Unit 2

Question 1

When a chemical reaction has happened

Answer 1

Change in color, temp., state, sound, smell, flash of light

Question 2

Law of conservation of mass

Answer 2

Antoine Lausier

1) Mass of reactants is equal to the mass of products
2) The number of atoms you start with will be the number you finish with

Question 3

When does a double displacement reaction not happen

Answer 3

When both solutions are (aq)

Question 4

For single displacement reactions….

Answer 4

Check the activity series

Question 5

Combustion reactions

Answer 5

When a fuel burns in oxygen and produces a flame

Question 6

Complete combustion

Answer 6

CxHy+O2 —> CO2+ H2O Releases the most energy and cleanest flame

Question 7

Incomplete combustion

Answer 7

When oxygen supply is limited so CO, CO2, H2O and soot are produced

Question 8

Metal oxides +water

Answer 8

Bases

Question 9

Non metal oxides + water

Answer 9

Acids

Question 10

Very acidic

Answer 10

More hydrogen atoms

Question 11

Very basic

Answer 11

More hydroxide atoms

Question 12

pH levels

Answer 12

0-6- acidic 7- neutral 8-14- basic