Chemical Reactions

A chemical change is different than a physical change because in a chemical change

• chemicals are used

• molecules do not physically touch

• a new substance is formed and in a physical no new substance is formed

• the change can be seen but in a physical change it cannot

Tags

NGSS.MS-PS1-2

Which of the following 2 are chemical reactions?

• sugar dissolving in water

• water turning into steam

• burning wood

• mixing baking soda and vinegar

• tearing paper

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

How many Carbons are present on the reactant side?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

How many Hydrogens are on the product side of this chemical equation?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-1

How many Oxygens are on the product side of this chemical equation?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

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-PS1-5

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-PS1-2

NGSS.MS-PS1-4

What does it mean for a reaction to be endothermic?

• When two substances react, the temperature of the mixture decreases because it is releasing thermal energy.

• When two substances react, the temperature of the mixture increases because it is absorbing thermal energy.

Tags

NGSS.HS-PS1-4

What does it mean for a reaction to be exothermic?

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

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

Tags

NGSS.MS-PS3-4

Is this chemical equation balanced?

• yes

• no

Tags

NGSS.MS-PS1-5