Explain how Mendeleev was able to predict the properties of undiscovered elements. Check all possible answers.​

The number of moles of CO2 produced is 0.021 moles

If the estimated volume of the balloon is wrong then the amount of glucose reacted must be more than is stated.

The respiration equation represents the chemical process of aerobic cellular respiration, which occurs in the mitochondria of cells and is the primary way in which cells generate energy in the form of ATP (adenosine triphosphate).

The equation of the reaction is;

C6H12O6 + 6O2 → 6CO2 + 6H2O + ATP

We know that;

Number of moles of glucose = 10 g/180 g/mol

= 0.056 moles

PV = nRT

n = PV/RT

n = 1 * 0.55/318 * 0.082

n = 0.021

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The activation energy of this reaction is approximately -13.770 J/mol.

1. To graphically determine the activation energy, we need to plot two points. The given data points are:

  Point 1: (1, -1.275)

  Point 2: (2, 0.379725)

2. The rise is the change in the y-coordinate between the two points:

  Rise = y2 - y1 = 0.379725 - (-1.275) = 1.654725

3. The run is the change in the x-coordinate between the two points:

  Run = x2 - x1 = 2 - 1 = 1

4. The slope of the line formed by these two points can be calculated using the formula:

  Slope = rise / run = 1.654725 / 1 = 1.654725

5. The activation energy (Ea) can be determined using the equation:

  Ea = -R * slope

 Here, R is the ideal gas constant, which is approximately 8.314 J/(mol·K).

6. Plugging in the values:

  Ea = -8.314 * 1.654725 = -13.770 J/mol

Note that the activation energy is negative because it represents the energy difference between the reactants and the transition state (higher energy) in an exothermic reaction.

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The moles of NaOH used is 0.0008 moles

The molarity of the acid  is 0.008 M

The molarity of the acid is found as follows:

Moles of NaOH used = concentration of NaOH × volume of NaOH used

the average volume of NaOH used = 8.0 mL

moles of NaOH = 0.1 M × 8.0 mL

moles of NaOH = 0.0008 moles

Molarity of acid:

Assuming the acid is monobasic, the mole ratio of acid to base is 1 : 1

The volume of acid used is 100 mL

The molarity of acid = moles of acid / volume of acid in liters

The molarity of acid = 0.0008 moles / 0.1 L

The molarity of acid  = 0.008 M

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In part A, The liquid in test tube #2 was Catalase. So option D is correct.

In part B,  The new foaming is evidence of which of the claim that the Catalase was still present in the liver tissue because the enzyme was not used up as a reactant in the chemical reaction. So option B is correct.

Catalase can be described as an enzyme that will catalyze the reaction that breaks down hydrogen peroxide into oxygen and water.

Hydrogen peroxide is a strong compound that has the function of protecting microorganisms but due to its toxicity it must be transformed into less dangerous products, so catalase is vital as it breaks it down into oxygen and water.

We can confirm that the liquid in test tube #2 was catalase because it will break down hydrogen peroxide into water and oxygen so it will not react with the liver.

The new foaming is evidence of which of the claim that the Catalase was still present in the liver tissue because the enzyme was not used up as a reactant in the chemical reaction.

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Answer:

The result is that you have a solution, which is a homogeneous mixture, which means that the solution is uniform throughout.

Explanation:

Answer:

A. 40.0%

Explanation: Divide 8/20=0.4 Move the decimal twice to the right BAM! you got 40%.

What is formed is a single covalent bond because each atom requires one more electron to complete its octet.

Let us recall that a bond is formed between two atoms when we have to atoms bonded together, the atoms are connected by means of a chemical bond. There are different kinds of bonds that are used to connect atoms together such as;

When we talk about a diatomic molecule, we are talking about a molecule that is composed of two atoms that are exactly the same. This implies that the electronegativities of the atoms must be the same and the bond that is formed would be a nonpolar covalent bond. There are so many of such kinds of molecule that we have in chemistry such as the oxygen molecule, the hydrogen molecule, the fluorine molecule and so on.

Thus, given that diatomic molecule shares a single pair of electrons, we can say that this is a single covalent bond because each atom requires one more electron to complete its octet.

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The wavelength (in nanometers) of a photon emitted by a hydrogen atom when its electron drops from the n = 5 to n = 3 state is 1280nm.

The distance between two subsequent crests or troughs of the wave is what is meant by the term wavelength. Lambda () is a Greek letter that stands for wavelength.

The wavelength is the distance between one wave's "crest" to another wave's "crest." We can calculate the wavelength by comparing the "trough" of one wave to the "trough" of another wave.

These are the calculations for the energy (E) difference between two shells:

ΔE = -RH [(1 / nf2) - (1/ni2)] ΔE

R Rydberg’s constant (1.0973731568539(55)×107m−1)

nf and ni Integers where n2>n1.

