what is the speed of a skater who travels a distance of 210 m in a time of 10 seconds

Answer:

Its going to be C because the Skin Stem Cells are multipotent stem cells found in epidermis and hair follicles of adult, The skin of human goes constantly under replacement by new skin cells COURTESY skin stem cells. Skin stem cells also helps in skin repair after injury.

The function that skin stem cells perform is they significantly replace lost skin cells. Thus, the correct option is C.

Stem cells may be defined as cells that have the potential to develop into many different types of cells in the body depending on the number of cells and requirements.

Skin stem cells are multipotent in nature which means a stem cell can differentiate into a number of cell types but only those in a closely related family of cells.

Skin stem cells are active during the process of skin renewal that occurs throughout life. This process of self-renewal involves the replacement of lost skin cells that are damaged due to injury.

Therefore, the correct option for this question is C.

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Answer:

D

Explanation:

not all atoms would be the same size. As for they vary scaleing from left to right in the periodic table.

The volume that is occupied by the gas is obtained as  56 L.

We know that from the Avogadro's law, the volume that can be occupied by one mole of a gas is obtained as 22.4 L. This implies that we have to find the number of moles in the 70 g of the CO and then obtain the corresponding volume by simple proportion.

Number of moles of CO = 70.0 g/28 g/mol

= 2.5 moles

If 1 mole of the gas occupies 22.4 L

2.5 moles of the gas occupies 2.5 * 22.4/1 mole

= 56 L

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Answer:

Most are made of copper.

Explanation:

Answer: The answer is metal

Explanation:

I took the test:) np!

Answer:

17.1L

Explanation:

P1V1=P2V2 (Boyle's law)

760×4.5=200×V2

V2=760×4.5/200

V2=17.1L

N.B:if pressure reduces volume increases and vice visa

The answer is 17.1 L.

The volume of a gas at constant temperature varies inversely with the pressure exerted on it.

P1V1 = P2V2 (Boyle's law)

760 × 4.5 = 200 × V2

V2 = 760 × 4.5/200

V2 = 17.1 L

An example of Boyle's law in action can be seen in a balloon. Air is blown into the balloon; the pressure of that air pushes on the rubber, making the balloon expand. If one end of the balloon is squeezed, making the volume smaller, the pressure inside increases, making the un-squeezed part of the balloon expand out.

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The values of

Boiling point for the solution: 100.32°C

Freezing point for the solution: -1.15°C

Osmotic pressure for the solution at 20°C: 13.9 atm

we know that

Mass = \(volume \times density\)

Mass = \(1.039 \times 1000 = 1039\)gm solution

Then the amount of the solute and solvent are

Mass = \(0.10 \times 1039 = 103.9 g\) solute

Mass = \(0.9 \times 1039 = 935.1g\) solvent

now moles of glucose = \(\frac{103.9}{180} = 0.577 moles\)

now molarity M = \(\dfrac{moles}{volume} = \dfrac{0.577}{1} = 0.577\)

we know that

\(\Delta T = K_b \times m = 0.577 \times 0.617 = 0.32\)

hence the boiling point is

\(\Delta T = T_b - T\\T_b = 100 + 0.32 = 100.32\)

osmotic pressure = \(\pi = MRT\\\pi = 0.577 \times 0.082 \times 293 =13.9 atm\)

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Color, mass, shape, and density are all examples of physical properties.

Physical properties are characteristics or attributes of a substance that can be observed or measured without changing the substance's chemical composition. These properties provide information about the physical behavior and characteristics of a material.

Examples; Color is the visual perception of different wavelengths of light reflected or absorbed by an object. It is a physical property that helps distinguish and identify substances based on their appearance.

Mass is the amount of matter which is present in an object. It is a measure of the inertia of an object, representing its resistance to acceleration. Mass is a fundamental physical property and is typically measured in grams or kilograms.

