The pressure of a weather balloon is measured at dawn. The volume of the balloon is 850 litres when the temperature is 10 degrees Celsius and has a pressure of 240 kPa. The balloon is filled to the point at which it can no longer expand. The temperature will reach 37 degrees Celsius by noon. /
A) What will be the new pressure inside of the balloon at noon (assuming its volume does not change)? Explain your answer.
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B) How many moles of helium does the weather balloon contain?
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C) The scientist decides to change the initial pressure, so the balloon is not in danger of bursting on such a hot day. Calculate the highest pressure that the balloon can begin with in the morning to avoid exceeding 252 kPa at 37 degrees Celsius. Assume a constant volume.

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

Word equation for k(s) +h2o(l) yield koh (aq) + h2

Which of the following is not one of the steps in the scientific method a. hypothesize b. summarize c. analyze d. familiarize