ΔE = -RH [(1 / nf2) - (1/ni2)] ΔE

= -2.18 x10-18 J [(1/32) - (1/52)] ΔE

= -1.55 x10-19 JE

hc/λλ = hc/Eλ

where

λ =The wavelength of the photon.

hc/λλ = hc/Eλ

= [(6.63 x10-34 J.s.) x (3.00 x1017 nm/s)] /(1.55 x10-19 J)

λ = 1280nm

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The growth of the new plant depicts the asexual reproduction characteristic. The characteristic that describes the growth of the new plant in Stephan's mother cutting a twig from a rose bush and planting it in the soil is asexual reproduction.

Asexual reproduction is the mode of reproduction by which organisms generate offspring that are identical to the parent's without the fusion of gametes. Asexual reproduction is a type of reproduction in which the offspring is produced from a single parent.

The offspring created are clones of the parent plant, meaning they are identical to the parent.The new plant in Stephan’s mother cutting a twig from a rose bush and planting it in the soil depicts the process of asexual reproduction, which is the ability of a plant to reproduce without seeds. In asexual reproduction, plants can reproduce vegetatively by cloning themselves using their roots, bulbs, or stems.

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Answer:

Following are the solution to the given question:

Explanation:

Please find the ionic compound in the solution file:

Following are the three functional groups which affected by pH:  

Answer:

180 degrees

Explanation:

sp hybridization generates orbitals that overlap linearly, generating a straight line. This leads to an angle measurement of 180 degrees.

Engine oil can be divided into four fundamental assortments - manufactured oil, manufactured mix oils, high mileage oil, and ordinary engine oil.

While there are a few variables in looking at engineered versus customary oil and manufactured mix versus full engineered, there are one-of-a-kind qualities and details to assist you with figuring out which oil is the best fit for your vehicle.

Manufactured engine oil has gone through a synthetically designed process. Engineered soil particles are more uniform in shape with fewer contaminations and preferred properties over ordinary oil atoms. By and large, engineered oil has better outrageous high-temperature and low-temperature execution. Manufactured oils are for the most part figured out with higher-performing added substances. High-mileage engine oil is uncommonly planned for late-model vehicles or more up-to-date vehicles with north of 75,000 miles. High mileage engine oil, with its special added substances and detailing, assists with lessening oil consume off and forestalls oil releases that might happen in more seasoned motors. Pennzoil sells numerous sorts of high-mileage engine oil, like Pennzoil Platinum® High Mileage Full Manufactured Engine Oil and Pennzoil® High Mileage Engine Oil.

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Answer: weathering

Explanation: It is slowly by wind or by water

ANSWER

The number of moles of oxygen gas is 0.038 mol

EXPLANATION

Given that;

The volume of oxygen gas is 650mL

The pressure of the oxygen gas is 1400 torr

The temperature of the oxygen gas is 385K

Follow the steps below to find the number of moles of oxygen gas

Step 1; Assume the gas is an ideal gas

The ideal gas equation is given below

Where

P is the pressure

V is the volume

n is the number of moles

R is the universal gas constant

T is the temperature of the gas

Step 2; Convert the volume to Liters

Let x represents the volume of gas in liters

Step 3; Substitute the given data into the formula in step 1

Therefore, the number of moles of oxygen gas is 0.038 mol

Answer:

A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change.

The second time David build a neutron gun he used radium and thorium instead of aluminum.

David was a young boy who decided to build a neutron gun. His story is described in the text "The Radioactive Boy Scout".

David had in mind the idea of building a neutron gun for this he needed radioactive elements such as radium and thorium, which he obtained by deceiving the officials of the Nuclear Regulatory Commission. This was a very dangerous experiment as radioactive elements are a great danger for health.

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Answer:

As we have already discussed, reactivity of alkali metals tends to increase as you go down the group. Therefore, sodium is less reactive with water than is potassium, likewise with the alkaline metals; calcium is more reactive than magnesium

i hope this calculation will help you  

The  ions has the noble - gas electron arrangement. The following ions has a noble gas electron arrangement is Ti⁴⁺ .

The atomic number of the titanium is 22. The symbol of the titanium is Ti.

The electronic configuration of Ti is as follows :

Electronic configuration : 1s² 2s² 2p⁶ 3s² 3p⁶ 3d² 4s² or [Ar] 3d² 4s²

The Ti⁴⁺ means the titanium losses the four electrons and form the positively charged ion called as cation.

The electronic configuration of Ti⁴⁺ is as follows :

Electronic configuration : 1s² 2s² 2p⁶ 3s² 3p⁶ or [Ar]

Thus, the Ti⁴⁺  ions has a noble gas electron arrangement.

