Chemistry quiz

Question 1

alpha

Answer 1

• loss of two protons
• loss of two neutrons
• reduces mass number of nucleus by four
• reduces atomic number by 2
  top number -4/+4
  bottom number -2/+2

+4/-2
e
+2/-2

Question 2

Beta

Answer 2

neutron decays
ejection of proton plus and electron

0
e
-1

Question 3

Gamma

Answer 3

has no mass
electromagnetic radiation high
not change mass number or atomic number

Question 4

positron emission

Answer 4

protons change into neutron plus an ejected positron

0
e
+1

Question 5

Electron capture

Answer 5

atomic number decreases by 1
convert proton into neutron
mass number is unchanged

Question 6

Ionic

Answer 6

metal + nonmetal

Question 7

naming acids

Answer 7

H ions removed from “ic” acid, anion’s name ends with “ate”

H ions removed from “ous” acid, anion’s name ends with “ite”

name first element: use full name but with prefix of how many atoms it has (mono, di, tetra) ex: monoxide

name second element: use root followed by “ide” ex: dioxide

N2O5 –> dinitrogen pentoxide
SO3 –> Sulfur Trioxide
N2O –> dinitrogen monoxide

Question 8

1,2,3, 4, 5, 6 for first word

Answer 8

mono, di, tri, tetra, penta, hexa

Question 9

transition metals

Answer 9

1) cross multiply charges
2) then name them

Question 10

polyatomic ion names:

Answer 10

SO₄²⁻ is sulfate
NO₃⁻ is nitrate
NH₄⁺ is ammonium
CO₃²⁻ is carbonate

Question 11

Dalton’s atomic theory

Answer 11

elements are small particles called atoms

Question 12

thompson atomic theory

Answer 12

opposite charges attract, same charges repel

cathode experiment

Question 13

Milikan experiment

Answer 13

Oil drop experiment

gave us magnitude of charge

oil droplets on brass plate

Question 14

rutherford experiment

Answer 14

existence of nucleus

zinc sulfide around gold foil, alpha particle

Question 15

top number
element name
bottom number

Answer 15

top number –> protons + neutrons (mass number)
element name
bottom number –> protons (atomic number)

Question 16

isotopes

Answer 16

atoms with same element with different numbers of neutrons

Question 17

atomic weight formula

Answer 17

(mass)(abundance/percentage) + (mass 2)( abundance/percentage 2)

Question 18

Avogadro’s number

Answer 18

1 mol of any element = 6.022141*10^23 atoms

Question 19

matter

Answer 19

anything that has mass and occupies volume

Question 20

Mixtures

Answer 20

blend of two or more substances added together without chemically changing the substance itself (saltwater, concrete)

Question 21

Pure substance

Answer 21

formed when atoms of different elements combine chemically (H2O, NaCl, Glucose, Au, O2)

Question 22

metals and nonmetals are located where on the periodic table

Answer 22

metals middle, nonmetals right

Question 23

% yield formula

Answer 23

theoretical - amount of product that would result if limiting reacted
actual - amount of product obtained from reaction

% yield = (actual yield / theoretical yield) * 100

Question 24

limiting reaction

Answer 24

present in limiting amount

Question 25

excess reactant

Answer 25

reactant still present after reaction. aka excess stuff