Chemistry Intro

Question 1

Define Chemistry

Answer 1

The science that deals with the materials of the universe and the changed that these materials undergo

Question 2

Define states of matter

Answer 2

anything with mass that occupies space

Question 3

State the 3 states of matter

Answer 3

Solid/ liquid/ gas

Question 4

Describe an atom

Answer 4

smallest particle of a chemical element made of 3 parts
Proton and Neutron- Nucleus
Electron- flys around the nucleus

Question 5

Define mass number

Answer 5

Approximately equivalent to the number of protons and neutrons in the atom

Question 6

Define molecule

Answer 6

when two atoms join together

Question 7

Compound

Answer 7

a molecule with at least 2 different atoms that are chemically bonded

Question 8

Compound examples

Answer 8

Sucrose- table sugar/ Gluten/

Question 9

What are the common chemicals found in the body

Answer 9

Nitrogen, Phosperous, Calicum, Carbon, Oxygen, Hyrdrogen

Question 10

Physical change

Answer 10

states of matter and energy
no new substance is created during a physical change matter takes a different form
reversible eg melting ice,
can be irreversible- cutting hair
- no change in atoms rearrangement just change i neighbor interaction

Question 11

Equation that represents a bicarbonate buffer

Answer 11

CO2 + H2O– H2Co3—H + HCO3

Question 12

Chemical changes in chemistry

Answer 12

irreversible, rearrangement of atoms, change in chemical prosperities, formation of new substance

Question 13

Describe the structure of a atom

Answer 13

Proton and Neutron within the nucleus

Electron on the outside

Question 14

Atomic mass/ Mass number

Answer 14

The number of protons and neutons in an atom

Question 15

Isotope definition

Answer 15

equal number of protons but different number of neutrons in the nuclei