A particle model of chemical reactions

12 questions

1. Which of these is true about elements?
2. A metal sulfate contains the group of elements -SO₄, nitrates have the group -NO₃ and ___ have the group -CO₃.
3. What elements are present in the calcium chloride?
4. What of the following is an example of a molecular element?
5. Match the reacting elements with the compound formed.
6. What indicates a compound in a chemical formula?
7. Match the word with its definition.
8. In a chemical reaction, what happens to the atoms?
9. In the chemical equation 2H₂ + O₂ → 2H₂O, what are the reactants?
10. Which of the following is a characteristic of a chemical reaction?
11. After the reaction 2H₂ + O₂ → 2H₂O, what happens to the total number of atoms?
12. In the equation 2Na + Cl₂ → 2NaCl, what is the simplest ratio of sodium (Na) atoms to chlorine (Cl) atoms in the reactants?

License: OGL