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3 years ago

Which statement best describes the function of enzymes?

Chemistry

2 answers:

sveta [45]3 years ago

4 0

Enzymes reduce the activation energies of biological reactions.

Delvig [45]3 years ago

4 0

<h2>Answer:</h2>

<u>The correct option is </u><u>D. Enzymes reduce the activation energies of biological reactions.</u>

<h2>Explanation:</h2>

Enzymes are proteins that speed up the rate of a chemical reaction without being used up during the reaction. They are biological catalysts. Catalysts, as we know lower the activation energy for reactions and speed them up. The lower the activation energy for a reaction, the faster the rate. Thus enzymes speed up reactions by lowering activation energy which is option D.

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The chemical equation below shows the formation of aluminum oxide (Al2O3) from aluminum (Al) and oxygen (O2).

Rufina [12.5K]

Answer:

Mass = 182.4 g

Explanation:

Given data:

Number of moles of Al₂O₃ = 3.80 mol

Mass of oxygen required = ?

Solution:

Chemical equation:

4Al + 3O₂ → 2Al₂O₃

Now we will compare the moles of aluminum oxide and oxygen.

Al₂O₃ : O₂

2 : 3

3.80 : 3/2×3.80 = 5.7

Mass of oxygen:

Mass = number of moles × molar mass

Mass = 5.7 mol × 32 g/mol

Mass = 182.4 g

4 0

3 years ago

By paying low wages, factory owners were able to

sweet [91]

To make more profit and make their business/company’s lager this also means that the customers that buy products have more variety of choices

5 0

4 years ago

10 POINTS

Snowcat [4.5K]

E=hc/λ =6.626×10^-34×3 ×10^8 / 3×10^7 × 10^-9 = 6.626×10 ^-24J.

7 0

3 years ago

If the ozone layer gets significantly thinner in your lifetime, what changes do you need to make in your lifestyle?

Ainat [17]

Apply sunscreen with a high SPF to protect your skin from UV (ultraviolet) rays

7 0

3 years ago

How many moles are in 5.72 grams of iron (II) chloride

densk [106]

Answer:

0.0451 mol FeCl₂

General Formulas and Concepts:

<u>Chemistry - Atomic Structure</u>

Reading a Periodic Table
Using Dimensional Analysis

Explanation:

<u>Step 1: Define</u>

5.72 g FeCl₂

<u>Step 2: Identify Conversions</u>

Molar Mass of Fe - 55.85 g/mol

Molar Mass of Cl - 35.45 g/mol

Molar Mass of FeCl₂ - 55.85 + 2(35.45) = 126.75 g/mol

<u>Step 3: Convert</u>

<u /> $5.72 \ g \ FeCl_2(\frac{1 \ mol \ FeCl_2 }{126.75 \ g \ FeCl_2} )$ = 0.045128 mol FeCl₂

<u>Step 4: Check</u>

<em>We are given 3 sig figs. Follow sig fig rules and round.</em>

0.045128 mol FeCl₂ ≈ 0.0451 mol FeCl₂

8 0

3 years ago