In a mixture of the nitric acid and sulfuric acid, ____ will act as the "base" and will be ____

The amount of energy used to heat 20 g of zinc from 45°C to 65°C is 176 J.

The amount of energy used to heat a substance is determined by its specific heat capacity, mass, and the change in temperature. In this case, we are given the mass of zinc (20 g), the specific heat capacity of zinc (0.440 J/g °C), and the change in temperature (20°C).

To calculate the amount of energy used to heat the zinc, we can use the formula:

Energy = mass x specific heat capacity x change in temperature

Plugging in the given values, we get:

Energy = 20 g x 0.440 J/g °C x 20°C = 176 J

This calculation is useful in understanding the amount of energy required to change the temperature of a substance and can be applied to other materials with known specific heat capacities.

Learn more about energy here:

https://brainly.com/question/1932868

#SPJ4

The hydronium ion concentration, [H₃O⁺] =5.3 x 10⁻⁷ M, which is calculated in the below section.

The value of Kw = 2.8 x 10⁻¹³

In the autoionization of water, a proton is transferred from one water molecule to another to produce a hydronium ion (H₃O⁺) and a hydroxide ion (OH⁻). The equilibrium expression for this reaction is Kw = [H₃O⁺][OH⁻],

The concentration of hydronium ion and hydroxyl ion when a water molecule dissociates is the same which is 1 mol.

Kw = [H₃O] [OH⁻]

2.8 x 10⁻¹³ = [H₃O⁺]²

[H₃O⁺] = √(2.8 x 10⁻¹³)

[H₃O⁺] =5.3 x 10⁻⁷ M

To learn more about hydronium ion check the link below-

https://brainly.com/question/27586088

#SPJ4

Heating mantles are commonly used in chemical laboratories for heating solutions in round-bottom flasks. Although they are useful in many ways, they also have some drawbacks.

One of the main disadvantages of heating mantles is that they can be a safety hazard if they are not used properly. Heating mantles can easily overheat and cause the flask to crack or even explode, which can cause injury to the operator and damage to the equipment. Another drawback of using heating mantles is that they are not suitable for heating all types of solutions. For example, heating mantles are not recommended for heating volatile or flammable solutions as they can cause fires or explosions. Additionally, heating mantles can be expensive to purchase and maintain. They require regular cleaning and calibration to ensure that they are working correctly, and this can be time-consuming and costly. Finally, heating mantles can be energy-intensive and consume a lot of electricity, which can add up to high utility bills. In summary, while heating mantles are useful for heating solutions, they have some drawbacks that should be taken into account when using them in the laboratory.

learn more about heating here

https://brainly.com/question/30407538

#SPJ11

Answer: We add small amount of chlorine to water to kill bacteria that cause infection.

Explanation: Adding chlorine to water is called chlorination. It is done to remove unwanted materials like pathogens viruses, and bacteria. the effectiveness of chlorine added depends upon the water temperature, water pH, turbidity, etc.

chlorine is available in two formulations, as a dry powder or pellet. chlorination is more effective at a high temperature and a low pH.

1- An aldehyde will form a silver mirror When Tollens' reagent is added to solutions of an aldehyde and a ketone, 2- Benedict's reagent is a test used to detect the presence of reducing sugars in a solution.

Reagent is a substance used in a chemical reaction to detect, measure, examine, or produce other substances. It is a material that is used to cause a chemical reaction, or to test for the presence of a substance. Reagents are used in a variety of scientific and industrial processes to measure, detect, and produce chemical compounds.

1- aldehyde is used because aldehydes can be oxidized by Tollens' reagent to form carboxylic acids, while ketones cannot be oxidized further. The silver ions in Tollens' reagent are reduced by the aldehydes to metallic silver, which forms a mirror on the walls of the reaction vessel.

2- Benedict's reagent contains copper(II) ions which are reduced to copper(I) ions when a reducing sugar is present. The reducing sugar acts as a reducing agent, donating electrons to the copper(II) ions and reducing them to copper(I) ions. The copper(I) ions then precipitate out of solution as copper(I) oxide, giving a reddish-brown color.

