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

Which of the following is a large-scale, slow-moving natural change? A) glaciation B) hurricane C) drought D) famine

How many moles are 1.20 x10^3 grams of Nh3

An automobile tire at 30°C has a pressure of 3.00 atm. Temperature decreases to - 5°C. Assume that there is no volume change in the tire. What is the new pressure of the tire after the temperature change?

How many grams of mercury would be contained in 15 compact fluorescent light bulbs?

Which of the following elements is the most nonreactive? H, fe, Au, O, Ne

To make sure that the white powder was all sodium chloride and not mixed with sodium hydrogen carbonate, would you need to add a little less or a little more hydrochloric acid to the reaction?

A 10.0 gram sample of h2o at 23.0c absorbs 209 joules of heat. what is the final temperature

What does the sum of the protons and neutrons in an atom equal

Which gas sample at STP has the same total number of molecules as 2.0 liters of CO2 (g) at STP

Benzene contains only carbon and hydrogen and has a molar mass of 78.1 g/mol. Analysis shows the compound to be 7.44% hydrogen by mass. Find the empirical and molecular Formula of benzene.