7th Grade Chemistry Review

Front

What is the atomic number of an atom?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is the chemical formula for carbon monoxide?

Back

The chemical formula for carbon monoxide is CO.

Front

How do you determine the total number of atoms in a chemical formula?

Back

To determine the total number of atoms, add the number of atoms of each element in the formula, considering any coefficients.

Tags

NGSS.MS-PS1-1

Front

What is solubility?

Back

Solubility is the ability of a substance to dissolve in a liquid, forming a solution.

Front

What is the atomic number of carbon?

Back

The atomic number of carbon is 6.

Front

What is the atomic number of calcium?

Back

The atomic number of calcium is 20.

Front

What does the subscript in a chemical formula indicate?

Back

The subscript indicates the number of atoms of the element in the molecule.

Tags

NGSS.MS-PS1-1

Front

What is the chemical formula for calcium carbonate?

Back

The chemical formula for calcium carbonate is CaCO3.

Front

How many atoms are in the formula 2CaCO3?

Back

There are 10 atoms in the formula 2CaCO3 (2 calcium, 2 carbon, and 6 oxygen).

Tags

NGSS.MS-PS1-1

Front

What is the significance of the atomic number in the periodic table?

Back

The atomic number determines the position of an element in the periodic table and its chemical properties.