Compounds & Molecules (Difficult)

Compounds & Molecules (Difficult)

8th Grade

15 Qs

quiz-placeholder

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Compounds & Molecules (Difficult)

Compounds & Molecules (Difficult)

Assessment

Quiz

8th Grade

Hard

Created by

Virginia Byard

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15 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Hydrogen is a pure substance represented by the chemical symbol H. Which of the following best describes hydrogen?

Hydrogen is an element made of two or more kinds of atoms.
Hydrogen is a compound made of only one kind of atom.
Hydrogen is a compound made of two or more kinds of atoms.
Hydrogen is an element made of only one kind of atom.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The element oxygen, represented by the symbol O, is classified as

a pure substance
a compound
a mixture
a solution

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Carbon (C) and hydrogen (H) are pure substances. Each is made of only one type of atom, but carbon atoms are different from hydrogen atoms. Carbon and hydrogen chemically combine to form methane (CH4).

methane is an element and carbon and hydrogen are compounds.
carbon, hydrogen, and methane are all elements.
carbon, hydrogen, and methane are all compounds.
carbon and hydrogen are elements and methane is a compound.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a compound?

an atom with more electrons than protons
a substance in which the atoms of two or more elements are combined together
an atom with more neutrons than protons
a substance in which the atoms of three or more elements are combined together

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The chemical combination of two or more different kinds of atoms in fixed amounts is called a(n)

orbit
compound
mixture
element

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Atoms combine to form _______. 

electrons
molecules
nuclei
neutrons

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A compound is...

a substance made up of one type of atom in its molecular form.
a substance formed by the reaction of two or more elements.
a mixture formed by the mixing of two or more elements.
a substance made up of one type of atom in its atomic form.

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