what is the mass-volume percentage of 30 g of sodium nitrate in 150 ml of solution? your answer should have one significant figure. provide your answer below:

Answer:

A typical range of ATOMIC radii would be 0.050 − 0.200 nm or so.

To perform the procedure, slowly add the calculated amount of 0.2 F AgNO3 from a buret while maintaining constant stirring. Additionally, incorporate a 10% excess of AgNO3 as directed by the instructor.

In this procedure, the objective is to add a specific amount of 0.2 F AgNO3 solution with constant stirring. The use of a buret allows for precise control over the volume being added. By adding the solution slowly, the reaction can be monitored and controlled more effectively.

Furthermore, it is mentioned that a 10% excess of AgNO3 should be added. This means that an additional 10% of the calculated amount of AgNO3 should be incorporated. The purpose of this excess is to ensure that all the reactants are fully consumed, promoting a complete reaction and maximizing the desired outcome.

The instructor will provide the 0.2 M AgNO3 solution, which is a solution with a known concentration. This concentration allows for accurate calculations of the required volume to achieve the desired amount of AgNO3.

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Answer:

1.53 cm/s

Explanation:

Rate = Length/time

        = 23/15

        = 1.53 cm/s

BRAINLIEST?

PRETTY SURE IT IS.

The total time required for the decay is approximately 1416.0 hours, which is closest to the given option C. 1006.9 hours.

Option (C) is correct.

To calculate the number of half-lives required for the decay. The half-life of 140 Ba is given as 283.2 hours.

First, we calculate the fraction of the original amount remaining after each half-life. Since the half-life represents the time it takes for half of the substance to decay, the fraction remaining after each half-life is 1/2.

To find the number of half-lives required to decay from 35 mg to 1.0 mg, we can set up the following equation:

(35 mg) * (1/2)ⁿ = 1.0 mg

Where 'n' is the number of half-lives.

Now, let's solve for 'n':

(1/2)ⁿ = 1.0 mg / 35 mg

(1/2)ⁿ = 0.02857

To find 'n', we can take the logarithm (base 1/2) of both sides:

n = log base 1/2 (0.02857)

Using the logarithmic property, we know that log base a (b) = log base c (b) / log base c (a):

n = log (0.02857) / log (1/2)

Using a calculator, we can find:

n ≈ 4.243

Since 'n' represents the number of half-lives, and we usually round up to the nearest whole number for half-life calculations, we get:

n ≈ 5

Therefore, it would take approximately 5 half-lives for the 35 mg sample of 140 Ba to decay to 1.0 mg.

To calculate the total time required, we multiply the half-life by the number of half-lives:

Total time = 283.2 hours * 5

Total time ≈ 1416 hours

Rounding to one decimal place, the total time required for the decay is approximately 1416.0 hours, which is closest to the given option C. 1006.9 hours.

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The ways to  make a skit are:

In skit making, one can start by coming up with humorous concepts for your skit. Write out your scenario, practice it, and then perform it in front of an audience or record it. Then Continue to create fresh drafts.

Note that one can ask someone you trust's opinion should see your sketch. Then make a note of what people found amusing and not amusing.

Therefore, skit  is seen as short comedy show that can be performed by second graders.

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Bromine exists naturally as a mixture of bromine-79 and bromine-81 isotopes. An atom of bromine-81 contains: 81 protons, 81 electrons, and 81 neutrons.

Bromine is a chemical element with the symbol Br and atomic number 35.

It is the third-lightest halogen and is a fuming red-brown liquid at room temperature that evaporates readily to form a similarly coloured gas.

It occasionally exists as a diatomic molecule, Br2.

It has 35 electrons and 35 protons, which is 79Br.

When it comes to bromine-81, it has 81 protons and 81 electrons, which means that it is chemically indistinguishable from regular bromine.

However, it contains 81 neutrons in its nucleus, unlike the most common form of bromine, which contains only 46 neutrons in its nucleus.

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Answer:

A calorie is the amount of energy needed to raise the temperature of 1 gram of water 1 degree Celsius. The complete combustion of a large kitchen match, for example, gives you about one kilocalorie of heat

When a burning matchstick is held near the gas jar, it burns brightly.

Combustion is the reaction of a substance with oxygen causing release of energy.  The reaction is exothermic and often involves a flame.

Combustion of natural gas is an important source of energy for homes and industry.

When a burning matchstick is held near the gas jar, it burns brightly because oxygen supports combustion. When oxygen combines, chemically with another chemical like carbon or hydrogen, energy is released rapidly in the form of heat that creates fire and makes the matchstick burns brightly.

Therefore, when a burning matchstick is held near the gas jar, it burns brightly.

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The activation energy of the reaction is approximately 71.46 kJ/mol, rounded to 2 decimal places.

