Place a 400 ml beaker, half-filled with water, on a bot plate and let it reach boiling. Set the hot plate on low. Place a pinch clamp on the knot end of the balloon and place the balloon on the top of the beaker so that the pinch clamp sits inside the beaker but does not touch the water. What happens to the balloon after it has been on the beaker for 5 minutes? Explain your observation. Predict what would happen if you heated the balloon to an even higher temperature What do you think is happening on the microscopic scale (atomic level)? After heating the gas, did the density of the gas in the balloon change? Explain your answer Remove the balloon from the beaker and place it in an ice bath. Explain what happens.

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

In saturated organic compounds, all the bonds between carbon atoms are called?

The climate of the continental united states is generally 1. tropical 2. temperate 3. arctic 4. highland