for how many minutes must a current of 1.4 amp be provided to deliver 890 coulombs?group of answer choices121191010.595

Answer:

See explanation

Explanation:

Microwaves work by flipping water molecules upside down, then right side up again, and so on at very high speeds, and the friction generates heat. Some glass or plastic isn't affected by the microwaves, so the molecules don't get flipped, and so no friction occurs and no heat is produced, leading to the dish not being heated up.

9.14moles

According to the Avogadro's constant,

We are to determine the moles of 5.50 x 10^24 molecules of butane. This is expressed as:

Therefore the required mole of butane is 9.14moles

Answer:

Simple distillation is a method for separating the solvent from a solution.

Explanation:

For example, water can be separated from salt solution by simple distillation. This method works because water has a much lower boiling point than salt. When the solution is heated, the water evaporates.

Answer:

Stealing the last of your points on questions, it's been fun and I will most likely do it more in the future but for now this is the end. Thank you for the many points friend.

Explanation:

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Answer:

.02232 mole

Explanation:

At STP each 22.4 liters is a mole

.5 liters / 22.4 l/mole = .02232 mole

The final volume of the balloon is 0.61 L

The Ideal gas law is the equation of state of a hypothetical ideal gas. It is a good approximation to the behaviour of many gases under many conditions, although it has several limitations. The ideal gas equation can be written as-

                       PV = nRT

where,

P = Pressure

V = Volume

T = Temperature

n = number of moles

Given,

Initial volume = 0.55 L

Initial Pressure = 1 atm

Final pressure = 0.9 atm

P₁V₁ = P₂V₂

1 × 0.55 = 0.9 × V₂

V₂ = 0.61 L

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Answer:

13598 J

Explanation:

Q = m × c × ∆T

Where;

Q = amount of energy (J)

m = mass (grams)

c = specific heat capacity

∆T = change in temperature

m = 65g, specific heat capacity of water = 4.184J/g°C, initial temperature= 100°C, final temperature = 150°C

Q = 65 × 4.184 × (150 - 100)

Q = 271.96 × 50

Q = 13598 J

Hence, 13598 J of energy is required to boil 65 grams of 100°C water and then heat the steam to 150°C.

The answer would be the round- bottom flask. When setting up the distillation setup and the round-bottom flask port serves as the water inlet.

As the round-bottom flasks is used for the boiling and also known as boiling flask.

Hence it permit the flask to have a uniform heating all over the process. The heat dispense equally in the entire process.

It is also called as RB flask.

Discovered by Emil Erlenmeyer and this equipment made from Pyrex glass.

Round-bottom flasks are the kind of flasks having spherical bottoms used as experimental glassware, generally used for chemical or biochemical work.

Hence, The port farthest from the RB flask.

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While testing two pon sites , students found the water went from pH 7 at site a to pH 6 at site b .the students can conclude that the water at site b is 10x more acidic than the water at site a .

pH is the measure of acidity and basicity of a substance .

pH stands for hydrogen potential . it can be defined as the negative log of hydrogen ion concentration .

it can be measured by a pH scale , which ranges from 0 to 14 .

if the pH value is less than 7 , then the compound is called as acidic .

if the Ph value is greater than 7 , then the compound is called as basic .

if the pH is 7 , then the compound is called as neutral compound .

pH equals to 0 , called strongly acidic solution . pH equals to 14 is called strongly  basic solution .

pH does not have units .

The formula for pH is given by ,

pH = - log[H+]

pH zero for 1N solution of strong acid .

pH is negative for concentrations 2N, 3N ,10N of strong acids .

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573,213 Joules of energy is required to raise the temperature of the hydrogen gas from 0.0°C to 30.5°C.

To calculate the energy required to raise the temperature of the hydrogen gas, we can use the equation:

ΔE = n * Cv * ΔT

where:

ΔE is the change in energy,

n is the number of moles of gas,

Cv is the molar heat capacity at constant volume,

ΔT is the change in temperature.

First, we need to calculate the number of moles of hydrogen gas using the ideal gas law:

PV = nRT

where:

P is the pressure,

V is the volume,

n is the number of moles,

R is the ideal gas constant,

T is the temperature.

Rearranging the equation, we have:

n = PV / RT

Given:

P = 10.0 atm

V = 239 L

R = 8.314 J/(mol·K)

T1 = 0.0°C = 273.15 K (convert to Kelvin)

T2 = 30.5°C = 303.65 K (convert to Kelvin)

Cv = 20.4 J/(mol·K)

Now, let's calculate the number of moles of hydrogen gas:

n = (10.0 atm * 239 L) / (8.314 J/(mol·K) * 273.15 K)

n ≈ 92.05 moles

Next, we can calculate the change in energy using the equation mentioned earlier:

ΔE = n * Cv * ΔT

ΔE = 92.05 moles * 20.4 J/(mol·K) * (303.65 K - 273.15 K)

Calculating this expression will give us the energy required to raise the temperature of the hydrogen gas.

ΔE ≈ 573,213 J

Therefore, approximately 573,213 Joules of energy is required to raise the temperature of the hydrogen gas from 0.0°C to 30.5°C.

