An atom of potassium-37 and an atom of potassium-42 differ in their total number of

(1) electrons (3) protons

(2) neutrons (4) positrons

The temperature of a body of water influences

Are phase changes physical or chemical changes? why?

Which is a cause of polarity in water molecules?

How many electrons did magnesium give to each chlorine atom

The unsaturated hydrocarbons will react readily with other elements or compounds. True False

How is the Gobi Desert different from the Sahara Desert

Which average wind speed do areas need to effectively power wind farms? A:1 mph B:5 mph C:10 mph D:16 mph

What is the total number of moles represented by 20 grams of CACO3 A. 0.1 B. 0.2 C. 1 D. 2

Which describes the polarity in a water molecule? a). partial negative charge on the oxygen atom because its electrons are pulled toward the hydrogen atoms b).

To what temperature in kelvin will a 2.3 L balloon have to be heated to expand to a volume of 400 L Assume the initial temperature of the balloon is 25 degrees celsius.