If a sample of air initially occupies 240L at 2 atm how much pressure is required to compress it to 20L at constant temperature

In the above intermediate chemical equation, oxygen will appear as follows: O₂(g) as a reactant (option B).

A chemical equation in chemistry is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.

According to this question, an intermediate chemical equation is presented as follows:

As observed in the above chemical equation, oxygen will react in its gaseous form i.e. as a reactant.

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Answer:

b

Explanation:

b

Among the given options, the statement that best describes mechanical weathering is "1. When rocks are exposed to hot and cold temperature."

Mechanical weathering refers to the physical breakdown of rocks without changing their chemical composition.

In this process, rocks are subjected to changes in temperature, which cause them to expand and contract. Over time, this repetitive process of heating and cooling causes the rocks to crack and break apart. This process is also known as thermal stress.

The other statements do not describe mechanical weathering. Statement 2 describes weathering by oxidation or rusting, statement 3 describes weathering due to human activities, statement 4 describes weathering due to quarrying and blasting, and statement 5 describes weathering due to the growth of plants and their roots.

In summary, statement 1 describes mechanical weathering, which is caused by temperature changes, while the other statements describe different types of weathering caused by various factors.

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Since the electrons in metals are shared across all of the metal atoms in the sample as "sea of electrons" which surrounds the metal ions, making metals more malleable and ductile than ionic and covalent substance.

A metallic composition of all metal atoms surrounds the metal ions with a "sea" of shared electrons. It is assumed that this electron sea is the source of the great conductivity, malleability, and ductility that make metals unique.

Metal ions can easily pass by one another and twist the metal without breaking it because of the electron sea in a metallic body. On the other hand, it is more challenging to modify ionic and covalent molecules without rupturing the bonds due to the strong chemical bonds that hold them together. Because of this, ionic and covalent compounds are less ductile and malleable than metals.

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Answer:

See explanation

Explanation:

1) Physical change is usually reversible, while chemical change isn't

2) Chemical change involves the change of chemical composition of matter while physical change doesn't

Answer:

1. Physical changes only change the physical attributes of a substance, such as color or state, while chemical changes affect chemical composition.

2. In physical changes, no new energy or substances are produced.

Explanation:

Answer:

To determine the volume of oxygen gas needed to make an optimum mixture with 5 mL of hydrogen gas, we need to know the ratio of hydrogen to oxygen in the mixture.

The optimum ratio of hydrogen to oxygen for combustion is 2:1 by volume. This means that for every 2 volumes of hydrogen gas, we need 1 volume of oxygen gas.

Therefore, to calculate the volume of oxygen gas needed to make an optimum mixture with 5 mL of hydrogen gas, we can use the following formula:

volume of oxygen gas = (volume of hydrogen gas) / 2

Plugging in the values, we get:

volume of oxygen gas = (5 mL) / 2

volume of oxygen gas = 2.5 mL

So we would need 2.5 mL of oxygen gas to make an optimum mixture with 5 mL of hydrogen gas

Answer:

The insect exerts no force on the windshield, and the windshield strikes the insect with a large force.

Explanation:

:#D

Answer:

2 Cu2S + 3 O2 = 2 Cu2O + 2 SO2

Explanation:

2 Cu2S + 3 O2 = 2 Cu2O + 2 SO2

Answer:

a. To compare the concentration of 80 g/litre NaOH solution and 3 M NaOH solution, we need to convert one of the concentrations to the other unit.

One mole of NaOH weighs 40 grams. So, to convert 80 g/litre NaOH to Molarity, we can divide 80 g/litre by 40 g/mol to get:

80 g/litre NaOH = 2 M NaOH

Therefore, 3 M NaOH has a higher concentration than 80 g/litre NaOH solution.

b. To compare the concentration of 5.3 g/litre Na2CO3 and N/10 Na2CO3 solution, we need to first understand what N/10 solution means.

N/10 Na2CO3 means that the solution contains 1/10th of the normal concentration of Na2CO3. The normal concentration of Na2CO3 is the molar concentration of Na2CO3 that corresponds to the formula weight of Na2CO3, which is 106 g/mol.

So, the normal concentration of Na2CO3 is 1 mol/L or 1 M Na2CO3.

Therefore, N/10 Na2CO3 solution has a concentration of 1/10 M Na2CO3.

