chemistry revision test 1

• A

• B

• C

• D

Why was a white ring observed in the position shown in the diagram?

• ammonia molecules are heavier than hydrogen chloride molecules

• hydrogen chloride molecules diffuse faster than ammonia molecules

• ammonia molecules diffuse faster than hydrogen chloride molecules

• hydrogen chloride molecules possess more kinetic energy than ammonia molecules

which of the following BEST describes what happens during osmosis?

• molecules move from a dilute solution to more concentrated solution through a partially permeable membrane

• water molecules diffuse from a dilute solution to a concentrated solution

• water molecules move through a partially permeable membrane from a dilute solution to a more concentrated solution

• water molecules diffuse from a concentrated solution to a dilute solution through a partially permeable membrane

A strip of potato is placed in a beaker of water. After 30 minutes, what changes would you observe in the strip?

• increased in length and became rigid

• increased in length and became soft

• decreased in length and became rigid

• decreased in length and became soft

• moved up

• moved down

• remained in the same position

• moved up for a while and then moved down

which of the following statements explain why salt (NaCl) can be used to preserve meat?

• it draws water out of the cells of meat by osmosis

• it is toxic to bacteria and fungi

• it inhibits the growth of microorganisms by causing water to enter into their cells

complete the following sentence. In a gas, the particles

• have small spaces between them

• possess very little kinetic energy

• vibrate in their fixed positions

• have weak forces of attraction between the particles

compared to the particles in liquids, the particles in solids

• have more space between them

• have less kinetic energy

• move faster

• have weaker forces of attraction between them

• i

• ii

• iii

• iv

At room temperature, which substance will be composed of slow moving particles?

• i

• ii

• iii

• iv