CHEMISTRY HIGH SCHOOL

In an experiment, 12.0 dm3 of oxygen, measured under room conditions, is used to burn completely 0.10 mol of propan-1-ol. What is the final volume of gas, measured under room conditions? A 7.20 dm3 B 8.40 dm3 C 16.8 dm3 D 18.00 dm3

Answers

Answer 1

Answer:

The chemical reaction is

C3H8O + (9/2) O2 = 3CO2 + 4H2O

Theoretical amount of oxygen needed = 0.1 mol of propanol ( 4.5 mol O2 / 1 mol propanol) = 0.45 mol

The amount of oxygen used in mol can be calculated using the ideal gas equation

PV = nRT

@room conditions

P = 1 atm

T = 25C ~ 298 K

R = 0.08205 mol – L/ atm – K

1 dm3 = 1 L

(1 atm) (12 L) = n (0.08205)*(298K)

n = 0.49 mol O2

Excess O2 = 0.49 – 0.45 = 0.04 mol O2

Amount of CO2 produced = 0.1 mol propanol (3 mol CO2/ 1 mol propanol) = 0.3 mol

Amount of H2) produced = 0.1 mol propanol (4 mol H2O/ 1 mol propanol) = 0.4 mol

TOTAL amount of gases = 0.04 + 0.3 + 0.4 = 0.74 mol

Therefore

V = (0.74*0.08205*298)/1

V = 18.0 dm3, the answer is letter D

Answer 2

Answer:

Answer:The the correct answer is option (A).

Explanation:

$2C_3H_7OH+9O_2\rightarrow 6CO_2+8H_2O$

12 L of oxygen gas burns 0.10 mol of propanol.(1 L = 1 $dm^3$ )

According to reaction, 2 moles of propanol gives 6 moles of $CO_2$ then, 0.10 moles of propanol will give: $(6)/(2)* 0.10$ moles of $CO_2$ that is 0.30 mol.

$n_(CO_2)=0.30 mol$

The final volume of the gas evolved after the reaction can be determined by Ideal gas equation. Since, the reaction is taking place at room temperature the value of pressure and temperature will be:

At room temperature:

Pressure = 1 atm

Temperature , T= 293 K

$PV=nRT$

$PV=n_(CO_2)RT$

$V_(CO_2)=(0.30 mol * 0.0821 L atm/mol K* 298 K)/(1 atm)=7.33 L=7.33 dm^3$

The closest answer from the given options is option (A) that is 7.20 $dm^3$

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The figure shows a nutrition label. How much energy does this food contain?

Answers

Answer:

i need help with that too.

Explanation:

2. Based on what you know about waves and light, do you think that light can bemodeled as a wave? Explain why or why not.

Answers

Answer:

Light as a wave: Light can be described (modeled) as an electromagnetic wave. In this model, a changing electric field creates a changing magnetic field. This changing magnetic field then creates a changing electric field and BOOM - you have light. ... So, Maxwell's equations do say that light is a wave.

Explanation:

Hope this helps

Answer:

Explanation:

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The diagram shows the electron arrangement in a molecule of ammonia, showing only outershell electrons.
I
H
(i) State the type of bonding in ammonia.
1
6

Answers

The diagram shows 5 eletctron in the outermost shell of Nitrogen atom out of which 3 electrons are involved in the bond formation with 3Hydrogen atoms.

The type of bond in ammonia is Covalent.

What is covalent bond ?

Covalent bond is the bond formed by mutual Sharing of electrons by both the atoms taking part in the bond formation.

Nitrogen has 5valence electrons of which only 3 are shares with the 3 atoms of hydrogen (one electron shares with one atom of hydrogen)

Hence, type of bond in ammonia is covalent.

Learn more about covalent bond here ;

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Final answer:

Ammonia (NH3) has a covalent bonding type resulting in a tetrahedral electron-pair geometry, but because of the lone pair, the molecular structure is trigonal pyramidal. The bond angle is slightly less than 109.5⁰ due to the lone pair occupying more space.

Explanation:

The type of bonding in ammonia, which has a molecule structure as shown in the question, is covalent bonding. The ammonia molecule, NH3, has one lone pair and three single bonds which gives it a tetrahedral electron-pair geometry, as shown in Figure 7.18. However, because one of these regions is a lone pair that is not counted in the molecular structure, the molecule assumes a trigonal pyramidal shape.

The lone pair occupies more space than the single bonds, which leads to a slight deviation in the actual bond angles from the idealised angles. The angle in the ammonia molecule is slightly less than 109.5⁰ due to this additional electron pair's space occupancy.

Learn more about Covalent Bonding in Ammonia here:

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When you accidentally overfill a water glass, the water takes on a dome-like or convex shape, but a half-filled water glass takes on a concave shape, in which the water is higher at the sides of the glass. This is because:Within the glass, adhesive forces dominate, and on top of the glass, cohesive forces dominate.

Within the glass, water tries to maximize its surface area, and on top of the glass, water tries to minimize its surface area.

Water's surface tension is greater inside the glass than on top of the glass.

Adhesive forces between water and the glass get weaker with height.

Answers

Answer: The correct answer is within the glass, adhesive forces dominate, and on top of the glass, cohesive forces dominate.

Explanation:

Adhesive forces are defined as the molecular forces which are present between different substances. For Example: When water is poured into glass, the molecular forces between the walls of container and water molecules.

Cohesive forces are defined as the molecular forces which are present between same substances.

When water is put in the glass, two types of meniscus form, one is concave meniscus and another is convex meniscus.

Concave meniscus is formed due to adhesive forces and is dominating inside the glass.

Convex meniscus is formed due to cohesive forces and is dominating on the top of glass. As, on the top of glass no walls of glass are present. So, water molecules stick together to other water molecules.

Hence, the correct answer is within the glass, adhesive forces dominate, and on top of the glass, cohesive forces dominate.

The water is higher at the sides of the glass. This is because within the glass, adhesive forces dominate, and on top of the glass, cohesive forces dominate.

Radioactive cobalt-60 is used in radiation therapy treatment. Cobalt-60 undergoes beta decay. This type of nuclear reaction is called(1) natural transmutation
(2) artificial transmutation
(3) nuclear fusion
(4) nuclear fission

Answers

The answer is (1) natural transmutation. When Co-60 undergoes beta decay (be it beta positive or beta negative), the product is another element (Fe or Ni). Transmutation is when an element turns into another element via a nuclear process. Since this occurs without the aid of another agent that causes the nuclear change (e.g. a neutron source), it is natural transmutation.

After reading “The Crisis, No. 1,” what do you think Paine means by the line, "These are the times that try men’s souls"? Cite evidence from the text to support your analysis.

Answers

Paine is referring to the difficulties facing the colonists to stand up against the British Empire against imposed taxes and foreign rule. He says "Tyranny, like hell, is not easily conquered; yet we have this consolation with us, that the harder the conflict, the more glorious the triumph". This emphasises his point that the fight is against tyranny, although the battle may be difficult.

Answer:

America was going through a difficult period when Paine wrote "The Crisis, No. 1." Some soldiers were abandoning the fight for freedom, and therefore, Paine tried to convince them through these lines: "These are the times that try men's souls. The summer soldier and the sunshine patriot will, in this crisis, shrink from the service of their country; but he that stands by it now, deserves the love and thanks of man and woman."

Paine agreed that the time was full of troubles and problems, and it was testing the hard work of the people. However, he appealed to them to not abandon the war. He argued that hope was not yet lost, and victory was within reach as long as Americans continued their struggle.

Explanation: answer on plato/edmentum

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