Chemistry Review (EL #4)

Which of the following is a compound?

• Ne

• Na

• NaHCO₃

• N

Tags

NGSS.MS-PS1-1

Is C₂H₄O₂ a compound or element?

• Compound

• Element

Tags

NGSS.MS-PS1-1

Which of the following is the correct balanced equation for the decomposition of Mercury(II) oxide?

• HgO → Hg + 2O₂

• 2HgO → Hg + O₂

• HgO → 2HgO₂

• 2HgO → 2Hg + O₂

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the chemical formula for the molecule represented in the image?

• HO

• H₂O

• H₂O₂

• HO₂

Tags

NGSS.MS-PS1-5

Where does a coefficient belong in a chemical equation (if needed)?

• In the middle of a compound or formula as needed.

• In the front of a formula or compound as needed.

• It can be placed anywhere in a chemical equation.

• It goes behind a chemical formula as needed.

Balance the equation: ( Na + O₂ -> Na₂O ) When balanced, how many total atoms are in the reactants?

• 7

• 9

• 6

• 3

Tags

NGSS.MS-PS1-5

Ammonia, ( NH₃ ), is an example of a(n):

• Mixture

• Atom

• Element

• Compound

Tags

NGSS.MS-PS1-1

What does the image represent?

• Atom

• Molecule

• Compound

• Heterogeneous mixture

Tags

NGSS.MS-PS1-1

What does the image represent?

• Atom

• Molecule

• Compound

• Element

Tags

NGSS.MS-PS1-1

What does the image represent?

• Atom

• Molecule

• Compound

• Homogeneous mixture

Tags

NGSS.MS-PS1-1