Which of the following statements are true? Select all that apply.
- A barometer measures atmospheric pressure.
- A barometer measures the pressure of a gas in a sealed container.
- We breathe in oxygen, which becomes dissolved in our blood to be delivered to cells.
- 1 mole of any gas is equal in volume to 1 mole of any other gas.
Which statement correctly describes radioactive decay of uranium-238 by alpha particle emission? Select all that apply.
- Emits a helium atom with a charge of +2.
- Converts the atom to thorium.
Water has a high specific heat (heat capacity). This property means that:
- The melting point of water (ice) is higher than that of most metals.
- Heat energy is absorbed by water at a slower rate.
- Ten grams of water at any given temperature will contain more heat energy than ten grams of a second substance with a lower specific heat at that same temperature.
- The boiling point of water is very high.
A friend is skiing at the advanced slope of the Arapahoe Basin in Colorado. When he is standing at the top of the mountain, he has potential and kinetic energy.
Which of the following statements accurately describe N2?
- It exists naturally as 2 atoms of nitrogen sharing 3 pairs of electrons.
- It always makes 2 covalent bonds with other elements.
The activation energy of a reaction (Eact):
- Increases when a catalyst is added.
- Decreases as temperature increases.