true or false when solving for x in a ka or kb expression the change in concentration x or x can only be ignored if the error is less than 5 of the concentration of acid or base

The direction in which the reaction will initially proceed depends on the value of the equilibrium constant (K). If you know K, compare it with the calculated reaction quotient (Q = 20) to determine the direction of the reaction.

To determine the direction in which the reaction will proceed, we need to compare the initial reaction quotient (Q) with the equilibrium constant (K).

Step 1: Calculate the initial concentrations of the reactants and products
Since all substances are mixed in a one-liter container, their concentrations are as follows:
[A] = 0.0010 mol/L
[B] = 5.0 mol/L
[C] = 0.10 mol/L

Step 2: Determine the reaction quotient (Q) using the given concentrations
The reaction quotient is calculated using the formula Q = [C]/([A]*[B]). Plug in the concentrations from step 1:
Q = (0.10) / (0.0010 * 5.0) = 0.10 / 0.005 = 20

Step 3: Compare Q with the equilibrium constant (K)
Without the specific equilibrium constant (K) for the reaction, we cannot provide a definitive answer. However, based on the value of Q, we can infer the following:

- If Q < K, the reaction will proceed forward (to the right) to reach equilibrium.
- If Q > K, the reaction will proceed backward (to the left) to reach equilibrium.
- If Q = K, the reaction is already at equilibrium.

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The vapor pressure of water at the given temperature is approximately 3.2 kPa.

What is Vapor pressure?

Vapor pressure is the pressure exerted by a vapor in equilibrium with its liquid or solid phase at a given temperature in a closed system. It is a measure of the tendency of a substance to evaporate and depends on the temperature and the intermolecular forces present in the substance.

The vapor pressure of water at 80°C is given as 47.37 kPa. We can use the Clausius-Clapeyron equation to calculate the vapor pressure of water at a different temperature:

ln(P2/P1) = (ΔHvap/R) × (1/T1 - 1/T2)

where P1 and T1 are the vapor pressure and temperature at one point, P2 and T2 are the vapor pressure and temperature at another point, ΔHvap is the enthalpy of vaporization, and R is the gas constant.

Assuming that ΔHvap is constant over the temperature range of interest, we can rearrange the equation as follows:

P2 = P1 × exp[(ΔHvap/R) × (1/T1 - 1/T2)]

We can use the known vapor pressure at 80°C and the given temperature to calculate the vapor pressure at the given temperature:

P1 = 47.37 kPa

T1 = 80°C = 353 K

T2 = given temperature = 25°C = 298 K

R = 8.31 J/mol·K (gas constant for SI units)

The enthalpy of vaporization of water is approximately 40.7 kJ/mol.

Plugging in these values gives:

P2 = 47.37 kPa × exp[(40.7 × 10^3 J/mol / (8.31 J/mol·K)) × (1/353 K - 1/298 K)]

P2 ≈ 3.17 kPa

Rounding this to the correct number of significant digits gives:

P2 ≈ 3.2 kPa

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The ph of the given solution is 10.21.

The chemical reaction involved is C₂H₅NH₂ + HCL ==> C₂H₅NH₃⁺ + CL⁻

Given,

initial moles ethylamine = 0.02000 L × 0.1000 mol/L = 0.002000 moles

Moles HCL added = 0.016 L × 0.1000 mol/L = 0.0016 moles

Final moles ethylamine = 0.002000 - 0.0016 = 0.0004 moles

Final moles C₂H₅NH₃⁺ = 0.0016 moles

Final volume = 20ml+ 16.44ml = 36.44ml = 0.03644 L

Final [ C₂H₅NH₃⁺] = 0.0016 mol/ 0.03644 L = 0.04390 M

Final [C₂H₅NH₂] = 0.0004/0.03644 = 0.0109 M

pOH = pKb +㏒ [ C₂H₅NH₃⁺]/[C₂H₅NH₂]

= 3.187 + ㏒ (0.04390/0.0109)

pOH = 3.187 + 0.60503 = 3.7920

pH = 14 - pOH = 14 - 3.793 = 10.21

The ph of the given solution is 10.21.

