Chemistry. Please help me to answer these questions.

1.a.

1.b.

1.c.

A student working for a local grocery store is packing eggs into cartons that hold a dozen eggs. Set up the problem below and calculate the number of cartons that are equal to 576 eggs. 576 eggs X cartons - Drag and drop your selection from the following list to complete the answer: 12 eggs 1 carton 1 egg 12 cartons Set up the problem below and calculate the number of hours in exactly 25 weeks. Place your conversion factors in order such that "weeks" cancels first. 25 weeks x - hours Drag and drop your selection from the following list to complete the answer: 25 days 7 days 1 week 1 hour 24 days 7 weeks 24 hours 25 weeks 1 day Classify each of the following pure substances as either an element or a compound: sodium hydroxide tin sodium chloride