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Flashcards in organic chemistry Deck (21)
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1
Q

State two other general features of an homologous series of compounds.

A

chemically similar or chemically the same or react in the same way same functional group same general formula

2
Q

Name the process which is used to obtain the fractions from petroleum

A

fractional distillation

3
Q

State what is meant by the term saturated, as applied to hydrocarbons.

A

contains only single bonds

4
Q

State what is meant by the term molecular formula.

A

the molecular formula gives the actual number of atoms of each element/type in a molecule

5
Q

Identify a catalyst used in a catalytic converter.

A

Platinum or palladium or rhodium

6
Q

Explain what is meant by the term structural isomers

A

compounds with the same molecular formula but different structural formulae

7
Q

Explain what is meant by the term fraction as applied to fractional distillation.

A

compounds with similar boiling point

8
Q

State a property of the molecules in petroleum which allows the mixture to be separated into fractions.

A

molecules have different boiling points

9
Q

Describe the temperature gradient in the column.

A

molecules have different boiling points

10
Q

State one economic reason for the cracking of petroleum fractions.

A

production of alkene

11
Q

Crude oil is separated into fractions by fractional distillation. Outline how different fractions are obtained by this process.

A

Crude oil is heated to vaporise it (1) (Vapour passed into fractionating) tower / column (1) Top of tower cooler than bottom or negative temperature gradient (1) fractions separated by b.p OR condensed at different temperatures OR levels OR low boiling fractions at the top OR at the top small molecules or light components (1)

12
Q

Name 4 conditions for fermentation

A
  1. yeast catalyst 2. anearobic 3. 35 degrees temp 4. 1 atm pressure
13
Q

State the meaning of the term catalyst.

A

speeds up the rate of reaction AND is chemically unchanged at the end

14
Q

What is hydration?

A

addition of water to a molecule

15
Q

What is the reaction between water and barium

A

Ba + 2H2O——–> Ba(OH)2 +H2

16
Q

State the trend in reactivity with water of the Group 2 metals from Mg to Ba

A

increases

17
Q

Give the formula of the least soluble hydroxide of the Group 2 metals from Mg to Ba

A

Mg(OH)2

18
Q

State how barium sulfate is used in medicine. Explain why this use is possible, given that solutions containing barium ions are poisonous.

A

Barium meal. barium sulfate is insoluble

19
Q

Give one reason why 2,3,3,3-tetrafluoropropene is a more environmentally acceptable refrigerant than chlorodifluoromethane

A
  1. chlorodifluoromethane does contain chlorine 2. C–F is too strong and does not create radicals
20
Q

State the meaning of the term stereoisomers.

A

molecules the same structural formula but with atoms arranged differently in space

21
Q

What is the

A