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Answer:

Explanation:

Decomposition reaction, also known as analysis or dissociation, is a type of chemical reaction in which a compound breaks down into simpler substances or elements. In this reaction, a single reactant undergoes a chemical change and produces two or more products.

The decomposition reaction can be represented by the general equation:

AB → A + B

Where AB is the reactant, and A and B are the products. The reactant AB is usually a compound, and it breaks down into its constituent elements or simpler compounds.

There are different types of decomposition reactions, including:

Thermal decomposition: It occurs when a compound is heated, resulting in its decomposition into simpler substances. For example, the thermal decomposition of calcium carbonate (CaCO3) produces calcium oxide (CaO) and carbon dioxide (CO2):

CaCO3 → CaO + CO2

Electrolytic decomposition: It takes place when an electric current is passed through an electrolyte, causing it to break down into its component ions. For instance, the electrolysis of water (H2O) leads to the decomposition into hydrogen gas (H2) and oxygen gas (O2):

2H2O → 2H2 + O2

Photochemical decomposition: It occurs when a compound undergoes decomposition due to exposure to light energy. Chlorine gas (Cl2) can decompose into chlorine atoms (Cl) under the influence of light:

Cl2 → 2Cl

These are just a few examples of decomposition reactions. They are important in various chemical processes and are used in industries, laboratory experiments, and natural phenomena. By understanding and controlling decomposition reactions, scientists can gain insights into the behavior of different compounds and develop practical applications in fields such as chemistry, materials science, and environmental science.

Answer:

Explanation:

reaction in which a compound breaks down into simpler substances or elements

Answer:

The Sun radiates huge amounts of energy. Only a small portion of that energy hits the Earth, but it is enough to light our days, heat our air and land, and create weather systems over the oceans. Most of the energy you will learn about comes from the Sun. The Earth also gives off energy.

Explanation:

Answer:

"The Sun radiates huge amounts of energy. Only a small portion of that energy hits the Earth, but it is enough to light our days, heat our air and land, and create weather systems over the oceans. Most of the energy you will learn about comes from the Sun. The Earth also gives off energy."

By the way I got this off thee internet and copy  and pasted it so don't write it just look and write in your own words please. Please do not copy and paste or write what i wrote because this is someone else's explanation or answer

Hope this helps!! Also please rank thank you.

Explanation:

Answer:

39.0525 Cm

Explanation:

Answer:

15 3/8 inches into cm: fifteen and three eights inches are equal to 15 3/8 x 2.54 = 39.0525 centimeters.

Explanation:

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In the reaction, A+ 3B -- > 2C + D the reaction is first order with respect to reactant A and second order with respect to reactant B. If the concentration of A is doubled and the concentration of B is halved, the rate of the reaction would be zero order by a factor of 1/2

The reaction given in the question is -

2A  + 3 B ---->  2C + D

From , the above reaction the rate law is written as -

rate = k [ A ]²[ B ]³

where ,

k = rate constant

In the above equation the order is determined by the sum of the powers of the concentrations , i.e. 2 + 3 = 5 order , which never possible ,

Hence , in the question ,

The by changing the concentration of B , the rate does not change .

hence , the rate is independent of the concentration of B .

Therefore ,

The order with respect to B will be zero .

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The final temperature of the substance cannot be determined without knowing the initial temperature or additional information.

To calculate the final temperature of the substance, we need to consider the heat exchange between the aluminum block and the water.

This can be done using the principle of conservation of energy.

First, let's determine the mass of water in grams, as the density of water is given as 1 g/mL and the volume of water is 220 mL:

Mass of water = Volume of water x Density of water

Mass of water = 220 mL x 1 g/mL

Mass of water = 220 g

Next, we need to determine the heat exchanged between the aluminum block and the water. The heat exchanged can be calculated using the formula:

q = m ˣ c ˣ ΔT

Where:

q is the heat exchanged

m is the mass of the substance (either aluminum or water)

c is the specific heat capacity of the substance

ΔT is the change in temperature

Assuming the specific heat capacity of aluminum is 0.897 J/g°C, and we have no information about the initial or final temperatures, we cannot calculate the final temperature of the substance accurately.

The specific heat capacity of water is approximately 4.18 J/g°C.

If you provide the initial temperature of the system or any additional information, I can assist you further in calculating the final temperature.

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Recrystalization will occur.The solution may become too diluted for crystals to form if you add too much solvent. Impurities will be captured by a hastily formed crystal's lattice. The crystals that result will also be smaller.

Recrystallization is a physical process used to separate compounds based on how soluble they are. Heating the material to dissolve the compound with impurities in a mixture of a suitable solvent completes the procedure. We can remove the desired chemical or contaminants from the mixture using this method.

The solution may become too diluted for crystals to form if you add too much solvent. The flask needs to be gently cooled, first at room temperature and then in cold water. Impurities will be captured by a hastily formed crystal's lattice. The resulting crystals will also be smaller.

The three main types of recrystallization are;

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Answer: increasing frequency or energy and decreasing wavelength.

