Which of the following is a source of chemical energy commonly used by humans? A. water flowing in a river B. a bicycle C. a sandwich D. turning on a lightswitch

Which type of compound is least likely to dissolve in water? a salt a highly polar compound a compound with only london forces a nonpolar compound a compound with hydrogen bonds

In the balanced redox reaction 2 Al (s) + 6 HCl (aq) → 2 AlCl3 (aq) + 3 H2 (g) 80.0 mL of 2.0 M HCl would (theoretically) react with how many grams of Al (s) ? Assume that the reaction is quantitative. A. 1.44 g B. 4.32 g C. 1,440 g D. 2,030 g E.

What are the atomic number and mass number of the beta particle?

The smallest part or fragment of an atom

Heptane gas reacts with oxygen gas to give carbon dioxide gas and water vapor (gas). If you mix heptane and oxygen in the correct stoichiometric ratio, and if the total pressure of the mixture is 300 mm Hg, what are the partial pressures of heptane

How much of a 15.0M stock solution do you need to prepare 250ml of a 2.35ml hf solution?

A synonym for dwindled

A material that cannot be broken down farther by chemical means

How many of the following elements have 2 unpaired electrons in the ground state? C Te Hf Si A) 1. B) 2. C) 3. D) 4.

Which has a higher frequency, a neutron or electron? Why?