Properties of Matter and Substances

Question 1

Pure substance

Answer 1

matter that always has the same composition - sugar, salt

Question 2

element

Answer 2

matter that can’t be broken down into simpler substances – copper, gold, carbon ONLY 1 TYPE OF ATOM

Question 3

atom

Answer 3

smallest particle of an element

Question 4

Jons Berzelius

Answer 4

Swedish man who came up with symbols for elements

Question 5

molecule

Answer 5

group of atoms joined together by covalent bonds

Question 6

compound

Answer 6

matter that is made up of two or more simple substances - they can be broken down - WATER IS A COMPOUND - oxygen and hydrogen

Question 7

Mixtures

Answer 7

they keep some of properties of their ingredients - salsa

Question 8

heterogeneous mixtures

Answer 8

parts of a mixture are different from one another - SAND IS AN EXAMPLE

Question 9

homogeneous mixture

Answer 9

can’t see the different substances in the mixture - WATER IN SWIMMING POOL

Question 10

colloid

Answer 10

milk is a colloid - can’t separate with filter fog is a colloid

Question 11

solution - homogeneous

Answer 11

when substances dissolve - THEY DO NOT SEPARATE INTO LAYERS - windshiel wiper fluid

Question 12

suspensions - heterogenous

Answer 12

mixture that separates into layers over time - YOU CAN USE A FILTER - WATER AND SAND

Question 13

physical property

Answer 13

characteristic of a material that can be measured without changing the substances in the material

Question 14

Examples of physical properties

Answer 14

viscosity, melting point, density, malleability, conductivity, hardness

Question 15

Why study physical properties

Answer 15

They help people identify material, pick which material to use for a job, or to help separate mixture for a purpose

Question 16

Filtration and distillation

Answer 16

Two ways to separate mixtures!!!!

Question 17

Physical change

Answer 17

properties of a material change but substances in material are the same SUBSTANCE IS THE SAME

Question 18

Examples of physical change

Answer 18

freeze water, melt ice, freeze water again
melt butter in pan but still butter
cut hair
slice tomatoes

Question 19

Chemical property

Answer 19

ability to produce a change in the composition of matter

Question 20

Two chemical properties

Answer 20

flammability, reactivity

Question 21

Chemical change

Answer 21

this happens when a substance reacts or forms into one or more substances - THERE IS A CHANGE

Question 22

evidence of chemical change

Answer 22

color change - banana, copper roof
produce gas- vinegar and baking soda
precipitate - curdling milk