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taurus [48]
2 years ago
5

What kind of graph would use for this data? The months of the year and the amount of rainfall, and why

Chemistry
1 answer:
Digiron [165]2 years ago
6 0

Answer:

A Desert Climatogram is a graph that shows the temperature and rainfall, for each month in the year, for the Desert.

Explanation:

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Na and Cl are chemical symbol
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Answer:

Cl is chloride I think, and NaCl is a salt molecule

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Which of the following can be found in an atom's nucleus?
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3 years ago
2. Acidity and basicity of solutions of common substances at 25 ºC: a. Calculate the pH of a sample of lemon juice with [H+ ] =
Lelechka [254]

Answer:

a. The pH of a sample of lemon juice with [H⁺] = 3.8*10⁻⁴ M is 3.4, indicating acidity.

b. The pH of a commonly available window-cleaning solution with [OH⁻] = 1.9*10⁻⁶ M is 8.28,  indicating basicity.

c. The [H⁺] is 1.74*10⁻⁴ M.

d. The [OH⁻] is 1.51*10⁻⁵ M.

Explanation:

pH is a measure of acidity or alkalinity that indicates the amount of hydrogen [H⁺] or hydronium [H₃O⁺] ions present in a solution or substance. Mathematically the pH is the negative logarithm of the molar concentration of the hydrogen or proton ions (H⁺) or hydronium ions (H₃O⁺):

pH= -log₁₀ [H⁺]= -log₁₀ [H₃O⁺] or pH= -log [H⁺]= -log [H₃O⁺]

The pH scale ranges from 0 to 14. Values ​​less than 7 indicate the acidity range and those greater than 7 indicate alkalinity or basicity. Value 7 is considered neutral.

<u><em>Case a</em></u>

You know [H⁺]= 3.8*10⁻⁴ M. Then:

pH= -log (3.8*10⁻⁴)

pH=3.42

<em>The pH of a sample of lemon juice with [H⁺] = 3.8*10⁻⁴ M is 3.4, indicating acidity.</em>

<u><em>Case b</em></u>

Like pH, pOH (or OH potential) is a measure of the basicity or alkalinity of a solution.

The pOH indicates the concentration of hydroxyl ions [OH-] present in a solution:

pOH= -log₁₀ [OH⁻]= -log [OH⁻]

The pOH is related to the pH by the formula:

pH + pOH= 14

In this case you know [OH⁻]=1.9*10⁻⁶ M. Then:

pOH= -log(1.9*10⁻⁶)= 5.72

So pH + 5.72= 14

pH= 14 - 5.72

pH= 8.28

<em>The pH of a commonly available window-cleaning solution with [OH⁻] = 1.9*10⁻⁶ M is 8.28,  indicating basicity.</em>

<u><em>Case c</em></u>

You know pH=3.76. Then:

3.76= -log [H⁺]

-3.76= log [H⁺]

[H⁺]=10^{-3.76}

[H⁺]= 1.74*10⁻⁴ M

<em>The [H⁺] is 1.74*10⁻⁴ M.</em>

<u><em>Case d</em></u>

You know that pH + pOH=14 and pH is 9.18. Then

9.18 + pOH=14

pOH=14 - 9.18

pOH= 4.82

You know pOH= - log [OH⁻]. Then:

4.82= -log [OH⁻]

-4.82= log [OH⁻]

[OH⁻]=10^{-4.82}

[OH⁻]= 1.51*10⁻⁵ M

<em>The [OH⁻] is 1.51*10⁻⁵ M.</em>

3 0
2 years ago
List at least one reason for not touching the magnesium metal with bare hands. 3. list two reasons for using crucible tongs to h
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The magnesium metal is highly reactive and can ignite in contact with moisture or even air. The skin is usually covering in moisture, so the contact with it may cause a reaction that can produce irritation, lesions and even burns.

Crucible tongs are mandatory to handle hot crucibles to avoid skin burns and accidents during experimental procedures. Crucible tongs work with the crucible; their shape was designed to firmly hold it to avoid spills.

5 0
3 years ago
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Mass is measure in? and wieght is measured in?
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Mass is measured in kg and weight is measured in pounds.
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