What part of the sun do we see from earth?

Answer:

Can volume alone be used to predict whether an object will sink or float? -No, you need both mass and volume to find its density to see if it can float.

Answer:

a) 226.6 grams of Cl₂

b) 19.2 grams of C

c) 303.2 grams of TiCl₄ and 70.4 grams of CO₂

Explanation:

The balanced chemical reaction is the following:

TiO₂(s) + C(s) + 2 Cl₂(g) → TiCl₄(s) + CO₂(g)

(a) What mass of Cl₂ gas is needed to react with 1.60 mol TiO₂?

From the chemical equation, 1 mol of TiO₂ reacts with 2 moles of Cl₂. So, the stoichiometric ratio is 2 mol Cl₂/1 mol TiO₂. We multiply this ratio by the moles of TiO₂ we have to calculate the moles of Cl₂ we need:

1.60 mol TiO₂ x 2 mol Cl₂/1 mol TiO₂ = 3.2 mol Cl₂

Now, we convert from moles to mass by using the molecular weight (MW) of Cl₂:

MW(Cl₂) = 35.4 g/mol x 2 = 70.8 g/mol

mass of Cl₂= 3.2 mol x 70.8 g/mol = 226.6 g

Therefore, 226.6 grams of Cl₂ are needed to react with 1.6 mol of TiO₂.

(b) What mass of C is needed to react with 1.60 mol of TiO₂?

From the chemical equation, 1 mol of TiO₂ reacts with 1 moles of C(s). So, the stoichiometric ratio is 1 mol C/1 mol TiO₂. We multiply this ratio by the moles of TiO₂ we have to calculate the moles of C(s) we need:

1.60 mol TiO₂ x 1 mol C(s)/1 mol TiO₂ = 1.60 mol C(s)

So, we convert the moles of C(s) to grams as follows:

MW(C) = 12 g/mol

1.60 mol x 12 g/mol = 19.2 g C(s)

Therefore, a mass of 19.2 grams of C is needed to react with 1.60 mol of TiO₂.

(c) What is the mass of all the products formed by reaction with 1.60 mol of TiO₂?

From the chemical equation, we can notice that 1 mol of TiO₂ produces 1 mol of TiCl₄ and 1 mol of CO₂. So, from 1.60 moles of TiO₂, 1 mol of each product will be produced:

1 mol TiO₂/1 mol TiCl₄ ⇒ 1.60 mol TiO₂/1.60 mol TiCl₄

1 mol TiO₂/1 mol CO₂ ⇒ 1.60 mol TiO₂/1.60 mol CO₂

Finally, we convert the moles to grams by using the molecular weight of each compound:

MW(TiCl₄) = 47.9 g/mol Ti + (35.4 g/mol x 4 Cl) = 189.5 g/mol

1.60 mol x 189.5 g/mol = 303.2 g

MW(CO₂) = 12 g/mol C + (16 g/mol x 2 O) = 44 g/mol

1.60 mol x 44 g/mol = 70.4 g

Therefore, from the reaction of 1.60 mol of TiO₂ are formed 303.2 grams of TiCl₄ and 70.4 grams of CO₂.

Answer:

A

Explanation:

The weight of magnesium chloride required to prepare the 200 ml solution that is 5.0 M is approximately 48 grams.

To calculate the weight of magnesium chloride (\(MgCl_{2}\)) required to prepare a 200 ml solution that is 5.0 M, we need to use the formula: Weight (in grams) = Volume (in liters) × Concentration (in moles/liter) × Molecular Weight (in grams/mole)

First, we convert the volume from milliliters to liters by dividing it by 1000: Volume = 200 ml ÷ 1000 = 0.2 L. Next, we multiply the volume, concentration, and molecular weight: Weight = 0.2 L × 5.0 mol/L × 95.3 g/mol = 47.65 grams

Rounding to the nearest whole number, the weight of magnesium chloride required to prepare the 200 ml solution that is 5.0 M is approximately 48 grams.

This calculation ensures that the desired concentration is achieved by accurately measuring the appropriate amount of magnesium chloride, taking into account its molecular weight and the desired volume of the solution.

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The distance of a soccer player who runs the length of the pitch (20m) and then returns to the middle is 30m.

Distance and displacement are two quantities that seem to mean the same but are distinctly different with different meanings and definitions. Distance is the measure of “how much ground an object has covered during its motion” while displacement refers to the measure of “how far out of place is an object.” In this article, let us understand the difference between distance and displacement.

