[Lisa]

Hi everyone,

I just started chemistry and am already having trouble. I need to find some formulas but my school's text isn't very good and only lists some of them. I've tried google but could not find anything specific to my question. What I need are formulas to these sample questions:

1. A sculptor is preparing to cast a bronze figure. The figure has a volume of 220.0 mL and a density of 7.800 g/mL. How many grams of bronze does the sculptor need in order to cast the figure?

2. What mass of aluminum must you have if a block absorbs 625 joules of heat energy with a resulting temperature change of 5.0 Celcious?   

3. What is the change in temperature that will occur when 950.0 g of silver absorbs 1200.0 joules of heat energy? (specific heat of silver= 0.236 J/g Celcious)

If someone could please post the formulas to use with those problems, I would really appreciate it.

[Albert]

#1: You don't need an equation, but you have to solve a proportion:

7.800g : 1mL = x g : 220.0 mL

Your answer is x.

#2 and #3: check out http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/spht.html