Which type of energy produces almost no waste or pollution?

A: burning coal

B: nuclear energy

C: solar energy

Answer:

It is an Alkaline Earth Metal

Explanation:

Metallic bonding results from the delocalization of electrons from the parent metal atom so that positive ions are conceived to swim in a sea of electrons. This view of metallic bonding accounts for the malleability, and ductility of metals, as well as their properties of thermal and electrical conduction.

Answer:

See explanation

Explanation:

(a) The handspan is the distance between the tip of the thumb and tip of the little finger when the hand is fully stretched.

b) It is impossible for them to obtain an accurate result by the use of a handspan because it doesn't use any standard unit for measurement. It is entirely subjective and highly prone to human errors.

c) Anupam  is quite intelligent and active

a) A handspan refers to the actual distance between the tip of the thumb

and tip of the little or last finger when the hand is fully stretched. It is

sometimes used in taking measurements of an object.

b) Anupam ask both of them to use measuring tape because the use of

handspan in taking measurement  because:

c) Cubit can't be used as a standard unit of length because it varies in

individuals and is associated with the different heights present.

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Answer: electrical energy

Explanation:

According to law of conservation of energy, energy remains conserved. It only transforms from one form to another.

Chemical energy is the energy stored in the bonds of molecules.

Electrical energy is the energy possessed by a body by virtue of movement of electrons.

Thus when When electricity is produced from coal the chemical energy in coal is changed to electrical energy

Answer:

C : Television

Explanation:

We should click on button from where the wire gets connected to the tv and operate. TV needs electric conductor for the flow of current .

Answer:

true the coefficient of oxygen is 2

Answer:

Explanation:

True

Answer:

True

Explanation:

Hope this isnt too late

Explanation: 5.6g

the molars of FeCl3 is [tex]\frac{16,25}{56+35,5.3}= 0.1[/tex] (mol)

have:

2Fe + 3Cl2  ⇒ 2FeCl3

 0.1 <=                   0.1

=> the molars of Fe is 0.1 mol

=> the mass of Fe is 0,1.56 = 5.6 (g)

The mass of iron required to make 16.25g of iron chloride is 5.59 g.

A limiting reagent can be defined as a reactant that is fully exhausted from the reaction mixture at the completion of a reaction.

When reactants are not taken in stoichiometric quantities, the limiting reactant will decide the amount of product will be formed in a reaction from the reactants.

Given, a balanced chemical equation of the reaction between iron and chlorine is:

2Fe + 3Cl₂ → 2FeCl₃

Given, the amount of iron chloride = 16.25 g

The molecular mass of the iron chloride = 162.2 g/mol

The number of moles of iron oxide = 16.25/162.2 = 0.10 mol

2 moles of iron chloride produced from iron = 2mol

0.10 mol of iron chloride produced from iron =  0.10 mol

The mass of the iron required = 0.10 × 55.85 = 5.59 g

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*sorry I can't give a full explanation.*

g = 9.8 m/s²

w = m*g

Weight of cat: 55 N = m*9.8

m = 5.61 kg

Weight of dog: 110 N = m*9.8

m = 11.22 kg

There is gravitational potential energy (GPE) acting on the cat since it's at the very top.

GPE of cat = m*g*h = 5.61*9.8*2 = 109.96 J

GPE of dog = m*g*h = 11.22*9.8*0 = 0 J (it's 0 m height because it's on the floor instead of in the tree)

But, if the dog was also 2 m up in the tree, its GPE would be 219.91 J.

As you can see, it's GRAVITATIONAL potential energy is bigger than the cat because it weighs more. Generally, if you were just trying to find the force which is w = m*g (since weight is a force), you would see that the bigger the mass, the bigger the force, and gravity stays the same.

Hope this helped

Answer:

4

Explanation:

oxidation number resolved 4

The oxidation state of an element is calculated by subtracting and the total sum of oxidation states of all the individual atom (excluding the one that has to be calculated) from total charge on the molecule. Therefore, the oxidation state of phosphorous in H[tex]_2[/tex]PO[tex]_2[/tex]⁻ is  +1.

