Derek works 43 hours at a rate of pay of $15 per hour. He receives double pay over 40 hours. What is his gross pay?

A. $800

B. $720

C. $780

D. $690

How do isotopes of a given element differ? How am they similar?

In this chemical reaction, 325 grams of barium (Ba) react completely. How many moles of lithium (Li) are produced?

Reduce, reuse, recycle! Soft drinks come in aluminum cans that are readily recycled. Storage of empty cans is never a problem, since aluminum cans are easily crushed because they are very A) conductive. B) magnetic. C) malleable. D) soluble.

Select the correct answer. In an isolated system, two copper bars at different temperatures transfer energy until both are at the same temperature.

What human activities have change earth

In ionic bonds, valence electrons are

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