Methyl 4-methoxycinnamate is a sunscreen analog. What properties make it an effective sunscreen?

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

\(volume = \frac{mass}{density} \\ \)

From the question

mass of wood = 44 g

density = 0.531 g/cm³

It's volume is

\(volume = \frac{44}{0.531} \\ = 82.86252354...\)

We have the final answer as

Hope this helps you

Answer:

A) It shows how electrons are distributed in the Shells of an Iron atom.

Explanation: Took the test on Edge

To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, the correct option is option A.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.

In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron. The given model shows how electrons are distributed in the shells of an iron atom.

Therefore, the correct option is option A.

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Answer:

Sodium (Na) — Will lose electrons

Silicon (Si) — Will lose electrons

Argon (Ar) — No reaction

Hope this helps.

The statement that describes a casual relationship between two variables would be a correlation.

Correlation is a statistical term used to describe the relationship between two variables. The strength of the correlation between two variables is measured by a factor known as the correlation coefficient. The correlation coefficient is represented by r.

The value of r ranges from -1 to +1.

Thus, the casual realtionship between two variables is best described as correlation.

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Answer:a mouse

Explanation:

Answer: a mouse

Explanation:

The specific heat capacity of the alloy that requires 49.1 kj to raise the temperature of 180.7 g alloy from 217 k to 489 k is approximately 0.815 J/g°C.

Using the formula below, we can calculate the alloy's specific heat capacity (c) in joules per gram per degree Celsius (J/g°C):

q = mcΔT

Where q is the heat energy, m is the mass of the alloy, c is the specific heat capacity of the alloy, and T is the temperature change in degrees Celsius.

provided values

Given that 1 kJ = 1,000 J, q = 49.1 kJ = 49,100 J.

m = 180.7 g

ΔT = 489 K - 217 K = 272 K

We can find c by rearranging the formula:

c = q / (m * ΔT)

replacing the specified values:

c = 49,100 J / (180.7 g * 272 K)

c ≈ 0.815 J/g°C

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Answer:

NA = 6.02214076×10^23 mol−1.

Explanation:

1 mole of helium gas contains 6.02 x10^23 helium atoms. So multiply this by 3 after solving the equation.

There are 1.8066 x 10 ^24 atoms in 3 moles of helium

1 mole of any substance is equal to 6.022 × 1023 atoms , This is called the  Avogadro's Number and it represents 12 grams of pure carbon.

Hence,

I mole of Helium = 6.022 × 1023 atoms

Therefore,  

3 moles of helium will be 3 x   6.022 × 1023 atoms

3 moles of helium =1.8066 x 10 ^24 atoms

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The balanced chemical reaction for methanol (CH3OH) combustion in oxygen (O2) is given by : CH3OH (l) + 1.5O2 (g) → CO2 (g) + 2H2O (g)

The balanced chemical reaction for methanol (CH3OH) combustion in oxygen (O2) is given by :

CH3OH (l) + 1.5O2 (g) → CO2 (g) + 2H2O (g)

The states of the chemical substances involved in the reaction are as follows :

Methanol: Liquid (l)

Oxygen: Gas (g)

Carbon dioxide: Gas (g)

Water: Gas (g)

When methanol is burned in oxygen, the products of the combustion are carbon dioxide and water vapor. In order to balance the chemical equation, we need to make sure that the number of atoms of each element is the same on both sides of the equation.

The reaction is exothermic, meaning that it releases heat. This heat can be used to generate electricity or to heat homes and businesses. Methanol combustion is also a source of carbon dioxide emissions, which contribute to climate change.

Thus, the balanced chemical reaction is given above.

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Answer:

The lack of heat

Explanation:

when vapor gets cold enough, it reverts back to a liquid, when liquid gets cold enough, it freezes into a solid.

Answer:

The evidence of matter scattering light wave in many different directions is;

D. The colors on the water's surface match the colors in the sky

Explanation:

Light scattering is used to describe the sending of a given beam of light in many directions (by tiny particles) when the light passes through a medium, due to the disruption of the bath of the light ray as it bumps into the tiny particles

Water has the nature of absorbing the red light. The light that enters the water is scattered by the tiny particles in the water such that the blue light which is the spectrum of light water allows to pass through is reflected along with the reflection of the sky and the colors of the water surface match the colors of the sky.

