a pure substance that can't be broken down into simpler substances by chemical or physical means.

A. chemical

B. atom

C. element

D. mineral

A bottle of acetone (fingernail polish remover) contains 55.0 mL of acetone. If the acetone has a mass of 43.5 g, what is the density of acetone?

What volume of a 0.25 M solution can be made using 0.75 moles of Ca (OH) 2

A 5.0L container is filled with H2 gas at STP. Predict what happens with the conditions of the gas change as described below (increase, decrease or stays the same).

You have a sample of zinc (Zn) and a sample of aluminum (Al). You have an equal number of atoms in each sample. Which of the following statements concerning the masses of the samples is true? A.

What evidence is there that electrons move around in definite pathways around the nucleus? What evidence is there that electrons m

Which fossil fuel is the most widely consumed in the United States? A. petroleum B. natural gas C. peat D. coal

Why is the use of natural gas as a full becoming more common

A swimming-pool worker wants the pool's pH to be 7.2. She comes by to test the water and finds that the pH is 9.2. What should she do to correct this situation? A. Add water. B. Add base. C. Add acid. D. Do nothing.

What type of rock is sandstone

According to the Br? nsted-Lowry theory, water A. acts as a base when it accepts a hydrogen ion. B. can be neither an acid nor a base. C. can act as an acid by accepting hydrogen ions. D. can accept but not donate hydrogen ions.