Formula's to remember

Question 1

The formula for density?

Answer 1

Density = Mass / Volume

Question 2

Converting from C to F

Answer 2

add 40 to the given number in C
multiply that by 9/5
then subtract 40

Question 3

Converting from F to C

Answer 3

add 40 to the given number in F
multiply that by 5/9
then subtract 40

Question 4

Converting from C to K

Answer 4

add 273

Question 5

the formula for energy

Answer 5

q = specific heat x change in temp x mass

Question 6

Specific heat formula

Answer 6

Cs = Jules/mass x temp

Question 7

Calculating amounts from balanced chemical equations

Answer 7

Actual mass of substance / adjusted molar mass (AMM)= moles of substance.

Multiply moles of given substance by AMM to get grams of substance in reaction

Question 8

Boyle’s Gas Law

Answer 8

P₁V₁ = P₂V₂ (moles and temp constant)

Question 9

Charles Gas Law

Answer 9

V₁/T₁ = V₂/T₂ (moles and pressure constant)

Question 10

Combines Gas Law

Answer 10

P₁V₁/T₁ = P₂V₂/T₂ (moles constant)

Question 11

ideal gas law

Answer 11

PV = nRT

R(constant)

Question 12

Ideal gas constant (R)

Answer 12

R = 0.0821 (L)(atm)/(mole)(K)

Question 13

Dalton’s Gas Law

Answer 13

P Total = P₁+P₂+P₃…

Question 14

Boyle’s Gas Law

Answer 14

P₁V₁ = P₂V₂ (moles and temp constant)

Question 15

Charles Gas Law

Answer 15

V₁/T₁ = V₂/T₂ (moles and pressure constant)

Question 16

Combines Gas Law

Answer 16

P₁V₁/T₁ = P₂V₂/T₂ (moles constant)

Question 17

ideal gas law

Answer 17

PV = nRT

R(constant)

Question 18

Ideal gas constant (R)

Answer 18

R = 0.0821 (L)(atm)/(mole)(K)

Question 19

Dalton’s Gas Law

Answer 19

P Total = P₁+P₂+P₃…

Question 20

%(m/m) concentration

Answer 20

Mass if solute, g
Divided by
Mass if solution, g
Times 100

Remember!!!! you have to divide by the SOLUTION not the SOLVENT. You have to add the solute to the solvent to get the solution mass before dividing.

Question 21

%(v/v) concentration

Answer 21

Volume of solute, mL
Divided by
Volume of solution, mL
Times 100

Solute and solution have to be in same units ( L & L, mL & mL, etc)

Question 22

%(m/v) concentration

Answer 22

Mass of solute, g
Divided by
Volume if solution, mL
Times 100

Solution must be in mLs

Question 23

Molarity

Answer 23

Moles of solute, mol
Divided by
Liters of solution, L

Question 24

Dilution

Answer 24

(Cs) (Vs) = (Cd)(Vd)

Question 25

Dilution

Answer 25

(Cs) (Vs) = (Cd)(Vd)

Question 26

[H₃O⁺] + [OH⁻] =

Answer 26

1.00 x 10⁻¹⁴

Question 27

3 - 3 - 2 - 2 - 1

Answer 27

Fixed charges (and oxidation numbers) the for following....
Al, Ga, Zn, Cd, Ag

Question 28

name the fixed charges for the following….in order….Al, Ga, Zn, Cd, Ag

Answer 28

3, 3, 2, 2, 1

Question 29

fixed charge for Zn and Cd

Answer 29

2

Question 30

fixed charge for Ag

Answer 30

1

Question 31

fixed charge for Al and Ga

Answer 31

3