Which is the correct measure of density?

mass/volume

mass x volume

weight/volume

volume/weight

Ionization changes identity of substance?

Which statement best describes the water molecules in a hydrate? They slide around the ions throughout the crystal lattice. They vibrate but are held in fixed positions in the crystal lattice.

Hydrogen reacts with oxygen to produce water. 2H2 (g) + O2 (g) → 2H20 (1) The mass of oxygen before and after the reaction A. varies with the experimental conditions B. is always the same. C. is sometimes same and sometimes different. D.

Which change in the state of matter is thermal energy released

Do most exothermic reactions have a negative or positive change in gibbs energy

What does ice cream melt on a hot day which type of thermal energy transfer does this melting represents

For which purpose do biochemists insert human genes into bacteria? to find a cure for the common cold to produce insulin for diabetics to kill resistant strains of bacteria to evolve certain species of bacteria

Cracks in rocks chemical or mechanical

A large boulder falls from an underwater ledge and crashes on the floor of the ocean. A pod of dolphins is 800 meters away. Determine how long it takes for the sound of the crash to reach the dolphins. A) 0.5 sec B) 0.3 sec C) 2.3 sec D) 1.9 sec

Given 4.80g of ammonium carbonate, find: Number of moles of the compound Number of moles of ammonium ions Number of moles of carbonate ions Number of moles of hydrogen atoms Number of hydrogen atoms