Chemical Reactions

Which type of reaction takes place in the presence of oxygen and produces carbon dioxide and water?

• double replacement 
• decomposition 
• combustion 
• single replacement

Tags

NGSS.MS-PS1-2

Provides evidence that a chemical reaction has occurred. 

• dissolving 
• melting
• formation of a gas
• bending

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A compound is reacted and forms two new substances. What type of reaction is this? 

• combustion 
• synthesis 
• decomposition 
• single replacement 

Tags

NGSS.MS-PS1-2

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

___________________ are the elements are compounds that leave (are formed in) a chemical
reaction.

• Polymers
• Bonds
• Reactants
• Products

Tags

NGSS.MS-PS1-5

Why are chemical equations always balanced? Select ALL that apply.

• Matter cannot be created.

• Matter cannot be destroyed.

• Matter can only be rearranged/conserved.

• Matter doesn't matter.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In a chemical reaction, if the reactants are heated, the reaction usually happens

• slower

• faster

• at the same rate

• in a smaller volume

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Some chemical reactions require a substance called a catalyst. The purpose of a catalyst is

• to warm up the reaction

• to speed up the reaction

• to create more reactants

• to stop the reaction

Tags

NGSS.MS-PS1-2

What does it mean for a reaction to be endothermic? Choose 2 of the following.

• When two substances react, the temperature of the mixture decreases.

• When two substances react, the temperature of the mixture increases.

• There is less energy going into the reactant to break the bond than there is energy leaving the product.

• There is more energy going into the reactant to break the bond than there is energy leaving the product.

• The amount of energy entering and leaving is the same.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4