7th Grade Chemistry Review

Which of the following is NOT true about the periodic table?

• Atomic mass is equal to the number of neutrons.

• Elements listed by their (increasing) atomic mass.

• Groups are the elements listed in columns.

• Periods are the elements listed in rows of 8 (for most rows).

Chemical properties are

• an element’s ability to react with other elements.

• an element's ability to change into a gas.

• an elements attraction to water.

• any property which can be observed or measured.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following is a compound containing more than one element?

• NaCl

• Be

• S

• Ne

Tags

NGSS.MS-PS1-1

Which of the following chemical formulas has a subscript?

1. H₂O

2. 2HCl

3. NaCl

• 1 only

• 2 only

• 3 only

• 1 and 2

Tags

NGSS.MS-PS1-1

How many oxygen atoms are in an atom of hydrogen peroxide (H₂O₂) ?

• 2

• 4

• 1

• 8

Tags

NGSS.MS-PS1-1

How many atoms are in the following chemical formula?

C₆H₁₂O₆

• 24

• 3

• 18

• 12

Tags

NGSS.MS-PS1-1

How many atoms are in the following chemical formula?

2CaCO₃

• 10

• 8

• 4

• 5

Tags

NGSS.MS-PS1-1

What is the atomic number of the atom?

• 6

• 12

• 18

• 3

Tags

NGSS.MS-PS1-1

What is the atomic number of the following atom?

• 20

• 40

• 60

• 10

Tags

NGSS.MS-PS1-1

In chemical reactions, what does the principle of conservation of mass mean?

• Matter is not created or destroyed.
• The total mass of the reactants is greater than the total mass of the products.
• The total mass of the reactants is less than the total mass of the products.
• Matter is not changed.
  

Tags

NGSS.MS-PS1-5