why is the non-luminous flame preferred for heating?

Answer: B aka #2

Explanation:

The Chemical equation for this reaction is F[tex]_2[/tex](g) + Ca(s) → CaF[tex]_2[/tex]. Therefore, the correct option is option B.

Chemical equations are symbols or chemical formulas that depict a chemical reaction symbolically. With a plus sign separating the entities in the reactants and products, the reactant objects are listed on the left as well as the product objects are listed on the right.

The critical values of a stoichiometric values are shown as coefficients alongside the symbols or formulas of the various entities. Fluorine gas is placed in contact with calcium metal at high temperatures to produce calcium fluoride powder. The formula equation for this reaction is

F[tex]_2[/tex](g) + Ca(s) → CaF[tex]_2[/tex]

Therefore, the correct option is option B.

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Acid rain removes nutrients from soil and Ocean waters become more acidic.

Ocean waters become more acidic when carbon dioxide from the atmosphere dissolves in seawater because the carbondioxide reacts with water produces carbonic acid.

When fossil fuels are burned, they release nitrogen oxides into the atmosphere, which contribute to the formation of smog and acid rain.

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Answer:

How do changes in the atmosphere from burning fossil fuels affect plant life? Select the two correct answers.

-Acid rain removes nutrients from soil.

-Increased ozone levels slow plant growth.

What happens when carbon dioxide from the atmosphere dissolves in seawater?(1 point)

-Ocean waters become more acidic

Which of the following chemicals are pollutants released when people burn fossil fuels? Select the two correct answers.(1 point)

-nitrogen dioxide

-sulfur dioxide

How does the use of fossil fuels affect the cryosphere?(1 point)

-Higher levels of greenhouse gases in the atmosphere cause sea ice to melt.

Why are rising carbon dioxide levels in the atmosphere harmful?(1 point)

-Carbon dioxide traps heat in Earth's atmosphere.

Explanation:

Answer:

hydrochloric acid (HCl)

Explanation:

balanced equation: Ca(OH)2+2HCl -> CaCl2+2H2O

85.0/36=2.33 mol HCl

120/74=1.62 Ca(OH)2

2.33 mol HCl x 1 mol CaCl2/2 mol HCl = 1.165 mol CaCl2

1.62 mol Ca(OH)2 x 2 mol CaCl2/1 mol Ca(OH)2 = 3.24 mol CaCl2

Answer:

Carbohydrates

Explanation:

first of all, I took a quiz and got it right but also Carbohydrates fuel the body and are broken down and made into glucose that can be absorbed into the bloodstream. so when absorbed into the bloodstream they travel in the blood to the body's cells where they are used for respiration.

Answer:

Explanation:

To find the molarity, we have an equation: moles ÷ liter.

To find the moles of NaF, take the gram ÷ molar mass of NaF

7.13/42.0 = 0.170 moles of NaF

201 ml ÷ 1000 = 0.201L

Taking into account the Charles's law, to 94.36 K or -178.64 °C must a sample of helium gas be cooled from 139ºC to reduce its volume from 3.1 L to 0.71 L at constant pressure.

This law states that the volume is directly proportional to the temperature of the gas: for a given sum of gas at constant pressure, as the temperature increases, the volume of the gas increases, and as the temperature decreases, the volume of the gas decreases.

In summary, Charles' law is a law that says that when the amount of gas and pressure are kept constant, the ratio between volume and temperature will always have the same value:

[tex]\frac{V}{T} =k[/tex]

Studying two different states, an initial state 1 and a final state 2, it is satisfied:

[tex]\frac{V1}{T1} =\frac{V2}{T2}[/tex]

In this case, you know:

Replacing in Charles's law:

[tex]\frac{3.1 L}{412 K} =\frac{0.71 L}{T2}[/tex]

Solving:

[tex]\frac{3.1 L}{412 K} T2=0.71 L[/tex]

[tex]T2 =\frac{0.71 L}{\frac{3.1 L}{412 K}}[/tex]

T2= 94.36 K= -178.64 °C

Finally, to 94.36 K or -178.64 °C must a sample of helium gas be cooled from 139ºC to reduce its volume from 3.1 L to 0.71 L at constant pressure.

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Based on the equation of the reaction, nitrogen is the limiting reagent while hydrogen is the excess reagent.

Hydrogen and nitrogen combines to form ammonia ina mole ratio of 3 : 1 as shown by the equation of the reaction below:

The number of moles of the reactants in 14g of Nitrogen gas and 8.0g of hydrogen is calculated as follows:

Molar mass of N_{2} = 14.0 g

Molar mass of H_{2} = 2.0 g

Moles of N_{2} = 14/14.0 = 1 mole

Moles of H_{2} = 8/2.0 = 4 moles

Based on the data above:

Therefore, the limiting reagent is nitrogen while hydrogen is the excess reagent.

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Based on the energy usage shown by the graph, the best option for the chemical change represented is the combustion of iron.

The combustion of iron in oxygen leads to the formation of Iron (III) oxide in solid form.

For the combustion of iron to happen, a lot of heat has to be applied to the iron which is why the potential energy of reactants is high. As the reaction progresses, the energy needed reduces as iron (III) oxide is formed.

