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.

Which correctly describes the laws of conservation? A. Mass is not conserved in a chemical reaction. B. Energy is not conserved in a nuclear reaction. C. Mass is conserved in a nuclear reaction. D. Energy is not conserved in a chemical reaction.

30. In a common experiment in the general chemistry laboratory, magnesium metal is heated in air to produce MgO.

Robert uses a spring scale to measure force. What are the units of his measurements? A. Pascals B. Volts C. Joules or D. Newtons

12. If the total pressure exerted by 3 gases is 45 atm and each individual gas has the same pressure, what is the pressure of each gas?

What things contain polyvinyl alcohol (pva) other than school glue and face masks?

Compare and contrast the two kinds of chemical bonds (ionic and covalent)

If a thin and a thick wire are otherwise identical, what property is lower for the thicker wire? 1. current 2. static charge 3. resistance 4. voltage

Which set of numbers gives the correct possible values of l for n = 2?

Light from the sun is absorbed by the ground and converted to what?

What contains paired statements that can be used to identify orgainisms