Molecules, Compounds and more definitions

Question 1

atom

Answer 1

an atom is the smallest part of an element that can exist

Question 2

an element

Answer 2

is a pure substance made up of the same kind of atoms

Question 3

a compound

Answer 3

a purse substance made up of two or more elements chemically bonded

Question 4

a molecule

Answer 4

a pure substance made up of two or more atoms

Question 5

can a molecule be a compound?

Answer 5

All compounds are molecules, but not all molecules are compounds

Question 6

valence electron

Answer 6

is an electron found in the outer most energy level of an atom

Question 7

valency

Answer 7

number of bonds that an atom makes

Question 8

orbital

Answer 8

a region in which electrons are most likely to be found

Question 9

aufbua diagrams explain order

Answer 9

1s
2s
2p
3s
3p
4s

Question 10

field lines go from

Answer 10

north to south

Question 11

combustion reaction

Answer 11

when a substance rests with oxygen to produce carbon and water

Question 12

corrosion

Answer 12

the chemical attack on the surface of a metal causing it to erode or break

Question 13

malleable

Answer 13

has the ability to be hammered or pressed into a flat sheet without breaking

Question 14

ductile

Answer 14

has the ability to be rolled into a wire

Question 15

Density

Answer 15

Mass/volume = g.cm-3

Question 16

melting point

Answer 16

temperature at which a solid given sufficient heat becomes a liquid

Question 17

brittle

Answer 17

hard but likely to break easily

Question 18

metalloid

Answer 18

a substance that shows increasing conductivity with increasing temperature

Question 19

electrical conductor

Answer 19

a material that allows the flow of charge

Question 20

electric insulator

Answer 20

a material that prevents the flow of charge

Question 21

a thermal conductor

Answer 21

a material that allows wat to pass through easily

Question 22

thermals insulator

Answer 22

a material that does not allow heat to pass through it

Question 23

matter

Answer 23

is anything that occupies space and has mass

Question 24

materials

Answer 24

substances composed of matter

Question 25

mixture

Answer 25

is a combination of two or more pure substances that are not bonded together

Question 26

homogenous mixture

Answer 26

is a mixture that has a uniform composition and the various components of the mixture cannot be seen

Question 27

heterogeneous mixture

Answer 27

is a mixture that does not have a uniform composition and the various components can be seen

Question 28

ferromagnetic substances

Answer 28

materials that are strongly attracted by magnets