The results obtained for different molecules with Benedict's reagent are as follows:

- Monosaccharides (such as glucose and fructose): will give a positive test result with Benedict's reagent, producing a reddish-brown color.

- Disaccharides (such as sucrose): will not give a positive test result with Benedict's reagent, as they are not reducing sugars.

To learn more about reagent

https://brainly.com/question/26905271

#SPJ4

The complete question is:

1. Which one aldehyde or ketone solution would produce a silver mirror if tollens reagent was added?

2. What is tested for by Benedict's reagent? Describe the outcomes for the various compounds that Benedict's reagent can distinguish between.

Indicate the delocalization of electron pairs using curved arrows.

1) To draw the other significant resonance contributor for the compound, identify the regions with lone pairs of electrons, double bonds, or formal charges. Look for the movement of these electrons that could form a new, equivalent structure.

2) To show the delocalization of electron pairs, add curved arrows to both structures. The tail of the arrow should start from the electron pair (lone pair or double bond) and the head of the arrow should point towards the new location of that electron pair.

If a lone pair forms a double bond, the arrow will point to the bond location. If a double bond is broken, the arrow will point to the atom that gains a lone pair.

Remember to include hydrogen atoms, lone pairs of electrons, and formal charges in both resonance structures.

To learn more about hydrogen, refer below:

https://brainly.com/question/28937951

#SPJ11

To calculate the pH of 0.020 M (CH3)3NHBr, we need to first determine the pKa value of (CH3)3NH+. This can be found in a table of acid dissociation constants and is equal to 9.75.

Next, we can write out the acid-base equilibrium for (CH3)3NH+:

(CH3)3NH+ + H2O ⇌ (CH3)3NHOH+ + OH-

The Ka value for this equilibrium is given by:

Ka = [ (CH3)3NHOH+ ][OH-] / [ (CH3)3NH+ ]

We can assume that the concentration of (CH3)3NH+ is equal to the initial concentration of (CH3)3NHBr, which is 0.020 M. We can also assume that the concentration of OH- is equal to the concentration of (CH3)3NHOH+, as the reaction is in equilibrium.

Therefore:

Ka = [ (CH3)3NHOH+ ]^2 / 0.020

Solving for [ (CH3)3NHOH+ ], we get:

[ (CH3)3NHOH+ ] = sqrt( Ka x 0.020 ) = sqrt( 1.78 x 10^-11 x 0.020 ) = 1.19 x 10^-6 M

Now, we can use the equation for pH:

pH = pKa + log( [ (CH3)3NH+ ] / [ (CH3)3NHOH+ ] )

Substituting in the values we have found, we get:

pH = 9.75 + log( 0.020 / 1.19 x 10^-6 ) = 11.57

Therefore, the pH of 0.020 M (CH3)3NHBr is 11.57.

Note: This answer assumes that the (CH3)3NHBr is completely dissociated in solution. If this is not the case, the pH calculation would need to take into account the degree of dissociation.

To know more about please visit...

brainly.com/question/30884996

#SPJ11

The two possible starting materials for preparing an azo dye are: aniline and phenol, option B.

There are several azo dye categorization schemes, and there are numerous types of azo dyes. Disperse dyes, metal-complex dyes, reactive dyes, and substantive dyes are a few of the classes. Substantive dyes, often known as direct dyes, are used for cellulose-based fabrics like cotton. Non-electrostatic forces are used to bond the colours to the fabric. Another categorization for azo dyes is based on how many azo groups are present.

Organic substances with the functional group RN=NR′, in which R and R′ are typically aryl and substituted aryl groups, are known as azo dyes. They are a class of economically significant azo compounds, or substances that possess the C-N=N-C connection. Azo dyes are artificial colours that are not found in nature. The majority of azo dyes only have one azo group, however some dyes—referred to as "diazo dyes" and "triazo dyes," respectively—contain two or three azo groups. 60 to 70 percent of the colours used in the food and textile sectors are azo dyes. Azo dyes are frequently used to colour meals, leather goods, and fabrics. Azo pigments are a chemically related derivative of azo dyes that are insoluble in water and other solvents.