Shape will refers to the geometric form or configuration of an object. It describes the overall outline or structure of an object and is a physical property that can vary depending on the material and its arrangement.

Density will be the mass per unit volume of a substance. It represents how tightly packed the particles are within a given volume. Density is a physical property that can provide information about the compactness or concentration of a material.

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Color, mass, shape, and density are examples of physical properties. They can be observed or measured without altering the substance's composition.

Color, mass, shape, and density are all examples of physical properties. Physical properties are characteristics that can be observed or measured without changing the substance's composition. For example, color is a physical property because you can observe it without altering the substance. Similarly, mass and density can be measured without changing the composition of a substance. The shape of an object is also a physical property, as it can be observed and measured without changing the composition of the material.

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4FeO + O2 → 2Fe2O3; ΔH = −560.66 kJ

3.8 moles will evolve 532.63 kJ

An exothermic reaction is a chemical reaction that releases heat or energy to its surroundings. In other words, it is a reaction in which energy is transferred from the system to the surroundings. During an exothermic reaction, the products of the reaction have less energy than the reactants, and the difference in energy is released in the form of heat or radiation.

When we have 3.8 moles of FeO;

If 4 moles does evolve 560.66 kJ

3.8 moles will evolve 3.8 * 560.66 kJ/4

= 532.63 kJ

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Answer:

1) Tin. It is stable to water under ambient conditions but on heating with steam, tin reacts with water to from tin dioxide and hydrogen. It is stable in air under ambient conditions but on heating in air or oxygen, tin reacts with oxygen to from tin dioxide.

2) Nitric oxide combines with water vapour in the atmosphere to form nitric acid, which is one of the components of acid rain. Heightened levels of atmospheric nitric oxide resulting from industrial activity were also one of the causes of gradual depletion of the ozone layer in the upper atmosphere.

Explanation:

cooked rice

nutrient

carbohydrate.

Boiler eggs

nutrient

Protein.

The mass of the isotope that will remain after seven half-lives is 2.69 grams.

Half -life of a substance is defined as the time which is required for half of the quantity of a radioactive substance to get decayed.It is a term which is used in nuclear chemistry for describing how quickly unstable atoms undergo radioactive decay into other nuclear species by emitting particles or the time which is required for number of disintegrations per second of radioactive material to decrease by one half of its initial value.

After 1 st half life:345/2=172.5 g

After 2 nd half life:172.5/2=86.25 g

After 3 rd half life:86.25/2=43.12 g

After 4 th half life:43.12/2=21.56 g

After 5 th half life:21.56/2=10.78 g

After 6th half life:10.78/2=5.39 g

After 7th half life:5.39/2=2.69 g

Thus, the mass of the isotope that will remain after seven half-lives is 2.69 grams.

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Answer:

Explanation:

Here, we want to check if the equation of the reaction is balanced or not

Now, for a balanced equation of reaction, the number of atoms of the individual elements on both sides of the equation is equal

Now, let us check the atoms:

We have 1 Sr on both sides

We have 1 SO4 on both sides

We have 1 Mg on both sides

We have 2 OH on both sides

From what we can see, the equation of the reaction is balanced

Thus, the correct answer choice is B

Answer: Yes.

Explanation:

the number of protons in the nucleus determines an element's identity. Chemical changes do not affect the nucleus, so chemical changes cannot change one type of atom into another. The number of protons in a nucleus does change sometimes, however. The identity of the atom, therefore, changes.

Thermolysis, photolysis, and electrolysis are three different forms of breakdown reactions. A single source was cooked to yield two or more objects in each instance (decomposition).

Decomposition reactions happen when complex chemical entities split apart into smaller components. Decomposition reactions often demand energy input. For instance, the thermal breakdown of potassium hydroxide (KClO3) is a typical technique used during laboratories to generate oxygen gas.

Below is a typical illustration of a thermal breakdown reaction. Calcite breaks down into calcareous dioxide and atmospheric co2 when heated. The production of quick lime, a crucial component in numerous industries, uses this procedure.

