The km of an enzyme is 5. 0 mm. Calculate the substrate concentration when this enzyme operates at one‑quarter of its maximum rate.

Answer:

D

Explanation:

I have a crush on the same and I

Jar containing sulfur-30 will have least amount of sulfur.

Radioactivity of a substance decreases with increase in time indicating that they are inversely proportional.Among the different isotopes of sulfur mentioned ,sulfur-35 is most radioactive as it has half-life period of 87.5 days.

On the other hand, sulfur-30  is least radioactive as it has half-life period of 1.18 seconds, thus within 10 seconds the jar containing sulfur-30 will be  almost empty.

Therefore,the jar containing sulfur-30 will have least amount of sulfur after 10 seconds as it's half-life is least.

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By ideal gas approximation, the mass of the Argon gas in container "b" is 488.6 grams.

We need to know about the ideal gas theory to solve this problem. The ideal gas is assumed that there is no interaction between particles in a gas. It can be determined by the equation

P . V = n . R . T

where P is pressure, V is volume, n is the number of moles gas, R is the ideal gas constant (8.31 J/mol.K) and T is temperature.

From the question above, we know that

Molar mass N₂ = Mr N₂ = 28

Molar mass Ar = Mr Ar = 40

m1 = 69.8 gr

V1 = 4.9 V2

P1 = P2 = P

T1 = T2 = T

Approximate that the gas is ideal, hence the ratio is

P1 . V1 / (n1 . R . T1) = P2 . V2 / (n2 . R . T2)

P . V1 / (m1/MrN₂ . R . T) = P . 4.9V1 / (m2/MrAr . R . T)

Mr N₂ / 69.8 = 4.9 . MrAr / m2

28 / 69.8 = 4.9 . 40 / m2

m2 = 488.6 grams

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10.81 mole of calcium chloride (CaCl2) does a town use daily if it uses 1.2 metric tons a day mole is a standard scientific unit for the calculation of large amounts of very small entities

Here given data is 1 metric ton = 1000 kilograms then 1.2 metric tons = 1200 kilogram then we have to find moles of calcium chloride (CaCl₂) =?

Then here concept are moles, molar mass of a substance is the mass in grams of one mole of that substance

Here given molar mass of (CaCl₂) = 110.98

So, given molar mass of calcium chloride (CaCl₂) / 1200

n = 1200/110.98 = 10.81 mole

So, 10.81 mole of calcium chloride (CaCl2) does a town use daily if it uses 1.2 metric tons a day

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The mole fraction of benzoic acid in the solution is 0.855.

What is benzoic acid?

Benzoic acid is a white solid which is a carboxylic acid based on benzene.

The vapor pressure of the benzoic acid solution and the mole fraction of the solute are directly proportional to each other i.e.

Pt = x P°s

Here t = total pressure

s = solvent

Given:

Vapor pressure of diethyl ether = 400.0 torr

Vapor pressure of the solution = 342 torr

Now substituting the values in the formula

342 =   x 400

= 342 / 400

 = 0.855

Thus, the mole fraction of benzoic acid is 0.855

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The property that causes the zinc shavings to react faster than the chunk of zinc is called the surface area.

The surface area is a crucial factor to consider while conducting any kind of chemical reaction because it considerably affects the reaction's rate. As surface area is reduced, response rates accelerate.

A chunk of zinc is like a body of stone kept together by strong bonding when contrasted to zinc shavings, which are zinc particles with lower surface areas.

The zinc shavings' reactive surface area is smaller than that of the enormous zinc chunk. Due to their reduced surface areas, reactants must be in close proximity to the acid solution for the reaction to take place.

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12.5 mL of 0.400M solution of HCL has the same number of moles of HCL as 25.0 ml of 0.200m solution of HCL.

A unit of measurement for substance amount is the mole. We have a reliable way to translate between atoms/molecules and grams by moles. Molecules can be expressed in terms of volume, the number of atoms or molecules, and molecular mass. A pure material has a molecular mass in grams that are equivalent to 1 mole of that substance.

Multiplying the volume in L by the molarity in mol/L gives moles of HCL

25.0 mL(1L/1000 mL)(0.200mol HCL/1L)

=0.00500 mol HCL in the solution.

For each answer choice, perform the same calculation to identify the correct match.

