The addition of one or more electrons to a neutral atom results in a

a. Positively-charged cation

b. Negatively-charged anion

c. Negatively-charged cation

d. Positively-charged anion

Option (d)  a mixture has different melting and boiling points than the pure substances from which it is made.

This property of a mixture can be used to tell the difference between a container of salt water and a container of distilled water as the two given mixtures are homogeneous mixture as they have a uniform composition throughout the substance.

Therefore the given two mixtures are solution and hence they have different melting and boiling points than the pure substances from which they are made of.

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All aquatic life uses dissolved oxygen in surface water, hence this element is frequently analyzed to determine the "health" of lakes and streams. Both groundwater discharge and atmospheric oxygen enter streams.

The amount of oxygen that is dissolved in the water, or the amount of oxygen that is available to living aquatic organisms, is measured by the term "dissolved oxygen" (DO). We can learn a lot about the water quality of a stream or lake by measuring the amount of dissolved oxygen present.For many years, the USGS has been measuring water. No matter where in the United States the water is being researched, some measures are virtually always made, including temperature, pH, and specific conductance. Dissolved oxygen (DO), a measurement of how much oxygen is dissolved in the water, is another often used indicator that can reveal a lot about the measuement  of (water quality).

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Answer:

2 degrees celcius

Explanation:

Explanation:

The pH of a substance can be found by using the formula

\(pH = - log[ H^{ + } ]\)

where [ H+ ] is the hydrogen ion concentration in the substance

From the question

[ H+ ] = 2.1 × 10-¹² M

To find the pH substitute the value into the above formula

We have

\(pH = - log(2.1 \times {10}^{ - 12} ) \\ = 11.6777807 \: \: \: \: \: \: \)

We have the answer as

The solution is basic since it lies in the basic region that is from 8 to 14

Hope this helps you

The answer is Solution!

Explanation:

Solution is a homogeneous mixture

of two or more substance. In a

sugar solution, sugar gets uniformly

mixed with water

Pests are drawn to the home for a number of reasons, including 

Any animal or plant that is dangerous to people or causes them harm is considered a pest. The phrase is especially used to describe animals that disturb people, especially in their houses, or cause harm to forests, cattle, or crops.

When other creatures' actions have a negative impact on human goals, humans are intolerant of their existing in the same location as them. Humans have altered the environment for their own interests. As a result, while an elephant is acceptable in its native habitat, it becomes a problem when it tramples crops.

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(a) To calculate the pH of a solution, we need to first determine the concentration of hydrogen ions (H+). For a strong base like Ba(OH)2, we can assume that it dissociates completely in water, yielding two hydroxide ions (OH-) for every one molecule of Ba(OH)2. Therefore, the concentration of OH- in the solution would be 2 times the concentration of Ba(OH)2, which is 1.58 × 10^-3 M (7.9 × 10^-4 M × 2).

Next, we can use the equation for the dissociation of water (Kw = [H+][OH-]) to solve for the concentration of H+ ions:

Kw = [H+][OH-]
1.0 × 10^-14 = [H+][1.58 × 10^-3]
[H+] = 6.33 × 10^-12 M

Finally, we can use the equation for pH (pH = -log[H+]) to find the pH of the solution:

pH = -log(6.33 × 10^-12) = 11.2

Therefore, the pH of a 7.9 × 10^-4 M Ba(OH)2 solution is 11.2.

(b) For a strong acid like HNO3, we can assume that it dissociates completely in water, yielding one hydrogen ion (H+) for every one molecule of HNO3. Therefore, the concentration of H+ in the solution would be equal to the concentration of HNO3, which is 8.5 × 10^-4 M.

Next, we can use the equation for pH (pH = -log[H+]) to find the pH of the solution:

pH = -log(8.5 × 10^-4) = 3.07

Therefore, the pH of an 8.5 × 10^-4 M HNO3 solution is 3.07.

