Practice 1.1
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Question 1 of 5
1. Question
1 point(s)When smoke particles are observed with a microscope they are seen to move around randomly. This is called Brownian motion.
What causes Brownian motion?CorrectIncorrect -
Question 2 of 5
2. Question
1 point(s)Oxygen and fluorine are gaseous elements next to each other in the Periodic Table.
Under the same conditions of temperature and pressure, oxygen diffuses ……1…… than fluorine
because its ……2…… is less than that of fluorine.Which words correctly complete gaps 1 and 2?
CorrectIncorrect -
Question 3 of 5
3. Question
1 point(s)Hydrogen chloride gas, HCl, reacts with ammonia gas, NH3, to form solid ammonium chloride. The apparatus is set up as shown. After a few minutes, solid ammonium chloride forms where the two gases meet.
The experiment is repeated using hydrogen bromide, HBr, in place of hydrogen chloride. How far along the tube does the solid ammonium bromide form?
CorrectIncorrect -
Question 4 of 5
4. Question
1 point(s)Substance L melts at –7 °C and is a brown liquid at room temperature. Which temperature can be the boiling point of pure L?
CorrectIncorrect -
Question 5 of 5
5. Question
1 point(s)- When iodine is heated it turns from a solid to a gas.
- When liquid ammonia is cooled it turns into a solid.
- When ice is heated it turns into water.
Which terms describe these changes of state?
When iodine is heated When liquid ammonia is cooled When ice is heated A boiling freezing melting B freezing sublimation boiling C sublimation condensation freezing D sublimation freezing melting CorrectIncorrect