name two ores from which zinc is extracted​

The temperature and pressure of the left box is 250c (298 K), and 1 atm pressure.

The right box is at standard temperature and pressure.

Standard temperature and pressure is 00c (273.15 K) and 1 atm.

Hence, the pressure is the same, therefore the position is piston will be the same as the left figure.

At constant pressure, volume is directly proportional to absolute temperature.

\(V \propto T .\)

Now, as the temperature at the right box is less than 250c that of the left box, hence the volume decreases significantly.

The arrangement of molecules in the right box will be closer.

A diagram of the right box is given below.

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Answer:

chemistry, deposition occurs when molecules settle out of a solution. Deposition can be viewed as a reverse process to dissolution or particle re-entrainment. It is a phase change from the gaseous state to a solid, without passing through the liquid state, also called re-sublimation.

Explanation:

Examples include beaches, deltas, glacial moraines, sand dunes and salt domes. In severely cold temperatures frost will form on windows because the water vapor in the air comes into contact with a window and immediately forms ice without ever forming liquid water.

Answer:

4

Explanation:

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K(s) + 2HCl(aq) ----> 2KCl (aq) +H2(g) is an example of single replacement reactions.

A single-displacement reaction, also known as single replacement reaction or exchange reaction, is a chemical reaction in which one element is replaced by another in a compound.

Single-replacement reactions always involve two pure elements and one aqueous compound/solution. In the above reaction, the A and C would be pure elements.

A single replacement reaction, sometimes called a single displacement reaction, is a reaction in which one element is substituted for another element in a compound.

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Answer:

Explanation:

H+ = 1 X 10^-7.41 = 3.89 X 10^ -8

POH = 14-7.41 = 6.59

OH- = 1 x 10 ^-6.59 = 2.57 X 10^ -7

The [H+] and [OH−] concentrations of the solution are approximately 2.38 × 10^(-7) M, and the pOH is 6.59.

The pH of a solution is a measure of the concentration of hydrogen ions ([H+]) in the solution. The pH scale ranges from 0 to 14, with a pH of 7 considered neutral. A pH of 7.41 indicates that the solution is slightly basic. To calculate the [H+], [OH−], and pOH of the solution, we can use the relationship:

pH + pOH = 14

Given that the pH is 7.41, we can subtract it from 14 to find the pOH:

pOH = 14 - 7.41 = 6.59

Since pH + pOH = 14, we can also determine the [OH−] by taking the antilogarithm of the pOH value:

[OH−] = 10^(-pOH)

[OH−] = 10^(-6.59)

[OH−] ≈ 2.38 × 10^(-7) M

Since the solution is neutral, the concentration of [H+] will be equal to the concentration of [OH−]:

[H+] = [OH−] ≈ 2.38 × 10^(-7) M

Therefore, the [H+] and [OH−] concentrations of the solution are approximately 2.38 × 10^(-7) M, and the pOH is 6.59.

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The evidence suggests that almost all of the universe's nuclear matter is composed of hydrogen and helium. Hydrogen, the most prevalent element, makes up 74% of the mass, and helium makes up 25%. Less than 1% of the total is made up of heavier elements.

The hot, dense conditions of the universe's creation led to the production of the low-mass elements hydrogen and helium. Nuclear reactions are used to explain a star's conception, development, and demise. These reactions produced the chemical components that make up the matter we can see in the universe.

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Answer:

(c). You will have an excess of gas and the reaction will occur.

