6th Grade Science Test 10

Question 1

anything that takes up space and has mass

Answer 1

matter

Question 2

the measure of the pull of gravity on an object

Answer 2

weight

Question 3

the amount of matter that makes up an object

Answer 3

mass

Question 4

the amount of matter in one unit of volume

Answer 4

density

Question 5

the tiny particles of which all matter is composed

Answer 5

atoms

Question 6

the tiny,e extremely dense core at the center of an atom

Answer 6

nucleus

Question 7

the tiny particles that swarm at tremendous speeds around the core of an atom

Answer 7

electrons

Question 8

the metric unit that is used to measure an object’s mass

Answer 8

grams or kilograms

Question 9

the two particles that make up the nucleus of an atom

Answer 9

protons, neutrons

Question 10

most metals are

Answer 10

solid

Question 11

the densest of the everyday metals

Answer 11

lead

Question 12

the semimetal that is used to make computer chips

Answer 12

silicon

Question 13

the only metal that is liquid at room temperature

Answer 13

mercury

Question 14

the element that is the basic building block of all the compounds

Answer 14

carbon

Question 15

a very hard metal which is an important ingredient in stainless steel

Answer 15

nickel

Question 16

the halogen that is added to toothpaste and drinking water

Answer 16

flourine

Question 17

the halogen that is useful as a bleach and a germ-killing agent

Answer 17

chlorine

Question 18

the halogen that is added to table salt to prevent a deficiency disease

Answer 18

iodine

Question 19

the colorless, odorless gas that makes up 78% of th earth’s atmosphere

Answer 19

nitrogen

Question 20

highly reactive elements that tend to form compounds with alkali and alkaline earth metals

Answer 20

halogens

Question 21

the simplest kind of atoms with one proton and one electron

Answer 21

hydrogen

Question 22

formed by electrons that are in orbit the same distance from the nucleus

Answer 22

shell

Question 23

the number of protons an atom has

Answer 23

atomic number

Question 24

formed by electrons zooming around the nucleus of an atom

Answer 24

electron cloud

Question 25

lacking an electrical charge

Answer 25

neutral

Question 26

the most abundant element at the surface of the earth

Answer 26

oxygen

Question 27

the study of what substances are made of and how one substance can be changed into another

Answer 27

chemistry

Question 28

the organized arrangement of all known elements

Answer 28

periodic table of the elements

Question 29

the elements which do not combine with anything else except under unusual circumstances

Answer 29

noble gases

Question 30

two or more atoms firmly bound together form a

Answer 30

molecule

Question 31

iodine, when heated, does not melt but instead ___, or turns to gas

Answer 31

sublimes

Question 32

the charge of a proton

Answer 32

positive

Question 33

a neutral atom has an ___ number of protons and neutrons

Answer 33

equal

Question 34

two electrons ___ each other

Answer 34

repel

Question 35

a substance that is composed of only one type of atom

Answer 35

element

Question 36

a substance composed of one or more types of atoms bonded together

Answer 36

compound

Question 37

if two objects have the same volume but different densities, the object made of the denser substance weighs

Answer 37

more

Question 38

the ___ of an object changes from place to place

Answer 38

weight

Question 39

the three main groups of elements

Answer 39

metals
nonmetals
semimetals

Question 40

a compound made of molecules

Answer 40

molecular compound

Question 41

the rapid reaction of any substance with oxygen

Answer 41

combustion

Question 42

a compound made of charged atoms

Answer 42

ionic compound

Question 43

the hardest of all known substances

Answer 43

diamond

Question 44

a process in which atoms of elements or compounds are rearranged to form new substances

Answer 44

chemical reaction