Which statement is true about energy changes?

A. Energy can be created but not destroyed.

B. Energy can be created and destroyed.

C. Energy can be destroyed but not created.

D. Energy cannot be created or destroyed.

The density of ethanol is 0.789 g/cm3 at 20°C. What volume of ethanol has a mass of 15.5 grams?

Which form of opera was performed without elaborate costumes, scenery, or acting?

Explain the principle behind a cool roof

Why are carbon and nitrogen essential for survival to all living organisms? A. They supply the energy needed for living processes. B. They are needed to release the energy stored in food. C.

What is the pH of a solution obtained by dissolving two extra-strength aspirin tablets, containing 470 mg of acetylsalicylic acid each, in 240 mL of water?

What is the octet rule and how does it explain the formation of ionic compounds?

Can somebody explain step by step how to solve decomposition reactions?

Which of the following statements are correct about the chemical reaction? H2 + O2 - > H2O2 versus 2 H2 + O2 - > 2 H2O? They are both balanced chemical equations. The two reactions are equivalent. The laws of thermodynamics apply to both.

What do chemists use to describe a chemical reaction

When you drop a sugar cube in a glass of water, at first the water doesn't taste sweet. Later, it tastes very sweet. Eventually, the water will taste equally sweet throughout. What term explains molecule movement to maintain a balance?