Is cutting your hair a physical or chemical change

Answers

Answer 1

Answer:

Everything around us undergoes some changes. The changes can be either physical or chemical. The cutting of hair is an example of physical change.

What is physical change?

The physical change is defined as the type of change in which the physical properties of matter such as colour, state of matter, odour, solubility, etc. change. During this change neither the composition nor the chemical nature of the substance is changed.

In a physical change the molecules rearrange among themselves without affecting the internal composition. The chemical property of a substance is not affected by the physical change. But in chemical change the chemical composition of the matter change.

When you cut your hair, some of it is removed it is still your hair. The hair is altered somehow but remains the same substance. Hence it is a physical change. Other examples are cutting paper, melting of ice, etc.

Thus cutting your hair is a physical change.

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Answer 2

Answer: A physical change because you are not changing the chemical composition of your hair. In theory, you could still put that hair back onto your head and it would match the hair still on your head. If it was chemically changed, you would not be able to replace it. Think of wood burning; you can't turn those ashes back to wood, now can you?

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Answer:

I think It's either A. or C.

Explanation:

Answer:

Explanation:

Why can water dissolve many ionic compounds

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To dissolve an ionic compound, the water molecules must be able to stabilize the ions that result from breaking the ionic bond. Water is a polar molecule. It has a permanent dipole. ... The negative ions have several water molecules around them, all with their H atoms close to the negative ion

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Combustion reaction all follow a similar pattern, complete the work equation below Hydrocarbon + ... ---> Carbon... + ....

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Hydrocarbon + Oxygen → Carbon dioxide + Water

How do you do problem #15?

Answers

you would convert the cg to g. 1.66 cg is 0.0166 g. then you add. 0.398 + 0.0166 = 0.4146. the answer is 0.4146 grams.

What is the formula mass of calcium sulfate dihydrate [CaSO4⋅2H2O]?Be sure to add the water of hydration, which is the 2H2O part (water surrounding the calcium sulfate).

136 g/mol

154 g/mol

164 g/mol

172 g/mol

172 is correct

Answers

Answer:

Option d = 172 g/mol

Explanation:

Formula mass of [CaSO₄.2H₂O]

Formula mass = 40.078 + 32.065 + 4×16 + 4 + 16×2

Formula mass = 40.078 + 32.065 + 64 + 4 + 32

Formula mass = 172.143 g/mol

so, 172 g/mol is the correct answer.

The formula mass of compound calcium sulfate dihydrate is 172 g/mole.

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:

1)Molecular compounds where in atoms are joined by covalent bonds.

2) ionic compounds where atoms are joined by ionic bond.

3)Inter-metallic compounds where atoms are held by metallic bonds

4) co-ordination complexes where atoms are held by co-ordinate bonds.

The formula mass of compound = 40+32+16×4+4+32=172 g/mole.

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During natural selection, which organisms are most likely to survive as the environment changes