Unit 3:Chemical Reactions

Chemical Reactions

100

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

What is/are products?

200

hydrogen + oxygen →  water

Where are the reactants and products in this chemical reaction?

Reactants: hydrogen and oxygen

Products: Water

300

How many Carbons are there in NaHCO₃?

1

400

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

subscript

500

How many oxygen are in 2C6H8O7 

14

Chemical Reactions II

100

What are the two parts of a chemical reaction?

Reactants and products

200

In the formula 5CaSO₄,how many oxygen atoms do we have?

20

300

What type of reaction does this show:

 A + B →  AB?

Synthesis

400

What are the two products that always come from a combustion reaction?

CO₂ and H₂O

500

The atomic number for an element is at the top of the box for that element on the periodic table. What element has the atomic number 83?

Bismuth

Chemical Reactions III

100

A substance that enters a chemical reaction is called this.

 a reactant

200

Is the following example a compound or element?

CaCl₂

Compound

300

How many Aluminum atoms do we have in the products?

Al + O₂  →  Al₂O₃

2

400

Is this a balanced or not balanced equation?

H₂S + NaCl →  HCl + Na₂S

Not balanced

500

All of the following are examples of chemical change except:

Increase in temperature, release of light, formation of a solid, melting of ice

melting of ice

Chemical Reactions IV

100

When balancing an equation, these numbers can be changed.

a coefficent

200

How is CO₂ different from CO?

CO₂ has 1 Carbon and 2 Oxygen

CO has 1 of both Carbon and Oxygen

300

What element has the symbol, or the abbreviation, "W"?

Tungsten

400

On the periodic table, what is the number at the bottom of every element's box called?

The atomic mass (how many protons and neutron's are in that element)

500

What two things can never happen to atoms in a chemical reactions?

Atoms cannot be created or destroyed in a chemical reaction

Chemical Reactions V

100

What is it called when both sides of a chemical equation have equal numbers of each element?

Balanced

200

What is it called when both sides of a chemical equation do not have equal numbers of each element?

unbalanced

300

State the Law of Conservation of Mass.

matter can not be created nor destroyed, just rearranged 

400

Is this equaction a balanced or not balanced chemical equation?

P₄ + O₂ →  P₄O₆

Not balanced

500

How is phase change different from a chemical reaction?

During phase change the atoms only change their freedom of movement.

During chemical reactions the atoms rearrange to form new substances.