The half life of oxygen is 2 minutes. What fraction of a sample of 0.15 will remain after 5 half lives?​

Answer:

d) must remain at 7

Explanation:

The pH of the aqueous solution should be kept at 7 as it is considered to be a neutral pH chemical.

If the pH exceeds the value 7, it is considered alkaline, and without the pH decreases from the value 7, it is considered acidic.

That is why if this value varies, the qualities of the neutral pH will not be maintained.

Explanation:

Fe(NO3)3 + 3NaOH → Fe(OH)3 + 3NaNO3

First, let's transform 106 g of Fe(OH)3 into moles using its molar mass (106.87 g/mol) and the following formula:

n = m/MM

n = 106/106.87

n = 1 mol

The equation tells us that

3 moles of NaOH produce 1 mol of Fe(OH)3.

Answer: 3 mol

Answer:

The calculated concentration of acid will be higher than the actual concentration of acid

Explanation:

We have information that all enable us to calculate the concentration of KOH in the solution. From the question, we have;

Mass of KOH= 14.555g

Molar mass of KOH= 56.1056 g/mol

Volume of solution= 500 ml

Number of moles of KOH= ???

From;

m/M= CV

m= mass of KOH

M= molar mass of KOH

C= concentration of KOH solution

V= volume of solution

Substituting values;

14.555g/56.1056 g/mol = C× 500/1000

0.259 moles = 0.5C

C= 0.259/0.5

C= 0.518 M

If the acid is HA, the reaction equation is;

KOH(aq) + HA(aq) ----> KA(aq) + H2O(l)

The concentration of the acid is usually determined via titration. This involves delivering a particular volume of acid in a burette into the base and watching out for the volume of acid used at end point. If there are air bubbles in the burette, then more volume of acid is recorded than that actually used and this will make the calculated concentration of the acid to be higher than the actual concentration of acid present.

At equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

1: Write the balanced chemical equation:

\(C_O\)(g) + \(Cl_2\)(g) ⟶ \(C_OCl_2\)(g)

2: Set up an ICE table to track the changes in moles of the substances involved in the reaction.

Initial:

\(C_O\)(g) = 0.3500 mol

\(Cl_2\)(g) = 0.05500 mol

\(C_OCl_2\)(g) = 0 mol

Change:

\(C_O\)(g) = -x

\(Cl_2\)(g) = -x

\(C_OCl_2\)(g) = +x

Equilibrium:

\(C_O\)(g) = 0.3500 - x mol

\(Cl_2\)(g) = 0.05500 - x mol

\(C_OCl_2\)(g) = x mol

3: Write the expression for the equilibrium constant (Kc) using the concentrations of the species involved:

Kc = [\(C_OCl_2\)(g)] / [\(C_O\)(g)] * [\(Cl_2\)(g)]

4: Substitute the given equilibrium constant (Kc) value into the expression:

1.2 x \(10^3\) = x / (0.3500 - x) * (0.05500 - x)

5: Solve the equation for x. Rearrange the equation to obtain a quadratic equation:

1.2 x \(10^3\) * (0.3500 - x) * (0.05500 - x) = x

6: Simplify and solve the quadratic equation. This can be done by multiplying out the terms, rearranging the equation to standard quadratic form, and then using the quadratic formula.

7: After solving the quadratic equation, you will find two possible values for x. However, since the number of moles cannot be negative, we discard the negative solution.

8: The positive value of x represents the number of moles of \(Cl_2\)(g) at equilibrium. Substitute the value of x into the expression for \(Cl_2\)(g):

\(Cl_2\)(g) = 0.05500 - x

9: Calculate the value of \(Cl_2\)(g) at equilibrium:

\(Cl_2\)(g) = 0.05500 - x

\(Cl_2\)(g) = 0.05500 - (positive value of x)

10: Calculate the final value of \(Cl_2\) (g) at equilibrium to get the answer.

