Chemical Reactions Review Matter and Energy

Chemical Reactions 1

100

One of the following is a chemical change, NOT a physical change: splitting wood, melting ice, burning wood or dissolving salt in water.

What is burning wood?

200

In a chemical reaction the substances to the right of the arrow are called this/these?

What is/are products?

300

When balancing an equation this type of number CAN be changed (hint - it's can be seen as a large number at the front of the chemical formula)

What is a coefficient?

400

When balancing an equation, these numbers can not be changed.

What is a subscript?

500

Cu + ZnSO₄ →

no rxn

Chemical Reactions 2

100

In the formula 5CaSO₄, this is the number of oxygen atoms.

What is 20?

200

AgNO₃+NaCl→AgCl+NaNO₃ is an example of what type of chemical reaction? 

What is double replacement? 

300

Balance the following chemical reaction:

H₂ + NaCl --> HCl + Na

H₂+ 2NaCl --> 2HCl + 2Na

400

A solid that forms from a solution during a chemical reaction.

What is a precipitate?

500

What type of chemical reaction is

 Mg+ HCL➡️MgCl₂ + H₂?

What is single replacement?

Chemical Reactions 3

100

A substance that enters a chemical reaction is called this.

What is a reactant?

200

This type of change occurs when a substance or multiple substances rearrange and a new substance is created.

What is a chemical change?

300

An expression in which symbols and formulas are used to represent a chemical reaction.

A chemical equation

400

An increase in temperature will usually cause the rate of reaction to ________________.

What is increase?

500

AgNO₃ (aq) + NaCl (aq) → ?

AgCl (s)+ NaNO₃(aq)

Chemical Reactions 4

100

A reaction that releases thermal energy is called this.

What is exothermic?

200

A chemical reaction in which thermal energy is absorbed.

What is endothermic?

300

NaNO₃ (aq)+ KCl(aq) → ?

No rxn

400

 2HgO ---> 2Hg + O

 is an example of this type of reaction.

What is decomposition?

500

Balance the reaction:

Na +H₂O -> NaOH + H₂

What is 2Na + 2H₂O ->2NaOH + H₂

Chemical Reactions 5

100

This type of change in a substance's appearance is not a chemical change and is usually reversible.

What is a physical change?

200

A molecule consisting of two atoms. Ex: O₂ or H₂

What is a diatomic molecule?

300

State the Law of Conservation of Mass.

What is "matter can not be created or destroyed in a chemical reaction"?

400

What is the activity series?

The activity series is a list of metals (and some nonmetals) arranged in order of decreasing reactivity, used to predict if a single-replacement reaction will occur.

500

This type of reaction has O₂ on the reactant side, and usually has CO₂ and H₂O on the product side.

What is a combustion reaction?