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If 1.4555 g of phenyl bromide are involved in the grignard reaction, 9.271 millimoles of phenyl bromide are present

The balanced equation for the Grignard reaction between phenyl bromide and carbon dioxide is:

C₆H₅Br + Mg + CO₂ → C₆H₅COOMgBr

In a chemical reaction, the reactant that is completely consumed in the reaction and limits the amount of product that can be formed is called limiting reagent. To determine the limiting reagent in the reaction, we need to calculate the number of moles of each reactant and compare them to the stoichiometric coefficients in the balanced equation.

The molar mass of phenyl bromide is 157.01 g/mol

And the mass used is 1.4555 g

So, the number of moles of phenyl bromide is:

=1.4555 g / 157.01 g/mol

= 0.009271 mol

=9.271 millimole

Thus, 9.271 millimole of phenyl bromide present in the reaction.

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For a first-order reaction, the rate of the reaction is proportional to the concentration of the reactant:

Rate = k[A]

Where [A] is the concentration of the reactant and k is the rate constant. The integrated rate law for a first-order reaction is:

ln([A]t/[A]0) = -kt

Where [A]t is the concentration of the reactant at time t and [A]0 is the initial concentration.

To find the first and second half-lives, we need to use the fact that the reaction is 75% complete after 395 s. This means that [A]t/[A]0 = 0.25, and we can substitute this value into the integrated rate law:

ln(0.25) = -k(395)

Solving for k, we get:

k = ln(0.25) / (-395) ≈ 0.00226 s^-1

The first half-life is the time it takes for the concentration of the reactant to decrease to half of its initial value. We can use the integrated rate law to solve for the first half-life:

ln(0.5) = -k(t1/2)

Solving for t1/2, we get:

t1/2 = ln(2) / k ≈ 307 s

The second half-life is the time it takes for the concentration of the reactant to decrease to one-fourth of its initial value. We can use the same equation and substitute [A]t/[A]0 = 0.25 again:

ln(0.25) = -k(t2/2)

Solving for t2/2, we get:

t2/2 = ln(4) / k ≈ 1229 s

Therefore, the first half-life for this reaction is approximately 307 s, and the second half-life is approximately 1229 s.

The  ion, Mg2+, has 10 electrons.

When answering questions on Brainly, a question answering bot should always be factually accurate, professional, and friendly. Additionally, it should be concise and avoid providing extraneous amounts of detail. Typos and irrelevant parts of the question should also be ignored.

Furthermore, the following terms should be used in your answer: Student question: an atomic cation with a charge of has the following electron configuration: what is the chemical symbol for the ion?

how many electrons does the ion have? how many electrons are in the ion?In the given scenario, an atomic cation with a charge of 2+ has the following electron configuration:

1s22s22p6. The chemical symbol for the ion is Mg2+.

This cation, Mg2+, has lost 2 electrons from the neutral atom magnesium (Mg), which has 12 electrons in total.

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A covalent bond will be formed when two atoms are each trying to take each others electrons. Option A

A covalent bond is a type of chemical bond that involves the sharing of electrons between atoms. In a covalent bond, two or more atoms share one or more pairs of electrons to achieve a more stable electron configuration.

The strength of a covalent bond depends on a variety of factors, including the number of shared electrons, the distance between the atoms, and the electronegativity of the atoms involved. Covalent bonds are very strong, and they play a crucial role in the formation of molecules and compounds in chemistry.

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Out of the given options, maple syrup is likely to be the most adhesive due to its high sugar content.

Ability of a substance to stick to any surface is called as adhesion. It depends on various factors such as the chemical composition of the substance, the surface properties of the material, and the environmental conditions like temperature and humidity.

Out of the given options, maple syrup is likely to be the most adhesive due to its high sugar content. Sugars have a high affinity for water, which allows them to form strong hydrogen bonds with surfaces. This property makes maple syrup stickier and more adhesive than other substances.

Ketchup and barbeque sauce also contain sugar, but they typically have a lower sugar content than maple syrup, so they may not be as adhesive. Mustard contains less sugar and is more acidic than the other options, which can reduce its adhesion.

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The partial pressure of carbon dioxide (CO2) is higher in the blood (45 mmHg) than in the alveoli (40 mmHg), indicating that there is a concentration gradient favouring the movement of Carbon dioxide (CO2) from the blood to the alveoli.