12.5mL(1L/1000mL)(0.400 mol HCL/1L)

=0.00500 mol HCL

The correct answer is 12.5mL of 0.400M solution of HCL.

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An object that sinks in water is more dense than the one which floats on it. The slope on a graph can determine the density of these objects.

For an identical size object, a dense object weighs more than a less dense one. A substance that is less dense than water will float on it; a substance that is denser will sink. Density equals mass per unit volume, or D = M / V, is the density equation.

The density of a substance can be determined by dividing its mass by its volume. Mass is on the y-axis and volume is on the x-axis in a graph of mass against volume. By calculating the slope, which is the change in y divided by the change in x, you may use this sort of graph to compute density.

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An azeotrope is a composition that has the similar components in the liquid phase as compared to the gas phase . therefore, an azeotropic compositions cannot be separated by distillation.

It is not separated by the distillation or fractional process due to the reason of the when the azeotrope mixture is boiled, the gaseous vapor has the similar proportions of constituents or the components as the unboiled mixture.

It can only be separated by azeotropic distillations. This method is also well known by the AD process.

It is a method to break the azeotropes with the help of various mixture of solvent , or separating agent it forms heterogeneous azeotropes.

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A large class of heterocyclic aromatic organic compounds are descended from oxazole. These are azoles, which have one carbon between the oxygen and the nitrogen.

Although less aromatic than thiazoles, oxazole are nonetheless compounds. Since imidazole’s conjugate acid has a pKa of 7, oxazole’s conjugate acid has a pKa of 0.8.

In this study, the most recent research and discoveries on the full spectrum of oxazole compounds as pharmaceuticals—including those with antimicrobial, antifungal, antiviral, antitubercular, anticancer, anti-inflammatory and analgesic properties—were carefully examined.

Because nitrogen is more basic than oxygen, protonation occurs at the sp2 orbital of nitrogen in oxazole. Oxazole’s oxygen atom reduces the

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The molecular formula of the compound is [tex]C_{4} H_{8}[/tex]

We can calculate the empirical formula from the carbon and hydrogen percentage by assuming that we have 100 g of the substance:
carbon: 85.63 g / 12 g/mol = 7.1358 mol
hydrogen: 14.37 g / 1 g/mol = 14.37 mol
We divide the moles with the smallest amount to get a mole ratio:
7.1358 mol / 7.1358 mol = 1
14.37 mol / 7.1358 mol = 2.01
So the empirical formula is [tex]CH_{2}[/tex], with the molar mass of 12 + 2 * 1 = 14 g/mol.
We can calculate the molar mass of the compound using ideal gas laws. At STP, 1 mol of any gas has a volume of 22.4 L, so:
1 mol : 22.4 L = X : 0.255 L
X = 1 mol * 0.255 L / 22.4 L = 0.0114 mol
From this, we calculate the molar mass of the gas:
0.0114 mol : 0.646 g = 1 mol : X
X = 0.646 g * 1 mol / 0.0114 mol = 56.67 g/mol
To get the molecular formula, we divide the molar mass of the gas by the molar mass of the empirical formula:
56 g/mol / 14 g/mol = 4
So now we multiply the empirical formula by 4 to get the molecular formula:
[tex]C_{4} H_{8}[/tex]

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Number of moles of sodium nitride, NaN₃ needed to produce 3.94 moles of Nitrogen, N₂ is 2.63 moles

Decomposition of sodium nitride is

NaN₃ → Na + N₂

On balancing the given reaction we need to add the necessary coefficients behind the reactants and products

2NaN₃ → 2Na + 3N₂

So, 2 moles of NaN₃  is needed to form = 3 moles of N₂

or 3 moles of N₂ is produced from = 2 moles of NaN₃

1 mole of N₂ is produced from = 2/3 moles of NaN₃

3.94 moles of N₂ of produced from = 3.94 x 2/3 moles of NaN₃

                                                            = 2.63 moles of NaN₃

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1. Grab a couple of lemons!

2. Baking Powder.

3. Colored food.

4. Dawn Dishwashing Soap

5. Tray, plate, or bowl

6. Sticks for making crafts.

7. Juice of lemon

Just as height and breadth are ways to express size, volume is a measure of an object's size.

