Basics

Question 0

What is matter?

Answer 0

Something with mass and volume

Question 1

What is Chemistry?

Answer 1

Study of composition, structure, and properties of matter and the changes it undergoes.

Question 2

What is the law of conservation of mass?

Answer 2

Mass reactants = mass products

Question 3

Metric?

Answer 3

khdudcm

Question 4

What is a physical change?

Answer 4

Change a property without changing identity of substance

Question 5

What is a chemical change?

Answer 5

Changes that change the identity of a substance

Question 6

What’s an extensive physical change?

Answer 6

Depends on amount of matter. (Length, width, weight, etc)

Question 7

What’s an intensive physical property?

Answer 7

Does not depend on amount of matter.

Question 8

What are the four indications of a chemical change?

Answer 8

1) change in color
2) change in energy (hotter, colder, giving off light
3) evolving of a gas (bubbles)
4) formation of a precipitate

Question 9

What’s an exothermic rxn?

Answer 9

Heat is leaving system (feels hot)

Question 10

What is an endothermic rxn?

Answer 10

Heat is entering a system (feels cold)

Question 11

What’s a theory?

Answer 11

Explanation of why (backed by experiments)

Question 12

What’s a law?

Answer 12

Statement about what’s observed. (Backed by experiments)

Question 13

What’s the formula for % error?

Answer 13

Vtrue - Vexp
————— * 100
Vtrue

Question 14

What is a mixture?

Answer 14

A combination of things not chemically combined. (Can be separated physically)

Question 15

What are some ways to separate mixtures?

Answer 15

Magnetism
Distillation (boiling point)
Filtration (particle size)
Chromatography (affinity)

Question 16

What’s a heterogeneous mixture?

Answer 16

Can see individual particles

Question 17

What is a homogeneous mixture?

Answer 17

Can’t see individual particles

Question 18

What a direct relation? (Math)

Answer 18

One divided by the other gives a constant.
(y = kx)
graphs a straight line

Question 19

What is an inverse relation? (Math)

Answer 19

One multiplied by the other gives constant
y = k/x
Curved line

Question 20

What is the law of definite composition?

Answer 20

A chemical compound contains the same elements in exactly the same properties by mass regardless of sample size

Question 21

What is the law of multiple proportions?

Answer 21

Ratio of masses of elements in a compound is always a ratio of small whole numbers

Question 22

Who first came up with the idea of an atom?

Answer 22

Democritus

Question 23

What are Dalton’s 5 points

Answer 23

-All matter is composed of atoms
£All atoms of a given element are identical (size,mass,chem properties). Atoms of a specific element are diff from other elements.
£Atoms can’t be created divided or destroyed
-diff atoms combine in diff whole # ratios to form compounds
-in a chem rxn atoms are separated combined or rearranged

Question 24

Who performed the Cathode Ray Experiment?

Answer 24

J J Thompson

Question 25

What are 3 things learned from the cathode ray experiment?

Answer 25

• all substances contain e-
• electrons have mass
• electrons have a negative charge

Question 26

Who preformed the golden foil experiment?

Answer 26

Rutherford

Question 27

What are three things learned from the gold foil experiment?

Answer 27

• Nucleus is small (out of total atom)
• nucleus has a positive charge
• nucleus has high mass

Question 28

Who preformed the oil drop experiment?

Answer 28

Millikan

Question 29

What did the oil drop experiment teach us?

Answer 29

Electron mass

Other things in atom

Question 30

What is the approximate mass of an electron?

Answer 30

1/2000 the size of an H atom

Question 31

What is an isotope?

Answer 31

Atom with differing mass due to differing numbers of neutrons

Question 32

What is a mass number?

Answer 32

The sum of the neutrons and protons

Question 33

What is an ion?

Answer 33

A charged species

Question 34

What are the two kinds of ion?

Answer 34

Cation +

Anion -