Chemistry Practice Test

1.

1 point

Which statement is not part of the concept of the law of conservation of mass?

Mass is only created; it is never destroyed.

Mass cannot be created nor can it be destroyed.

Mass can change forms (solid  liquid  gas)

All chemical equations must be balanced.

2.

1 point

What represents the number of atoms each element has in a compound?

coefficients

subscripts

reactants

products

3.

1 point

How many sodium atoms are found in 2 Na H C O3?

2

1

3

0

4.

1 point

Which of the following changes is chemical rather than physical?

fireworks exploding

Pond freezing in the winter.

Pot of water boiling on the stove.

Piece of glass breaking.

5.

1 point

If one sodium atom is added to the reactant side of the equation below, how many sodium atoms should be added to the product side?

2Na 2 + O 2 --> 2Na 2 O

one

two

zero

three

6.

1 point

Three examples of chemical change are ____.

pond freezing, a nail rusting, a melting candle

boiling water, breaking glass, a burning candle

melting ice, mowing the lawn, carving a statue

a nail rusting, a log burning, baking bread

7.

1 point

What elements would you find in a mixture of sugar and salt?

sodium (Na), chlorine (Cl), Carbon (C), Hydrogen (H), Oxygen (O)

Carbon (C), Hydrogen (H), Oxygen (O), Nitrogen (N)

Chlorine (Cl), Carbon (C), Nitrogen (N), Sodium (Na), Oxygen (O)

8.

1 point

The smallest particle of matter is a _______________.

atom

element

compound

mixture

9.

1 point

The positive part of the atom is the ______________.

proton

neutron

electron

10.

1 point

Air is considered matter becaue it _________________.

takes up space and has mass

has both positive and negative charges

takes up space only

has mass and density

11.

1 point

Sulfur is a nonmetal. Which of the follwoing characteristics would you expect sulfur to have?

brittle

found on the left side of the periodic table

good heat conductor

luster

12.

1 point

Milk is composed of sugar, and water. Milk is an example of a ________________.

homogenus mixture

heterogeneous mixture

compound

element

13.

1 point

Which material would be used in wiring because of its natural
conductivity?

copper

carbon

oxygen

calcium

14.

1 point

Elements on the periodic table are arranged from left to right across each period by ______________.

increasing atomic number

alphabetical order

decreasing mass number

date of discovery

15.

1 point

You can describe an apple as being round shaped, red, and sweet tasting. All of these are _______________.

physical properties

physical changes

chemical changes

chemical properties

16.

1 point

Which of the following properties allows iron to sink when placed in water?

density

mass

volume

color

17.

1 point

When apples are exposed to air, the apples will turn brown. This brown color is evidence of a _____________.

chemical change

physical change

chemical property

physical property

18.

1 point

As the temperature drops, water in a pond will freeze. This freezing is a evidence of a _____________.

physical change

chemical change

physical property

chemical property

19.

1 point

How many carbon atoms are in sugar?

6

1

3

4

20.

1 point

When iron is left outside, iron will produce rust. What are the reactants of this chemical reaction?

iron and oxygen

iron only

iron and water

rust

21.

1 point

Elements that are similar are placed into vertical columns on the periodic table called families.

True

False

22.

1 point

A balanced chemical equation supports the law of conservation of mass because equal number of atoms shows that matter was created but not destroyed.

True

False

23.

1 point

Water is an example of a element.

True

False

24.

1 point

Ductile refers to the ability of a metal to be made into a wire.

True

False

25.

1 point

The products are always listed to the left of the arrow in a chemical equation.

True

False

26.

1 point

Protons and neutrons are found in the nucleus of an atom.

True

False

27.

1 point

Boiling water is a chemical change.

True

False

28.

1 point

The ability to burn is a slow reaction to oxygen.

True

False

29.

1 point

With a physical change, no new substance is formed because the atoms did not rearrange.

True

False

30.

1 point

Color is the best physical property to use when identifying an unknown substance.

True

False