PLEASE HURRY ASAP
The image below shows a certain type of global wind:

The Earth is shown as a circle. Equator is shown and labeled at 0 degrees. 30 degrees north and south latitudes are shown and labeled. 60 degrees north and south latitudes are shown and labeled. Curved arrows are shown pointing from the top and bottom ends of the circle towards 60 degrees north and s
What best describes these winds?

Polar easterlies caused due to sinking, cool air above the poles
Polar easterlies caused due to rising, warm air above the poles
Trade winds caused due to sinking, cool air above the equator
Trade winds caused due to rising warm air above the equator

A town is questioning whether to close down a factory that may be polluting its river.  the following statements best describes how science can help the town is Science will obtain non- bias evidence.

A science investigation is free from bias. To conduct the proper investigation we should make sure it will be free from bias. science verify with more data sources and multiple sampling check. Review findings.

Thus, A town is questioning whether to close down a factory that may be polluting its river.  the following statements best describes how science can help the town is Science will obtain non- bias evidence.

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Answer: A. Science will obtain non-bias evidence

Explanation:

The pH of each of the following aqueous solutions is:

(a) pH = 1.00

(b) pH = 1.51

(c) pH = 7.0

(d) pH = 12.28

The pH of a medium is the negative logarithm to base 10 of the hydrogen ion concentration of the medium.

pH = - log [H⁺]

The pH of each of the following aqueous solutions is given below:

(a) 10.0 mL of 0.10 M HCI

[H⁺] = 0.1 M

pH = - log 0.1

pH = 1.00

(b) 10.0 mL of 0.10 M HCI plus 5.0 mL of 0.10 M NaOH

0.5 mmoles of H⁺ will react with 0.5 mmoles of OH⁻

moles of H⁺ remaining = 0.5 mmoles

volume of solution = 15 mL

[H⁺] = 0.5/15 = 0.033 M

pH = - log 0.033

pH = 1.51

(c) 10.0 mL of 0.10 M HCI plus 10.0 mL of 0.10 M NaOH

1.0 mmoles of H⁺ will react with 1.0 mmoles of OH⁻

moles of H⁺ remaining = 0.0 mmoles

hence the solution is neutral

pH = 7.0

(d) 10.0 mL of 0.10 M HCI plus 15.0 mL of 0.10 M NaOH

1.0 mmoles of H⁺ will react with 1.0 mmoles of OH⁻

moles of OH⁻ remaining = 0.5 mmoles

volume of solution = 25 mL

[OH⁻] = 0.5/25 = 0.02 M

pOH = - log 0.02

pOH = 1.72

pH = 14 - pOH

pH = 14 - 1.72

pH = 12.28

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0.66 moles of aluminum are needed to react completely with 2 moles of FeO.

Given,

the chemical equation is,

Al(s)+3FeO(s)—>3Fe(s)+Al2O3(s)

1 mole of aluminum is needed to react completely with 3 moles of FeO.

then,

no of moles of aluminum are needed to react completely with 2 moles of FeO = 2/3 = 0.66 moles

Hence, 0.66 moles of aluminum are needed to react completely with 2 moles of FeO.

A chemical element with the symbol Al and atomic number 13 is known as aluminium (or aluminium in American and Canadian English). Aluminum has a density that is around one third that of steel, which is lower than that of most common metals. It has a strong affinity for oxygen, and when exposed to air, creates a protective oxide coating on the surface. Aluminum visually resembles silver due to similarities in colour and light-reflecting properties. It is ductile, soft, and non-magnetic. Aluminum is the twelfth most prevalent element in the universe based on the frequency of its one stable isotope, 27Al, which is also the only stable isotope. Radiodating makes use of 26Al's radioactivity. A chemical element with the symbol Al and atomic number 18 is called aluminium (aluminium in American and Canadian English).

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ANSWER

The mass of solid dye the student will use to prepare the solution is 178.15 grams

STEP-BY-STEP EXPLANATION:

What to find? The grams of the solid dye

Giving parameters

The mole of red #40 dye = 0.359 M

The molecular mass of red#40 = 496.42g/mol

The grams of the red#40 dye can be calculated by using the below formula

Hence, the mass of solid dye the student will use to prepare the solution is 178.15 grams

18.4 × 10^(24) water molecules are contained in a 0.50L bottle of water.

Given,

Density of water = 1.00 g/mL

Volume of water = 0.50L = 500 ml

We can calculate the mass of water.

As we know that,

Density = mass/ volume

By substituting the values, we get

1 = Mass / 500

Mass = 500 g.

