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AURORKA [14]
3 years ago
13

7. What color would a solution with pH 5.5 be when mixed with phenolphthalein indicator

Chemistry
1 answer:
Neporo4naja [7]3 years ago
5 0
The indicator remains colourless in a solution with a pH between 1-7. It turns a solution with a pH higher than 8 pink. So your given solution would not change in colour.
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Mention the four characterstics of warm blooded animals.<br>​
Igoryamba

Answer:

The four characrteristics of warm blooded animals are÷

Explanation:

i=They can keep its body temperature the same no matter what the outside temperature .

ii=They can maintain a constant body temperature.

iii=They obtain energy from food consumption.

iv=They maintain their body temperature higher than environment.

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What does the color red means
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2 years ago
How many moles of 02 can be prepared from 6.75 moles of KCIO3 ?
Varvara68 [4.7K]

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5 0
3 years ago
How many grams of SnO2 are required to produce 1.20x10^21 molecules of water?
Drupady [299]

Answer:

  • <u>0.150 grams</u>

<u></u>

Explanation:

The balanced chemical reaction to obtain water from SnO₂ is:

  • SnO₂ + 2H₂ → Sn + 2H₂O

The mole ratio is:

          \dfrac{1molSnO_2}{2molH_2O}

Find the number of moles equivalent to  1.20× 10²¹ molecules of water, using Avogadro's number:

         1.20\times 10^{21}molecules\times \dfrac{1mol}{6.022\times 10^{23}molecules}=1.9927\times 10^{-3}moles

From the mole ratio, the number of moles of SnO₂ are half the number of moles of water. That is:

  • 0.0019927 moles / 2 = 0.00099635 moles of SnO₂

Use the molar mass of SnO₂ to convert the number of moles to grams:

  • molar mass of SnO₂ = 150.71g/mol
  • mass of SnO₂ = 0.00099635mol × 150.71 g/mol = 0.150 grams.

The answer must be reported with 3 significant figures.

8 0
3 years ago
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