1. When someone is standing at one end of a large rooms opens a bottle of vinegar, it may take several mintues for a person at the other end to smell it. Gas molecules at room temperature move at very high velocities, so what is responsible for the delay in detection of the vinegar?
2. Standard temp. and pressure (STP) are defined as what?
3. If the solubility of NaCl at 25 degrees celcius is 36.2/100g H2O, what mass of NaCl can be dissolved in 50. g of H2O?
4. How many moles of HNO3 are needed to prepare 5.0 liters of a 2.0 M solution of NHO3?
5. The random molecular motion of a substance is greated when the substance is
A. Condensed
B. A liquid
C. Frozen
D. a gas
6. The Specific heat of copper is about 0.4 joules/gram degrees celsius. How much is needed to change the temperature of a 30-gram sample of copper from 20.0 degrees celsius to 60.0 degrees celsius?
7.When a reaction is at equilibrium and more reactant is added, which of the following changes is the immediate result?
2007-04-23 14:45:45 · 1 answers · asked by Rose S 2 in Science & Mathematics ➔ Chemistry
1. While the molecules move fast, they still take time to get across a room. Moreover, people have a threshold for noticing an odor, so the concentration where the person is has to build up to that level.
2. 0 deg C and 1 atm (101.3 kPa)
3. about half
4. 10
5. a gas
6. 480 joules
7. The reaction continues to form more product.
2007-04-23 14:58:18 · answer #1 · answered by cattbarf 7 · 0⤊ 0⤋