Why do we need to study chemistry?

Deterioration of buildings, bridges, and other structures through the rusting of iron costs millions of dollars every day.

If you could measure the mass of the substances inside the cup before and after the reaction, you would see that the mass decreased over a course of the reaction. Explain the difference.

What is the molar mass of a substance? A.) the mass in grams of one mole of a substance B.) the number of particles in one gram of a substance C.) the number of moles in one gram of a substance D.) the mass in grams of one particle of a substance

How many moles of NaCl are in 25.0 mL of 3.2 M solution?

Each of the measurements below describes length. Rank them from longest length to shortest length. 1mi, 10m, 1x10^11nm, and 50in.

What is the percent by mass of solute if 14.60g 74.95g of water?

7 An atom that has 13 protons and 15 neutrons is an isotope of the element (1) nickel (3) aluminum (2) silicon (4) phosphorus

The graph below shows how solubility changes with temperature. What is the solubility of Na2HAsO4 at 60°C? 20 g/100 mL of water 46 g/100 mL of water 65 g/100 mL of water 70 g/100 mL of water

Which statement regarding water is true? Energy must be given off in order to break down the crystal lattice of ice to a liquid. Hydrogen bonds are stronger than covalent bonds. Liquid water is less dense than solid water.

Which of the following elements has the fewest valence electrons?. a. beryllium. b. boron. c. carbon. d. lithium