Question 5 of 5
A spiral staircase like the one shown can be a model of the
structure of a DNA molecule.
In this model, what do the steps on the staircase represent?

Answer:

The first step would  be searching for your scientific vocabulary the second step is to write it down and then that would be your answer.

Explanation:

Hope this helps!

Answer: Volume of H2 gas is 30.576 Litres

Explanation:

The reaction between HCl and Zn is as follows:

Moles of HCl = 100/36.5 = 2.73 moles

Moles of Zn = 100/65 = 1.53 moles

As per Reaction and available reagents , HCl is the limiting reagent.

So, we can say that :

2 moles HCl gives 22.4 L of H2 gas.

=> 2.73 moles of HCl gives

So, final answer is:

Volume of H2 gas is 30.576 Litres.

One of the following substances would be the most soluble in CCl₄ is C₄H₁₀.

CCl₄ is carbon tetra chloride is an organic compound with a sweet smell and colorless liquid.

It is used in liquid for refrigerator, as a pesticide, a propellant for aresol cans and in fire extinguisher, but it is very a harmful substance that why it is banned.

Thus, the substances would be the most soluble in CCl₄ is C₄H₁₀.

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The relative ratio, uav : ump : urms of a gas at a given temperature is 56 / 22 : 2 : 3.

Temperature is the measurement of hotness or coldness of a body. It shows the direction of flow of heat.

The relative rate (RR), also known as a rate ratio, is the ratio of the disease or death incidence rate in the exposed group to the disease or death incidence rate in the unexposed group.

Thus, the relative ratio, uav : ump : urms of a gas at a given temperature is 56 / 22 : 2 : 3.

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Answer:

Long answer

Proteins are the building blocks of the body, each and every organ muscle and skin and cells are made of proteins. They can also be used for providing energy to the body in a state where other energy sources aren't available.

Fats are stored energy blocks which can be used by the body at its own convenience whenever there is a deficit of energy in the body. They can also be directly burnt to give energy in cases where energy needs of the body are not met by dietary intake

Carbohydrates are the most convenient and preferable source of energy in the body and are easily converted to give out immidiate energy to the body, excess carbohydrates can be converted into fats and stored for later usage as and when required by the body.

Proteins, fats and carbohydrates have many secondary functions and roles in the human body. If you are keen to know anything more specific feel free to ask.

Fats are used for energy after they are broken into fatty acids. Protein can also be used for energy, but the first job is to help with making hormones, muscle, and other proteins.

Answer:

Most Nutrients are digested into easy and simpler compounds. Carbohydrates are used for energy . Fats are used for energy after they are broken into fatty acids. Protein can also be used for energy, but the first job is to help with making hormones, muscle, and other proteins.

From the calculations and data, the equilibrium constant is 16.

The term equilibrium refers to the state in which the rate of forward reaction and the rate of reverse reaction becomes equal.

Setting up the ICE table

Concentration of HI =  4.00 mol /2.00l  = 2 M

Concentration of H2 and I2 = 0.4 M

Hence;

             2HI <==> H2(g) + I2(g)

I             2             0            0

C            -x           +x            +x

E           2 - x         0.4         0.4

Hence x = 0.4

[HI]eq =

2 - 0.4 = 1.6

Keq = (1.6)^2/(0.4)^2 = 2.56/0.16 = 16

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Answer: 14.24

Explanation:

Answer:

C Ammonia

Pure water is neutral, so pH is about 7

Vinegar is acidic, pH is around 2-3

Ammonia is alkaline, pH around 11.6

Vitamin C is also acidic, pH is around 3.5 to 6

As pH increases with how alkaline the substance is, substances with a lower pH is more acidic, while substances with a higher pH is more alkaline

the question is asking for the highest pH, so you should choose the most alkaline substance

therefore the ans is C, which is ammonia

Answer:

There are 7 diatomic elements: hydrogen, nitrogen, oxygen, flourine, chlorine, iodine and bromine

The change which increase the rate of the reaction is by increasing the amount of solution.

Rate of the reaction gives idea about the speed of the completion of the reaction or the formation of the products.

Given chemical reaction is:
2H₂O₂ [tex]\overset{MnO_{2}}{\rightarrow}[/tex] 2H₂O + O₂

In the above chemical reaction MnO₂ acts as a catalyst which helps in increasing the rate of the reaction without being involved in the reaction. So the formation of the product depends only on the concentration of the solution. So, by increasing the solution amount will increase in the rate.

Hence, increasing the amount of solution will increase the rate.

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Answer:

B. increasing the amount of solution

Explanation:

took the test:)

The compound nitrogen have most positive oxidation state is NO₂. The correct option is b.

The total number of electrons gained or lost by an atom in order to form a chemical bond with another atom.

The charge on an ion is equal to the sum of the oxidation states of all the atoms in the ion. A substance's more electronegative elements are given a negative oxidation state.

A positive oxidation state is assigned to the less electronegative element.

Thus, the correct option is b, NO₂.

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The illustration would be that of a double replacement reaction.

They are reactions in which 2 ionic compounds exchange ions to form two new products.

Thus, in the reaction: ab + cd ----------> ad + cb

ab and cd are two ionic compounds. The b in ab is replaced by the d in cd while the d in cd itself is replaced by the b in ab. Hence, new products, ad and cd, are formed.