Learn more about Azo dye:

https://brainly.com/question/28240406

#SPJ4

Xenon can be the central atom of a molecule by expanding beyond an octet of electrons

Define lectrons.

A negatively charged subatomic particle known as an electron can be free (not bound) or bound to an atom. One of the three main types of particles within an atom is an electron that is bonded to it; the other two are protons and neutrons. The nucleus of an atom is made up of electrons, protons, and neutrons together.

The valence shell electrons in a molecule are depicted in an extremely simplified manner by a Lewis Structure. It is used to demonstrate how the electrons in a molecule are positioned around particular atoms. Electrons are shown as "dots" or, in the case of a bond, as a line connecting the two atoms.

Lewis Structure of XeF2 is linear(in attachment)

To learn more about Lewis Structure use:

https://brainly.com/question/20300458

#SPJ4

In order to draw the Lewis structure of a molecule, you must first determine the total number of available valence electrons by looking up the elements in the periodic table.

A molecule is the smallest unit of a compound that retains the chemical properties of that compound. It is composed of two or more atoms held together by chemical bonds. Molecules can range in size from the smallest, such as hydrogen (H₂), to the largest, such as proteins and DNA. Molecules are the building blocks of matter, which makes up all living things and the environment around us.

In order to draw the Lewis structure of a molecule, you must first determine the total number of available valence electrons by looking up the elements in the periodic table and calculating their total ionic charges. Then, use the total number of electrons needed for each element to be stable, based on the octet rule or VSEPR theory, to determine the steric number and total number of bonds by finding the difference between the number of needed and available electrons divided by two. Next, identify the central atom, which is the element with the greatest electronegativity or fewest valence electrons. Finally, arrange the number of bonds around the central atom to fulfill the stable number of electrons for each element.

To learn more about molecule

https://brainly.com/question/475709

#SPJ4

Complete Question:

Explain the steps in how to draw the Lewis structure of the molecule.

Out of the given options, only option I and III have a pH of 2. This is because the pH of a solution is determined by the concentration of hydrogen ions (H+) in the solution. Hydrochloric acid (HCl) is a strong acid and fully dissociates in water to release hydrogen ions. Therefore, the concentration of hydrogen ions in a hydrochloric acid solution is equal to the concentration of the acid.

Option I has a smaller volume of hydrochloric acid solution, but it has a higher concentration of 0.01 mol dm−3. This means that it has a higher concentration of hydrogen ions, leading to a lower pH of 2.

Option III has the same concentration of hydrochloric acid as option I, but it has a larger volume of 500 cm3. This means that it has a lower concentration of hydrogen ions compared to option I, but still enough to have a pH of 2.

Option II has a higher concentration of 0.02 mol dm−3, but it has a much larger volume of 1000 cm3. This leads to a lower concentration of hydrogen ions and a higher pH of around 2.7.

In summary, the concentration and volume of the hydrochloric acid solution are important factors in determining the pH of the solution. Options I and III have the same concentration of 0.01 mol dm−3 but differ in volume, leading to the same pH of 2. Option II has a higher concentration but a larger volume, leading to a higher pH of around 2.7.

To know more Hydrochloric acid (HCl)   click this link-

brainly.in/question/11825459?

#SPJ11

According to the question the concentration of Cu²⁺ is 5.0 x 10-16 M.

Concentration is the ability to focus on a specific task or thought without being easily distracted by other things. It involves paying close attention to details, thinking deeply about the task at hand, and blocking out any extraneous noise or interruptions. Concentration requires practice and requires developing techniques to help maintain focus, such as setting a timer to work on a task, breaking a task into smaller parts, and avoiding multitasking. Concentration is an important skill that can help improve problem-solving skills, productivity, creativity, and mental well-being.

