Which scientist offered proof that atoms exist?

a. Aristotle

b. Democritus

c. John Dalton

d. Isaac Newton

What are the 3 types of minerals?

Which statement is true about the elements fluorine, chlorine, and oxygen? A. They are all halogens. B. They react easily with metals. C. They are similar to noble gases. D. They are all nonmetals.

A certain gas is present in a 13.0 l cylinder at 4.0 atm pressure. if the pressure is increased to 8.0 atm, the volume of the gas decreases to 6.5 l.

c. Lead crystallizes in a face-centered cubic structure with a density of 11.34 g/cm3. Polonium crystallizes in a simple cubic structure with a density of 9.3 g/cm3.

10. Which statement best describes evidence that a chemical reaction occurs as a cake bakes? A The water in the cake evaporates. B The cake rises as gas bubbles form in the baking cake.

Our body solution tests at a pH of about 6.8. This pH is:

A diatomic gas has the molar mass of 38.00g/mol. what is the possible formula?

Which of the following is the final concentration of KCl if 500 ml of 0.25 M KCl is diluted to a final volume of 5 L? 0.025 L 0.0025 L 25 L 2.5 L

What do you use to measure mass

A salt shaker filled with 17.0g sodium chloride contain how many moles?