Arrange these elements according to electron affinity.
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He, C F

A molecule must be a pure substance hence the correct answer is " All molecules are pure substances."

A pure substance is one which contains only one element or compound. A molecule is the smallest unit of a compound that can exist independently.

When we refer to a molecule of a compound, we are referring to that pure substance that contains only the element(s) that compose the compound.

Hence; All molecules are pure substances.

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The reversible production of carbon dioxide and hydrogen gas as a result of a reaction between steam and carbon monoxide. The chemical formula for a balanced reaction is CO (g) + H2O (g) CO2 (g) + H2(g).

Carbon dioxide (CO2) and hydrogen gas are created when carbon monoxide (CO) and water mix (H2O). The process is reversible and every molecule in the balanced equation has a coefficient of 1.

Significant amounts of carbon are released into the atmosphere as a result of the burning of fossil fuels, changing land use, and the production of concrete with limestone.

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Answer:

solution,

Force=4 N

Distance=0.3 m

Now,

\(work = f \times d \\ \: \: \: \: \: \: \: \: \: \: \: = 4 \times 0.3 \\ \: \: \: \: \: \: \: \: \: \: \: = 1.2 \: joule\)

hope this helps...

Good luck on your assignment....

The mass of the asteroid is C. 1.2 x \(10^{12}\) Kg

To find the mass of the other asteroid, we can rearrange the equation for the gravitational force between two objects:

F = (G * m1 * m2) / \(r^{2}\)

where F is the force of gravity, G is the gravitational constant, m1 and m2 are the masses of the two asteroids, and r is the distance between them.

Given that the distance between the asteroids is 75000 m, the force of gravity between them is 1.14 N, and one asteroid has a mass of 8 x \(10^{7}\) kg, we can substitute these values into the equation and solve for the mass of the other asteroid (m2):

1.14 N = (6.67430 × \(10^{-11}\) N \(m^{2}\)/\(Kg^{2}\) * 8 x \(10^{7}\) kg * \(m2\)) / \((75000 m)^{2}\)

Simplifying and solving the equation, we find that the mass of the other asteroid (m2) is approximately 1.2 x \(10^{12}\) kg. Therefore, Option C is correct.

The question was incomplete. find the full content below:

Two asteroids are 75000 m apart one has a mass of 8 x \(10^{7}\) kg if the force of gravity between them is 1.14 what is the mass of the asteroid

A. 3.4 x \(10^{11}\) kg

B. 8.3 x \(10^{12}\) kg

C. 1.2 x \(10^{12}\) kg

D. 1.2 x \(10^{10}\) kg

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The total number of moles of reactants and products in the chemical reaction given is 9 moles

The total number of mole of reactants and products in the chemical reaction can be obtained as follow:

2H₂S + 3O₂ -> 2H₂O + 2SO₂

The following were obtained from the above equation:

Total number of mole = Mole of reactants + mole of products

Total number of mole = 5 mole + 4 moles

Total number of mole = 9 moles

Thus, we can say that the total number of mole is 9 moles

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An amino group is a functional group consisting of an amino (-NH2) and a carboxyl (-COOH) group, which is found in proteins.

It is essential for the formation of peptide bonds between amino acids, which are the building blocks of proteins. The amino group is partially positively charged and is therefore able to interact with other molecules through hydrogen bonding and electrostatic interactions.

The amino group is also able to donate a hydrogen atom, making it an important component in many biochemical reactions.

Furthermore, it plays an important role in the folding of proteins, as the electrostatic interactions between the amino and carboxyl groups help stabilize the protein's three-dimensional structure. In addition, the presence of the amino group can influence the solubility of proteins in different solutions.

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Answer: Humans are increasingly influencing the climate and the earth's temperature by burning fossil fuels, cutting down forests and farming livestock.

Explanation: This adds enormous amounts of greenhouse gases to those naturally occurring in the atmosphere, increasing the greenhouse effect and global warming.

