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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

3
5
6
9
12

Question 39 Multiple Choice 20 points
CH3NH2 represents a/an

alcohol
alkyne
amine
ester

Question 40 Multiple Choice 20 points
How many protons and electrons are present in Bromine?

80 protons, 35 electrons
45 protons, 35 electrons
35 protons, 45 electrons
35 protons, 35 electrons

Solution Preview

Questions 36
Those atoms are called: isotopes

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.

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