Explain why precipitation on Earth’s surface is less common over land than it is over the oceans. Base your answer on the water cycle.

Answer:

Doubled.

Explanation:

The relationship between the temperature and the volume of a gas at a constant pressure can be described using Charles' law:

That means that the temperature and the volume of a gas are directly proportional: The higher the temperature, the higher the pressure. If one of those factors is increased twofold, the other one will be increased twofold as well.

The concentration of the HCl solution must be 1.5 M in order to completely neutralize the Sr(OH)2 solution.

To completely neutralize the Sr(OH)2 solution, the concentration of the HCl solution must be 1.5 M.

When HCl and Sr(OH)2 react, they form H2O and SrCl2. The balanced equation is:

2HCl + Sr(OH)2 -> 2H2O + SrCl2

From the balanced equation, we can see that 2 moles of HCl react with 1 mole of Sr(OH)2.

Given that the volume of Sr(OH)2 solution is 50 mL and the concentration is 0.75 M, we can calculate the number of moles of Sr(OH)2:

moles of Sr(OH)2 = concentration * volume

= 0.75 M * 0.050 L

= 0.0375 moles

Since 2 moles of HCl react with 1 mole of Sr(OH)2, we need half the moles of HCl to neutralize the solution:

moles of HCl required = 0.0375 moles / 2

= 0.01875 moles

Now, we can calculate the concentration of the HCl solution needed to provide 0.01875 moles in a 25 mL volume:

concentration of HCl = moles / volume

= 0.01875 moles / 0.025 L

= 0.75 M

Therefore, the concentration of the HCl solution should be 1.5 M to completely neutralize the Sr(OH)2 solution.

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Magnesium and fluorine atoms will most likely form an ionic bond.

Ionic bonds are formed between elements with a large difference in electronegativity, which is the measure of an atom's ability to attract electrons towards itself. Magnesium and fluorine have a difference in electronegativity of 2.13, which is large enough to form an ionic bond.

In ionic bonds, one atom loses electrons and becomes a positively charged ion (cation), while the other atom gains electrons and becomes a negatively charged ion (anion). In this case, magnesium will lose two electrons to become Mg2+ and fluorine will gain one electron to become F-. These two ions will then attract each other electrostatically to form magnesium fluoride (MgF2), which is an ionic compound.

On the other hand, covalent bonds are formed between elements with a small difference in electronegativity, where atoms share electrons to achieve a stable electron configuration. Magnesium and fluorine have a large electronegativity difference, so they are unlikely to share electrons and form a covalent bond. Therefore, magnesium and fluorine will most likely form an ionic bond.

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Answer:

Hey there!

Density=Mass/Volume

Density=1.2/4555

Density=2.63e-4g/cm^3

Let me know if this helps :)

Using Pasteur Pipettes (or pipets) are the most commonly used tool for transferring small volumes of liquids (< 5mL) from one container to another.

A pipette, also called pipett, is a lab instrument frequently used in the fields of chemistry, biology, and medicine to transfer a predetermined volume of liquid, frequently as a media dispenser. Pipettes are available in a variety of styles with varying degrees of accuracy and precision, ranging from simple single-piece glass pipettes to more intricate adjustable or electronic pipettes. In order to draw liquid up and out of a pipette, a partial vacuum is often created above the liquid-holding chamber and then selectively released. Depending on the instrument, measurement accuracy varies substantially.

Although each form of pipette has particular descriptive titles, in practice any sort of pipette will only be referred to as a "pipette," and the required device will be clear from the context. Occasionally, pipettes that dispense.

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Answer: 2,090J

The equation to find the specific heat is determined by the equation q = mcΔT, where q = total heat, m=mass, c = specific heat, and ∆T change in temperature.