Explanation:

Electromagnetic wave is defined as the wave which is associated with both electrical and magnetic component associated with them. They can travel in vacuum as well and travel with the speed of light i.e  

The electromagnetic spectra consist of radio waves, microwaves, infrared ,Visible , ultraviolet, X rays and gamma rays arranged in order of increasing frequency or increasing energy and decreasing wavelengths.

molecules are all in 7.12 mole or benzene was 4.70 x 24 molecular O E, therefore there are 67.94 x 1023 molecules in 1 liter of C6H6.

A mole of the a substance is the same number of molecules of the that substance that there are carbon-12 atoms in precisely 12 g of the element. This indicates that the molecular weight of any material, stated in terms of atomic mass units, is equivalent to 1 mole of that substance's weight in grammes.

Avogadro's number is an essential relationship to keep in mind: 1 mole=6.022×1023 6.022 x 10 23 ions, molecules, protons, etc. make up one mole. The molar amount must be multiplied by Avogadro's number to be converted to moles or atoms.

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Answer:

359

i think

Explanation:

The comparison between the class barometer data and the air pressure shown in the weather report serves as a means to evaluate the accuracy and effectiveness of the barometer's measurements.

The comparison between the data from the class barometer and the air pressure shown in the weather report revealed a correlation between the two measurements. The class barometer readings were likely taken at the same time as the weather report's air pressure measurement to ensure accurate comparison.

If the class barometer readings closely matched the air pressure indicated in the weather report, it would suggest that the barometer was functioning correctly and providing reliable measurements. This would indicate that the class barometer could be used as a reliable tool for monitoring air pressure changes.

However, if there were significant discrepancies between the class barometer readings and the air pressure reported in the weather report, it could indicate a calibration issue with the barometer or potential inaccuracies in its measurements. In such a case, it would be necessary to investigate the reasons behind the discrepancies and determine the reliability of the class barometer for future use. It helps to determine the barometer's reliability as a tool for monitoring air pressure changes in the local environment.

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In a duathlon, what is left out of a typical triathlon to create it is swimming. Cycling and running are the only two activities done in a duathlon.

A duathlon is an athletic race that combines two activities: running and cycling. Duathlons, like triathlons, are divided into several categories based on distance or age group, among other factors.

There are three varieties of duathlons: sprint duathlons, standard duathlons, and long course duathlons. Sprint duathlons are shorter, while standard duathlons are longer. Long course duathlons are the longest.

Triathlon is a sports event that consists of three activities: swimming, cycling, and running. The activities are done one after the other, with no break in between. Participants are timed from the beginning of the first task to the end of the last task. Each leg of the race must be completed before the next leg can begin. Triathlons are classified into various categories based on the distance of the race. Sprint triathlons, Olympic or standard triathlons, middle distance or half-Ironman triathlons, and long-distance or Ironman triathlons are the most popular categories.

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Answer:

The reason is carbon's ability to form stable bonds with many elements, including itself. 

Explanation:

This property allows carbon to form a huge variety of very large and complex molecules. In fact, there are nearly 10 million carbon-based compounds in living things!

Answer:

Explanation:

The reason is that carbon is able to form stable bonds with many elements, including itself, which allows carbon to form a huge variety of very large and complex molecules.

Explanation:

Plate tectonics is the movement of the earth's lithosphere above the asthenosphere below.

The plate motion results in the formation of new crusts on the earth. Also, they result in the destruction of the crust where necessary.

The process is Divergent boundaries, creating new crust by plate tectonics.

Tectonic plates are present in the Lithosphere which are moving slowly.

These plates move in different ways:

Some are moving towards each other.

Some are moving away from each other.

These plates cause earthquakes, volcanos, and the formation of new crust.

In Divergent boundaries, the plates move away from each other, which forms a new crust.

Thus, due to the process is Divergent boundaries, new crusts are formed by plate tectonics.

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40.55ml volume of acetone has a mass of 32.00 g.

Acetone is a common solvent with a density of 0.791 g/ml. Acetone is a chemical compound with the molecular formula C3H6O. It is a colorless, flammable liquid with a distinct odor.

Acetone is most commonly used as a solvent for cleaning and degreasing, but it also has a wide range of other uses, such as in the manufacture of plastics, pharmaceuticals, and cosmetics.

To calculate the volume of acetone with a mass of 32.00 g, we need to use the following equation:

Volume (ml) = Mass (g) / Density (g/ml)

Plugging in the given values, we get:

Volume (ml) = 32.00 g / 0.791 g/ml

Therefore, the volume of acetone with a mass of 32.00 g is 40.55 ml.

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Answer:

B

Explanation:

Answer:

bile salts emulsify fats and break them down into smaller particles which gives the enzyme lipase a greater surface area to act on during digestion of fats.

Explanation:

panjang banget gua kaga ngerti

Answer:

Answer 1- option c they have light and hollow bones

Answer2-ascaris

Answer 3-¿????

Answer 4th

Answer:

divide the mass of element in 1 mole of the compound by the compound's molar mass and multiply the answer by 100.

Explanation:

take the molar mass of hydrogen in the water molecule, divide by the total molar mass of water, and multiply by 100.

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