The reaction quotient, qc, is determined using the concentrations of the reactants and products at equilibrium. To calculate the concentration of copper (Cu2+), we need to use the equilibrium expression.
The reaction is:
Ag⁺ + Cu²⁺ → Ag⁺ + Cu²⁺
The equilibrium expression is:
Kc = [Ag⁺][Cu²⁺] / [Ag⁺]²
Rearranging the equation to solve for [Cu²⁺], we get:
[Cu²⁺] = (Kc * [Ag⁺]²) / [Ag⁺]
Plugging in the values, we get:
[Cu²⁺] = (5.0 x 10-16 * (1 M)²) / 1 M
Therefore, the concentration of Cu²⁺ is 5.0 x 10-16 M.

To learn more about concentration
https://brainly.com/question/28564792
#SPJ4

To make a 0.197 m nitric acid solution from a stock solution of 6.00 m nitric acid, you need to dilute the stock solution with water. The amount of concentrated acid needed can be calculated using the formula: C1V1 = C2V2

where C1 is the initial concentration of the stock solution, V1 is the volume of the stock solution needed, C2 is the final concentration of the dilute solution, and V2 is the total volume of the dilute solution.

In this case, we can plug in the values we have:

C1 = 6.00 m
C2 = 0.197 m
V2 = 75.0 ml

Solving for V1, we get:

V1 = (C2V2) / C1
V1 = (0.197 m * 75.0 ml) / 6.00 m
V1 = 2.47 ml

Therefore, you need to add 2.47 ml of concentrated nitric acid to 72.53 ml of water to obtain a total volume of 75.0 ml of the dilute solution.

To make a 0.197 M nitric acid solution with a total volume of 75.0 mL from a 6.00 M stock solution, you can use the dilution equation:

M1V1 = M2V2

Where M1 is the initial molarity (6.00 M), V1 is the volume of concentrated acid needed, M2 is the final molarity (0.197 M), and V2 is the final volume (75.0 mL). To find the volume of concentrated acid needed (V1), rearrange the equation:

V1 = (M2V2) / M1

To know more about stock solution visit:

https://brainly.com/question/25256765

#SPJ11

The option is A) An increase in distance between the proton and a nearby electronegative group.

Proton is a subatomic particle that is one of the components of an atom. It is made up of three quarks and has a positive charge. Protons have a mass of [tex]1.6726 \times 10^{-27[/tex] kg, which is nearly 2,000 times the mass of an electron. Protons are the most abundant particle in the nucleus of an atom, and they are held together by the strong nuclear force.  

The chemical shift of a proton in ^1H NMR is determined by the environment in which the proton is located. Electronegative groups, such as oxygen, nitrogen and chlorine, will cause the proton to experience a higher field and thus resulting in a higher shift. Increasing the distance between the proton and the electronegative group will reduce the field experienced by the proton and thus resulting in a lower shift.

To learn more about proton

https://brainly.com/question/1481324

#SPJ4

Structural isomers are molecules that share the same molecular formula but exhibit distinct variations in the manner in which their atoms are arranged. These differences can involve alterations in bonding patterns, functional groups, or a combination of both.

Stereoisomers, on the other hand, have the same bonding pattern and functional groups, but differ in the spatial orientation of their atoms. This means that stereoisomers have identical chemical formulas and bonding patterns, but they have different three-dimensional shapes.

There are two types of stereoisomers: enantiomers and diastereomers. Enantiomers are mirror images of each other and cannot be superimposed on one another, while diastereomers are stereoisomers that are not mirror images of each other.

Stereoisomers are important in fields such as pharmacology, where the different spatial arrangement of atoms can affect the biological activity and pharmacological properties of a molecule.

To know more about the Structural isomers refer here :

https://brainly.com/question/13422357#

#SPJ11

The organic product in this reaction would be propan-2-one (also known as acetone). This is because the Grignard reagent, which is formed when acetone (CH₃COCH₃) reacts with phenylmagnesium bromide, would be propan-2-ylmagnesium bromide.

