Tutorial queshers Set 1
| Why does molecule become a chiral if has a Plane of symmetry even through it has stereocenter​

Ph = - Log (Hcl)

= - Log (0.00750)

= 2.12

Ph = 2.12

Answer: pH = 2.12

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration and pOH is calculated by taking negative logarithm of hydroxide ion concentration.

[tex]pH=-\log [H^+][/tex]

[tex]pOH=-log{OH^-}[/tex]

[tex]pH+pOH=14[/tex]

Give :[tex][H^+][/tex] = 0.00750

[tex]pH=-log[0.00750][/tex]

[tex]pH=2.12[/tex]

The chemical symbols for three different atomic cations that all have 13 protons:-

[tex]Al^{+1} ,Al^{+2} ,Al^{+3} [/tex]

Atomic number:-

The atomic number defines the number of protons in an atom.

Atomic cations are [tex]Al^{+1} ,Al^{+2} ,Al^{+3} [/tex]

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Answer:

492.3 cm³.

Explanation:

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

(V₁T₂) = (V₂T₁).

V₁ = 417.0 cm³, T₁ = 65°C + 273 = 338 K.

V₂ = ??? cm³, T₂ = 126°C + 273 = 399 K.

∴ V₂ = (V₁T₂)/(T₁) = (417.0 cm³)(399 K)/(338 K) = 492.3 cm³.

Answer:

492.3 cm³.

Explanation:

Answer:

26.3°C.

Explanation:

Q = m.c.ΔT,

where, Q is the amount of heat absorbed by copper (Q = 1000 J).

m is the mass of the copper (m 2000 g).

c is the specific heat of copper (c = 0.385 J/°C.g).

ΔT is the difference between the initial and final temperature (ΔT = final T - initial T = final T - 25°C).

∵ Q = m.c.ΔT

∴ (1000 J) = (2000 g)(0.385 J/°C.g)(final T - 25°C)

∴ (final T - 25°C) = (1000 J)/(2000 g)(0.385 J/°C.g) = 1.299.

∴ final T = 25°C + 1.299 = 26.299°C ≅ 26.3°C.

Answer:

Deforestation due as a result of development

Explanation:

As economies advance the need for more space to put up more infrastructure increases. This leads to the clearing of forests leaving widespread bare lands as the one shown in the picture provided, that have the long term effect of desertification.  

The frozen balloon shrank because the average kinetic energy of the gas molecules in a balloon decreases when the temperature decreases. This makes the molecules move more slowly and have less frequent and weaker collisions with the inside wall of the balloon, which causes the balloon to shrink a little.

Answer:

c

Explanation:

Answer:

I want to say the answer is B

Explanation:

Answer:

Hi there!

The answer that best fits is B: Energy is continuously added for the chemical reactions to take place.

Explanation:

Endothermic means energy GOING IN not releasing.

Answer: The correct answer is Option B.

Explanation:

Endothermic reactions are defined as the reactions in which energy is absorbed by the system. The total enthalpy of the reaction comes out to be positive.

Exothermic reactions are defined as the reactions in which energy is released by the system. The total enthalpy of the reaction comes out to be negative.

Cooking is a type of endothermic reaction because in this process, energy is given to the uncooked food continuously. Energy is getting absorbed by the food for the chemical reactions to take place.

Thus, the correct answer is Option B.

Answer:

It is difficult to safely transport and store hydrogen gas before it is used.

Explanation:

A mixture of hydrogen gas and oxygen causes an explosive reaction. Any minimal leak would mean a fire hazard. If it was in a series of storage equipment, a single explosion would lead to a series of other explosions that would lead to a massive loss of property and possibly, life.

Answer:

Widespread use of fuel cell vehicles poses a danger because

it is difficult to safely transport and store hydrogen gas before it is used.

Explanation:

A furl cell is used in a fuel cell vehicle instead of a battery.

By the use of Oxygen and compressed hydrogen electricity is generated to give power to the motor. The transportation and the process of storing hydrogen create pollutants.  The primary energy which helps in the production of hydrogen is the main aspect on which the impact of the fuel cell depends upon.

Answer:

12.07 g.