In summary, the pH of a solution can be calculated using the concentration of H+ or OH- ions in the solution, depending on whether it is an acid or a base. For a strong acid or base, we can assume complete dissociation in water, making the calculation straightforward.

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Answer:

1st answer choice

P4O6 + 2 O2 -> P4O10

Explanation:

You need to cancel out reactants and products that are the same.

P4 cancels out because it appears in both reactants and products

We get 2 O2 in the reactants because 5-3= 2

Thus, answer choice 1 is correct.

To solve this we must be knowing each and every concept related to mutation and types of mutations. Therefore, the correct option is option C.

A mutation is, at its most basic, a change or alteration. Chromosome and gene alterations, known as mutations in biology, frequently appear physically.

One grizzly bear population has moved to an area that has snow year-round. If a mutation for coat color is going to spread through the population then Grizzly bears that have a lighter fur mutation can catch prey more easily and so have more resources to have more offspring. Due to this, the trait starts to spread through the population.

Therefore, the correct option is option C.

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198 ml To create 4% NaOH, you will need 7.92 grammes of sodium hydroxide, or (4 x 198)/100. So, 7.92 grammes of sodium hydroxide are dissolved in 198 ml of water.

The molarity of a solution is decreased by dilution. An aqueous solution's volume grows with the addition of more water, while the solute's moles remain constant. As a result, the solution's concentration and molarity are reduced.

Dilution happens as the solution's volume increases. As just a result, conductivity decreases and ions per millilitre increase. The molar conductivity is calculated using one mole of ions. The molar conductivity of the solution rises as a result of increased ion separation and mobility.

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Answer:

answer this and ill answer that

Explanation:

during a heating or cooling process, how are changes in enthalpy and temperature related?​

Answer:

It gives the number of protons in the nucleus of each atom of that element.

Explanation:

The heat is absorbed when a 10 gram piece of platinum is warmed from 100 c to 150 c is 66.5 J

Energy is a sort of heat. Heat changes the condition of a substance when it is absorbed by it by weakening and rupturing the inter-particle bonds (solid to liquid for example). A phase change brought on by heat is NOT enough to raise the temperature. A reaction that absorbs heat is called endothermic.

The bulk of the body affects how much heat is absorbed. The bulk of the body directly affects how much heat energy is absorbed. where M is the body's mass and Q is the quantity of heat absorbed.

Using the equation H=cpmT and the water specific heat, the amount of heat absorbed is computed.

Given,

heat of slid platinum = 0.133

150 -100=50

heat absorbed = 0.133*10*50

= 66.5 J

Therefore , The heat is absorbed when a 10 gram piece of platinum is warmed from 100 c to 150 c is 66.5 J

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The standard cell potential is defined as the potential difference between two half-cells under standard-state conditions. It is denoted by E°cell and measured in volts (V).

A positive value of E°cell indicates a spontaneous reaction. If the value of E°cell is negative, then the reaction is non-spontaneous and needs an external voltage to drive it.

The formula for the calculation of free energy is:

ΔG = -nFE° cell where,

ΔG = the change in free energy

= the number of electrons transferred

F = Faraday constant (96485 C/mol)E°

cell = the standard cell potential

For the given reaction:

2ClO2-(aq) + Cl2(g) → 2ClO2(g) + 2Cl-(aq)

The balanced half-reactions are:

Cl2(g) + 2e- → 2Cl-(aq)  

E°red = +1.36 V2ClO2-(aq) + 2H2O(l) + 4e- → 2Cl-(aq) + 4OH-(aq)  

E°red = +0.90 V

By combining the two half-reactions, multiplying the first half-reaction by 2, and adding, we get:

2ClO2-(aq) + Cl2(g) → 2ClO2(g) + 2Cl-(aq)E°cell

= E°(red, cathode) - E°(red, anode)

= [E°red(Cl-(aq)) - E°red(Cl2(g))] - 2[E°red(ClO2-(aq))]

= [(+1.36 V) - 0.00 V] - 2[(+0.90 V)]

= -0.44 V

Now, substituting the values of n, F, and E°cell in the formula for G, we get:

ΔG = -nFE°cell

= -2 x 96485 C/mol x (-0.44 V)

= 83680 J/mol

= 83.68 kJ/mol

Therefore, the free energy of the given reaction is -83.68 kJ/mol (exothermic).