Therefore, at equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

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The blood pH would turn more alkaline

There is more bicarbonate ions in the blood

The equilibrium would have to shift to the left

Hyperventilation is a condition in which a person breathes rapidly and deeply, leading to a decrease in the concentration of carbon dioxide (CO2) in the blood. This causes a shift in the balance of the carbonic acid-bicarbonate buffer system in the blood, which can affect the pH of the blood.

The carbonic acid-bicarbonate buffer system is an important mechanism that helps regulate the pH of the blood. It involves the equilibrium between carbonic acid (H2CO3) and bicarbonate ions (HCO3-) in the blood:

H2CO3 ⇌ H+ + HCO3-

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Answer:

A. The reaction shifts to the right (products) and the concentrations of I and H₂ decrease.

Explanation:

If gas is removed from the system at equilibrium, the system will try to compensate for the loss by shifting the reaction in a direction that produces more gas molecules. This is known as Le Chatelier's principle, which states that a system at equilibrium will respond to a disturbance by shifting in a way that minimizes the effect of the disturbance.

In this case, since gas is being removed from the system, the reaction will shift to the side that produces more gas molecules. Looking at the balanced equation, we can see that 2HI(g) has a greater number of gas molecules compared to H₂(g) and I₂(g). Therefore, the system will shift to the right (products) to produce more HI(g) and reestablish equilibrium.

As per the given data, 1.6 grams of oxygen reacted in this experiment.

To calculate the amount of oxygen that reacted in the experiment, we need to determine the difference in the mass of X oxide (X,O) formed and the mass of X initially used.

Given:

Mass of X = 4.6 g

Mass of X oxide (X,O) = 6.2 g

To find the amount of oxygen that reacted:

Mass of oxygen = Mass of X oxide - Mass of X

= 6.2 g - 4.6 g

= 1.6 g

Therefore, 1.6 grams of oxygen reacted in this experiment.

Calculate the mass of 1 mole of X:

Given that the mass of X is 4.6 g, we can calculate the molar mass of X by dividing the mass by the number of moles:

Molar mass of X = Mass of X / Number of moles of X

Molar mass of X = 4.6 g / 0.1 mol

Molar mass of X = 46 g/mol

Therefore, the mass of 1 mole of X is 46 grams.

Thus, the answer is 46 grams.

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The application of force in the direction of the motion of an object. The second scenario involves applying force to a moving item that is traveling in the opposite direction.

A force is an influence that has the power to alter an object's motion. An object with mass can change its velocity, or accelerate, as a result of a force. A force has both a direction and a magnitude.

Force is used to describe a body's tendency to modify or change its state as a result of an external cause. When force is applied, the body can also alter its size, shape, and direction.

A push or pull that an object experiences as a result of interacting with another item is known as a force. Every time two items interact, a force is exerted on each of the objects. The force is no longer felt by the two objects when the interaction ends.

Thus, Force applied to an item in motion that originates in any direction constitutes the third situation where force is created.

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The gas law that is calculated with the pressure and volume variables at a constant temperature is Boyle's Law. Boyle's Law states that the pressure (P) of a gas is inversely proportional to its volume (V) when temperature (T) is held constant.

Mathematically, it is expressed as P₁V₁ = P₂V₂, where P₁ and V₁ represent the initial pressure and volume, and P₂ and V₂ represent the final pressure and volume.According to Boyle's Law, if the volume of a gas is reduced while keeping the temperature constant, the pressure will increase proportionally.

Similarly, if the volume is increased, the pressure will decrease. This relationship holds as long as the temperature remains constant throughout the process. Boyle's Law is one of the fundamental gas laws and provides insights into the behavior of gases under changing pressure and volume conditions at a constant temperature.

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Answer:

                                                                2CO(g) + O2(g) ⇌ 2CO2(g)

Increasing the concentration of CO -         ↓         ↓                 ↑

Increasing the concentration of CO2 -       ↑         ↑                 ↓

Explanation:

The given reaction is

2CO(g) + O2(g) ⇌ 2CO2(g)

a) When the concentration of CO is increased, the stress is relieved as the reaction that consumes the added CO occurs more rapidly than its reverse reaction, for example., the forward reaction rate increases. The equilibrium will shift in favor of the product. However, the concentration of reactants (CO and O2) decreases and product concentration (CO2) increases.

b) When the concentration of CO2 is increased, the stress is relieved as the reaction that consumes the added CO2 occurs more rapidly than its reverse reaction, for example., the rate of backward reaction increases. The equilibrium will shift in favor of the reactant. Therefore, the concentration of reactants (CO and O2) increases, and the product concentration (CO2) decreases.

