midterm

Question 1

How do you write 0.00042 in scientific notation?

Answer 1

4.2x10^-4

Question 2

How are science and technology related?

Answer 2

yes bc if technology advances so does science

Question 3

What physical properties of nylon make them good shoe laces

Answer 3

flexible and durible

Question 4

WHo provided evidence for the existence of the nucleus in an atom?

Answer 4

Rutherford

Question 5

What characteristic of an element makes an element?

Answer 5

number of protons

Question 6

what is flammibility?

Answer 6

ability to burn in the presence of oxygen

Question 7

what does the electron cloud model describle about electrons

Answer 7

locations of electrons around nucleus

Question 8

what is an atomic mass unit

Answer 8

1/12 mass of a carbon 12 atom

Question 9

what happens to the number of valence electrons of an elementas you move left to right across a period in the periodic table

Answer 9

increases

Question 10

what gives an element the tendency to react

Answer 10

number of valence electrons

Question 11

how many valence electrons does Boron? helium?

Answer 11

Boron has 3, Helium has 2

Question 12

which element is founf in most compounds in your body

Answer 12

carbon

Question 13

what is an ionic bond

Answer 13

transfer of electrons

Question 14

potassium, K, reacts w bromine, Br, to form what compound

Answer 14

Potassium Bromide

Question 15

what is precision

Answer 15

exact

Question 16

what is the slope of a line

Answer 16

vertical to horizantal change

Question 17

where is chemical energy contained in a compound

Answer 17

in the bonds

Question 18

what do reaction rates not tell you about a reaction

Answer 18

substances changing states

Question 19

is celery considered acidic or basic

Answer 19

basic

Question 20

on the ph scale what is 6 considered as

Answer 20

basic

Question 21

strong electrolytes would be considered as what type of acids/basics

Answer 21

strong

Question 22

what is a homo mix

Answer 22

remains evenly mixed, same

Question 23

descrobe the shape and volume of liquid, solid, gas

Answer 23

def shape vol, gas indef

Question 24

what is the grp name of the elements highest in reactivity

Answer 24

alkali metals (1A)

Question 25

what subatomic particle did JJ Thompson discover what is the charge

Answer 25

electrons w - charge

Question 26

what is absolute zero

Answer 26

nothing moves, 0K, -273C

Question 27

from left to right on the periodic table elements become less____ and more ____

Answer 27

metallic and non metallic

Question 28

what do the dots represent in an electron dot diagram

Answer 28

electrons

Question 29

what is viscosity? what is malleability?

Answer 29

malleale-can be hammered wo shattering, resistance to flow

Question 30

what is the temo water frezzes

Answer 30

0C, 32F, 273K

Question 31

why is the volume of a liquid constant

Answer 31

forces of attraction keeps particles close together

Question 32

what is suspension

Answer 32

hetero mix, settles to layers

Question 33

what did aristotle believe about matter

Answer 33

all matter was made from water, fire, wind, earth

Question 34

what is te name of the grp 7A elements

Answer 34

Halogens, 2nd most reactive

Question 35

what side are reactants found on in a chemical equation

Answer 35

left t right

Question 36

what 3 factors affect pressure of a gas in an closed container

Answer 36

temp, volume, number of particle

Question 37

why was it difficult to discover the noble gases

Answer 37

do not react, colorless, odorless

Question 38

what is the dif between an orbital and electron cloud

Answer 38

orbital- likely locations, visual

Question 39

what happens when oil mixes with water

Answer 39

it sits, no mixy