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The correct response is: "The absorption band between 250 and 320 nanometers is due to transitions in electronic energy levels, and the absorption band between 380 and 520 nanometers is due to transitions in molecular vibrational levels."

The correct statement about the absorption bands in the spectrum of beta-carotene, an organic compound, is: "The absorption band between 250 and 320 nanometers is due to transitions in electronic energy levels, and the absorption band between 380 and 520 nanometers is due to transitions in molecular vibrational levels."The absorption band between 250 and 320 nanometers is due to transitions in electronic energy levels, and the absorption band between 380 and 520 nanometers is due to transitions in molecular vibrational levels."

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Answer: sand, silt, and clay.

Answer:

6.005109 x 10⁸

Explanation:

Given expression:

      (0.003999 x 10⁸) + (6.00111 x 10⁸)

Now, to solve for this sum,

   take the coefficient and sum:

     =  (0.003999 + 6.00111) x 10⁸

     = 6.005109 x 10⁸

In this kind of problem, just make sure the exponent parts are the same then add the coefficient together.

The formula mass of Ca(OH)2 is 74( 40+16*2+1*2). It is just the sum of their atomic masses.

To calculate the formula mass of Ca(OH)2, we need to determine the atomic masses of each element present in the compound and then sum them up.

The atomic mass of calcium (Ca) is approximately 40.08 g/mol. Oxygen (O) has an atomic mass of approximately 16.00 g/mol, and hydrogen (H) has an atomic mass of approximately 1.01 g/mol.

The formula Ca(OH)2 indicates that there are one calcium atom, two hydroxide ions, and two oxygen atoms in the compound. The hydroxide ion (OH-) consists of one oxygen atom and one hydrogen atom.

The formula mass can be calculated as follows:

Formula mass = (atomic mass of Ca) + (2 × atomic mass of O) + (2 × (atomic mass of H + atomic mass of O))

The formula mass of Ca(OH)2 is 74( 40+16*2+1*2).

It is just the sum of their atomic masses.

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Answer:

=71.439911 u

Explanation:

We know that 1 mass of hydrogen atom = 1.00784 u

If it's measured at 72u: 72/1.00784=71.439911 u

Mass of 1 mol hydrogen atoms =1.00784u

Total mass in 72u

The half-life of 131i is 0.220 years. 496 (in mg) of a 500.0 mg sample remains after 24 hours

The amount of time it takes for a species' concentration to drop to half of its starting value in a chemical reaction is known as its half-life. The reactant's half-life in a first-order reaction is equal to ln(2)/k, where k is the reaction rate constant.

The amount of time needed for the reactant concentration to drop to half its initial value is known as the half-life of a reaction. The interval of time needed for one-half of the atomic nuclei in a radioactive sample to decay (change spontaneously into other nuclear species by emitting particles and energy), or, alternatively, the time interval needed for one nuclear species to change into another nuclear species, is known as the half-life of a first-order reaction.

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Answer:

C. About 50 more grams ammonia would be able to dissolve as the solution has become unsaturated

Explanation:

From the question, we have;

The mass of ammonia dissolved in water = 60 grams

The mass of the water solvent which dissolves the ammonia = 100 g

The temperature to which the ammonia water solution is raised = 90°C

Therefore, given that the solubility of a solute in a solvent increases with temperature, when the temperature is raised, we have, that the solution will more unsaturated and will be able to dissolve more ammonia, therefore, option 'C' is the most correct option that corresponds with the relationship of temperature and solubility

a) To solve for the k value in the equation T(t) = 70 + 142ekt, we can use the given information that the coffee temperature at 10 minutes was 110°F.

