10. What are the predicted products from the following decomposition reaction? NaHCO3 (s) à A) Na, H2, and CO2 B) Na2CO

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10. What are the predicted products from the followingdecomposition reaction? NaHCO3 (s) àA) Na, H2, and CO2
B) Na2CO3 and H2OC) Na2CO3, H2, and CO2
D) Na2CO3, H2O, and CO22
12. What is the percent by mass of water in the hydrate Na2SO4 •5 H2O?A) 22.7 %
B) 36.1 %
C) 42.8 %
D) 49.2 %
17. Which of the following pairs of elements are likely to forman ionic compound?
A) Li and Cl
B) C and H
C) C and C
D) Na and Mg
23. Use the periodic table and predict which of the followingelements forms a gas at 25°C.A) Cu
B) Co
C) Cl
D) Ca