Explanation:

We can use the ideal gas law to calculate the number of moles of gas in each case. The ideal gas law is:

PV = nRT

where:

At STP, the pressure is 1 atm (101.325 kPa) and the temperature is 273.15 K. So, the number of moles of gas at STP is:

\(n =\frac{ PV }{ RT} =\frac{ (101.325 kPa)(22.4 L) }{(8.31 L-kPa/mol-K)(273K)} = 1mol\)

At 100 kPa and 373 K, the number of moles of gas is:

\(n =\frac{ PV }{ RT} =\frac{ (100 kPa)(45 L) }{(8.31 L-kPa/mol-K)(373 K)} = 1.45mol\)

So, you have 1.45 moles of gas at 100 kPa and 373 K. The reaction requires 1 mole of gas at STP, so you have an excess of 0.45 moles of gas. The excess gas will not participate in the reaction, but it will not prevent the reaction from occurring.

Therefore, the correct answer is (c). You will have an excess of gas and the reaction will occur.

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Answer:

name four agricultural inputs are subsidized by the government

0.297 kJ of heat is needed to raise the temperature of 10g of aluminum from 22 degrees Celsius to 55 degrees Celsius.

The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius.

It is a measure of how much energy it takes to raise the temperature of a substance. It is the amount of heat necessary to raise one mass unit of that substance by one temperature unit.

It is given by the formula -

                                                  Q = mcΔT

where, Q = amount of heat

m = mass

c = specific heat

ΔT = Change in temperature

Given,

mass = 10g

c = 0.901J/g⁰C

Initial temperature (T₁) = 22⁰C

Final Temperature (T₂) = 55⁰C

Q = mcΔT

= 10 × 0.901 × (55 -22)

= 297.33 J = 0.297 kJ

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Answer:

relative volatility.

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Answer: in temperature

Answer:

Definition. Gram molecular mass is the mass in grams of one mole of a molecular substance. Gram molecular mass is the same as molar mass. The only difference is that gram molecular mass specifies the mass unit to be used. Gram molecular mass may be reported in grams or grams per mole (g/mol).

It is the primary source which helps the students to relate in a personal way to events of the past and promote a deeper understanding of history as a series of human events. The primary source is better, because it contains more charts. The correct option is B.

The sources which are closest to the origin of the information and contain raw information which must be interpreted by the researches are called the primary sources. The secondary sources are closely related to the primary sources and often interpret them.

A direct access to the subject of our research is given by the primary source whereas the secondary source provides only second hand information and comments of other researches.

Thus the correct option is B.

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1) Physical change. A physical change affects the form of the substance, but the chemical composition remains the same. While in a chemical change, the composition of the substance changes. We can also say that in a chemical change a new substance is formed.

Freezing and boiling water, for instance, is a physical change. Ice is still water and vapor is still water. Water does not change in the process.

Dissolving. When we dissolve sugar in water, the sugar and the water remain the same. No new substances are formed.

Rusting. When a bar of iron rusts, a new substance is formed. This new substance is called iron oxide. Rusting is a chemical change.

How do we know a chemical change occurs?

There is a change in color, and odor or bubbles are formed.

.

Joules of heat are needed to raise the temperature of 100 g of iron from 23°C to 33°C, if the specific heat of iron is 0.45 J/g°C is 450 J.

Given that :

The specific heat capacity expression is given as :

Q = m cΔT

Q = heat energy

m = mass = 100 g

c = specific heat = 0.45 J/g °C

ΔT = change in temperature = 33  °C - 23  °C  =  10  °C

substituting the values in the formula:

Q = m cΔT

Q = 100 g × 0.45 J/g °C × 10 °C

Q = 450 J

Thus, Joules of heat are needed to raise the temperature of 100 g of iron from 23°C to 33°C, if the specific heat of iron is 0.45 J/g°C is 450 J.

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The name of the compound (CH3CH2)2COHCH3 is butane-2,3-diol.

The compound is an alcohol, which means it contains a hydroxyl (-OH) group. The prefix "butane-" indicates that it has four carbon atoms in a straight chain, and the suffix "-diol" indicates that it contains two hydroxyl groups. The prefix "2,3-" specifies the positions of the hydroxyl groups on the carbon chain.

