Chemistry Test Review

Question 1

What are the 6 main ideas of the particle theory?

Answer 1

1) Matter is made up of tiny particles
2) Particles of matter are in constant motion
3) Particles of matter are held together
4) There are empty spaces between the particles of matter
5) All particles of one substance are identical. .
6) Temperature affects the speed of the particles.

Question 2

What is physical property?

Answer 2

A physical property is an aspect of matter that can be observed or measured without changing it.

Question 3

What is chemical property?

Answer 3

A chemical property may only be observed by changing the chemical identity of a substance.

Question 4

What is lustre?

Answer 4

The glowy appearance of a substance

Question 5

What is boiling point?

Answer 5

when a liquid substance transitions into a gas

Question 6

What is magnetic?

Answer 6

the attractivity of metal to an object

Question 7

What is melting point?

Answer 7

the transition point of a solid substance to a liquid.

Question 8

What is density?

Answer 8

the measure of how compact the mass is in a substance or object

Question 9

What is malleability?

Answer 9

the ability to be shaped into something else without breaking

Question 10

What is clarity/transparency?

Answer 10

the transparency of a substance

Question 11

What is Ductility?

Answer 11

the ability to be bent into a wire like shape

Question 11

what is reactivity with oxygen?

Answer 11

how a substance reacts to oxygen

Question 12

what is reactivity with acids?

Answer 12

the ability of a substance to under go chemical reactions when exposed to acids

Question 13

What is combusibility?

Answer 13

the measure of ease in which a substance bursts into flame

Question 14

What factors affect the density of a substance?

Answer 14

the state of matter, temperature, and pressure

Question 15

If the mass and volume are given to you, can you find out if the object will sink or float?

Answer 15

yes
M>V = sink M<V = float

Question 16

What test can be used to identify hydrogen gas?

Answer 16

a lighted splint is brought near the gas, and if hydrogen is present, it will burn with a characteristic “squeaky pop” sound

Question 17

What test can be used to identify oxygen gas?

Answer 17

you can use the glowing splint test: a glowing splint (a piece of wood with glowing embers) will relight when introduced into a test tube containing oxygen

Question 18

What tests can be used to identify carbon dioxide gas?

Answer 18

you can use the limewater test, where bubbling the gas through lime water (a solution of calcium hydroxide) will turn the limewater cloudy or milky due to the formation of a white precipitate of calcium carbonate

Question 19

What is a physical change?

Answer 19

a visible change in appearance of a substance but stays the same substance as before

Question 20

What is chemical change?

Answer 20

a change of substance/material from before

Question 21

What are the signs of physical change?

Answer 21

change in colour, temperature, and odor

Question 22

What are the signs of chemical change?

Answer 22

properties changed, 1+ new substances are formed, and a material changes into another

Question 23

What is the difference between physical and chemical change?

Answer 23

physical change is easily reversed and chemical change is rarely able to be reversed.

Question 24

What is the mass of protons, neutrons, and electrons?

Answer 24

Protons - 1 Neutrons - 1 Electrons - 0

Question 25

Does the atomic number change when protons, neutrons, electrons are added?

Answer 25

Protons - Yes Neutrons - Yes Electrons - No

Question 26

Do protons, neutrons, and electrons change the substance/element when added?

Answer 26

Protons - Yes Neutrons - Yes Electrons - No

Question 27

What is a pure substance?

Answer 27

A type of matter which cannot be separated by physical means that contains one type of particles.

Question 28

What is a mixture?

Answer 28

A type of matter which can be separated by physical means that contains 2 or more types of particles.

Question 29

What is the difference between an element and a compound?

Answer 29

An element is created from one type of atom. A compound is made from two or more elements

Question 30

Identifying the group number will help find out what about an atom?

Answer 30

the number of valence electrons/ dots on the outer ring

Question 31

Identifying the period number will help find out what about an atom?

Answer 31

the number of orbital shells an atom has

Question 32

What group number are halogens found in?

Answer 32

Group 17

Question 33

What group number are Alkali Metals found in?

Answer 33

Group 1 except Hydrogen

Question 34

What group number are Alkaline Earth Metals found in?

Answer 34

Group 2

Question 35

What group number are Noble Gases found in?

Answer 35

Group 18

Question 36

What is a chemical formula?

Answer 36

a chemical formula shows the elements that make up the compound and the numbers of atoms for each element

Question 37

What are the five rules of writing chemical formulas?

Answer 37

1) Write the symbol of the cation on the left and the symbol of the anion on the right. 2) Write the charge of each ion by the upper right of each symbol. 3) Cross the charges, IGNORING the signs. 4) Reduce the number to the "lowest common factor". 5) If the number beside an element is 1, do NOT write it.