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Entropy is commonly understood as the system's degree of disorder or unpredictability. The correct option is, (C) (iii) only

Entropy is a thermodynamic number that represents the inability of a system's thermal energy to be converted into mechanical work and is commonly understood as the system's degree of disorder or unpredictability.

The degree of unpredictability of a molecule rises when it transitions from a solid to a liquid state. As a result, the entropy will rise.

Similarly, when we move from a liquid to a gaseous state, the unpredictability of the molecule increases. As a result, the entropy will rise.

However, as we progress from gas to liquid to solid, the degree of molecular randomization reduces. As a result, the entropy will decrease.

Or, to put it another way, the higher the number of moles in a product, the higher the entropy.

(i) [tex]N_2(g)+3H_2(g) \rightarrow 2NH_3(g)[/tex]

Entropy falls in this reaction because the number of moles on the product side is fewer than the number of moles on the reactant side.

(ii) [tex]C_{10}H_8(g) \rightarrow C_{10}H_8(s)[/tex]

Entropy lowers in this process because the degree of randomness of the molecules diminishes as we move from a gas to a solid-state.

(iii) [tex]CH_3OH(l)\rightarrow CH_3OH(aq)[/tex]

Because the methanol liquid dissociated into ions, the number of moles present on the product side is more than the number of moles present on the reactant side, entropy rises in this reaction.

Hence, the correct option is, (C) (iii) only.

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Mass defect for oxygen-16 = 0. 13261 amu, in the kilograms the mass defect equals to 2.20 × 10⁻²⁸ kg.

Mass defect is the difference between the mass of of an whole atom and the combined mass of its individual particles present in that atom.

We know that, 1 amu = 1.6 × 10⁻²⁷ kg

Given that, mass defect for oxygen-16 = 0.13261 amu

To calculate this defect in terms of kilograms, we have to convert into kg unit as:

0.13261 amu = 0.13261 amu × 1.6 × 10⁻²⁷ kg/amu

0.13261 amu = 2.20 × 10⁻²⁸ kg

Hence option (2) is correct.

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Answer:

answer is nitrogen dioxide

Addition of sodium carbonate is a way to soften water by removing calcium ions

Water can be softened by the addition of lime to precipitate the calcium as carbonate. Sodium carbonate is also added to remove the remaining calcium salts and to make the water soft.

So we can conclude that addition of lime or sodium carbonate is a way to soften water by removing calcium ions.

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A process based on ksp experiment to soften the water by removing calcium ions is by ion exchange resin process in which the calcium ion is substituted by a sodium ion.

The water containing a large number of calcium ions is called hard water.

Hard water is not suitable to use.

To remove calcium ion or soften the water, there are various methods are used.

They are ion exchange resin, distillation, and sodium hydroxide.

Thus, a process based on ksp experiment to soften the water by removing calcium ions is by ion exchange resin process in which the calcium ion is substituted by a sodium ion.

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The volume of the soft drink solution in milliliters that contains 102.5 g of sucrose is 11.93mL.

The volume of a solution can be calculated by dividing the mass by the density. That is;

Volume = mass/density

According to this question, a soft drink contains 12.1% sucrose (C12H22O11) by mass. This means that the mass of the sucrose is

12.1/100 × 102.5 = 12.40g of sucrose

Volume = 12.40g ÷ 1.04g/mL

Volume = 11.93mL

Therefore, the volume of the soft drink solution in milliliters that contains 102.5 g of sucrose is 11.93mL.

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Answer:

no, food is not a fuel because it just give energy to do many activities but it will not provide any fuel only the dead and decaying material which berries under the soil then after a long years it becomes fossil fuel

Answer:

The electron arrangement of the outer energy level of an atom determines whether or not it will form chemical bonds.

Explanation:

Yes, we can dissolve 35 moles of KMnO₄ into 500 mL of water to give a molarity of 70 M

Molarity is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:

Molarity = mole / Volume

Molarity = mole / Volume

Molarity = 35 / 0.5

Molarity = 70 M

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We can not dissolve 35 moles of potassium permanganate into 500 ml of water as it produces the solution with higher molarity than water have.

Molarity of any solution is define as the number of moles of solute present in per liter of the solvent as:

M = n/V

The molarity of the solvent, water, is the highest for aqueous solutions and molarity of 1000g of pure water in 1 liter is 55.5M

Given that,

On putting values, we get

M = 35/0.5 = 70M

Preparation of this solution is impossible.

Hence, KMnO₄ will not dissolve in the water as it produces solution with higher molarity than water.

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Answer:

3.0 atm

Explanation:

got it right on edge after guessing 2 times

The resulting pressure of the gas after decreasing the initial volume is 3 atm.

According to the Boyle's Law at constant temperature, pressure of the gas is inversely proportional to the volume of the gas:

P ∝ 1/V

For the given question required equation is:

P₁V₁ = P₂V₂, where

P₁ = initial pressure = 1.5 atm

V₁ = initial volume = 2 L

P₂ = final pressure = ?

