10th Grade

In a covalent bond, electrons are:

• Transferred

• Shared

• Lost

• Gained

In a chemical equation, the arrow (→) represents:

• Dissolves in

• Reacts with

• Yields

• Decomposes to

The chemical equation 2H2 + O2 → 2H₂O represents the formation of _____.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

In a chemical equation, the substances on the left side of the arrow are called:

• Products

• Reactants

• Catalysts

• Yields

Which of the following is NOT a state symbol used in chemical equations?

• (s)

• (l)

• (g)

• (m)

In a balanced chemical equation, the number of _____ must be the same on both sides.

Tags

NGSS.MS-PS1-5

Which of the following equations is already balanced?

• H2 + O2 → H2O

• 2H2 + O2 → 2H2O

• H2 + 2O2 → H2O

• 2H2 + O2 → H2O

Tags

NGSS.MS-PS1-5

To balance an equation, you can change the:

• Subscripts

• Coefficients

• Chemical formulas

• Arrow direction

In the unbalanced equation ___Fe + ___O₂ → ___Fe₂O₃, the coefficients needed to balance it are:

Tags

NGSS.MS-PS1-5

The balanced equation for the reaction between hydrogen and nitrogen to form ammonia is:

• H2 + N2 → NH3

• 3H2 + N2 → 2NH3

• 2H2 + N2 → NH3

• H2 + 3N2 → 2NH3

Tags

NGSS.MS-PS1-5