Recall that the specific heat capacity for water is 4.18J/gºC

So, plug this along with your specific values into the equation.

q = 100g * (4.18J/gºC) * (20.0ºC-15.0ºC)
q = 2090J

The percent yield of the reaction of H2O2 is found to be 21.16%

The theoretical yield is the yield that is obtained using a balanced chemical reaction. What you actually obtain in a chemical reaction is the actual yield. The actual yield is evaluated with the theoretical yield to establish the percent yield.

2 H2O2 => 2H2O + O2

78.2 mL of 4.6 M solution of H2O2 :

=> 78.2/1000*4.8= 0.359 mole H2O2

2 moles H2O2 ---> 1 mole O2

=> 0.359 moles H2O2-----> x mole O2

 x  => 0.359/2= 0.1795mole O2

0.038 mole O2 was collected

Thus, percent yield = 0.038/0.1795*100=21.16%

Actual Yield is the quantity of a product discovered to be created during a chemical process.

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Ethyl alcohol is widely used as a sanitizing agent due to its ability to kill bacteria and viruses effectively.

Ethyl alcohol, also known as ethanol, is a commonly used compound in sanitizing agents due to its potent antimicrobial properties. It has the ability to effectively kill a wide range of bacteria and viruses, making it a valuable ingredient in various disinfectants, hand sanitizers, and surface cleaners.

One of the reasons why ethyl alcohol is widely used as a sanitizing agent is its ability to denature proteins. When applied to a surface or skin, ethyl alcohol disrupts the cell membranes of microorganisms, causing them to break apart and ultimately leading to their inactivation. This denaturing effect makes it an effective tool for sanitizing and disinfecting surfaces, tools, and even hands.

Moreover, ethyl alcohol evaporates quickly, which contributes to its effectiveness as a sanitizing agent. When applied to a surface, the alcohol evaporates rapidly, ensuring that the contact time between the alcohol and the microorganisms is sufficient to kill them. This quick evaporation also minimizes the residual moisture left on surfaces, reducing the risk of microbial growth.

However, it is important to note that pure ethyl alcohol is highly flammable, with a relatively low flash point and autoignition temperature. These properties make it crucial to handle and store ethyl alcohol-based sanitizers with care, keeping them away from open flames or heat sources that could potentially ignite the alcohol vapors.

In conclusion, ethyl alcohol is widely used in sanitizing agents due to its powerful antimicrobial properties, ability to denature proteins, and quick evaporation. However, it is crucial to be aware of its flammability and handle it with caution to ensure safety during its use.

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Answer:

125g × 1 mol/16 grams = 7.81 × avogadros #

Answer: The answer is fatty acids and triglycerides

Explanation:

To determine the two half-reactions that will produce the largest voltage under standard conditions, we must consider the standard reduction potentials for each half-reaction.

The half-reaction with the more positive reduction potential will be the reduction half-reaction, while the half-reaction with the more negative reduction potential will be the oxidation half-reaction. This is because the reduction half-reaction is where the electrons are gained, while the oxidation half-reaction is where the electrons are lost.

Under standard conditions, the standard reduction potential for the reduction half-reaction must be higher than the standard reduction potential for the oxidation half-reaction. This creates a larger potential difference between the two half-reactions, resulting in a larger overall voltage.

In general, the half-reaction with a metal as the reactant tends to have a more negative reduction potential, while the half-reaction with a non-metal tends to have a more positive reduction potential.

Therefore, to answer the question, we must compare the standard reduction potentials for various half-reactions and select the two that have the largest potential difference. This will result in the largest voltage under standard conditions.

Overall, the selection of the two half-reactions will depend on the specific conditions of the galvanic cell, such as the type of electrodes and electrolytes used. It is important to consider the conditions carefully when selecting the appropriate half-reactions for a given galvanic cell.

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Fertilization occurs in the fallopian tubes, while implantation occurs in the uterus.

