Mod. 5

Question 1

binary compounds

Answer 1

compounds made of only 2 elements

Question 2

polyatomic ions

Answer 2

a covalently bonded group of atoms that has a positive or negative charge and acts as a unit.

Question 3

transition elements

Answer 3

elements whose numb. of valence electrons varies.

Question 4

molecular compound

Answer 4

compound formed when atoms share electrons in covalent bonds.

Question 5

synthesis reaction

Answer 5

reaction where 2+ subs react and form 1 compound

Question 6

decomposition reaction

Answer 6

reaction where a compound is broken down into 2+ subs

Question 7

single replacement reaction

Answer 7

reaction where 1 element takes the place of another element in the compound.

Question 8

double replacement

Answer 8

reaction where 2 compounds exchange positive ions and form new compounds

Question 9

combustion reaction

Answer 9

reaction where the reactants always contain oxygen, and the products are always carbon dioxide and water.

Question 10

Avogadro’s numb.

Answer 10

6.02 x 10^23 particles

Question 11

what is a mole

Answer 11

a mole is Avogadro’s number

Question 12

bond energy

Answer 12

a measure of how strong the bond is

Question 13

exothermic reaction

Answer 13

energy is released

Question 14

endothermic reaction

Answer 14

energy is absorbed

Question 15

catalyst

Answer 15

subs. that speeds up reaction but isn’t part of it