The half life of a certain substance is 28 years. how long will it take for a sample of this substance to decay to 78% of its orginal amount.

A person drinks eight glasses of water each day, if each glass contains 300mL how many liters of water does a person drink in a year?

Ions are atoms that have an electrical charge because they have gained electrons or lost electrons. If a neutral atom GAINS an electron, what is it's charge? Positive Negative Neutral

What is the mass in grams of one mole of any substance know as

Lithium (Li) and oxygen (O) are both in period 2. They both have? a. similar properties b. the same number of protons c. two electron shells d. the same number of electrons

We divide the electromagnetic spectrum into six major categories of light, listed below. Rank these forms of light from left to right in order of increasing wavelength. To rank items as equivalent, overlap them.

When an aqueous solution of silver nitrate is mixed with an aqueous solution of potassium chloride which are the spectator ions?

Investigating changes in colligative properties involves the measurement of a solution's concentration in molality instead of molarity because

Consider the following representation of a reaction mechanism. Step 1: Unimolecular (fast) Step 2: Bimolecular (slow) Step 3: Unimolecular (fast) Which conclusion about the rate law for the reaction above is reasonable? A.

1. Which of the following best describes an example of pure chemistry? a) testing the effects of lower concentrations of a drug on humans b) studying chemicals containing carbon c) developing a cure for osteoporosis d) finding an antidote for a new

Problem 1: For which of the following activities might you want to hire a chemist? A. building a garage B. testing a sample of water from a well C. finding a comet D.