The density of aluminum is 2.70 g/cm3. Apiece of aluminum foil that is 1000 cm on each side has a mass of 440. mg. How thick is the piece of foil?

Answers

Answer 1

Answer: mass/volume = density
mass = (440 mg)*(1g)/(1000mg) = 0.440g
volume = (1000cm)(1000cm)(t)
where t = thickness
density = 2.70 g/cm^3 = (0.440g)/((1000cm)(1000cm)(t))

multiply both sides by 't' and divide both sides by (2.70g/cm^3)

t = (0.440) / ((1000cm)(1000cm)(2.70)) = 1.629x10^-7 cm

t = (1.629 x 10^-7 cm)*(1000000 micrometers)/(1 cm) = 0.1629 micrometers

Answer is t = 0.1629 micrometers

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Which formulas represent two polar molecules?(1) CO2 and HCl (3) H2O and HCl
(2) CO2 and CH4 (4) H2O and CH4

Answers

The correct answer is shown in option 3. Water and hydrochloric acid are polar molecules. These molecules are polar because of the presence of bonds that are partially ionic or polar covalent bonds. Other examples are hydrogen fluoride and ammonia.

How many moles are there in 77.1 g of cl2?

Answers

According to the mole concept, there are 1.8074 moles in 77.1 g of chlorine.

What is a mole?

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Number of moles is calculated as, mass/molar mass

Substituting values in formula gives, number of moles=77.1/70.90=1.8074

Thus, there are 1.8074 moles in 77.1 g of Cl₂.

Learn more about mole,here:

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There are 70.90g of Cl2 in 1 mol (because 35.45g Cl in one mol). So 77.1g/70.9g≈1.0874 mol.

Prior to the Civil War, the North had 80 percent of the _____ capacity in the United States.A. agricultural
B. political
C. manufacturing
D. military

Answers

Answer:

C. manufacturing

Explanation:

With the Independence of the Thirteen Colonies in 1776, the colonies became independent states, but united in a Federation, with republican and presidential political representation. States in the northern region concentrated on the development of industry and, to that end, needed free and salaried labor to operate the work within the factories. Prior to the secession war, the northern states had 80 percent of manufacturing capacity in the United States. The formation of the working class and the industrial bourgeoisie in the North has also produced a specific way of looking at political activity and civil rights.

The North had 80% of the manufacturing capacity in the U.S. before the Civil War. The North was filled with factories, whereas the South relied on farming and slaves to survive, they produced a lot of cotton and tobacco for example. During the Civil War as you could imagine, the North was making a lot of artillery, so its economy began to expand more to meet the demands of war.

When two continental plates of similardensities collide,
A. they remain level since densities in both plates are equal.
B. they both push back down into the mantle
C. one plate rides over the other one and forms a trench
D.they buckle upward and form mountains

Answers

Answer:

D. They buckle upward and form mountains.

Explanation:

When two plates (either oceanic or terrestrial) converge and they are of similar density then they will crash into each other and form mountains. A great example of this is when India crashed into the Asian continent and the Himalayas were formed.

An atom of which element has the strongest attraction for electrons? A) Ba
B) Cs
C) O
D) F

Answers

(D) F because it has the highest electronegativity

F - Fluorine, it is the most electronegative element meaning is has the greatest attraction for electrons.

How many molecules are there in 79g of Fe2O3? how many atoms is thi

Answers

Molar masses:
$m_(Fe) = 56g/mol\nm_(O) = 16g/mol\n\n\therefore m_{Fe_(2)O_(3)} = 2 \cdot (56)+3 \cdot (16) = 112+48 = 160g/mol$

So:

$1mol \ Fe_(2)O_(3) = 160g = 6 \cdot 10^(23)molecules$

160g ---------- 6·10²³molecules
79g ---------- x

x = 2.9625·10²³ molecules

1molecule = 5 atoms
2.9625·10²³ molecules = 2.9625·10²³·5 = 14.8125·10²³ atoms

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