Hope this helps!

Answer:

Method 1 isn't safe for humans.

Answer: Method 2 is not environment friendly, or D.

Explanation: Recycled water, or graywater, is very harmful to the fish and if used to contain them within the farm, it would make the fish overall very sick, and the fish would be refused from being sold into stores. Thus, this is the correct answer.

Explanation:

pdrias darme la traduccion no te entiendo

The volume of solution needed if I need to make 2.5 L of a 0.2 M fruit drink solution from the 0.7 M drink solution is 0.714L.

The concentration of a solution can be calculated using the following formula;

McVc = MdVd

According to this question, one needed to make 2.5 L of a 0.2 M fruit drink solution from the 0.7 M drink solution. The final volume needed is as follows:

2.5 × 0.2 = 0.7 × V

0.5 = 0.7V

V = 0.714L

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Answer:

b

Explanation:

Answer:

will be 9.7 Liters

Explanation:

I've attached a picture down below for you, if this will help. If you need further explanation, please ask me :)

Complete question is;

In an experiment to determine the density of a liquid, an error of no more than 5.0% permitted. The true value for this density is 1.4392 g/cm²

What are the maximum and minimum values which a student may obtain to fall within the acceptable range.

Answer:

Maximum = 1.5112

Minimum = 1.3672

Explanation:

We are told the true value for the density is 1.4392 g/cm².

We are also told that the error should be no more than 5%(0.05).

This means the acceptable range of values would be;

1.4392 ± 0.05(1.4392)

This gives;

1.4392 + 0.05(1.4392) = 1.5112

Or

1.4392 - 0.05(1.4392) = 1.3672

Thus,

Maximum = 1.5112

Minimum = 1.3672

The molecular formula of fructose is C₆H₁₂O₆.

The molecular formula is derived in the following steps:

Step 1. the molality of the solution is determined first

Molality = Change in boiling point/Kb

Molality = (78.59 - 78.35)/1.2 = 0.2 molal

Step 2. Moles of solute is determined.

Moles of solute = molality * mass of solvent (kg)

moles = 0.2 * 0.325 = 0.065

Step 3. Molar mass of fructose = mass/moles

Molar mass of fructose = 11.7/0.065 = 180 g/mol

Step 4: Mole ratio of constituent elements

Carbon = 40% * 180/12 = 6

Hydrogen = 6.7% * 180/1 = 12

Oxygen = 53.3% * 180/16 = 6

Therefore, the molecular formula of fructose is C₆H₁₂O₆.

In conclusion, the molecular formula of fructose is derived from the molality of the solution.

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Hello, this is Bing. I can help you with your question. Based on the information I found on the web, **H2** can be broken down into its two atoms of hydrogen (H) by supplying enough energy to overcome the bond that holds them together⁴. This process is called **dissociation** and requires an energy equal to or greater than the **dissociation energy** of H2, which is about 436 kJ/mol⁴.

One way to break down H2 is by using **electricity** to split water (H2O) into hydrogen (H2) and oxygen (O2) through a process called **electrolysis**¹. In this process, water is decomposed into its elements by passing an electric current through it. The electric current is provided by a battery or another source of electricity and the water needs to have an **electrolyte**, such as salt or acid, added to it to make it conductive¹. Two electrodes, usually made of metal or other conductive material, are inserted into the water and connected to the battery. The electrode connected to the positive terminal of the battery is called the **anode** and the one connected to the negative terminal is called the **cathode**¹. When the electric current flows through the water, hydrogen gas bubbles form at the cathode and oxygen gas bubbles form at the anode¹. The overall chemical reaction for electrolysis of water is:

2 H2O → 2 H2 + O2

Another way to break down H2 is by using **heat** to cause a reaction between hydrogen and oxygen that produces water and releases a large amount of energy. This reaction is called **combustion** or **oxidation** and can be ignited by a spark or a flame³. The reaction is very fast and explosive and can be dangerous if not controlled. The overall chemical reaction for combustion of hydrogen is:

2 H2 + O2 → 2 H2O

I hope this helps you understand how H2 can be broken down and what methods are used to do so.

