What particles in an atom can increase or decrease without changing the identity of the element?

3. If you have 20.00 moles of potassium carbonate, how many grams of potassium carbonate do you have?

The elements at the bottom of the table were pulled out to keep the table from becoming too long. these are called the

What happens when a pure substance undergoes a chemical change

Who discovered chlorine

If a runner completes a 10 kilometer race in 32.50 minutes, what is the 10.0 km pace in miles per hour? (1.609 km = 1 mile approximately)

The atomic weight of hydrogen is 1.00794. a. True b. False

Describe What kind of ions do metals form? What kind of ions do nonmetals form?

A car is driven through streets treated with salt and then parked in a warm garage. a) How will the rate of rusting compare with a car that has not been driven in the streets treated with salt but left parked outside?

Amalgam is an alloy that contains mercury and other metals. Which of these atoms would most likely form metallic bonds with mercury? Check all that apply. bromine copper hydrogen iodine silver tin

Which fossil fuel is the most widely consumed in the United States? A. petroleum B. natural gas C. peat D. coal