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3 years ago

Is bleaching your hair a physical or chemical change and why

2 answers:

8 0

Bleaching your hair is a chemical change because it is undergoing a process that changes the chemical makeup of the hair. Think of this: if you had a sample of hair from before you bleached it and after you bleached it, they would look completely different from each other, unlike if you had just cut a piece of hair off.

melisa1 [442]3 years ago

3 0

I think its chemical change is because leach has chemicals and other stuff on it so I think its chemical change

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What is another name for watershed

Sati [7]

Answer:

shed wadet

Explanation:

8 0

3 years ago

Calculate the mole fraction of the ionic species kcl in the solution.

sp2606 [1]

The question is incomplete, here is the complete question:

Calculate the mole fraction of the ionic species KCl in the solution A solution was prepared by dissolving 43.0 g of KCl in 225 g of water.

Answer: The mole fraction of KCl in the solution is 0.044

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

For water:

Given mass of water = 225 g

Molar mass of water = 18 g/mol

Putting values in equation 1, we get:

$\text{Moles of water}=\frac{225g}{18g/mol}=12.5mol$

For KCl:

Given mass of KCl = 43 g

Molar mass of KCl = 74.55 g/mol

Putting values in equation 1, we get:

$\text{Moles of KCl}=\frac{43g}{74.55g/mol}=0.577mol$

Mole fraction of a substance is given by:

$\chi_A=\frac{n_A}{n_A+n_B}$

For KCl:

Moles of KCl = 0.577 moles

Total moles = [0.577 + 12.5] = 13.077 moles

Putting values in above equation, we get:

$\chi_{(KCl)}=\frac{0.577}{13.077}=0.044$

Hence, the mole fraction of KCl in the solution is 0.044

8 0

3 years ago

Adenosine triphosphate, or ATP, is primarily used as _______ in living organisms.

Stolb23 [73]

It is primarily used as a way to supply energy to other cells

5 0

3 years ago

Read 2 more answers

A solvent is simply a substance that can dissolve other molecules and compounds, ... Because of its polarity and ability to form

Arte-miy333 [17]

Answer:

The high dipole moment of water and its ease in forming hydrogen bonds make it an excellent analysis. A molecule is soluble in water if it can interact with its molecules through hydrogen bonds or ion-dipole interactions.

With anions that have oxygen they can form hydrogen bonds, since oxygen acts as their acceptor. The attraction of the anion on the water dipole must be taken into account. The same goes for Cl-F, which have solitary electron pairs and can act as hydrogen bridge acceptors. On the other hand, cations such as Na+, K+, Ca++ or Mg++ are surrounded by water molecules to which they are joined by dipole ion interactions while oxygen atoms are oriented towards the catión.

Explanation:

5 0

3 years ago

Look up sodium in the Periodic Table (Na). Then, answer the following questions

madreJ [45]

There are 11 electrons in Sodium(Na)
The first shell can hold 2 electrons
The second shell can hold 8 electrons
The third shell can also hold 8 electrons but there is only 1 left

so the answer is 2, 8, 1

4 0

3 years ago