A gas at 91 c occupies a volume of 0.67 L at what Celsius temperature will the volume increase to 1.37 L

Answer:

[tex] \huge{ \boxed{2.39 \times {10}^{24} \: \text{atoms}}}[/tex]

Explanation:

To find the number of entities in a given substance we use the formula

[tex] \bold{N = n \times L} [/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question;

n = 3.98 mol

N = 3.98 × 6.02 × 10²³ = 2.39 × 10²⁴

We have the final answer as

[tex] \bold{2.39 \times {10}^{24} \: \text{atoms}}[/tex]

Answer: Single-celled eukaryotic organisms.

Explanation:

Answer:

A

Explanation:

A

Answer: 0.295g

Explanation: The answer is 0.295g. Normally you would start by checking which of your reactants is the limiting reactant, but since you have excess HCl, you don't need to worry about that. Start by converting grams of iron to moles (done by dividing grams by iron's molar mass).

Next, you convert moles Fe to moles H2 by checking the coefficients in front of Iron and H2. Divide by iron's coefficient and multiply by H2's

Finally, you multiply by the molar mass of H2. To find it, multiply the molar mass of hydrogen by 2.

Easy way to read it:
5.45/44.845 x 3/2 x 2(1.008) = 0.295

The volume of the sample in milliliters is 1.0 ml and number of moles of gold dissolved in 1 ml of sea water is 2.5×10[tex]^-14[/tex] moles  which is mentioned in the question and 1 mole of substance has 6.023×10²³ particles.

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.

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Answer:

ionec ,covalent ,molecular

The percentage composition of oxygen (O) in the compound, given that it contains 19.76 g of O is 39.52%

The percentage composition of substance in a compound can be obtained by using the following formula:

Percentage = (mass of substance / mass of compound) × 100

Using the above formula, we can determine the percentage composition of the oxygen (O) as illustrated below:

Percentage = (mass of solute / mass of solution) × 100

Percentage of O = (19.76 / 50.0) × 100

Percentage of O = 39.52%

Thus, we can conclude that the percentage composition of the O is 39.52%

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Answer:

Suppose you are standardizing a sodium hydroxide solution with KHP

(molar mass=204.2 g/mol) according to the equation

KHP+NaOH⟶H2O+NaKP

You prepare the standard solution from 0.303 g of KHP

in 250.0 mL of water. You then require 9.51 mL of NaOH

solution to complete the titration.

What is the concentration of the NaOH

solution?

Answer:

The concentration of the NaOH solution can be calculated using the following equation:

Concentration (M) = (Moles of KHP/Volume of NaOH solution) x (Molar mass of KHP/1000)

Concentration (M) = (0.303 g/9.51 mL) x (204.2 g/mol/1000)

Concentration (M) = 0.064 M

The two which she should use to check whether the sublimation of camphor would reduce if pepper seeds are placed along with it are P and S and is denoted as option C.

This is referred to as the transition of a substance directly from the solid to the gas state, without passing through the liquid state and an example is iodine crystal.

Options P and S are both open boxes and one contains only camphor while the other contains camphor and pepper seeds which is used to compare their rate of sublimation to know if the addition of the seeds caused a reduction.

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As you can see the picture, in the three given compounds i.e. ethane, ethene and ethyne, ethyne have shortest bond. Bond length of ethyne is very short when compared to the ethane and ethene. Shorter the bond, bond strength will be more. Hence, our answer is ethyne.

Answer:

ethyne has shortest bond

The reaction that would not occur based on the electrochemical series is; FeCl₂ + Br₂ →

When we talk about the activity series, we need to be thinking about the ease with which elements react. If we are dealing with the metals we have to talk about the ease with which the metals are able to loose one or more electrons.

If we are dealing with the non metals, we have to look out how easily that the element is going to be able to accept one or more electrons. It is also clear that an element can only be able to any element that is below it in the periodic table of the elements.

We would now have to look at the replacements reaction to know the one in which a lower element in the series is reaction with a higher one. Armed with the knowledge of the table it is clear that bromine can not replace chlorine from its salt.

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toThis is a Valid statement about pressure .

What is pressure?

Pressure is continues physical force exerted on or against an object by something in contact with.

Sol-We know the idol gas equation, idyl gas equation. P v is equals to n r t. We can write the equation. As of the p is equal to n r upon v into p. Now n r upon v is equals to constant, is equals to constant. So we can write. P is equal to c into t. So now let us consider the ambient by the  condition, which is p not equals to 101325 p. A and t naught is equal to 90 degrees. Fahrenheit will convert this value kelvin and get 5048.37 kelvin. So the value of p, not anti. Note is 0 now from the modified idol equation. We are have p equal to c t, so we can write it as a p. Not is equal to c and t not so the we'll substitute the values 1013 to 5 p, a which is equal to c 2348.37 kelvin.