Fossil fuels are essential part of the power generation in the world. They are easily combustible and more reliable and cheaper. However, the burning of fossil fuels releases toxic gases  to the environment.

Fossil fuels are fuel generated from the decomposition materials. Petroleum, coal, natural gas  etc. are fossil fuels which are excavating from the earth.

Fossil fuels are non-renewable sources of energy. Hence, as the existing fossil sources are exhausted no more fossil fuel can be made. It is cheaper, reliable and easy to use.

However, the toxic hydrocarbon gases released from the burning of fossil fuels make the environment polluted. Therefore, overuse of fossil fuel definitely rise the atmospheric pollution.

Its use over the next 50 years, will increase the global warming and more of it will be exhausted.

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1. The forces on the same cart at rest are the gravitational force (weight), which acts downward, and the normal force, which acts upward to support the weight of the cart and any objects inside it.

2. The net force on the cart would be 20.0 newtons (40.0 N pushing force - 20.0 N friction force = 20.0 N net force). The cart may not move at a constant velocity over the spilled margarine due to the decrease in friction force.

3. The normal force on the shopping cart after 75 newtons of groceries are added would increase to support the additional weight of the groceries.

4. The force that accelerates the cart down the ramp is the component of the gravitational force that acts parallel to the ramp, which is known as the force of gravity or weight.

5. The friction force on the cart when it is rolling along the blacktop parking lot would likely be greater than the friction force on the cart when it is inside the grocery store, as blacktop is generally rougher and less smooth than smooth vinyl tile.

6. It is easier to get one empty cart moving because it has less mass and inertia than a line of 20 empty carts. Inertia is the tendency of an object to resist changes in its motion, and it increases with mass. Therefore, it requires more force to overcome the inertia of a line of 20 carts than that of a single cart.

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Gravitational force and normal force acts on the same cart at rest and it is worth noting that the gravitational force on an object at rest on a flat surface is equal to the normal force on that object.

What about the net force and the normal force relative to the cart?

The cart's net force would be 20.0 N (40.0 N - 20.0 N = 20.0 N net force). Because of the decrease in friction force, the cart may not move at a constant velocity over the spilled margarine. Also, it is to be noted that the normal force on the cart would increase after 75 N of groceries were added to support the additional weight of the groceries.

What about the frictional force on the cart?

Because blacktop is generally rougher and less smooth than smooth vinyl tile, the friction force on the cart while rolling along the blacktop parking lot is likely to be greater than the friction force on the cart while rolling inside the grocery store. It is easier to move one empty cart than a line of 20 empty carts because it has less mass and inertia. Inertia is an object's tendency to resist changes in motion, and it increases with mass.

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Answer:

C.) protons and neutrons

Explanation:

Most atoms contain proton(s), neutron(s), and electron(s). Within the nucleus of an atom, there are protons and neutrons. Electrons are located outside of the nucleus.

Answer:

The pH of the solution is 1.34, being an acidic pH.

Explanation:

pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.   The acronym pH stands for hydrogen potential.

The pH scale ranges from 0 to 14. Values ​​less than 7 indicate the acidity range and those greater than 7 indicate alkalinity or basicity. Value 7 is considered neutral. Mathematically, pH is the negative logarithm of the molar concentration of hydrogen or proton ions (H⁺) or hydronium ions (H₃O⁺).

pH= - log [H⁺] = - log [H₃O⁺]

In this case, [H⁺]= 4.6*10⁻² M. Replacing:

pH= - log 4.6*10⁻²

Solving:

pH= 1.34

The pH of the solution is 1.34, being an acidic pH.

