Would a candle burning be a chemical or physical change? Why?

Answer:

I think the answer is 4) 41

Explanation:

APE= atomic number, proton and the electrons are the same number

MAN= mass = atomic number - neutrons

121 - 80 = 41

i haven't done this in a while so hope this helps :)

Thermoreceptors are stimulated by the temperature change.

The thermoreceptor is the sensory receptor or, the more accurately, it will be the receptive portion of the sensory neuron that will codes the absolute and the relative changes in the temperature, that will primarily is in the innocuous of the range.

Thermoreceptors are of the two types, the warmth and cold. The warmth fibers that are excited by the rising temperature and it will inhibited by the falling the temperature, and the cold fibers will be respond in the opposite manner. Thermoreceptors are the selectively sensitive to the specific ranges of the temperature.

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Answer:

1 quartz

Explanation:

pls tell me if I'm wrong

Quartz can be found in the rocks phyllite, sandstone, and granite.

Hence, Option (1) is correct answer.

Rock phyllite are composed of mainly quartz, mica and chlorites. It is a soft and durable rock.

Sandstone are composed of mainly quartz, feldspar and lithic fragments. It is a sedimentary rock.

Granite are composed of three minerals mainly that is quartz, plagioclase and potassium feldspar and usually carry mica or hornblende. It is a light coloured igneous rock.

Thus from above conclusion we can say that Quartz can be found in the rocks phyllite, sandstone, and granite.

Hence, Option (1) is correct answer.

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The order of the four liquids in the test tube based on their densities, from top to bottom, is as follows: Oil, Water, Honey, and Mercury.

In a test tube, the liquids will arrange themselves in order of increasing density. The least dense liquid will float on top, while the denser liquids will sink below. The first liquid, oil, has the lowest density and will float on top. Next, water, with a higher density, will settle beneath the oil.

Following water, honey, which is denser than water, will sink further down. Lastly, mercury, being the densest of the four liquids, will settle at the bottom of the test tube. This arrangement is a result of the liquids' different densities, with the denser liquids displacing the less dense ones.

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The mole fraction of solute (\(sodium chloride\)) in a 3.0 m solution is 0.00299, and the mole fraction solvent (\(water\)) is 0.997.

To calculate the mole fraction of solute and solvent in a solution of sodium chloride, we first need to know the identity of the solvent. Assuming that the solvent is water, we can use the following formula:

mole fraction of solute = moles of solute / total moles of solution

mole fraction of solvent = moles of solvent / total moles of solution

To determine the moles of solute in a 3.0 m solution of sodium chloride, we need to know the molarity and the volume of the solution. Let's assume that we have 1 liter of the solution, since the molarity is given in terms of moles per liter (m).

The molarity (\(M\)) of a solution is defined as moles of solute per liter of solution, so we can use the following formula to calculate the number of moles of sodium chloride (\(NaCl\)) in the solution:

moles of \(NaCl\) = molarity x volume of solution

moles of \(NaCl\) = 3.0 mol/L x 1.0 L

moles of \(NaCl\) = 3.0 moles

Now that we know the number of moles of \(NaCl\)in the solution, we can calculate the mole fraction of solute:

mole fraction of solute = moles of solute / total moles of solution

mole fraction of solute = 3.0 moles \(NaCl\)/ (3.0 moles \(NaCl\)+ 1000 moles \(H2O\))

mole fraction of solute = 3.0 / 1003.0

mole fraction of solute = 0.00299

To calculate the mole fraction of solvent, we need to subtract the moles of solute from the total number of moles of solution:

total moles of solution = moles of solute + moles of solvent

moles of solvent = total moles of solution - moles of solute

moles of solvent = 1000 moles \(H2O\)- 3.0 moles \(NaCl\)

moles of solvent = 997.0 moles \(H2O\)

Now we can calculate the mole fraction of solvent:

mole fraction of solvent = moles of solvent / total moles of solution

mole fraction of solvent = 997.0 moles \(H2O\)/ (3.0 moles \(NaCl\)+ 997.0 moles \(H2O\))

mole fraction of solvent = 0.997

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Answer:

in physics, a vapor or vapour is a substance in the gas phase at a temperature lower than its critical temperature, which means that the vapor can be condensed to a liquid by increasing the pressure on it without reducing the temperature. A vapor is different from an aerosol.

Explanation:

Answer:

Give them each one so all of you is 8

Explanation:

I hope it helps:)

Fred and Florence have a combined total of 14 markers. Meaning, the amount of markers between all three is 24. If Maggie gives one marker to Fred and one marker to Florence, then each of them will have 8 markers.