The balanced equation of the redox reactions by the half-reaction method is as follows:

(a) Zn(s) + 4 H+(aq) + NO₃⁻(aq) ⟶ Zn²⁺ (aq) + 2 H₂O(l) + N₂(g)

(b) Zn(s) + 2 OH⁻(aq) + NO₃⁻(aq) ⟶ Zn(OH)₂(aq) + NH₃(aq)

(c) CuS(s) + 6 H⁺(aq) + 2 NO₃⁻(aq) ⟶ Cu²⁺(aq) + S(s) + 2 NO(g) + 3 H₂O(l)

(d) 4 NH₃(aq) + 5 O₂(g) ⟶ 4 NO₂(g) + 6 H₂O(l)

(e) 2 H₂O₂(aq) + 2 MnO₄⁻(aq) ⟶ 2 Mn²⁺(aq) + 5 O₂(g) + 4 H₂O(l)

(f) 3 NO₂ (g) + 2 OH⁻ (aq) ⟶ 3 NO₃⁻ (aq) + NO₂⁻ (aq) + H₂O(l)

(g) 2 Fe³⁺ (aq) + 2 I⁻ (aq) ⟶ 2 Fe²⁺ (aq) + I₂ (aq)

Half reactions refer to the separate reactions that represent the oxidation and reduction processes occurring in the overall redox reaction.

Considering the given redox reactions:

(a) Zn(s) + 4 H+(aq) + NO₃⁻(aq) ⟶ Zn²⁺ (aq) + 2 H₂O(l) + N₂(g)

Half-reaction (oxidation): Zn(s) ⟶ Zn²⁺(aq) + 2 e⁻

Half-reaction (reduction): 4 H+(aq) + NO₃⁻(aq) + 3 e⁻ ⟶ 2 H₂O(l) + N₂(g)

(b) Zn(s) + 2 OH⁻(aq) + NO₃⁻(aq) ⟶ Zn(OH)₂(aq) + NH₃(aq)

Half-reaction (oxidation): Zn(s) + 4 OH⁻(aq) ⟶ Zn(OH)₂(aq) + 2 e⁻

Half-reaction (reduction): NO₃⁻ aq) + 8 H₂O(l) + 6 e⁻ ⟶ NH₃(aq) + 9 OH⁻ (aq)

(c) CuS(s) + 6 H⁺(aq) + 2 NO₃⁻(aq) ⟶ Cu²⁺(aq) + S(s) + 2 NO(g) + 3 H₂O(l)

Half-reaction (oxidation): CuS(s) ⟶ Cu²(aq) + S(s) + 2 e⁻

Half-reaction (reduction): 6 H⁺(aq) + 2 NO₃⁻(aq) + 6 e⁻ ⟶ 2 NO(g) + 3 H₂O(l)

(d) 4 NH₃(aq) + 5 O₂(g) ⟶ 4 NO₂(g) + 6 H₂O(l)

Half-reaction (oxidation): 4 NH₃(aq) ⟶ 4 NO₂(g) + 8 H⁺(aq) + 8 e⁻

Half-reaction (reduction): 5 O₂(g) + 10 H₂O(l) + 10 e⁻ ⟶ 20 OH⁻(aq)

(e) 2 H₂O₂(aq) + 2 MnO₄⁻(aq) ⟶ 2 Mn²⁺(aq) + 5 O₂(g) + 4 H₂O(l)

Half-reaction (oxidation): 2 H₂O₂(aq) ⟶ 4 H⁺(aq) + 4 e⁻ + O₂(g)

Half-reaction (reduction): 2 MnO₄⁻(aq) + 16 H⁺ (aq) + 10 e⁻ ⟶ 2 Mn²⁺ (aq) + 8 H₂O (l)

(f) 3 NO₂ (g) + 2 OH⁻ (aq) ⟶ 3 NO₃⁻ (aq) + NO₂⁻ (aq) + H₂O(l)