Organic products are any food items that are grown without the use of synthetic fertilizers, pesticides, or other artificial substances. This type of food is grown and processed without the use of any artificial chemicals, preservatives, or other unnatural elements. Organic products are typically grown in an environment that is free from chemical inputs and is rich in natural minerals and nutrients. Organic products are typically found to be higher in vitamins and minerals, as well as significantly lower in toxins and other contaminants when compared to non-organic foods. Organic products are also typically produced in ways that are more sustainable and environmentally friendly than conventional farming methods. Organic products are a great way to ensure that you are putting the most nutritious and healthy food in your body.

Upon hydrolysis of the magnesium complex, this would produce propan-2-one (CH₃COCH₃) as the organic product.

To learn more about organic product
https://brainly.com/question/30584521
#SPJ4

The equilibrium concentration of Ag+ in the solution is [tex]5.48 * 10^{-5}[/tex] M for a sample of a solution having a 50mL volume.

Volume of sample = 50 mL

Molarity of [tex]AgNO_{3}[/tex] = 0. 00200 M

Molarity of [tex]NaIO_{3}[/tex]=  0. 0100M

Ksp for [tex]AgIO_{3}[/tex]  =  [tex]3. 0 * 10^{-8}[/tex]

The chemical balanced equation for the reaction between [tex]AgNO_{3}[/tex] and [tex]NaIO_{3}[/tex]:

[tex]AgNO_{3} + NaIO_{3} = AgIO_{3} + NaNO_{3}[/tex]

The Moles of [tex]AgNO_{3}[/tex] = 0.00200 mol/L x 0.0500 L = [tex]1.00 * 10^{-4} mol[/tex]

The Moles of [tex]NaIO_{3}[/tex] = 0.0100 mol/L x 0.0500 L = [tex]5.00 *10^{-4} mol[/tex]

Calculate the concentration of Ag+ ions using the Ksp value for [tex]AgIO_{3}[/tex]:

[tex]AgIO_{3}[/tex] ⇌ (Ag+) +( [tex]I_{O3-}[/tex])

Ksp = [Ag+][[tex]I_{O3-}[/tex]]

Ksp = [tex]x^{2}[/tex]

[tex]3.0 * 10^{-8} = x^2[/tex]

x = [tex]\sqrt{3.0 * 10^{-8}}[/tex]

x = [tex]5.48 * 10^{-5}[/tex] M

Therefore, we can conclude that the equilibrium concentration of Ag+ in the solution is [tex]5.48 * 10^{-5}[/tex] M.

To learn more about Equilibrium concentration

https://brainly.com/question/30368762

#SPJ4

Changing the pressure of a gas is a way of changing the volume of the gas.

The volume of a gas is directly proportional to its pressure, meaning that as pressure increases, the volume of the gas decreases, and vice versa. This relationship is known as Boyle's law. Therefore, if you want to change the volume of a gas, you can do so by changing its pressure.

Changing the pressure of a gas can affect not only its volume but also its temperature and density. When you increase the pressure of a gas, you force its molecules closer together, which decreases the space between them and reduces the volume of the gas. Conversely, when you decrease the pressure of a gas, you allow its molecules to move further apart, which increases the space between them and increases the volume of the gas.

However, changing the pressure of a gas can also affect its temperature. When you compress a gas, you add energy to its molecules, which increases their kinetic energy and raises the temperature of the gas. Conversely, when you expand a gas, you remove energy from its molecules, which decreases their kinetic energy and lowers the temperature of the gas.

To know more about pressure, visit:

https://brainly.com/question/22613963

#SPJ11

Moisture on the column can interfere with the binding of the protein to the stationary phase by disrupting the hydrogen bonding and electrostatic interactions that occur between the protein and the ligands. This can lead to reduced binding efficiency, lower resolution, and decreased overall performance of the column.

