What was the source of organic chemicals in the past?
What chemical did Wohler prepare in the laboratory?
What else can Wohler be credited with?
What do you know about petroleum?
It's written in the text: "Nowadays, however, we use the term "organic compounds" to mean carbon compounds, there being some exceptions to the rule." What are the exceptions?
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Test 9
1. Carbon is to be … along with hydrogen and oxygen as one of the most important element.
Studied
Considered
Ranked
Known
2. Graphite is a conductor of…
Electricity
Light
Heat
Exhausts
3. Carbon … only about 0.03 percent of the Earth crust.
Contains
Makes
Has
Constitutes
4. Carbon … in two crystalline forms.
Occurs
Meets
Is
Presents
5. These forms differ strikingly by their …
Sites
Properties
Structures
Masses
6. Graphite … parallel planes of atoms.
Possessed
Possess
Is possessed
Possesses
7. All atoms in a diamond are firmly … together.
Linked
Ranked
Bonded
Bound
8. The carbon chain can be practically any…
Height
Hence
Length
Light
9. Carbon dioxide vaporizes without … at 79o.
Heating
Melting
Cooling
Leading
10. Carbon … is a colourless, odourless gas with small solubility in water.