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The value of [tex]K_{a}[/tex] for HF is, 3.5 x [tex]10^{-4} M[/tex]

The aqueous solution definition means simply that something has been dissolved in water. The aqueous symbol is (aq). Aqueous solution definition: something is dissolved in water.

Solution : Given,

pH = 2.03

Concentration of HF = 0.25 M

First, we have to calculate the concentration of [tex]H^{+}[/tex] ion.

pH=-log [[tex]H^{+}[/tex]]

2.03=-log [[tex]H^{+}[/tex]]

[tex]H^{+}[/tex]= 9.3 x [tex]10^{-3} M[/tex]

Now we have to calculate the value of  [tex]K_{a}[/tex] for HF.

The equilibrium reaction will be:

[tex]HF\leftrightharpoons \ H^{+}+F^{-}[/tex]

Concentration of  [tex]H^{+}[/tex] = Concentration of  [tex]F^{-}[/tex]= 9.3 x [tex]10^{-3} M[/tex]

The expression of [tex]K_{a}[/tex] for HF will be,

[tex]k_{a} =\frac{[F]^{-} [H]^{+} }{HF}[/tex]

[tex]K_{a}[/tex] = 3.5 x [tex]10^{-4} M[/tex]

Therefore, the value of [tex]K_{a}[/tex] for HF is, 3.5 x [tex]10^{-4} M[/tex]

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Taking into account the definition of dilution, a volume of KI solution of 0.125 L of concentration of 3 M would use to make 0.3L of KI solution of 1.25 M.

When it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.

Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.

In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.

A dilution is mathematically expressed as:

Ci×Vi = Cf×Vf

where

In this case, you know:

Replacing in the definition of dilution:

3 M× Vi= 1.25 M× 0.3 L

Solving:

Vi= (1.25 M× 0.3 L)÷ 3 M

Vi= 0.125 L

In summary, a volume of KI solution of 0.125 L of concentration of 3 M would use to make 0.3L of KI solution of 1.25 M.

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The cell reaction for the voltaic cell is 2Cr(s) + 3Cl₂(g) → 2Cr₃ + (aq) + 6Cl⁻ (aq). The correct option is d.

A voltaic cell is an electrochemical cell that generates electricity through a chemical reaction.

A voltaic cell's most important components are: The anode is an electrode that undergoes oxidation. The cathode is an electrode that undergoes reduction.

Thus, the correct option is d, 2Cr(s) + 3Cl₂(g) → 2Cr₃ + (aq) + 6Cl⁻ (aq).

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Answer:

the second one is the correct answer

Answer:

its b

Explanation:

Answer: 56.5 J

Explanation:

The detriment of these advancements to the Earth is that: the growing population is taxing Earth's resources which could lead to the extinction of many species.

Various scientific discoveries and technological advances around the world have led to an exponential increase in Earth's population with no end of the growth in sight.

In conclusion, we can infer and logically deduce that the statement which best describes how these advancements are detrimental to the Earth is that the growing population is taxing Earth's resources and this may likely lead to the extinction of many species of organisms.

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Answer:

D

Explanation:

1/2 will be lit with 'daylight' and the other half will be dark

Answer:biomass energy, hydropower, and wind energy

Explanation:

Answer:

Climate change and an increase in unpredictable and extreme weather is a growing challenge. Long periods of drought affect clean water supplies while flooding can pollute clean water sources and cause outbreaks of disease.

Answer:

could be areas they live in

The amount of heat which is released during the given change is -1,369.68 Joules.

Required amount of heat in any chemical reaction will be calculated as:

Q = mcΔT, where

m = mass = 4.25 + 60 = 64.25g

c = specific heat = 4.18 J/g. degree C

ΔT = change in temperature = 16.9 - 22 = -5.1 degree C

On putting values, we get

Q = (64.25)(4.18)(-5.1) = -1,369.68 J

Hence released heat in the reaction is -1,369.68 J.

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Sorry this is late but the molecules in the substance will move much slower and take up less place as a molecule that moves faster will take up more space

Hope this helps :))

The force that causes a fishing line to snaps due to the inability to hold the weight of a fish is called the Tension Force

A tension force is a force that acts upon a surface, material and a line. It acts on a line as a result of a force that causes the line to stretch.

Tension acts on the two ends of a line, it can be said to be an action and reaction force.

Tension acting on a fishing line comes from the fisherman and the fish to be caught. The tension meets at the middle of the line and when the line is not strong enough to hold such amount of force it snaps.

In conclusion, The force that causes a fishing line to snaps due to the inability to hold the weight of a fish is called the Tension Force

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Answer:

[tex] \textbf{ \huge\boxed{ \sf ETHENE}}[/tex]

Explanation:

As the above statement says two carbon atoms are bonded to each other with double bond, the suffix used for double bond is -ene & the prefix for two carbon atoms is eth- & it says four Hydrogen atoms are attached to carbons, 2 Hydrogens to each carbon above & below.

When we draw the structural formula it comes out that the molecule is ethene.

Look at image for more clarification

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The correct order of the vertical cross-section of soil layers is organic, topsoil, subsoil, parent rock, and bedrock.

The soil profile is the vertical cross-section of soil from the top to the underlining bedrock layer.

Starting from the top, soil contains organic materials in the form of decomposing leaves, twigs, etc. Immediately after the organic materials lies the topsoil.

After the topsoil comes the subsoil, parent rock, and bedrocks respectively.

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Answer:

A organic, topsoil, subsoil, parent rock, bedrock

Explanation: