UPCAT - SCI - RM

• 1. In a solution the substance that does the

  dissolving is called ______.

  solvent
• 2. Water is a good solvent because ______.

  Water is a good solvent due to its

  polarity and small molecular size
• 3. A solution that cannot hold any more solute

  at room temperature would be ______.

  a saturated solution
• 4. Ethanol dissolved in water would be an

  example of ______.

  a solution between two miscible liquids
• 5. To form a supersaturated solution requires

  ______.

  reducing the amount of solute
• 6. Which one of the following is an example of

  a physical change?

  sugar dissolving in water
• 7. Which one of the following is not a physical

  change?

  boiling an egg
• 8. The chemicals after a chemical change

  ______.

  have properties different to the

  chemicals before the change.
• 9. Heptane is always composed of 84% carbon

  and 16% hydrogen by mass. What law does

  this observation illustrate?

  The Law of Definite Proportions.
• 10. Give the mass number for an atom that has

  10 protons, 10 electrons, and 11 neutrons.

  21
• 11. How much of substance W will react with 9.0

  g. of substance Z?

  18.0 g

  
• 12. The amount of substance WZ that will be

  produced from 12.0g of substance Z

  assuming that substance W is in excess is

  36.0 g
• 13. Which conditions will increase the rate of

  chemical reaction?

  increased temperature and increased

  concentration of reactants
• 14. When a lit match is touched to the wick of a

  candle, the candle begins to burn. When

  the match is removed, the candle continues

  to burn. In this reaction, the match ______.

  supplies activation energy.
• 15. Compared to a glass of ice water with ice in

  it, a glass of plain ice-cold water without ice

  on a warm day will warm up ______.

  faster
• 16. The solubility of a substance was

  determined in 300 cm3 water at different

  temperatures and the following is part of the

  graph obtained: In 150 cm3 water, how much of the

  substance will dissolve at 75 ̊ C?

  18 g

  
• 17. After studying the illustration above, one

  may conclude that ______.

  sodium chloride dissociates when

  placed in water

  
• 18. One may also conclude that ______.

  when ions are present they are

  attracted to electrodes having opposite

  electrical charges
• Jacques Charles was a French hot-air balloonist and scientist. He discovered Charles' law by studying the relationship between the volume and temperature of a gas at a constant atmospheric pressure. As the temperature of the gas in a balloon increased, its volume also increased. These increases inflated and lifted the balloon.

  
  

  In equation form, for the case of a constant

  pressure:

  V/T = constant

  
  

  19. If the volume of a gas at a certain pressure is

  halved, ______.

  its temperature is halved
• 20. Which of the following graphs shows the

  temperature-volume relationship for a gas?

  (T = temperature and V = volume)

  
• 21. Unless an object at rest is acted upon by a

  force, it stays at rest due to its ______.

  inertia
• 22. Maron rode on his bike from 9:00 am to

  10:30 am. If he drove at an average speed

  of 15kph, what was the total distance he

  covered?

  22.5 km
• 23. A woman exerts a constant horizontal force

  on a large box. As a result, the box moves

  across a horizontal floor at a constant

  velocity. The constant force by the woman

  ______.

  has the same magnitude as the total

  force which resists the motion of the box.
• 24. If the woman in question 23 suddenly stops

  applying a horizontal force to the box, then

  the box will ______.

  immediately start slowing to a stop.
• 25. The 0.20 kg block is attached to a spring which has a spring constant of 20 N/m. The block is initially stretched 0.10 meters and released at time t = 0 seconds. Complete the following statement: In order to increase the frequency of the motion, one would have to ______.

  decrease the mass of the block on the

  end of the spring
• 26. Which of the graphs shows a body moving

  at constant speed?

  
• 27. Which of the graphs shows a body moving

  at high acceleration at the beginning then

  starts to lose acceleration towards the end?

  
• 28. The acceleration in a body is due to unbalanced force
• 29. Two students are posed to dive off equal-height diving towers to a swimming pool below. Student B is twice as massive as student A. Which of the following is true?

  Student B did twice as much work climbing the tower
• 30. Which of the following cases is/are NOT a uniformly accelerated motion?

  A ball rolls along a frictionless plane at uniform speed.