28.0 grams of sodium are how many moles?

Something breaking is an example of what kind of change? A. physical only B. chemical only C. physical and chemical

How many moles are in 3.60 x 10^25 molecules of water?

What causes the lines to look bent when viewed through the glass of water?

Hat happens when an atom gains an electron? a. it becomes a negative ion. b. it has an increase in the number of protons. c. it becomes a positive ion. d. it has an increase in the number of neutrons.

In the reaction H2 + N2 2 NH3, what coefficient should be placed in front of H2 to balance the reaction

Which process uses a volume of solution of known concentration to determine the concentration of another solution? (1) distillation (3) transmutation (2) substitution (4) titration

How could weathering by release of pressure affect the amount of weathering by freezing and thawing?

What are the major water reservoirs of the world?

Name four elements that have properties similar to chlorine

What are three signs that a chemical change has taken place