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2 years ago

What happens to a glass of water as the average molecular kinetic energy of the water molecules increases?

Chemistry

2 answers:

Tresset [83]2 years ago

7 0

Answer: The water becomes warmer.

Explanation:

Average kinetic energy is defined as the average of the kinetic energies of all the particles present in a system. The molecules start moving more randomly. It is determined by the equation:

$K=\frac{3RT}{2}$

From above, it is visible that kinetic energy is directly related to the temperature of the system. So, if the average molecular kinetic energy increases, the temperature of the water must have increased and thus the water will become warmer.

trasher [3.6K]2 years ago

4 0

"The water becomes warmer."
Remember: Kinetic energy means how much, on average, a molecule is moving around. This is directly translated into heat. Therefore, the higher the kinetic energy, the more heat produced.

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A certain first-order reaction (A→products) has a rate constant of 7.20×10−3 s−1 at 45 ∘C. How many minutes does it take for the

lesya692 [45]

Answer:

6,41 min

Explanation:

For the reaction:

A → products

kinetics first-order reaction law is:

ln[A] = ln[A]₀ -kt

Where [A] is concentration of reactant, [A]₀ is initital concentration of reactant, k is rate constant and t is time.

If the concentration of A is 6,25% you can assume:

[A] = 6,25; [A]₀= 100. Replacing:

ln(6,25) = ln(100) -7,20×10⁻³s⁻¹t

-2,7726 = -7,20×10⁻³s⁻¹t

385s = t

In minutes:

385s× $\frac{1min}{60s}$ = 6,41 min

I hope it helps!

6 0

2 years ago

Which of the following are always larger than the neutral atoms from which they are formed?

frosja888 [35]

A. positive ions : Positive ions are formed when a neutral atom loses electrons. When neutral atoms lose electrons, the ions formed are always smaller than the neutral atoms.

B. negative ions : Yes. When the neutral atoms gain electrons to form negative ions, they always become larger, because the addition of one electron increases the electrostatic repulsion of the outermost electrons, forcing them to drift apart.

C. cations No. Cation is the same that positive ion.

D. none of the above

4 0

2 years ago

Read 2 more answers

List the numbers of protons, neutrons, and electrons in Chlorine-18. (3 points)

Mama L [17]

The electronic configuration of Chlorine is 1s2 2s2 2p6 3s2 3p5.

There are three energy levels in chlorine

First energy level is n=1 has 1s2 so total 2 electrons

Second energy level is n=2, 2s2 2p6 so total 2+6= 8 electrons

Third has 3s2 3p5 electrons just 7 total... p can contain 6 electrons but only 5 are present. So the third level has lesser number of electrons than that can be filled

8 0

2 years ago

1.5 atm is the same pressure as... (1 atm 760 mmHg)

Darina [25.2K]

<h3>Answer:</h3>

1100 mmHg

<h3>General Formulas and Concepts:</h3>

Math

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Chemistry

Gas Laws

Pressure

Stoichiometry

Using Dimensional Analysis

<h3>Explanation:</h3>

Step 1: Define

[Given] 1.5 atm

[Solve] mmHg

Step 2: Identify Conversions

1 atm = 760 mmHg

Step 3: Convert

[DA] Set up: $\displaystyle 1.5 \ atm(\frac{760 \ mmHg}{1 \ atm})$
[DA] Multiply/Divide [Cancel out units]: $\displaystyle 1140 \ mmHg$

Step 4: Check

Follow sig fig rules and round. We are given 2 sig figs.

1140 mmHg ≈ 1100 mmHg

3 0

2 years ago

What volume (in L) of H2 would be collected at 22.0oC and a pressure of 713 torr if 2.65 g of zinc react according to the equati

ASHA 777 [7]

Answer: 83.74L

Explanation:

Temp. = 295K

P = 713torr = 0.938atm

Mass = 2.65g

PV = nRT

V = nRT/PV

n = Mass/Molar mass

Molar mass of Hydrogen gas = 1.00784*2= 2.0156g/mok

n = 2.65/2.0156 = 1.31469mol

V = 1.31469*0.08205*295/0.938

V = 83.74L

The volume = 83.74L

4 0

2 years ago