What is the study of the composition of matter and the changes that matter undergoes?

A. Alchemy B. Chemistry C. Metallurgy D. Pharmacology

What does a catalyst do to the activation energy of a chemical reaction? has no effect on the activation energy reduces the activation energy lowers the activation energy submit rewatch?

Which of the following does not affect the electrical resistance of a body? A. Length of the body B. Temperature of the body C. Material composing the body D. Bodies directly surrounding the body

What is the definition of an colvalent bond? A. a bond between two negative ions B. a bond between two positive ions C. a bond between a positive and negative ion D. a bond between two atoms

Children's chewable tylenol contains 80 mg of acetaminophen per tablet. if the recommended dosage is 10 mg/kg, how many tablets are needed for a 53-lb child?

When the vapor pressure of a liquid equals the pressure on its surface the liquid will be

Which atomic particle dtermines the chemical behaviour of an atom?

If you could travel to the Sun and back, about how far would you travel? A. 1 AU B. 2 AU C. 5 AU D. 10 AU

A scientist is conducting a descriptive experiment where she is monitoring sea level along coastal towns in California. What is a major benefit of this experiment? The relationship shows cause and effect. It is repeatable.

If the sum of the mass of the reactants is 12.5 what would be the sum of the products be? And explain how you know this

Name 5 types of alloys