Unit 2 Notes 6

Question 1

Exothermic

Answer 1

Give off heat

Question 2

Endothermic

Answer 2

take in heat

Question 3

Chemical Rxns

Answer 3

A chemical rxn involves the rearrangement of elements /ions to form new cmpds.

Question 4

Signs of Chemical Rxns

Answer 4

1. Colour change
2. Gas given off
3. Light given off
4. Change in temp
5. Percipitate (PP+) forms (solid)

Question 5

Law of Conservation Mass

Answer 5

• mass of reactants = mass of products
• the # of atoms of each element must be the same on both sides of the equation

Question 6

What is a mole

Answer 6

6.02 X 10^23

Question 7

1 st Triangle

Answer 7

atoms,

                 molecules 
      mole                    avo #                                                              (.                              6.02X10^23

Question 8

Atomic Mass

Answer 8

• the mass of 1 mol of atoms for each element.
  eg. H = 1.01g/mol
  C= 12.01g/ mol

Question 9

Relative Mass

Answer 9

the mass of one object compared to the mass of another object.

Question 10

Molar Mass

Answer 10

• the mass of 1 mole of a cmpd/molecule
• determined by adding the atomic mass of the elements in the cmpd/molecule

Question 11

2nd Triangle

Answer 11

mass
molar mass mol