Explanation:

2NH₃(g) + CO₂(g) → H₂NCONH₂(g) + H₂O(g),

It is clear that 2.0 moles of NH₃ react with 1.0 mole of CO₂ to produce 1.0 mole of H₂NCONH₂ and 1.0 moles of H₂O.

At STP, 9.0 L of NH₃ react with an excess of CO₂ gas:

It is known that at STP: every 1.0 mol of any gas occupies 22.4 L.

using cross multiplication:

1.0 mol of NH₃ represents → 22.4 L.

??? mol of NH₃ represents → 9.0 L.

∴ 9.0 L of NH₃ represents = (1.0 mol)(9.0 L)/(22.4 L) = 0.4018 mol.

Using cross multiplication:

2.0 mol of NH₃ produce → 1.0 mol of H₂NCONH₂, from stichiometry.

0.4018 mol of NH₃ produce → ??? mol of H₂NCONH₂.

∴ The no. of moles of H₂NCONH₂ = (1.0 mol)(0.4018 mol)/(2.0 mol) = 0.201 mol.

mass = n * molar mass = (0.201 mol) * (60.06 g/mol) = 12.07 g.

The mass of urea produced from 9.0 litres of ammonia is 12.227 grams.

To solve this problem, we need to follow these steps:

1. Write down the balanced chemical equation:

[tex]\[ 2NH_3(g) + CO_2(g) \rightarrow H_2NCONH_2(g) + H_2O(g) \][/tex]

2. Calculate the molar mass of ammonia[tex](\( NH_3 \))[/tex]:

- The atomic mass of nitrogen (N) is approximately 14.01 g/mol.

- The atomic mass of hydrogen (H) is approximately 1.008 g/mol.

- Since there are 3 hydrogen atoms in ammonia, the total atomic mass for hydrogen is ([tex]\( 3 \times 1.008 \)[/tex]) g/mol.

- The molar mass of ammonia is  [tex]\( 14.01 + (3 \times 1.008) \)[/tex]  g/mol.

3. Convert the volume of ammonia to moles:

- The density of ammonia gas at standard conditions is approximately 0.771 g/L.

- Convert the volume of ammonia from litres to grams using the density.

- Then, convert grams of ammonia to moles using the molar mass calculated in step 2.

4. Use the stoichiometry of the balanced equation to find the moles of urea[tex](\( H_2NCONH_2 \))[/tex]produced:

- According to the balanced equation, 2 moles of ammonia produce 1 mole of urea.

- Therefore, the moles of urea produced will be half the moles of ammonia.

5. Calculate the molar mass of urea [tex](\( H_2NCONH_2 \))[/tex]:

- The molar mass of urea can be calculated by adding the atomic masses of the constituent atoms.

- Urea consists of 2 nitrogen atoms, 4 hydrogen atoms, 1 carbon atom, and 1 oxygen atom.

6. Convert the moles of urea to grams:

- Multiply the moles of urea by its molar mass to get the mass in grams.

Now, let's perform the calculations:

1. Molar mass of [tex]\( NH_3 \):[/tex]

[tex]\[ \text{Molar mass of } NH_3 = 14.01 + (3 \times 1.008) = 17.034 \text{ g/mol} \][/tex]

2. Mass of 9.0 liters of ammonia:

[tex]\[ \text{Mass of } NH_3 = 9.0 \text{ L} \times 0.771 \text{ g/L} = 6.939 \text{ g} \][/tex]

3. Moles of ammonia:

[tex]\[ \text{Moles of } NH_3 = \frac{6.939 \text{ g}}{17.034 \text{ g/mol}} \approx 0.4073 \text{ mol} \][/tex]

4. Moles of urea produced:

[tex]\[ \text{Moles of urea} = \frac{0.4073 \text{ mol}}{2} \approx 0.20365 \text{ mol} \][/tex]

5. Molar mass of urea[tex](\( H_2NCONH_2 \))[/tex]:

[tex]\[ \text{Molar mass of urea} = 2 \times 14.01 + 4 \times 1.008 + 12.01 + 16.00 = 60.062 \text{ g/mol} \][/tex]

6. Mass of urea produced:

[tex]\[ \text{Mass of urea} = 0.20365 \text{ mol} \times 60.062 \text{ g/mol} \approx 12.227 \text{ g} \][/tex]

 Therefore, the mass of urea produced from 9.0 litres of ammonia is approximately 12.227 grams.

