Which statement is true about energy transfer? A. Warm water is denser than cold water.

B. Energy is created each time it is transferred.

C. Molecules move faster in warmer substances.

D. Radiation requires a medium to transfer energy.

How is the atomic number of a nucleus changed by alpha decay

If 3 moles of a compound use 24 j of energy in a reaction, what is the a hreaction in j/mol?

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?