To find the activation energy (Ea) of the reaction, we can use the Arrhenius equation, which relates the rate constant (k) to the temperature (T) and activation energy. The Arrhenius equation is given by:

k = A * e^(-Ea/RT)

Where:

k is the rate constant

A is the pre-exponential factor (frequency factor)

Ea is the activation energy

R is the gas constant (8.314 J/(mol·K))

T is the temperature in Kelvin

We have two sets of data:

At 600 K, k1 = 3.4 m^(-1)s^(-1)

At 750 K, k2 = 31.0 m^(-1)s^(-1)

Taking the natural logarithm (ln) of both sides of the Arrhenius equation, we can rearrange the equation to solve for the activation energy:

ln(k) = ln(A) - (Ea/RT)

We can create two equations using the given data:

ln(k1) = ln(A) - (Ea/(R * 600))

ln(k2) = ln(A) - (Ea/(R * 750))

Subtracting the second equation from the first eliminates the ln(A) term:

ln(k1) - ln(k2) = (Ea/R) * ((1/600) - (1/750))

Simplifying further:

ln(k1/k2) = (Ea/R) * ((750 - 600) / (600 * 750))

Now we can solve for Ea:

Ea = (R * (ln(k1/k2))) / ((750 - 600) / (600 * 750))

Using the given values and the appropriate units:

Ea = (8.314 J/(mol·K) * ln(3.4/31.0)) / ((750 - 600) / (600 * 750))

Converting the units from J to kJ:

Ea = (8.314 × 10^(-3) kJ/(mol·K) * ln(3.4/31.0)) / ((750 - 600) / (600 * 750))

Ea ≈ 71.46 kJ/mol

Therefore, the activation energy of the reaction is approximately 71.46 kJ/mol, rounded to 2 decimal places.

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Answer:

soysauce bro

Explanation:

Answer:

trail mix

Explanation:

a heterogeneous mixture is a mixture with non-uniform composition. two or more of the mixture's components must be separate for the mixture to be heterogeneous.

HClO₄ + H₂SO₄ ⇆ ClO₄⁻ + H₃SO₄⁺

The conjugate acid & base pairs are = HClO₄/ClO₄⁻ and H₃SO₄⁺/H₂SO₄

A conjugate acid is a chemical molecule that is created when an acid transfers a proton (H+) to a base, according to the Bronsted-Lowry acid-base theory. In other words, a hydrogen ion has been added to the base, as opposed to the reverse reaction when a hydrogen ion is lost from the base.

On the other hand, when an acid provides a proton to a chemical reaction, a conjugate base is what is left over. As a result, a conjugate base is a species that is created by removing a proton out of an acid since it can gain a hydrogen ion in the inverse reaction.

The conjugate base of an acid may also be acidic since some acids have the capacity to release a high amount of protons.

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Answer:

nitrogen oxides and hydrogen

Answer:

Nucleas is a cell organelle

The option that is a type of cell organelle would be D.Nucleus

A nucleus is a membrane-bound organelle that contains the cell's DNA. It is the control center of the cell, and it is responsible for storing genetic information and directing the cell's activities.

The other options are not cell organelles. Membrane is a  phospholipid bilayer that surrounds the cell and separates the cell's interior from the environment. Cytoplasm is the jelly-like substance that fills the cell and contains the cell's organelles. DNA is the genetic material of the cell, but it is not an organelle.

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The best substance for melting ice on a driveway is table salt (NaCl).

Because it contains less than 40% of sulphates (compared to 60% in sodium chlorides), magnesium chloride is a safer option for melting ice. This type of ice melter is mild on the majority of household surfaces and has a low toxicity level, making it safer for the environment.

It will kill your concrete. Why take a chance. Magnesium chloride, sometimes known as MAG, can be fatal when used as an ice melter to remove ice off concrete driveways, sidewalks, and highways.

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Answer:

a salt and water is the answer.

Gases generated in a chemical reactions are sometimes collected by displacement of water, hydrogen gas can be quantitatively collected by this method.

One of the four basic states of matter is gas. The other three are plasma, liquid, and solid. Individual atoms may make up a pure gas (such as a noble gas such neon), elementary molecules comprised of a single kind of atom (such as oxygen), or complex molecules made of a number of different elements.

A variety different pure gases can be found in a gas mixture like air. Gases generated in a chemical reactions are sometimes collected by displacement of water, hydrogen gas can be quantitatively collected by this method.

Therefore, hydrogen gas can be quantitatively collected by this method.

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Answer:

1. 250 J

2. 500000 J

3. 146250 J

4. 400 J

Explanation:

1. Determination of the energy of the ball.

Mass (m) = 5 Kg

Velocity (v) = 10 m/s

Energy (E) =?

E = ½mv²

E = ½ × 5 × 10²

E = 2.5 × 100

E = 250 J

2. Determination of the energy of the rock.

Mass (m) = 250 Kg

Height (h) = 200 m

Acceleration due to gravity (g) = 10 m/s²

Energy (E) =?

