Chapter 1 Notes

Question 1

what is matter?

Answer 1

anything that has mass and takes up space.

Question 2

what is Density?

Answer 2

mass over volume

Question 3

physical property

Answer 3

observed and measured WITHOUT changing into another substance

Question 4

examples of physical property

Answer 4

density, melting and boiling points.

Question 5

Physical change

Answer 5

recognizable difference in the appearance

Question 6

example of physical change

Answer 6

ice - water -steam

Question 7

chemical property

Answer 7

observed through a chance in composition

Question 8

examples of chemical property

Answer 8

toxicity, flammability, reactivity w/ oxygen, enthalpy of formation.

Question 9

intensive property

Answer 9

independent of quantity (the amount of substance we are measuring)

Question 10

extensive property

Answer 10

dependent of quantity (measuring the mass and volume & the value will depend how much substance you have)

Question 11

what is an element

Answer 11

cannot be reduced or simplified and still exit the same properties and characteristics

Question 12

what is a compound?

Answer 12

two or more elements defined as a ratio

Question 13

what are compounds held by?

Answer 13

chemical bonds

Question 14

what are the types of chemical bonds?

Answer 14

ionic and covalent bonds

Question 15

neutral atom or molecule

Answer 15

can be present as neutral or ions

Question 16

what kind of charge does neutral molecules have

Answer 16

no charge

Question 17

what kind of charge ions does have?

Answer 17

negative or postive charge

Question 18

how do ions become positive or negative charge?

Answer 18

the loss or gain of electrons

Question 19

What is chemical reaction?

Answer 19

conversion of one or more substance into one or more different substance
Also occurs at the level of the valence electrons

Question 20

what is a pure substance

Answer 20

element or compound

Question 21

mixture

Answer 21

homogenous and heterogeneous

Question 22

Homogenous mixture

Answer 22

same no matter where in mixture (completely mixed)

Question 23

heterogeneous mixture

Answer 23

difference in substance (Not completely mixed

Question 24

What is a solid?

Answer 24

particles very close defintie volume and shape

Question 25

liquid

Answer 25

particles somewhat close definite volume , but not shape

Question 26

gas

Answer 26

particles widely separated - no definite shape

Question 27

accuracy

Answer 27

degree of agreement between measurements and true value

Question 28

precision

Answer 28

measure of agreement between replicate measurements