exam chapter 8

Question 1

A small whole number that appears in front of a formula in a chemical equation

Answer 1

coefficient

Question 2

the use of a double arrow in a chemical equation indicates that the reaction is

Answer 2

reversible

Question 3

in a chemical equation, the symbol “aq” indicates that the substance is

Answer 3

dissolved in water

Question 4

the production of a slightly soluble compound in a double replacement reaction results in the formation of a

Answer 4

precipitate

Question 5

in a chemical equation, the symbol “l” indicates that the substance is

Answer 5

a liquid

Question 6

to balance a chemical equation, it is permissible to adjust the

Answer 6

coefficients

Question 7

in a reaction, the ions of two compounds exchange places in aqueous solution to from new compounds. this reaction is called

Answer 7

double-deplacement reaction

Question 8

the decomposition of a substance by an electric current

Answer 8

electrolysis

Question 9

A + X = AX

Answer 9

synthesis

Question 10

AX = A + X

Answer 10

decomposition

Question 11

A + BC = AC + B

Answer 11

single displacement

Question 12

AB + CD = AD + CB

Answer 12

double displacement

Question 13

what are three observations that indicate a chemical change may be taking place

Answer 13

evolution of energy as heat or light
color change
production of gas

Question 14

the complete combustion of a hydrocarbon in excess oxygen yields the products

Answer 14

water and carbon dioxide