V₂ = final volume = 1 L

On putting all these values on the above equation, we get

P₂ = (1.5)(2) / (1) = 3atm

Hence required pressure is 3 atm.

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Answer:

Diffraction involves a change in direction of waves as they pass through an opening or around a barrier in their path.

Reflection involves a change in direction of waves when they bounce off a barrier; refraction of waves involves a change in the direction of waves as they pass from one medium to another

Explanation:

If we use water waves as an example, waves hitting shallower water at an angle will slow down and change direction slightly. That is refraction

Waves hitting an island will bend and eventually close in on the "shadow" of the island. That is diffraction

The current required to plate out 2.96 g of nickel from the solution of Ni²⁺ in 27.12 minutes is 5.95 A

We'll begin by writing the balanced equation showing the number of faraday required to plate nickel. This is given below

Ni²⁺ + 2e —> Ni

Molar mass of Ni = 59 g/mol

Mass of Ni from the balanced equation = 1 × 59 = 59 g

Number of faraday = 2 F

1 faraday = 96500 C

2 faraday = 2 × 96500 = 193000 C

SUMMARY

From the balanced equation above,

59 g of Nickel was deposited by 193000 C of electricity

From the balanced equation above,

59 g of Nickel was deposited by 193000 C of electricity

Therefore,

2.96 g of Nickel will be deposited by = (2.96 × 193000) / 59 = 9682.71 C of electricity

I = Q / t

I = 9682.71 / 1627.2

I = 5.95 A

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The current required to plate out 2. 96 g of nickel from a solution of ni2 in 27. 12 minutes is 5.95 ampere.

Current is a charged particle moving through an electrical conductor.

The equation is [tex]\rm Ni^2^+ + 2e = Ni[/tex]

step 1: calculate the mass of Ni

Molar mass of Ni is 59 g/mol

59 × 1 = 59 g

Step2: calculate the number of Faraday

no. of Faraday is 2F

1 Faraday = 96500 C

then, 2 Faraday is equal to 2 × 96500 = 193000 C

Step 3: calculate the quantity of electricity

59 g of Nickel is deposited by, 193000 C of electricity

So, for 2.96 g of nickel

[tex]\dfrac{2. 96\;g \times 193000}{59} = 9682.71 \;C[/tex]

Step4: calculate the current:

Electricity Q = 9682.71 C

Time = [tex]27.12 \times 60 = 1627.2 \;s[/tex]

To find current

[tex]I = \dfrac{Q}{t} \\\\I = \dfrac{9682.71 }{1627.2}\\I = 5.95 A[/tex]

Thus, the current required is 5.95 ampere.

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Answer: A “rate” is a measure of the speed of any change that occurs within an interval of time In chemistry, reaction rate is expressed as the amount of reactant changing per unit time. Example: 3 moles/year, or 5 grams/second

Explanation: A “rate” is a measure of the speed of any change that occurs within an interval of time In chemistry, reaction rate is expressed as the amount of reactant changing per unit time. Example: 3 moles/year, or 5 grams/second

Answer:

Chemical reaction rates are usually expressed as the concentration of reactant consumed or, the concentration of product formed per unit time.

Explanation:

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Answer:

a transverse electric wave and a magnetic transverse wave that are perpendicular and are moving in the same direction.

Explanation:

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Given the pressure in KPa, the value of the pressure reading in torr obtained is 20.73 torr

101.325 KPa = 760 torr

The value of the pressure in torr can be obtained as illustrated below:

101.325 KPa = 760 torr

Therefore,

2.76324 KPa = (2.76324 × 760) / 101.325

2.76324 KPa = 20.73 torr

Thus, 2.76324 KPa is equivalent to 20.73 torr

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The two step synthesis 2‑hydroxy‑2,4‑dimethyl pentanoic acid of involves compounds as represented in the attached image.

From the task content:

It therefore follows that the Starting compound A and intermediate compound B are as represented in the attached image.

Remarks: The reagents provided are, H3O, Potassium cyanide and Hydrogen cyanide.

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Answer:

Specific chemical sugar glucose

Explanation:

When we say “blood sugar,” we mean the specific chemical sugar glucose. Diabetes is all about glucose. There lots of sugars….table sugar is sucrose, malt sugar is maltose, milk sugar is lactose, and you’ve probably heard of fructose.

Blood sugar, or glucose, is the main sugar found in your blood. It comes from the food you eat, and is your body's main source of energy. Your blood carries glucose to all of your body's cells to use for energy.

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Larger differences in air pressure over a small area makes the wind blow faster and stronger.

Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.

There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .

It is a scalar quantity which is related to the vector area element with a normal force acting on it.It is distributed over solid boundaries and across arbitary sections of fluid normal to the boundaries at every point.

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Answer:

The answer is B which is 40

From the calculations and the data presented, the total volume in the flask is 100cm^3

A neutralization occurs between an acid and a base to yiled salt and water only.

The reaction equation here is; HCl + NaOH -----> NaCl + H2O. Now, the volume of HCl used is obtained from;

2 * 20 * 1/0.5 * 1 = 80 cm^3

Total volume in the flask =  80 cm^3 + 20cm3 = 100cm^3

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