How many atoms of S are in the following formula: 3Na(SO4)2

1) 6
2) 8
3) 3
4) 5

What is the result of multiplying (2.5 × 1010) × (2.0 × 10-7)? a. 5.0 × 103 b. 5.0 × 10-3 c. 5.0 × 1017 d. 5.0 × 10-17

Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.

The footprints of a dinosaur and the burrow of an ancient shrimp are examples of which kind of fossils