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Elements, Compounds, and Chemical Formulas Review

Authored by Kelly Johnston

Chemistry

7th Grade

NGSS covered

Used 15+ times

Elements, Compounds, and Chemical Formulas Review
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14 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image

Which of the following best defines an element?

A pure substance that cannot be broken down into simpler substances by a chemical reaction.

A mixture of two or more substances.

A chemical combination of two or more elements.

A number that represents the number of molecules present.

Tags

NGSS.MS-PS1-1

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image

What is a compound?

A pure substance made of only one type of atom.

A chemical combination of two or more elements.

Two or more atoms physically mixed together.

The number before a compound formula.

Tags

NGSS.MS-PS1-1

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image

Which of the following is the best description of a molecule?

A single atom of an element.

Two or more atoms chemically combined.

A mixture of compounds.

The number before a chemical formula.

Tags

NGSS.MS-PS1-1

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image

What does the coefficient in a chemical formula represent?

The type of atoms in the molecule.

The number of atoms in a molecule.

The number of molecules that are present.

The total mass of the compound.

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image

Given the chemical equation 2H₂ + O₂ → 2H₂O, how many molecules of water are produced, and what does the coefficient "2" in front of H₂O indicate? (DoK Level 3: Strategic Thinking)

2 molecules of water are produced; the coefficient "2" means there are 2 molecules of water.

1 molecule of water is produced; the coefficient "2" means there are 2 atoms of hydrogen.

2 molecules of oxygen are produced; the coefficient "2" means there are 2 atoms of oxygen.

4 molecules of water are produced; the coefficient "2" means there are 4 molecules of water.

Tags

NGSS.MS-PS1-5

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image

What does the subscript in a chemical formula represent?

The number of molecules in the reaction

The number of atoms of an element in a compound

The total mass of the compound

The charge of the element

Tags

NGSS.MS-PS1-1

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following best describes an element symbol?

A picture of the element

The full name of the element

A one or two letter representation of an element

The atomic mass of the element

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