 The correct answer is [tex]\boxed{12.227 \text{ g}}.[/tex]

The complete question is:

What mass of urea is produced from 9.0 litres of ammonia?

The given reaction is  [tex]2NH_3(g) + CO_2(g) = H_2NCONH_2(g) + H_2O(g)[/tex]

Answer:

It depends what are the choices that are given.

Answer:

Explanation:

Which sentence is a scientific statement?

A. Long hair looks better than short hair.

B. Brick structures insulate better than wooden structures.

C. Milkshakes should always be sweetened with honey.

D. There is a large, apelike creature living in the Himalayas.

If the volume increases then the pressure would decrease.

Answer:  So if the volume increases, the pressure decreases. ... Boyle's law states that for a fixed amount of gas in an enclosed system at constant temperature, pressure and volume are inversely proportional

Explanation:

This linear relationship between pressure and volume means doubling the volume of a given mass of gas decreases its pressure by half.

PV = c

or

P ∝ 1/V

Answer: D. an open series circuit

Answer:

4800 times does Maria wink every  day.

Explanation:

Number of time Maria winks= 5 times in minute = 5 winks/min

Number of hours she sleeps in day = 8 hours

1 day = 24 hours

Number of hours when Maria is not sleeping = 24 hour - 8 hour = 16 hours

1 hour = 60 minutes

16 hours = 16 × 60 min = 960 min

number of winks in 960  minutes:

[tex]960 min\times 5 winks/min=4800 winks[/tex]

4800 times does Maria wink every  day.

She winks 192 times every day.

This is just basic arithmetic.

In a day, we have 24 hours.

Now, 60 minutes make an hour.

Thus,

Number of minutes in a day = 60 × 24 = 1440 minutes

She sleeps 8 hours a day.

This is same as; 8 × 60 = 480 minutes

Thus, total time she is awake in a day = 1440 - 480 = 960 minutes

She winks every 5 minutes.

Thus, number of winks = 960/5 = 192 winks

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Answer:

A. 6

Explanation:

369 132 000 s

The important rules are

• Digits other than zero are significant

• Trailing zeroes before the decimal point are not significant

The decimal point is after the last zero, so the three zeroes are not significant,

Thus, the underlined digits in 369 132 000 are significant.

There are six significant figures in the measurement.

A. 6

is the answer for this problem

Answer:

Option C= several cm of lead.

Explanation:

we know there are three types of radiations emit by the atoms to attain the stability. These three radiations are alpha, beta  and gamma. Gamma radiations are high energy radiations. These radiations are travel at the speed of light. Gamma radiations can penetrate into the many materials. These radiations are also used to treat the cancer.

These radiations can not be stopped by the single sheet of paper or the water. Lead is used for the protection  against gamma radiations because of its high molecular density. The lead apron are used by the person when treated with gamma radiations. Lead shields are also used in the wall, windows and doors of the room where gamma radiations are treated, in-order to protect the surroundings. While the sheet of aluminium is used to block the beta radiations.

Answer: cm of lead

Explanation: gradpoint (aluminum only stops alpha and beta)

The answer is:

the molarity = 50 moles/liters

The explanation:

when the molarity is = the number of moles / volume per liters.

and when the number of moles =2.5 moles

and the volume per liters = 0.05 L

so by substitution:

the molarity = 2.5moles/0.05L

                    = 50 moles /L

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Answer:

chemical and nuclear reaction

Explanation:

Answer: Option (D) is the correct answer.

Explanation:

A chemical reaction is defined as a reaction that involves exchange of electrons between the combining atoms. Not every chemical reaction releases or absorbs a very large amount of energy per atom.

On the other hand, a reaction that involves change in atomic nuclei of an atom either by splitting or combining of two atomic nuclei is known as a nuclear reaction.

For example, [tex]^{2}_{1}H + ^{3}_{1}H \rightarrow ^{4}_{2}He + ^{1}_{0}n + Energy[/tex]

Nuclear fission is a reaction in which a large nucleus splits by absorption of energy into two atomic nuclei. Nuclear fusion is a reaction in which two atomic nuclei combine together to result in the formation of a large atomic nuclei along with release of energy.

