Greening Quiz

In a chemical process, what is the predicted yield?

• The mass of reactant you will need to use

• The mass of product you will get

• The maximum mass of product possible

What does it mean if you get 0% yield?

• No product has been made

• All the reactants have been used

• No product has been lost

The formula to calculate % yield is:

% yield = ​ (a)   yield)​ (b)   ​ (c)   yield) ​ (d)  

​

• (actual
• ÷
• (predicted
• × 100%
• /100%
• ×
• (nothing)
• +
• -

In a reaction, the actual yield is 20 g and the predicted yield is 50 g.

Percentage yield = ........ %

A 'green' chemical process should:

• Have a high atom economy

• Have a low atom economy

• Lose product by filtration

Which reaction has an atom economy of 100%?

(More correct answers are allowed!)

• C + H₂O → CO₂ + 2H₂

• Cu + 2HCl → CuCl₂ + H₂

• 2Cu + O₂ → 2CuO

• Neither of them

Calculate the atom economy for making hydrogen: C + H₂O → CO + H₂

• 7.1%

• 93.3%

• 6.7%

Calculate the atom economy for making hydrogen: CH₄ + H₂O → CO + 3H₂

• 6.7%

• 20%

• 16.7%

• neither of them