Explain reasons why

helium is used to fill balloon instead of hydrogen having a lighter weight

What do Coefficients in a chemical equation express

Steel is made mostly of iron and carbon, though sometimes it can contain a. tin. b. nickel. c. brass. d. cadmium.

How would a soil that develop in a warm, wet place be different than one that develop in hot, dry place

How does density differ from concentration?

Why had americans developed a tradition of waste?

Suppose that 0.95 g of water condenses on a 75.0 g block of iron that is initially at 22 °c. if the heat released during condensation is used only to warm the iron block, what is the final temperature (in °c) of the iron block?

How many grams of NaOH are produced with the reaction of 5.00 moles of water?

Describe the physical properties of water

Which element has the same number of valence electrons as oxygen--. a. Neon-b. Nitrogen-c. Sulfur-d. Fluorine

Approximately how many half-lives must pass for the amount of radioactivity in a substance to decrease to below 1% of its initial level?