So here we get the value of c, which is equals to 43.147. So from this we can say that the change by  in pressure for the 10 degree temperature by the  drops so here delta equal to delta, which is equal to the 10 degrees fahrenheit. We can again convert this value in the kelvin and we get 260.93 kelvin, so delta to  p is equal to c into delta. This will be delap equals to 43.147, as we get the value of c and 2 red 60.93 kelvin p, so delta p is equal to 43.147 So from this we can say We can again convert this value in the kelvin by it  and we are get the 260.93 kelvin, so delta p is equal to c into delta. This will be delap equals to 43.147, as we get the value of c and 2 red 60.93 kelvin p, so delta p is equal to 43.147 and 260.93 kelvin upon 694.75 p s. I so we are finally get the value of delta p, which is equals to 1.63 p s. I.

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The test variable (independent variable) in Omar's experiment is the masses of the model rockets; option D.

Variables in an experiment refer to those measurements or factors that are under the control of the researcher and which can be altered by the researcher in order to study the effect of changes on the study.

The three types of variables in a study are:

In the study conducted by Omar, the test variable (independent variable) is the time of rocket stays up in the air.

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By dividing the number of moles by the number of litres of water utilised in the solution, we can compute the molar concentration. Ca2+ is present in the initial CaCl2 solution at a 42 mEq/L concentration.

Molar concentration is defined.

Molarity, which is stated as the quantity of substance per unit volume of solution, is a measurement of the concentration of a chemical species, particularly a solute, in solution.

As a result, to determine the molar concentration, we will divide the number of moles by the number of litres of water used in the solution. Ca2+ is present in the initial CaCl2 solution at a 42 mEq/L concentration.

equation:-

[tex]1 :1 stoichiometry, 36.8mL of 1.69 EDTA solution.[/tex]

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The following which best describes the number of atoms for each element in the chemical reaction C₆H₁₂0₆ +60₂---> 6H₂0 + 6CO₂ is that there are 6 carbon atoms, 12 hydrogen atoms and 18 oxygen atoms on the reactant side and 6 carbon atoms, 12 hydrogen atoms and 18 oxygen atoms on the product side which is therefore denoted as option B.

This is referred to as the representation of a chemical reaction in the form of symbols and formulae and depicts the elements or compounds which are involved.

According to the law of conservation of mass, the masses and elements of the products and reactants must be the same which is therefore why the total number of elements of carbon, hydrogen and oxygen on the reactant and product side are equal.

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The full question is:

A model of a chemical reaction is shown below C₆H₁₂0₆ +60₂---> 6H₂0 + 6CO₂. Which of the following best describes the number of atoms for each element in the chemical reaction?

The most well-known feature of mica is arguably their flawless cleavage into thin elastic sheets. The sheet structure mentioned manifests as the cleavage.

The silicate mineral family known as micas is distinguished by the ease with which individual mica crystals can break into incredibly thin, elastic plates. Perfect basal cleavage is the term used to describe this feature.

Mica is very reflective and has good cleavage, which allows it to separate into thin, resilient sheets that are the mineral group's defining feature. Thin sheets are translucent or transparent if they are deeply colored.

Thus, The most well-known feature of mica is arguably their flawless cleavage into thin elastic sheets.

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Answer:

Explanation:

1. No, I simply would not feel safe.

2. Power plant manager

3. exposure to chemicals

Answer:

Alkali gases

Explanation:

Noble gases - Group 18

Alkaline Earth Metals - Group 2

Transition metals - Group 3 - 12

Alkali gases do not exist on the periodic table

Answer:

I got it right on Pluto

Explanation:

You are pretty much just taking away 2 of the hydrogen

Answer: Mesopotamia

Civilizations first appeared in Mesopotamia (what is now Iraq) and later in Egypt. Civilizations thrived in the Indus Valley by about 2500 B.C.E., in China by about 1500 B.C.E., and in Central America (what is now Mexico) by about 1200 B.C.E. Civilizations ultimately developed on every continent except Antarctica.

Hope this helps!

She found out that the gypsum block with the water balloon cracked while the other block did not.The water in the balloon freezes and expands, just like the water in the cracks of rocks - is this similar to the weathering of rocks by ice.

Gypsum is a soft sulfate mineral that is made up of calcium sulfate dihydrate and has the chemical formula CaSO₄ . 2H₂O. It is extensively mined, and used as fertilizer, the primary ingredient in many types of plaster, sidewalk or blackboard chalk, and drywall, and it is also widely utilized as a building material.

