gr. 9 chem

Question 1

particle theory

Answer 1

• all matter is composed of particles
• the particles are in constant motion
• in between particles is empty space
• when heat is added, particles speed up

Question 2

atom

Answer 2

single particle from the periodic table

Question 3

molecule

Answer 3

more than 1 atom bonded together

Question 4

pure substance

Answer 4

only 1 type of particle

Question 5

mixture

Answer 5

more than one type of particle

Question 6

element

Answer 6

consists of only one type of atom

Question 7

compound

Answer 7

consists of two or more kinds of atoms

Question 8

solution

Answer 8

homogeneous

Question 9

mechanical mixture

Answer 9

heterogeneous

Question 10

physical property

Answer 10

a description of a substance that doesn’t involve the forming of a new substance

Question 11

chemical property

Answer 11

a description of what happens when a substance is forming a new substance

Question 12

physical change

Answer 12

a change in which the substance changes form but not chemical composition

Question 13

chemical change

Answer 13

a subsistence is altered at the molecular level, creating a new chemical substance

Question 14

oxygen test

Answer 14

• lowering a splint into test tube
• splint relights

Question 15

hydrogen test

Answer 15

• lowering a burning splint into a test tube
• splint pops

Question 16

carbon dioxide test

Answer 16

• add like water to test tube
• turns cloudy

Question 17

water vapour

Answer 17

• touch to blue cobalt chloride paper
• paper turns pink

Question 18

dalton

Answer 18

developed a theory that uses the idea that elements are different because their atoms are different

Question 19

thomson

Answer 19

discovered the negative electron by studying cathode rays

Question 20

rutherford

Answer 20

concluded atoms have a tiny dense core that is positive

Question 21

bohr

Answer 21

concluded electrons don’t spiral inward and crash into the nucleus because they’re in fixed regions called energy levels, around the nucleus

Question 22

proton

Answer 22

• p^+
• +1 relative charge
• 1u mass
• located in nucleus

Question 23

electron

Answer 23

• e^-
• -1 relative charge
• 0u mass
• orbits nucleus

Question 24

neutron

Answer 24

• n^0
• 0 relative charge
• 1u mass
• located in nucleus

Question 25

what does atomic number tell you?

Answer 25

the number of protons and electrons

Question 26

how to determine the number of neutrons in each atom

Answer 26

mass# - atomic#

Question 27

standard notation

Answer 27

ELEMENT mass# over atomic#

Question 28

ion

Answer 28

a charged ion

Question 29

metals

Answer 29

left side of staircase (on PD)

Question 30

non-metals

Answer 30

right side of staircase (on PD)

Question 31

ionic bond

Answer 31

• metal + non-metal
• transferring of e^-

Question 32

covalent bond

Answer 32

• non-metal + non-metal
• sharing of e^-