Which of the following is NOT a sign of a chemical change?

What is the name given to the process of converting nitrogen in the air into compounds that plants can use?

Which of these describes the law of conservation of mass?

What is a catalyst's role in a chemical reaction?

Which of the following is the correct term for a substance that is dissolved in a solvent?

What type of reaction involves the transfer of electrons between two chemical species?

What is the pH of a neutral solution?

Which gas is commonly produced during the reaction of an acid with a metal?

What is the name given to the minimum amount of energy needed for a chemical reaction to occur?

What is the process called when a substance absorbs heat from its surroundings?