1. what is the percent composition of caco₃? show your work.

2. what is the mass of sodium in 50 grams of salt? show your work.

3. what two general products do combustion reactions create?

4.

In an energy pyramid, which level has the most available energy?

Use the drop-down menus to answer each question. which runner finished the 100 m race in the least amount of time? which runner stopped running for a few seconds during the race? at what distance did anastasia overtake chloe in the race?

Match the name of the following compound:   mgso4  · h2omagnesium sulfate monohydratemagnesium (ii) sulfate monohydratemagnesium (ii) sulfate hydratemagnesium sulfate hydrate