The pressure of the gas in the aerosol container at 95°C would be 7.47 atm. Therefore, storing it at temperatures above 95°C is dangerous. The gas pressure in the container depends on its temperature and volume. The pressure of the gas in the aerosol container at 95°C would be 4.31 atm. Storing it at temperatures above 95°C is dangerous.

Given, The pressure of the gas in an aerosol container is 3.50 atm. The temperature of the gas is 24.0°C.The temperature above which it should not be stored is 95°C.The relationship between the pressure, volume, and temperature of a gas is given by the ideal gas law PV = nRT where P is the pressure, V is the volume, n is the number of moles, R is the universal gas constant, and T is the temperature. The given pressure of the gas is 3.50 atm and the temperature is 24.0°C. Hence, we need to convert it to Kelvin as follows:24.0°C + 273 = 297KThe temperature at which the aerosol container should not be stored is 95°C. Therefore, we need to convert this temperature into Kelvin as follows:95°C + 273 = 368KNow we can calculate the pressure of the gas at the given temperature using the ideal gas law: n, V, and R are constants, so we can write: P₁/T₁ = P₂/T₂ Thus, 3.50/297 = P₂/368Solving for P₂, we get: P₂ = 3.50 × 368/297P₂ = 4.31 atm Therefore, the pressure of the gas in the aerosol container at 95°C would be 4.31 atm. Storing it at temperatures above 95°C is dangerous.

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The value of the base ionization constant (Kb) is approximately 2.592. To calculate the value of the base ionization constant (Kb) using the given information, we need to use the concept of percent ionization and equilibrium expressions.

The percent ionization is defined as the ratio of the concentration of ionized base to the initial concentration of the base, multiplied by 100.

Given:

Initial concentration of the base (B): [B] = 0.0800 M

Percent ionization: 18% = 0.18

Let's assume that the equilibrium concentration of the ionized base is x M. Therefore, the concentration of the remaining unionized base would be ([B] - x) M.

The percent ionization can be expressed as:

percent ionization = (concentration of ionized base / initial concentration of base) * 100

0.18 = (x / 0.0800) * 100

Simplifying the equation:

0.18 = (x / 0.0800) * 100

0.18 = 1.25x

Now, let's solve for the equilibrium concentration of the ionized base (x):

x = 0.18 / 1.25

x = 0.144 M

Since the concentration of the ionized base is equal to the concentration of hydroxide ions ([OH-]) in the solution, we can consider [OH-] as 0.144 M.

Now, we can write the equilibrium expression for the base ionization reaction:

B + H2O ⇌ BH+ + OH-

The equilibrium constant (Kb) can be defined as the ratio of the product concentrations (BH+ and OH-) to the reactant concentration ([B] and [H2O]). In this case, since [H2O] remains relatively constant, we can omit it from the expression:

Kb = ([BH+] * [OH-]) / [B]

Substituting the values:

Kb = (0.144 * 0.144) / 0.0800

Calculating Kb:

Kb = 0.20736 / 0.0800

Kb ≈ 2.592

Therefore, the value of the base ionization constant (Kb) is approximately 2.592.

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Answer:

The volume of the helium balloon is 0.306 L.

Explanation:

Boyle's law states that the volume occupied by a given gaseous mass at constant temperature is inversely proportional to pressure. That is, if the pressure increases, the volume decreases, while if the pressure decreases, the volume increases.

Mathematically, Boyle's law indicates that the product of pressure and volume always has the same value:

P*V= k

Assuming that you have a certain volume of gas V1 that is at a pressure P1 at the beginning, by varying the volume of gas to a new value V2, then the pressure will change to P2, and it will be fulfilled:

P1*V1= P2*V2

In this case:

Replacing:

2 atm* 0.15 L= 0.97 atm* V2

Solving:

\(V2= \frac{2 atm* 0.15 L}{0.97 atm}\)

V2= 0.306 L

The volume of the helium balloon is 0.306 L.

Answer:

Li2CO3+CaCl2=CaCO3+LiCl

Answer:

4.5x10⁻¹¹M is the hydronium ion concentration

Explanation:

To solve this concentration we must find, as first, the molar concentration of OH-, [OH-]. With [OH-] we can find pOH, pH, and [H+], hydronium ion concentration, as follows:

[OH-]:

1mol of Ca(OH)2 contains 2 moles of OH-:

0.00011M Ca(OH)2 * (2moles OH- / 1mol Ca(OH)2) = 0.00022M OH-

pOH:

pOH = -log[OH-]

pOH = 3.658

pH:

pH = 14-pOH

pH = 10.34

[H+]:

10^-pH

When fossil fuels are burnt, CO2 is released into the air and is taken up by plants during photosynthesis to form glucose and subsequently starch.

