Show:
Chemical Reactions
Counting Atoms
Balancing
Types
Energy
100

How do you know a chemical reaction has taken place?

Change in physical and chemical properties

100

How many atoms are present in MgCO3?

5

100

Balance:

Na + Cl2 --> NaCl

2Na + Cl2 --> 2NaCl

100

What type of reaction is the following?

2H2 + O2 --> 2H2O

Synthesis

100

What happens to the activation energy in a reaction with catalyst?

Lowers the activation energy of a reaction so that the reaction happens more quickly.

200

Give an example of a diatomic molecule.

O2, N2, H2, etc.

200

What is the formula for carbon tetrachloride?

CCl4

200

Fe + O2 --> Fe2O3

4Fe + 3O2 --> 2Fe2O3

200

What type of reaction is the following?

2H2O --> 2H2 + O2

Decomposition

200

In this type of reaction, energy is released.

2Na + Cl2 --> 2NaCl + energy

exothermic

300

This has to happen for a chemical bond to break.

Enough energy to cause collisions with enough force to break bonds.

300

How many atoms of each element in 4NaOCl?

4Na, 4O, 4Cl

300

Mg(OH)2 + HCl --> MgCl2 + H2O

Mg(OH)2 + 2HCl --> MgCl2 + 2H2O

300

Name the type of reaction:

BaCN2 + H2SO4 -->BaSO4 + 2HCN

Double Displacement

300

How can you increase the rate of a reaction?

Increase temperature, increase concentration, increase surface area, add a catalyst

400

Name the 5 parts of the following equation:

2H2 + O2 --> 2H2O

coefficient subscript reactants yield product

400

How many atoms of each element in Fe(NO3)2?

1Fe, 2N, 6O

400

Balance the following equation:

Mg + N2 --> Mg3N2

3Mg + N2 --> Mg3N2

400

Name the type of reaction:

Zn + 2HCl --> ZnCl2 + H2

Single displacement

400

Photosynthesis requires energy:

6CO2 + 6H2O + energy --> C6H12O6 + O2

endothermic

500

Why do chemical equations have to be balanced?

Because conservation of mass means that matter cannot be created or destroyed which means that every atom must be accounted for in both the reactants and the products.

500

How many atoms of each element in 2Al2(CO3)3?

4Al, 6C, 18O

500

Ba(CN)2 + H2SO4 --> BaSO4 + HCN

Ba(CN)2 + H2SO4 --> BaSO4 + 2HCN

500

C6H12O6 + 6O2 -->6CO2 + 6H2O + energy (respiration) is what type of reaction?

Combustion

500

Preservatives and antibiotics are substances that slow down reactions and called this.

Inhibitors