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4 years ago

Please ive been stuck on this one forever

Chemistry

1 answer:

Natasha2012 [34]4 years ago

5 0

Answer:

Melting-Solid-Liquid-Added

Freezing-Liquid-Solid-Removed

Vapourization-Liquid-Gas-Added

Condensation-Gas-Liquid-Removed

Sublimation-Solid-Gas-Added

Deposition-Gas-Solid-Removed

Explanation:

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Which one of these examples shows a homogeneous mixture? oil and vinegar or salt water

kumpel [21]

<span>chemical combination of two or more elements in definite proportions. For example, two hydrogen molecules + one oxygen molecule= one water molecule. A solution is a physical combination of two or more chemicals mixed evenly (salt that is dissolved in water). Solutions are also known as homogenous mixtures. A mechanical mixture is a physical combination of two or more chemicals that are not evenly mixed (hot fudge on ice cream). </span>

4 0

3 years ago

Read 2 more answers

In vacuum, the speed of light is c= 2.998 x 108m/s. However, the speed generally decreases when light travels through media othe

Kaylis [27]

Answer:

Light of wavelength 200 nm will have lowest frequency in while traveling through diamond.

Explanation:

Speed of the light in vacuum = c

Relation between speed of light , wavelength (λ) and frequency (ν);

$\nu =\frac{c}{\lambda }$

Speed of light in a medium = c' = c/n

$\nu =\frac{c'}{\lambda }=\frac{c}{n\times \lambda }$ ...[1]

Where : n = refractive index of a medium

So, the medium with greater value of refractive index lower the speed of light to greater extent.

From [1] , we can see that frequency of light is inversely proportional to the refractive index of the medium :

$\nu \propto \frac{1}{n}$

This means that higher the value of refractive index lower will be the value of frequency of light in that medium or vice-versa.

According to question, light of wavelength 200 nm will have lowest frequency in while traveling through diamond because refractive index of diamond out of the given mediums is greatest.

Increasing order of refractive indices:

$H_2$

Decreasing order of frequency of light 210 nm in these medium :

$H_2>H_2O>CCL_4>\text{Silicon oil}> Diamond$

4 0

3 years ago

How does the size of the atom (atomic size) change as you move from the LEFT side to RIGHT side of the Periodic Table?

Shtirlitz [24]

Answer:

Explanation:

As you move from left to right, the number of protons increases. More protons means a bigger positive charge to pull in the electrons from the shells. This would then decrease the size of the atom.

Thus, the answer is B, the size decreases.

Hope this helps!

3 0

4 years ago

Read 2 more answers

A solution of nitrous acid and potassium nitrite acts as a buffer due to reactions that occur within the solution when a strong

Ghella [55]

Answer:

a. NO₂⁻ + H⁺ → HNO₂

b. HNO₂ + OH⁻ → NO₂⁻ + H₂O

Explanation:

A buffer is defined as an aqueous mixture of a weak acid and its conjugate base or vice versa.

The buffer of the problem is HNO₂/NO₂⁻ <em>where nitrous acid is the weak acid and NO₂⁻ is its conjugate base.</em>

a. When a acid is added to a buffer as the buffer of the problem, the conjugate base will react with the acid, to produce the weak acid, thus:

NO₂⁻ + HCl → HNO₂ + Cl⁻

Ionic equation is:

NO₂⁻ + H⁺ + Cl⁻ → HNO₂ + Cl⁻

In the net ionic equation, you avoid the ions that don't react, that is:

b. In the same way, the weak acid will react with the strong acid producing water and the conjugate base, thus:

HNO₂ + NaOH → NO₂⁻ + H₂O + Na⁺

The ionic equation is:

HNO₂ + Na⁺ + OH⁻ → NO₂⁻ + H₂O + Na⁺

And the net ionic equation is:

5 0

3 years ago

What is the percent by mass of water in the hydrate? %

dusya [7]

Sorry I can't tell you the answer but, I can tell you something...

Dividing the mass of the water lost by the mass of hydrate used is equal to the fraction of water in the compound. Multiplying this fraction by 100 gives the percent water in the hydrate.

How to find it?

Divide the mass of the water lost by the mass of hydrate and multiply by 100. The theoretical actual percent hydration percent water can be calculated from the formula of the hydrate by dividing the mass of water in one mole of the hydrate by the molar mass of the hydrate and multiplying by 100.

8 0

3 years ago

Please ive been stuck on this one forever​

Please ive been stuck on this one forever