Summary: It''s All About Chemistry
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1 Chemistry is everywhere
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What is a substance?
That is everything that has a certain mass. -
Why are properties of substance important?
If you want to use a material or asubstance for aspecific purpose. You consider the substance properties and if you want to produce a new material or substance, you have to define the properties first which is needed for this substance. -
Properties of substance defining sugare are?
It is a white solid,, easily soluble in water and sweet tasting -
What are constants of substance?
When you can expressproperties ofsubstance by a number, followed by a unit.
Example: Water for instance has amelting point of 0°C and a boiling point of 100°C -
Why are the mass and volume of a substance not properties of a substance?
Because it does not solely depend on the substance, but also on the amount of substance you have at your disposal. -
What are physical quantities?
Properties which you can measure, like mass and volumes. -
What is a unit?
The unit is the size with which you can measure a quantity.
kilogram --> mass
Litre --> Volume -
1.2 Safety
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What is kind of information can be found on a material safety data sheet?
- Physical
properties ofsubstances - Data on
toxicity flammability - how you can prevent accidents when working with a substance
- What to do in case of emergency
- Data about Treshold Limit Value
- Physical
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With what does H-phrases deal with?
Health hazards -
With what does P-phrases deal with?
Prevention, avoiding accidents
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