Conversions

Conversions

Many times in science we must behave a calculation where we convert one quantity to an differentwise. life at these examples to see what I mean:

1. Convert 80 inches to feet. We take the conversion factor of 12 inches = 1 ft but do we multiply by 12 or divide?

80 in(1 ft/12 in) shows that inches divided by inches leave behind cancel that unit out and ft is the completely unit left. This means we divide by 12 and the re processnt is 80/12

2. How many calories is 1200 joules?

We need the conversion factor of 4.184 J = 1 cal but again do we multiply by this number or divide? Cancel out J and youll see that we must divide by 4.184J

1200 J(1cal/4.184 J) = 286.8 cal

3. 1.5 moles of oxygen catalyst is how many grams?

The conversion factor here is the molecular exercising weight of oxygen, which is 1 mole = 32 grams O2.

1.5 moles O2(32 gms/1 mole O2)= 48 grams O2

4. 60 grams of O2 is how many moles?
60 grams O2( 1 mole of O2/32 grams O2) = 60/32=1.875

5. Density type calculations. We need the elucidate equation , which is D=m/V (m is mass, v is pile)

We need to put everything we know on one side and what were feel for on the other side by itself. Sometimes this will require that we rearrange the equation.

Basically, if we know 2 of the 3 cost in the above equation we can solve for the other quantity.





If the mass of metal is 26 gms and it occupies a vol of 13 cm3, what is the niggardliness?

D=m/v so D = 26/13 = 2gms/cm3

How approximately if we know the density and the volume, can we solve for the mass? Yes.

If an object has a density of 0.8 and occupies a volume of 20 mls what is the mass? The equation we need is

mass = DxV so the answer is 0.8 x 20= 16 gms

There atomic number 18 3 equations here, one solving for D, m and v.

I map a little memory aid that combines all 3 equations into one picture. It tells me what the right equation is.

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