Which of the following is a physical change?

explosion

rotting of food

evaporation

rusting of iron

Why is Cl2 + KI → KCl + 12 not a synthesis reaction? A) Oxygen is not a product in this reaction. B) The reaction has more than one product. C) Oxygen is not a reactant in this reaction. D) The reaction has more than one reactant.

You drink out of a drinking fountain for a full minute. How many moles of water did you just drink? (You need to know how much water comes out per second)

Who are the characters for the movie Biker Boyz

What is the heat of combustion for this sample?

What are two conclusions that Mendal made about his research on genetics

Planck's constant is approximately equal to which of the following? The product of the uncertainties in electron position and electron momentum. The sum of the uncertainties in electron position and electron momentum.

Which is the MOST accurate description about how the different types of feedback mechanisms work

Which of the following equations violates the law of conservation of mass? A) 2Al + 6HCl yields 2AlCl3 + 3H2 B) Na2C2O4 + Pb (NO3) 2 yields PbC2O4 + 2NaNO3 C) AgNO3 + LiCl yields AgCl + LiNO3 D) 3Ca + 2Cr (NO3) 3 yields 3Ca (NO3) 3 + 2Cr

Which of the following is a true statement about energy? a. energy can be created and destroyed. b. energy is never created nor destroyed. c. energy is easily created, but cannot be destroyed. d. energy cannot be converted from one form to another.

What does a reaction rate tell you