Now, we know

Molar mass of water = 18 g

Mass of water = 500g

We will calculate the moles of water

Mole = given mass / molar mass

= 500/18 = 27.7 moles

As we know that,

1 mole = 6.673 × 10^(23) molecules

So, 27.7 moles contain = 6.673 × 27.7 × 10^(23)

= 18.4 × 10^(24) molecules

Thus, we concluded that 18.4 × 10^(24) water molecules are contained in a 0.50L bottle of water.

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A single replacement reaction, is a type of reaction in which we have the following set up:

A + BC -> AC + B

As we can see, an element will react and switch places in a molecule, forming a new molecule and a lone element as products, and according to this set up, we don't have two ionic reactants as characteristic for a single replacement reaction, therefore letter C is the incorrect option.

The name of the given compound is aluminum cyanide . and the molecular mass of the compound Al(CN)3 is 104.98g .

A metallic cyanide is aluminum cyanide. Al(CN)3 is the chemical formula. By reacting aluminum metal and mercuric cyanide in liquid ammonia, aluminum cyanide was created as an ammoniate. Water breaks down aluminum cyanide to produce aluminum hydroxide.

The mass of a given molecule is its molecular mass (m), which is expressed in daltons (Da or u). Because they contain various isotopes of an element, multiple molecules of the same substance can have distinct molecular weights. According to IUPAC, the related quantity relative molecular mass is a unitless comparison between the mass of a molecule and the unified atomic mass unit (also called the dalton). The molar mass is unrelated to, but distinct from, the molecular mass and relative molecular mass. The molar mass, which is stated in g/mol, is defined as the mass of a specific material divided by the amount of a substance. As a result, the molar mass represents the average of several molecules or particles.

Molecular mass of Al(CN)3 = 26.98 + 3×12 + 3×14 = 104.98g

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Explanation:

We have a 2.71 mL at STP and we want to find the number of moles. So we know that:

V = 2.71 mL n = ? R = 0.082 atm*L/(mol*K) T = 273.15 K P = 1 atm

To find the number of moles we can use the ideal gas law and solve it for n:

P * V = n * R * T

Answer: Ideal Gas Law

There are eight bonding electrons and one non-bonding pair of electrons across the Se atom. The Lewis structure is, for this reason, a legitimate Lewis structure of SeF4 S e F four can't be drawn without violating the octet policies.

Lewis structures, additionally called Lewis dot formulas, Lewis dot systems, electron dot structures, or Lewis electron dot systems, are diagrams that show the bonding among atoms of a molecule, in addition to the lone pairs of electrons that can exist within the molecule.

The Lewis structures became named after Gilbert N. Lewis, who added it in his 1916 article The Atom and the Molecule. Lewis structures extend the idea of the electron dot diagram by way of including lines between atoms to represent shared pairs in a chemical bond.

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The molar mass of CO = 28.01 g grams are in  1.98x [tex]10^{15}[/tex] molecules of CO is 9.20× [tex]10^{-8}[/tex] g.

Avogadro's number is a proportion that compares atomic molar mass to human physical mass.

The molar mass of CO = 28.01 g

grams are in 1.98x [tex]10^{15}[/tex] molecules of CO

= 28.01x  1.98x [tex]10^{15}[/tex]/ 6.023 x 10²³

=9.20× [tex]10^{-8}[/tex] g.

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The heat change experienced by the calorimeter is 5.1339J.                                                                      

Total mass of solution = 50 + 50 = 100ml

Density = 1 g/ml

mass = 100 gm

Q = (msΔt)solution + (sΔt) mixture

    = (100×4.18×4.71) + (4.70 ×4.71)

   = 1980.78 + 22.137

   =2002.9 J

mole of AgNo₃ = 50×0.360/1000

                          = 0.0018

a mole of Kcl = 50×0.200/1000

                    = 0.010

The limiting reagent in a chemical reaction is a reactant that is definitely eaten up whilst the chemical reaction is completed. the amount of product fashioned is limited via this reagent, for the reason, that response can not hold without it.

The limiting reagent in a chemical reaction is the reactant with a view to be consumed completely. as soon as there is no greater of that reactant, the response can not proceed. Therefore it limits the response from continuing. The extra reagent is the reactant that would maintain reacting if the other had now not been consumed.

The limiting reagent is KCl so, moles of precipitate formed 0.010

ΔH exothermic = - 0,6568/0.01 = -65.68

Hence ΔH ext = - 65.68 kJ/mol

Theoretical moles of precipitate formed = 0.01 moles

Heat change by combustion = 100×4.70×4.18

                                               = 1964.6 J

Heat change experienced by calorimeter is = 4.70 × 1.09

                                                                         = 5.1339J

The heat of solution  = 1964.6 J + 5.1339J

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Answer:

B!! I know this is right because I took this test.