What is Moisture?

Moisture is a term used to describe the presence of water or other liquids in a material or environment. In many contexts, moisture refers specifically to the amount of water vapor in the air or in a substance, such as a solid or liquid.

In addition, moisture on the column can also promote non-specific binding of other proteins or impurities in the sample, leading to contamination and reduced purity of the final protein product. Therefore, it is important to ensure that the column is completely dry before loading the protein mix to achieve optimal binding and separation of the protein of interest.

Learn more about Moisture from the given link

https://brainly.com/question/30457844

#SPJ4

When asked to find the pH after initial mols of titrant are added, how do we solve for pH.

First genuinely discover the moles of extra H₃O⁺. The extra may be calculated via way of means of subtracting preliminary moles of analyte B from moles of acidic titrant added, assuming a one-to-one stoichiometric ratio. Once the range of moles of extra H₃O⁺ is determined, [H₃O⁺] may be calculated. In water, a proton is transferred from one water molecule to any other to supply a hydronium ion (H₃O⁺) and a hydroxide ion (OH⁻). The pH of the solution can be calculated as follows-

pH  = -log (H₃O⁺)

To learn more about hydronium ion check the link below-

brainly.com/question/27586088

#SPJ4

The basis of the VSEPR model of molecular bonding is the minimization of repulsion between electron pairs surrounding an atom in a molecule.

VSEPR stands for Valence Shell Electron Pair Repulsion. The VSEPR model is a theory used to predict the geometrical shapes of molecules based on the repulsion between their electron pairs. According to the model, electron pairs in the valence shell of an atom tend to stay as far apart as possible to minimize the repulsion between them. This results in a particular molecular geometry that depends on the number of bonding and non-bonding electron pairs around the central atom.

Step-by-step:
1. Determine the central atom in the molecule.
2. Count the total number of electron pairs (both bonding and non-bonding) surrounding the central atom.
3. Arrange these electron pairs in a way that they are as far apart from each other as possible, to minimize repulsion.
4. The arrangement of electron pairs determines the molecular geometry.

In summary, the VSEPR model of molecular bonding is based on minimizing the repulsion between electron pairs surrounding an atom in a molecule, which helps in predicting the geometrical shapes of molecules.

To know more about Valence Shell Electron Pair Repulsion. visit:

brainly.com/question/31129877

#SPJ11

The partial pressures of O2, CO2, and N2 in the vessel can be calculated using Dalton's Law of Partial Pressures. The partial pressures of O2, CO2, and N2 in the vessel are 67.2 atm, 12.8 atm, and 20.0 atm, respectively.

Dalton's Law of Partial Pressures states that in a mixture of non-reacting gases, the total pressure exerted is equal to the sum of the partial pressures of each individual gas. Each gas behaves independently of the other gases present and exerts its own pressure, known as its partial pressure. The total pressure of the mixture is the sum of the partial pressures of each gas.

First, we need to calculate the mole fractions of each gas:
X(O2) = 0.672/(0.672 + 0.128 + 0.200) = 0.672

X(CO2) = 0.128/(0.672 + 0.128 + 0.200) = 0.128

X(N2) = 0.200/(0.672 + 0.128 + 0.200) = 0.200

Next, we can use the ideal gas law to calculate the partial pressures:
P(O2) = X(O2) * P(total) = 0.672 * 100. atm = 67.2 atm

P(CO2) = X(CO2) * P(total) = 0.128 * 100. atm = 12.8 atm

P(N2) = X(N2) * P(total) = 0.200 * 100. atm = 20.0 atm

Therefore, the partial pressures of O2, CO2, and N2 in the vessel are 67.2 atm, 12.8 atm, and 20.0 atm, respectively.