Oxidation state of an element is a number that is assigned to an element in a molecule that represents the number of electron gained or lost during the formation of that molecule or compound.

P[tex]_4[/tex]  [tex]\rightarrow[/tex] H[tex]_2[/tex]PO[tex]_2[/tex]⁻

Oxidation number of P=0

Oxidation number of P in H[tex]_2[/tex]PO[tex]_2[/tex]⁻

(+1)×2+ Oxidation number of P + (-2)2 = -1

2 + Oxidation number of P -4 = -1

Oxidation number of P= +1

Therefore, the oxidation state of phosphorous in H[tex]_2[/tex]PO[tex]_2[/tex]⁻ is  +1. The oxidation state of phosphorous in P[tex]_4[/tex] is 0.

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Answer:

Explanation:

Argon and neon are inertial gases. So, I would choose oxygen and chlorine

Answer:

the answer is oxygen and chlorine

Answer:

The earth circling the sun

Answer: Near the Protons. The electron structure of bromine is illustrated above. In chemical reactions, how does the valence configuration of Bromine tend to change? ... It loses one electron.

Explanation:

btw i found that on google lol

Answer:

kevin gates with his fine self.

Explanation:

Answer:6969?

Explanation:

Answer:

it will be 4M because molarity = no.of mole/volume

The molarity of the solution is 4 M.

The moles of a solute per liter of a solution is known as molarity, which is also defined as molar concentration of a solution.

Molarity can be calculated by using the following formula,

[tex]Molarity\;\\=\;\frac{Moles\; of\; the\; solute}{volume\; of\; the\; solution}\\\\= \frac{8\; mol}{ 2\;L} \\=\;4 \;mol/L\\=\;4\;M[/tex]

Hence the molarity of the solution comes out to be 4 M.

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Answer:

convection

Explanation:

hope it's useful to you

Answer:

C

Explanation:

The balanced equation for breakdown of barium chlorate into barium chloride and oxygen as follows: [tex]\rm 2 Ba(ClO_3)_2 \rightarrow 2 BaCl_2 + 3 O_2[/tex]

In chemistry, a balanced equation is one that depicts a reaction in which there are the same numbers of atoms of each element on both sides of the equation. The idea that matter is neither generated nor destroyed during a chemical reaction is known as the conservation of mass.

It is possible to write the equation for the balanced breakdown of barium chlorate into barium chloride and oxygen as follows: [tex]\rm 2 Ba(ClO_3)_2 \rightarrow 2 BaCl_2 + 3 O_2[/tex] . The number of atoms must be taken into consideration in this balanced equation by multiplying the subscripts inside brackets by the coefficient outside of the brackets. With the same number and kinds of atoms on both sides of the reaction, this guarantees that the equation complies with the rule of conservation of mass.

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Answer:

90.71 KJ

Explanation:

From the reaction equation, lead is the cathode while copper was the anode.

Hence;

E°anode = +0.34V

E°cathode = -0.13 V

E°cell =E°cathode - E°anode

E°cell = -0.13 V - 0.34V

E°cell = -0.47 V

But;

ΔG° = -nFE°cell

n= number of electrons transferred = 2

F = Faraday's constant = 96500 C

E°cell = -0.47 V

ΔG° = -(2 * 96500 * (-0.47))

ΔG° = 90,710 J or 90.71 KJ

The standard Gibbs free energy for the reaction

Pb²⁺(aq) + Cu(s) → Pb(s) + Cu²⁺(aq) is 89.3 kJ/mol.

Let's consider the following redox reaction.

Pb²⁺(aq) + Cu(s) → Pb(s) + Cu²⁺(aq)

We can identify both half-reactions.

Reduction (Cathode): Pb²⁺(aq) + 2 e⁻ → Pb(s)    E°red = -0.126 V

Oxidation (Anode): Cu(s) → Cu²⁺(aq) + 2 e⁻       E°red = +0.337 V

We can calculate the standard potential of the cell (E°cell) using the following expression.