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i think its double replacement if i'm not mistaken  

Answer:

The answer is E) none of the above.

In all of the given reactions, mass and charge are conserved. The law of conservation of mass states that the mass of reactants must be equal to the mass of the products in a chemical reaction. The law of conservation of charge states that the total charge of the reactants must be equal to the total charge of the products.

In reaction A, the water molecule dissociates into a hydrogen ion (H+) and a hydroxide ion (OH-), but the total mass and charge are still conserved.

In reaction B, the reduction of CIO2 to Cl- is balanced by the oxidation of water to form OH-. The electrons and charge are conserved.

In reaction C, H2SO4 reacts with NaOH to form Na2SO4, H+ and OH-. The mass and charge are conserved.

In reaction D, ZnCl reacts with water to form ZnOH, H+ and Cl-. The mass and charge are also conserved.

Option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.

The long-run equilibrium condition for perfect competition is that price (P) is equal to average total cost (ATC), which is also equal to marginal cost (MC), and marginal revenue (MR).

Option (d), P=ATC=MR=MC, best represents the long-run equilibrium condition for perfect competition. In perfect competition, firms operate at the minimum point of their average total cost curve, where price equals both average total cost and marginal cost. This condition ensures that firms are earning zero economic profit and are producing at an efficient level.

In the long run, if firms are earning economic profit, new firms will enter the market, increasing competition and driving prices down. Conversely, if firms are experiencing losses, some firms may exit the market, reducing competition and causing prices to rise. This process continues until firms reach a state where price equals average total cost, marginal cost, and marginal revenue, ensuring a long-run equilibrium.

Therefore, option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.

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Answer:

coefficients

Explanation:

good luck

Answer:

Explanation:

1. Sodium

2. Ammonium Carbonate

3. Potassium phosphate

4. Calcium sulphate

5. Zinc nitrate

6. Iron(III) oxide-hydroxide

7. Aluminium phosphate

8.Cobalt(III) Carbonate

9. Iron(II) sulfate

10. Magnesium chloride

11. Nitric acid

Answer:

1. Sodium

2. Ammonium Carbonate

3. Potassium phosphate

4. Calcium sulphate

5. Zinc nitrate

6. Iron(III) oxide-hydroxide

7. Aluminium phosphate

8.Cobalt(III) Carbonate

9. Iron(II) sulfate

10. Magnesium chloride

11. Nitric acid

Explanation:

Explanation:

no of moles = mass / molar mass

mr of Al ( OH)3 = 27+ (16 × 3) + (1 ×3)

= 78

n = 384.3 / 78

n = 4.92692...

n = 4.93

therefore, no of moles = 4.93

Answer:

In 1932, the physicist James Chadwick conducted an experiment in which he bombarded Beryllium with alpha particles from the natural radioactive decay of Polonium. The resulting radiation showed high penetration through a lead shield, which could not be explained via the particles known at that time.

Explanation:

In literary classes, the three most popular types are verbal irony, dramatic irony, and situational irony. When a speaker or narrator says something that contradicts what they mean, what they intend, or what the context necessitates, this is called verbal irony.

One thing is expressed while another is meant in an ironic statement. For example, on a chilly, wet gray day, you would exclaim, "What a gorgeous day!" Alternatively, if you were suffering from a severe case of food sickness, you may respond, "Wow, I feel terrific today." "ffers points of view and ideas that are, at most, intriguing... However, it does not reach the truth." Ronagh and Souder are particularly concerned with scientific assertions that are not meant to be taken seriously.

Here,

The three most common varieties in literary studies are verbal irony, dramatic irony, and situational irony. Verbal irony occurs when a speaker or narrator says something that contradicts what they mean, what they intend, or what the context requires.

