Chapter 1

Question 1

what is matter composed of

Answer 1

particles

Question 2

what determines the properties of matter

Answer 2

the structure of particles

Question 3

molecule representation
black sphere:
red sphere:
white sphere:

Answer 3

black: carbon
red: oxygen
white: hydrogen

Question 4

what is an atom

Answer 4

basic particles that compose ordinary matter

Question 5

what is chemistry

Answer 5

understand properties of matter by studying structure of molecules

Question 6

why is gas compressible

Answer 6

because of space

Question 7

pure substance

Answer 7

any type of particle and invariant composition can be indiival atoms or groups (water or table salt) can be element or compound

Question 8

true/false
an element can be broken down

Answer 8

false

Question 9

what is a compound

Answer 9

two or more elements

Question 10

law of conservation of mass

Answer 10

in chemical reaction, matter is neither created nor destroyed

Question 11

atomic theory

Answer 11

1)element is composed of atoms
2)all atoms of given element have same mass and properties that distinguish them from atoms of other elements
3)atoms combine in simple whole ratios to form compounds
4)atoms of one element cannot change into atoms of another element