Half-reaction (oxidation): 3 NO₂(g) + 6 OH⁻(aq) ⟶ 3 NO₃⁻ (aq) + 3 e⁻ + 3 H₂O(l)

Half-reaction (reduction): 3 NO₂ (g) + 2 e⁻ ⟶ 3 NO₂⁻ (aq)

(g) 2 Fe³⁺ (aq) + 2 I⁻ (aq) ⟶ 2 Fe²⁺ (aq) + I₂ (aq)

Half-reaction (oxidation): 2 Fe³⁺ (aq) ⟶ 2 Fe²⁺ (aq) + 2 e⁻

Half-reaction (reduction): 2 I⁻ (aq) ⟶ I₂ (aq) + 2 e⁻

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Answer:

A 1 liter volumetric flask should be used.

Explanation:

First we convert 166.00 g of KI into moles, using its molar mass:

Molar mass of KI = Molar mass of K + Molar mass of I = 166 g/mol

Then we calculate the required volume, using the definition of molarity:

Liters = moles / molarity

Answer:

CH4 (g) and O2 (g) are both in the gaseous state, while CO2 (g) and H2O (g) are also in the gaseous state.

In the above reaction, the reactants are in the gaseous state, and the products formed are also in the gaseous state.

Every compound in a chemical reaction can be in any state of matter like solid, liquid, or gas. In the reaction of methane and oxygen, the initial state of the reactants is in the gaseous form. The chemical reaction of methane and oxygen is given by the equation CH4 (g) + 2 O2 (g) -> CO2 (g) + 2 H2O (g).Here, methane and oxygen are the reactants, and carbon dioxide and water are the products. Methane (CH4) and oxygen (O2) react together in the presence of a spark or heat to produce carbon dioxide (CO2) and water (H2O).In the reaction, the methane gas combines with oxygen gas, which causes the release of heat energy and forms carbon dioxide gas and water vapor. Methane gas is a colorless and odorless gas that burns cleanly and is one of the primary components of natural gas.

The oxygen gas required for the reaction is available in the atmosphere. Carbon dioxide is a colorless gas with a faint odor and taste and is a significant component of the Earth's atmosphere. Water is a colorless, odorless, and tasteless liquid that is essential to life.The state of matter of every compound in a chemical reaction can change depending on the conditions in which the reaction occurs. For instance, a substance that is in the solid state at a lower temperature may melt into a liquid or boil into a gas at a higher temperature. Similarly, a liquid may freeze into a solid or vaporize into a gas under different conditions.

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Answer:

ΔH = 130.5 kJ

Explanation:

Hello,

In this case, by using the Hess law, we compute the enthalpy of the required reaction:

C(s) + H2O(g) --> CO(g) + H2(g)

Thus, the first step is to keep the following reaction unchanged:

C (s) + O2 (g) → CO2 (g), ΔH = -393.5 kJ

Next, we invert and halve this reaction:

2 CO (g) + O2 (g) → 2 CO2 (g), ΔH= -566.0 kJ

So the enthalpy of reaction is inverted and halved:

CO2 (g) → CO (g) + 1/2 O2 (g) ΔH= 283 kJ

Then, we also invert and halve this reaction:

2 H2 (g) + O2 (g) → 2 H2O ΔH= -483.6 kJ

So the enthalpy of reaction is inverted and halved as well:

H2O → H2 (g) + 1/2 O2 (g) ΔH= 241.8 kJ

Finally, we add the three reactions to obtain the required reaction:

= C (s) + O2 (g) + CO2 (g) + H2O → H2 (g) + 1/2 O2 (g) + CO (g) + 1/2 O2 (g) + CO2 (g)

= C (s) + O2 (g) + CO2 (g) + H2O → H2 (g) + O2 (g) + CO (g) + CO2 (g)

= C (s) + H2O → H2 (g) CO (g)

So enthalpy is computed by:

ΔH = -393.5 kJ + 283 kJ + 241.8 kJ

ΔH = 130.5 kJ

Best regards.

Considering the Hess's Law, the enthalpy change for the reaction is 131.3 kJ.

