Describe the composition of Earth’s atmosphere

Answer:

C

Explanation:

Warm water is heated by the Gulf Stream, a warm air current that originates in the Gulf of Mexico. As the warm water moves north, it forces cooler water to sink and move south.

the reason of which I do not believe it is a Rip Tide is because rip tides have been found in both several rivers and oceans, if not all.

Answer:1. metyletevinyl

4. (Z)-3-hydroxypropenal

Explanation:

The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ

First, we shall obtain the limiting reactant. Details below:

3H₂ + N₂ -> 2NH₃

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂

Therefore,

2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂

We can see that only 0.43 g of H₂ is needed in the reaction.

Thus, the limiting reactant is N₂

Finally, we the amount of heat energy produced. Details below:

3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ

From the balanced equation above,

When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.

Therefore,

When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ

Thus the heat energy produced from the reaction is -6.61 KJ

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Answer:

The brain is arguably the most important organ in the human body. It controls and coordinates actions and reactions, allows us to think and feel, and enables us to have memories and feelings—all the things that make us human.

Explanation:

Answer:

The brain is arguably the most important organ in the human body. It controls and coordinates actions and reactions, allows us to think and feel, and enables us to have memories and feelings—all the things that make us human.

Explanation:

Answer:

-0.01 M

Explanation:

Let's consider the following reaction.

A(aq) + 2 B(aq) ⇌ 2 C(aq)

We will make an ICE chart.

        A(aq) + 2 B(aq) ⇌ 2 C(aq)

I        0.10M    0.10M         0M

C        -x            -2x           +2x

E       0.10-x   0.10-2x         2x

According to the chart, the concentration of C at equilibrium is:

2x = 0.02

x = 0.01

The value in the change row for A is:

-x = -0.01 M

A liquid substance that could be used in the laboratory for dissolving dry mortar on floor tiles is vinegar; (i) removing KMnO₄, stains is sodium metabisulfite solution; drying acid anhydrides is concentrated sulfuric acid.

Solvents are substances usually liquids, but may also be gases or solids that dissolve other substances known as solutes.

Solvents are usually used as cleansing agents.

One possible liquid substance that could be used for dissolving dry mortar on floor tiles is a mild acid solution, such as diluted hydrochloric acid or vinegar.

KMnO₄ stains are often difficult to remove, but one substance that can be used is sodium metabisulfite (Na₂S₂O₅) solution. Sodium metabisulfite acts as a reducing agent and can effectively neutralize and remove KMnO₄ stains.

Concentrated sulfuric acid is commonly used in the laboratory as a drying agent. It has a strong affinity for water and can efficiently absorb moisture, including water present in acid anhydrides.

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Answer:

B

Explanation:

I think the answer is Diffusion and Osmosis

The processes that provide evidence of the particulate nature of matter would be diffusion and osmosis.

Thus, both diffusion and osmosis back up the particulate nature of matter.

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Answer:

Ok?

Explanation:

475 g is the correct response to the query. This is true because the combined mass of two solutions with masses of 450 g and 350 g equals 800 g. 125 g of solid crystals are created and fall to the bottom of the container as a result of a chemical reaction.

As a result, the mass of the residual solution is equal to 475 g, or 800 g less 125 g. It is significant to observe that the masses of the two solutions that were combined originally do not equal those of the solid crystals or the leftover solution.

This is because the two solutions' chemical reaction when combined results in a transition of the matter that is resulting in the production of a new substance.

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The number of liters of oxygen, O₂, required at STP to react with 11.2 liters of CH₄ to form only CO₂ and H₂O is 22.4 liters.

The number of liters of O₂ required at STP to react with 11.2 liters of CH₄ to form only CO₂ and H₂O is determined from the balanced equation of the reaction as follows:

The balanced equation of the reaction of O₂ at STP CH₄ to form only CO₂ and H₂O is given below:

CH₄ + 2 O₂ (g) ----> CO₂ (g) + 2 H₂O (g)

From the balanced equation of the reaction of O₂ at STP CH₄, 2 moles of  O₂ reacts with one mole of CH₄.

At STP, the volume of one mole of CH₄ is equal to 22.4 liters

The number of mole of CH₄ in 11.2 liters of CH₄ will be 11.2 / 22.4 = 0.5 moles

The moles of oxygen required will be 0.5 liters * 2 /1 = 1 mole of oxygen.

At STP, the volume of one mole of O₂ is equal to 22.4 liters.

Hence, 22.4 liters of oxygen are required.