Fertilization: Fertilization is the process by which a sperm cell from a male and an egg cell (ovum) from a female combine to form a zygote, which is the first stage of a new individual. Fertilization typically occurs in the fallopian tubes, also known as the uterine tubes or oviducts. When a woman ovulates, an egg is released from one of her ovaries and travels through the fallopian tube toward the uterus. If intercourse occurs during this time and sperm are present in the reproductive tract, they can swim through the cervix, enter the uterus, and reach the fallopian tubes. Fertilization most commonly occurs in the ampulla, which is the widest part of the fallopian tube. Once inside the fallopian tube, the sperm must navigate through the tubal environment and reach the egg. The sperm cells undergo a process called capacitation, which involves changes that enable them to penetrate the egg's outer layer. Eventually, one sperm cell successfully penetrates the egg, and their genetic material combines, forming a zygote.

Implantation:After fertilization, the zygote begins to divide and develop   a multicellular structure called a blastocyst. The blastocyst then travels through the fallopian tube and reaches the uterus, where it needs to implant for further development. Implantation refers to the process in which the blastocyst attaches itself to the lining of the uterus, known as the endometrium. The endometrium undergoes changes during the menstrual cycle to prepare for potential implantation. If the blastocyst successfully implants into the endometrium, it establishes a connection with the maternal blood vessels, allowing it to receive oxygen and nutrients from the mother's body.

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Answer:

D. Stars is the correct answer

Please give my answer the brainliest...

The value of ΔG at 298 K for a reaction mixture containing 1.9 atm N2, 1.6 atm H2, and 0.65 atm, the answer is (a) -3.86 × 10^3.

NH3 can be calculated using the equation:

ΔG = ΔG° + RT ln(Q)

where ΔG is the standard Gibbs free energy change, ΔG° is the standard Gibbs free energy change at standard conditions, R is the gas constant, T is the temperature in Kelvin, and Q is the reaction quotient.

In this case, we are given ΔG° as -33.3 kJ/mol. To calculate Q, we need to use the partial pressures of the gases in the reaction mixture. The reaction stoichiometry tells us that the ratio of the partial pressures of N2, H2, and NH3 is 1:3:2. Therefore, we can write:

Q = (P(NH3))^2 / (P(N2) * P(H2)^3)

Plugging in the given values of P(N2) = 1.9 atm, P(H2) = 1.6 atm, and P(NH3) = 0.65 atm, we can calculate Q. Then, using the value of R = 8.314 J/(mol·K) and the temperature T = 298 K, we can substitute these values into the equation and solve for ΔG.

The calculated value of ΔG at 298 K for the given reaction mixture is approximately -3.86 × 10^3 J/mol. This value is equivalent to -3.86 kJ/mol. Therefore, the answer is (a) -3.86 × 10^3.

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The sources of chemical energy from the available options would be batteries and foods.

Chemical energy is a form of energy derived from the chemical properties of materials.

Most batteries contain chemicals that are able to ionize in solution to produce electric currents in circuits. Chemicals in batteries include sodium chloride, nitric acid, sulfuric acid, etc.

Foods contain chemicals that when hydrolyzed in the body, are able to produce energy to sustain the various processes in the body. The chemicals in foods are mostly carbohydrates.

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The total mass of sodium chloride is 58.44 g/mol.

The mass of sodium is 22.99 g/mol.

To find the percent sodium in sodium chloride can be found by dividing the amounts.

Therefore, the percent sodium is 39%.

Answer:

is there any alian on the mars

Answer:

a. 9.00 x 1013 J

Explanation:

Trust me

Answer:

The number of protons in the nucleus of the atom is equal to the atomic number (Z). The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus.

Answer: I'm pretty sure the answer is Number of Protons

Explanation:

I took the k-12 test

The Earth's atmospheric CO2 concentration was around 280ppm before human activities, but since the Industrial Revolution, burning fossil fuels has increased it to above 400ppm, well outside the range.

The concentration of CO2 in the Earth's atmosphere prior to significant human influences was 280ppm.

Before human activities, such as burning fossil fuels, deforestation, and industrial processes, the concentration of carbon dioxide in the atmosphere was relatively stable for thousands of years. This pre-industrial concentration of CO2 was around 280 parts per million (ppm).

