The ____________________ metals are all of the elements located in groups 3-12 on the Periodic Table.

Answer:

D. The element has gained one or more electrons.

Explanation:

What it means for an element to be reduced is that the element has gained one or more electrons. Also when it's oxidation number decreases, it means that the element is reduced.

I hope it helps! Have a great day!

Photosynthesis is a chemical change as:

A. New substances are formed with properties that are different from the original substances.

A chemical change happens when one chemical substance is transformed into one or more different substances. A chemical change is different from a physical change, which doesn't rearrange atoms or molecules and produce a completely new substance.

Thus, correct option is A which proves that photosynthesis is a chemical change.

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The NaOH solution has a 159.75 mL capacity.1.500 M H3PO4 solution in 25.00 mL.

How much NaOH was used for the titration?

In a titration of the two chemicals, 26.60 mL of sulfuric acid is neutralized by 32.20 mL of sodium hydroxide that has a concentration of 0.250 mM.

In a titration of the two chemicals, 26.60 mL of sulfuric acid is neutralized by 32.20 mL of sodium hydroxide that has a concentration of 0.250 mM.

The percent volume/volume of a solution can be calculated using the following formula, which bases its results on the milliliter as the unit of volume (v):

As mL of solute per 100 mL of solution, % v/v is expressed.

X% = 5.0 mL HCl/100 mL of solution is a good illustration.

X/100 = 5.0/100. 100X = 500. \sX = 5.0%%

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The statement made by the student is incorrect because the solubility of a substance is usually expressed in terms of the amount of solute that can dissolve in a given amount of solvent at a particular temperature, not in terms of the amount of solution.

Therefore, the correct statement should be that the solubility of KCl at 20 o C is 36g of KCl per 100g of water (or any other specified solvent).

The statement is incorrect because it should state that the solubility of potassium chloride (KCl) at 20°C is 36g of KCl per 100g of water, not per 100g of solution. Solubility refers to the maximum amount of solute (KCl in this case) that can dissolve in a solvent (water) to form a saturated solution at a specific temperature.

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Answer:

Difusión

Explanation:

La difusión es el movimiento de las partículas de una sustancia desde una región de mayor concentración a una región de menor concentración.

La difusión es una evidencia de que la materia está compuesta de partículas.

Si abro un perfume en un extremo de una habitación, la fragancia se percibe en el otro extremo de la habitación después de unos segundos debido a la difusión

The correct option is a. \(H_3PO_4\) and \(NaH_2PO_4\) is the best combination for preparing a pH 7 buffer.

A buffer solution is a solution that can resist changes in pH upon the addition of small amounts of acid or base. A pH 7 buffer is a buffer that has a pH of 7, which is neutral.

To prepare a buffer solution with a pH of 7, we need to choose a weak acid and its conjugate base or a weak base and its conjugate acid, whose pKa is close to 7.

Looking at the dissociation constants of phosphoric acid, we can see that Ka1 = \(7.5 * 10^{-3\)  is the closest to a pKa of 7. Therefore, we should choose the conjugate acid-base pair that involves \(H_2PO_4^-\) and \(HPO_4^{2-}\) ions.

From the given options, the best combination for preparing a pH 7 buffer is option a: \(H_3PO_4\) and \(NaH_2PO_4\). This is because \(H_3PO_4\) can act as a weak acid and \(NaH_2PO_4\) can act as its conjugate base. By choosing appropriate amounts of these two substances, we can create a buffer solution with a pH of 7.

Option b is not a suitable combination as adding HCl will make the solution acidic and would not result in a pH 7 buffer.

Option c involves using \(NaH_2PO_4\) and \(Na_3PO_4\), which are not a conjugate acid-base pair.

Option d involves using \(NaH_2PO_4\) and \(NaH_2PO_4\) , which are conjugate acid-base pairs but their respective Ka values are not close to 7, and hence not suitable for preparing a pH 7 buffer.

Option e involves using \(H_3PO_4\) and \(Na_3PO_4\) , which are not a conjugate acid-base pair.

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Answer:

yes

Explanation:gergrgregbfbwerbebw

Answer:

the element is oxygen

Explanation:

it will react to give H2O

Answer:

The density is 0.0187 g/L

Explanation:

First thing to do here is to calculate the Volume of 1 mole of CO2 using the ideal gas equation

Mathematically;

PV = nRT

thus V = nRT/P

what we have are;

n = 1 mole

R is the molar has constant = 0.082 L•atm•mol^-1•K^-1

P is the pressure = 0.0079 atm

T is temperature = 227 K

Substituting these values, we have;

V = nRT/P = (1 * 0.082 * 227)/0.0079

V = 2,356.20 dm^3

This means according to the parameters given in the question, the volume of 1 mole of carbon iv oxide is 2,356.20 dm^3

But this is not what we want to calculate

What we want to calculate is the density

Mathematically, we can calculate the density using the formula below;

density = molar mass/molar volume

Kindly recall that the molar mass of carbon iv oxide is 44 g/mol

Thus the density = 44/2356.20 = 0.018674136321195 which is approximately 0.0187 g/L

The theoretical yield of Cu(s) is 2.291 grams.

