Charles's law describes the relationship of the volume and temperature of
gas at a constant mass and pressure. According to this law, what would
happen to the volume of the gas if its temperature decreased from 400 K to
300 K?
O
A. The volume would be 4/3 of its original value.
B. The volume would decrease from 400 mL to 300 mL.
O
C. The volume would increase by 100 mL.
O
D. The volume would be 3/4 of its original value.

Answer:

1. A mole is the amount which contains as many elementary particles as there are atoms in 12 grams of carbon-12. It is also the unit used in measuring the amount of matter. A mole also refers to the Avogadro's number of particles present in any substance.

2. 1mole of NaOH contains 6.02x10^23 atoms.

Therefore, 3.8 moles of NaOH will contain = 3.8 x 6.02x10^23 = 2.288 x 10^24 atoms

3. Molar Mass of Ca(OH)2 = 40 + 2(16+1) = 40 2(17) = 40 + 34 = 74g/mol

Explanation:

During the light reaction of photosynthesis Water molecules split apart.

1. Water molecules split apart

Explanation:

Photosynthesis is the method by which plants, some bacteria and some protistans, a eukaryotic organism utilise the energy from daylight to generate  Water molecules split apart. This can be turned into pyruvate which issues adenosine triphosphate (ATP) by cellular breath. This light initiated chlorophyll will part the water particle. This procedure is called Photolysis. Water atom is part to discharge H+ particles and furthermore oxygen.

Answer:

1.Water molecules split apart

Explanation:

Photosynthesis occurs in two stages.; Light phase and dark phase.

During the light phase, water molecules split apart when sunlight reaches them to produce hydrogen and oxygen together with electrons that enter into the electron transport chain. This is known as the photolysis of water.

This is the first stage of photosynthesis. The products of this reaction are involved in the dark stage of photosynthesis which occurs in the absence of sunlight.

Answer:

Im bad at these questions but i think the answer is SrBr2

Explanation:

The steepness of a line is measured by finding its absolute value of slope.

Absolute value is defined as to ignore any minus sign before an integer and consider all numbers positive (or zero). One way to think about a number's absolute value is as its distance from zero. The difference between two numerical numbers, whether positive or negative. Therefore, the absolute difference doesn't reveal anything about relative magnitude.

The steepness, incline, or grade of a line can be measured using the slope's absolute value. A slope with a larger absolute value denotes a steeper line. There are four possible directions for a line: up, down, horizontal, or vertical. If a line is horizontal, it has no slope.

Thus, the steepness of a line is measured by finding its absolute value of slope.

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Answer:

groups

Explanation:

periods are left and right groups are up and down

Answer: Groups

Explanation:

Answer: A

Explanation:

The price increased over time, because the numbers underneath the Y Axis Points increase as times goes on.

a. Krish's container is heavier than Raunak's container.

b. Both container have the same number of atoms.

Explanation:

The molar mass of any element is equivalent to one mole of that substance.

weight of 1 mole of carbon atom is 12 g and weight of 1 mole of sodium atoms is 23 g.

So, the mass of 5 moles of carbon atoms

12 x 5 = 60 g

In this same way,

the mass of 5 moles of sodium atoms

23 x 5 = 115g

From this, we can say that Krishna’s container is heavier.

b. One mole of a carbon atom has 6.022 x 10^23 atoms and one mole of sodium also has 6.022 x 10^23 atoms.

So, 5 moles of carbon and sodium contains the same number atoms which are

5 x 6.022 x 10^23

= 3.011 x 10^24 atoms.

Answer: This is true because kinetic energy depends on speed. If there's no speed, then there is no kinetic energy.

Answer: 1.29 x 10^24 Particles

Explanation: 1mole of gold contains 6.02x10^23 Particles

Therefore, 2.15 moles of gold will contain = 2.15 x 6.02x10^23 = 1.29 x 10^24 Particles

The number of ⁶Li atoms present is 1.23 × 10²⁴ atoms

From the question, we are to determine the number of ⁶Li atoms present.

First, we will determine the number of moles of ⁶Li present.