Butane-2,3-diol is also known by other names, including 2,3-butanediol, 2,3-dihydroxybutane, and 1,4-butanediol. It is a colorless, viscous liquid that is used in the production of plastics, solvents, and other chemicals.

The name of (CH3CH2)2COHCH3​ compound is butane- 2,3- diol.

The organic substance 2,3-butanediol has the formula (CH3CHOH)2. It falls under the vic-diol category. It exists as a chiral pair, three stereoisomers, and a meso isomer. All liquids are colorless. Precursors for various polymers and insecticides are examples of applications.

A butanediol with hydroxylation at C-2 and C-3 is known as butane-2,3-diol. It is a secondary alcohol, a glycol, and a butanediol.

Among its many possible uses are the production of printing inks, perfumes, synthetic rubber, fumigants, antifreeze agents, fuel additives, foodstuffs, and pharmaceuticals. 2,3-Butanediol (2,3-BD) is a promising bulk chemical.

Alcohols classified as primary have just one alkyl group on which the carbon atom of the hydroxyl group (OH) is connected. These major alcohols include, for instance, ethanol, methanol (propanol),

Thus, The name of (CH3CH2)2COHCH3​ compound is butane- 2,3- diol.

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50 g of As\(_2\)O\(_3\) are titrated with 38.5 mL of KMnO\(_4\) to reach the end point. 0.26M is the concentration of the KMnO\(_4\)  solution.

Concentration in chemistry refers to the quantity of a material in a certain area. The ratio of the solute within a solution to the solvent or whole solution is another way to define concentration. In order to express concentration, mass in unit volume is typically used.

The solute concentration can, however, alternatively be stated in moles or volumetric units. Concentration may be expressed as per unit mass rather than volume.

5As\(_2\)O\(_3\)(s)+4MnO\(_4\)⁻(aq)+9H\(_2\)O(l)+12H⁺(aq)⟶10H\(_3\)AsO\(_4\)(aq)+4Mn\(_2\)⁺(aq)

the stoichiometry ratio between As\(_2\)O\(_3\) and MnO\(_4\)⁻ is 5:4

0.0126 moles of  As\(_2\)O\(_3\) will react with 4/5×0.0126 moles = 0.01008moles

0.01008moles of MnO\(_4\)⁻ is present in 38mL

concentration of KMnO\(_4\)= moles×volume

                                        = 0.010/38×1000

                                        =0.26M

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The percent composition of carbon in vinegar is 40.04%. This is because acetic acid is a molecule composed of four atoms 4 H, 2 C and 2 O atoms, with the molecular formula of acetic acid is \(CH3COOH\).

To calculate the percent composition of carbon in acetic acid, we must first determine the mass of each element in the molecule. The atomic mass of carbon is 12.011, the atomic mass of hydrogen is 1.008, and the atomic mass of oxygen is 15.999. When multiplied by their respective subscripts, we get the relative molecular mass of acetic acid as 60.046. Now that we know the relative molecular mass of acetic acid, we can calculate the percent composition of carbon by dividing the mass of carbon in the molecule (12.011) by the total molecular mass (60.046). This gives us 0.4004, which can be expressed as a percentage by multiplying it by 100 giving us 40.04%.

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The mass of water will be produced from 150 grams of iron (III) oxide is equal to 50.7 g.

A chemical equation depicts a chemical reaction in terms of symbols of the substances. A chemical equation consists of reactants participating, products, and their physical states.

The law of conservation of mass should be followed by a balancing of a chemical equation so that the number of atoms of substances is equal on either side of the equation is a balanced chemical equation.

Given the balanced chemical equation of the reaction of iron oxide and hydrogen:

\(Fe_2O_3 + 3H_2 \longrightarrow 2Fe + 3H_2O\)

Given, the mass of the iron oxide = 150 g

The number of moles of iron oxide = 159.69 g/mol

The number of moles of iron (III) oxide = 150/159.69 = 0.939 mol

One mole of iron (III) oxide produces water = 3 mol

Then 0.939 mol of iron (III) oxide produces water = 3 ×0.939 = 2.82 mol

The mass of water produced = 2.82 ×18 = 50.7 g

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Both Example A and Example B are correct, but they refer to different processes. Example A refers to the physical action of chopping vegetables into smaller pieces, which can make them easier to cook and eat.

