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1. Based on the reactants only classify each of the following reactions as synthesis, decomposition, single replacement, double replacement, or neutralization.
(a)Zn(s) l+MgSO4(s) =?
(b)Ca(s) + O2(g) =?
(c)HgO(s) =?
(d)HCl(l) + KOH(s) =?
(e)ZnSO4(s) + SrCl2(s) =?
(f)HNO3(aq) + Sr(OH)2(s) =?
(g)Sr (s) + O2(g) =?
(h)AlCl3(s) + Na2CO3(s) =?
2.complete the equations in question C1 by predicting the products.
3.Balance the equations in question C1.
4.a)Describe how a chemical change and a physical change are the same.
b)Describe how a chemical change and a physical change are different.
5.(a) List all the things that a chemical equation tells you.
(b)What does a chemical equation not tell you ?
6.The following expression contains a major error. Explain what is wrong and rewrite the expression so that it becomes a correctly balanced equation.
Al(s) + H3PO4(l)=
H3(g) + AlPO4(s)
When two ionic compounds react (actually, one can be an acid), it is likely double displacement. But if one is an acid and the other is a base, then it is neutralization.
A metal reacting with an ionic compound (or acid) to give a different metal (or hydrogen) and another ionic compound (or acid) is likely a single displacement.
When a single compound undergoes a reaction, it is likely to be a decomposition. When two elements react, it is a synthesis.
Given those, I can answer 1:
(a) single displacement
(b) synthesis
(c) decomposition
(d) neutralization
(e) double displacement
(f) neutralization
(g) synthesis
(h) double decomposition
In a double displacement, the two ions swap counter-ions. Similarly in a neutralization the acid's anion pairs with the base's cation, leaving H+ and OH- to react to form water. In a single displacement, the two cations swap (one can be hydrogen). In a synthesis, the most stable possible binary compound is formed; in a decomposition, two elements are formed. Now I can answer 2.
(a) Mg, ZnSO4 (but you can't carry out this reaction.)
(b) CaO(s)
(c) Hg(l), O2(g)
(d) KCl(aq), H2O(l) (why is the HCl in the liquid state? I would think that it should be aqueous!)
(e) ZnCl2, SrSO4 (they should both be aqueous; not sure what's wrong with the questions you were given)
(f) Sr(NO3)2(aq), H2O(l)
(g) SrO(s)
(h) Al2(CO3)3, NaCl (again, they should both be aqueous)
3 is the easy part.
(a) Zn(s) + MgSO4(s) -----> ZnSO4(s) + Mg(s)
This reaction will NOT take place.
(b) 2Ca(s) + O2(g) -----> 2CaO(s)
(c) 2HgO(s) -----> 2Hg(l) + O2(g)
(d) HCl(aq) + KOH(s) -----> KCl(aq) + H2O(l)
(e) ZnSO4(aq) + SrCl2(aq) -----> ZnCl2(aq) + SrSO4(s)
(f) 2HNO3(aq) + Sr(OH)2(s) -----> Sr(NO3)2(aq) + 2H2O(l)
(g) 2Sr(s) + O2(g) -----> 2SrO(s)
(h) 2AlCl3(aq) + 3Na2CO3(aq) -----> Al2(CO3)3(s) + 6NaCl(aq)
4. a) Physical and chemical changes are both able to change physical properties such as appearance, density, and heat conductivity.
b) Physical changes cannot change chemical properties such as reactivity with acid or combustibility, whereas chemical changes can.
5. (a) A proper balanced chemical equation tells you the formulae of the reactants, the formulae of the products, the mole ratios of the substances involved, and all of the states, as well as the direction in which the reaction is going.
(b) A chemical equation does NOT tell you any other properties of the substances, nor does it tell you the mechanism of the reaction, how much energy is released/given off, how fast it is (rate), and so on.
6. It is wrong because hydrogen forms H2 molecules, not H3 molecules. It should be:
2Al(s) + 2H3PO4(l) -----> 3H2(g) + 2AlPO4(s)
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