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CfE Higher Chemistry Unit 3 > Getting The Most From Reactants > Flashcards

Flashcards in Getting The Most From Reactants Deck (12)
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1

Give examples of factors influencing industrial process design?

  • availability, sustainability and cost of feedstock(s)
  • opportunities for recycling
  • energy requirements
  • marketability of by-products
  • product yield

2

Give examples of environmental factors influencing industrial process design?

  • minimising waste
  •  avoiding the use or production of toxic substances
  • designing products which will biodegrade if appropriate

3

Why are balanced equations important for reactions?

Balanced equations show the mole ratio(s) of reactants and products.

4

What is meant by the molar volume of a gas?

The molar volume is the volume occupied by one mole of a gas.

The units used for the molar volume are l mol-1 (litres per mole).

Same for all gases.

5

What effects the value of the molar volume?

Temperature and pressure

6

How would a number of moles be calculated if given a mass and gram formula mass?

n = m/GFM

7

How would number of moles calculated if given a volume and concentration?

n = c x v

8

What is meant by an excess reactant?

When one reactant is in excess, there will always be some left over. The other reactant becomes a limiting factor and controls how much of each product is produced.

9

How can the percentage yield be calculated?

% Yield = actual yield / theoretical yield x 100

10

What does a higher percentage yield show about a reaction's efficiency?

The higher the percentage yield is, the more efficient the reaction. 

11

What does a reaction's atom economy show?

The atom economy of a chemical reaction is a measure of the percentage of reactants that become useful products.

12

How can the atom economy be calculated?

% Atom economy = mass of desired product / total mass of products x 100