Question
The equation for the reaction between barium chloride and dilute sulfuric acid is shown.
BaCl2 + H2SO4 → BaSO4 + 2HCl
Which row shows the state symbols for this equation?
Answer/Explanation
Ans:
A
Question
The electronic structures of atoms P and Q are shown.
P and Q form an ionic compound. What is the formula of the compound?
A. PQ B. \(P_{2}Q\) C. \(P_{2}Q_{3}\) D. \(PQ_{2}\)
Answer/Explanation
Ans:
D
Question
Sodium nitride contains the nitride ion, \(N^{3-}\). Sodium nitride is unstable and decomposes into its elements. What is the equation for the decomposition of sodium nitride?
A. \(2NaN_{3}\rightarrow 2Na+3N_{2}\)
B. \(2Na_{3}N\rightarrow 6Na+N_{2}\)
C. \(2NaN_{3}\rightarrow Na_{2}+3N_{2}\)
D. \(2Na_{3}N\rightarrow 6Na+2N\)
Answer/Explanation
Ans:
B
Question
Compound X contains carbon, hydrogen and oxygen only. By mass, it contains 26.7% carbon and 2.2% hydrogen. What is the empirical formula of X?
A. CHO B. \(C_{2}HO\) C. \(CH_{2}O\) D. \(CHO_{2}\)
Answer/Explanation
Ans:
D