Procedure 1.Measure approximately 10 mL of distilled water in the 50 mL graduated cylinder. Record exact volume. 2.Place 18-20 popcorn kernels in the graduated cylinder with the water. Tap the cylinder to force any air bubbles off the kernels. Record the new volume. 3.Remove the kernels from the graduated cylinder and dry them. 4.Use the graduated cylinder next to the vegetable oil to measure 1.0 – 1.5 mL. Pour oil into 400-mL beaker. 5.Place the dry kernels the beaker with the oil. 6.Measure the total mass of the beaker, oil, and the kernels. Record this mass. 7.Turn on the hot plate to medium high setting. 8.Place the beaker on the hot plate. Place wire gauze on top of the beaker. 9.Observe the changes in the kernels and oil while heating, then turn off the hot plate when the popcorn has popped and before any burning occurs. 10.Using the beaker tongs, remove the beaker from the hot plate and allow it to cool completely. 11.Record the final mass of the beaker, oil, and the popcorn once cooling is complete.

Achemical reaction (also known as a chemical change) produces substances that are chemically different from the starting materials. an example of a chemical reaction is the formation of water from hydrogen and oxygen gas. in a physical change, a substance changes its physical appearance but not its chemical identity. an example of physical change is the formation of liquid water from solid water, a familiar process called melting. physically, liquid water looks very different from solid water (ice) but the chemical identity, water, is the same for both. which of following changes that affect the composition of our atmosphere involve physical changes and which involve chemical reactions? oxygen gas changes to ozone during thunderstorms carbon dioxide is produced by the combustion of gasoline in an automobile engine. when coal, oil, and natural gas are decomposed in landsills they produce methane gas. freezing rain develops when a warm air mass overrides a cold air mass. fog forms from water vapor when the temperature drops below the dew point

Select the correct answer. when carbon dioxide dissolves in water, it sometimes reacts with water to form carbonic acid as in this balanced equation: co2 + h2o → h2co3. if 495 milliliters of carbon dioxide at 25°c and 101.3 kilopascals reacts with excess water, what is the theoretical yield of carbonic acid? use the periodic table and the ideal gas resource a. 0.889 g b. 1.10g c. 1.27g d. 2.02g what's the answer! quick!

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