How many valence electrons are in the cyclohexylidene ion C6H+210

There are questions in the math section of the Aspire test.

If an element has 4 protons and 5 neutrons its mass number is

Bond polarity occurs when the two atoms on a bond are different Would you expect the C-F bond to be polar in CHF3 molecule? Hint: Consult the electronegativity table posted in slide 230 and account for the difference.

Which of the following lenses is a converging lens? A. Convexo-concave lens B. Plano-concave lens C. Spherical-convex lens D. Double-convex lens

Which of the following defines the rate at which a solute dissolves into a solvent? a. rate of dilution b. rate of dissolution c. solvent velocity d. rate of refraction

The electron configuration 1s22s22p63s23p6 represents which noble gas?

What are some disadvantages of incinerators?

What mass of potassium chlorate would contain 40grams of oxygen?

Identical forces act for the same length of time on two different masses. The change in momentum of the smaller mass is A) smaller than the change in momentum of the larger mass, but not zero. B) zero.

How many nuclei of 238 92 U 92 238 U remain in a rock if the activity registers 290 decays per second? (Note that the half life of Uranium-238 is 4.468x109 years)