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#1. According to the Law of Conservation of Mass, which statement is correct?
#2. In an experiment, 5 g hydrogen reacts completely with 40 g oxygen. What mass of water is formed?
#3. Which observation proves that a chemical reaction has occurred when baking soda reacts with vinegar?
#4. Water collected from rivers, wells and oceans always contains hydrogen and oxygen in the mass ratio:
#5. Which scientist proposed the Law of Definite Proportions?
#6. Assertion (A): Atoms combine in simple whole number ratios. Reason (R): Atoms are destroyed during chemical reactions.
#7. Which molecule contains a double covalent bond?
#8. Nitrogen has 5 valence electrons. How many electrons are shared in one molecule of nitrogen (Nâ‚‚)?
#9. Which compound is correctly named?
#10. Which of the following is an ionic compound?
