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Marysya12 [62]
3 years ago
14

Which term best describes a protein that speeds up chemical reactions in living things?

Chemistry
2 answers:
miskamm [114]3 years ago
5 0
An enzyme speeds up chemical reactions as it acts as a catalyst. 
pychu [463]3 years ago
4 0

Answer:

b. enzyme is the correct answer.

Explanation:

The chemical reactions require a catalyst termed as an enzyme to speed up the reaction in living things.

The enzyme speeds up the chemical reactions by giving another reaction pathway of reducing its activation energy.

Enzymes improve the efficiency of chemical reactions.

Enzymes decrease the activation energy of the chemical reaction which is required for a reaction to start.

Thus (b) enzyme is the correct answer.

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During an experiment, 104 grams of calcium carbonate reacted with an excess amount of hydrochloric acid. If the percent yield of
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92.4 grams.

Explanation:

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<em>CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O,</em>

1.0 mole of CaCO₃ reacts with 2.0 moles of HCl to produce 1.0 mole of CaCl₂, 1.0 mole of CO₂, and 1.0 mole of H₂O.

  • We need to calculate the no. of moles of (104 g) of CaCO₃:

<em>no. of moles of CaCO₃ = mass/molar mass</em> = (104 g)/(100.08 g/mol) = <em>1.039 mol.</em>

<u><em>Using cross multiplication:</em></u>

1.0 mole of CaCO₃ produce → 1.0 mole of CaCl₂.

∴ 1.039 mole of CaCO₃ produce → 1.039 mole of CaCl₂.

∴ The amount of CaCl₂ produced = no. of moles x molar mass = (1.039 mol)(110.98 g/mol) = 114.3 g.

∵ percent yield of the reaction = [(actual yield)/(theoretical yield)] x 100.

Percent yield of the reaction = 80.15%, theoretical yield = 115.3 g.

<em>∴ actual yield = [(percent yield of the reaction)(theoretical yield)]/100 </em>= [(80.15%)/(115.3 g)] / 100 = <em>92.42 g ≅ 92.4 g.</em>

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