Distance is the total movement of an object without any regard to direction. We can define distance as to how much ground an object has covered despite its starting or ending point.

In the question, The length of full pitch is 20m. So to cover full  pitch one time the distance would be 20m and then the half pitch, the distance would be 10m. Total distance would be 30m.

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The major products formed when benzene reacts with the following reagents are :

(a) tert-butylbenzene

(b) bromobenzene

(c) mixture (ortho-nitrobenzene, meta-nitrobenzene, para-nitrobenzene)

(d) benzaldehyde

(e) nitrobenzene

(a) The major product formed when benzene reacts with tert-butyl bromide and \(AlCl_3\) is tert-butylbenzene.

(b) The major product formed when benzene reacts with bromine and a nail (iron) is bromobenzene.

(c) The major product formed when benzene reacts with iodine and \(HNO_3\) is a mixture of ortho-nitrobenzene, meta-nitrobenzene, and para-nitrobenzene.

(d) The major product formed when benzene reacts with carbon monoxide, HCl, and \(AlCl_3\)/CuCl is benzaldehyde.

(e) The major product formed when benzene reacts with nitric acid and sulfuric acid is nitrobenzene.

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Answer:

The electronic configuration of ions formed are:

Li+ (2) => 1s2

Cl- (18) => 1s2 2s2 2p6 3s2 3p6

Explanation:

Lithium metal, Li will lose 1 electron to lithium ion Li+. Chlorine atom, Cl will receive the 1 electron to form the chloride ion Cl- as shown by the following equation below:

Li —> Li+ + e

Cl+ e —> Cl-

Combine both equation

Li + Cl + e —> Li+ + Cl- + e

Cancel out 'e'

Li + Cl —> Li+ Cl-

Thus, we can write the electronic configuration for the reaction as follow:

Before reaction:

Li (3) => 1s2 2s1

Cl (17) => 1s2 2s2 2p6 3s2 3p5

After reaction

Li+ (2) => 1s2

Cl- (18) => 1s2 2s2 2p6 3s2 3p6

Therefore, the electronic configuration of the ions formed are:

Li+ (2) => 1s2

Cl- (18) => 1s2 2s2 2p6 3s2 3p6

Answer:

2.78035217*10^6 m

Explanation:

C = v

3.0e8 = (107.9)

= 2.78035217*10^6 m

Answer:

One way is that carbon dioxide automatically dissolves in cold ocean surface waters anyway so large bodies of water already have a concentration of carbon dioxide. Another way is when carbon dioxide dissolves in rainwater which later reacts with minerals in rocks. These rocks then get carried away by rivers or streams into bigger bodies of water and the carbon is transported through the minerals in the rocks.

The pressure at which the the gas has a solubility of 2.3 g/L is 93.95 atm

To find the pressure at which the solubility would be 2.3 g/L, we need to use equation for Henry's law, which is written as:

S₁/P₁ = S₂/P₂

Where the variables in that equation are:

We know the values of:

S₁ = 0.086 g/L

P₁ = 3.5 atm

S₂ = 2.3 g/L

Solving the equation for P₂:

S₁/P₁ = S₂/P₂

P₂ = (S₂ * P₁) / S₁

Now evaluate it to get:

P₂ = (2.3 g/L * 3.5 atm) / 0.086 g/L

P₂ = 93.95 atm

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Answer:

Atoms is the smallest unit of a chemical element and consist of three main components protons, neutrons, and electrons.

The number of a neutron is based on the difference between the mass number of the atom (M) and the atomic number (Z). every isotope of an element has a different number of neutron.

But in a neutral atom or average atom, the number of neutrons is equal to the number of protons and the number of electron.

Example of the number of neutrons in an average atom: In Nitrogen-14, the atomic number and the number of protons is 7, it means the number of neutrons will also 7.

Answer:

\(\sf\large\underline\purple{Fractional\: Distillation:-}\)

\(\rightarrow\)The process involves repeated distillations and condensations and the mixture is usually separated into component parts. The separation happens when the mixture is heated at a certain temperature where fractions of the mixture start to vaporize.

\(\rightarrow\)The basic principle of this type of distillation is that different liquids boil and evaporate at different temperatures. So when the mixture is heated, the substance with lower boiling point starts to boil first and convert into vapours.

\(\sf\underline\green{Applications\: Of\:Fractional\: Distillation:-}\)

________________________________

Hope it helps you:)

the mole fraction of \(CH_4\) in the original mixture is 0.73 =  73%.

