Chemical reactions – precipitation, decomposition

Which gas is released when a metal reacts with an acid?

• Hydrogen

• Oxygen

• Carbon dioxide

• Nitrogen

Which of the following models best demonstrates a balanced chemical equation?

• F
• G
• H
• J

Tags

NGSS.MS-PS1-5

The reactants are on the left side of the chemical equation.

• True
• False

Tags

NGSS.MS-PS1-5

In a ___________change, a substance changes into a different substance.

• Physical

• Chemical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The Law of Conservation of Mass states

• that matter exists in all states and reacts the same

• that matter can only be changed into new substances by introducing a catalyst

• that matter exists in the same state throughout any chemical change

• that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

Tags

NGSS.MS-PS1-5

Which reaction type is the following: C₅H₁₀ + O₂ --> CO₂ + H₂O

• Decomposition
• Synthesis
• Combustion
• Double Replacement

Which of the following is a sign that a chemical reaction has occurred?

• change in shape
• melting
• formation of a gas
• dissolving

Tags

NGSS.MS-PS1-2

What term is given to a reaction which transfers heat energy to the surroundings?

• Endothermic

• Reversible

• Exothermic

• Exotermic

Tags

NGSS.MS-PS1-6

NGSS.MS-PS3-4

NGSS.MS-PS3-5

What type of chemical reaction absorbs energy and requires energy for the reaction to occur?

• Endothermic

• Exotermic

• Exothermic

• Endotermic

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

A common chemical reaction in plants.

• photosynthesis
• photographer
• alkali metals
• halogens