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3 years ago

Which one of the following statements concerning the length of carbon-carbon single, double, and triple covalent bonds is true?

Chemistry

1 answer:

Likurg_2 [28]3 years ago

5 0

Answer:

$\color{Blue}\huge\boxed{Question}$

<h3>Which one of the following statements concerning the length of carbon-carbon single, double, and triple covalent bonds is true? </h3>

$\color{Blue}\huge\boxed{Answer}$

<h3>D. The carbon-carbon single, double, and triple bonds all have the same length.</h3>

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citric acid has an acid dissociation constant of 8.4 x 10^-4 it would be most effective for preparation of a buffer with a pH of

Sloan [31]

Answer:

(B) 3

Explanation:

Citric acid has an acid dissociation constant (Ka) of 8.4 × 10⁻⁴. When it forms a buffer with its conjugate base (citrate), we can calculate the pH using the Henderson-Hasselbalch's equation.

$pH=pKa+log\frac{[base]}{[acid]}$

The optimum range of pH is pKa ± 1. The pKa is -log Ka = -log (8.4 × 10⁻⁴) = 3.1. The buffer would be more effective for pH between 2.1 and 4.1, especially around 3.1. So the best choice is (B) 3.

5 0

3 years ago

Identify which of the following oxidation-reduction reactions are balanced and which are unbalanced in both mass and charge. 1.2

Ivenika [448]

Answer:

1. Balanced

2. Unbalanced

3. Unbalanced

Explanation:

<em>Identify which of the following oxidation-reduction reactions are balanced and which are unbalanced in both mass and charge. </em>

This reaction is balanced in both mass and charge.

This reaction is balanced in mass but unbalanced in charge since the charge to the left is +1 and the charge to the right is 2+.

This reaction is balanced in charge but unbalanced in mass since there are 2 atoms of H to the left and 3 atoms of H to the right.

3 0

3 years ago

A sled is at rest at the top of a slope 2 m high. The sled has a mass of 45 kg. What is the sleds potential energy

wel

Answer:

$\boxed {\boxed {\sf882 \ Joules}}$

Explanation:

Potential energy can be found by multiplying the mass by the height by the gravitational acceleration.

$PE=mgh$

The mass is 45 kilograms. The height is 2 meters. The gravitational acceleration on Earth is 9.8 meters per seconds squared.

$m=45 \ kg \\h= 2 \ m \\g=9.8 \ m/s^2$

Substitute the values into the formula.

$PE=45 \ kg * 2 \ m * 9.8 m/s^2$

Multiply.

$PE=441 kg*m/s^2*2 \ m$

$PE= 882 \ kg *m/s^2 *m$

1 kg*m/s^² is equal to 1 Newton (N). Substitute N in for kg*m/s²

$PE=882 \ N*m$

1 Newton meter (N*m) is equal to 1 Joule (J). Our current answer is equivalent to 882 Joules.

$PE= 882 \ J$

The sled's potential energy is 882 Joules.

8 0

3 years ago

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vagabundo [1.1K]

First, explain what a wave is, what a mechanical wave is, and what an electromagnetic wave is.

Wave: a disturbance (perturbation, pulse) that transport energy but not matter. They can translate either longitudinally (longitudinal waves) or transversally (transverse waves).

Mechanical waves: waves that need a medium to travel (transport its energy.

Examples of mechanical waves are: sound (longitudinal wave), water waves (transverse waves), rope wave (transverse waves), slinky waves (may be both transverse and longitudinal waves).

Electromagnetic waves: waves that can travel in the vacuum.

They are produced by the vibration of charged particles and are always transverse waves.

Examples of electromagnetic waves are: visible light, microwaves, ultraviolet waves, infrared waves, among other.

Now, you can understand these similarities and differences:

Similarities:

- Both can travel in the air and water.

- Both transfer energy (all waves to that)

Differences:

- Mechanical waves do not travel in empty space; electromagnetic waves do.

- Electromagnetic waves (light) slow down when pass from air to water (refraction of light); some mechanical waves (sound) speed up when pass from air to water.

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3 years ago

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Using this density column, list the substances in order from most dense to least dense.

dybincka [34]

The answer is C, Air is the least dense, water has be before oil because of polarity reasons and has a low density too

6 0

3 years ago

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