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Answer:You need to do a lab experiment where hydrogen gas is generated. In order to calculate the yield of gas, you have to know the pressure inside the tube where the gas is collected. But how can you get a barometer in there? Very simple: you don’t. All you need is the atmospheric pressure in the room. As the gas pushed out the water, it is pushing against the atmosphere, so the pressure inside is equal to the pressure outside.

Gas Collection by Water Displacement

Gases that are produced in laboratory experiments are often collected by a technique called water displacement (see Figure below). A bottle is filled with water and placed upside-down in a pan of water. The reaction flask is fitted with rubber tubing which is then fed under the bottle of water. As the gas is produced in the reaction flask, it exits through the rubber tubing and displaces the water in the bottle. When the bottle is full of the gas, it can be sealed with a lid.

A gas produced in a chemical reaction can be collected by water displacement.

[Figure 2]

A gas produced in a chemical reaction can be collected by water displacement.

Because the gas is collected over water, it is not pure but is mixed with vapor from the evaporation of the water. Dalton’s law can be used to calculate the amount of the desired gas by subtracting the contribution of the water vapor.

In order to solve a problem, it is necessary to know the vapor pressure of water at the temperature of the reaction (see Table below). The sample problem illustrates the use of Dalton’s law when a gas is collected over water.

Vapor Pressure of Water (mmHg) at Selected Temperatures (°C)

0 5 10 15 20 25 30 35 40 45 50 55 60 65 70

4.58 6.54 9.21 12.79 17.54 23.76 31.82 42.18 55.32 71.88 92.51 118.04 149.38 187.54 233.7

Sample Problem: Gas Collected by Water Displacement

A certain experiment generates 2.58 L of hydrogen gas, which is collected over water. The temperature is 20°C and the atmospheric pressure is 98.60 kPa. Find the volume that the dry hydrogen would occupy at STP.

Step 1: List the known quantities and plan the problem.

Known

Unknown

The atmospheric pressure is converted from kPa to mmHg in order to match units with the table. The sum of the pressures of the hydrogen and the water vapor is equal to the atmospheric pressure. The pressure of the hydrogen is found by subtraction. Then, the volume of the gas at STP can be calculated by using the combined gas law.

Step 2: Solve.

Now the combined gas law is used, solving for

, the volume of hydrogen at STP.

Step 3: Think about your result.

If the hydrogen gas were to be collected at STP and without the presence of the water vapor, its volume would be 2.28 L. This is less than the actual collected volume because some of that is water vapor. The conversion using STP is useful for stoichiometry purposes.

Summary

The vapor pressure due to water in a sample can be corrected for in order to get the true value for the pressure of the gas.

Review

Why is gas collected over water not pure?

Why would we want to correct for water vapor?

In a lab, 2.20 L of gas is collected over water at a temperature of 30°C and a total pressure of 735.43 mmHg. Find the volume that the dry nitrogen of gas would occupy at STP.

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Use the resource below to answer the questions that follow.

What was the thistle tube used for?

How did the instructor tests for oxygen?

What would have happened to the splint if carbon dioxide had been collected?

Explanation:

The half life for a first-order reaction is 148 minutes. The rate constant of this reaction if the concentration is 1.10M after 50 minutes has elapsed is 0.962M.

The rate constant is the quantity that describes the connection between the molar concentration of the reactants and the rate of the chemical reaction.

For each atom taking part in the reaction, determine its order of reaction. Increase each reactant's initial concentration until it is in the order in which it will react, then multiply all of them together. Subtract the rate from the outcome of the preceding step. The units of your rate constant will be determined by the overall order of the reaction.

The rate constant for the first-order reaction can be calculated by using the equation as follows:

k = 0.693 / t1/2.

In this case, the half life is 148 minutes, so the rate constant is calculated as 0.0047 per minute. This means that, after 50 minutes have elapsed, the concentration of the reaction should be as follows:

1.10M × e^(-0.0047 × 50)

= 0.962M.

Thus, The rate constant of this reaction if the concentration is 1.10M after 50 minutes has elapsed is 0.962M.

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Sulfur oxides emission is more biodegradable than nitrogen oxides.

Both sulfur dioxide (SO2) and nitrogen dioxide (NO2) are components of acid rain and smog, though they are rarely noticeable in South Carolina.

Oil and coal combustion produces sulfur dioxide. It smells terribly bad. Power facilities are the primary sources of SO2.

Burning fossil energy produces nitrogen dioxide (like gasoline). The primary sources of NO2 are cars, trucks, and power facilities

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The average kinetic energy of a mole of Kr at 273.0 K, assuming ideal gas behavior, is 3411.33 J/mol.

To calculate the average kinetic energy of a mole of Kr at 273.0 K, we need to use the following equation:

K.E. = (3/2) * R * T

where K.E. is the kinetic energy per mole, R is the gas constant, T is the temperature in Kelvin, and (3/2) is the average kinetic energy of a molecule in an ideal gas.

The value of R is 8.314 J/mol*K, and the temperature is 273.0 K. Substituting these values into the equation, we get:

K.E. = (3/2) * 8.314 J/mol*K * 273.0 K

K.E. = 3/2 * 2274.22 J/mol

K.E. = 3411.33 J/mol

Therefore, the average kinetic energy of a mole of Kr at 273.0 K, assuming ideal gas behavior, is 3411.33 J/mol.

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Circle b represents the solution after 300 mL of solvent has been added.

Volume percent = {Volume of solute / volume of solution} x 100

After adding the solution, the volume of solution increases but volume of solute remains the same. For same volume of solute, the volume percent is high for once which has the volume of solution is low.

In 100 mL the visually represented solution has 12 balls for solute. When 300 mL of solution is added to the solute, the total volume is 400 mL volume is increased 4 times. Then 12/4 = 3 is the number of solute present in the circle. Circle b represents the solution.

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Answer:

A, B, C

Explanation:

Answer:

c i think

Explanation:

The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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Actually, no. While their mass may be the same (1kg), the volume of lead is a lot smaller than that of feathers. As there is the same mass stuffed in a smaller space, it must be denser. The density of water is 1 g/cm3, so if the density of the lead is more than 1g/cm3, it has to sink

A basic amino acid has an R group that contains ( D) a carboxyl group.

Acid is a substance that has a pH level of lower than 7.0 and is capable of corroding or dissolving other substances. It is usually found in aqueous solutions and is a highly reactive substance. Examples of acid include sulfuric acid, hydrochloric acid, nitric acid and acetic acid. These are used in a variety of industries such as food production, industrial cleaning and chemical engineering. Acid is also used in the laboratory for titrations, pH testing and other experiments. Acids can be dangerous if mishandled and can cause skin, eye and respiratory irritation and even chemical burns.

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Answer:

b

Explanation:

Answer:

Explanation:

Unit 10 - Acid/Base ... (a) Mg(OH. 2. ) (b) Mg(OH). 2. (c) Mg. 2. OH. (d) MgOH. 2. Standard: ... balanced equation for these neutralization reactions: 3. HCl + NaOH → ... H2CO3 + Ca(OH)2 → ... C5.7B Predict products of an acid-base neutralization. 8. 2 NH4OH + H2S ...An Arrhenius base is a compound that increases the OH − ion concentration in ... and a base is called a neutralization reaction and can be represented as follows: ... chemical equation for the neutralization reaction between HCl and Mg(OH) 2. ... acid, an Arrhenius base, or neither. a) NaOH. b) C 2H 5OH. c) H 3PO 4. 6

Answer:

B

IS THE CORRECT ANSWER

The characteristic of a strong base is that it removes H⁺ ions from solution.

Strong bases are those substance which have a pH range in between the value of 7.1 to 14.

So, strong bases removes H⁺ ion from the solution.

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Answer:

It removes H+ ions from solution.

Explanation:

i got it right

1. The pH is 2.44

2. The pOH is 3.36

3. The pH is 13.24

4. The pOH is 11.64

5. The pH is 11.99

pH = –Log H⁺

pH = –Log 3.6×10¯³

pH = 2.44

pOH = –Log OH¯

pOH = –Log 4.4×10¯⁴

pOH = 3.36

pH = –Log H⁺

pH = –Log 5.7×10¯¹⁴

pH = 13.24

pOH = –Log OH¯

pOH = –Log 2.3×10¯¹²

pOH = 11.64

We'll begin by obtaining the pOH of the solution. This illustrated below:

pOH = –Log OH¯

pOH = –Log 9.7×10¯³

pOH = 2.01

Finally, we shall determine the pH as follow:

pH + pOH = 14

pH + 2.01 = 14

Collect like terms

pH = 14 - 2.01

pH = 11.99

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Answer:

True acid deposition is just a bigger term used to describe acid rain.

