1. Clicker Questions

2. Clicker #1
To balance a chemical equation, it may be necessary to adjust the
coefficients.
subscripts.
formulas of the products.
number of products.

3. Clicker #2 Prefixes are used in what kind of compounds? metallic.
ionic.
covalent.
acidic.

4. Clicker #3 What would be the correct formula for aluminum sulfate?
AlSO4
Al2SO4 3
Al3(SO4)2
Al2(SO4)3

5. Clicker #4 What would be the correct name for Al2S3? Aluminum Sulfide
Aluminum (III) Sulfide
Diboron Trisulfide
None of the above

6. Clicker #5 What is the formula mass for iron (III) hydroxide? 73 amu

7. Clicker #6
Which coefficients correctly balance the formula equation CaCO3(s) → CaO(s) + CO2(g)?
1, 1, 1
1, 3, 1
2, 6, 3
3, 1, 2

8. Clicker #7
Which coefficients correctly balance the formula equation NH4NO2 → N2 + H2O?
1, 2, 2
1, 1, 2
2, 1, 1
2, 2, 2

9. Clicker #8
Lead (III) chloride reacts with calcium hydroxide to form calcium chloride and lead (III) hydroxide. What are the coefficients for this reaction?
3, 2, 2, 3
2, 3, 2,2
2, 3, 3, 2
None of these

10. Clicker #9 What is the percent by mass of carbon in acetone, C3H6 O?
20.7%
1.61%
30.0%
62.1%

11. Clicker #10
The lowest whole-number ratio of the elements in a compound is called the ____.
binary formula
molecular formula
empirical formula
representative formula

12. Clicker #11 What would be the best name for Cr(OH)3?
Mono Chromium trioxide trihydride
Chromium (III) hydroxide
Chromium Trioxide Trihydride
Chromium Hydroxide

13. Clicker #12 Chemical equations must be balanced to satisfy ____.
the law of definite proportions
the law of multiple proportions
the law of conservation of mass
Avogadro’s principle

14. Clicker #13 Which of the following could be an empirical formula? N2O5
N2H6
More than one could be an empirical formula

15. Clicker #14
If a compound has an empirical formula of COH2, has a molecular weight equal to 60. g/mol, what is the molecular formula?
C3O1H6
 C2O2H4
C1O2H16
C3O3H6

16. Clicker #15 What is the formula for tetraphosphorus hexoxide? 4P7O

17. Clicker #16 What is the formula for magnesium iodide? MgI MgI2 Mg2I

18. Clicker #17 What would be the best name for K3PO4? Potassium Phosphate
Potassium (I) Phosphate
Tripotassium Phosphate
Potassium Phosphide Oxide

19. Clicker #18
In every balanced chemical equation, each side of the equation has the same number of ____.
coefficients
moles
molecules
atoms of each element

20. Zn(OH)2 + CH3COOH → Zn(CH3COO)2 + H2O?
Clicker #19
Which coefficients correctly balance the formula equation
Zn(OH)2 + CH3COOH → Zn(CH3COO)2 + H2O?
1, 2, 1, 1
2, 1, 2, 1
1, 2, 1, 2
2, 1, 1, 2

21. Clicker #20
What is the balanced equation when aluminum reacts with copper(II) sulfate to produce aluminum sulfate and copper?
Al + Cu2S →Al2S + Cu
2Al + 3CuSO4 → Al2(SO4)3 + 3Cu
Al + CuSO4 → AlSO4 + Cu
2Al + Cu2SO4 → Al2SO4 + 2Cu

22. Clicker #21
The percent composition of aluminum in aluminum hydroxide is:
50%
25%
14%
None of the answers are correct

23. Clicker #22 N2S3 is properly named: nitrogen sulfide
nitrogen (III) sulfide
nitrogen (II) sulfide
None of the answers are correct

24. Clicker #23 The red numbers in the image below represent ________
subscripts
Coefficients
I don’t know, and don’t want to try
None of the answers are correct

25. Clicker #24 The blue numbers in the image below represent ________
I don’t know, and don’t want to try
Coefficients
Subscripts
None of the answers are correct

26. Clicker #25
In a reaction in which hydrogen reacts with oxygen to produce water, which substances are the reactants?
hydrogen only
oxygen only
water
both hydrogen and oxygen

27. Clicker #26 11. How many atoms of oxygen are represented in 2Ca(NO3)2?4 6 10 12