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Answer:

John Dalton

Explanation:

The number of unit cells in the given quantity is 2.23x10²³ unit cells

:Given Aluminum has an atomic mass of 27g mol-1

>Crystal is face-centered cubic structure

 >number of aluminium atoms in l0 g mass        

 so w =10g

> the number of unit cells in the given quantity is to be calculated 

Number of atoms of Al  = (mass /molar mass ) x Nₐ

                        =(w/M)xNa   , where Na =6.022x 10²³

There are 4 atoms present in the unit cell it will crystallize in a face-centered  cubic crystal
.>.On solving the above values

we get the number of unit cells as= (10/27)x 6.022x10²³ unit cells

The number of unit cells in the given quantity is 2.23x10²³  unit cells

this question is incomplete.

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The result of the computation when you follow the steps is 1.699.

A logarithm is a mathematical function that represents the exponent or power to which a specific base must be raised to obtain a given number. In simpler terms, it answers the question: "To what power must we raise a base number to obtain a certain value?"

What you should do is that on your calculator, you could press the logarithm key and then put in the value that has been shown and then the result would be displayed on your calculator.

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Answer:

[OH-] for this solution is 4.255*10^-12

Explanation:

We are given

[H+] = 2.35 × 10-3 M

we need to find the concentration of [OH-]

we know from Equilibrium

[H+][OH-] = 10^-14

[OH-] = 10^14/2.35*10^10^-3

[OH-] = 0.4255*10^-11

[OH] = 4.255*10^-12

Therefore the Concentration  of [OH-] for this solution is 4.255*10^-12

Since what we have is an alpha decay, the missing component is 234/90 Th

Alpha decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle, which is a helium nucleus consisting of two protons and two neutrons. During alpha decay, the atomic number of the parent nucleus decreases by two, and the mass number decreases by four.

Apha particles can be stopped by a thin layer of material such as paper or skin, and they do not penetrate very far into matter.

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The concentration of the solution is obtained as 0.134 M.

We know that titration is a method of analysis that depends on the volume of the solutions in order to determine the concertation.

We know that;

Total volume of the vinegar = 5 ml + 25 mL = 30 mL

Concentration of the sodium hydroxide =  0.1098M

Volume of the sodium hydroxide used = 37.83ml -  1.35 ml = 36.48 mL

Using the formula;

CAVA/CVB = NA/VB

CAVANB = CBVBNA

CA= CBVBNA/VANB

CA = 0.1098 * 36.48  * 1/30 * 1

CA = 0.134 M

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The island was it before there were just two dodos left in 44 years.

The bird was first seen by Portuguese sailors around 1507 and was exterminated by humans and imported animals. The Dodo was extinct by 1681 the Reunion solitaire by 1746, and Rodriguez solitaire around 1790. The last dodo bird went extinct on the island of Mauritius more than 300 years before him. The Indian Ocean.

The last dodo bird was killed in 1681. Although the dodo bird's demise story is well documented no complete specimen of the bird has been preserved. There are only fragments and sketches. The dodo bird is just one of Mauritius's endangered bird species. Overharvesting of birds, combined with habitat loss and loss of competition from newly introduced animals, was just too much for the dodo to survive. The last dodo was killed in 1681 this species was forever endangered.

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Answer:

When carbon dioxide reacts with water carbonic acid is formed, from which hydrogen ions dissociate increasing the acidity of the systemCarbon dioxide emissions to the atmosphere can therefore increase the acidity of land, sea and air

Explanation:

The difference in the number of cations and anions in the given mixture is approximately 0.0005 mol.

The molar mass of Na2SO4 (sodium sulfate) can be calculated as follows:

2(Na) + 1(S) + 4(O) = 2(22.99 g/mol) + 32.07 g/mol + 4(16.00 g/mol) = 142.04 g/mol

The number of moles of Na2SO4 :

moles of Na2SO4 = mass of Na2SO4 / molar mass of Na2SO4

moles of Na2SO4 = 1.49 g / 142.04 g/mol ≈ 0.0105 mol

Similarly, the molar mass of Al2(SO4)3 (aluminum sulfate) :

2(Al) + 3(S) + 12(O) = 2(26.98 g/mol) + 3(32.07 g/mol) + 12(16.00 g/mol) = 342.15 g/mol

The number of moles of Al2(SO4)3:

moles of Al2(SO4)3 = mass of Al2(SO4)3 / molar mass of Al2(SO4)3

moles of Al2(SO4)3 = 3.42 g / 342.15 g/mol ≈ 0.0100 mol

For Na2SO4, the ratio of cations (Na+) to anions (SO42-) is 2:1. So, the number of cations in 0.0105 mol of Na2SO4 is 2 * 0.0105 mol = 0.0210 mol, and the number of anions is 0.0105 mol.