Substituting t = 10 and T(t) = 110 into the equation, we have:110 = 70 + 142ek(10). Subtracting 70 from both sides, we get: 40 = 142ek(10). Dividing both sides by 142, we have: ek(10) = 40/142. Taking the natural logarithm (ln) of both sides, we get: ln(ek(10)) = ln(40/142). Simplifying, we have: k(10) = ln(40/142). Dividing both sides by 10, we get: k = ln(40/142) / 10. Using a calculator, we find that k ≈ -0.0131. b) To find T(t) at 19.5 minutes, we can substitute t = 19.5 into the equation T(t) = 70 + 142ekt: T(19.5) = 70 + 142e(-0.0131)(19.5) Using a calculator, we can evaluate the expression to find T(19.5) ≈ 99.6°F. a) The decay of Lidocaine can be modeled using the equation L(t) = aekt. Given that the half-life of Lidocaine is about 1.5 hours, we can use this information to solve for the k value. Using the half-life formula, we know that: t1/2 = (ln 2) / k. Substituting t1/2 = 1.5 hours, we have: 1.5 = (ln 2) / k. Solving for k, we get: k = (ln 2) / 1.5. Using a calculator, we find that k ≈ 0.4621. b) The exponential model for Lidocaine decay is given by : L(t) = aekt. c) To find how long it will take for the amount of Lidocaine to reduce to 20 mg, we can substitute L(t) = 20 and solve for t. 20 = 200e0.4621t. Dividing both sides by 200, we have: 0.1 = e0.4621t. Taking the natural logarithm (ln) of both sides, we get: ln(0.1) = 0.4621t. Simplifying, we have: t = ln(0.1) / 0.4621. Using a calculator, we find that t ≈ 2.7 hours. Rounded to the tenths, it will take approximately 2.7 hours for the amount of Lidocaine to reduce to 20 mg.

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Answer:

C8H18

Explanation:

Answer: The name of the salt produced is Calcium Sulphate.

Explanation:

we know, whenever an acid reacts with a base, we get a salt and water.

In the given question, Calcium Hydroxide is a base and Sulfuric acid is an acid.

When Calcium Hydroxide reacts with Sulfuric Acid, we get Calcium Sulphate and Water.

The required balanced chemical reaction is:-

Ca(OH)2 + H2SO4 = CaSO4 + 2H2O

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Decene has a chemical formula of and has 75 isomers. In this example, all alkanes up to ten carbon atoms in length are meticulously listed starting with methane and proceeding in this manner.

A nuclide isomeric with one or more others is one of two or more molecules, radicals, or ions that have the same number of atoms of the same elements but differ in their structural arrangement and characteristics.

The isomers known as structural isomers have the same chemical formulae but have their atoms totally rearranged in a different order. These are molecules with the same type of molecular formula but various connectivities based on the order in which they are assembled.

Carbon chains have the potential to branch, these isomers are created. For instance, the chemical butane, C4H10, has two isomers. One of them has a "straight chain" of carbon atoms, whereas the other has a branched chain.

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Answer:

ok so thus Is Easy Ford you

Explanation:

because you learned that

Answer:

2.39×10¯⁵ m²

Explanation:

From the question given above, the following data were obtained:

Distance (d) = 8.08×10¯⁵ m

Charge (q) = 2.24×10¯⁹ C

Potential difference = 855 V

Area(A) =?

NOTE: Permittivity (ε₀) = 8.854×10¯¹² F/m

The area can be obtained as follow:

q = ε₀AV/d

2.24×10¯⁹ = 8.854×10¯¹² × A × 855 / 8.08×10¯⁵

2.24×10¯⁹ = 7.57×10¯⁹ × A / 8.08×10¯⁵

Cross multiply

7.75×10¯⁹ × A = 2.24×10¯⁹ × 8.08×10¯⁵

7.75×10¯⁹ × A = 1.81×10¯¹³

Divide both side by 7.75×10¯⁹

A = 1.81×10¯¹³ / 7.75×10¯⁹

A = 2.39×10¯⁵ m²

Thus, the area of the plate is 2.34×10¯⁵ m²

Answer:

2.39

Explanation: