Which of the following is Not true of atoms?

a. they are combined to form molecules

b. they combine to form compounds

Suppose the half-life is 35.5 s for a first order reaction and the reactant concentration is 0.0700 M 28.6 s after the reaction starts. How many seconds after the start of the reaction does it take for the reactant concentration to decrease to 0.

What other piece of information is needed to tell if a molecule that contains hydrogen and oxygen atoms can form hydrogen bonds?

A bag contains a mixture of copper and lead BBs. The average density of the BBs is 9.60g/cm3. Assuming that the copper and lead are pure, determine the relative amounts of each kind of BB. Express your answers numerically separated by a comma.

Which of the following represents a pair of isotopes? Select one: a. 146C, 147N b. 11H, 21H c. 136C, 147N d. O2, O3 e. 3216S, 3216S2 - Check

The decomposition of water into hydrogen gas H2 and oxygen gas O2 can be modeled by the balanced chemical equation ...

A scientist has two solutions, which she has labeled Solution A and Solution B. Each contains salt. She knows that Solution A is salt and Solution B is salt. She wants to obtain ounces of a mixture that is salt.

Reactions that affect the nucleus of an atom are called? A. Fusions B. Radioactive decays C. Nuclear reactions D. Fissions

The amplitude of a wave is most directly related to what wave characteristic? Crest length Frequency Wavelength Wave height

Why is oil unable to dissolve well in water? Water is polar and oil is nonpolar, which means they have no attraction for each other. Oil molecules are too large to fit between the closely spaced water molecules in the liquid state.

The fertilizer ammonium sulfate is prepared by the reaction between ammonia and sulfuric acid. How many kg of ammonia are needed to produce 1x10^5 kg of (NH4) 2SO4?