To determine the theoretical yield of Cu(s), we need to find the limiting reagent and use it to calculate the maximum amount of Cu(s) that can be produced.

The reactions in the lab manual are not provided, so we will assume that the experiment involves reducing Cu²⁺ to Cu(s) using a reducing agent such as Zn(s) or Al(s):

Cu²⁺(aq) + Zn(s) → Cu(s) + Zn²⁺(aq)

Based on this reaction, the balanced equation is:

CuCl₂(aq) + Zn(s) → Cu(s) + ZnCl₂(aq)

The stoichiometry of the reaction tells us that 1 mole of CuCl₂ reacts with 1 mole of Zn to produce 1 mole of Cu. Therefore, the moles of Cu produced will be equal to the moles of Zn used in the reaction.

We can calculate the moles of Zn needed to react with all of the CuCl₂ using the initial amount of CuCl₂:

moles of CuCl₂ = 0.0360 mol

moles of Zn needed = 0.0360 mol

Now we can calculate the theoretical yield of Cu:

moles of Cu = moles of Zn = 0.0360 mol

mass of Cu = moles of Cu x molar mass of Cu

= 0.0360 mol x 63.546 g/mol

= 2.291 g

Therefore, by calculating we can say that the theoretical yield of Cu(s) is 2.291 grams.

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4.68L is the final volume.

The volume of a gas is inversely proportional to its temperature when pressure is held constant. This means that when the temperature of the gas is decreased, its volume will increase.

Therefore, the final volume of the 17.0 L of carbon dioxide will be greater than 17.0 L after it is cooled from 38°C to 5°C.

The equation to calculate the final volume is:

\(V2 = V1 * (\frac{T2}{T1})\)

where T1 is the starting temperature, T2 is the ending temperature, V1 is the starting volume, and V2 is the finished volume.

Using this equation, the final volume of the carbon dioxide can be calculated as:

\(V2 = 17.0 L * (\frac{5\°C}{38\°C}) \\V2= 4.68 L\)

Therefore ,The Final volume is 4.68L

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Answer:

I believe the answer is A

Explanation:

Work and energy are related because when you work, you cause displacement in the object you are exerting upon. While this happens, you transfer energy between the systems. Both work and energy share the same SI unit, called the joule.

Calculating the solubility product constant (Ksp) from thermodynamic data involves using the standard free energy change of the dissolution reaction, ΔG°, which is related to Ksp by the equation: ΔG° = -RTlnKsp, where R is the gas constant and T is the temperature in Kelvin.

To calculate Ksp from thermodynamic data, you first need to determine the standard free energy change of the dissolution reaction. This can be done using thermodynamic tables or equations, such as the Gibbs-Helmholtz equation. Once you have ΔG°, you can use the above equation to calculate Ksp.

It's important to note that thermodynamic data alone may not always be sufficient to accurately determine Ksp. Experimental data, such as solubility measurements, may also need to be taken into account. Additionally, factors such as the effect of pH and the presence of other ions in solution can also affect Ksp and should be considered when calculating it.

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In the chemical reaction the reactants are oxygen and ethanolc acid while the product are water and carbon dioxide.

In a chemical reaction, reactants are the substances that react with each other to form products.

Therefore, oxygen and ethanoic acid are reactants while carbon dioxide and water are products.In a combustion reaction, a substance is burned in the presence of oxygen, resulting in the release of heat and light.

During this reaction, the oxygen reacts with the substance to produce carbon dioxide and water. In the given reaction, ethanoic acid (CH3COOH) is burned in the presence of oxygen (O2), producing carbon dioxide (CO2) and water (H2O).

Thus, oxygen and ethanoic acid are reactants, while carbon dioxide and water are products.

The combustion reaction of ethanoic acid is shown as follows:

2CH3COOH + 3O2 = 2CO2 + 2H2O + heat and light

This means that for every two molecules of ethanoic acid and three molecules of oxygen that react, two molecules of carbon dioxide and two molecules of water are produced. The heat and light produced are also released.

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Vinegar is made up of the same basic things because it is a mixture of acetic acid and water, and acetic acid is made up of carbon, hydrogen, and oxygen.

Vinegar is a solution of acetic acid and water. Acetic acid is a carboxylic acid that is made up of carbon, hydrogen, and oxygen. Therefore, vinegar is made up of carbon, hydrogen, and oxygen, the same basic things as acetic acid.According to the structure of vinegar, it is a liquid made by fermenting alcohol. The basic things in vinegar are acetic acid and water. Acetic acid contains carbon, hydrogen, and oxygen.

The water molecule is made up of hydrogen and oxygen atoms bonded together, while the acetic acid molecule is made up of carbon, hydrogen, and oxygen atoms bonded together.To summarize, vinegar is made up of the same basic things because it is a mixture of acetic acid and water, and acetic acid is made up of carbon, hydrogen, and oxygen.

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Answer:

32.980 sulfur atoms are present in 500 mg

Equilibrium constant is the only concept that is to be used here to calculate partial pressure of nitrogen. Therefore, the equilibrium constant expression for the given system can be represented as Kp= [H₂]²[0₂]/ [H₂O]².