Using the formula,

[tex]Number\ of\ moles = \frac{Mass}{Molar\ mass}[/tex]

Mass of ⁶Li = 12.3 g

Molar mass of ⁶Li = 6 g/mole

Number of moles of ⁶Li present = [tex]\frac{12.3}{6}[/tex]

Number of moles of ⁶Li present = 2.05 moles

Now, for the number of atoms

Using the formula,  

Number of atoms = Number of moles × Avogadro's constant

Then

Number of atoms of ⁶Li = 2.05 × 6.022×10²³

Number of atoms of ⁶Li = 1.23451 × 10²⁴ atoms

Number of atoms of ⁶Li ≅ 1.23 × 10²⁴ atoms

Hence, the number of ⁶Li atoms present is 1.23 × 10²⁴ atoms

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Answer:

2HBr + Mg(OH)2 => MgBr2 + 2 H2O

Explanation:

To balance the equation HBr + Mg(OH)2 -> MgBr2 + H2O, we need to ensure that the number of atoms of each element is the same on both sides of the equation.

2HBr + Mg(OH)2 -> MgBr2 + 2H2O

The balanced equation for the reaction between hydrobromic acid (HBr) and magnesium hydroxide (Mg(OH)2) to form magnesium bromide (MgBr2) and water (H2O) is 2HBr + Mg(OH)2 -> MgBr2 + 2H2O.

This equation shows that two moles of HBr react with one mole of Mg(OH)2 to produce one mole of MgBr2 and two moles of H2O. The equation is balanced by adjusting the coefficients to ensure an equal number of atoms of each element on both sides of the equation.

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Answer:

FALSE!!

Explanation: some substances like gas or liquid do not have a definite composition/shape

The statement is true. A substance is matter that has a definite composition.

The statement 'A substance is matter that has a definite composition' is TRUE.

In Chemistry, a substance is defined as matter that has a specific and definite composition. This means that a substance is made up of specific types and amounts of atoms or molecules. Examples of substances include water (H2O), salt (NaCl), and oxygen (O2).

Understanding the concept of substances is important in Chemistry because it helps us classify and identify different types of matter based on their composition.

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Gathering evidence is best exemplified by taking pictures from the given choices. This action collects objective, verifiable visuals to support a claim, argument, or observation.

Out of the listed options, the best example of gathering evidence is option B:

Taking Pictures

. Gathering evidence refers to the collection of objective information, data, or proofs to support a claim or thesis. For instance, a nature photographer illustrating the impact of climate change might gather evidence by

taking pictures

of receding glaciers or drought-stricken areas. Therefore, in the context of creating arguments or conducting research, taking pictures can represent factual visuals that substantiate a position or perspective.

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Answer: 0.35 mole SF6

Explanation: Use ideal gas equation

Solution Attached.

At STP

Pressure = 1 atm

Temperature = 1°C + 273 = 273 K

PV= nRT derive to find n

n= PV / RT

= 1 atm x 7.9 L / 0.08205 L.atm

/mol K x 273 K

= 0.35 mole SF6

Answer:

42.1 kj

Explanation:

Given data:

Molar heat of vaporization = 3.86×10⁴ j/mol

Mass of ethanol = 50 g

Amount of heat required to convert into gaseous form = ?

Solution:

First of all we will calculate the number of moles of ethanol.

Number of moles = mass/ molar mass

Number of moles = 50.0 g/ 46.07 g/mol

Number of moles = 1.09 mol

H(vap) = number of moles × molar heat of vaporization

H(vap) =  1.09 mol × 3.86×10⁴ j/mol

H(vap) = 4.21×10⁴ j

In Kj:

4.21×10⁴ / 1000 = 42.1 kj

Answer:she did not do it in the correct order

Explanation:

Lisa violated several lab safety rules. Here are the specific safety protocols that Lisa failed to follow:

1. Wearing a lab coat: Lisa was not wearing a lab coat, which is essential personal protective equipment (PPE) in a laboratory setting. Lab coats protect the skin and clothing from spills and splashes of hazardous substances.

2. Wearing gloves: Lisa did not have gloves on when handling the chemical. Gloves are necessary to prevent skin contact with chemicals, which could cause irritation, burns, or be absorbed through the skin.

 3. Wearing safety goggles: Lisa was not wearing safety goggles. Eye protection is crucial to prevent injury from chemical splashes, vapors, or flying objects.

4. Proper disposal of broken glassware: Lisa placed the broken glassware in the regular trash bin. Broken glassware should be disposed of in a designated sharps container to prevent injury to others who may come into contact with the trash.

5. Proper storage of chemicals: Lisa returned the bottle of acetone to the wrong shelf. Chemicals should always be stored in their correct, designated locations to prevent incompatibility reactions (e.g., mixing of acids and bases, oxidizers and flammables) that could lead to fires, explosions, or the release of toxic fumes.

