Why did Koby use the same amount of baking soda and same amount of liquid for each combination?

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

Which of the following is a physical change? a. burning a piece of wood b. sawing a piece of wood in half c. rust forming on an iron fence d. a copper roof changing color from orange to green

If a sample of radioactive isotopes takes 600 minutes to decay from 400 grams to 50 grams, what is the half-life of the isotope?