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3 years ago

Why does the rate of most reactions decrease over time?

Chemistry

1 answer:

ratelena [41]3 years ago

3 0

Answer:

ExplanaA) A decrease in reactant concentration reduces the frequency of successful collisions. tion:

As a reactant gets used up, there are fewer molecules present to collide with others. A reaction depends on molecular collisions. When there are fewer collisions, the reaction slows down.

B) is wrong. A reaction is usually carried out at constant temperature,

C) is wrong. Not all reactions need catalysts.

D) is wrong. If the temperature is constant, pressure will have little effect on the movement and energy of molecule.

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The number of particles in one mole of a chemical substances is 602,200,000,000,000,000,000,000 particles. What is the correct w

crimeas [40]

The correct way to write this number in scientific notation : 6.022 x 10²³

<h3>Further explanation </h3>

Scientific Notation is a standard form of writing numbers used in mathematical operations

The rules:

1. Writing order : first digit, decimal point, next digit

2. Then followed by powers of 10 (the value can be +/-)

If the value is> 10 (the power of 10 is +), the decimal point is moved to the left, to the right of the first digit

If the value is <10 ((the power of 10 is -), the decimal point is moved to the right, to the right of the first digit

I certainly didn't count the details of the number of zeros listed, but only saw the answer choices.

And the right ones are: 6.022 x 10²³

3 0

3 years ago

Read 2 more answers

6. At a glance, it appears like the law of

Mamont248 [21]

Energy and mass equivalence

Explanation:

The law of conservation of energy does not apply to nuclear reactions, the law of conservation of mass-energy makes more sense in this regard.

In nuclear reactions mass is transformed into energy. Therefore, it does not conform with the law of conservation of energy.

According to the law of conservation of energy "energy is neither created no destroyed but they are transformed from one form to another. "
In nuclear reactions, mass is usually lost. Mass is not conserved.
But, the mass is converted into energy and we say there is mass and energy equivalence for nuclear reactions.

Learn more:

Chemical laws brainly.com/question/5896850

#learnwithBrainly

4 0

3 years ago

What is produce in all chemical reactions?

bazaltina [42]

Answer: Reactants and Products

Explanation:

The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products.

6 0

4 years ago

Which of the following are tru

Aleks04 [339]

Answer:

Explanation:

7 0

3 years ago

How many moles are in 275g (Ca(NO3)2

shepuryov [24]

Answer:

1.68 mol Ca(NO₃)₂

General Formulas and Concepts:

Atomic Structure

Reading a Periodic Table
Moles
Compounds

Stoichiometry

Using Dimensional Analysis

Explanation:

Step 1: Define

[Given] 275 g Ca(NO₃)₂

[Solve] mol Ca(NO₃)₂

Step 2: Identify Conversions

[PT] Molar Mass of Ca: 40.08 g/mol

[PT] Molar Mass of N: 14.01 g/mol

[PT] Molar Mass of O: 16.00 g/mol

Molar Mass of Ca(NO₃)₂: 40.08 + 2[14.01 + 3(16.00)] = 164.10 g/mol

Step 3: Convert

[DA] Set up: $\displaystyle 275 \ g \ Ca(NO_3)_2(\frac{1 \ mol \ Ca(NO_3)_2}{164.10 \ g \ Ca(NO_3)_2})$
[DA] Divide [Cancel out units]: $\displaystyle 1.67581 \ mol \ Ca(NO_3)_2$

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

1.67581 mol Ca(NO₃)₂ ≈ 1.68 mol Ca(NO₃)₂

4 0

3 years ago

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