Each nuclear reaction releases or absorbs a very large amount of energy per atom.

Therefore, we can conclude that each nuclear reaction​ releases or absorbs a very large amount of energy per atom.  

Answer:

2.2 × 10^24 molecules

Explanation:

First of all, we need to know the molar mass of chlorine which can be found by using its atomic mass.

molar mass of Chlorine ([tex]Cl_2[/tex]) = [tex]35.453 \times 2[/tex] = 70.906 g/mol

It means that one mole of Chlorine has a mass of 70.906 g.

Number of moles present in 257 grams sample = [tex]\frac{257}{70.906}[/tex] = 3.62 moles

We know that, [tex]1mol = 6.022 \times 10^{23}[/tex]

So we will multiply the number of moles present in 257 grams of Chlorine with this number to find the number of molecules.

Number of molecules in 257 grams of Chlorine = [tex]3.62 \times 6.022 \times 10^{23}[/tex] = 2.2 × 10^24 molecules

If a pond is located in an area with significant amounts of air pollution then pH would be most directly affected.

The term pH is a measurement that indicates the acids and bases of a particular solution.

In conclusion, if a pond is located in an area with significant amounts of air pollution then pH would be most directly affected.

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here is the answer:

if we take the molecular formula, then

28 g Nitrogen forms 17 g ammoni.

so, 11 g Nitrogen forms 17/28 × 11=6.67 g ammonia.

Hence 6.67 g NH3 is formed by 11 g N2

Answer:

13.35 grams of NH₃ is made if 11 grams of N₂ are used.

Explanation:

First of all you should know that the balanced reaction is:

N₂(g) + 3 H₂-> 2 NH₃(g)

Then, it is possible to determine the mass of each compound that reacts or is produced in the reaction by knowing the atomic mass of each element:

Then:

By reaction stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction) you can see that they react or are obtained in moles:

Then, by the reaction stoichiometry of the reaction, you can see the amounts of mass that react or are obtained:

To calculate the amount of NH₃ mass produced if 11 grams of N₂ are used, it is possible to use a rule of three knowing the stoichiometry of the reaction. The rule of three used is the following: if 28 grams of N₂ produce 34 grams of NH₃, 11 grams of N₂ how many grams of NH₃ will they produce?

[tex]gramsofNH_{3} =\frac{11gramsofN_{2} *34gramsofNH_{3} }{28 grams of N_{2} }[/tex]

grams of NH₃=13.35

Then, 13.35 grams of NH₃ is made if 11 grams of N₂ are used.

Answer: propanal and propanoic acid

Explanation: first of all Oxidation of alcohol with mild oxidizing reagent PCC gives Carbonyl compounds and with strong oxidizing agent like CrO3 and kmno4 gives carboxylic acids.

And primary alcohol gives Aldehyde with mild oxidizing reagent and carboxylic acids with strong oxidizing agent.

And ketone is formed with secondary alcohol by both mild and strong Oxidizing agent.

Here our compound is primary alcohol hence we will get propanal and propanoic acid depending on type of Oxidizing agent

Answer:

propanoic acid

Explanation:

One of the properties of alkanols is the fact that they can be oxidized to various products depending on the structure of the alkanol.

A primary alkanol (such as 1-propanol) is oxidized to an alkanal and subsequently to an alkanoic acid.

A secondary alkanol is oxidized to an alkanone while a tertiary alkanol is not oxidized.

This implies that the final product of the oxidation of 1-propanol is propanoic acid as shown in the answer.

Answer:

2.448 M ≅ 2.45 M.

Explanation:

Molarity (M) is the no. of moles of solute that dissolved in 1.0 L of the solution.

M = (no. of moles of solute)/(V of the solution (L).

M = (mass/molar mass) Li₂S / (V of the solution (L))

∴ M of Li₂S = (500.0 g/46.4 g/mol)/(4.44 L) = 2.448 M ≅ 2.45 M.

Answer:

The molarity of 500.0 grams of Li₂S in a total volume of 4.44 liters is 2.448 [tex]\frac{moles}{liter}[/tex]

Explanation:

Molarity (M) is the number of moles of solute (substance that dissolves in a solvent with which it forms a solution, is in a smaller proportion) that are dissolved in a given volume.