Now, let's compare the two concentrations:

5.3 g/litre Na2CO3 = (5.3/106) M Na2CO3 = 0.05 M Na2CO3

Since 0.05 M Na2CO3 is greater than 1/10 M Na2CO3, the concentration of 5.3 g/litre Na2CO3 solution is higher than that of N/10 Na2CO3 solution.

Explanation:

I believe the answer is D

To handle coin top containers  place hand over label, place stopper on workbench to avoid dropping it, pour using a stirring rod and wipe off any drops.

Handling coin top containers requires care to prevent spills and ensure safe handling. Here are the steps to handle coin top containers properly:

1. Place hand over the label: Before handling the coin top container, ensure that your hand is securely placed over the label or lid. This will help prevent accidental opening or spillage of the container's contents.

2. Place stopper on workbench: If the coin top container has a removable stopper, place it on a stable workbench or surface. By doing so, you can keep the stopper readily accessible and avoid the risk of dropping it or misplacing it.

3. Pour using a stirring rod: If you need to transfer the contents of the coin top container, use a clean stirring rod or suitable utensil for pouring. Slowly and carefully pour the desired amount of liquid from the container, taking care to control the flow and minimize the chances of spills or splashes.

4. Wipe off any drops: After pouring, inspect the outside of the container and the surrounding area for any spills or drops. If you notice any liquid on the container or workbench, use a clean cloth or paper towel to wipe off the drops promptly. This helps maintain cleanliness and prevent accidental contact with the spilled substance.

Remember to follow any specific handling instructions provided by the manufacturer or any safety guidelines relevant to the contents of the coin top container.

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The empirical formula : C₁₁O₁₄O₃

The assumption of the compound consists of C, H, and O

mass of C in CO₂ =

\(\tt \dfrac{12}{44}\times 2.492=0.680~g\)

mass of H in H₂O =

\(\tt \dfrac{2.1}{18}\times 0.6495=0.072~g\)

mass of O :

mass sample-(mass C + mass H)

\(\tt 1-(0.68+0.072)=0.248`g\)

mol of  C :

\(\tt \dfrac{0.68}{12}=0.056\)

mol of H :

\(\tt \dfrac{0.072}{1}=0.072\)

mol of O :

\(\tt \dfrac{0.248}{16}=0.0155\)

divide by 0.0155(the lowest ratio)

C : H : O ⇒

\(\tt \dfrac{0.056}{0.0155}\div \dfrac{0.072}{0.0155}\div \dfrac{0.0155}{0.0155}=3.6\div 4.6\div 1\\\\\dfrac{11}{3}\div \dfrac{14}{3}\div \dfrac{3}{3}=11:14:3\)

Answer:

0.01 faraday

Explanation:

We'll begin by writing the balanced equation. This is illustrated below:

CaCl₂ (aq) —> Ca²⁺ (aq) + 2Cl¯ (aq)

Ca²⁺ (aq) + 2e —> Ca

Molar mass of Ca = 40 g/mol

Mass of Ca from the balanced equation = 1 × 40 = 40 g

1 mole of electron (e) = 1 faraday

2 moles of electrons (e) = 2 × 1 faraday

2 moles of electrons (e) = 2 faraday

From the balanced equation above,

40 g of Ca was deposited by 2 faraday.

Therefore, 0.2 g of Ca will be deposited by = (0.2 × 2)/40 = 0.01 faraday.

Thus, 0.01 faraday is needed for the reaction.

The mileage rate of the car is approximately 52,383.55 meters per deciliter (m/dL) when given the average of 32.5 miles per gallon (mi/gallon).

To convert the mileage rate from miles per gallon (mi/gallon) to meters per deciliter (m/dL) using dimensional analysis, we need to apply conversion factors that relate the given units to the desired units.

Given:

Mileage rate = 32.5 mi/gallon

We can set up the dimensional analysis as follows, using the conversion factors:

32.5 mi/gallon * (1609.34 m/1 mi) * (1 gallon/3.78541 dL)

Let's break down the conversion factors used:

1 mi = 1609.34 m (conversion factor to convert miles to meters)

1 gallon = 3.78541 dL (conversion factor to convert gallons to deciliters)

Now, we can multiply the given mileage rate by the conversion factors:

32.5 mi/gallon * (1609.34 m/1 mi) * (1 gallon/3.78541 dL) = (32.5 * 1609.34) m/dL ≈ 52,383.55 m/dL

Therefore, the mileage rate of the car is approximately 52,383.55 meters per deciliter (m/dL) when given the average of 32.5 miles per gallon (mi/gallon).