Hess's Law indicates that the enthalpy change in a chemical reaction will be the same whether it occurs in a single stage or in several stages. That is, the sum of the ∆H of each stage of the reaction will give us a value equal to the ∆H of the reaction when it occurs in a single stage.

In this case you want to calculate the enthalpy change of:

C(s) + H₂O(g) → CO(g) + H₂(g)

You know the following reactions, with their corresponding enthalpies:

Equation 1: C (s) + O₂(g) → CO₂ (g)     ΔH = -393.5 kJ

Equation 2:  2 CO (g) + O₂ (g) → 2 CO₂ (g)     ΔH= -566.0 kJ

Equation 3: 2 H₂ (g) + O₂ (g) → 2 H₂O (g)     ΔH= -483.6 kJ  

First, to obtain the enthalpy of the desired chemical reaction you need one mole of C(s) on reactant side and it is present in first equation so let's write this as such.

Now, 1 mole of CO(g) must be a product and is present in the second equation. Since this equation has 2 moles of CO(g) on the reactant side, it is necessary to locate this component on the product side (invert it) and divide it by 2 to obtain 1 mole of CO(g).

When an equation is inverted, the sign of ΔH also changes.

And since enthalpy is an extensive property, that is, it depends on the amount of matter present, since the equation is divided by 2, the variation of enthalpy also is divided by 2.

Finally, 1 mole of H₂O(g) must be a reactant and is present in the third equation. Since this equation has 2 moles of CO(g) on the product side, it is necessary to locate this component on the product side (invert it) and divide it by 2 to obtain 1 mole of H₂O(g).

So, the sign of ΔH also changes and the variation of enthalpy is divided by 2.

In summary, you know that three equations with their corresponding enthalpies are:

Equation 1: C (s) + O₂(g) → CO₂ (g)     ΔH = -393.5 kJ

Equation 2: CO₂ (g) → CO (g) + \(\frac{1}{2}\) O₂ (g)     ΔH= 283 kJ

Equation 3: H₂O (g) → H₂ (g) + \(\frac{1}{2}\) O₂ (g)    ΔH= 241.8 kJ  

Adding or canceling the reactants and products as appropriate, and adding the enthalpies algebraically, you obtain:

C(s) + H₂O(g) → CO(g) + H₂(g)  ΔH= 131.3 kJ

Finally, the enthalpy change for the reaction is 131.3 kJ.

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When the temperature is lowered to -76 °C and the pressure is 0.561 atm, the volume of the balloon will be approximately 179 L.

To solve this problem, we can use the combined gas law equation, which relates the initial and final conditions of a gas sample:

(P1 * V1) / (T1) = (P2 * V2) / (T2)

where P1, V1, and T1 are the initial pressure, volume, and temperature, respectively, and P2, V2, and T2 are the final pressure, volume, and temperature, respectively.

Substituting the given values:

(P1 * 266 L) / (38 + 273.15 K) = (0.561 atm * V2) / (-76 + 273.15 K)

Simplifying the equation:

(0.995 atm * 266 L) / (311.15 K) = (0.561 atm * V2) / (197.15 K)

Solving for V2:

V2 = [(0.995 atm * 266 L) / (311.15 K)] * (197.15 K / 0.561 atm)

V2 ≈ 179 L

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On basis of electronegativity the nature of bonds in compounds are

a) Ionic Bond

b) Polar Covalent Bond

c) Non-Polar Covalent Bond

d) Non-Polar Covalent Bond

Electronegativity is tendency of an atom in a molecule to attract the shared pair of electrons towards itself. If polarity of compound increases the effect of Hydrogenbonding become more stronger and high amount of heat required to break a bond and hence Melting point increases. Electronegativity chart is present below :

Element Symbol Electronegativity

Hydrogen H 2.2

Carbon C 2.55

NItrogen N 3.04

Oxygen O 3.44

Magnesium Mg 1.31

Sulphur S 2.58

Chlorine Cl 3.16

On the basis of electronegativity difference :

Ionic Compound = E.N difference > 1.7.

