How many wilderness areas are there in the United States?

a.

25

b.

50

c.

120

d.

474

Noble gases tend to have what oxidation number Question options: +1 +2 -1 0

How does the global positioning system locate objects on Earth

What is the molarity of 10.0 g of kcl in 0.500 l of solution

Which of the following best describes an electron? A. It has no charge and about the same mass as a proton. B. It has a negative charge and much less mass than a proton. C. It has a positive charge and much more mass than a neutron. D.

How is an exothermic reaction identified on a potential energy diagram?

Calculate the energy difference for a transition in the paschen series for a transition from the higher energy shell n=4. express your answer to four significant figures and include the appropriate units.

While performing an experiment on the enzyme amylase, Macy uses three different pH solutions: pH 3.0, pH 4.0, and pH 6.7. She finds that all the starch is broken down fastest at pH 6.7. How would you justify these findings? A.

By which process do light rays pass through window glas 1conduction 2convection 3radiation 4compression

What will most likely happen if a light wave moves theough a solid?

How does an atom become a positively charged ion? by gaining one or more electrons by gaining one or more neutrons by losing one or more electrons by losing one or more neutrons