Midterm

Question 1

Element

Answer 1

Basic form of matter

Question 2

Compound

Answer 2

2+ elements combined

Question 3

Homogeneous Mixture

Answer 3

same thru out

Question 4

Heterogeneous Mixture

Answer 4

different thru out

Question 5

Broken down physical change, chemical, or neither

Answer 5

Element - neither

Compound - chemically

Mixture - physically

Question 6

What are intensive physical properties

Answer 6

observed w/out permanently changing substance

density, color, and boiling point

Question 7

Chemical property

Answer 7

Flammability or reacting w/acid or Cl

Question 8

Four signs of chemical change

Answer 8

1) unexpected color change
2) change in heat or light
3) producing new gas
4) formation of precipitate

Question 9

Solid

Answer 9

Definite volume and shape
Movement of paricles: Vibration

Question 10

Liquid

Answer 10

Definite volume, not definite shape
Movement: Flowing

Question 11

Gases

Answer 11

Not definite shape or volume
Movement: random

Question 12

Scientific notation

Answer 12

move the decimal so that the number is one whole and one after the decimal

Question 13

Sig Fig rules

Answer 13

1) non-zero numbers = significant
2) zero at the end, after decimal = sig
3) zero’s between numbers = sig
4) zero at end w/out decimal = not sig
5) zero at beginning before/after decimal = not sig

Question 14

Calculation sig fig rules

Answer 14

multi/div: least number of sig figs

add/sub: least number of decimals

Question 15

Calculation triangle

Answer 15

m/d*v

Question 16

Volume of rectangular cub

Answer 16

V = to length * width * height

Question 17

Water displacement

Answer 17

1) put water in gradulated cylinder & record volume
2) add irregular solid to cylinder & record new volume
3) subtract finial volume & initial volume

Question 18

Average

Answer 18

add all numbers then divide by number of trials

Question 19

Precise Data

Answer 19

similar values for each trial

Question 20

Accurate data

Answer 20

close to accepted value

Question 21

Define Atom

Answer 21

smallest part of an element w/ the properties of that element

Question 22

Molecule

Answer 22

2+ atoms chemically combined

Question 23

Protons, Electrons, & neutrons

Answer 23

Protons: pos charge, 1 amu mass, located inside the atom

Electrons: neg charge, 0 amu mass, located outside the atom

Neutrons: no charge, 1 amu mass, located inside the atom

Question 24

Equations

Answer 24

M= p + n
A = p = e
n = M - A
Mass over Atomic number when reading an element

Question 25

Isotopes

Answer 25

Atoms of the same element w/ same # of protons but different number of neutrons

Ex. C-12. C-13, and C-14

Question 26

Why aren’t mass numbers whole numbers?

Answer 26

it is the weighted average of all isotopes in an element

Question 27

Fusion

Answer 27

radioactive nucleus is hit w/a neutron (split into two or more smaller atoms)

can lead to chain reactions

Question 28

Fission

Answer 28

smaller atoms combine = new atom w/ bigger mass

require high temp + heat

Question 29

Alpha partical

Answer 29

4^2He

Question 30

Beta partical

Answer 30

0^-1e

Question 31

Wave

Answer 31

point w/ complete wave

Question 32

frequency

Answer 32

more waves

Question 33

Energy

Answer 33

= frequency