Can someone please help me? I am so lost 1. When a salt dissolves in water it is
ID: 907421 • Letter: C
Question
Can someone please help me? I am so lost
1. When a salt dissolves in water it is identified with the symbol
2. Which of the following compounds would be identified with the symbol (s)? AgNO3 NaCl Cu(NO3)2 HCl AgCl
3. When the reaction shown is correctly balanced, the coefficients are: Li (s) + CuSO4 (aq) à Cu (s) + Li2SO4 (aq) The coefficient on Lithium is 1, 2, 3, 4 or 5
4. When the following reaction is balanced the coefficient in front of carbon dioxide is: ____ C5H12 + ____ O2 ____ CO2 + ____ H2O 5 6 12 10
5. The reaction 2 AgNO3 (aq) + K2SO4 (aq) 2 KNO3 (aq) + Ag2SO4 (s) is an example of a(an) _____ reaction.
6. How many grams are in 3.2 moles of NO2 ? 147.2 30.0 46.0 96.0 1.9 x 1024
7. The molecular weight of PCl3 is _____ amu
8. The formula weight of copper(II) chloride is _____ g
9. How many molecules are present in 3.40 mol of CCl4?
10. 42.0 g Cl2 contains _____ molecules Cl2
11. How many grams are there in 5.00 moles of NH3
12. In the reaction shown, how many moles of HCl are needed to react with 5.3 moles of Al? 2 Al + 6 HCl 2 AlCl3 + 3 H2
13. How many grams of C will be consumed when 5.00 grams of Na2SO4 react according to the balanced reaction shown? Na2SO4 + 2 C Na2S + 2 CO2
14. The following equation represents the formation of nitrogen dioxide, a major component of smog, 2 NO + O2 2 NO2 If 0.68 mole of NO is reacted with 0.79 mole of O2 to produce NO2, the limiting reactant is _____.
15. The theoretical yield of a reaction is 75.0 grams of product and the actual yield is 42.0g. What is the percent yield? 16. What are the coefficients for the following reaction when it is properly balanced? ___potassium iodide + ___lead (II) acetate ___lead (II) iodide +___potassium acetate
17. A process or reaction which releases heat to the surroundings is said to be?
18. P4 (s) + 10 Cl2 (g) 4 PCl5 (s) H = -435.2 kcal The reaction above is?
19. Entropy can be defined as?
20. All chemical equations need to be balanced because?
21. In the reaction A + B AB, which of the following will not increase the rate?
22. Consider the reaction: 2 CO (g) + O2 (g) symbol 2 CO2 (g) The equilibrium expression for this reaction is?
23. For the following reaction, adding oxygen will cause the equilibrium to _____.
2 SO2 (g) + O2 (g) symbol 2 SO3 (g) + heat
24. Which of the following reactions would be the slowest? Activation energy = 10 kcal/mol Activation energy = 20 kcal/mol Activation energy = 50 kcal/mol Activation energy = 100 kcal/mol
25. The following equation is an example of which type of reaction. Zn + CuSO4 --> ZnSO4 + Cu
26. 2 Al2O3 (s) 4 Al (s) + 3 O2 (g) G = +138 kcal Consider the contribution of entropy to the spontaneity of this reaction. As written, the reaction is _____, and the entropy of the system _____.
27. In the process of dissolving sugar in water, the entropy increases. This means that the sign of S is _____, and that the randomness of the system _____.
Explanation / Answer
1. When a salt dissolves in water it is identified with the symbol
When a salt dissolves, i.e. NaCl --> Na+(aq) + Cl-(aq) we use "(aq)" to denote aqueous solution
2. Which of the following compounds would be identified with the symbol (s)? AgNO3 NaCl Cu(NO3)2 HCl AgCl
The only compound that must have (s) is the precipitate. You need to know the basic rules of solubility. You will find out that AgCl is note soluble, therefore it will be in precipitate (s) solid form
3. When the reaction shown is correctly balanced, the coefficients are: Li (s) + CuSO4 (aq) à Cu (s) + Li2SO4 (aq) The coefficient on Lithium is 1, 2, 3, 4 or 5
Li (s) + CuSO4 (aq) = Cu (s) + Li2SO4 (aq)
2 Li(s) + CuSO4(aq) = Cu(s) + Li2SO4(aq)
The coefficient must be 2
4. When the following reaction is balanced the coefficient in front of carbon dioxide is: ____ C5H12 + ____ O2 ____ CO2 + ____ H2O 5 6 12 10
This is pretty obvious, 1 mol of C5H12 --> needs to have 5 mol of C, therefore, CO2 --> 5CO2
the answer is 5
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