Unit 2 Test

Question 1

Be able to recognize the 4 parts of Dalton’s theory of the atom.

Answer 1

1.) all elements are composed of tiny indivisible particles called atoms
2.) atoms of the same element are different from those of another
3.) atoms of different elements can physically mix together or chemically combine in simple whole number ratios to form compounds
4.) Chemical reactions occur when atoms are separated, combined, or rearranged in a different combination

Question 2

JJ Thomsan contribution and experiment

Answer 2

Plum putting model - found that it didn’t matter what gas or metal he used, electrons are common to all elements

Question 3

Ruthford contribution and experiment

Answer 3

• Concluded that atoms must be mostly empty space, with the positive protons being clustered close together (cluster of protons = nucleus)
• Alpha particles scattered when near the nucleus of the gold foil
• Atoms are empty space

Question 4

Know the parts of an atom (Name, mass, charge, location, etc).

Answer 4

• Protons - positive, mass of 1, inside the nucleus
• Neutrons - neutral, mass of 1, inside the nucleus
• Electrons - negative, mass of almost 0, outside of the nucleus

Question 5

Atomic number

Answer 5

protons

Question 6

Mass #

Answer 6

protons + neutrons

Question 7

Charge

Answer 7

Protons - neutrons

Question 8

neutrons

Answer 8

mass - protons

Question 9

Know what an isotope is.

Answer 9

An atom with the same number of protons but different number of neutrons
ex.) Carbon 12, carbon 13, carbon 14

Question 10

Know what a cation (+ion) and anion (-ion) are.

Answer 10

• Cation (+ion) - positively charged ions
• Anion (-ion) - negatively charged ions