In nature, water flows from small rivers and occasionally through fissures in the rocks or terrain, and when it freezes, it puts too much pressure on the rock, causing it to split. The similarity in Jades' test is that the water balloon has water when it is placed in the gypsum, and when she adds a cold environment, the ice within the water balloon freezes and expands, putting too much pressure on the rock, causing it to shatter.

Ice Wedging is a example of this.

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The moisture from a hydrated salt can be removed through normal heating. But the water of crystallization is incorporated within the crystal structure of the salt and difficult to remove.

The water of crystallization is the  water molecules that make up a salt crystal's structure. The water of crystallization is water that has chemically joined with a crystal structure.

The entire amount of water in a crystal at a specific temperature is known as the water of crystallization, and it often exists in a specific ratio in various contexts. A metal complex's crystalline structure contains water, as does a salt that isn't chemically connected to the metal cation.

Therefore, the water content inside the crystal lattice of the salt needs more heat  energy to be removed.

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Elements that are chemically similar to calcium (Ca) can interfere with bodily functions are Beryllium and magnesium.

The chemical element calcium has the atomic number 20 and the letter Ca as its symbol. Calcium is an alkaline earth metal that reacts with air to create a black oxide-nitride coating. Its heavier homologues barium and strontium are most similar to it in terms of physical and chemical characteristics.

Calcium reacts when heated with boron, carbon, sulfur, phosphorus, halogens, and hydrogen. Calcium is more expensive and less reactive than sodium, despite being a better reducing agent than the latter.

Thus, Elements that are chemically similar to calcium (Ca) can interfere with bodily functions are Beryllium and magnesium.

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According to stoichiometry and balanced chemical equation  10 moles of lithium metal react to yield 5.00 mole of hydrogen gas.

Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.

In the  balanced chemical equation as 2 moles of lithium produce 1 mole of hydrogen.

∴for 5 moles of hydrogen to be liberated,5×2/1=10 moles of lithium are required.

Thus, 10 moles of lithium are required to react to yield 5 moles of hydrogen gas.

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Answer:

Cl2 + 2 e- or E

Explanation:

MnO₄⁻ + 8CL⁻ → Mn²⁺ + 4CL₂  is the balanced equation for given reaction.

The balanced equation for MnO₄⁻ + CL⁻ → Mn²⁺ + CL₂  is

= MnO₄⁻ + 8CL⁻ → Mn²⁺ + 4CL₂

Each element has an equal number of atoms on both sides thanks to the balancing process. Eight chloride ions are needed to produce the four chlorine molecules necessary to maintain equilibrium between the oxygen and chlorine atoms on the left. By following the law of conservation of mass, this equation makes sure that no atoms are created or destroyed during the chemical reaction.

permanganate ion MnO₄⁻ reacts with chloride ion CL⁻  to yield manganese(II) ion and chlorine gas (Mn²⁺ + CL₂).

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The charge on the elements when they form ions would be as follows:

The charges formed by ions of elements depend primarily on the valence electron of the atoms of the element. In other words, the charges on ions of elements depend on the number of electrons in the outermost shell of the atom of the element.

Every element move towards assuming an octet state, a state of completely filled outermost shell with 8 electrons. Thus, atoms tend to either readily donate or accept electrons in order to assume an octet state.

Thus:

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The pressure will increase on increasing the temperature of container. is the correct answer

What is pressure ?

Pressure is a measure of the force applied perpendicular to a surface per unit area. The unit of pressure in the International System of Units (SI) is the pascal (Pa), but other units, such as atmospheres (atm), bar, torr, and pounds per square inch (psi), are also commonly used, depending on the context. Pressure can be generated by many different sources, including the weight of a column of a fluid, the compression of a gas, and the tension in a solid object. In physics and engineering, pressure is often used to describe the state of a fluid in a container, such as a gas in a cylinder or a liquid in a tank. In this context, pressure is related to the height of the fluid column and the density of the fluid.

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Answer:

[tex] \huge{ \bold{ \text{8.31 moles}}}[/tex]

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex] \bold{n= \frac{N}{L}}\\ [/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question

N = 5.0 × 10²⁴ [tex] K_2SO_4 \: \text{formula units} [/tex]

[tex] \: n = \frac{5 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 8.3056[/tex]

We have the final answer as

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, there are 8.41×10⁻¹⁸moles of oxygen in 5.07x10⁶atoms of oxygen.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance.

Given number of atoms= 5.07x10⁶atoms

we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

mole =given number of atoms ÷ 6.022×10²³(Avogadro number)

Substituting the values

mole of oxygen=5.07x10⁶÷ 6.022×10²³

mole of oxygen =8.41×10⁻¹⁸

Therefore, there are 8.41×10⁻¹⁸moles of oxygen in 5.07x10⁶atoms of oxygen.

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