To learn more about Dalton's Law, click here:
https://brainly.com/question/14119417

#SPJ11

To calculate the equilibrium constant (K) for the given reaction at room temperature (typically taken as 25°C or 298K), we can use the following equation: K(room temp) = K(T) * exp(-ΔH°/RT)

K(T) is the equilibrium constant at temperature T

ΔH° is the standard enthalpy change for the reaction

R is the gas constant (8.314 J/K*mol)

T is the absolute temperature in Kelvin (298K for room temperature).

The exponential term in the equation takes into account the temperature dependence of the equilibrium constant. If ΔH° is positive, the equilibrium constant will decrease with increasing temperature, while if ΔH° is negative, the equilibrium constant will increase with increasing temperature.

Note that the values of ΔH° and K(T) for the given reaction would need to be provided in order to calculate K(room temp) using this equation.

learn more about enthalpy here:

https://brainly.com/question/16720480

#SPJ11

Final temperature of the gold nugget is approximately 388.71 K after losing 4.85 kJ of heat to a snowbank, given its mass of 376 g and specific heat capacity of [tex]0.128 J g^{-1} °C^{-1}[/tex].

What is the final temperature of a gold nugget after losing 4.85 kJ of heat to a snowbank?

We can use the equation:

q = mcΔT

where q is the heat lost, m is the mass of the gold nugget, c is the specific heat capacity of gold, and ΔT is the change in temperature.

First, we need to convert the heat lost from kJ to J:

[tex]4.85 kJ = 4.85 \times 10^3 J[/tex]

Now we can rearrange the equation to solve for the final temperature:

ΔT = q / (mc)

[tex]\Delta T = \frac{4.85 \times 10^3 J}{376 g \times 0.128 J g^{-1} °C^{-1}}[/tex]

ΔT ≈ 9.29 °C (rounded to two decimal places)

To find the final temperature, we just need to subtract ΔT from the initial temperature:

Final Temperature = 398 K - 9.29 °C

Final Temperature ≈ 388.71 K

Therefore, the final temperature of the gold nugget is approximately 388.71 K.

To learn more about specific heat capacity, visit: https://brainly.com/question/27862577

#SPJ4

Answer:

The correct choice is:

Human activities on land.

The passage of key information here suggests that the vast majority of pollutants in the oceans come from human activities that take place on land.

The other choices are not supported:

• Boats - Boats are a means of transporting things on/over the oceans, but they are not themselves the primary source of pollution. Pollution comes from spills, discharges, and accidents involving boats, but boats alone do not introduce the most pollutants.

• Oil tanker spills. - While oil tanker spills can be highly damaging, they are not responsible for introducing the bulk of pollutants into the oceans. There are many other types of pollutants and they come from a wide range of land-based human activities.

• Underground storage facilities. - There is no information in the context provided to support this as a major source of ocean pollution.

So based on the context, the correct choice is "Human activities on land."

Explanation:

The changes that will cause the volume of the gas sample to decrease are: temperature decreases and external pressure increases, and temperature decreases while external pressure remains constant.

To answer this multiple select question, we need to understand the relationship between the volume, temperature, and external pressure of an ideal gas. According to the gas laws, the volume of a gas is directly proportional to the temperature and inversely proportional to the external pressure when the temperature remains constant.
So, in order to decrease the volume of the gas sample, we need to either decrease the temperature or increase the external pressure or both. Therefore, the following changes will cause the volume to decrease:
1. Temperature decreases and external pressure increases: Since the temperature is decreasing, the volume will also decrease if the external pressure increases. This is because the gas molecules will have less kinetic energy and will move slower, causing them to occupy less space. At the same time, an increase in external pressure will squeeze the gas molecules closer together, further reducing the volume.
2. External pressure decreases while temperature remains constant: This option is incorrect because a decrease in external pressure will cause the gas molecules to expand and occupy more space, thereby increasing the volume. When the temperature remains constant, the only way to decrease the volume is to increase the external pressure.
3. Temperature decreases while external pressure remains constant: This option is correct because a decrease in temperature will cause the gas molecules to slow down and occupy less space, thereby decreasing the volume. When the external pressure remains constant, the only way to decrease the volume is to decrease the temperature.
4. Temperature increases and external pressure decreases: This option is incorrect because an increase in temperature will cause the gas molecules to move faster and occupy more space, thereby increasing the volume. When the external pressure decreases, the gas molecules will expand even more, further increasing the volume.

