4- intro to reactions

Question 1

evidence of a chemical reaction

Answer 1

change in colour
energy released/absorbed
gas produced
precipitate forms

Question 2

precipitate

Answer 2

solid produced as a result of a reaction

Question 3

chemical reaction

Answer 3

a process in which a substance changes into another substance

Question 4

catalyst

Answer 4

a substance that makes a reaction occur faster without being used up

Question 5

law of conservation of mass

Answer 5

during a chemical equation, total mass of reactants = total mass of products

Question 6

synthesis reaction def

Answer 6

two reactants combine to make a larger or more complex product

Question 7

decomposition reaction def

Answer 7

larger/more complex compound breaks down to form two or more simpler products

Question 8

single displacement reaction def

Answer 8

an element displaces another element in a compound, producing a new compound and a new element

Question 9

activity series

Answer 9

a list of elements arranged in order of their observed reactivity in single displacement reactions

Question 10

halogen activity series

Answer 10

group 17 in the periodic table (goes in the same order from top 2 bottom)

Question 11

double displacement reaction def

Answer 11

elements in two compounds trade places/switch, making two new compounds

Question 12

solution

Answer 12

a homogenous mixture of two or more substances

Question 13

solute

Answer 13

the substance that dissolves in a solvent

Question 14

solvent

Answer 14

the stuff that is doing the dissolving

Question 15

solubility def

Answer 15

the quantity of a solute that dissolves in a given quantity of solvent at a given temperature

Question 16

neutralization reaction def (type of double displacement)

Answer 16

reaction of an acid and a base in which the resulting solution has a pH closer to 7 than either of them