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Clicker Questions.

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Presentation on theme: "Clicker Questions."— Presentation transcript:

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


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