Answer: reflection

Explanation:

A mirror forms an image because of reflection of light. Therefore, the correct option is option B among all the given options.

Light is the electromagnetic radiation that is visible with the eye. Electromagnetic radiation has a very broad wavelength range, ranging from gamma rays having wavelengths shorter than around 1 1011 metre to radio waves with wavelengths measured in metres.

The spectral areas next to the visible band, infrared at one end as well as ultraviolet at the other, are often commonly referred to as light. The velocity of light in the vacuum is indeed a basic physical constant, with the current accepted value being 299,792,458 meters per second, or approximately 186,282 miles a second. A mirror forms an image because of reflection of light.

Therefore, the correct option is option B.

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According to the given reaction, 1 mole of Mg3N2 reacts with 3 moles of H2O.

This, converted to mass, is 101g of Mg3N2 react with 54g of H2O.

From this we can conclude that the limit reagent is Mg3N2.

We have to base our calculation on the mass of Mg3N2 given.

During the reaction, 3 moles of MgO are produced from 101g of Mg3N2. This, converted to mass, is 120.9g of MgO.

a. Use this ratio to find how many grams of MgO are produced from 3.82 grams of Mg3N2:

b. To find the percent yield, divide the mass of MgO formed by the theoretical mass of MgO and multiply times 100:

The percent yield is 78.8%.

Answer:

\(\boxed {\boxed {\sf 8.10 \ L}}\)

Explanation:

This question asks us find the volume of a gas sample given a change in temperature. Since the pressure remains constant, we only are concerned with the variables of temperature and volume.

We will use Charles's Law. This states the volume of a gas is directly proportional to the temperature of a gas. The formula is:

\(\frac{V_1}{T_1}=\frac{V_2}{T_2}\)

The gas starts at a volume of 2.70 liters and a temperature of 25.0 degrees Celsius.

\(\frac {2.70 \ L}{25.0 \textdegree C}=\frac{V_2}{T_2}\)

The temperature is increased to 75.0 degrees Celsius, but the volume is unknown.

\(\frac {2.70 \ L}{25.0 \textdegree C}=\frac{V_2}{75.0 \textdegree C}\)

We are solving for the volume at 75 degrees Celsius, so we must isolate the variable V₂.

It is being divided by 75.0 °C. The inverse operation of division is multiplication, so we multiply both sides of the equation by 75.0 °C.

\(75.0 \textdegree C *\frac {2.70 \ L}{25.0 \textdegree C}=\frac{V_2}{75.0 \textdegree C} * 75.0 \textdegree C\)

\(75.0 \textdegree C *\frac {2.70 \ L}{25.0 \textdegree C}= V_2\)

The units of degrees Celsius (° C) cancel.

\(75.0 *\frac {2.70 \ L}{25.0}= V_2\)

\(75.0 *0.108 \ L = V_2\)

\(8.1 \ L = V_2\)

The original measurements have 3 significant figures, so our answer must have the same. Currently, the answer has 2. If we add another 0, the value of the answer does not change, but the number of sig figs does.

\(8.10 \ L = V_2\)

The volume of this gas sample at 75.0 degrees Celsius is 8.10 Liters.

Answer:

D . They are found in moist environments.

Explanation:

Nonvascular plants do not have a xylem or phloem, roots, stems, or leaves. Because these plants lack water-conducting tissues, they fail to achieve the structural complexity and size of most vascular plants and have evolved in habitats which allow their survival and reproduction.

The plant body that is most obvious in non-vascular plants are the the gametophyte generation. The gametophte gemeration is haploid.

The non-vascular plants grow in moist environments. It is due to lack of vascular tissue that requires to maintain close contact with water to prevent desiccation. Nonvascular plants are plants that do not have any special internal pipelines or channels to carry water and nutrients. Instead, nonvascular plants absorb water and minerals directly through their leaflike scales. Nonvascular plants are usually found growing close to the ground in damp, moist places. Non-vascular plants thrive in damp conditions since they don't need to rely on roots to acquire enough water.