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Zigmanuir [339]
3 years ago
13

Which statement is true of phenolphthalein?

Chemistry
2 answers:
Anna007 [38]3 years ago
5 0

The correct option is B.

Phenophtalein is an indicator that is usually used in acid base titration experiments. Indicators are substances that undergo distinct, observable changes when the pH of their solutions change. Indicators exhibit changing of colors depending on the pH of the solution in which they are found. They are usually weak bases and acid which are capable of partial dissociation and formation of ions when dissolved in water. There are different types of indicator and phenophtalein is one of them. Phenophtalein is colorless in acidic solution and pink in basic solutions.

Lesechka [4]3 years ago
3 0
B is the true statement

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When concentrated nitric acid mixed with some concentrated sulfuric acid reacts with benzene at moderate temperature forms------
FrozenT [24]
I will help just send me it
5 0
2 years ago
Which evidence cannot be found in spoiled foods?
eimsori [14]

Answer:

a. Change of state

Explanation:

Because you will see that the state has changed

8 0
2 years ago
How many moles of N2O5 are needed<br> to produce 7.90 g of NO2?
Roman55 [17]

Answer:

0.085 moles of  N₂O₅ are needed

Explanation:

Given data:

Mass of NO₂ produces = 7.90 g

Moles of N₂O₅ needed = ?

Solution:

2N₂O₅       →     4NO₂  + O₂

Number of moles of NO₂ produced :

Number of moles = mass/ molar mass

Number of moles = 7.90 g/ 46 g/mol

Number of moles = 0.17 mol

now we will compare the moles of NO₂   with N₂O₅.

                NO₂          :       N₂O₅

                  4            :          2

                0.17          :         2/4×0.17 = 0.085 mol

Thus, 0.085 moles of  N₂O₅ are needed.

4 0
3 years ago
Which statement correctly describes the relationship between thermal energy and particle movement?
Hunter-Best [27]

As thermal energy increases and there is more particle movement.

  • Thermal energy is the energy possessed by the system or object due to the movement of its particles.
  • For example kinetic energy of the particles
  • Higher the motion of the particles more will be the thermal energy of the system or object and vice-versa
  • It is also termed as heat energy of a system or object
  • The higher the thermal energy, the higher will be the temperature and vice versa.

So, from this, we can conclude that as thermal energy increases and there is more particle movement.

Learn more about thermal energy here:

brainly.com/question/21162439?referrer=searchResults

brainly.com/question/11278589?referrer=searchResults

5 0
2 years ago
William adds two values , following the rules for using significant figures in computations. He should write the sum of these tw
yuradex [85]

Answer:

when it comes to adding or subtracting numbers, his final answer should have the same number of decimal places as the least precise value.

For example if you add 2 numbers; 10.443 + 3.5 , 10.443 has 3 decimal places and 3.5 has only one decimal place.

Therefore 3.5 is the less precise value.

So when adding these 2 values the final answer should have only one decimal place.

after adding we get 13.943 but it can have upto one decimal place. then the second decimal place is less than 5 so the answer should be rounded off to 13.9.

the answer is the same number of decimal places as the least precise value

Explanation:

I think this is the answer I'm not sure

7 0
2 years ago
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