Fossil fuels contain a large proportion of carbon atoms. When fossil fuels are burnt, these carbon atoms are released as carbon dioxide and escape to the atmosphere as atmospheric CO2 in air.

Recall that plants take up the CO2 in air during the process of photosynthesis. This CO2 becomes combined with water in the presence of sunlight to form glucose.

This glucose is converted to starch and stored in plant tissues. This is how the  carbon atom inside a fossil fuel  becomes a carbon atom inside a plant.

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Answer:

Explanation:

I'm not sure what you mean by the units. The answer using kg and ms is 23000 * 50 = 1150000 kg m/s

Here, sodium is allowed to shift from 4p to 4s, and its wavelength is 2.214 m. A wave's wavelength is described as the characteristic that measures the separation between adjacent spots.

Calculations are made between the two succeeding waves. The Greek letter lambda () is used to represent it. Thus, the wavelength is defined as the separation between one wave's crest or trough and the following wave. The chemical element sodium has the atomic number 11 and the letter Na, which derives from the Latin natrium. It is a malleable, silvery-white, and extremely reactive metal. In group 1 of the periodic table, sodium is an alkali metal.

a change from 4p to 4s

As l = 1 for a 4p state and I = 0 for a 4s state, this transition is permitted because l = 1 - 0 = 1

4p (Ei) = 3.75 eV energy

Energy of 4s (E2) = 3.19 eV,

with = 1240 eV nm / (E2 - E1) = 2214 nm 2.214 m.

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The complete question is-

Is a 4p S 4s transition allowed in sodium? If so, what is its wavelength? If not, why not?

Answer:

Gold

.........

..........

Answer:

Gold

Explanation:

Gold is the known most malleable metal, as it is especially soft and can be stretched so much that it becomes transparent.
That is due to his unique composition, which makes its atoms very tightly packed together but at the same time they have the ability to “slide” past one another.

Answer:

yes

Explanation:

The speed of the particles rises with the temperature of the solid, liquid, or gas. The particles slow down with decreasing temperature.

A liquid can turn into a solid if it is cooled down far enough.

The average kinetic energy of the molecules falls as a liquid cools.

The liquid eventually turns into a solid when the quantity of heat removed is sufficient to cause the molecules to be attracted to one another.

Freezing is the process of transitioning from a liquid to a solid.

It loses thermal energy when the liquid cools. Its constituent particles therefore decelerate down and converge.

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Lysine can undergo decarboxylation to produce the end-product cadaverine.

Decarboxylation is a chemical reaction where a carboxyl group (-COOH) is removed from a molecule, resulting in the release of carbon dioxide (CO2). In the case of lysine, the decarboxylation reaction occurs at the carboxyl group (COOH) of the amino acid. The reaction can be catalyzed by enzymes known as decarboxylases. The chemical equation for the decarboxylation of lysine to cadaverine can be represented as follows:

H2N(CH2)4COOH (Lysine) → H2N(CH2)5NH2 (Cadaverine) + CO2

In this reaction, the carboxyl group (COOH) in lysine is removed, resulting in the formation of cadaverine, which has one less carbon atom and one less oxygen atom than lysine. It's important to note that decarboxylation reactions often require specific reaction conditions such as appropriate pH, temperature, and the presence of specific enzymes. Without these conditions, decarboxylation may not occur or proceed at a significant rate.

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Answer:

5.27

Explanation:

Answer:

a) The heat which we supply to water during boiling is used to overcome these forces of attraction between the particles so that they become totally free and change into a gas. This latent heat does not increase the kinetic energy of water particles and hence no rise in temperature takes place during the boiling of water.

b) Steam produces more severe burns than boiling water even though both are at 100oC because steam contains more heat, in the form of latent heat, than boiling water.