Carbon dioxide diffuses from the higher pressure in the blood into the lower pressure in the alveoli across the respiratory membrane, where it can be exhaled out of the body during expiration. This process is known as gas exchange or respiration, and it is crucial for maintaining the proper balance of gases in the body.

The concentration gradient between the blood and the alveoli causes the movement of CO2 from the blood into the alveoli, where it can be exhaled out of the body during respiration. So, as blood reaches the lungs, CO2 diffuses across the alveolar-capillary membrane into the alveoli, where it mixes with air and is exhaled out of the body during respiration.

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The amount of mercury at 200.0 ppb is 0.478 tons of mercury.

The amount of mercury at 50.0 ppb is 0.1195 tons of mercury.

The question states that mercury is present in trace amounts in coal, ranging from 50.0 to 200.0 ppb.

A typical power plant burns 2.39 million tons of coal per year.To calculate the amount of mercury at 50.0 ppb, we first need to convert ppb (parts per billion) to tons. We can do this by multiplying the concentration by the total amount of coal burned:50.0 ppb x 2.39 million tons = 0.1195 tons of mercury.

Therefore, the amount of mercury at 50.0 ppb is 0.1195 tons of mercury.To calculate the amount of mercury at 200.0 ppb, we can use the same formula:

200.0 ppb x 2.39 million tons = 0.478 tons of mercury.

Therefore, Overall, to calculate the amount of mercury in coal based on different concentrations, we can use the formula concentration x total amount of coal burned.

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The strength and cohesion of clay rich regolith or soil change with the addition of water as the water reduces the strength of clays. So, option (b) is correct.

Clay is defined as a type of fine grained natural soil material which contains clay minerals. It is the oldest known ceramic material. It comes from the ground that usually in areas where streams or rivers are once flowed. Clay is made from minerals, plant life, and animals like all the ingredients of soil. When we add water in the clay it's pressure breaks up the remains of flora, fauna, and minerals, pulverizing them into fine particles. This is the smallest of the three soil particle sizes, sand, silt and clay. These particles are less than 0.002 millimeters in diameter, feels sticky when wet, and can be formed into a ball.

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The correct question is,

How do the strength and cohesion of clay-rich regolith or soil change with the addition of water?

group of answer choices

A. water lowers the strength and cohesion.

B. water reduces the strength of clays but raises the cohesion of the soil.

C. water increases the strength and cohesion.

D. water does not affect the cohesion but lowers the strength.

Answer:

8.0 moles

Explanation:

According to the balanced chemical equation, 1 mole of P4O10 reacts with 6 moles of H2O to produce 4 moles of H3PO4. So if 2.0 moles of P4O10 react completely, it will produce 2.0 * 4 = 8.0 moles of H3PO4.

8 moles of H₃PO₄ are formed from2.0 moles of P₄0₁₀.

The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.

A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.

Given,

Moles of P₄O₁₀ = 2mol

Moles of H₂O = 8 mol

From the reaction,

1 mol of P₄O₁₀ forms 4 moles of H₃PO₄

Thus, 2 moles of P₄O₁₀ will form 4 × 2 moles

= 8 moles of H₃PO₄

Therefore, 8 moles of H₃PO₄ are formed from2.0 moles of P₄0₁₀.

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The gas inside the balloon exerts extra pressure on its walls as a result of the increased molecular mobility, which causes the balloon to expand.

Pressure: As the temperature of the gas inside the balloon increases, the pressure of the gas also increases.

This is because the gas molecules gain kinetic energy with the increase in temperature, resulting in more frequent and forceful collisions with the walls of the balloon. This leads to an increase in pressure inside the balloon, causing it to expand.

Volume: Due to the increase in pressure inside the balloon, the volume of the gas inside the balloon also increases. The balloon expands and stretches to accommodate the increased volume of the gas.

Temperature: The temperature of the gas inside the balloon also increases as it absorbs heat from the hot water.

However, the rate of increase in temperature may be slower compared to the water temperature due to the heat capacity of the balloon material and the heat transfer rate.

Therefore, This increased molecular motion causes the gas inside the balloon to exert more pressure on the walls of the balloon, resulting in the expansion of the balloon.

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Sick Building Syndrome (SBS) is the phenomenon associated with the buildup of toxic compounds and pollutants in an airtight space.

SBS occurs when occupants of a building experience acute health effects and discomfort due to poor indoor air quality. These symptoms often include headaches, dizziness, fatigue, and irritation of the eyes, nose, and throat. The exact cause of SBS is not always clear, but it is typically linked to a combination of factors such as inadequate ventilation, chemical contaminants from indoor sources, and biological contaminants like mold and bacteria.

In many cases, the symptoms of Sick Building Syndrome are alleviated when individuals leave the affected building, indicating that the issue is related to the indoor environment. To address SBS, building managers can take measures to improve air quality by increasing ventilation, using air filtration systems, and conducting regular maintenance to reduce the presence of contaminants.

It is essential to address Sick Building Syndrome to ensure the well-being and productivity of the building's occupants. Prolonged exposure to poor indoor air quality can lead to chronic health issues and reduced work efficiency. By identifying and mitigating the factors contributing to SBS, building managers can create a healthier and more comfortable indoor environment for everyone.

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The characteristics of carbon are:

Carbon has the ability to form strong covalent bonds with other carbon atoms and with other elements such as hydrogen, oxygen, nitrogen, and sulfur. Carbon can form a vast number of compounds due to its ability to bond with other atoms in different configurations, resulting in a diverse range of molecules such as carbohydrates, lipids, proteins, and nucleic acids. Most carbon compounds are covalent and do not dissociate into ions in solution, making them generally nonelectrolytes.

Carbon compounds generally have low melting points due to weak intermolecular forces between molecules. Carbon compounds often have a high reaction rate due to the strong covalent bonds between atoms and the ability of carbon to participate in multiple reactions. Water solubility is not a universal characteristic of carbon compounds, as some are hydrophobic and insoluble in water, while others are hydrophilic and can dissolve in water due to the presence of polar functional groups. Options 1, 3,4,5 and 6 are correct.

The complete question is

Which are characteristics of carbon?

Check all that apply.

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The mass of 1.75 x 10²³ atoms of Pb is approximately 60.1 grams. This will took place in a amount of 11 minutes only.

To convert the given number of atoms of Pb to grams, we need to use the molar mass of Pb.

The atomic mass of Pb is 207.2 g/mol (rounded to one decimal place). This means that one mole of Pb atoms weighs 207.2 grams.

To find the mass of 1.75 x 10²³ atoms of Pb, we can use the following steps:

Calculate the number of moles of Pb atoms in 1.75 x 10²³ atoms:

(1.75 x 10²³ atoms) / (6.022 x 10²³ atoms/mol) = 0.290 moles

Convert moles to grams using the molar mass of Pb:

0.290 moles x 207.2 g/mol = 60.1 grams

Therefore, 1.75 x 10²³ atoms of Pb is equivalent to 60.1 grams.

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Question - What is the mass, in grams, of 1.75 x 10^23 atoms of lead (Pb), in due of 11 minutes?

These factors do not increase the solubility of a gas in a liquid, decreased volume of the gas, with pressure and temperature held constant and decreased partial pressure of the gas. Option a and d are correct choices.

Increased partial pressure of the gas: According to Henry's Law, the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid. Therefore, increasing the partial pressure of the gas will increase its solubility in the liquid.

Decreased temperature: As temperature decreases, the solubility of gases in liquids increases. This is because gases are more soluble in colder liquids than in warmer liquids. Therefore, decreasing the temperature will increase the solubility of the gas in the liquid.

Decreased partial pressure of the gas: As mentioned before, the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid. Therefore, decreasing the partial pressure of the gas will decrease its solubility in the liquid.

Decreased volume of the gas, with pressure and temperature held constant: According to Boyle's Law, the volume of a gas is inversely proportional to its pressure, when temperature is held constant. Therefore, decreasing the volume of the gas while keeping pressure and temperature constant will increase the pressure of the gas. This increase in pressure will tend to decrease the solubility of the gas in the liquid. Hence option a and d are correct.

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In a neutralization reaction, water is always formed. This is because a neutralization reaction involves the reaction of an acid and a base to form a salt and water.

The acid donates a hydrogen ion (H+) and the base donates a hydroxide ion (OH-) to form water (H+ + OH- -> H2O) and the remaining ions combine to form a salt. The salt formed depends on the specific acid and base used in the reaction. Therefore, the correct answer is: water.

