Decompositions

Choose the general equation for decomposition reaction:

• A + B → A - B

• A - B → AB

• None of the above

• AB → A + B

Fill in the missing product: 2Ni ₂O₃ → + 3O₂

• 4Ni

• Ni

• 2O

Tags

NGSS.MS-PS1-5

Hydrogen peroxide gradually decomposes to and when it is exposed to light.

• water; oxygen

• hydrogen; oxygen

• hydrogen; oxygen

• All of the above

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Decomposition reaction is the opposite of a reaction

• Synthesis

• Photosynthesis

• Combustion

• Double-replacement

Examples of decomposition include:

• 2H₂O₂ → 2H₂O + O₂

• NH₃ + H₂O → NH₄OH

• Two of the above

• 2NaCI → 2Na + CI₂

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Products of a decomposition reactions are always individual elements.

• False

• True

Which of the following chemical equation represents a decomposition reaction?

• H2SO3 → H2O + SO2

• 2K + 2H2O → 2KOH + H2

• None of the above

• Two of the above

When a reactant breaks down to form two or more products, it is an addition reaction.

• True

• False

The reaction 2AI₂O₃ → 4AI + 3O₂ is a decomposition reaction.

• True

• False

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The substances that start a chemical reaction are called:

• Reactants

• Products

• Hydrogen molecules