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Answer:

Wavelength refers to the length of a wave from one peak to the next. The amplitude or height of a wave is measured from the peak to the trough. The wavelength is measured from peak to peak. Wavelength is directly related to the frequency of a given wave form.

Answer:

Consider how the speaker begins the speech, the support given in the body of the speech, and how the speaker concludes. Listen for changes in tone. Listen for how the speaker uses delivery techniques such as pauses, pace, voice, metaphors and symbolism, repetition and parallelism, and vocabulary.

Explanation:

Answer:

A. Solubility

Explanation:

got it right on edge 2022

There are 0.25 moles of OH⁻ ions in 200.0 mL of a 1.25 M NaOH solution.

The number of moles of OH⁻ in 200.0 mL of a 1.25 M NaOH solution can be calculated as follows: First, we need to convert the volume from milliliters to liters:  200.0 mL = 200.0/1000 L = 0.2 L

Next, we can use the definition of molarity to find the number of moles of NaOH present in the solution: Molarity = moles of solute / liters of solution

Rearranging this equation, we get:

moles of solute = Molarity x liters of solution

So, the number of moles of NaOH in 0.2 L of a 1.25 M solution is:

moles of NaOH = 1.25 mol/L x 0.2 L = 0.25 mol

Since NaOH dissociates in water to give one mole of Na⁺ ions and one mole of OH⁻ ions, the number of moles of OH⁻ ions in the solution is also 0.25 mol.

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Answer:

Explanation:

At constant pressure, the heat of reaction is equal to the enthalpy change of the system. Most chemical reactions occur at constant pressure, so enthalpy is more often used to measure heats of reaction than internal energy

For a chemical reaction, the heat of reaction, also known as enthalpy change (∆H), is equal to the difference between the total energy of the products and the total energy of the reactants.

Enthalpy change represents the amount of heat energy exchanged or released during the course of a reaction. The heat of reaction can be positive (endothermic), indicating that the reaction absorbs heat from the surroundings, or negative (exothermic), indicating that the reaction releases heat to the surroundings.

The magnitude of the heat of reaction is a measure of the amount of heat energy involved in the reaction.

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Answer:

1) Carrying capacity is the maximum number of individuals of a species that an environment can support.

2) Population - all the inhabitants of a particular town, area, or country.

3) An increase in population will inevitably create pressures leading to more deforestation, decreased biodiversity, and spikes in pollution and emissions, which will exacerbate climate change.

4) The three leading causes of population growth are births, deaths, and migration. Births and deaths are seen as natural causes of population change.

The greenhouse gas among the following list of gases is a. Carbon Dioxide. Carbon dioxide (CO2) is a greenhouse gas. It is produced by burning fossil fuels (coal, oil, and natural gas) for energy. I

It is also produced by the decomposition of organic matter and other chemical reactions. Carbon dioxide, methane, and nitrous oxide are the three primary greenhouse gases. Carbon dioxide is the most important greenhouse gas among them. Other greenhouse gases include water vapor, ozone, and some industrial gases.The term "greenhouse gas" refers to any gas that traps heat in the atmosphere. These gases contribute to global warming by allowing sunlight to enter the atmosphere but preventing the heat that is generated from leaving it. As a result, the Earth's temperature rises, resulting in climate change.

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The mole fraction of chlorine gas, if there are 5.0 mol cl2 in the mixture, is 30.72 mol.

Xcl2 = 0.470

nT = 65.3mol

mole fraction of cl2 = mole fraction of cl2(ncl2) / Total moles of gas (nT)

0.470 = ncl2 / 65.3

ncl2 = 30.72 mol

The mole fraction is one of many methods for indicating the concentration of the solution. A concentration unit is a mole fraction. The mole fraction, which is denoted by "X," measures the proportion of solute and solvents in a solution. It is calculated by dividing the number of moles of a given component by the total number of moles in the solution.

The temperature has no impact on the mole fraction.

To determine the mole fraction, it is not essential to know the phase's density.