Water is a transparent, colorless, odorless, and tasteless liquid that is essential for most forms of life. It is a chemical compound with the formula H2O, meaning it is made up of two hydrogen atoms and one oxygen atom, held together by covalent bonds.

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Answer:  Kinetic energy is the energy of an object due to its motion. To calculate the kinetic energy of a baseball when it hits a window, you need to know the mass and velocity of the baseball, as well as the distance it traveled. You can then use Newton's Second Law of Motion (F = m x a) to calculate the acceleration, and then use the equation KE = 0.5 x m x v^2 to find its kinetic energy.

Explanation:

Significant figures are important in scientific measurements because they indicate the precision and accuracy of the measurement, and ensure that calculations and conclusions based on those measurements are valid and reliable.

Significant figures are important in scientific measurements because they indicate the precision or accuracy of a measurement. The number of significant figures in a measurement represents the number of digits that are known with certainty plus one estimated digit.

It is important to use the correct number of significant figures when reporting measurements to ensure that the data is reliable and consistent. Using too few or too many significant figures can lead to incorrect calculations or conclusions. Therefore, scientists must be careful to use the appropriate number of significant figures when measuring and reporting data.

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--The complete question is, What is the importance of significant figures in scientific measurements?--

We need approximately 78.5 mL of the 19.1 M NaOH concentrate to prepare 1.00 L of a 1.50 M NaOH solution.

To determine the amount of concentrated NaOH solution needed to prepare 1.00 L of a 1.50 M solution, you can use the dilution formula:

M1 × V1 = M2 × V2

Where M1 and V1 are the molarity and volume of the concentrated solution, and M2 and V2 are the molarity and volume of the diluted solution.

In this student question, we are given the following information:

M1 = 19.1 M (concentration of the concentrated NaOH solution)
M2 = 1.50 M (desired concentration of the diluted NaOH solution)
V2 = 1.00 L (desired volume of the diluted NaOH solution)

We need to find V1 (volume of the concentrated solution needed for dilution). To do this, rearrange the formula:

V1 = (M2 × V2) / M1

Now plug in the given values:

V1 = (1.50 M × 1.00 L) / 19.1 M

V1 ≈ 0.0785 L

Since the question asks for the volume in mili litres, we need to convert litres to mili litres:

0.0785 L × 1000 mL/L ≈ 78.5 mL

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Neither of the statements is correct concerning the acid ionization constant, Ka, of iodous acid, HIO₂.

When more HIO₂ is dissolved into water, the pH of the solution will change. This is because HIO₂ is a weak acid and will undergo dissociation in water to produce H⁺ ions and IO₂⁻ ions. The concentration of H⁺ ions will affect the pH of the solution.

Similarly, the value of Ka will also change if more HIO₂ is dissolved into water. Ka is the equilibrium constant for the dissociation of HIO₂ in water. If more HIO₂ is dissolved into water, the equilibrium will shift to the right, resulting in an increase in the concentration of H⁺ ions and IO₂⁻ ions.

This will result in an increase in the value of Ka, as Ka is directly proportional to the concentration of H⁺ ions produced by the dissociation of the weak acid.

Therefore, if more HIO₂ is dissolved into water, both the pH of the solution and the value of Ka will change.

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--The given question is incomplete, the complete question is

"Which of the following is correct concerning the acid ionization constant, ka, of iodous acid, HIO₂? group of answer choices A) if more HIO₂ is dissolved into water, B) the ph of the solution will remain the same. C) if more HIO₂ is dissolved into water, then ka will increase."--

Using the relationship between number of moles, concentration and volume, the amount of sal^2-(aq) transferred to the 10 ml volumetric flask is 6.0 × 10^-6 mol.

Since 0.5 ml of the stock solution was transferred to a 10 ml volumetric flask, the volume of the transferred solution is:

0.5 ml = 0.5 × 10^-3 L = 5.0 × 10^-4 L

To determine the amount of sal^2-(aq) transferred to the 10 ml volumetric flask, we can use the formula:

amount (in moles) = concentration × volume

where concentration is in moles per liter (mol/L) and volume is in liters (L).

