Make sure you have understood everything in this section (Lessons A7, A8, A9, and A10).
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 3 Checklist to make sure you have completed all the recommended learning activities.

Unit A Section 3 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.

 
Bitumen is a very viscous substance, which means it does not flow very quickly. Dissolving bitumen in other liquids makes it less viscous and able to flow through pipelines more quickly.
Object 1 has a higher density than Object 2 because it displaces a smaller volume of water. A mass in a smaller volume has a larger density.
Density is equal to mass divided by volume. Liquid 1 has a mass of 10 g in a volume of 2.0 mL, which equals a density of 5.0 g/mL. Liquid 2 has a mass of 50 g in a volume of 25 mL, which equals a density of 2.0 g/mL.

Liquid 2 has the smaller density, so it will float on top of Liquid 1.
The objects in order from lowest density to highest density are 2, 1, and 3.   Object 2 floated in both fresh and salt water, so it was less dense than both fluids. Object 1 floated in saltwater but not fresh water. Therefore, Object 1 was less dense than saltwater but more dense than fresh water. Object 3 did not float at all, so it was more dense than both fresh and saltwater.
Covering the opening of the garden hose decreases its area. As a result, the water pressure increases and it sprays further.