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aleksandr82 [10.1K]
3 years ago
7

Which of the following statements about enzymes is true?. a. Enzymes are able to heat up molecules so that they can react.. b. E

nzymes always provide carbon dioxide for chemical reactions.. c. Enzymes are biological catalysts which act on a substrate.. d. Enzymes absorb excess heat so that reactions occur at low temperatures.
Chemistry
2 answers:
stepladder [879]3 years ago
7 0
"<span>Enzymes are biological catalysts which act on a substrate" is the statement among the statements given in the question that is true about enzymes. The correct option among all the options that are given in the question is the third option or option "c". I hope that the answer has come to your help.</span>
taurus [48]3 years ago
5 0
The answer is C as enzymes are biological catalysts that act on a substrate such as starch if the enzyme were amylase

hope that helps 
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Answer:

5.158 mol/L

Explanation:

To find the molarity, you need to use the formula:

Molarity (M) = moles / volume (L)

You have been grams sodium carbonate. You need to (1) convert grams Na₂CO₃ to moles (via molar mass), then (2) convert moles Na₂CO₃ to moles HCl (via mole-to-mole ratio from equation), then (3) convert mL to L (by dividing by 1,000), and then (4) use the molarity equation.

<u>Steps 1 - 2:</u>

2 HCl + 1 Na₂CO₃ ----> 2 NaCl + H₂O + CO₂

6.5287 g Na₂CO₃         1 mole            2 moles HCl
--------------------------  x  -------------  x  -------------------------  =  0.12318 mole HCl
                                      106 g           1 mole Na₂CO₃

<u>Step 3:</u>

23.88 mL / 1,000 = 0.02388 L

<u>Step 4:</u>

Molarity = moles / volume

Molarity = 0.12318 mole / 0.02388 L

Molarity = 5.158 mole/L

**mole/L is equal to M**

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