what biological molecules transport other substances, provide structural
support, cause the movement of muscles, and catalyze chemical reactions in
living organisms?

Answer:

0.25 g of U-235 isotope will left .

Formula used :

where,

N = amount of U-235 left after n-half lives = ?

= Initial amount of the U-235 = 1.00 g

n = number of half lives passed = 2

0.25 g of U-235 isotope will left .

Answer: 1.57 M

Explanation:

[tex]M_{A}V_{A}=M_{B}V_{B}\\(33.9)M_{A}-=(23.4)(2.28)\\M_{A}=\frac{(23.4)(2.28)}{33.9}=\boxed{1.57 \text{ M}}[/tex]

Taking into account definition of percent yield, the percent yield for the reaction is 82.56%.

The percent yield is the ratio of the actual return to the theoretical return expressed as a percentage.

The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:

[tex]percent yield= \frac{actual yield}{theorical yield}x100[/tex]

where the theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product, that is, it is the maximum amount of product that could be formed from the given amounts of reagents.

Percent yield for the reaction in this case

In this case, you know:

Replacing in the definition of percent yields:

[tex]percent yield= \frac{0.71 g}{0.86 g}x100[/tex]

Solving:

percent yield= 82.56%

Finally, the percent yield for the reaction is 82.56%.

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If the enthalpy is positive and the entropy is positive, the Gibbs energy will always be positive, and the reaction will never be feasible.

The Gibb Free Energy is used to obtain the feasibility of a reaction. If the Gibbs free energy is positive the reaction is not spontaneous. If the value is negative, the reaction is spontaneous while a zero values indicates equilibrium.

From the equation;

ΔG = ΔH - TΔS, it follows that if the enthalpy is positive and the entropy is positive, the Gibbs energy will always be positive, and the reaction will never be feasible.

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125 g/mol is the molar mass of unknown gas. Hence, option C is correct.

The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).

First, calculate the moles of the gas using the gas law,

PV=nRT, where n is the moles and R is the gas constant. Then divide the given mass by the number of moles to get molar mass.

Given data:

P= 2 atm

V= 15 L

n=?

R= [tex]0.082057338 \;L \;atm \;K^{-1}mol^{-1}[/tex]

T=300 K

Putting value in the given equation:

[tex]\frac{PV}{RT}[/tex]=n

n= [tex]\frac{2 \;atm\; X \;15 \;L}{0.082057338 \;L \;atm \;K^{-1}mol^{-1} X 300}[/tex]

Moles = 1.21866 moles

Now,

Moles =[tex]\frac{mass}{molar \;mass}[/tex]

1.21866 =[tex]\frac{153 g}{molar \;mass}[/tex]

Molar mass= 125.54 mole/gram

125 g/mol is the molar mass of unknown gas. Hence, option C is correct.

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Answer:

H20+O2>2FeOH this is the right answer

Answer:

Explanation:

Applying Boyle's Law :

Q1

Q2

We can infer that there are various intermolecular forces between water and ammonia.

The intensity of the intermolecular interactions between a substance's molecules affects its boiling point. Although water and ammonia have comparable molecular sizes and weights, their boiling points differ considerably. This implies that the intermolecular interactions between ammonia and water are different.

The powerful intermolecular force of hydrogen bonding causes water molecules to be drawn to one another. When the hydrogen atom of one water molecule is drawn to the oxygen atom of another water molecule, hydrogen bonding takes place.

As a result, the water molecules are held together by a web of intermolecular forces. These hydrogen bonds need a lot of energy to form. Consequently, water has a high boiling point.

On the other hand, dipole-dipole interactions between molecules occur between ammonia molecules. The nitrogen atom in the polar molecule ammonia (NH3) is more electronegative than the hydrogen atoms.

The hydrogen atoms are somewhat positively charged as a result of this polarity, while the nitrogen atoms are partially negatively charged. Ammonia has a lower boiling point because the dipole-dipole interactions between its molecules are less than the hydrogen bonds in water.

As a result, we can infer that the intensity of the intermolecular forces between water (hydrogen bonding) and ammonia (dipole-dipole interactions) differs based on the drastically different boiling temperatures of the two substances.

