S1NTC1: Lab Measurements and Procedures

Which of the following should not be done when in a laboratory?

• Wear safety glasses

• Wash hands after experiment

• Smell chemicals directly

• Inform teachers if things break immediately

When measuring length, our eyes should be directly ​ (a)   the marking.
We ​ (b)   read at an angle to ensure there is no error.

To find length, use ​ (c)   to minus ​ (d)   ​

• above
• below
• should
• should not
• bigger number
• smaller number

What are the steps to light a bunsen burner?

• Turn on gas tap

• Light bunsen burner with lighter (yellow flame observed)

• Close air hole

• Connect rubber tubing to bunsen burner

• Open air hole (blue flame observed)

Organize these options into Blue or Yellow flame

Groups:

(a) Non-luminous flame (Blue)

,

(b) Luminous flame (Yellow)

• Steady flame

• Less hot

• Visible blue color

• Happens when enough air is mixed with gas stream

• Happens when less air is mixed with air stream

• Visible yellow color

• hotter

• Flickers

• Smaller in size

• Larger in size

Which of the following is not a Hazard sign?

• Corrosive

• Flammable

• Irritant

• Toxic to environment

• Non Waterproof

Match the following physical quality to its measuring instrument

• Length

• Laboratory Thermometer

• Temperature

• Digital stopwatch

• Volume

• Ruler/
  Measuring tape

• Time interval

• Measuring cylinder

• Mass

• Electronic balance

Why do we need to use estimation in our daily life?

• we may not have a measuring device wherever we go

• we think it is better to estimate

• we are lazy

• Length changes at different places

Labels the parts of a stopwatch.

a

b

c

Seconds (s)

Milliseconds (ms)

Minutes (min)