A scientist discovers a new type of polymer. What must be true about this polymer?

Chemistry

2 answers:

kolbaska11 [484]3 years ago

7 0

This polymer must D. be made of large molecules with repeating units.

A polymer consists of long chains of smaller repeating units called <em>monomers</em>.

For example, <em>polyethylene</em> consists of long chains of ethylene (CH₂=CH₂) units joined together end to end.

The formula for polyethylene is -CH₂CH₂-(CH₂CH₂)ₙ-CH₂CH₂-, where n is usually a number between 500 and 10 000.

ValentinkaMS [17]3 years ago

7 0

The correct answer is D

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Which statement about liquid state of matter is true?

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3 years ago

4 pts

Digiron [165]

First we need to find the number of moles that 43.9g of gallium metal is. We can do this by finding the molar weight of gallium and cross-multiplying to cancel out units:

$\frac{1mole}{69.723g} *\frac{43.9g}{1} =0.63MOLga$

So we are dealing with 0.63 moles of gallium metal.

We can take from the balanced equation that 4 moles of gallium metal will react completely with 3 moles of oxygen gas. We can take this ratio and make a proportion to find the amount of oxygen gas, in moles, that will react completely with 0.63 moles of gallium metal:

$\frac{4molesGa}{3moles02} =\frac{0.63molesga}{xmoleso2}$

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3 years ago

using the equation 2h2+o2-->2h2o if 192g of oxygen are produced how many grmas of hydrogen must react with it

Brilliant_brown [7]

Equation: 2H₂ + O₂ → 2H₂O

Now, Given mass of Oxygen = 192 g
Molar mass of Oxygen = 16 g/mol

No. of moles in Oxygen = 16/192 = 0.0833

Now, for every mole of Oxygen, 2 mole of Hydrogen will form,
so, Number of moles of Hydrogen = 0.0833 * 2 = 0.167

Given mass = Number of Moles * Molar mass
Given mass = 0.167 * 2
m = 0.33 g

In short, Your Answer would be: 0.33 g

Hope this helps!

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