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Answer:

neck

Explanation:

through the neck and opening of the thermos, where there is no vacuum.. hence heat is easily transmitted resulting into heat loss

Answer:

Bacteria by binary fission

Starfish

Fungi

Explanation:

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Organisms which apply binary fission are:

[tex]\green\star[/tex]More things to learn about reproduction:

[tex]\blue\star[/tex]There are two modes of reproduction. They are:

Asèxual mode: The mode of reproduction where single parent is enough to give birth another organisms. Eg: Amoeba

Sèxual mode: The mode of reproduction where both parents, male and female are necessary. Eg: Human.

[tex] \boxed{ \frak \red{have \: a \: nice \: day}}[/tex]

Answer:

dipole-induced dipole forces

Explanation:

KI(aq) has potassium and iodine ions in water. Water is a polar molecule. So the type of force must be ion-dipole.

Combined gas equation: P1V1/T1 = P2V2/T2

Solving for V2:

V2 = P1V1T2/P2T1

T1 = 20 °C = 293.15 K

T2 = 30 °C = 303.15 K

V2 = (1.5 × 3.0 × 303.15)/(2.5 × 293.15)

V2 = 1.86 L

The answer is the current passing between the electrodes is 10.56 mA., the direction of current is towards the negative electrode.

Electric charge is the physical property of matter that causes it to experience a force when placed in an electromagnetic field.

Electric charge can be positive or negative (commonly carried by protons and electrons respectively).

Like charges repel each other and unlike charges attract each other

Given that,

Number of sodium ions at the negative electrode, Na⁺ =  2.68 *10¹⁶

Number of chloride ions at the positive electrode,Cl⁻ = 3.92 *10¹⁶

(a) The current flowing in the circuit is due to the positive as well as negative charges such that total charge becomes:

Q= n e

Q = (Na⁺ +Cl⁻) e

Q= (2.68 *10¹⁶ +3.92 *10¹⁶) (1.6*10-19)

Q = 0.01056 C

The current is given by :

I=Q/t  = 0.01056 /1 = 10.56mA

So, the current passing between the electrodes is 10.56 mA.

b) Since, positive ions are moving towards the negative electrode.

And, current is the flow of ions or electrons therefore, the direction of current is towards the negative electrode.

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The current is given by :

So, the current passing between the electrodes is 10.56 mA.

(b) The direction of electric current is towards negative electrodes.

Since we know the atomic masses of the elements, we can sum the atomic masses to obtain the molecular masses. We also know that 1 mole of C atoms weighs 12.01 g and 1 mol of H atoms weighs 1.0079 g. So, we know the molar mass of ethane also. Or, 30.07 g in 1 mole C2H6.

The production of carbon-14 occurs to a large extent in nuclear reactors.

Hence, option D is correct

Carbon-14 is a weakly radioactive isotope of Carbon; also known as radiocarbon, it is an isotopic chronometer.

Carbon-14 is produced in the stratosphere by nuclear reactions of atmospheric nitrogen with thermal neutrons produced naturally by cosmic rays (with the highest production rate 10 to 13 miles above Earth's poles), as well as by atmospheric nuclear weapons testing in the 1950s and '60s.

Hence, option D is correct

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Answer:

Methylamine

Explanation:

First count how many carbons there are (there's one). This will give the prefix meth-

Next we can see that this is in the organic functional group amine, as it has a nitrogen at the end with no oxygens. This will give it the suffix -amine.

Now we can give this compound a name:

Methylamine

(the yl is a suffix to make the meth- prefix complete)

Answer:

1.b

2.b

3.a

4.a

Explanation:

use the rate laws when answering this.

Answer:

[tex]\displaystyle \text{p} K_a \approx 3.856[/tex]

Explanation:

Because 3.005 grams of potassium lactate is added to 100. mL of solution, its concentration is:

[tex]\displaystyle \begin{aligned} \left[ \text{KC$_3$H_$_5$O$_3$}\right] & = \frac{3.005\text{ g KC$_3$H_$_5$O$_3$}}{100.\text{ mL}} \cdot \frac{1\text{ mol KC$_3$H_$_5$O$_3$}}{128.17 \text{ g KC$_3$H_$_5$O$_3$}} \cdot \frac{1000\text{ mL}}{1\text{ L}} \\ \\ &= 0.234\text{ M}\end{aligned}[/tex]

By solubility rules, potassium is completely soluble, so the compound will dissociate completely into potassium and lactate ions. Therefore, [KC₃H₅O₃] = [C₃H₅O₃⁺]. Note that lactate is the conjugate base of lactic acid.