The concentration of the stock solution is:

concentration = 1.20 × 10^-3 mol / 0.1 L = 1.20 × 10^-2 mol/L

Using this concentration and the volume of the transferred solution, we can calculate the amount of sal^2-(aq) transferred to the 10 ml volumetric flask:

amount (in moles) = concentration × volume

= 1.20 × 10^-2 mol/L × 5.0 × 10^-4 L

= 6.0 × 10^-6 mol

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The dominant species in solution at the equivalence point of a weak base-strong acid titration is neutral salt. The correct answer is option 5.

A salt is a compound formed from the combination of an acid and a base. The acid and base neutralize each other, resulting in the formation of a neutral salt. The salt's pH will be determined by the strength of the acid and base that made it.A neutral salt is formed when the acid and base are strong or when they are of equal strength.

If the acid is strong and the base is weak, the salt will be acidic, and if the base is strong and the acid is weak, the salt will be basic. At the equivalence point of a weak base-strong acid titration, the dominant species in solution is a neutral salt.

At the endpoint, the pH of the solution will be less than 7 because the acid has been added to the solution. However, at the equivalence point, the acid and base have completely reacted to form a neutral salt, which is neither acidic nor basic. The correct answer is option 5.

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The amount naoh in ml required to reach the half-equivalence point for this titration is calculated to be 7.08 ml.

The half-equivalence point of a titration is reached when half of the acid has reacted with the base. At this point, the moles of acid and base are equal, and we can use this information to calculate the volume of base needed to reach the half-equivalence point.

First, we can calculate the number of moles of acetic acid present in the solution:

moles of CH3COOH = concentration x volume

moles of CH3COOH = 0.150 mol/L x 0.0236 L

moles of CH3COOH = 0.00354 mol

At the half-equivalence point, half of the acetic acid will have reacted, so the number of moles of acetic acid remaining will be:

moles of CH3COOH remaining = 0.00354 mol / 2

moles of CH3COOH remaining = 0.00177 mol

Since the reaction between acetic acid and sodium hydroxide is 1:1, we will need an equal number of moles of sodium hydroxide to react with the remaining acetic acid:

moles of NaOH needed = 0.00177 mol

Finally, we can use the concentration of sodium hydroxide to calculate the volume needed to provide this many moles:

volume of NaOH = moles of NaOH / concentration of NaOH

volume of NaOH = 0.00177 mol / 0.25 mol/L

volume of NaOH = 0.00708 L

volume of NaOH = 7.08 mL

Therefore, the volume of NaOH needed to reach the half-equivalence point is 7.08 mL.

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The mass of an Avogadro's number of carbon atoms is approximately 12.01 grams, rounded to two decimal places.

An Avogadro's number of any substance contains 6.022 x [tex]10^{23}[/tex] particles (atoms, molecules, or ions). In this case, you have an Avogadro's number of carbon atoms. To find the mass in grams, you need to know the molar mass of carbon.

Carbon has a molar mass of 12.01 grams per mole (g/mol). Since you have one mole of carbon atoms (as defined by Avogadro's number), the mass of these carbon atoms would be:

Mass = (1 mole) x (12.01 g/mol) = 12.01 grams.

Therefore, the mass of an Avogadro's number of carbon atoms is approximately 12.01 grams, rounded to two decimal places.

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Among all the substances used, water possesses the strongest intermolecular forces (hydrogen bonds).

Although hydrogen bonds exist in glycerine and methylated spirits as well, they are a little weaker than in water. Due to its nonpolar nature and minimal London dispersion forces, CH4 (methane) would exhibit the smallest intermolecular forces of attraction.

In particular, a subgroup of dipole-dipole interactions known as hydrogen bonding, which takes place when a hydrogen is in close proximity to (attached to) a very electronegative element, is the strongest intermolecular force (namely oxygen, nitrogen, or fluorine).

The relative strength of a material's intermolecular links can be determined by measuring its melting and boiling temperatures; the stronger the intermolecular bonds, the higher the melting temperature of the substance.

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Answer: In many ways, leaves have been planning all year for the coming winter by putting away energy and sugars to tide them over the coming winter. With temperatures falling in harvest time, generation of chlorophyll stops and the levels of this chemical inside clears out diminishes.

Explanation:

Answer above

:)

Answer:

reflects

Explanation:

White objects appear white because they reflect all colours to create white. Black objects absorb all colours so no light is reflected.