Answer:

C.

Explanation:

I took the quiz

Answer:

https://newshamchem.weebly.com/uploads/2/2/0/3/22035226/molarity_&_worksheet_answer.pdf

question 9.

Explanation:

Answer:

.0125 moles

Explanation:

Molarity = moles/volume

.05 M = moles/.250L

.0125 = moles

Answer: 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.

The frequency of a red laser that has a wavelength of 676 nm would be 4.43 x \(10^{14\) hertz.

The frequency and wavelength of a wave are related by the following equation:

λf = c

Where λ is the wavelength of the wave in meters, f is the frequency in Hertz, and c is the speed of light in a vacuum.

in this case, λ = 676 nm = 6.76 x \(10^{-7\) m

c = 299,792,458 m/s

Making f the subject of the formula:

f = c/λ

  = 299,792,458/6.76 x \(10^{-7\)

  = 4.43 x \(10^{14\) hertz

In other words, the frequency of a red laser that has a wavelength of 676 nm would be 4.43 x \(10^{14\) hertz.

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Answer:

Of the outlined, a robot moves. responds to stimuli from control system and dies.

Explanation:

Living things have the following basic characteristics:

Movement (R)

Reproduce (N)

Nutrition (N)

Irritability (R)

Grow (N)

Excrete(N)

Respire (N)

Die (N)

I hope this was helpful.

Answer:

112.625 mL

Explanation:

Applying,

ML = M'L'.................... Equation 1

Where M = Initial molarity or concentration of calcium chloride, L = initial volume of calcium chloride, M' = Final molarity of calcuim chloride, L' = Final volume of calcuim chloride.

make L the subeject of the equation

L = M'L'/M................ Equation 2

From the question,

Given: M = 1.60 mol/L, M' = 0.34 mol/L, L' = 530 mL

Substitute these values into equation 2

L = (0.34×530)/1.60

L = 112.625 mL

Answer: This is the process of chemical change. Examples of chemical properties are flammability (a material's ability to burn in the presence of oxygen) and reactivity (how easily a material combines chemically with other materials).

Explanation: Chemical properties are properties that can be measured or observed only when matter undergoes a change to become an entirely different kind of matter. They include reactivity, flammability, and the ability to rust. ... Flammability is the ability of matter to burn. Burning of wood is a chemical change as new substances which cannot be changed back (e.g. carbon dioxide) are formed. For example, if wood is burned in a fireplace, there is not wood anymore but ash. ... Special details which do not change in a substance without new substances being formed are called physical properties.

Answer:

chemical property

Explanation:

The detector with the highest sensitivity for determination of acetone is the flame ionization detector.

Flame ionization detector is the most widely used detector for gas chromatography. It is highly sensitive for organic compounds like acetone. FID detectors are best suited for organic compounds, and they work on the principle that the organic compounds get ionized by the hydrogen flame and generate electrons.

These electrons pass through an electrical field, which produces a signal that is proportional to the number of ions present. This detector has the highest sensitivity for determination of acetone.

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The combustion of natural gas and hot drink cooling to room temperature. Both are spontaneous processes.

The spontaneous process is one in which energy is released and advances in the direction of a lower energy state that is more thermodynamically stable. Natural processes are always unplanned.

In the posted question, there are two spontaneous processes:

(1) A warm beverage that cools to room temperature: This results in a loss of energy and is a natural process—and as we all know, natural processes are all spontaneous.

(2) Natural gas combustion: A fire is an illustration of an exothermic reaction. Energy is lost during burning, which also results in a rise in entropy. Therefore, this procedure happens on its own.

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Answer:

False

Explanation:

Triple covalent bonds are much more stronger than single covalent bonds. In single bond, 2 electrons are shared, in double bond four electrons are shared and in triple bond six electrons are shared. Thus, triple bond is difficult to break since it is the strongest bond. Between the two atoms, stronger the bond, more stable the molecule. Thus, triple bond is more stable.