Recall the Henderson-Hasselbalch equation:

[tex]\displaystyle \begin{aligned}\text{pH} = \text{p}K_a + \log \frac{\left[\text{Base}\right]}{\left[\text{Acid}\right]} \end{aligned}[/tex]

[Base] = 0.234 M and [Acid] = 0.500 M. We are given that the resulting pH is 3.526. Substitute and solve for pKₐ:

[tex]\displaystyle \begin{aligned} (3.526) & = \text{p}K_a + \log \frac{(0.234)}{(0.500)} \\ \\ 3.526 & = \text{p}K_a + (-0.330) \\ \\ \text{p}K_a & = 3.856\end{aligned}[/tex]

In conclusion, the pKₐ value of lactic acid is about 3.856.

You could let the air out of the balloon while it is under the water with a container filled with water upside down over it. And measure the water displacement.

Answer:

When pressure increases, density increases.

When the pressure decreases, density decreases.

When density increases, pressure increases.

When density decreases, the pressure decreases.

Explanation:

The indivisibility of an atom was proved wrong and no longer accepted today.

An atom is a particle of matter that uniquely defines a chemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons.

The indivisibility of an atom was proved wrong: an atom can be further subdivided into protons, neutrons and electrons.

Hence, an atom is the smallest particle that takes part in chemical reactions.

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If [tex]Ca(OH)_2[/tex] completely dissociates in water, it means it is a dilute strong base.

A base is a substance that can neutralize the acid by reacting with hydrogen ions.

An acid is a substance that donates hydrogen ions and a base is a substance that accepts hydrogen ions.

Ca(OH)₂ does not have hydrogen ions to donate, but it can accept hydrogen ions to form H₂O according to this equation:

H⁺ + OH⁻ → H₂O.

Hence,  Ca(OH)₂ is a base.

A strong base is a base that dissociates completely into metallic and hydroxide ions in aqueous solutions, while a weak base dissociates partially.

Hence, Ca(OH)₂ is a strong base.

Dilute refers to a solution meaning that the substance is not pure and the concentration is low. Since the solution the Ca(OH)₂ is 0.02 M means that it is diluted.

Therefore, we have found that the description of 0.02 M Ca(OH)₂ is a dilute strong base.

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[tex]^{233}_{92}U\;\rightarrow\;^4_{2}He\;+\;^{229}_{90}Th[/tex] is the balanced equations for the following nuclear reactions.

A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products

Uranium-233 is produced by the neutron irradiation of thorium-232. When thorium-232 absorbs a neutron, it becomes thorium-233, which has a half-life of only 22 minutes.

Hence,  [tex]^{233}_{92}U\;\rightarrow\;^4_{2}He\;+\;^{229}_{90}Th[/tex] is the balanced equations for the following nuclear reactions.

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Answer:

you will not

Explanation:

the little subscript number just indicates how many of a certain atom is in a molecule... example H₂O... that little ₂ means that there are 2 hydrogen atoms in the water molecule.

there is an invisible ₁ on the O as well. H₂O₁ shows there is one oxygen atom in the water molecule, but we do not show the 1

Answer:

The little number you see to the right of the symbol for an element is called a subscript. That number indicates the number of atoms of that element present in the compound. When balancing an equation, you can change the coefficients but not the subscripts.

Answer: 341.6k

Explanation:

R= 0.0821

n= 0.46moles

v= 13.3L

p= 734mmhg = 734/760 = 0.97

[tex]T = \frac{p*v}{n*R}[/tex]

[tex]T = \frac{0.97*13.3}{0.46*0.0821}[/tex]

T= 341.6k

Answer:

10100101

Explanation:

this is for the other person alt.

The increase in volume shift the equilibrium towards making more moles of gas, decrease in volume shift the equilibrium towards producing fewer moles of gas.

The equilibrium of the gas is based on the pressure of the gas. With the increase in pressure, the equilibrium moves towards making fewer molecules of gas.

The gas equilibrium is proportional to the equilibrium K.

Increase in volume shift the equilibrium towards making more moles of gas, decrease in volume shift the equilibrium towards producing fewer moles of gas.

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