Science Equations

Question 1

name an equation that links power voltage and current

Answer 1

P = V x I

Question 2

name an equation that links voltage current and resistance

Answer 2

V = I x R

Question 3

name an equation that links charge current time

Answer 3

Q = I x t

Question 4

name an equation that links energy voltage charge

Answer 4

E = V x Q

Question 5

name an equation that links energy voltage current time

Answer 5

E = V x I x t

Question 6

name an equation that links efficiency, useful energy out, total energy in

Answer 6

Efficiency (%) = (useful energy out ÷ total energy in) x 100.

Question 6

name an equation that links total cost number units cost unit

Answer 6

total cost = number / units x cost per unit

Question 7

name an equation that links GPE mass gravity height

Answer 7

GPE = m x g x h

Question 8

name an equation that links Kinetic Energy mass velocity

Answer 8

KE = ½m x v2

Question 9

name an equation that links work done force distance

Answer 9

W = F x d

Question 10

name an equation that links work done energy transferred

Answer 10

W = E

Question 11

name an equation that links power energy time

Answer 11

P = E ÷ t

Question 12

name an equation that links energy specific heat capacity mass change in temperature

Answer 12

E = c x m x θ

Question 13

name an equation that links speed distance time

Answer 13

s = d ÷ t

Question 14

name an equation that links acceleration change in velocity time

Answer 14

a = (v-u) ÷ t

Question 15

name an equation that links force mass and acceleration

Answer 15

F = m x a

Question 16

name an equation that links weight mass gravity

Answer 16

w = m x g

Question 17

name an equation that links momentum mass velocity

Answer 17

p = m x v

Question 18

name an equation that links change in density mass volume

Answer 18

d = m/v

Question 19

name an equation that links change in momentum Force time

Answer 19

(mv - mu) = F x t.

Question 20

name an equation that links pressure force area

Answer 20

p = F ÷ a

Question 21

name an equation that links moment force perpendicular distance from pivot

Answer 21

m = F x d

Question 22

name an equation that links velocity frequency wavelength

Answer 22

v = f x λ

Question 23

What is the equation for relative atomic mass (Ar)

Answer 23

(% isotope 1 x mass isotope 1) + (% isotope 2 x mass isotope 2) ÷ 100

Question 24

What is Avogadro’s number

Answer 24

6.02 x 10 to the power of 23

Question 25

what is one mole equal to

Answer 25

6.02 x 10 to the power of 23

Question 26

Mole ratio calculation how are they done

Answer 26

Step 1: Convert the data given in the question into amount, in moles
Step 2: Use the mole ratio of substances in the balanced chemical equation to
calculate the amount, in moles, of the substance required
Step 3: Convert the amount, in moles, back into the data required i.e. mass (g) or

volume (dm3) or concentration (mol/dm3 or g/ dm 3 )

Question 27

name an equation that links mass mole and molar mass

Answer 27

m = n x M

Question 28

name an equation that links volume moles volume in moles

Answer 28

V = n x 24

Question 29

name an equation that links moles concentration volume

Answer 29

n = c x V

Question 30

percentage yield

Answer 30

actual mass of product formed ÷ maximum theoretical mass of products possible
× 100

Question 31

Atom economy

Answer 31

relative formula mass of desired product from equation ÷ sum of relative formula masses of all reactants from equation
x 100

Question 32

Uncertainty

Answer 32

mean of repeated data* ±(1/2 x range of data)

Question 33

What is the equation for magnification

Answer 33

Image size (μm)/ real size (μm)

Question 34

What is the equation for Total magnification

Answer 34

Eyepiece lens magnification × objective lens magnification

Question 35

What is the equation for Rate

Answer 35

10000 ÷ time

Question 36

What is the equation for BMI

Answer 36

Weight(kg) ÷ (height(m))²