6.1 + 6.2

Question 1

what is a chemical change?

Answer 1

a substance is converted to a new substance

Question 2

how does one recognize a chemical change? (4 signs)

Answer 2

change in color,
formation of solid,
formation of bubbles,
heat is produced/absorbed

Question 3

chemical reaction

what is produced and how?

Answer 3

produces new substances by rearrangement of atoms

Question 4

chemical equations show us

Answer 4

the reactants and products

Question 5

types of chemical reactions (5 types)

Answer 5

1. synthesis/combination
2. decomposition
3. single replacement
4. double replacement
5. combustion

Question 6

combination reaction

Answer 6

two or more elements combine to form one product

Question 7

decomposition reaction

Answer 7

one element breaks into 2 or more simpler substances

Question 8

single replacement reaction

Answer 8

one element takes place of an element on the reacting compound

Question 9

double replacement reaction

Answer 9

two positive ions switch place

Question 10

combustion reaction

Answer 10

carbon containing compound (the fuel) reacting with oxygen to produce water and carbons dioxide and energy in form of heat