Polar- covalent Compound = EN difference > 0.4 but EN difference < 1.7.

Non-polar Covalent Compound = EN difference < 0.4. Now, check the difference in provide compounds

1 ) MgCl₂ = 3.16 - 1.31 = 1.85 --> Ionic Bond

2 ) CO₂ = 3.44 - 2.55 = 0.89 --> Polar Covalent Bond

3 ) H₂S = 2.58 - 2.2 = 0.38 --> Non polar Covalent Bond

4 ) NO₂ = 3.44 - 3.04 = 0.40 --> Non polar Covalent bond.

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We can find molarity using the following equation:

In this problem, our solute is CaCO3, and we have 15.7 g of it. To express this amount in moles, what we do is to divide by the molar weight of CaCO3. (Always that you want to pass from grams to moles you do this, just to divide the amount that you have by the molar weight of the substance).

This is:

Now, we have 275mL of solution and this is 0.275L of solution. (To pass from mL to L we just divide by 1000).

Finally, replacing in the formula to find molarity, we have:

The answer is 0.57M.

Answer:

An acid is any hydrogen-containing substance that is capable of donating a proton (hydrogen ion) to another substance. A base is a molecule or ion able to accept a hydrogen ion from an acid.

Answer:

1.Sour in taste

2. Tum blue litmus into red

3. Acids change methyl orange to red

4.Phenolphthalein remains colourless

5. Acids do not give soapy touch

6. Give hydrogen ions in solution

Bitter in taste

Answer:

the correct answers are A,D,E, and G

Explanation:

The balanced equation of the reaction could be written as; \(HN_{5} O_{3} + Mg ------ > MgO + HNO_{3}\)

We know that in chemistry, the term reaction has to do with the combination of two or more species to give a product. Now the process of the reaction would alter the chemical composition of the reactants as we move on the way to get the ne substances called the products. There would be a breaking down of the bonds that holds the reactant molecules together and then there is a recombination of the atoms in a different way so as to obtain the products of the reaction. This is how a chemical reaction takes place in a given system.

In this case we have the oxidation of the compound called \(HN_{5} O_{3}\). In this case, the compound is actually being oxidized as we can see from the process that would be shown in the reaction equation accurately.

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The balanced net ionic equation for the reaction between potassium sulfide and lead(II) nitrate is Pb²⁺(aq) + S²⁻(aq) → PbS(s)

From the question, we are to write the balanced net ionic equation for the given chemical reaction.

The given chemical reaction is

K₂S(aq) + Pb(NO₃)₂(aq) →

The between potassium sulfide and lead(II) nitrate will produce potassium nitrate and lead sulfide.

That is,

K₂S(aq) + Pb(NO₃)₂(aq) → KNO₃(aq) + PbS(s)

Now, balance the equation

K₂S(aq) + Pb(NO₃)₂(aq) → 2KNO₃(aq) + PbS(s)

Write the complete ionic equation

2K⁺(aq) + S²⁻(aq) + Pb²⁺(aq) + 2NO₃⁻(aq)  → 2K⁺(aq) + 2NO₃⁻(aq) + PbS(s)

Cancel out the spectator ions

S²⁻(aq) + Pb²⁺(aq)   → + PbS(s)

Hence, the balanced net ionic equation is

Pb²⁺(aq) + S²⁻(aq) → PbS(s)

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Explanation:

-The most familiar electrolytes are acids, bases, and salts, which ionize when dissolved in such solvents as water or alcohol.

-battery electrolyte is a solution inside batteries. it transports positively charged ions between the cathode and anode terminals.

-The main advantage of solid electrolytes is that they eliminate the risk of leaking and eliminate flammability, which is a safety risk in batteries with liquid electrolytes.

