atoms structure test

Question 1

thins that aren’t matter

Answer 1

light, heat, sound

Question 2

pure substances

Answer 2

definite composition: each substance has exactly the same composition

Question 3

element

Answer 3

only one type of atom; iron gold oxygen ect

Question 4

compound

Answer 4

2 or more types atoms; salt sugar water

Question 5

elements substances

Answer 5

cannot be broken down and are made up of all the same atoms

Question 6

monatomic elements

Answer 6

composed of single atoms NOT bonded to each other

Question 7

diatomic elements

Answer 7

2 of the same elements bonded together

Question 8

diatomic elements name them.

Answer 8

Bromine Br2, Iodine I2, Nitrogen N2, Chlorine Cl2, Hydrogen H2, Oxygen O2, Fluorine F2 (BrINClHOF)

Elements that exist as diatomic molecules

Question 9

compounds made up of and can

Answer 9

2 or more different atoms chemically combined.
they have a fixed composition.
can be separated chemically back into simpler substances (elements)

Question 10

mixture

Answer 10

2 or more different substances that are physically combined.
have varying compositions

Question 11

what type of mixtures are there

Answer 11

2 types; homogeneous and heterogeneous

Question 12

homogeneous mixture

Answer 12

substances are uniformly mixed (you can’t see the separate parts) ex; air, sugar in water.

ALL SOLUTIONS ARE HOMOGENEOUS MIXTURES

Question 13

what does aq stand for

Answer 13

aqueous (dissolves in water)

Question 14

heterogeneous mixture

Answer 14

substance are not uniformly mixed (you can see the separate parts)
ex; oil & water, sand &a water, chocolate chip cookie

Question 15

separating a mixture

Answer 15

mixtures can be separated based on physical properties

Question 16

physical properties of separating mixtures

Answer 16

• boiling point/ freezing point
• magnetism (separates iron from mixture)
• solubility
• density
• particle size

Question 17

what r the methods of separation

Answer 17

filtration
distillation
evaporation
chromatography

Question 18

what is filtration

Answer 18

separates a solid form liquid

Question 19

what is distillation

Answer 19

separates mixtures of liquids based on boiling point

Question 20

evaporation

Answer 20

separates aqueous solutions {like saltwater}

Question 21

chromatography

Answer 21

separates particles based on solubility and attraction

Question 22

solids

Answer 22

definite volume and shape.

particles vibrate but don’t change positions

Question 23

liquids

Answer 23

definite volume
no definite shape {takes container shape}
constant motion

Question 24

gases

Answer 24

no definite volume or shape
greatest amount of movement
compressible

Question 25

determining phase of matter at STP

Answer 25

at different temps, a substance can be in a different phase of matter (s,l, g) scientists have determined "normal" conditions of temp and pressure called STANDARD TEMPERATURE AND PRESSURE (STP)

Question 26

what is matter?

Answer 26

matter is anything that has mass & takes up space (volume)