Kernels of corn are heated and become popcorn. Why is this a chemical change?

A) The size and color of the corn have changed

B) The kernels change due to their reaction of heat

C) The volume of the kernels expand

D) The mass of the kernels increase

An original sample of the radioisotope fluorine-21 had a mass of 80.0 milligrams. Only 20.0 milligrams of this original sample remain unchanged after 8.32 seconds. What is the half-life of fluorine-21? (1) 1.04 s (3) 4.16 s (2) 2.08 s (4) 8.32 s

An example of something that stores chemical energy is

A community needs more electrical energy. The community is located in an area with the following characteristics: • Average wind speed of 5 to 10 mph • One small river with slow currents • Dry, sunny conditions most of the year • No coal or oil

Create a top 10 list on the why they should teach science

Heating galactose, a monosaccharide sugar, in the presence of excess oxygen produces carbon dioxide gas and water vapor. Classify this reaction. C6H1206 (s) + 602 (9) - 6C02 (0) + 6H20 (9)

A balloon contains 1.00 mol helium gas at STP. What will the volume of the balloon be if the pressure increases to 2.00 atm?

If 100 mL of a gas were enclosed in a buret at 500 mm Hg, what volume would the gas occupy at 1000 mm Hg at the same temperature? P1V1=P2V2

Would Mn (HPO4) 2 be manganese (II) monohydrogen phosphate?

The fundamental frequency of a violin string is 440 hz. the frequency of its second harmonic is

How much of a 15.0M stock solution do you need to prepare 250ml of a 2.35ml hf solution?