Answer:

Found in every living cell

Ideally, the molar volume of a gas is 22.414 L at 1 atm and 25°C (I). The van der Waals "a" is greater for SO₂(g) than for He(g) (II) due to stronger attractive forces in SO₂. For most gases, the slope of the PV/RT vs. Pext plot is initially negative (III) because interparticular attractions lower gas pressure.(I,II,III)

Statement I is true based on the ideal gas law. Statement II is true because SO₂ is a larger, more complex molecule with stronger attractive forces, resulting in a larger van der Waals constant "a."

Statement III is true as interparticular attractions at low temperature and high pressure decrease collision frequency, lowering gas pressure. Statement IV is incorrect because the van der Waals "b" constant indicates the particle volume, not the strength of intermolecular forces..(I,II,III)

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The volume of concentrated aqueous ammonia must be diluted to 1.00 l to make a solution that has a molarity of 1.85 m. concentrated nh3 (aq) is 15 m. report the volume of concentrated aqueous ammonia in milliliters is 123 mL

The number of moles of solute must always remain constant while diluting solutions, which is the most crucial thing to remember.

In other words, the amount of solute in the concentrated sample must be identical to the amount of solute in the diluted solution.

The concentration is the number of moles per unit volume. So

c=n/V

n=CV

n= 1.85x1

n=1.85

Now your task is to determine what volume of the concentrated solution would contain this many moles of ammonia.

Plugging the values, we get

V=1.85/15

V=0.123 L

Now for dilution calculations, we have

C1V1=C2V2

V1=C2/C1.V2

V1=1.85/15x1.00= 123 mL

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Fusion Nuclear fusion is a response wherein two or greater atomic nuclei are blended to shape one or greater different atomic nuclei and subatomic debris. It

1. involves the splitting of nuclei

2. releases large amounts of energy

4. releases radiation as a waste product

5. occurs in nuclear power plants and is used to generate electricity.

Fusion reactions power the sun and other stars. In a fusion reaction,  light nuclei merge to form a single heavier nucleus. The technique releases electricity due to the fact the total mass of the resulting unmarried nucleus is much less than the mass of the two unique nuclei. The leftover mass becomes energy. The difference in mass between the reactants and merchandise is manifested as either the discharge or absorption of power.

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Answer:

2, 5, 6

Explanation:

edge 2023

Answer:

The tannin level of the fruit is significant, making the unripe fruit astringent and bitter. As the fruit develops, the tannin content decreases.

o2 is made and hydrogen help make it

Answer:

a force is push or pull that act on object as a result of object interaction its surrounding.

Explanation:

Answer:

(14.5 mol) x (6.022 x 10^23 atoms/mol) = 8.73 × 10^24 atoms

Explanation:

pls mark brainliest

Answer: The combination of 100 mL of 1.0 M CH3NH2 and 100 mL of 0.50 M CH3NH3 would result in a buffer solution.

Explanation:

A buffer solution is a solution that can resist changes in pH upon the addition of an acid or a base. To form a buffer solution, we need a weak acid (or base) and its conjugate base (or acid) in similar concentrations.

Option 1: 100 mL of 1.0 M HCl and 50.0 mL of 1.0 M NaCl

This is not a buffer solution because HCl is a strong acid and NaCl is a neutral salt, which does not have an acidic or basic effect on the solution.

Option 2: 100 mL of 1.0 M HNO2 and 100 mL of 2.0 M NaNO2

This is not a buffer solution because HNO2 is a weak acid, but NaNO2 is not its conjugate base. Instead, NaNO2 hydrolyzes to form NaOH and HNO2, which decreases the buffer capacity.

Option 3: 100 mL of 1.0 M CH3NH2 and 100 mL of 0.50 M CH3NH3

This is a buffer solution because CH3NH2 is a weak base and CH3NH3+ is its conjugate acid. They are in similar concentrations, and therefore, can resist changes in pH upon the addition of an acid or a base.

Option 4: 100 mL of 1.0 M HF and 50.0 mL of 1.0 M HClO

This is not a buffer solution because HF is a weak acid, but HClO is not its conjugate base. Instead, HClO hydrolyzes to form H3O+ and ClO-, which decreases the buffer capacity.