This process does not change the fundamental nature of the vegetable, but simply alters its physical properties.

Example B, on the other hand, refers to the process of digestion in the human body. During digestion, food is broken down into simpler forms, such as sugars, amino acids, and fatty acids, which can be absorbed and used by the body for energy and other functions. This process involves both physical and chemical changes, as enzymes in the digestive system break down complex molecules into simpler ones.

In summary, Example A describes a physical process that alters the size and shape of a vegetable, while Example B describes a physiological process that breaks down complex food molecules into simpler forms for use by the body. Both processes are important for preparing and consuming nutritious food.

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INFORMATION:

We know that:

- 34.37 g of tin(IV) phosphate is added to 34.05 g of sodium carbonate

- 24.24 g of tin(IV) carbonate are made

And we must find the %yield

STEP BY STEP EXPLANATION:

Balanced equation:

Sn3(PO4)4 + 6Na2CO3 → 3Sn(CO3)2 + 4Na3PO4

1. We must find the amount of tin carbonate produced by tin phosphate

2. We must find the amount of tin carbonate produced by sodium carbonate

3. We must find the theoretical amount of tin carbonate produced

Since sodium carbonate is the limiting reactant, then the theoretical amount of tin carbonate produced would be

4. Finally, the %yield would be

ANSWER:

1.

2.

3.

4.

The amount of heat energy absorbed when 200 grams of water are heated from 20 C to 60 C is 33,440 Joules.

To find the amount of heat energy absorbed when 200 grams of water are heated from 20 C to 60 C, we can use the equation Q = mcAT.
First, we need to find the value of m, which is the mass of the water in grams. In this case, it is given as 200 grams.
Next, we need to find the value of AT, which is the change in temperature in degrees Celsius.

This can be calculated by subtracting the initial temperature from the final temperature, which gives us 60 C - 20 C = 40 C.
The specific heat capacity of water, C, is given as 4.18 Joules per gram per degree Celsius.
Now we can plug in the values into the equation:
Q = mcAT
Q = (200 g) x (4.18 J/g°C) x (40°C)
Q = 33,440 J
Therefore, the amount of heat energy absorbed when 200 grams of water are heated from 20 C to 60 C is 33,440 Joules.

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Out of the given choices, the amino acids that has a side chain that is capable of hydrogen bonding with other polar molecules is Ser (Serine).

In the fields of organic and biochemistry, a side chain is a chemical group that is connected to the "main chain" or backbone of a molecule and serves as an attachment point for other parts of the molecule. A molecule's side chain is a hydrocarbon branching element that is coupled to a larger hydrocarbon backbone. This element is known as the side chain. There is only one amino acid on this list that possesses a R group that is able to form a hydrogen bond, and that is serine.  Both serine and threonine have hydroxyl groups located on the side chains of their amino acids. Because these polar groups are located so close to the main chain, they are able to make hydrogen bonds with the main chain.

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The specific heat capacity of the metal, given that the metal was heated to 97 °C and transferred to water at 20.5 °C, is 0.203 Cal/gºC

We'll begin by obtaining the heat absorbed by the water. Details below:

Q = MCΔT

Q = 86 × 1 × 3.6

Q = 309.6 Cal

Finally, we shall determine the specific heat capacity of the metal. Details below:

Q = MCΔT

-309.6 = 20.9 × C × -72.9

-309.6 = -1523.61 × C

Divide both sides by -1523.61

C = -309.6 / -1523.61

C =  0.203 Cal/gºC

Thus, we can conclude that the specific heat capacity of the metal is 0.203 Cal/gºC

