A weather balloon with a 2-meter diameter at ambient temperature

Jan 16th, 2015
Price: $15 USD

Question description

1. A weather balloon with a 2-meter diameter at ambient temperature holds 525 grams of helium. What type of electronic probe could be used to determine the pressure inside the balloon?

A barometric B thermometric C calorimetric D spectrophotometric

2 Which would be most appropriate for collecting data during a neutralization reaction?

A a pH probe B a statistics program C a thermometer D a graphing program

3 A scientist observed changes in the gas pressure of one mole of a gas in a sealed chamber with a fixed volume. To identify the source of the changes, the scientist should check for variations in the

 A air pressure outside the chamber. B molecular formula of the gas. C temperature of the chamber. D isotopes of the gas.

 4 Electrical fires cannot be safely put out by dousing them with water. However, fire extinguishers that spray solid carbon dioxide on the fire work very effectively. This method works because carbon dioxide

A displaces the oxygen. B renders the fire’s fuel non-flammable. C forms water vapor. D blows the fire out with strong wind currents.


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