Chem test

Question 1

groups

Answer 1

vertical columns labelled 1-18

Question 2

periods

Answer 2

horizantal columns labelled 1-7

Question 3

physical change

Answer 3

same substance with altered attributes

Question 4

chemical change

Answer 4

change in which 1 or more new substamces are created

Question 5

alkali earth metals

Answer 5

never found uncombined in nature, has two valance electrons

Question 6

alkali metals

Answer 6

first column, shiny, 1 valence electron

Question 7

transition metals

Answer 7

good conductors, popular metals

Question 8

halogens

Answer 8

17th column, 7 valence electrons, most active non-metals

Question 9

noble gasses

Answer 9

extremely unreastive, full outer orbit, dont combine so called inert

Question 10

rare earth metals

Answer 10

bottom of the periodic table

Question 11

cation

Answer 11

ions with a postive charge

Question 12

anion

Answer 12

ions with a negative charge

Question 13

valence electrons

Answer 13

electrons found in the outermost orbit, electrons involved in sharing or combining

Question 14

ionic bonds

Answer 14

the complete tranfer of electrons from one atom to another

Question 15

covalent bonds

Answer 15

the sharing of one or more pairs of electrons

Question 16

diatomic elements/molecules

Answer 16

2 atoms of the same type form a stable covalent molecule. (HOFBrINCl)

Question 17

reactant

Answer 17

what you start with in a chemical equation

Question 18

product

Answer 18

what you end up with

Question 19

law of conservation of mass

Answer 19

the mass of the reactants needs to be equal to the mass of the products

Question 20

5 types of chemical reactions

Answer 20

synthesis, decompostion, double and single displacemtent and combustion

Question 21

combustion

Answer 21

reaction wher hydrocarbon burns in oxygen to produce water and carbon dioxide

Question 22

incomplete combustion

Answer 22

hydrocarbon burns in water to prodice a misture of products (not enough oxygen)

Question 23

acid

Answer 23

ph of less than 7, releases hydrogen in water

Question 24

base

Answer 24

ph of more than 7, releases hydroxide in water

Question 25

properties of an acid

Answer 25

reactive, explosive,sour tasting

Question 26

properties of a base

Answer 26

reactive, corrosive, bitter tasting

Question 27

pH

Answer 27

a measure of how acidic or basic a substance is

Question 28

neutralization reaction

Answer 28

when an acid reacts with a base to make it neutrual

Question 29

acid rain

Answer 29

when nitrogen and sulfur is released which combines with oxygen to form nitrogen oxides and sulfur dioxide

Question 30

non metallic elemants form…

Answer 30

anion

Question 31

metallic elements form…

Answer 31

cations