Here we have to multiply two values of length, so the result will be a value of surface, that means that the result will have the same unit and squared:

So, the correct answer is 405.3 cm^2.

The true statement about Air is that :

Air is made of tiny particles that move separately from one another.

Gas particles move quickly in all directions and regularly collide with one another and the container's side. The particles gather kinetic energy and accelerate as the temperature rises.

Any physical phenomenon where a quantity is continuously undergoing minor, random fluctuations is referred to as Brownian motion. Robert Brown, a Scottish botanist, who was the first to observe this fluctuation, was honored with its name.

Thus, the tiny particles in the air continues to move.

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2.49 * 10^23 formula units make up a sample of aluminum sulfide that weighs 62.2 g.

Describe a mole.

A mole is 6.022 * 10^23 atoms, molecules, ions, or other particles.

The number of formula units in the 62.2 g sample of aluminum sulfide is specified in the question.

Calculating the number of moles is necessary to get the number of formula units.

Aluminum Sulfide has a molecular weight of 150.158 gm.

1 mole is made up of 150.158 g of aluminum sulfide.

62.2 g will yield 0.414 moles when multiplied by 1 / 150.158.

Formula units: 6.022 * 10^23 equals one mole.

0.414 moles = 6.022 * 10²³ *0.414

= 2.49 x 10^23 mathematical units.

A 62.2 g sample of aluminum sulfide therefore has 2.49 * 10^23 formula units.

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answer and explanation

the balanced chemical reaction for the formation of nitrogen dioxie is

2NO + O₂ → 2NO₂

and so at STP the number of mols of nitrogen dioxide in 4.50L would be

PV = nRT

n = PV/RT

= (1atmx 4.50L) / (8.314 x 273.15K

= 4.50/2270.97

= 0.00204 mols

0.00204 mols of nitrogen dioxide would have been formed from the reaction.

we know from the balance reaction that 1 mol of oxygen forms 2 mols of nitrogen dioxide and so the mols of oxygen that were present would be

1/2 x0.00204 = 0.00102 mols

we know that 1 mol of a gas occupies a volume of 22.4L at STP and so

0.00102 mols of oxygen would have a volume of

0.0102 mols x 22.4 L/mol

= 0.0228L

0.0228L of oxygen would be needed

Answer:

- A carbonyl group has a carbonyl carbon with only O atom while A haldehyd group has acarbonyl carbon with only OH atom.

[tex].[/tex]

Answer:

- A ketone is not oxidised but aldehyde csn be so

The layer whose temperature drops with the depth is called Thermocline

What is thermocline?

A thermocline is a thin, distinct layer in a large body of fluid (such as water, such as in an ocean or lake; or air, such as an atmosphere), where temperature changes more dramatically with depth than it does in the layers above or below.

A thermocline layer is also called a thermal layer and there are lots of factors responsible for its temperature changes like

• seasonal weather variations,

• latitude

• local environmental conditions, like tides and currents.

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Answer:

Explanation:

Here, we want to describe what happens to an aluminum atom when an aluminum ion is formed

The aluminum atom has 3 valence electrons

To form an ion, like other metals, it has to lose these electrons

By losing these electrons, it is able to form an ion

Hence, an aluminum ion is formed when an aluminum atom loses 3 valence electrons

Answer:

0.476 L

Explanation:

To find the volume of the blood, you need to multiply the given mass (grams) by the density of blood. It is important to arrange the ratio in a way that allows for the cancellation of units (since you are going from grams to mL, grams must be in the denominator).

Density = 1.05 g/mL

 500 grams                1 mL
--------------------  x  ---------------------  =  476 mL
                               1.05 grams

Finally, you need to convert mL to L. The final answer should have 3 sig figs like the given mass.

1,000 mL = 1 L

   476 mL                    1 L
-----------------  x  --------------------  =  0.476 L
                              1,000 mL

For this question, we have the following reaction:

Fe2O3 + 3 CO -> 2 Fe + 3 CO2

For letter D, we have:

10 grams of Fe2O3, molar mass = 159.7g/mol

6 grams of CO, molar mass = 28g/mol

In this case, we need to find which compound is the limiting and which is the excess reactant, and it is important to have in mind the molar ratio concept, which we use the coefficients in front of the compound to determine the ratios, like for Fe2O3 and CO, the molar ratio is 1:3. Now let's check if Fe2O3 is in excess, finding the number of moles first:

159.7g = 1 mol

10g = x moles

x = 0.063 moles of Fe2O3

According to the molar ratio, we need 3 times this value for CO, therefore, 0.063 * 3 = 0.189 moles of CO, now we need to check if this is the amount that we have of CO, or if we have more than that:

28g = 1 mol

6g = x moles

x = 0.214 moles of CO, this means that we have more CO than we actually need, making it the excess reactant and Fe2O3 the limiting reactant

Now to find the mass of Fe, we will be using the number of moles of the reactant, which is Fe2O3, 0.063 moles, and according to the molar ratio, we have twice this value for Fe, therefore, 0.063 * 2 = 0.126 moles of Fe, now using the molar mass of Fe, 55.84g/mol, we can find the final mass:

55.84g = 1 mol

x grams = 0.126 moles of Fe

x = 7.03 grams of Fe are produced, or if it is possible to round up, 7 grams of Fe, this is letter D

E. In this case, we need to see how much CO remains in the reaction, and since we need only 0.189 moles of CO and we actually have 0.214 moles, we have a 0.025 moles leftover, which is, in grams:

28g = 1 mol

x grams = 0.025 moles

x = 0.7 grams of CO remaining, only 5.3 grams will react

F. The percent yield is calculated having the actual yield, given in the question and the theoretical yield, which is the value we found in letter D, the formula for it is:

%yield = (actual yield/theoretical yield)*100

%yield = (6.75g/7.03g)*100

%yield = 0.964*100

The percent yield will be 96.4% for this reaction

The first step we have to follow is to balance the given equation, making the number of atoms of each element equal in both sides of the equation.

Now, that the equation is balanced, we can use the stoichiometric ratio of Na2O to NaOH to find the number of moles of NaOH produced from 1.20moles of Na2O:

2.40 moles of NaOH are produced.

A plane travels 65 m/s for 300 km to its destination and will take 76.923 min to reach the destination.

Given data:

Speed = 65m/s

Distance = 300 km = 300000 m

Time= ?

Speed can be calculated by using the formula:

Speed = Distance/ Time

65 =  300000/ time

Time= 300000/65

 = 4615.38 s

Time taken to reach the destination = 76.923 min

Therefore, the plane will take time travel to reach the destination 76.923 min.

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For this question we will make use of the Combined Gas Law:

Answer to part A)

Given:

P2:660 mmHg

T2:

The energy diagram given is for endothermic reaction process

This is characterized by the system to require more energy to form products.

In this question, specie A and B are the reactant while C is the product.

What happens in this type of reaction is that for products to be formed, the reaction has to attain activation energy which is used to break bonds and form products and this energy has to be gotten from outside the system in order for the reaction to proceed.

The balanced equation is:

Cu + 2AgNO₃ -> 2Ag + Cu(NO₃)₂

The coefficients are: 1, 2, 2, 1

The balancing of chemical equations follows the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.

The equation given from the question can be balanced as follow:

Cu + AgNO₃ -> Ag + Cu(NO₃)₂

There are 2 atoms of N on the right side and 1 atom on the left. It can be balanced by writing 2 before AgNO₃ as s shown below:

Cu + 2AgNO₃ -> Ag + Cu(NO₃)₂

There are 2atoms of Ag on the left side and 1 on the right. It can be balanced by writing 2 before Ag as show below:

Cu + 2AgNO₃ -> 2Ag + Cu(NO₃)₂

Thus, the equation is balanced.

The coeficients are: 1, 2, 2, 1

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6.0 % w/v means:

6.0 g of glucose ------ 100 mL of glucose solution (maybe it is diluted in water)

We need to find the volume of the solution.

Procedure:

6.0 g of glucose -------- 100 mL of solution

In the reaction that is shown in the question;

1) Dichromate ion is reduced while tin II ion is oxidized

2) Fe II is oxidized while  nitrate ion is reduced.

We know that oxidation has to do with the loss of electrons. Thus we say that a specie has been oxidized if the specie looses electrons and we say that a specie has been reduced if the specie gains electrons. The species that is oxidized in a reaction is the oxidizing agent while the specie that is reduced in the reaction is a reducing agent.

Let us note that the procedures of oxidation and reduction does occur at the same time and when this happens, we have a specie whose oxidation number is increased and we say that it has been oxidized while the other specie has received some new electrons and has been said to be reduced.

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Explanation:

We have to perform the following substraction:

4.3 x 10² - 7.0 × 10² = ?

Since both numbers have the same order of magnitude we can directly substract them.

4.3 - 7.0 = -2.7

So the answer to our operation is:

4.3 x 10² - 7.0 × 10² = -2.7 × 10²

Answer: -2.7 × 10²