Total pressure of the mixture = 0.53 atm

Total pressure of the product gases = 2.2 atm

The combustion equation for \(CH_4\) is given as :

\(CH_4\)(g) + \(2O_2\)(g) -> \(CO_2\)(g) + \(2H_2O\)(g)

We then apply  Dalton's law of partial pressures, and write

Pressure of \(CO_2\) + Pressure of \(H_2O\) = Pressure of product

x + Pressure of \(H_2O\) = Pressure of product

x + Pressure of \(H_2O\) = 2.2 atm

the mole fraction and the partial pressure relationship is :

2x = Pressure of \(H_2O\)

x + 2x = 2.2 atm

3x = 2.2 atm

x = 2.2 atm / 3

x = 0.73

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To answer your question, the useful buffering range of phosphoric acid and its conjugate base is approximately between pH 6.21 to 8.21.

This is because the pKa of phosphoric acid is 7.21, which means that at pH values below 6.21, most of the acid will be in its protonated form (H3PO4) and at pH values above 8.21, most of it will be in its deprotonated form (H2PO4-). However, within this buffering range, there will be a relatively equal distribution of both the protonated and deprotonated forms,

which allows for the acid-base pair to act as an effective buffer. The buffer capacity is the highest at pH = pKa and decreases as the pH moves away from pKa. The conjugate base of phosphoric acid is H2PO4-, and it acts as the base in the buffer system. In summary, the useful buffering range of phosphoric acid and its conjugate base is between pH 6.21 to 8.21, which allows for the acid-base pair to act as an effective buffer.

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Answer:

The answer is sodium which is the element is the most reactive.

When we balance this equation

      N₂O₅(s) ⇄ NO₂(g) + O₂(g)

We will get

      2N₂O₅(s) ⇄ 4NO₂(g) + O₂(g)

Balancing this equation

      N₂O₅(s) ⇄ NO₂(g) + O₂(g)

We have to balance the number of N

      N₂O₅(s) ⇄ 2NO₂(g) + O₂(g)

We have to balance the number of O

      2N₂O₅(s) ⇄ 4NO₂(g) + O₂(g)

The balanced equation is

      2N₂O₅(s) ⇄ 4NO₂(g) + O₂(g)

The reaction quotient will be

     Qc = [product] / [reactant]

     Qc ​= [NO₂(g) + O₂(g)] / [ N₂O₅(s)]

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Answer:

700 mL of ethanol would be added

Explanation:

Given data:

Volume of ethanol added to make 40% v/v solution = ?

Total volume of solution = 1750 mL

Solution:

We will calculate the 40% 1750 mL which will be the volume of ethanol added to the water to make 40%v/v solution.

(40/100)× 1750 mL

0.4 × 1750 mL

700 mL

700 mL of ethanol would be added.

Answer:

The shapes of continents fit together like a puzzle.

Explanation:

Just look at the east coast of South America and the west coast of Africa—it's almost a perfect fit! Identical rocks have been found on different continents. These rocks formed millions of years ago before the continents separated.

decay rate of approximately 1.69x10^17 Bq (becquerels),

The decay rate of a radioactive sample is determined by the number  of radioactive atoms present and the decay constant, which represents the probability of decay per unit of time.

To calculate the decay rate, we multiply the number of atoms in the sample by the decay constant. In this case, the sample has 8.31x10^17 atoms and a decay constant of 0.203/s. Multiplying these values gives a decay rate of approximately 1.69x10^17 Bq (becquerels), which represents the number of decays per second in the sample.

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Answer:

I won't say I'm confident with this because I'm not sure if the second one is even correct, but I hope I helped you and didn't make things worse lol.

NaCl is the limiting reactant and 9 moles of NaNO3 is obtained.

9 moles of NaNO3 is obtained, Balanced chemical reaction: Al(NO3)3 + 3NaCl 3NaNO3 + AICI3. From the reaction, it is seen that the limiting reactant yields the least amount of NaNO3.1 mole of Al(NO3)3 yields 3 moles of NaNO3. 4 moles of Al(NO3)3 yields 4 * 3/1 = 12 moles of NaNO3 Also,3 moles of NaCl yields 3 moles of NaNO3, 9 moles of NaCl yields 9 * 3/3 = 9 moles of NaNO3. Hence, NaCl is the limiting reactant and 9 moles of NaNO3 is obtained. The chemical equation is thought to be balanced when there are no inequalities. Every element in this example now has an equatable number of atoms on both the product and reactant sides. A balanced reaction has the same number of items on both sides of the equation. In a chemical reaction, the stoichiometric correlation is the number written in front of atoms, ions, and molecules to balance this same amount of each component on both the reactants and the products sides of the equation.

