science

• It states that gases are composed of molecules and are always in constant random motion.

  Kinetic Molecular Theory
• Gas pressure is caused by

  Gas molecules heating up
• The temperature at which average kinetic energy of gas particles theoretically is zero is called

  absolute zero
• Which value represents the standard temperature?

  273 K
• As the volume of confined gas decreases at constant temperature, the pressure exerted by the gas


  Increases
• Which Gas Law is involved when a balloon pops after being sat on?


  Boyle’s Law
• A balloon is infiated to a volume of 130 ml at a pressure of 690 mmHg.

  If the pressure is increased to 1000 mmg, what will the new volume

  89.7 ml
• Charles Law states that

  when the pressure of a gas is constant, its volume is directly proportional to its temperature.
• What is most likely to happen when an aerosol can is heated?

  the can will eventually explode
• Which of the following situations best illustrates Charles' Law expansion of the balloon as it is being submerged in hot water
• Records show that the incident of tire explosion is high during summer season. Which of the following gives the best explanation for this observation?

  high temperature during summer season causes the air inside the tire to expand
• Which of the following are situations is not an example of Avo gadro s

  Law?

  A flat tire takes up less space than an infeted tire, because it contains less air.
• In using a tire pump, the handle is easily pressed down on the first few pumps. But as you proceed with the pumping, you will notice that the handle becomes increasingly harder to press down. Which gas law explains this phenomenon?


  Boyle’s Law
• If 23.1 mol of oxygen gas occupies a volume of 5.0 L at a particular temperature and pressure, what volume will 2.50 mol of oxygen gas occupy under the same conditions?

  0.541 L
• A chemical reaction is a process in which

  1. All reactants change state
  2. products change into reactants
  3. the law of conversation of mass applies
• During a chemical reaction, atoms are rearranged
• In a chemical reaction, 300 grams of reactant A are combined with 100 grams of reactant B. Both A and B react to completion. How much will the product weigh?

  400 g
• Which of the following groups are classified as polysaccharide?

  Starch, cellulose, glycogen
• Energy production - major function of carbohydrates
• a double-displacement reaction


  Cd(NO3)2 + Na25 → CdS + 2 NaNO;
• Combination reactions always


  form only one product
• Not all Gas Law problems have Kelvin (K) as the unit of temperature.

  They can be expressed in Celsius (*C) and Fahrenheit(*F). So convert 123°C 10 K

  396 K
• The equation for Combined Gas Law 


  p1v1/t1 = p2v2/t2
• As gas molecules collide, which will happen?

  they will not stick together
• How does the concentration of the reactants affect the reaction rate?

  Reaction rate increases with increase in concentration.
• Which of the following will NOT increase the rate of reaction?


  Maintaining constant temperature of the reaction mixture
• Fresh fish and meat that are not stored in a refrigerator show signs of spoilage in less than a day, what has caused this spoilage?

  oxygen in air
• Reactions eventually stop. What is generally the reason for this?

  The catalyst has been used up
• Which of the following is NOT an example of chemical change?


  cutting of paper
• If the formula for methanol is CH3OH, what would be the balanced chemical equation for this reaction?


  C + H + 0 —> Ch3Oh
• An equation is balanced by


  changing subscript and coefficient
• The reaction between an acid solution and a base solution could be presented by

  acid + base —> salt and water
• Which of the following samples is highly compressible at high pressure and expandable at high temperature?

  oxygen gas
• What will happen to the temperature of the confined gas as the pressure increases?

  the gas temperature increases
• Which is most likely to happen when a coned vessel filled with gas shaken for 2 minutes?

  the temperature and pressure inside the vessels increases
• Last summer vacation, the Cruz family decided to go to Pagudpos Ilocos Norte to have a beach party. On their way to llocos, all of them were surprised when the tire suddenly exploded. What is the probable explanation for the blown-out tire during a long summer drive?


  The volume of gases increases as the temperature increases causing a blown up
• Which of the following terms is used to describe the average kinetic energy of the molecules in a sample?

  Manometer
• What do you expect to happen to the volume of a gas of its pressure is doubled and its temperature is reduced to half?

  The volume is decreased
• In which of the following sets of conditions would a gas most act as a real gas?

  Low temperature and low pressure
• The law states that pressure and volume of gas are inversely proportional to each other, but are both directly proportional to the temperature of that gas


  Boyle’s Law