Chem Vocab Unit 4

Question 1

molecular formula

Answer 1

chemical formula of a molecular compound that shows the kinds and number of atoms present in a molecule of the compound

Question 2

empirical formula

Answer 2

formula that shows the element in a compound in their lowest whole number ratio

Question 3

reactant

Answer 3

substance that is present at the start of the reaction

Question 4

product

Answer 4

substance that is present at the end of the reaction

Question 5

coefficient

Answer 5

small whole number placed in front of a formula in a chemical equation in order to balance it

Question 6

synthesis reaction

Answer 6

reaction where 2 or more simple elements are combined to form a more complex product

Question 7

combustion reaction

Answer 7

reaction where substance reacts with oxygen gas, releasing light and heat

Question 8

decomposition reaction

Answer 8

reaction in which a compound breaks down into 2 or more simpler substances

Question 9

double replacement reaction

Answer 9

reaction in which the positive and negative ions of 2 ionic compounds exchange places to form 2 new compounds

Question 10

exothermic reaction

Answer 10

reaction that releases heat into surroundings

Question 11

endothermic reaction

Answer 11

reaction where the heat is absorbed from surroundings

Question 12

+

Answer 12

used to separate multiple reactants or products

Question 13

–>

Answer 13

yield sign, separates reactants from products

Question 14

–>
<–

Answer 14

replaces the yield sign for reversible reactions that reach equilibrium

Question 15

(s)

Answer 15

reactant or product in the solid state

Question 16

(l)

Answer 16

reactant or product in the liquid state

Question 17

(g)

Answer 17

reactant or product in the gas state

Question 18

(aq)

Answer 18

reactant or product in an aqueous solution (dissolved in water)

Question 19

Pt
–>

Answer 19

formula written above the arrow is used as a catalyst in the reaction

Question 20

/\
—>

Answer 20

triangle indicates that the reaction is being heated