To know more about temperature visit :

https://brainly.com/question/31794720

#SPJ11

This polynomial is in standard form because the powers of x are in descending order and there are no like terms that can be combined.

A fourth-degree polynomial with two terms in standard form can be written as:

[tex]ax^4 + bx^2[/tex]

where "a" and "b" are constants and "x" is the variable raised to powers of 4 and 2.

This polynomial is in standard form because the terms are arranged in descending order of degree and the coefficients of each term are written in front of the corresponding power of x. Additionally, there are no like terms that can be combined further.

To create such a polynomial, we can choose any values for "a" and "b". For example, let's say a = 2 and b = -3. Then, the polynomial can be written as:

[tex]2x^4 - 3x^2[/tex]

This polynomial is in standard form because the powers of x are in descending order and there are no like terms that can be combined.

learn more about polynomial

https://brainly.com/question/11536910

#SPJ4

In hot weather, the testes are protected from the heat by the dartos muscle which contracts and causes the scrotum to wrinkle and become tighter, bringing the testes closer to the body for better heat exchange, and by the cremaster muscle which pulls the testes up towards the body to keep them cooler.

Additionally, sweat glands in the scrotum help to cool the area down through evaporation.

In hot weather, the testes are protected from the heat by the cremaster muscle and the dartos muscle. These muscles work together to regulate the temperature of the testes. The cremaster muscle adjusts the position of the testicles, raising or lowering them to maintain an optimal temperature. The dartos muscle, on the other hand, contracts and relaxes the scrotal skin to increase or decrease surface area, which helps with heat dissipation. In hot weather, both muscles work to lower the testes away from the body and relax the scrotal skin, allowing for greater heat dissipation and keeping the testes at their optimal temperature for sperm production.

To know more about testes visit:

https://brainly.com/question/8297495

#SPJ11

The equivalence point pH of the solution formed by the titration of 50.00 mL of 0.150 M acetic acid using 25.00 mL of 0.300 M NaOH is (C) 7.00.

Acetic acid is a weak acid, and NaOH is a strong base. The reaction between them produces water and sodium acetate, which is a salt. At the equivalence point, the moles of acid and base are equal, and all the acid has been neutralized. The resulting solution contains only the salt and water. The pH of a solution containing only a salt and water can be calculated using the Kw expression. For sodium acetate, the anion acetate acts as a weak base, and the cation sodium has no acidic or basic properties. Therefore, the pH of the solution is equal to the pKa of acetic acid (4.76) plus log([NaOH]/[acetic acid]). Plugging in the values gives a pH of 7.00, which is option (C).

learn more about pH here:

https://brainly.com/question/15289741

#SPJ11

The relationship between Ka and Kb at 25°C for a conjugate acid-base pair is that they are inversely proportional to each other. This means that if Ka is high, then Kb will be low and vice versa.

This relationship is based on the fact that the Ka and Kb values represent the strengths of the acid and base in the pair, respectively. Therefore, as the acid gets stronger (higher Ka), the corresponding base gets weaker (lower Kb). Conversely, as the base gets stronger (higher Kb), the corresponding acid gets weaker (lower Ka). This relationship can be expressed mathematically using the equation Ka x Kb = Kw, where Kw is the ionization constant of water.
Hi! The relationship between Ka (acid dissociation constant) and Kb (base dissociation constant) for a conjugate acid-base pair at 25°C is given by the equation:
Ka × Kb = Kw
Here, Kw is the ion product constant of water, which is equal to 1.0 × 10^(-14) at 25°C. This equation shows that the product of the dissociation constants for the conjugate acid and base is constant at a specific temperature.

To know more about conjugate acid-base visit:

https://brainly.com/question/14832759

#SPJ11