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2 years ago

Does Polyethylene terephthalate (PET) float on water? salt water? hot water?

1 answer:

4 0

For the given question above, Polyethylene Terephthalate (PET) is a resin of a polyester family making it an organic molecule. Its density is 1.40 g/cm³. The other choices are water (density of 1.00 g/cm³), seawater (1.025 g/cm³), and hot water (less than 1.00 g/cm³). Being that PET is the most dense in relation to the three aforementioned liquids, it would not float atop any. I hope this helps.

You might be interested in

How many valence electrons does each of the following atoms have, and how many bonds will each form?

fredd [130]

Kr has 18 and As is 15 BC of the group #

5 0

3 years ago

What is the mol ratio between A and D in the following reaction? 4A + 5B → 2C + 3D

bonufazy [111]

Answer:

$\boxed {\boxed {\sf \frac{ 4 \ mol \ A}{3 \ mol \ D}}}$

Explanation:

The mole ratio in a balanced equation tells us the number of moles of each reactant needed and how many moles of product will be made.

We are asked to find the mole ratio between A and D for this reaction.

$4A + 5B \rightarrow 2C + 3D$

The mole ratio is found by comparing the coefficients, which are the numbers in front of the formulas.

A has a coefficient of 4 and D has a coefficient of 3.

Therefore, the ratio between A and D is:

4:3
$\frac{ 4 \ mol \ A}{3 \ mol \ D}$

7 0

2 years ago

The discovery of atomic structure in the early 1900’s was discussed in Chapter 2 of your textbook. One atomic model proposed dur

insens350 [35]

Answer:

The correct option is: (C) It included negatively charged particles.

Explanation:

Sir Joseph John Thomson proposed an atomic model, known as the plum pudding model in 1904.

In this model, he compared an atom to a plum pudding and suggested that the negatively charged electrons are the plums that are embedded in a uniform positively charged spherical pudding.

Therefore, according to the plum pudding model, an atom has no net electric charge and contains negatively charged electrons.

7 0

2 years ago

What is the mole fraction of sodium chloride in solution that is 13. 0 y mass sodium chloride and that has a density of 1. 10 g/

lyudmila [28]

Mole fraction is the ratio of the constituent moles to the total constituents. The mole fraction of sodium chloride is 0.0443.

<h3>What is a mole fraction?</h3>

A mole fraction is the proportion of the moles of the component in a total component present.

In 100 gm of solution 13.0 5 means, there is 13.0 gm of sodium chloride present. The mass of water is calculated as,

100 - 13.0 = 87.0 gm

Moles of sodium chloride is calculated as:

$\begin{aligned} \rm moles &= \rm \dfrac{mass}{molar\; mass} \\\\&= \dfrac{13}{58}\\\\&= 0.224 \;\rm moles\end{aligned}$

Moles of water are calculated as:

$\begin{aligned} \rm moles &= \rm \dfrac{mass}{molar\; mass} \\\\&= \dfrac{87}{18}\\\\&= 4.83\;\rm moles\end{aligned}$

Now, moles fraction is calculated by dividing moles of sodium chloride by total moles as,

$\begin{aligned} \text{Mole fraction of NaCl} &= \dfrac{0.224}{0.224 + 4.83}\\\\&= 0.0443\end{aligned}$

Therefore, the mole fraction of sodium chloride is 0.0443.

Learn more about mole fraction here:

brainly.com/question/8076655

#SPJ4

7 0

1 year ago

Calculate moles of Fe in 5.22 X 10^22 atoms of Fe?

Setler [38]

Answer:

The amount of moles of Fe in 5.22*10²² atoms of Fe is 0.0867.

Explanation:

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023*10²³ particles per mole. Avogadro's number represents a quantity without an associated physical dimension, so it is considered a pure number that allows describing a physical characteristic without an explicit dimension or unit of expression. Avogadro's number applies to any substance.

Then you can apply the following rule of three: if 6.023*10²³ atoms are contained in 1 mole, 5.22*10²² atoms are contained in how many moles?

$amount of moles=\frac{5.22*10^{22}atoms * 1 mole}{6.023*10^{23}atoms}$

amount of moles= 0.0867

The amount of moles of Fe in 5.22*10²² atoms of Fe is 0.0867.

5 0

2 years ago