 6. Leaving the fume hood open: Lisa left the sash of the fume hood open. The sash should be closed to the proper working level to contain and exhaust fumes and vapors from the laboratory.

7. Using a spatula to transfer chemicals: Lisa used a metal spatula to transfer a solid chemical. Depending on the reactivity of the chemical, a metal spatula could introduce contamination or react with the chemical. It is important to use the appropriate tool for the task, often a plastic or ceramic spatula for corrosive substances.

 8. Ignoring the chemical's label: Lisa did not read the label on the chemical bottle before use. It is essential to read and understand the labels and safety data sheets (SDS) for all chemicals to be aware of their properties, hazards, and handling procedures.

 9. Not using a pipette bulb or pipette filler: Lisa used her mouth to pipette the solution, which is extremely dangerous. Using the mouth to pipette can lead to ingestion or inhalation of hazardous chemicals. Instead, a pipette bulb or a mechanical pipette filler should be used.

 10. Not securing her hair: Lisa's hair was not tied back or covered, which can be a hazard near open flames or when working with volatile chemicals. Hair should be secured to prevent it from catching fire or coming into contact with hazardous materials.

 In summary, Lisa's actions in the lab were not in compliance with standard laboratory safety practices, which are designed to protect her and others from potential harm. It is critical for anyone working in a laboratory to adhere strictly to safety guidelines to minimize the risk of accidents and exposure to hazardous materials."

Answer:

1. Univalent negative ion (Cl-)

2. Divalent negative ion (O2-)

3. Divalent positive ion (Mg2+)

4. Divalent negative ion (S2-)

5. Divalent negative ion (CO3)^2-

6. Univalent negative ion (NO3) ^-

Answer:

Magma convection moves heat from Earth’s deep interior up to the crust, where it can be used to produce energy.

Explanation:

Magma convection aid in the production of geothermal energy is that Magma convection moves heat from Earth’s deep interior up to the crust, where it can be used to produce energy.

It is a type of energy which is having its source from the crust of the earth that is is is mainly given by the earth's crust

This originates from the formation of planets and radioactivity. The high temperature and pressure in Earth's interior cause some rock to melt and the solid mantle to behave plastically.

This results in parts of the mantle convicting upward since it is lighter than the surrounding rock.

Mostly used in electricity production in geothermal plants. a distinction is made between two different types of geothermal: direct use and indirect use.

Therefore, it is geothermal energy.

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Answer:

4.567x10^-5ML

The ML [tex]4.567[/tex] × [tex]10^4mL[/tex] equals the [tex]4.567[/tex] × [tex]10^-5 ML[/tex]

Given that,

 [tex]4.567[/tex] × [tex]10^4mL[/tex]

To find,

Number of [tex]ML[/tex] in [tex]4.567[/tex] × [tex]10^4mL[/tex] = ?

Procedure:

As we know,

[tex]mL[/tex] is characterized as a fraction unit of volume

[tex]ML[/tex] is volume's manifold unit.

[tex]mL = 10^-3 L[/tex]

[tex]ML = 10^6 L[/tex]

Therefore,

[tex]1 L = 1000 mL[/tex] & [tex]1 ML = 1000000L[/tex]

Using this formula,

[tex]4.567[/tex] × [tex]10^4mL[/tex] into [tex]ML[/tex]

=  [tex]4.567[/tex] × [tex]10^4mL[/tex] × [tex]1L/1000mL[/tex] × [tex]1ML/1000000L[/tex]

= [tex]4.567[/tex] × [tex]10^-5 ML[/tex]

Thus,  [tex]4.567[/tex] × [tex]10^4mL[/tex] equals the [tex]4.567[/tex] × [tex]10^-5 ML[/tex].

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Answer: 3.41 mL

Explanation: Solution:

Use Combine gas law to solve this problem.

P1V1 / T1 = P2V2 / T2

First convert temperature to K

T1 = 47 °C + 273 = 320 K

T2= 107°C + 273 = 380 K

Derive to find V2:

V2 = P1 V1 T2 / T1 P2

Substitute the values:

V2= 1.03 atm x 2.20 mL x 380 K /

320 K x 0.789 atm

= 3.41 mL

Cancel out the units of atm and K so the remaining unit is in mL.

Using the combined gas law equation, we can find the new volume of a gas given its initial volume, temperature, and pressure.

