120 students took a chemistry test. 22 scored a 90.55 scored an 80, 12 scored a

70, 11 scored a 60, and 20 scored a 50. Calculate the weighted average of the test

scores.

When heat energy is added two changes are observed: Change A: solid changes phases to a liquid Change B: liquid changes phases to a gas What are the names or phase changes in A and B

The solubility of KNO3 (s) in water increases as the ... a. Pressure on the solution decreases b. Temperature of the solution increases c. pressure on the solution increases d. Temperature of the solution decreases

How does ice rain and wind change rocks

If the concentration of h2 is doubled, will the reaction rate quadruple, double, or remain the same?

What is earths surface made of?

Two components combine to create a binary ionic compound. Name one of them

True or false. The synthesis of giant molecules from components of repeating units is polymerization.

Which term names an environmental cost of fossil fuel consumption? A. cheap energy B. increased greenhouse gases C. renewable resource D. low pollution

Slowly heating butter in a pan until it changes from a solid to a liquid is an example of a physical change. True False

Action - reaction forces don't cancel each other. A. True B. False