Molarity is expressed by the following expression:

[tex]M=\frac{number of moles of solute}{ volume of solution}[/tex]

Molarity is expressed in units [tex]\frac{moles}{liter}[/tex]

Then, you must first know the amount of moles that represent the 500 g of Li₂S. For that, a rule of three is applied knowing the molar mass: if 46 g is 1 mol of Li₂S, 500 g of the compound, how many moles are they?

[tex]moles=\frac{500 g*1mole}{46 g}[/tex]

moles≅10.87

It is now possible to calculate molarity by applying the definition:

[tex]M=\frac{10.87 moles}{4.44 L}[/tex]

M= 2.448 [tex]\frac{moles}{liter}[/tex]

The molarity of 500.0 grams of Li₂S in a total volume of 4.44 liters is 2.448 [tex]\frac{moles}{liter}[/tex]

Answer:

0.5667 M ≅ 0.57 M.

Explanation:

(MV) before dilution = (MV) after dilution.

M before dilution = 1.5 M, V before dilution = 340 mL.

M after dilution = ??? M, V after dilution = 340 mL + 560 mL = 900 mL.

∴ M after dilution = (MV) before dilution/(V) after dilution = (1.5 M)(340 mL)/(900 mL) = 0.5667 M ≅ 0.57 M.

The answer is in the photo.

Answer:

3.56 %

Explanation:

Percent composition of NaCl =  [tex]\frac{mass of NaCl}{mass of sea water  }[/tex] x 100

Mass of sea water = 520 g  

Moles of NaCl = 0.317  mol

Molar mass of NaCl = 58.44 g/mol

Mass of NaCl = moles of NaCl x Molar mass of NaCl  

                       =   0.317  mol x 58.44 g/mol  = 18.52 g

Percent composition of NaCl = [tex]\frac{18.52 g}{520 g}[/tex]  x 100 = 3.56 %

Answer:

2 C₈H₁₈ + 25 O₂ → 16 CO₂ + 18 H₂O.

Explanation:

2 C₈H₁₈ + 25 O₂ → 16 CO₂ + 18 H₂O.

1.0 mole of octane is combusted completely with 25.0 mole of O₂ to produce 16.0 mole of CO₂ and 18.0 mole of H₂O.

Answer:

1s22s22p63s1 is the electronic configuration of sodium.

Explanation:

There are 11 electrons in Sodium ( find this on the periodic table).

Then you need to arrange the electrons in the orbitals around the nucleus.

The structure would be written as A. 1s^22s^22p^63s^1

Answer:

The movement of electrons creates an electric current.

Explanation:

Batteries are electrochemical cells which are devices in which chemical reactions produce an electric current, that is, devices for converting chemical energy into electrical energy.

The reactions involved here are spontaneous redox reactions hence an electric current flows on its own in the external circuit.

In such reactions, there is an electronic movement which creates a potential difference between the two electrodes thereby generating a flow of an electric current in the external circuit. The current flows in the opposite direction to the electronic movement due to chemical reactions.

The flow of the electric current results in an the production of electrical energy while the electronic movement instigates a chemical energy.

Answer:

There's no one-upping that one so I'll just tell you that it was right on my test :)

Explanation:

you're welcome

Answer:

 0.1648

Explanation:

The specific heat of a metal measures the amount of heat energy required to raise its temperature. It is measured in cal/g.°C and varies depending on the type of metal.

The specific heat of a metal is a property that measures the amount of heat energy required to raise the temperature of a certain amount of the metal by a certain number of degrees Celsius. It is typically measured in units of cal/g.°C.

For example, let's say we have a metal with a specific heat of 0.5 cal/g.°C. This means that it takes 0.5 calories of heat energy to raise the temperature of 1 gram of the metal by 1 degree Celsius.

Specific heat can vary depending on the type of metal. Different metals have different atomic structures, which affect how they absorb and retain heat. Therefore, each metal has its own specific heat value.

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Answer:

tetra-.

Explanation:

” mono-” indicates one,

“di-” indicates two,

“tri-” is three,

“tetra-” is four,

“penta-” is five,

“hexa-” is six,

“hepta-” is seven,

“octo-” is eight,

“nona-” is nine,

and “deca” is ten.

So, the right choice is: tetra-.