For Al2(SO4)3, the ratio of cations (Al3+) to anions (SO42-) is 2:3. So, the number of cations in 0.0100 mol of Al2(SO4)3 is 2 * 0.0100 mol = 0.0200 mol, and the number of anions is 3 * 0.0100 mol = 0.0300 mol.

Calculating the difference in the number of cations and anions:

Difference = (Number of Cations in Na2SO4 + Number of Cations in Al2(SO4)3) - (Number of Anions in Na2SO4 + Number of Anions in Al2(SO4)3)

Difference = (0.0210 mol + 0.0200 mol) - (0.0105 mol + 0.0300 mol)

Difference = 0.0410 mol - 0.0405 mol

Difference ≈ 0.0005 mol

Therefore, the difference in the number of cations and anions in the given mixture is approximately 0.0005 mol.

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Answer:

Its B

Explanation:

I just took the quiz.

When \(CH_{3} Br\) and OH collide in order to react and form \(CH_{3} OH\) , such reaction will be best represented by diagram (B).

A chemical reaction would be a procedure that causes one group of chemical components to change chemically into another. In a chemical reaction, one or even more substances also known as reactants would be changed into one or more additional materials known as products. Chemical elements and chemical compounds make up substances.

A colloid would be a mixture wherein the component made up of insoluble particles that are scattered at a microscopic scale is suspended within another component.

When

\(CH_{3} Br + OH\) → \(CH_{3} OH + Br\).

By the Collison of  methyl bromide with OH ion then methyl alcohol will be formed.

Therefore, when \(CH_{3} Br\) and OH collide in order to react and form \(CH_{3} OH\) , such reaction will be best represented by diagram (B).

Therefore, the correct answer will be option (B).

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Answer:

Tarnished is to Image or reputation

Answer:

it's B: light knocks electrons off metal atoms

Answer:

Empirical formula is Au₂O₃

Explanation:

Given data:

Percentage of oxygen = 11%

Percentage of gold = 89%

Empirical formula = ?

Solution:

Solution:

Number of gram atoms of O = 11 / 16 = 0.69

Number of gram atoms of Au = 89 / 197 = 0.45

Atomic ratio:

                Au               :          O    

           0.45/0.45        :      0.69  /0.45

                    1               :           1.5      

Au  : O = 1 : 1.5

Au  : O = 2( 1 : 1.5)

Empirical formula is Au₂O₃.

Answer:

You have a pressure change and temperature change - you can use the combined gas law:

P1V1/T1 = P2V2/T2

Where P1 = 1am

          P2 = 0.8atm

T1 = 273K

T2 = 273 + 22 = 295K

V1 = 1.2lL

V2 = x

Explanation:

The temperature changes for the water and the metal can be calculated by subtracting their initial temperatures from the final temperature.

AT (water) = √°C - °℃

AT (metal) = √°C - °℃

The above equations give the temperature changes for the water and the metal, respectively. The specific values of the temperatures and the final temperature are not provided, so the actual temperature changes cannot be determined without knowing these values.

In general, the temperature change of a substance is given by the difference between the final and initial temperatures. When a warmer object comes into contact with a cooler one, heat energy is transferred from the warmer object to the cooler one until they reach thermal equilibrium, where their temperatures become equal.

The magnitude of the temperature change depends on factors such as the specific heat capacity of the substances involved and the amount of heat exchanged between them.

To accurately calculate the temperature changes, the specific heat capacities of water and the metal would be needed. Additionally, the masses or quantities of the substances would be necessary to determine the amount of heat exchanged. Without these specific values, it is not possible to provide a precise numerical answer.

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dolphin and whales use echolocation

Answer:

100 POINTS! (50 split up) PLSSSSSSSSSS HELP!!! I REALLY NEED IT SO MUCH :( I PROMICE TO GIVE BRAINLIEST AND FIVE STARS AND A THANKS! 6TH GRADE SCIENCE! i used all my points for this!

You measure the mass of an apple using a balance. You get these three measurements:

Trial 1: 167.0 g

Trial 2: 166.9 g

Trial 3: 167.2 g

You know that the true mass of the apple is 172 g. Describe your results in terms of precision and accuracy. Explain your answer in a paragraph for the best grade.

Explanation:

Answer:

True

Explanation:

Carbon is the backbone of life on Earth. Most of Earth's carbon, about 65,500 billion metric tons is stored in rocks. The rest is in the ocean, atmosphere, plants, soil, and fossil fuels. Carbon flows between each reservoir in an exchange called the carbon cycle, which has slow and fast components.