Which event is endothermic?

a) the burning of a match

b) the change of water vapor to a liquid

c) the combustion of propane gas

d) the melting of ice

What is the chemical agent mixed with feces to determine if blood is present

Determine the % yield when 7.80 grams of benzene (c6h6) burns in oxygen gas to form 3.00 grams of co2 gas and water vapor.

An atom that produces nuclear energy is sometimes called a (n) a. nucleus. b. molecule. c. radioisotope. d. decay product.

Mayonnaise is made up of eggs, oil, and vinegar. Under which category it should be classified?

A 31.0-g sample of water at 290. k is mixed with 47.0 g water at 340. k. calculate the final temperature of the mixture assuming no heat loss to the surroundings.

Is a sample of liquid nitrogen more dense than a sample of nitrogen gas

You have a balloon containing 1 L of air at STP in a vacuum chamber. What will the volume of the balloon be when you reduce the pressure by half and increase the temperature to 373 K?

Which method will correctly determine whether the forces on an object are balanced or unbalanced? A. Multiply the forces in the horizontal direction by the forces in the vertical direction. B.

Carbon is found in all known forms of life. Which statement best describes why carbon is uniquely suited to forming macromolecules such as those found in living organisms? A. Carbon forms large compounds that are not chemically reactive. B.

Name a type of asteroid and give a description.