Explain how you can tell when a change is a chemical change.

How many moles are im 8.31x1023 molecules of h2so4

What is the mass, in grams, of one mole of any substance known as?

In preparing soap you dissolved 12.5 grams of sodium hydroxide in 32 ML of de-ionized water. The product was a solid cake of soap. What happened to the water you added when preparing your soap?

The enzyme urease catalyzes this reaction. If urease is added to a solution that contains ammonia and other nitrogen-containing compounds (but no urea), will the urease catalyze any reactions? E

What is the gram-formula mass of (NH4) 3PO4? (1) 112g/mol (2) 121g/mol (3) 149g/mol (4) 242g/mol

How many moles of lithium are in 83 grams of lithium?

Ocean constitutes most of ___ of water a) Evaporation b) Precipitation c) Condensation d) Transpiration e) Sublimation Don't choose a random letter.

In the reaction, Zn + HCl-> ZnCl2 + H2, 25 grams Zn are reacted with 17.5 grams HCl. How many grams of H2 will be produced? A. 0.382 g of H2 B. 0.479 g of H2 C. 0.7865 g of H2 D. 0.484 g of H2

Is nail varnish soluble?

What is the periodic trend for atomic size from top and bottom in a group? From left to right in a period?