Pages 7-18 Chapters 3-4

Question 1

What digit is always the “uncertain” one?

Answer 1

The last one

Question 2

If a 0 is in the begging of a measurement does it count?

Answer 2

Never

Question 3

If a 0 is in the middle of a measurement does it count?

Answer 3

Always

Question 4

If a 0 is in the end of a measurement does it count?

Answer 4

If there is a decimal

Question 5

When adding and subtracting significant figures how do you get the most precise answer?

Answer 5

By judging the answer by the farthest point after a decimal

Question 6

When multiplying and dividing significant numbers how do you get the most precise answer?

Answer 6

By judging by the answer with the least significant numbers

Question 7

Is a Scientific Notation always less than equal too or greater than 1-9?

Answer 7

Equal too

Question 8

What is an atom?

Answer 8

The smallest particle of an element that retains its identity in a chemical reaction

Question 9

What were the limitations of Democritus’s ideas about atoms?

Answer 9

Indivisible and Indestructible

Question 10

Which of the following Statements are true?

a. Atoms are the smallest particle of matter
b. The mass of an iron atom is different from the mass of a copper atom
c. Every atom of silver is identical to every other atom of silver
d. A compound is composed of atoms of two or more different elements
e. a, b and c

Answer 10

e. a, b and c

Question 11

What is Dalton’s theory to how atoms react during a chemical reaction

Answer 11

Chemical reactions occur when atoms are separated from each other, joined or rearranged in a different combination. (Atoms of one element are never changed into atoms of another element as a result of chemical reaction)

Question 12

What experimental evidence did Thomson have to say electrons have a negative charge?

Answer 12

The negatively charged electrons made the cathode ray glow

Question 13

What experimental evidence did Thomson have to say atoms of all elements contain electrons

Answer 13

It keeps neutrality, its makes it so that every time we touch something we don’t get shocked

Question 14

Would you expect two electrons to attract or repel each other

Answer 14

Repel

Question 15

How do the charge and mass of a neutron compare to the charge and mass of a proton?

Answer 15

The are nearly the same

Question 16

Why does it make sense that if an atom loses its electrons it is left with only a positive charge?

Answer 16

Because electrons cause negative charge and they are gone so all that’s left is protons and neutrons which both have positive charges

Question 17

Where were the electrons in Thomson’s plum-pudding model of an atom?

Answer 17

In the center

Question 18

How did Rutherford’s gold-foil experiment differ from his expectations?

Answer 18

Rutherford did not expect the Alpha particles to deflect at such a large angel

Question 19

Is the charge positive or negative in the nucleus of all atoms?

Answer 19

Positive

Question 20

In Rutherford’s atomic model, which subatomic particles are located in the nucleus?

Answer 20

Protons and Neutrons

Question 21

Metric Conversions: Mole=

Answer 21

1

Question 22

Metric Conversions: Molecule (or atom, formula unit or particle)=

Answer 22

6.02x10(23)

Question 23

Metric Conversions: gram=

Answer 23

Mass

Question 24

Metric Conversions: Liter=

Answer 24

22.4