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Chemical Equations
Name That Reaction
Identify That Reaction
Find Balance
I'm So Random
100

The small numbers in chemical equations are called _______________.

subscripts

100

A ______________________ chemical reaction is when two or more substances combine to form a more complex compound.

synthesis

100

2HgO → 2Hg+O2(g)

Decomposition

100

__N2 + __H2 ---> __NH3

N2 + 3H2 ---> 2NH3

100
How are physical and chemical changes different?

Physical changes don't actually change what something is, but chemical changes make it a new thing with new characteristics. Physical changes can be physically reversed, but chemical changes can't.

200

The large numbers in front of chemical equations are called ________________.

coefficients

200

In a _____________________ reaction, a substance combines with oxygen and light and heat are given off.

combustion

200

2Na+Cl2 → 2NaCl

Synthesis

200

__Al + __O2 ---> __Al2O3

4Al + 3O2 ---> 2Al2O3

200

What is a chemical reaction?

A process by which one or more substances are changed into one or more new substances with new characteristics.

300
The substances on the left side of a chemical equation are called _______________.
reactants
300

A __________________ chemical reaction is when a compound divides into two or more simpler substances.

decomposition

300

C3H8+5O2 → 3CO2+4H2O

 (light and heat are produced as well)

combusiton

300

__Al + __HCl ---> __AlCl3 + __H2

2Al + 6HCl ---> 2AlCl3 + 3H2 

300

What is the oxidation number of Sulfur?

-2

400

The substances on the right side of a chemical equation are called ________________.

products

400

In a ____________________ ________________ reaction, one element replaces another in a compound.

single replacement

400

2KI+Pb(NO3)2 → 2KNO3+PbI2

Double replacement
400

__H3PO4 + __HCl --> __PCl5 + __H2O

H3PO4 + 5HCl --> PCl5 + 4H2O

400

The Law of Conservation of __________________ tells us that matter can’t be __________________ or destroyed.

Mass; created

500

How many total atoms are in 5(NH4)2O

55

500

In a _____________________ ____________________ replacement reaction, two ionic compounds change partners.

double replacement

500

Mg+Cu(NO3)2 → Mg(NO3)2+Cu

Single replacement

500

__CO + __H2 --->__C8H18 +__H2O

8CO + 17H2 ---> C8H18 + 8H2O

500

What is the difference between a cation and an anion?

A cation has given away electrons and become positively charged; an anion has received electrons and become negatively charged.