Calculate the mass number for an atom that has 45 neutrons and 35 electrons.

5H₂ 1. What number represents the coefficient? 2. What number represents the subscript? 3. What element is represented by the letter H? 4. How many total H's are there?

How many atoms are there in 6.0 moles of pure cobalt

If you mix chlorine lithium and nickel together which two elements would be the most reactive?

In a chemical reaction, substance R reacts with compound XY to produce 47.0 g of compound RX. If the theoretical yield of RX is 56.0 g, what is its percent yield?

Contrast the methods used by the Greek philosophers and John Dalton to study the atom.

What is the mass in grams of 390 mL

Around 1910, Rutherford bombarded gold foil with alpha particles. Most of the alpha particles passed straight through. To his surprise, a smaller number were deflected by 180°. This summary recounts the scientific discovery of A.

What is the density? Mass = 120 g Volume = 96 mL

A spoonful of salt is stirred into a pot of water. The salt is a

What are some catchy projects titles for the question, "What liquids cause the most tooth decay?"