The bonds that are broken when water vaporizes are 1. Nonpolar covalent bonds 2. Covalent bonds between atoms within water molecules. 3. Hydrogen bonds between water molecules. 4. Polar covalent bonds. 5. Ionic bonds.

How many particles are in a sample of KNO3?

List the gases h2o, he, hcl, brf, and no2 in order of increasing average molecular velocity at 25◦c. 1. rates of effusion: no2 < hcl < brf < he < h2o 2. rates of effusion: brf < no2 < hcl < h2o < he 3. rates of effusion: h2o < no2 < he < brf < hcl 4.

Which of the following is true about a change from a solid to a liquid? The particles speed up. The particles slow down. The particles remain at the same energy level. The particles get closer together.

What is the approximate pH of a 0.06 M solution of CH3COOH (given that Ka = 1.78 x 10-5) ? A. 1 B. 3 C. 6 D. 7 E. 9

A scientist conducts a experiment to determine

What kind of reaction is ca (s) + h3po4 (aq) ca3 (po4) 2 (s) + h2 (g)

In the teapot dome scandal, what did the secretary of the interior albert fall lease

A Material made of equal parts is called what? A. Atom, B. Pure substance, C. Mixture

Part C Why are dichotomous keys useful in classifying a new species?

2. How is the frequency of a wave determined?