-it is a alkaline battery

Answer:

chemists has their way in doing alot of stuffs

Answer:

Explanation:

Here, we want to get the maximum amount of ammonia that can be produced

From the question, we have it that:

1 mole nitrogen gave 2 moles ammonia

Thus:

4 mole nitrogen will give 8 moles ammonia

Furthermore:

3 moles of hydrogen gave 2 moles of ammonia

5 moles of hydrogen will give:

The maximum amount of ammonia that can be produced is thus 8.0 moles

A list of the ten (10) concepts or words that are associated with motion include the following:

Motion can be defined as a change in the location (position) of a physical object or body with respect to a reference point and time, especially due to the action of an external force.

In Science, there are different types of motion and these include the following:

Generally, there are different concepts, phenomena and words that are associated with motion​​. A list of this ten (10) concepts or words include the following:

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Answer:

Uses nuclear reactions to produce energy

Implodes a fuel pellet

Explanation:

Laser fusion is a method of initiating nuclear fusion reactions through heating, and compressing fuel pellets containing deuterium and tritium using high energy density laser beams. Lase fusion is also known as inertial confinement fusion and the energy produced by the process is known as Laser Inertial Fusion Energy, LIFE.

During the process of laser fusion, small pellets of deuterium-tritium (DT) isotopes mixture are fed into a blast chamber where they are compressed to high densities using a number of amplified laser beams in the chamber.

The high energy density of the beams as well as the heat produced due to compression, induces the thermonuclear explosion ignition resulting in the production of high energetic products such as charged particles, x-rays and neutrons. The energy produced is absorbed and stored as heat in a blanket that is then used in a steam thermal cycle to generate electrical power.

There are two methods of compression of the DT pellet: direct and indirect-drive laser fusions.

However, there are a number of limitations to energy production by this process. One limitation is that the process is extremely inefficient in energy energy production. Also, the heat produced by the flashtubes results innthe deformation of the laser glass.

The amount of sodium bromide that would be formed from the reaction will be 7.5524 grams

Looking at the equation of the reaction:

\(CuBr_2 + 2NaCl --- > CuCl_2 + 2NaBr\)

The mole ratio of CuBr2 and NaCl is 1:2.

Mole of 16.4 grams of CuBr2 = 16.4/223.37

                                                 = 0.0734 moles

Mole of 22.7 grams of NaCl = 22.7/58.44

                                                 = 0.3884 moles

Equivalent mole of NaCl = 0.1468 moles

Thus, NaCl is in excess while CuBr2 is limiting.

Mole ratio of CuBr2 and NaBr = 1:1

Mass of 0.0734 mole NaBr = 0.0734 x 102.894

                                              = 7.5524 grams

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Answer:

adding a catalyst will increase the reaction rate.

Explanation:

im like 95% sure thats right.

Answer:

A. C. D

Explanation:

ap ex

Answer:

3787500 Torr

Explanation:

1 Pascal = 0.0075 Torr

So:

5.05x10^8 Pa --- x

1 Pa --- 0.0075 Torr

x = 5.05x10^8 × 0.0075

x = 3787500 Torr

Answer:

This question appear incomplete

Explanation:

This question appear incomplete because an equation to show the production of sodium chloride from calcium chloride should have been illustrated. However, if the balanced chemical equation showing sodium chloride (NaCl) been a product of a reaction involving calcium chloride (CaCl₂) as a reactant (shown below) is to be used, then we start by writing a complete balanced chemical equation

CaCl₂ + Na₂CO₃  ⇒   CaCO₃ + 2NaCl

From the equation above, it can be deduced that 1 mole of CaCl₂ is required to produce 2 moles of NaCl, thus how many moles of CaCl₂ will be required to produce 6.5 moles of NaCl.

1 mole of CaCl₂ = 2 moles of NaCl

? moles of CaCl₂ = 6.5 moles of NaCl

cross multiply

? moles of CaCl₂ = 6.5 × 1/2

? moles of CaCl₂ = 3.25 moles of CaCl₂

3.25 moles of CaCl₂ will be needed to produce 6.5 moles of NaCl