Chem Review Quiz

Question 1

Density equation?

Answer 1

D= m/v

Question 2

Given density and volume, what is the equation for mass

Answer 2

M= D(V)

Question 3

Given mass and density, what is the equation for volume?

Answer 3

V= m/d

Question 4

If an element is an ion, that means it is:

Answer 4

Charged

Question 5

If I know the number of electrons in an ion, what formula do I use to find its charge?

Answer 5

Protons - electrons

Question 6

Define isotope

Answer 6

Atoms of the same element with different numbers of neutrons

Question 7

Sublevels in the 1st, 2nd, 3rd, 4th energy level

Answer 7

1st- s
2nd- s, p
3rd- s, p, d
4th- s, p, d, f

Question 8

How many orbitals and electrons are in the s sublevel? P? D? F?

Answer 8

S- 1 orbital, 2 electrons
P- 3 orbitals; 6 electrons
D- 5 orbitals; 10 electrons
F- 7 orbitals; 14 electrons

Question 9

What are the max possible electrons in the 1st energy level? 2nd? 3rd? 4th?

Answer 9

1st- 2
2nd- 8
3rd- 18
4th- 32

Question 10

What are valence electrons?

Answer 10

Electrons in the highest energy level

Question 11

What rules do you need to keep in mind when using a periodic table to compare the size of 2 or more elements?

Answer 11

Size increases from right to left and from top to bottom.

Question 12

What is an ionic bond?

Answer 12

A bond between two oppositely charged ions

Question 13

In general, the stronger the bonds, the _______ the bonds.

Answer 13

Shorter

Question 14

In general, double bonds are _______ than triple bonds.

Answer 14

Longer

Question 15

Bonds with a low bond energy are ________ than bonds with high bond energy.

Answer 15

Weaker

Question 16

Combustion formula

Answer 16

CxHx + O2 —-> CO2 +H2O

Question 17

How do you find the percent composition?

Answer 17

1) find molar mass of overall ion
2) find molar mass of the element you’re trying to find
3) divide the molar mass of the element by the molar mass of the ion
4) multiply by 100

Question 18

How do you find the empirical formula of a compound?

Answer 18

1) take the percentage given and divide them by mass of the single element
2) divide the answers by the smallest answer
3) your answer from this is your subscript

Question 19

How do you find the molecular formula for a compound?

Answer 19

1) divide the number given by the molar mass of the compound
2) take this answer and multiply it by the subscripts

Question 20

What is the SI unit for length, mass and time?

Answer 20

Length: meters
Mass: kilogram
Time: second