Ch. 1.6

Question 1

What are the three basic practical skills?

Answer 1

Transferring solutions, mixing solutions and heating.

Question 2

How do we transfer a large amount of solution?

Answer 2

Pouring it out directly.

Question 3

How do we transfer a small amount of solution?

Answer 3

Using a dropper.

Question 4

What is an advantage of using a dropper?

Answer 4

It helps us control the amount of solution to transfer more easily.

Question 5

How to use a dropper

1. Gently squeeze the ___________ _______ of a dropper and don’t release it.
2. Lower the _______ of the dropper into the solution.
3. Release the bulb to ________ some solution.
4. Remove any ____________ droplets from the tip of the dropper.
5. Place the dropper at ________________ of an empty test tube.
6. Gently squeeze the bulb to add the solution drop by drop to the empty test tube.

Answer 5

Rubber bulb, tip, draw, excess, the mouth

Question 6

Why shouldn’t we hold the dropper upside down?

Answer 6

The solution will go into the rubber bulb and it may be contaminated by any substance left there.

Question 7

We can use a dropper to transfer ___ _________ __________ of solution in the laboratory.

Answer 7

A small amount

Question 8

Four ways to mix a solution:
1. 
2.
3.
4.

Answer 8

1. Use a glass rod to stir the mixed solution
2. Gently shake the test tube
3. Tap the bottom of the test tub with the index finger
4. Stopper the test tube and shake well

Question 9

Four types of solutions:
1.
2.
3.
4.

Answer 9

1. Clear solution
2. Cloudy solution
3. Solids formed
4. Bubbles formed

Question 10

What do we use for heating in the laboratory?

Answer 10

A Bunsen burner.

Question 11

What is the use of the chimney in a Bunsen burner?

Answer 11

To direct air and gas to the flame.

Question 12

What is the use of an air hole in a Bunsen burner?

Answer 12

To let air in.

Question 13

What is the use of the collar in a Bunsen burner?

Answer 13

To control the size of the air hole.

Question 14

What is the use of the base in a Bunsen burner?

Answer 14

To hold the chimney upright.

Question 15

What is the use of the rubber tubing in a Bunsen burner?

Answer 15

To connect the Bunsen burner to the gas tap.

Question 16

How to light a Bunsen burner

1. Put the Bunsen burner on a _________________
2. Connect the rubber tubing to the ____________, make sure the connection is right
3. _________ the air hole
4. Place a ______________ just above the top of the chimney
5. Press the button of the _____________ and turn on the gas tap
6. ____________ the air hole slowly

Answer 16

Heat-proof mat, gas tap, close, gas lighter X2, open

Question 17

Sometimes, a ________________may occur if the air hole is fully ________ when ____________ a Bunsen burner.

Answer 17

Strike back, open, lighting

Question 18

What does a strike back look like?

Hint: there are two points

Answer 18

Green flame

Hissing sound

Question 19

What are the characteristics of a flame with the air hole of the Bunsen burner closed?
Name:
Sound:
Colour:
Shape:
Temperature

Answer 19

Name: luminous flame 
Sound: quiet
Colour: yellow
Shape: irregular
Temperature: lower temperature

Question 20

What are the characteristics of a flame with the air hole of the Bunsen burner opened?
Name:
Sound:
Colour:
Shape:
Temperature:

Answer 20

Name: non-luminous flame
Sound: noisy
Colours: blue
Shape: regular
Temperature: higher temperature