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Answer:

Explanation:

\(\text{From the information given:}\)

\(\text{The chemical reaction is : } 4 KClO_{3(s)} \to 3 KClO_{4(s)} + KCl_{(s)}\)

\(\text{To find} \ \Delta G^0_{rxn}\ \text{using the formula}: \\ \\ \Delta G^0_{rxn} = \sum n_p \times \Delta _f G^0 (Products) - \sum n_R \times \Delta _fG^0 ( Reactants) \\ \\ where; n_p = \text{no of moles of products } \ and; \\ \\ n_R = \text{no of moles of reactants }\)

\(\implies G^0_{rxn} = 3 \times \Delta _fG^0 [KClO_4{(s)}] + \Delta_fG^0[KCl_{(s)}] - 4 \times \Delta _f G^0 [ KClO_3 (s) ]\)

\(\Delta _fG^0 \ values \ at \ 25^0 \ C (298 \ K) are\ given \ as:\\\\ \Delta _fG^0 [KClO_4(s)] = -303.09 \ kJ \\ \\ \Delta _fG^0 [KCl(s) ] = - 409.14 \ kJ \\ \\ \Delta_f G^0 [KClO_3_{(s)}] = -296.25 \ kJ \\ \\ replacing \ the \ above \ values \ into \ equation (1) ; then:\\ \\ \\\Delta G^0_{rxn} = 3 *(-303.09) + (-409.14) - 4*(-296.25) \ kJ \\ \\ = (-909.27 - 409.14 + 1185) \ kJ \\ \\ = -133.41 \ kJ \\ \\ \mathbf{\Delta G^0_{rxn} = -133.4 \ kJ }\)

The standard free energy change of the reaction is -133 kJ.

From the reaction equation, we have; 4KClO3 ⇄ 3KClO4 (s) + KCl (s). The standard free energy of formation of each specie is given below;

ΔG°f KClO3 = -296.35 kJ

ΔG°f KClO4 = -303.09 kJ

ΔG°f KCl = -409.14 kJ

Hence;

ΔG°rxn = [3(-303.09)] + ( -409.14)] - [(4( -296.35))]

ΔG°rxn = (-909.27) + (-409.14) - (-1185.4)

ΔG°rxn = -133 kJ

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The enzymes invertase and zymase, which are produced by Saccharomyces cerevisiae, are in charge of the alcoholic fermentation of sucrose, which generates ethanol and CO2.

The transformation of sugar into ethanol and carbon dioxide is catalyzed by an enzyme complex known as zymase. It is naturally found in yeast. Zymase activity varies across yeast strains.

Glucoseamylase enzymes convert the flour's starch into maltose and fermentable sugars. The dough rises as a result of the yeast fermentation process. Moreover, these enzymes are used to create glucose, which Saccharomyces cerevisiae then ferments to produce ethanol.

The typical temperature for this to happen is around 30°C. Sugar produced from plants is a renewable resource.

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The replacement reaction will not occur because iodine is less reactive than chlorine.

A replacement reaction is a type of reaction in which one element is replaced by another in a compound.

The principle behind one element replacing the other is based on the reactivity of an element. A more reactive element will displace a less reactive one.

According to this question, the following displacement reaction is given: MgCl2 + I2 → ?

This reaction will not occur because chlorine is more reactive/electronegative than iodine, hence, iodine cannot displace it.

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Answer:

8,15 and 45 respectively

Explanation:

let x be the second number

x-7 = the first number

3x= the third number

x-7+x+3x=68

5x-7=68+7

5x=68+7

5x=75

divide both side by 5

x=15

Answer:

1. Conduction

2. Convection

Explanation:

1. Conduction is the transfer of energy from one end of something to the other. Since the pad is heating up your back and no fluids or gasses are involved it is conduction.

2. Convection is the transfer of energy through air. Since the air is transferring its energy to the ice it is convection.  

Answer:it is 3 just look at the middle numbers

Explanation:

Global warming brought on by rising carbon dioxide concentrations in the atmosphere is changing weather patterns and ocean temperatures. Changes in precipitation patterns are being brought on by the warming of the atmosphere.

Because it is one of the gases in the atmosphere that causes the greenhouse effect, which causes the Earth to warm, carbon dioxide is known as a greenhouse gas. Long-wavelength infrared radiation (heat) from the Earth is absorbed by carbon dioxide molecules in the atmosphere, and some of it is then radiated back downward.

Similarly, as air temperatures rise in response to rising carbon dioxide concentrations, more water vapor escapes into  the atmosphere—which then amplifies greenhouse heating

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The dissociation of cadmium chloride is as follows: CdCl₂(s) → Cd⁺²(aq) + 2Cl⁻(aq)

Dissociation is the process by which a compound body breaks up into simpler constituents; said particularly of the action of heat on gaseous or volatile substances.

It is a chemical reaction in which a compound breaks apart into two or more components. The general formula for a dissociation reaction follows the form:

AB → A + B

According to this question, cadmium chloride undergoes dissociation into cadmium and chlorine ions as follows:

CdCl₂(s) → Cd⁺²(aq) + 2Cl⁻(aq)

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