The new volume of the products is 45.0 L.

The ideal gas law can be used to relate the initial and final volumes of the gas sample, assuming that the temperature and pressure are held constant:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

At the start of the reaction, the sample contains 2 moles of gas A and no moles of gas B. Therefore, the initial number of moles in the system is:

n_initial = n_A = 2

The initial volume of the sample is given as 30.0 L.

At the end of the reaction, 2 moles of gas A have been converted to 3 moles of gas B. Therefore, the final number of moles in the system is:

n_final = n_A + n_B = 0 + 3 = 3

We can now use the ideal gas law to find the final volume of the system:

P_initial V_initial = n_initial RT

P_final V_final = n_final RT

Dividing the second equation by the first equation, and noting that the temperature and pressure are held constant, we obtain:

V_final / V_initial = n_final / n_initial

Substituting in the values for n_final and n_initial, we get:

V_final / 30.0 L = 3 / 2

Solving for V_final, we get:

V_final = (3 / 2) x 30.0 L = 45.0 L

The final volume of the system can be found using the ideal gas law and the fact that the temperature and pressure are held constant. The initial and final number of moles of gas in the system are used to relate the initial and final volumes of the gas sample.

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Answer:

hi hehe I'm new here hehehe

The following chemical weathering process that is responsible for the breakdown of most silicate minerals is E. hydrolysis.

Hydrolysis is a chemical reaction between water and minerals that form new compounds. In this process, water breaks down the minerals, and the hydrogen ions (H⁺) and hydroxide ions (OH⁻) from the water combine with the mineral ions, forming new minerals.

Hydrolysis is an important process in the breakdown of silicate minerals, which are the most abundant minerals in the Earth's crust. The process is responsible for the formation of clay minerals, which are important components of soils and sediments. In summary, hydrolysis is the most significant chemical weathering process that breaks down most silicate minerals. So the correct answer is E. hydrolysis  is responsible for the breakdown of most silicate minerals.

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the answer is the third one

Explanation:

it just is I think

Answer:

ITS CALLED RASH

Explanation:

Answer:

Bicarbonate is naturally produced by the reaction of carbon dioxide (CO2) with water. (H2O) to produce carbonic acid (H2CO3), which dissociates to a bicarbonate ion and a. proton (H. + ).

Answer:

The awnser is cloudy suspension.

As the  microscopic droplets of one liquid  are suspended in the other, it is a heterogeneous mixtures.

Heterogenous mixtures is defined as a type of mixture where in the composition is not uniform throughout the mixture.It consists as two or more phases. The phases are chemically distinct from each other.

As there are two or more phases present in heterogenous mixtures they can be separated by solvent extraction where in one phase is miscible with the solvent and the other phase is immiscible.

Components of a heterogenous mixtures are distinctly visible . There are two types of heterogenous mixtures, the colloids and the suspensions.These two vary with each other with respect to particle size.These are the mixture which are easy to separate out.

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Answer:

2FeO + C ---> 2Fe +CO2

Explanation:

Answer:

10.58km

The formula needed to calculate the amount of wire used is expressed as:

W is the weight of wire used to wind a magnet

wg is the weight of wire per km

Given the following parameters:

Substitute the given parameters into the formula to have:

Hence the length of wire used is 10.58km

Copper acetate is the oxidizing agent in the oxidation of benzoin. The oxidation state of copper is +2 at the beginning and +1 at the end of the reaction.

In the oxidation of benzoin with copper acetate, copper acetate acts as the oxidizing agent and benzoin as the reducing agent. During the reaction, benzoin loses electrons and undergoes oxidation while copper acetate gains electrons and undergoes reduction. At the beginning of the reaction, copper is in its +2 oxidation state, which is reduced to +1 oxidation state by the end of the reaction.

This reduction is caused by the transfer of electrons from benzoin to copper acetate, which results in the formation of copper (I) acetate as a byproduct. Overall, the reaction is a redox reaction, with the oxidation state of benzoin changing from 0 to +2, and the oxidation state of copper changing from +2 to +1.

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Answer:

Malachite

Explanation:

Malachite is the only listed compound that must contain copper and oxygen.

Copper and oxygen are both elements found on the periodic table. They have the following symbols;

         Copper  = Cu

         Oxygen  = O

From the given choices, only option 1 has the symbol Cu and O.

So only malachite contains both copper and oxygen.