How do you convert?

Question

(a) 4.50 Cal to calories
(b) 600.0 Cal to kilojoules
(c) 1.000 J to calories
(d) 50.0 Cal to joules

Answer 1

I wish teachers would get away from Calories vs calories. A Calorie (with a capital C, sometimes called a "big calorie" actually is a kilocalorie and should be addressed as such.
So 1 Cal = 1000 calories.
There are 4.184 joules in 1 calorie.
You can convert from anything to anything if you know the conversion factor. I gave those to you above. Here is how you do the 4.5 Cal to calories.
?calories = 4.5 Cal x (1000 calories/1 Cal) = xx
Note that the conversion factor of (1000 calories/1 Cal) is arranged (placed 1000/1Cal and not 1 Cal/1000 calories) so that the unit Cal in the numerator and denominator cancel and the unit left is the unit you want for the answer.
All of the others are done the same way. Someone will be glad to check your answers if you care to post them.