CHEMISTRY HIGH SCHOOL

1. A tuning fork has a frequency of 280 hertz, and the wavelength of the sound produced is 1.5 meters. Calculate the velocity of the wave. - Answer:
2. A wave is moving toward shore with a velocity of 5.0 m/s. If its frequency is 2.5 hertz, what is the wavelength?
- Answer:
3. A jump rope is shaken producing a wave with a wavelength of 0.5 m. with the crest of the wave passing a certain point 7 times per second. What is the velocity of the wave?
- Answer:
4. The lowest pitch that the average human can hear has a frequency of 20.0 Hz. If sound with this frequency travels through air with a speed of 331 m/s, what is its wavelength?
- Answer:
5. A microwave has a frequency of 4,255 Hz. and a wavelength of 0.05 m. What is the microwave’s velocity?
- Answer:
6. A sound wave travels with a velocity of 460 m/s and has a frequency of 820 Hz. What is its wavelength?
- Answer:
7. A wave at sea travels with a velocity of 32 m/s. If it has a wavelength of 8 m. what is its frequency?
- Answer:
8. What is the frequency of a wave that has a velocity of 21.3 m/s and a wavelength of 7.8 m?
- Answer:

Answers

Answer 1
Answer:

Based on the calculation, the velocity of this wave is equal to 420 m/s.

Given the following data:

  • Frequency of turning fork = 280 hertz.
  • Wavelength of sound produced = 1.5 meters.

How to calculate the velocity of a wave?

Mathematically, the velocity of a wave is calculated by using this formula:

V = λF

Where:

  • F is the frequency of a wave.
  • V is the velocity of a wave.
  • λ is the wavelength of a wave.

Substituting the given parameters into the formula, we have;

V = 1.5 × 280

V = 420 m/s.

Note: You should use the above formula to solve the other questions.

Read more on frequency here: brainly.com/question/19250621

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Answer 2
Answer: velocity = frequency x wavelength. 1) v = 280 x 1.5 = 420m/s 2) w = v / f = 5 / 2.5 = 2m 

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HI(aq)+KOH(aq)→H2O(l)+KI(aq) express this as a complete ionic equationHI(aq)+KOH(aq)→H2O(l)+KI(aq) express this as a complete ionic equation

Answers

The complete ionic equation is as follows: H+_(aq) + I ^-_(aq) +K^+_(aq) +OH^-_(aq)\rightarrowH₂O_(l) +K ^+_(aq) +I^-_(aq)

What is ionic equation?

Ionic equation is defined as a chemical equation which represents electrolytes in aqueous solutions and are expressed as dissociated ions. Ions present in aqueous solutions are stabilized by ion dipole interactions with the water molecules which are  present.

An ionic equation can be written for any electrolyte which dissociates and reacts with the polar solvent. In a balanced ionic equation , number and type of atoms on each sides of reaction arrow are same. Even the net charge on both sides of the arrow is same.

Strong acids and bases exist as dissociated ions present in the solution and are written in forms of ions in ionic equation.Weak acids and bases do not dissociate completely  and hence are written in the form of molecular formula.

Learn more about ionic equations ,here:

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HI(aq) + KOH(aq) ---> H2O(l) + KI(aq)

H+(aq) + I-(aq) + K+(aq) + OH-(aq) ------> H2O(l) + K+(aq) + I-(aq)

H+(aq) + OH-(aq) ----> H2O(l)

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A single nitrogen atom has five electrons in its outer energy level to start, and will be most stable with an octet, or 8 electrons in its outer level.

Since N2 is a covalent bond, the lewis dot structure of  N2 would have a triple bond. Each bond contains 2 electrons, so if it has a triple bond it contains 6 electrons. 
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So, therefore, 6 electrons would have to be a part of covalent bonds because they share 6 electrons in a triple bond. 
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