E°cell = E°red,cathode - E°red,anode = -0.126 V - 0.337 V = -0.463 V

The standard Gibbs free energy (ΔG°) is a way to measure the spontaneity of a reaction. We can calculate it using the following expression.

ΔG° = − n × F × E°cell =

ΔG° = − 2 mol × (96,485 J/V.mol) × (-0.463 V) × (1 kJ/1000 J) = 89.3 kJ/mol

where,

Since ΔG° > 0, the reaction is not spontaneous.

The standard Gibbs free energy for the reaction

Pb²⁺(aq) + Cu(s) → Pb(s) + Cu²⁺(aq) is 89.3 kJ/mol.

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Answer:

This question is incomplete

Explanation:

This question is incomplete because of the absence of attachment to show what is being referred to in the question. However, the difference in elevation from two points on the same "plane" can be calculated by subtracting the total distance from where the measurement started to point C from the total distance from where the measurement started to point D. Both measurements must have started from the same origin (usually zero).

Answer:

1)Filtration to remove sand

2)Evaporation to obtain sugar

Explanation:

Add water to the mixture and mix,sugar will dissolve.

Filter out the sand.

Evaporate the remaining solution to obtain the sugar.

Answer:gamma rays

Explanation: your welcome

Answer:

11011111111111111111122

Answer:

2I- ---> I2 + 2e- = O

Au+3 + 3e- ---> Au = R

Explanation:

The first loses electrons, so it is Oxidized, and the second one gains electrons, so it is Reduced. (Also I just did this and saw the answers were O and R respectively)

Answer: o, r

Explanation:

i did the assignment on edge on 2022

Answer:

D. Ethane molecules have no hydrogen bonds and need less energy to separate.

Explanation:

Edge2020

Have a great day y'all :)

Based on the structural formulas, the compound that is more soluble in water and best helps to explain is Propanol, because its molecules can form hydrogen bonds with water molecules but those of ethane cannot. Therefore, option D is correct.

A chemical formula is a notation used by chemists to represent the number and kind of atoms present in a molecule. A written chemical formula is a straightforward illustration of an actual, three-dimensional molecule.

There are three main types of chemical formulas: empirical, molecular and structural.

Chemical bonds connecting the atoms of a molecule are located in structural formulae. A structural formula is made up of symbols for the atoms joined by brief lines that stand in for chemical bonds.

Propanol is the substance that is more soluble in water and better aids in explanation based on structural formulae, as opposed to ethane, whose molecules are unable to establish hydrogen bonds with water molecules.

Thus, option D is correct.

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Answer:

magnesium has a greater charge, there will be greater attraction between delocalised electrons and the positively charged ion.

Explanation:

I did this once and got it right I hope you get it right too

Answer:

Explanation:

The new volume can be found by using the formula for Boyle's law which is

[tex]P_1V_1 = P_2V_2[/tex]

Since we are finding the new volume

[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]

From the question we have

[tex]V_2 = \frac{5 \times 760}{380} = \frac{3800}{380} = \frac{380}{38} \\ [/tex]

We have the final answer as

Hope this helps you

By applying Boyle's law, the final volume of this balloon is equal to 10,000 mL.

Given the following data:

Initial volume = 5.0 L.

Final pressure = 380 torr.

Initial pressure = 760 torr.

In order to determine the final volume of this balloon, we would apply Boyle's law.

Mathematically, Boyle's law is given by this formula:

PV = k

P₁V₁ = P₂V₂

Where:

Making V₂ the subject of formula, we have:

V₂ = (P₁V₁)/P₂

Substituting the given parameters into the formula, we have;

V₂ = (760 × 5.0)/380

V₂ = 3800/380

V₂ = 10 L

In milliliters, we have:

1 L = 1000 mL

10 L = X mL

X = 1000 × 10

V₂ = 10,000 mL.

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