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DIA [1.3K]
2 years ago
9

Select the correct answer. Why does every chemical reaction require a certain amount of activation energy? A. Energy is released

when the reactants begin to react. B. Energy lost to the environment during the reaction must be replaced. C. Forming the activated complex requires energy. D. The products have more potential energy than the activated complex. E. The reactants have less potential energy than the products.
Chemistry
1 answer:
horsena [70]2 years ago
5 0

Answer:

<u>The answer is</u>: <em>B. </em><em>Energy lost to the environment during the reaction must be replaced.</em>

Explanation:

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The sugar in your kitchen has a molar mass of 342.3 g/mol. How many particles are present inside a sugar bowl if there are 250 g
Anastaziya [24]

Number of particles inside a sugar bowl = 4.4 x 10²³

<h3>Further explanation</h3>

Given

The molar mass of sugar = 342.3 g/mol

mass of sugar = 250 g

Required

Number of particles

Solution

1 mol = 6.02 x 10²³ particles

mol of sugar :

\tt mol=\dfrac{mass}{molar~mass}

mol = 250 g : 342.3 g/mol = 0.73 mol

Number of particles :

N = n x No

N = 0.73 x 6.02 x 10²³

N = 4.39 x 10²³ ≈ 4.4 x 10²³

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3 years ago
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Answer:

64

Explanation:

Distance traveled in 2 hours = 2 * 40 = 80 m

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Total distance covered = 240 + 80 = 320m

Total time = 2 + 3 =5 h

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3 years ago
Dr. Winters decides not to tell the people in his experiment about the potential risks. He
anzhelika [568]

Answer: sorry I cant help you I need the same answer

Explanation:

5 0
3 years ago
There are two isotopes of an unknown element, X-19 and X-21. The abundance of X-19 is 14.55%. A weighted average uses the percen
alekssr [168]

Answer:

2.765amu is the contribution of the X-19 isotope to the weighted average

Explanation:

The average molar mass is defined as the sum of the molar mass of each isotope times its abundance. For the unknown element X that has 2 isotopes the weighted average is defined as:

X = Mass X-19 * Abundance X-19 + MassX-21 * Abundance X-21

The contribution of the X-19 isotope is its mass (19.00 amu) times its abundance (14.55% = 0.1455). That is:

19.00amu * 0.1455 =

2.765amu is the contribution of the X-19 isotope to the weighted average

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When cells or organisms maintain a stable internal state in a changing environment is called?
Goryan [66]

Answer:

Homeostasis

Explanation:

8 0
3 years ago
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