Make sure you have understood everything in this section (Lessons A3, A4, A5 and A6).
Use the Self-Check below, and the Self-Check & Lesson Review Tips to guide your learning.
This is also a good time to visit your Section 2 Checklist to make sure you have completed all the recommended learning activities.

Unit A Section 2 Self-Check

Instructions


Complete the following 6 steps. Don't skip steps – if you do them in order, you will confirm your understanding of this section and create a study bank for the future.

  1. DOWNLOAD the self-check quiz by clicking here .

  2. ANSWER all the questions on the downloaded quiz in the spaces provided. Think carefully before typing your answers. Review the lessons of this section if you need to. Save your quiz when you are done.

  3. COMPARE your answers with the suggested "Self-Check Quiz Answers" below. WAIT! You didn't skip step 2, did you? It's very important to carefully write out your own answers before checking the suggested answers.

  4. REVISE your quiz answers if you need to. If you answered all the questions correctly, you can skip this step. Revise means to change, fix, and add extra notes if you need to. This quiz is NOT FOR MARKS, so it is perfectly OK to correct any mistakes you made. This will make your self-check quiz an excellent study tool you can use later.

  5. SAVE your quiz to a folder on your computer, or to your Private Files. That way you will know where it is for later studying.

  6. CHECK with your teacher if you need to. If after completing all these steps you are still not sure about the questions or your answers, you should ask for more feedback from your teacher. To do this, post in the Course Questions Forum, or send your teacher an email. In either case, attach your completed quiz and ask; "Can you look at this quiz and give me some feedback please?" They will be happy to help you!

Be a Self-Check

Superhero!



Self-Check Quiz Answers

Click each of the suggested answers below, and carefully compare your answers to the suggested answers.

If you have not done the quiz yet – STOP – and go back to step 1 above. Do not look at the answers without first trying the questions.

 
Whipped cream is a homogenous mixture made of tiny particles of cream and air. The cream and air particles spread out evenly and don’t settle out. This homogenous mixture is not transparent, so it is not a solution. Therefore, whipped cream must be a colloid.
Saltwater is a solution. The particles in solutions are spread out evenly, which is why you can’t see the salt dissolved in the ocean water. In a solution, the particles are separated and small enough to fit through the holes in the coffee filter paper. Both salt and water particles in the solution will fit through the tiny holes in the coffee filter paper, and can’t be captured.

A more effective method of separating a saltwater solution is to evaporate the water, leaving salt crystals behind.
The first step would be to collect the sugar and add water to the sugar and sand mixture. The sugar will dissolve in the water, but the sand won’t. If the sugar makes a saturated solution, you can heat the solution on the camping stove to make all of the sugar dissolve.

The second step would be to pour the sugar, water, and sand through a coffee filter into a cup. The sand will stay in the coffee filter because it’s insoluble in water and the sand particles are too big to fit through the filter.

Lastly, evaporate the water from the sugar solution. You can speed up this process by heating the sugar solution in a pot on the camping stove. The sugar may recrystallize in a different form from the original sugar, but it will still be sweet!
Since water and oil are insoluble, water from the meat stays together in little drops on the pan. Those little drops of water quickly heat up and evaporate into gaseous water. The steam water particles don’t dissolve into the oil to escape gently at the oil’s surface. Instead, the steam gas bursts through the oil to reach the air, which causes oil splattering.
Ocean water is a concentrated solution of salt in water. Saline solution is a dilute solution of salt in water.