The area occupied by gaseous particles under normal temperature and pressure circumstances is referred to as the volume of gas. It is identified as a "V. The letter "L" stands for "liters," the SI unit of volume. At normal temperature, a mole of gas has a volume of 24 m3, or 24 000 cm3. The molar volume of a gas is the name given to this quantity. For instance, the formula for calculating the volume of 40 moles of gas at a temperature of 250 K and a pressure of 1013 hPa is V = nRT/p = 40 * 8.31446261815324.

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Answer:

Reduce emissions, make clean energy, stop pollution, drive electric vehicles, and reduce meat consumption

Explanation:

Answer:

1. Save energy at home (heating, electricity)

2. Try walking, biking or taking public transport instead of going in a car or own vehicle

3. Don't waste food

4. Eat more vegetables

5. Try to travel without going on an airplane

To find the empirical formula from a molecular formula, you should divide the Subscripts by the Some integer in order to get the smallest whole number.

Part-A

The empirical formula of [tex]Al_{2}Br_{6}[/tex]is [tex]AlBr_{3}[/tex], we get it by dividing both subscript (i.e. 2&6) by 2.

Part-B

The empirical formula of C8H10 is

Simplest ratio of CH = 8:10 = 4:5

Hence, empirical formula =C4H5

Part-C

The empirical formula of C4H8O2 is C2H4O, we get it by diving all subscripts [tex]\frac{4}{2} : \frac{8}{2} :\frac{2}{2}=2:4:1[/tex] by 2.

Part- D

molecular formula= P4O10

simplest ratio of

[tex]\frac{P}{O}= \frac{2}{5} \\ empirical formula = p_{2}O_{5}[/tex]

Part -E

The empirical formula of C6H9CL2 is C3H2CL,we get it by diving all subscripts[tex]\frac{6}{2}:\frac{4}{2}:\frac{2}{1} =3:2:1[/tex] by 2

Part-F

The empirical formula of B3N3H6is BNH2, we get it by diving all subscripts [tex]\frac{3}{3} :\frac{3}{3} :\frac{6}{3} = 1:2:3[/tex] by 2.

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The physical properties of elements in the periodic table varies as follows;

The Periodic table is a table which arranges elements based on their increasing atomic number into vertical columns called groups and horizontal rows known as periods.

The physical properties of the periodic table refers to the properties in of the elements in the periodic table which vary in a regular pattern both down the groups and across the periods.

Some physical properties of the periodic table are as given below:

Melting and boiling point: the melting and boiling point of the metallic elements in the period table increases on going from left to to right across the period and decreases on going down the group. For non-metallic elements, the melting and boiling point decreases on going from left to to right across the period and increases on going down the group

Atomic size: the atomic size of the elements decrease across a period from left to right, but increases on going down the group.

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Four molecules of HCl are needed to produce four molecules of H₂O.

The number of molecules of of HCl needed to produce four molecules of H₂O is determined from the mole ratio of the reaction as given in the equation of the reaction below:

2 HCl (aq) + Ca(OH)₂ (aq) → CaCl₂ (aq) + 2 H₂O (l)

The mole ratio of the reaction as given in the equation shows that 2 moles of HCl produces 2 moles of water.

Therefore, the mole ratio  of HCl and H₂O is 1 : 1

Four moles of H₂O will be produced by four molecules of HCl

The number of molecules of HCl in 1 mole of HCl is 6.02 * 10²³ molecules.

1 mole of every substance contains equal number of particles.

Hence, 1 mole of water will contain  6.02 * 10²³ molecules.

Based on the mole ratio of the reaction, four molecules of HCl are needed to produce four molecules of H₂O.

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He decided not to dry his glassware throughout the calibration lab.

Instead, he shook leftover water out of his Erlenmeyer flask by the

wrist action.

This is an example of a random error.

Random errors also referred to as human error, depending on how well the experimenter is able to conduct the experiment and interpret the data.

Since the results could be either too high or too low, these errors are random.

Random error frequently determines or limits the experiment's precision.

For instance, the random error would be the reaction time if we were timing the revolution of a turntable that was rotating steadily.

A delay in the beginning (an underestimation of the actual result) or a delay in ending would cause a variation in our reaction time (an overestimation of the actual result).

Random errors differ from systematic errors in both magnitude and direction.

However, the average of a set of measured positions can be calculated, and that average is probably more accurate than the majority of the measurements.

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This is an example of a random error.

