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2 years ago

Solid iron prllets are heated, melted and drawn into wires. This is an example of a chemical reaction. True or False

Chemistry

1 answer:

monitta2 years ago

6 0

Answer:

False

Explanation:

It is not true that this is an example of a chemical reaction. This is a typical example of physical reaction.

Most physical changes are often phase changes.

A phase change is a change in the physical state of a body.
In this change, it is from solid to liquid.
Now new substances are formed.
When substances are changed from one form to another, it is a physical change.

In a chemical change, a new substance is formed at the end of the process.

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2 years ago

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2. Calculate the density of a metal that occupies 17.75 cm and has a mass of 342.93 g. [D = m/V]

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Answer:

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A lake in rural maine drops in ph from 7 to 5 as a result of acid rain falling into it. how has the h+ ion concentration change

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3 years ago

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You perform a distillation to separate a mixture of propylbenzene and cyclohexane, and you obtain 2.9949 grams of cyclohexane (d

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Answer:

66.67%

Explanation:

From the given information:

mass of cyclohexane = 2.9949 grams

density of cyclohexane = 0.779 g/mL

Recall that:

Density = mass/volume

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Volume = mass/density

So, the volume of cyclohexane = 2.9949 g/ 0.779 g/mL

= 3.8445 mL

Also,

mass of propylbenzene = 1.6575 grams

density of propylbenzene = 0.862 g/mL

Volume of propylbenzene = 1.6575 g/ 0.862 g/mL

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The volume % composition of cyclohexane from the mixture is:

$= (\dfrac{v_{cyclohexane}}{v_{cyclohexane}+v_{propylbenzene}})\times 100$

$= (\dfrac{3.8445}{3.8445+1.9229})\times 100$

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= 66.67%

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2 years ago

Solid iron prllets are heated, melted and drawn into wires. This is an example of a chemical reaction. True or False​

Solid iron prllets are heated, melted and drawn into wires. This is an example of a chemical reaction. True or False