Chemistry Test#1 Practice Questions GR 8 Ferryway

. What is the smallest building block of matter?

• compound

• molecule

• atom

• mixtures

The nucleus of an atom contains

• protons only

• electrons only

• protons and neutrons

• neutrons and electrons

A _______________ is a combination of two or more atoms that are held together by a covalent bond

A Element

B Metal

C Ion

D Molecule

• Ion

• Molecule

• Metal

• Element

Substances that CANNOT be broken down chemically into substances are

A Compounds

B Elements

C Mixtures

D Solutions

• solutions

• mixtures

• compounds

• elements

15 Which of the following is an element?

A Sugar

B Salt

C Copper

D Water

• water

• salt

• sugar

• copper

Which choice would be a molecule?

• O

• H

• H₂

• Au

Complete the sentence that describes how elements and compounds are similar? " Elements and compounds...."

• ...are both made up of different kinds of atoms

  .

• .can both be broken down by physical change

• are both listed on the periodic table

• . are both pure substances

What type of substance is always made up of a single type of atom?

• compound

• element

• mixture

• molecule

The atomic number of nitrogen is 7. The atomic mass is 14.01. This means that:

• Some nitrogen atoms have fewer than 7 electrons

• A small percentage of nitrogen atoms have MORE than 7 neutrons

• A small percentage of nitrogen atoms have FEWER than 7 neutrons

• All nitrogen atoms have EXACTLY 7 neutrons

A water molecule is made up of one Oxygen atom and two Hydrogen atoms. Why is water considered a pure substance?

• Water can be broken apart by physical means

• Water can be combined with other substances by physical means

• Each water molecule is identical

• Water molecules are made up of different types of atoms