Hey, so i've been doing my summer chemistry homework assignment and it is proving to be rather difficult.
So I had to classify the substances as either pure substances or mixtures and if it was a mixture hetero. or homo., this is what I got:
a) concrete - pure substance
b) sea water- homo. mixture
c) magnesium- pure substance
d) gasoline- homo. mixture
e)air- homo mixture
f) tomato juice- homo mixture
g) iodine crystal- pure substance
e) A nickel- pure substance
I'm not sure on a few of these answers and feedback would be really helpful =]=]
A solid white substance A is heated strongly in the abssence of air. It decomposes to form a new white solid substance B and a gas C. THe gas has exactly the same properties as the product obtained when carbon is burned with excess oxygen. What can you say whether solids A and B and the gas C are elements or compounds?
I put that:
These are calculations problems that I have no idea what to do though i've tried various techniques yet i have been getting varying answers.
1. Calculate the mass of 1.00 ft^3 of gold metal.
my final answer was 588.87 grams but I am very unsure.
2. Calculate the mass of 12.0 cm sphere of lead metal.
I am really confused on how to do this question.
3. THIS ONE IS SOOO HARD!!!!
A 200.00mg piece of gold can be hammered into a sheet that is 2.4 ft by 10ft. a) what is the thickness of this sheet in m?? (b) quote the answer using the SI prefix so that there is no exponent needed.
THANK YOU FOR ANY HELP YOU GIVE!!!