Chemisty test

Question 1

true or false. electrons travel in set orbits similar to the planets around the sun.

Answer 1

false

Question 2

the density of substance is a ____ property of the substance.

Answer 2

physical

Question 3

isotopes of carbon have different _____

Answer 3

mass numbers

Question 4

4.00500 has how many significant figures?

Answer 4

6

Question 5

type of radiation that works your TV remote

Answer 5

infrared radiation

Question 6

silicon has an atomic mass of 28. it has an equal number of protons and neutrons. thus, it has ___ protons, ___ neutrons, and ___ electrons.

Answer 6

14,14,14

Question 7

water changes state at ____

Answer 7

0 degrees C and 100 degrees C. also 32 degrees F and 212 degrees F

Question 8

the state of matter which is composes of ions and electrons (most common state of matter in the universe)

Answer 8

plasma

Question 9

true or false.the density of a substance can be changed by reducing the samples size.

Answer 9

false

Question 10

the space matter fills is defined as ____

Answer 10

volume

Question 11

this force holds the protons in the nucleus together.

Answer 11

strong force

Question 12

____ determines the position on the periodic table

Answer 12

atomic number

Question 13

like changes ____ on another

Answer 13

repel

Question 14

which of these elements are important to industry?

a) Fe
b) AL
c) Ag
d) Hg
e) all listed

Answer 14

all listed

Question 15

true or false. light is considered to be matter

Answer 15

false

Question 16

which has the highest density?

a) water
b) cork
c) galena
d) quartz
e) pyrite

Answer 16

galena

Question 17

Al is the chemical symbol for which element?

Answer 17

aluminum

Question 18

ionic bonds occur in the ____ state of matter

Answer 18

solid

Question 19

how fast are you traveling in kilometer per hour if you are traveling 55 miles per hour (1km = .62 mile or 1 mile = 1.61km)

Answer 19

89km per hour

Question 20

____ is what holds atoms together when they form compounds

Answer 20

bonds

Question 21

a ___ is a substance containing two or more chemically combined elements.

Answer 21

compounds

Question 22

the compound Fe(SO) is composed of the following elements:

Answer 22

iron, sulfer, and oxygen

Question 23

which of the following elements are man made?

a) copper
b) einsteinium
c) tin
d) lead

Answer 23

einsteinium

Question 24

a ____ change converts one substance into one or more new substances

Answer 24

chemical

Question 25

which of the following elements are poisonous?

a) Hg
b) U
c) As
d) Pb
e) all listed

Answer 25

all listed

Question 26

if an object has a density of 2.5g/ml will it float in water?

Answer 26

no

Question 27

what is the density of water?

Answer 27

1.0 g/ml

Question 28

true or false. protons always equal neutrons in an atom

Answer 28

false

Question 29

_____ are the particles without electric charge in the atoms nucleus.

Answer 29

Neutrons