Chemistry

Question 1

What is matter

Answer 1

Anything that has mass or takes up space

Question 2

What are physical properties

Answer 2

Characteristics of matter that can be observed or measured without changing its chemical identity

Question 3

What is the melting point

Answer 3

The temperature at which a substance changes from a solid to a liquid state

Question 4

What is boiling point

Answer 4

The temperature at which a substance changes from a liquid to a gaseous state

Question 5

What is malleability

Answer 5

Describes how easily a substance can be hammered or bent into different shapes

Question 6

What is hardness

Answer 6

Describes the resistance of solid to being scratched or dented

Question 7

What are 7 physical properties

Answer 7

Melting point, boiling point, malleability, hardness, solubility, viscosity, and density

Question 8

What is a chemical property

Answer 8

Ability of matter to react with another substance to form one or more new substances. They can only be observed when a substance chemically interacts with another substance

Question 9

What are the chemical properties

Answer 9

Reactivity with acids, reactivity with oxygen, combustibility, lack of reactivity

Question 10

What is reactivity with acids

Answer 10

How a substance reacts when exposed to other acids eg:baking soda and vinegar produce gas

Question 11

What is reactivity with oxygen

Answer 11

How a substance reacts when exposed to oxygen Eg;avocados turning brown

Question 12

What is combustibility

Answer 12

The ability of a substance to catch fire Eg:wood

Question 13

What is lack of reactivity

Answer 13

Substances that do not react with other substances are “inert” Eg: helium in a balloon

Question 14

What are physical changes

Answer 14

changes in matter that do not change it’s chemical identity Eg:freezing water

Question 15

What are chemical changes

Answer 15

Changes in matter that produce one or more new substances Eg:toasting bread

Question 16

What is quantitative data

Answer 16

Data described with numbers

Question 17

What is quantitative data

Answer 17

Data described in number

Question 18

What is density

Answer 18

Density is the amount of mass for each unit of space it occupies.

Question 19

When fluids that do not mix are put into the same container, what substance floats to the top

Answer 19

The less dense substance floats to the top

Question 20

How do u calculate the density

Answer 20

Mass/volume

Question 21

What are the states of matter

Answer 21

Solid, liquid, gas, plasma

Question 22

How do particles behave when they change state

Answer 22

-Changes in state occur when matter transforms from one state to another
-when temperature increases particles gain energy and move faster and farther apart
-temperature is the measure of average kinetic energy of particles in a substance
-once the matter reaches a certain temperature, the particles have gained enough energy to change state
-diffusion is the movement of particles from an area of high concentration to low concentration
-solids, liquids, and gasses expand when heated and contract when cooled

Question 23

What is the change of state in: melting

Answer 23

Solid to liquid state

Question 24

What is the change of state in; freezing

Answer 24

Liquid to solid state

Question 25

What is the change of state in: evaporation/vaporization

Answer 25

Liquid to gas state

Question 26

What is the change of state in: Condensation

Answer 26

Gas to liquid state

Question 27

What is the change of state in: Deposition

Answer 27

Gas to solid state

Question 28

What is the change of state in: Sublimation

Answer 28

Solid to gas state

Question 29

What is the KMT

Answer 29

The theory that matter is always moving

Question 30

What does the KMT state (4pts)

Answer 30

-in a solid, particles are very close together and only vibrate. They attract one another strongly in a rigid structure -in a liquid, the particles are very close together but can still move. They slip and slide but stay together. They attract each other less strongly than solid - in a gas, particles are very far apart and move randomly and quickly in straight lines. They do not have attraction to each other -gas has the most energy, solids have the least

Question 31

What are protons, neutrons, and electrons

Answer 31

An atom consists of electron shells and a nucleus Protons and neutrons exist in the nucleus Electrons exist in the electron shells

Question 32

What are protons, neutrons and electrons charge, and where can they be found

Answer 32

Name, Symbol, electrical charge, location in the atom Protons, p+, positive, nucleus Neutrons, n0, neutral, nucleus E-, negative, electron shell

Question 33

What are atoms

Answer 33

Made up of nucleus (protons and neutrons)

Question 34

How many ē can go into each shell

Answer 34

1st shell- 2ē 2nd shell- 8ē 3rd shell- 18ē 4th shell- 32ē

Question 35

What is the atomic number

Answer 35

How many protons are in the nucleus

Question 36

What is the atomic mass

Answer 36

How many protons and neutrons make up the nucleus

Question 37

What way does a group (families) go

Answer 37

Horizontally (across)

Question 38

What way does a period go

Answer 38

Rows (vertically)

Question 39

Describe the atomic structure

Answer 39

Atomic number (what u draw) Chemical symbol Element name Atomic mass (Atomic mass-atomic number = #of neutrons )

Question 40

What are the different types of groups in the periodic table

Answer 40

Group 1: alkali metals Group 2: alkaline earth metals Group 17:halogens Group 18: noble gas

Question 41

What are the three kinds of elements on a periodic table

Answer 41

Non-metals Metals Metalloids

Question 42

What is a mixture

Answer 42

Can be separate with physical changes

Question 43

What are two pure substances. Describe

Answer 43

Elements: cannot be broken down by physical or chemical changes Compounds: can be broken down into one or more elements by physical changes Eg: h20 is a compound