Equilibrium constant is a rate constant at equilibrium shows the values of reaction with respect to the atmospheric pressure and concentration. Kc is equilibrium constant with respect to concentration. Kp is equilibrium constant with respect to atmospheric pressure.

The balanced equation for the given reaction can be written as

2H₂O(g) → 2H₂(g) + O₂(g)

since all the substance are in liquid phase, the equilibrium constant corresponding to this reaction is Kp, which can be written as

Kp= [H₂]²[0₂]/ [H₂O]²

Therefore, the equilibrium constant expression for the given system can be represented as Kp= [H₂]²[0₂]/ [H₂O]².

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Explanation:

D mole is a power. .......

[NOBr]2/[NO]2[Br2] is the equilibrium expression for 2NO+Br2⇌2NOBr. Therefore, the correct option is option D.

When the observable qualities, such as colour, pressure, temperature, concentration, etc. do not vary, the process is said to be in equilibrium. As "balance" is the definition of the word "equilibrium," it follows because a chemical reaction reflects a balance among the substances and outcomes involved in the reaction.

In some physical processes, such as the melting of ice at 0°C, where both the two substances are present at equilibrium, the equilibrium state can also be observed. Physical equilibrium refers to the equilibrium that results from physical processes like the melting of solids.  [NOBr]2/[NO]2[Br2] is the equilibrium expression for 2NO+Br2⇌2NOBr.

Therefore, the correct option is option D.

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Explanation:

A prism is a solid geometric figure with two identical parallel bases that are both polygons, and the lateral faces are parallelograms with pairs of opposite sides of equal length.

Answer:

8.73

Explanation:

when you are adding or subtracting numbers, the sigfig (significant figure) is based on how many numbers after the decimal. with this info, we can see that 15.67 has 2 sigfigs and 6.943 has 3 sigfigs. when you subtract normally, you would get 8.727, which has 3 sigfigs, so you would round the last 7 up to get 8.73 with 2 sigfigs!

also it is to 2 sigfigs because we know that we go by the least number of sigfigs. hope this helped!

The best reagent for each step is NaNH2, NH2 and CH3I, and HBr.

First of all in the presence of strong base ammonia, we het the clcylated product chain elongation gives but-2-ene followed by bromination gives 2-dibromobutane.

Alkyne using NH3 gets converted into Elongated chain alkyne followed by Hbr.

The reaction of bromine with (E)-stilbene is a classic reaction performed as an example of an electrophilic addition reaction of alkenes. The reaction is stereospecific through an anti addition to the double bond. The traditional reaction uses a bromine solution in methylene chloride, which has very high toxcity.

This bromination reaction demonstrates the stereochemistry of the electrophilic addition of bromine to an alkene. The bromine in this greener approach is generated in situ and eliminates the use of methylene chloride.

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Answer:

Na2S + 2HCl -------------------> 2NaCl + H2S.

2NaCl --------------------------> 2Na + Cl2

Na2S + 2HCl ---------------> 2NaCl + H2S

Explanation:

Stoichiometry Is one of important aspect of Chemistry that will be taught to student learning chemistry. It shows the relationship between the reactants and the product. For instance, the amount a reactant reacts to form the products and the amount of products formed.

The balanced chemical reaction for the equation of reaction given in the question is given below;

Na2S + 2HCl -------------------> 2NaCl + H2S.

One mole of Na2S reacts with 2 Moles of HCl to produce 2 moles of NaCl and one mole of H2S.

2NaCl --------------------------> 2Na + Cl2

Two moles of NaCl breaks down into 2 moles of Sodium(solid) and one mole of Chlorine.

Na2S + 2HCl ---------------> 2NaCl + H2S

One mole of N2S reacts with 2 moles of HCl to produce 2 moles of NaCl and one mole of H2S.

Answer:

The answer to this is A. One kind of atom

Explanation:

The other options make no sense whatsoever. But enjoy.

I hope this helped.

Answer:

A. One kind of atom

Explanation:

Isotope -

What is the term for atoms that have the same number of neutrons and protons but a different energy configuration?

Atoms that have the same number of protons but different numbers of neutrons are known as isotopes. Isotopes have different atomic masses.

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0.3 moles of Oxygen is excess reactant (reagent) when yield is 100% .

NO =5.6 moles

O2= 3.1 moles

2NO + O2 --> 2NO2 the chemical reaction.

the ratio of NO and O2 is 2:1

therefore for 5.6 moles of NO, 2.8 moles of Oxygen(O2) is required. So 3.1moles - 2.8 moles = 0.3 moles

The reactant in a chemical reaction that is present in a quantity that is larger than what is required to fully react with the limiting yield is known as the excess reactant. The substance(s) still present after a chemical reaction has reached equilibrium in yield are the reactant(s). Subtract the mass of excess reagent eaten from the total mass of excess reagent provided to determine the quantity of yield that is still present. Reactants in a chemical reaction are referred to as excess reagents if they are still present after the reaction is complete.

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