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3 years ago

Why would it be incorrect to balance the equation by changing NaOH to Na2OH2 instead of 2NaOH

1 answer:

6 0

Beacuse Na2OH 2 is completely different compound than 2NaOH.

By NaOH we mean two molecules with one sodium, one hydrogen and one oxygen atom each.

But by Na2OH2 it'll be understood that 2 atoms of sodium one aton of oxygen and 2 arom of hydrogen was used ro make up this one molecule.

Here's a simple example,

You have
H2+ O2 ---------> H2O

while balancing,

you're supposed to write H2O as 2H2O
which means 2 molecules of water.

And when you write it as H2O2 insted it means that you are forming and oxidizing and reducing agent, which is a waste (toxic waste) for our body and can kill us, which means it has the opposite property of water.

And this is the reason why you should balance it by placing the numbers on the far left side than subsripting it below atom of different elements so that you can make the same compund everytime.

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Vikki [24]

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3 years ago

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3 years ago

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3 years ago

Identify the true statements about surface tension. Molecules along the surface of a liquid behave differently than those in the

Alexxandr [17]

Answer:

Molecules along the surface of a liquid behave differently than those in the bulk liquid.

Cohesive forces attract the molecules of the liquid to one another.

Water forming a droplet as it falls from a faucet is a primary example of surface tension.

Explanation:

Surface tension is the force that stretches the liquid surface. This force acts normal to the surface. It is the downward force that acts on the surface of the liquids which is due to the cohesive forces of the liquids.

The water molecules are bonded by a strong hydrogen bond force which is between hydrogen atom and the electronegative oxygen atom. At the surface the water molecules are attracted strongly by other water molecules which lies below the surface and are stretched at the surface. Thus the water molecules at the surface acts differently than in the bulk liquid.

Mercury have a strong cohesive force than the water and have a higher surface tension force than the water.

Surface water acquires minimum surface area, hence acquiring spherical shape of water.

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3 years ago

1. Which of the following statements about mechanical waves is true?

Anna [14]

1. The answer is "a".

Mechanical waves require a medium to travel. If there is no medium, the mechanical wave doesn't travel. Since, they are waves; they have a wavelength, frequency, speed and also amplitude. The speed depends on the medium and type of the wave. An example for the mechanical waves is sound wave.

2. E = hf, where E is energy, h is plank constant and f is the frequency. Hence, if the frequency is high, then the energy is high.

v = fλ , where v is the speed, f is the frequency and λ is the wavelength. If the frequency is high, then the wavelength is low.

According to the given choices, gamma rays have the shortest wavelength and highest energy on electromagnetic spectrum.

3. The wavelength of X-rays are smaller the wavelength of infrared.

According to the v=fλ, lower the wavelength, then higher the frequency. According to the E = hf, if the frequency is high, then the energy is also high.

Hence, the correct answer is "d"

4. In a longitudinal wave (compression wave) the particles of a matter move parallel.

There are two types of waves according to the particle movement. They are transverse waves and longitudinal waves. In transverse waves, the particles of the medium move perpendicular to the direction of the wave and longitudinal waves have parallel movement of particles to the direction of wave.

5. In regard to spend of sound, sound travels slowest in gases.

Solids have the highest speed of sound while gases have the lowest. This is because of the particle arrangement of each phase. Solid phase has very tightly packed particle arrangement and due to that the transfer of sound wave in easy than in gases.

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4 years ago