The term "random error" describes errors that happen when the conditions under which an experiment is conducted change.

A chance discrepancy between an object's true and observed values is known as a random error.

Chance is the cause of the random error.

When the same weight is placed on an electronic scale multiple times, the readings can vary randomly from one reading to the next. This is an example of a random error.

These discrepancies between the readings and the actual weight are due to random errors in the scale's weight measurements.

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Regina conducted an investigation to determine whether earthworms add nutrients to soil. she used two pots of soil. she added three earthworms to the first pot. she did not add any earthworms to the second pot, which was the control. Regina tested the nutrient levels of the soil in both pots after two weeks. The type of investigation is Regina conducting is experimental.

Experimental study is a quantitative method of research which allows to visualize the effects of variable change by keeping other variables in control. These involve random experimental control.

There is an independent variable, a dependent variable and a set up which is meant for control in an experimental study. The control is to establish the validity of the experimental study.

Experiments creates the cause and effect relationship. This experiment was designed to know whether the earthworms add any nutrient to the soil.

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56 ml of water is displaced on submerging a book having volume of 56 cm³.

If a body is considered which is completely submerged, the volume which it will displace will be equal to volume of the body.If it is partially submerged,volume of fluid displaced will be equal to the volume of the part which is submerged.This is in accordance with the Archimedes' principle.

The Archimedes' principle can be stated as the upward buoyant force which is exerted on a body irrespective whether the body is partially or fully submerged  is equal to the weight of fluid which is displaced by it.

Thus,56 cm³ of water will be displaced on submerging the book into water as the book will be completely submerged.

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Answer:

Atoms are made up of a nucleus, protons and electrons

The empty glassware might heat quickly, igniting vapors from the distillation is the concerns presented by overheating a distillation to a dry flask.

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After one week he counts the number of scratches on the floor it is the independent variable.

An independent variable is one whose values are altered by the researcher to achieve the desired results.

The variable is known as the dependent variable when its values change in response to changes in the independent variable's values.

The dependent variable serves as the experiment measure while the independent variable controls the experiment.

The dependent variable is an effect of the independent variable, which is a cause.

In a linear regression, we can state that "y" stands for the dependent variable and "x" for the independent variable.

While the dependent indicates the influence of changes in the independent variable, the independent depends on nothing.

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After losing credibility throughout the jackson case trial. To show that only the body is failing, Gettler underwent a number of cyanide tests.

He identified cyanide poisoning as the cause of death using chemical analyses.

He examined techniques for identifying human body decomposition by  wood alcohol.

He identified cyanide poisoning as the cause of death using chemical analyses.

When arsenic was utilized as a toxin, the Marsh test, a very sensitive method for finding arsenic, is particularly helpful in the field of forensic toxicology. James Marsh, a chemist, created it, and it was first printed in 1836.

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Element of first triads with similar properties are : calcium , strontium and barium are in increasing order of atomic mass.

A triad is a grouping of three elements organized according to increase in atomic mass.

Dobereiner stated his law of triad as  : " airthmatic mean of atomic masses of first and third element would be equal to atomic mass of second element".

The first triad of dobereiner was introduced as : calcium , strontium  and barium.

In this triad, the airthmatic mean of calcium and barium is exactly same as that of strontium.

therefore , according to this the properties of middle element lie in between first and third element.

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Answer:

Identified triads of elements with similar properties:

✔ Dobereiner

Organized elements according to increasing atomic mass:

✔ Mendeleev

Explanation:

Ed22

Answer:

How do you identify an unknown white powder?

Not only can Raman spectroscopy be used to identify unknown white powders rapidly, it can also be used to identify explosives (Figure 3) and other biochemical agents such as anthrax and mustard gas

Explanation:

Answer:

the option will be no.3

Explanation:

why? because I said so

Johnny's percentage error is calculated as= 41%

The quantity of carbon Johnny should have (actual value) = 21.8 g

The quantity of carbon Johnny was able to calculate = 22.7 g

To calculate the percentage error, subtract the actual value from the estimated value. That is,

22.7 - 21.8 g = 0.9 g

This error value obtained is divided by the actual value ( 21.8 g)

0.9 / 21.8 = 0.41

Then multiply by 100%

0.41 × 100.= 41%

Therefore, Johnny's percentage error is calculated as = 41 %

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