is the formula used to calculate what?

a)

volume

b)

decomposition

c)

density

d)

mass

47.

A(n) ________ is a pure substance that can chemically be broken down.

a)

element

b)

compound

c)

mixture

d)

isotope

48.

Two or more substances combined physically (not chemically) and can be separated through physical means.

a)

compound

b)

molecule

c)

mixture

d)

pure substance

49.

A mixture that has a constant composition and appears the same throughout is considered to be _____________.

a)

heterogeneous

b)

homogeneous

c)

reactive

d)

a solid

50.

Characteristics of elements that help to identify what they are.

a)

periods

b)

groups

c)

properties

d)

isotopes