Some questions of general chemistry and chemical equations

I just need the answer!!!!!!!!

Question 36 Multiple Choice 20 points Atoms of the same element with different mass numbers are called:
nucleons
neutrons
allotropes
chemical families
isotopes

Question 37 Multiple Choice 20 points
Which is the correct formula for copper(II) phosphate?

Cu2PO4
Cu3(PO4)2
Cu2PO3
Cu(PO4)2
Cu(PO3)2

Question 38 Multiple Choice 20 points
When a chemical equation is balanced, it will have a set of whole number coefficients which cannot be reduced to smaller whole numbers. When the following chemical equation is balanced, what is the sum of the coefficients (do not forget to add in the coefficient one if it occurs)?
___ Al + ___ H2SO4 ___ Al2(SO4)3 + ___ H2

Question 37
The correct formula is: Cu3(PO4)2, ...

Solution Summary

The answers are given without detailed explanations. In two cases short hints are given because the question is of general importance and to make it easier to apply the rules on other similar chemical problems.

Hi
Thanks for your help with this
word equation is
sulfer dioxide + oxygen -----sulfer trioxide
Using chemical symbols, write a balanced equation for the above reaction using the lowest possible whole number coefficents, include after the chemical formulae the symbol state of the compound.
The other query is
A island

1. What scientific principle or law is used in the process of balancing chemicalequations?
2. In balancing equations, why should you not change subscripts in chemical formulas?
3. Define the terms limiting reactant and excess reactant.
4. Why are the amounts of products formed in a reaction determined only by the amount of

Question 16 Multiple Choice 20 points
In which pair are the elements most similar in their chemical properties?
Ca and Ba
S and P
Ag and Rb
Cs and Xe
Question 17 True/False 20 points
In Lewis dot structures, lone pairs are valence electrons not involved in covalent bonding.
Tr

Acetyl chloride is a colorless, fuming liquid used primarily in the chemical industry.
a) How is acetyl chloride produced? If 915 gallons is produced and shipped, will DOT require the carrier to display the flammable placard? Explain your answer.
b) When there is a bulk spill of this chemical, why is it necessary to prev

51. (a) The equations for two chemical reactions shown below are not balanced. Balance the equations by writing the appropriate coefficients in front of the formulas in the equations.
(b) Write balanced equations for the chemical reactions described below. Writ the net ionic equation where appropriate.
(i) A precipitate form

A tank initially contains 100 gallons of a solution that holds 10 pounds of a chemical. A solution containing 1 pound of the chemical runs into the tank at a rate of 4 gallons per minute, and the well-mixed mixture runs out of the tank at a rate of 6 gallons per minute.
a. How much chemical is in the tank after 25 minutes?
b