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Answer:

The ion-electron method involves breaking the reactants into their component ions and transferring electrons between the ions to balance the charge and the atoms. In a basic solution, the S²⁰⁸² ion will gain two electrons to form SO₂. The I¹⁻ ion will lose one electron to form I³⁻. The balanced redox equation using the ion-electron method is:

S²⁰⁸² + 2e⁻ + 2OH⁻ → SO₂ + H₂O

I¹⁻ + e⁻ → I³⁻

The overall balanced equation is:

2S²⁰⁸² + 2OH⁻ + I¹⁻ → 2I³⁻ + SO₂ + H₂O

Any substance made of matter is by definition a chemical, which includes solids, liquids, and gases. Pure substances or mixtures of substances can both be found in chemicals. Water (H2O), for example, is a pure chemical because the same molecules and molecular combinations are present throughout its whole structure.

Any material with a known composition is a chemical. Some chemicals, like water, are found in nature, meaning they always consist of the same "stuff." Other chemicals, including chlorine, are produced (used for bleaching fabrics or in swimming pools).

A chemical compound is a material that contains a specific combination of atoms or ions. Chemical compounds are made up of two or more elements coming together through a chemical process. While all substances are compounds, not all substances are compounds.

On its list of substances covered by the Toxic Substances Control Act, the EPA has more than 85,000 chemicals listed.

Not all chemicals are detrimental to the economy.

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The reaction can be said to be at equilibrium when the reaction rates of making products and using reactants are equal.

When the rates of the forward and reverse reactions are equal and the concentrations of the reactants and products don't change over time, a chemical reaction is said to be in equilibrium.

When the system reaches equilibrium, it is in a state of balance, which means that the concentrations of the reactants and products have not changed significantly.

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The mass of the iron is 17.64 kg.

To solve this problem, we need to use the principle of heat transfer, which states that the total heat gained by one object must be equal to the total heat lost by the other object when they are in thermal equilibrium.

Let's start by calculating the heat lost by the iron and the heat gained by the water. We can use the following formula:

Q = m×c×ΔT

where Q is the heat transferred, m is the mass of the object, c is its specific heat capacity, and ΔT is the temperature change.

Heat lost by iron = Heat gained by the water

\(m_{iron}\) x \(c_{iron}\) x ( \(T_{f}\) - \(T_{i}\) ) = \(m_{water}\) x \(c_{water}\) x ( \(T_{f}\) - \(T_{i}\) )

where \(T_{f}\) is the final temperature of the system (30°C), \(T_{i}\) is the initial temperature of each substance (120°C for the iron and 20°C for the water), \(c_{iron}\) and \(c_{water}\) are the specific heat capacities of iron and water, respectively.

We need to solve for \(m_{iron}\), which is the unknown mass of iron. Rearranging the equation, we get:

\(m_{iron}\) = (\(m_{water}\) x \(c_{water}\) x (\(T_{f}\) - \(T_{i}\) )) / (\(c_{iron}\) x (\(T_{i}\) - \(T_{f}\) ))

Substituting the given values, we get:

\(m_{iron}\)= (750g x 4.18 J/g°C x (30°C - 20°C)) / (0.45 J/g°C x (120°C - 30°C))

\(m_{iron}\)= 17,640 g = 17.64 kg (to two decimal places)

Therefore, the mass of the iron is 17.64 kg.

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Answer:

low power objective lens

Explanation:

b/c the stage could hit the high power objective and easily dissenter the specimen

In this figure, four shapes contains the same text as in the red oval. The text given in the red oval is KTKEIHLPEQMKJAPDEK.

Shape is "the form of an object or its outline, outer boundary or outer surface".

Text is "a collection of words or letters that are understandable by the reader".

Oval is a rounded and slightly elongated outline or shape like that of an egg.

Hence, four shapes contains the same text as in the red oval.

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