Explanation:

i hope this will help u

Carbon Dioxide: CO2

Formula: C + O2

15.0 moles of CO2 contains (15.0 moles CO2) x (1 mole C / 1 mole CO2) = 15.0 moles of C

Carbon Dioxide: CO2

Formula: C + O2

15.0 moles of CO2 contains (15.0 moles CO2) x (2 moles O / 1 mole CO2) = 30.0 moles of O

Calcium Chloride: CaCl2

Formula: Ca + 2Cl

23.0 moles of CaCl2 contains (23.0 moles CaCl2) x (1 mole Cl / 2 moles Cl) = 11.5 moles of Cl

Sulfur Dioxide: SO2

Formula: S + O2

295.0 grams of SO2 contains (295.0 grams SO2) x (1 mole S / 64.066 grams) = 4.6 moles of S

Potassium Sulfate: K2SO4

Formula: 2K + S + 4O

295.0 grams of K2SO4 contains (295.0 grams K2SO4) x (1 mole S / 174.259 grams) = 1.69 moles of S

Iron: Fe

Formula: Fe

565.0 grams of Fe contains (565.0 grams Fe) x (1 mole Fe / 55.845 grams) = 10.15 moles of Fe

metallic elements

SO2 is a covalent compound. It consists of one sulfur atom and two oxygen atoms joined together by covalent bonds, which are strong chemical bonds where electrons are shared between atoms.

H

|

O-H

A water molecule is polar because the electrons are not shared equally between the oxygen and hydrogen atoms. Oxygen is more electronegative than hydrogen, so it pulls the electrons closer to itself, creating a partial negative charge on the oxygen side of the molecule and a partial positive charge on the hydrogen side. This causes the molecule to have a dipole moment and makes the molecule polar.

NH3 (Ammonia) - the molecule is a pyramidal shape, which means that the Nitrogen is at the center and the three hydrogen atoms are located at the three corners of a pyramid.

H2O (Water) - the molecule is a V-shape, this shape is determined by the angle between the two bonding pairs and the two non-bonding pairs of electrons.

CH4 (Methane) - the molecule is tetrahedral shape, the carbon is in the center, and the four hydrogen atoms surround the carbon in a tetrahedral arrangement.

A color change

The formation of a precipitate

The evolution of a gas

A change in temperature

Uday Tahlan

Answer:

It is a metal

Explanation:

The given statement about the third law of thermodynamics in “the entropy of the universe is constant” is correct, because The third law of thermodynamics states that the entropy of a system approaches a constant value as the temperature approaches absolute zero.

Regarding the characteristics of closed systems that have reached thermodynamic equilibrium, the third law of thermodynamics states as follows: A system's entropy approaches a constant value as its temperature approaches absolute zero. This fixed value must be independent of external influences like as pressure or magnetic field strength that may be present within the closed system. The system must be in a minimum-energy condition at 0 kelvins (absolute zero). The entropy of a system is proportional to the number of its microstates; in most cases, there is only one such state (known as the ground state) that has a net negative energy.

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Answer:

activasion energy

Explanation:

Answer:

26.4960 is the answer for the first one

8.9569 is the answer for the second one

The solution is the mass of C8H18 is 69 grams and the mass of C7H8 is 92 grams.

Given: The hydrocarbon mixture contains two hydrocarbons - C8H18 and C7H8.Mass of the mixture = 161 g.Mixtures of two hydrocarbons, C8H18 (octane) and C7H8 (toluene), are burned in excess oxygen to form a mixture of carbon dioxide and water that contains 1.52 times as many moles of carbon dioxide as water. We need to calculate the masses of C8H18 and C7H8 in the mixture.

To calculate the mass of the mixture:Let the mass of C8H18 in the mixture = x gramsTherefore, the mass of C7H8 in the mixture = (161 - x) grams.Then, calculate the number of moles of CO2 and H2O produced.

Using stoichiometry,2 C8H18 + 25 O2 ⟶ 16 CO2 + 18 H2O(2 × moles of C8H18) + (25 × moles of O2) ⟶ (16 × moles of CO2) + (18 × moles of H2O)As per the given condition,Number of moles of CO2 = 1.52 × number of moles of H2OMass of CO2 = Moles of CO2 × Molar mass of CO2 = 1.52 × Moles of H2O × Molar mass of CO2 = 1.52 × (18 × 2 × Moles of C8H18) × 44/22 = 132 × Moles of C8H18Mass of H2O = Moles of H2O × Molar mass of H2O = (18 × 2 × Moles of C8H18) × 18/1000 = 0.648 × Moles of C8H18Therefore, we have the following equation:Mass of C8H18 + Mass of C7H8 = 161 grams => x + (161 - x) = 161 grams=> x = 69 grams => Mass of C8H18 = 69 g.Mass of C7H8 = (161 - 69) g = 92 g.

Thus, the masses of C8H18 and C7H8 in the mixture are 69 g and 92 g, respectively. Hence, the solution is the mass of C8H18 is 69 grams and the mass of C7H8 is 92 grams.

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