To solve this problem, we can use the combined gas law equation: PV/T = constant. Since the volume, pressure, and temperature of the gas change, we can set up the equation as follows: (1.03 atm)(2.20 mL)/(47°C) = (0.789 atm)(V2)/(107°C). We can then solve for V2 to find the new volume of the gas.

Using this equation, we can rearrange it to:

V2 = (1.03 atm)(2.20 mL)(107°C)/(0.789 atm)(47°C)

Calculating the values, we find that V2 is approximately 4.61 mL.

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Answer:

D

Explanation:

A would be. space ship

Answer:

D.Physical science

Explanation:

Answer Option c. between gases should in all cases be extremely rapid because the average kinetic energy of the molecules is great.

Answer:

                    % age Composition of Calcium = 36 %

                     % age Composition of Chlorine = 64 %

Explanation:

                    Percent composition can be defined as the relative amounts of each element in a compound. It is calculated as,

% age Composition = Mass of element / Mass of compound × 100

Given Data:

                  Mass of Calcium  =  0.90 g

                  Mass of Chlorine  =  1.60 g

                  Mass of Compound  =  2.50 g

Calculating %age composition of Calcium:

% age Composition = Mass of Calcium / Mass of compound × 100

% age Composition = 0.90 g / 2.50 g × 100

% age Composition = 36 %

Calculating %age composition of Chlorine:

% age Composition = Mass of Chlorine / Mass of compound × 100

% age Composition = 1.60 g / 2.50 g × 100

% age Composition = 64 %

Answer: Copper (II) Sulphate is soluble in water.

Explanation: CuSO4 is an ionic salt that is attracted to polar molecules such as water. So it makes it dissolve in water but it takes more time so increasing the temperature of water increases the dissociation process.

in short yes copper is soluable

Answer:

fault-block mountain

Explanation:

Answer:

Most of us use the word 'heat' to mean something that feels warm, but science defines heat as the flow of energy from a warm object to a cooler object.

Explanation:

Heat energy is the result of the movement of tiny particles called atoms, molecules or ions in solids, liquids and gases.

At a molecular level, heat is the transfer of energy that makes use of or stimulates disorderly molecular motion in the surroundings.

Heat, is defined as the transfer of thermal energy until equilibrium is reached, measured in joules. It is distinct from temperature, which measures average kinetic energy per molecule and does not involve energy transfer.

The scientific definition of heat is the amount of thermal energy that is transferred between systems or objects with differing temperatures. This transfer of thermal energy occurs until thermal equilibrium is reached, meaning no net flow of thermal energy between the systems.

Unlike temperature, which is measured in degrees, heat is quantified in joules (J), a unit that measures energy. The concept of heat is central to the field of thermodynamics, which studies the relationships between heat, work, and energy. An everyday example of heat transfer is when you drink hot coffee; the heat from the coffee transfers to your mouth, causing it to warm up.

Answer: Boyle's law

Explanation: Boyle's law states that the volume of a mixed mass of gas is inversely proportional to the pressure provided the temperature remains constant. This can be stated mathematically as

P1 V1 = P2 V2

Answer: 2.17 x 10^23 molecules

Explanation:

1mole of H2O contains 6.02x10^23 molecules.

Therefore 0.360mole of H2O will contain = 0.36 x 6.02x10^23 = 2.17 x 10^23 molecules

There are approximately 2.16792 × 10^{23} water molecules in 0.360 mole of water, calculated by multiplying the moles by Avogadro's number.

we need to use Avogadro's number, which is 6.022 × 10^{23} molecules per mole. We multiply the number of moles by Avogadro's number to find the total number of molecules.

Calculation:

Therefore, 0.360 mole of water contains approximately 2.16792×  10^{23} water molecules.

Answer:

3.5g/{molar mass of silver}

3.5g/(107.86g/mol)

now we have 0.03244mol of silver

The statement of the moles of silver is "0.0324 mol."

The mole is a SI unit of measurement that is used to determine the amount of any substance that need to be given in mol. The mole is the amount of substance in a system that has the same number of fundamental entities as atoms in 0.012 kilogramme of carbon 12.

In order to determine the moles, divide the mass of the substance by its molar mass to convert grams into moles.

Grams to moles conversion factor,

[tex]Grams\;.\;\frac{1\;mol}{grams}\;=\;Moles[/tex]

Moles of silver comes out to be,

[tex]=\frac{Grams}{molar\;mass} \\= 3.50\;g\;.\;\frac{1\;mol}{107.86\;g} \\= 0.0324\;mol[/tex]

Hence the correct answer is 0.0324 g of Ag.

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