Diagnostic test chapter 1 IAC

What do we mean by a pure substance in chemistry?

• a substance without polution

• a substance which has a boiling point and a melting point

• a substance with one colour

How is the phase transition from gas to liquid called?

• evaperation

• condensation

• sublimation

• solidification

The threshhold limit value expresses

• how many mg of a gas may present per m³

• how far you are from the limit

• how many m³ of gas may present per mg

• the value that should be reached to work safely

A physical quantity is

• something very physical

• a unit you can use e.g. km or kg

• a property you can measure

If you want to go from degree Kelvin to degree Celsius, you

• have to add 273 degrees

• do not have to do anything

• you have to substract 273 degrees

• you have to change the word

This hazard pictogram means

• not permitted for animals

• be aware living creatures present

• a cure against animals and plants

• environmental hazard

The density of a substance is 10,0 g/dm³.

How many g is 2,5 dm³ of this substance?

• 2,5

• 5,0

• 25,0

• 50,0

3 properties of a substance are:

• Taste, colour, melting point

• Smell, combustibility, shape

• Boiling point, solubility, mass

Which numbers are named correctly?

• 5 = burner, 7 = beaker

• 6 = gauze, 9 = tripod

• 8 = test tube rack, 9 = tripod

• 5 = burner, 9 = duo pod

15200 mL = ....L

• 1520 L

• 152 L

• 15,2 L

• 1,52 L