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The 4s orbitals are filled first because, according to our theory, they have a lower energy than the 3d orbitals. We are aware that the 4s electrons are lost first when an atom ionizes.

The highest energy level electrons that are lost first are those that are most far from the nucleus' influence. A higher energy must therefore exist in the 4s orbital than in the 3d orbitals.

The electron is a subatomic particle with the symbol e or with an electric charge of one elementaryly negative charge. Due to their lack of known components or substructure, electrons, which are part of the first generation of the lepton particle family, are typically considered to be elementary particles.

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Answer:

it is a result of hydrogen bonds present within water molecules.

Explanation:

when the water is transformed to ice at zero degrees Celsius, the water molecules are in crystal lattice in a structure that has a lot of empty space around each molecule.

The correct answer should be larger than implied by part (a) by \(0.0859 \times 10^{(-3)\) u.

The atomic mass (also known as atomic weight) of an element represents the average mass of atoms of that element, taking into account the different isotopes and their abundances. It is typically expressed in atomic mass units (u).

The atomic mass of an element can be found on the periodic

To calculate the mass of the 4He nucleus in atomic mass units (u), we need to subtract the mass of two electrons from that of a neutral 4He atom. Let's proceed with the calculations:

According to Appendix D, the atomic mass of a neutral 4He atom is approximately 4.0026 u. We'll subtract the mass of two electrons to obtain the mass of the nucleus.

The atomic mass of an electron is approximately 0.00054858 u (as listed in Appendix D). Therefore, the mass of two electrons is:

2 * 0.00054858 u = 0.00109716 u

Subtracting this value from the mass of a neutral 4He atom:

4.0026 u - 0.00109716 u = 4.0015 u

This is the mass of the 4He nucleus in atomic mass units according to the incorrect calculation in part (a), which neglected the binding energy of the electrons.

However, we are given that the energy needed to pull both electrons far away from the nucleus is 80 eV. This energy corresponds to the binding energy of the electrons, which contributes to the mass of the system.

To convert 80 eV to atomic mass units (u), we use the conversion factor given in Appendix D: 1 u = 931.5 MeV/c².

80 eV is equal to 80 eV / (931.5 MeV/c²) = \(0.0859 \times 10^{(-3)\) u.

Therefore, the correct answer should be larger than implied by part (a) by \(0.0859 \times 10^{(-3)\) u.

In terms of significant figures, it's important to note that the binding energy of the electrons introduces an uncertainty in the mass calculation. The energy given (80 eV) is only specified to two significant figures. As a result, the mass of the nucleus should also be reported with a similar level of precision to reflect this uncertainty.

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Answer:

mass=279grams

Explanation:

GIVEN DATA

number of atoms=3.01×10^23

avogadro's number=6.022×10^22

molar mass of iron=56g/moles

TO FIND

mass in gram of iron=?

SOLUTION

by using the formula

mass in gram=(number of atoms÷avogdro's number)×molar mass

mass=(3.01×10^23÷6.022×10^23)×56

mass=0.499×56

mass=27.9grams=28 grams

The heat causes the sugar's atoms to combine with the oxygen in the air, forming new groups of atoms. Energy is released in this chemical reaction in the form of smoke and black soot.         hope this helps

Sugar is made of carbon, hydrogen, and oxygen atoms. When heated over a candle, these elements react with the fire to turn into a liquid. The heat causes the sugar's atoms to combine with the oxygen in the air, forming new groups of atoms. Energy is released in this chemical reaction in the form of smoke and black soot.

The density of the gas will decrease as we heat the gas.

Density of a system is defined by mass per unit volume. Density basically describes how compact or concentrated something is. For example, suppose you have two boxes, one is large and one is small. However, they both weigh the same. But we see that  the small box has a higher density than the large box. So, density also tells how concentrated or crowded something is.

Considering the above given case, when  we take a gas sample in a balloon and then when we start to heat this sample, due to hear we can see that the gas molecules will try to move more far from each other and therefor the density of the system will decrease. This same concept is been used in hot air balloons too. When we heat the balloon the density of the gas will decrease and therefor the balloon floats in the air.

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