Chem Week One

Question 1

What is chemistry?

Answer 1

The study of matter and energy.

Question 2

What is matter?

Answer 2

Anything that uses space and has mass.

Question 3

What do the properties of chemical depend on?

Answer 3

The kind, number, and relationship.

Question 4

What are compounds made of?

Answer 4

Atoms of different elements.

Question 5

What is a theory?

Answer 5

A hypothesis that is tested over and over again over time that results in the same answer. It tells why something happens.

Question 6

What is a law?

Answer 6

Many theories that are composed into a mathematical equation. It describes what happens, but doesn’t tell why.

Question 7

Mega-

Answer 7

M => Base * 10^6

Question 8

Kilo-

Answer 8

K => Base * 10^3

Question 9

Centi-

Answer 9

C => Base * 10^-2

Question 10

Milli-

Answer 10

m => Base * 10^-3

Question 11

Micro-

Answer 11

µ or mc => Base * 10^-6

Question 12

Nano-

Answer 12

n => Base * 10^-9

Question 13

Pico-

Answer 13

p => Base * 10^-12

Question 14

What are the four phases of matter?

Answer 14

Liquid, solid, gas, and supercritical fluid.

Question 15

Why do atoms prefer to bind to other atoms?

Answer 15

Because atoms are unstable, and binding to other atoms create stable molecules.

Question 16

What is a molecule?

Answer 16

A binding of two or more atoms of the same kind.

Question 17

What is a compound?

Answer 17

A binding of two or more atoms that are made from different elements.

Question 18

What are the two types of matter?

Answer 18

Pure substance and mixture.

Question 19

What are the two branches of pure substance?

Answer 19

1. Element (made from one type of element)

2. Compound (made from one type of compound.)

Question 20

What are the two branches of mixture?

Answer 20

1. Homogeneous (matter has two or more types of compounds, but matter type is the same.)
2. Heterogeneous (two types of matter, two plus types of compounds, and isn’t uniform.)

Question 21

What are the changes in matter?

Answer 21

1. Physical (change changes the state or appearance, but not the composition.)
2. Chemical (does alter the composition of the matter.)

Question 22

Tera-

Answer 22

T => Base * 10^12

Question 23

Giga-

Answer 23

G => Base * 10^9

Question 24

Deci-

Answer 24

d => Base * 10^-1

Question 25

Femto-

Answer 25

f => Base * 10^-15

Question 26

What is the tendency of the universe?

Answer 26

To gravitate towards the lowest energy possible.

Question 27

Change in energy formula.

Answer 27

△E=Efinal−Einitial

△E = Ef-Ei

Question 28

Ideal gas law

Answer 28

PV=nRT

Question 29

Why do particles of the same charge repulse each other?

Answer 29

Because that is where the lowest amount of energy is.

Question 30

Why do particles of opposite charges attract each other?

Answer 30

Because it takes less energy to bind to one another.

Question 31

Coulomb’s Law

Answer 31

F=(kq1q2)/(εr^2)

Force = (constant * charge1 * charge 2)/(dielectric constant [shielding factor] * distance between charges)

Question 32

Form of Coulomb’s Law for energy

Answer 32

E∝(q1q2)/(ϵr) where ∝ is proportional to E and (q1q2)/(ϵr).

Question 33

What does energy depend on?

Answer 33

Distance.

Question 34

Four branches of stoichiometry

Answer 34

1. Atoms in a molecule (chemical formula)
2. The mass of a molecule.
3. Balance chemical equations.
4. Convert mass to moles to moles and mass.

Question 35

What make a mole?

Answer 35

6.022 * 10^23 of anything!