describing the matter

Question 1

define a compound

Answer 1

it is a substance made of 2 or more elements that are chemically combined in a set ratio

Question 2

what is distillation

Answer 2

the process of putting liquid to boil to separate them

Question 3

what is a molecule

Answer 3

2 or more atoms held together

Question 4

true or false:
element is the basic unit of matter

Answer 4

false

Question 5

true or false:
the atoms of a mixture are chemically bonded

Answer 5

false

Question 6

ture or false:
water molecule is composed of four hydrogen atoms and one oxygen atom

Answer 6

false

Question 7

methane is composed of four hydrogen atoms and one carbon atom

Answer 7

true

Question 8

we use ______ to describe matter

Answer 8

properties

Question 9

burning and backing are examples of ________

Answer 9

physical and chemical change

Question 10

the property which can be observed without converting a substance to another form is called_____

Answer 10

physical change

Question 11

_____ is the smallest measure of matter

Answer 11

atom

Question 12

methane is made up of

Answer 12

one carbon and four hydrogen atoms

Question 13

what is the difference between and compound and a mixture

Answer 13

compound are substances formed by chemical combinations, mixture are substances formed by physically mixing it

Question 14

write the names of any two structures which can be made from carbon

Answer 14

CH4 methane
CO2 carbon dioxide

Question 15

when two different groups of atom form by a chemical bond, they form a _______

Answer 15

substance