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The molarity of the base would be 0.36 M.

What is Molarity?

The number of moles of dissolved solute per litre of solution is the definition of molarity, a unit of concentration. Molarity is defined as the number of millimoles per millilitre of solution by dividing the number of moles and the volume by 1000. A precise 1.000 mole of KCl (74.55 g) must be dissolved in a quantity of water or another solvent to produce a precise 1.000 litre of solution in order to create a 1.000 M solution of KCl.

In actuality, this concentration unit is frequently abused. Since KCl is totally dissociated, the solution, for instance, with water as the solvent, is exactly 1.000 M in K+ and 1.000 M in Cl.

Recall that: mole = molarity x volume

Also; molarity = mole/volume

Mole of 0.624 M, 27.4 mL HBr = 0.624 x 27.4/1000

                                                 = 0.017 mol

If the mole of HBr is 0.017 mol, the equivalent mole of NaOH will also be 0.017 mol.

0.017 mol of 47.2 mL (0.0472 L) NaOH would molarity of:

0.017/0.0472 = 0.36 M

In other words, the molarity of the NaOH is 0.36 M.

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Answer:

Hi - First you need to determine whether there is a metal or no and from there there are certain rules in order to name the compound. Here is a flowchart to try and help.

The correct answer is: D. All of the above.

In the chemical reaction 2Al(s) + 3Pt(NO3)2(aq) -> 3Pt(s) + 2Al(NO3)3(aq), we can determine the role of Al(s) by examining the changes in oxidation states.

The reducing agent: A reducing agent is a substance that undergoes oxidation, meaning it loses electrons, and causes the reduction of another species by donating electrons. In this reaction, Al(s) is oxidized from an oxidation state of 0 to +3 in Al(NO3)3(aq). Therefore, Al(s) is not the reducing agent.

The electron donor: An electron donor is a substance that donates electrons to another species. In this reaction, Al(s) donates electrons to Pt(NO3)2(aq), resulting in the reduction of Pt(II) ions to Pt(s). Therefore, Al(s) acts as the electron donor.

Being oxidized: When a substance undergoes oxidation, it loses electrons and increases its oxidation state. In this reaction, Al(s) is oxidized from an oxidation state of 0 to +3 in Al(NO3)3(aq). Therefore, Al(s) is being oxidized.

From the analysis above, we can conclude that the correct answer is:

D. All of the above

Al(s) is the electron donor, it undergoes oxidation and loses electrons, and therefore acts as the reducing agent in this chemical reaction. It is important to note that in redox reactions, the species that is oxidized is the reducing agent, and the species that is reduced is the oxidizing agent.

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Answer:

The answer is "As \(Q=336\), at high-temperature \(\Delta G_{rxn}>0\) and When\(K>1,\)\(\Delta G^{\circ}_{rxn}>0\)."

Explanation:

The equation for the reaction is:

\(A(g) \leftrightharpoons B(g)\)  

\(K=5.8\\\\Q=336\)

At equilibrium,

\(\Delta G^{\circ}_{rxn}>0\)\(=-RT \ln \ K\)

When k=5.8(>1), the value of \(\ln k\) would be positive

So, \(\Delta G^{\circ}_{rxn}\) is negative (< 0)

So if K > l, \(\Delta G^{\circ}_{rxn}<0\)

If the reaction is not in equilibrium so the equation is :

\(\Delta G_{rxn}>0\)=\(\Delta G^{\circ}_{rxn}\)\(+RT \ln Q\)

Substituting the expression:

\(\Delta G_{rxn}>0\)\(= (-RT \ln K) + RT \ln Q\)

                 \(= RT(\ln Q- \ln K)\\= RT(\ln (336)-\ln (5.8))\\= RT(4.06)\)

It is the positive value for all temperatures.

So, As Q = 336, at the high temperature \(\Delta G_{rxn}>0\).