To put it into perspective, 280ppm means that for every million molecules of air, around 280 of them were CO2 molecules. This level was maintained through a balance between natural sources of CO2, like volcanic activity and respiration, and natural sinks, such as photosynthesis and ocean absorption.

Since the Industrial Revolution, the burning of fossil fuels has significantly increased the concentration of CO2 in the atmosphere. Currently, the concentration is above 400ppm, which is considered to be well outside the range seen in the past 800,000 years.

In summary, the concentration of CO2 in the Earth's atmosphere prior to significant human influences was approximately 280ppm.

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Answer:

b

Explanation:

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Answer:

False,not all chemicals pollute the enviorment

Explanation:

Hope this helps!

Brainliest?

Answer:

False

Explanation:

Oxygen?

161.84kJ/mol of energy is required to activate the isomerization of methyl isocyanide,

It is given that the isomerization of methyl isocyanide follows first order kinetics. The half-lives t1/2 is 161min at T₁ 199°C and t1/2 is 5min at T₂ 230°C. The rate constant of first order kinetics is given by,

k = 0.693/half-life

On substituting the values we get,

k₁₉₉ = 0.693/161

k₁₉₉ = 4.3 x 10⁻³/min

Similarly,

k₂₃₀ = 0.693/12.5

k₂₃₀ = 0.055/min

To find the activation energy, the following formula is used

ln(k₁/k₂) = Eₐ/R(1/T₂ - 1/T₁)

On substituting the values we get,

ln(4.3 x 10⁻³/0.055) = Eₐ/8.314(1/503 - 1/472)

On solving the values on both sides we get,

Eₐ = 161.84kJ/mol

Therefore, the activation energy required for the isomerization of methyl isocyanide is 161.84kJ/mol

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The total of all protons and neutrons is Option D, which is the right response. Protons, neutrons, and electrons are the three fundamental particles that make up an atom.

The nucleus of an atom is made up of protons and neutrons, which are collectively referred to as nucleons and are primarily responsible for an atom's mass. Neutrons weigh 1.6749 x 10-27 kg, whereas protons weigh 1.6726 x 10-27 kg.

Protons and neutrons make up the majority of an atom's mass when added together. However, electrons contribute very little to the mass of the atom due to their much smaller mass of 9.11 x 10-31 kg. As a result, Option D is the right response.

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An particle or substance that is negatively charged is known as an anion. A positively charged particle or substance is referred to as a cation.

A cation has a net positive charge because it has more protons than electrons. One or more electrons must be lost in order for a cation to develop; usually, these electrons are drawn away by atoms with a greater attraction for them. After the chemical sign is the amount of lost electrons, which determines the charge of the ion. For example, silver (Ag) loses one electron to become Ag+, while zinc (Zn) loses two electrons to become Zn2+.

An anion has a net negative charge because it has more electrons than protons. One or more electrons must be acquired for an anion to develop, usually taken from atoms that have a lower affinity for them. The charge of the ion is represented by the amount of electrons gained.

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A physical change is a type of change in which the form of matter is altered but one substance is not transformed into another.

The dimensions or shape of matter may be changed, but no reaction occurs. Physical changes are usually reversible. Note that whether a process is reversible or not isn't truly a criterion for being a physical change.

Contrast this with a chemical process, during which chemical bonds are broken or formed so that the starting and ending materials are chemically different. Most chemical changes are irreversible. On the opposite hand, melting water into ice (and other phase changes) is often reversed.

Examples of physical changes include: Crumpling a sheet of paper (an exemplar of a reversible physical change)Breaking a pane of glass (the chemical composition of the glass remains the same)

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Answer:

Filtration can be used to separate an insoluble solid from a liquid, or a precipitate from the reaction mixture in which it formed. The solid which collects in the filter paper is called the residue. The clear liquid which passes through the filter paper is called the filtrate.

Explanation:

i had this question before