The ratio of the mixture's partial pressure to its total pressure, in the case of an ideal gas mixture, serves as a proxy for the mole fraction.

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Answer:

C

Explanation:

Parallel makes the shadow happen every month

  non parallel would be less frequent

He should make the Moon orbit Earth at an angle to the table, and not parallel. So, the correct option is C.

The curving path that an object in space takes around another object as a result of gravity is known as an orbit. Moons orbiting planets, planets orbiting planets, and artificial satellites orbiting the Earth are examples of objects where this is frequently seen.

A route that an object in space follows around another is known as an orbit. A satellite is a thing that orbits the earth. An Earth- or moon-like natural satellite is one possibility. Moons are satellites that orbit many planets. A man-made satellite is also possible, such as the International Space Station.

The solar system's planets, comets, asteroids, and other celestial bodies revolve around the sun. The majority of solar system objects travel along or very near a hypothetical flat surface. The ecliptic plane is the name given to this hypothetical plane.

Therefore, the correct option is C.

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Answer:

3MgI2 + Fe2S3 -> 3MgS + 2FeI3

Reaction Type

1.Double Displacement 

2.Oxidation-Reduction

The minimum amount of oxygen required for the complete combustion of 20cm³ of CO and 20cm³ of H₂ would be 20.16 cm³ at STP.

The balanced chemical equation for the combustion of CO and H2 is:

CO + 1/2O2 → CO2

H2 + 1/2O2 → H2O

From the equation, we can see that one mole of CO requires 1/2 mole of O2, while one mole of H2 requires 1/2 mole of O2.

From the balanced equation, we can see that each mole of CO requires 1/2 mole of O2, while each mole of H2 requires 1/2 mole of O2.

Therefore, we need 0.00083/2 = 0.00042 moles of O2 for the combustion of CO and the same amount for the combustion of H2.

The total amount of O2 required is the sum of the amounts needed for each reactant:

Therefore, the minimum amount of oxygen required for the complete combustion of 20 cm³ of CO and 20 cm³ of H2 is approximately 20.16 cm³ at STP.

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The acid HA has a Ka of 1.02 x 10⁻⁷.

In a 1-L volumetric flask, combine 60.05 g of acetic acid with 500 mL of distilled or deionized water to create a 1 M solution. Since acetic acid is a liquid, its volume may also be determined. To get the volume, divide the mass of acid by its density (1.049 g/mL) (57.24 mL).

The dissociation of acid HA has the following Ka expression:

Ka = [A-][H3O+]/[HA]

The concentration of H3O+ can be calculated using the pH of the solution:

pH = -log[H3O+]

[H3O+] = 10(-pH)

Substituting the given values:

[H3O+] = 10(-3.87) = 1.53 x 10⁻⁴ M

Moreover, the acid's starting concentration, HA:

[HA] = 0.23 M

Substituting these values into the Ka expression:

Ka = (1.53 x 10⁻⁴))² / 0.23

Ka = 1.02 x 10⁻⁷)

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zooplankton cod and krill

This is how many grams there are in 525 grams of calcium. One mole of calcium weighs 13.099 grams.

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If the heat capacity of the bomb calorimeter is 9.96 kj/°c, then the amount of heat released from combustion of 2 g of wood is 39.84 kJ.

To determine the amount of heat released from combustion of 2 g of wood, you need to use the formula

Q = C × ΔT Where:Q is the heat released or absorbed in joules (J)C is the heat capacity of the bomb calorimeter (given as 9.96 kJ/°C)ΔT is the change in temperature in degrees Celsius (°C)We can assume that all the heat released from the combustion of the wood is absorbed by the calorimeter, so we can use the heat capacity of the calorimeter to calculate the heat released. Since the calorimeter absorbs the heat, the value of Q will be negative (i.e. the heat is released).

Given: Mass of wood = 2 g Heat capacity of the bomb calorimeter = 9.96 kJ/°C First, we need to calculate the change in temperature. This can be done by measuring the temperature of the calorimeter before and after combustion. Let's assume that the temperature increases by 4.0 °C.ΔT = 4.0 °C Now, we can calculate the heat released: Q = C × ΔTQ = (9.96 kJ/°C) × (4.0 °C)Q = 39.84 kJ

Therefore, the amount of heat released from combustion of 2 g of wood is 39.84 kJ.

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