6. Which is the smallest particle?
- An atom
- A star
- A speck of dust
- A grain of sand
7. The following chemical reaction occurs: N2 + 3 H2 -> 2 NH3 How many atoms of hydrogen are there in the product?
- 6 atoms of Hydrogen
- 3 atoms of Hydrogen
- 5 atoms of Hydrogen
- 2 atoms of Hydrogen