Substance that undergoes a change in a chemical reaction is

a. a product

c. a reactant.

b. a chemical.

d. an enzyme.

How many grams of a stock solution that is 87.5 percent H2SO4 by mass would be needed to make 275 grams of a 55.0 percent by mass solution? Show all of the work needed to solve this problem.

13. What is the molar mass of (NH4) 3PO4? (Use whole number molar masses) * a. 113 g b. 121 g c. 149 g d. 339 g 14. What is the mass of oxygen in 300 g of sulfuric acid (H2SO4) ? * a. 64 g b. 196 g c. 210 g d. 300 g

The vitamin A molecule has the formula C20H30O, and a molecule of vitamin A2 has the formula C20H28O. Determine how many moles of vitamin A2 contain the same number of atoms as 1.000 mol vitamin A.

What is the stable configuration of the nitride ion (N^-3)

Suggest 2 reasons why copper should not be disposed in landfill sites

Which two bases pair with each other?

What is the main cause of increased erosion

Where should you keep your glass of soda if you want it to remain fizzy

Why do the atoms in a piece of copper metal have no net charge? -The charges of the positive and negative copper ions cancel each other out. -The number of electrons surrounding each copper nucleus doesn't change.

In a closed system, the total heat given off by warmer substances equals the total heat energy gained by cooler substances (qwater = - qliquid).