E = mgh

E = 250 × 10 × 200

E = 500000 J

3. Determination of the energy of the car.

Mass (m) = 1300 Kg

Velocity (v) = 15 m/s

Energy (E) =?

E = ½mv²

E = ½ × 1300 × 15²

E = 650 × 225

E = 146250 J

4. Determination of the energy of the bullet.

Mass (m) = 0.005 Kg

Velocity (v) = 400 m/s

Energy (E) =?

E = ½mv²

E = ½ × 0.005 × 400²

E = 0.0025 × 160000

E = 400 J

Answer:

Sorry for the late answer but

Number 1 is 250 J

Number 2 is 500000 J

Number 3 is 146250 J

Number 4 is 400 J

Explanation:

Answer:

1) It gets slower the farther out they are.

2) The farther out you are from the sun the less gravitational pull you have, which makes it go slower as it orbits.

3) Gravity ;) :)

Explanation:

Hope this helps! Plz mark as brainliest! :)

1.) The four inner planets have slower orbits and the four outer planets have faster orbits.

2.) The closer a planet is to the Sun, the stronger the Sun's gravitational pull on it, and the faster the planet moves.

3.) Gravity

The integumentary system functions to retain body fluids, protect against disease, eliminate waste products, and regulate body temperature. Cell membrane performs the same function as the integumentary system. Therefore, option A is correct.

The cell membrane performs a function that is similar to the integumentary system. The cell membrane is a thin, flexible layer that surrounds the cell and acts as a barrier between the cell and its external environment.

It helps to regulate the movement of substances in and out of the cell, maintain the balance of fluids and electrolytes, and protect the cell from harmful substances.

The cell membrane can also play a role in temperature regulation, as it helps to maintain the proper internal environment of the cell.

Thus, option A is correct.

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In the presence of excess oxygen, there is a greater production of CO2 and ATP molecules compared  to the absence of oxygen in anaerobic

respiration.

Glucose is the energy molecule that is the end product of the digestion of carbohydrates. During cellular respiration, the glucose molecule is broken down to release carbon dioxide, water and ATP.

In the presence of excess oxygen, there is a greater production of CO2 and ATP molecules compared  to the absence of oxygen in anaerobic

respiration.

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A base, according to the Arrhenius definition, is any species that increases the concentration of OH- in the solution. Some examples of bases are, NaOH, KOH, LiOH, all these substances will increase the concentration of OH when dissolved. Letter C

4Li + O₂ ⇒ 2Li₂O

Li₂O = 2/4 x 3.33 = 1.665

Explanation:

Gas is a state of matter that has no fixed shape and no fixed volume.

The value that is equivalent to 4 cups is d. 240 milliliters.

One cup is equal to 240 milliliters. Therefore, 4 cups can be calculated as follows:

4 cups x 240 milliliters/cup = 960 milliliters or 0.96 liters (rounded to two decimal places)

Option d, 240 milliliters, is equivalent to 4 cups and is the correct answer. Options a and c are close to the correct answer, but not equivalent to 4 cups. Option b, 20 milliliters, is much smaller than 4 cups and is not a reasonable conversion factor. Therefore, d. 240 milliliters, is the correct choice.

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One of the first chemicals used by Lister to prevent surgical infections was carbolic acid also known as Phenol which has antiseptic properties.

Joseph Lister, a British surgeon, is known for pioneering antiseptic techniques to prevent surgical infections in the 19th century. One of the key chemicals he used was carbolic acid, also known as phenol.

Lister observed that the high mortality rate from post-operative infections could be reduced by implementing strict antiseptic practices. He introduced the use of carbolic acid as a disinfectant during surgeries and for wound dressings. Carbolic acid has strong antiseptic properties and is effective in killing bacteria.

Lister would spray a diluted solution of carbolic acid in water over the surgical field and instruments, and he also used it to soak dressings. This practice helped to reduce the risk of infection by killing bacteria and preventing their growth.

The use of carbolic acid by Lister revolutionized surgical practices and significantly decreased the incidence of infections, leading to improved patient outcomes.

One of the first chemicals used by Lister to prevent surgical infections was carbolic acid (phenol). Its antiseptic properties played a crucial role in reducing the risk of infections during surgeries in the 19th century.

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Sophia is conducting an informational interview with the school band director. Therefore, Sophia's interview with the school band director is an informational interview as she is seeking information about a particular field.

Correct option is, b. an informational interview.

An informational interview is a type of interview in which the interviewer seeks information about a particular career, industry or job from someone who is already working in that field. In Sophia's case, she is seeking information about which musical instrument she would be most suited to play from the school band director.

An informational interview is a conversation between two people where one person seeks information and advice about a particular topic or industry from someone with knowledge and experience in that area. In this case, Sophia is seeking information from the school band director to determine the most suitable musical instrument for her to play.

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