10 Quastions in all! I NEED HELP PLEASE HAVE MERCEY I PLEED! :(:(:(

 

21.  List 3 indicators of a chemical change.

a.    _____________________

b.    ____________________

c.    ____________________

 

 

 

22.  Check the following problem for errors. If you find an error, identify it, tell why it is an error and correct the error solving the problem correctly. Convert 0.45 g zinc hydroxide to moles. (Hint: there are errors)

 

 

 

0.65 g ZnOH   _        82.41 mol       = 3.22 X 10 ^25 mol

 

 

                                6.02X10²³Â g  

 

23.  What is an ion? Explain how ions form. Distinguish between a cation and an anion. Be sure to use at least 3 to 4 complete content related sentences in your explanation.

 

24.  Write the symbol for the ion formed when each element gains electrons and attains a noble-gas electron configuration.

a.      Br

b.      H

c.      Se

 

25.  Name each of the compounds. There are ionic, covalent and acid/base compounds in the list.

a.      N₂H₄

b.      PI₃

c.      LiOH

26.  Classify each chemical equation as a combination/synthesis , decomposition, single replacement, double replacement, or combustion.

 

a.      Pb(s) + Hg₂SO₄(s) à PbSO₄(s) +2 Hg(l)

b.       NaCl(aq) + AgNO₃(aq) à AgCl(s) + NaNO₃(aq)

c.      2 H₂0(l)à2 H₂(g) + 0₂(g)

            

 

 

 

27.  Find the molar mass of nitric acid (HNO₃).

 

28. Avogadro’s number refers to ___.

a.   the maximum number of electrons that all of an atom’s energy levels can accommodate

b.   the number of protons and neutrons that can fit in the shells of an atom’s nucleus

c.    the number of particles in one mole of a substance

d.   the number of particles in exactly 1.0 g of a substance

 

 

29.   How many moles of oxygen atoms are in 1.5 moles of CO₂? (Sc2c)

a.      1 mol                    b. 1.5 mol           c. 2 mol               d. 3 mol

 

30.  What is the mass of 0.28 mol of iron ?

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