a piece of metal has a mass of 1.3 g/cm and a has a volume of 24.9 cm3 what is its mass

Regarding the location of the double bond that takes priority in the provided structure, it is 3 - bromo - 1 - chlorocyclohex - 1 -ene. In short, the name of the compound is written out first.

Followed by the base name (which is derived from the number of carbons in the parent chain) and the substituents in alphabetical order. Between numbers and letters are separated by dashes and commas, respectively. The name has no spaces. The International Union of Pure and Applied Chemistry (IUPAC) recommends using the IUPAC nomenclature of organic chemistry when naming organic chemical compounds in chemical nomenclature.

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0.3 moles of N2 will produce (2/1) × 0.3 = 0.6 moles of NH3.Using molar mass, the mass of NH3 is:molar mass of NH3 = 17 g/molMass of NH3 = Number of moles of NH3 × Molar mass of NH3= 0.6 × 17= 10.2 gTherefore, the mass of NH3 formed is 10.2 g.Answer: d) 10.2 g

The balanced chemical equation is:N2 + 3H2 → 2NH3Molar mass of N2 = 14 + 14 = 28 g/molMolar mass of H2 = 1 + 1 = 2 g/molMolar mass of NH3 = 14 + 3 = 17 g/molThe reaction of 0.3 moles of N2 with 0.6 moles of H2 to form NH3 is given below:N2 + 3H2 → 2NH3First we have to see the limiting reagent:The molar ratio of N2 and H2 is 1:3If 0.3 moles of N2 is used, then the number of moles of H2 required will be:3 × 0.3 = 0.9 molSince we have 0.6 moles of H2, N2 is the limiting reagent.Now, we will use the limiting reagent to calculate the number of moles of NH3 formed.Using stoichiometry,1 mole of N2 produces 2 moles of NH3. Therefore, 0.3 moles of N2 will produce (2/1) × 0.3 = 0.6 moles of NH3.Using molar mass, the mass of NH3 is:molar mass of NH3 = 17 g/molMass of NH3 = Number of moles of NH3 × Molar mass of NH3= 0.6 × 17= 10.2 gTherefore, the mass of NH3 formed is 10.2 g.Answer: d) 10.2 g

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Answer:What is used up in and stops a chemical reaction? (a) percent yield (b) limiting reactant (c) theoretical yield (d) excess reactant

The correct option is (b)

Explanation:

A chemical reaction is a chemical combination,rearrangement or disintegration of chemical substance(s) (called reactants) to form new chemical substance(s) (called products).

A limiting reactant is the reactant that is totally used up during the course of a reaction. When this reactant is used up, it limits the amount of products formed and eventually stops the chemical reaction.

Explanation:

The limiting reagent is the reactant that is used up completely. This stops the reaction and no further products are made. ... This method is most useful when there are only two reactants. The limiting reagent can also be derived by comparing the amount of products that can be formed from each reactant.

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it is A it got to be A)-4k

Explanation:

The enthalpy change(δH) for the reaction at -79.0 °C is -769.98 kJ.

To solve this problem, we will use the following equation:

ΔH = ΔH° + CpΔT

where ΔH is the enthalpy change at the new temperature,

ΔH° is the enthalpy change at the standard temperature (in this case, 164.4 °C),

Cp is the heat capacity of the system,

ΔT is the difference in temperature.

δH = -833.32 kJ = -833,320 J
δH° = 866.05 J/K

Calculating the heat capacity, Cp:

Cp = (ΔH - ΔH°) / ΔT

Cp = (-833,320 J - 866.05 J/K x 164.4 K) / (164.4 - (-79.0)K)

Cp = -834,186.58 J/K

Use the same equation to find the enthalpy change at the new temperature:

ΔH = ΔH° + CpΔT

ΔH = -833,320 J + (-834,186.58 J/K x (-79.0 - 164.4))

ΔH = -769,982.69 J

Convert this value back to the original units:

δ = ΔH / 1000 = -769.98 kJ

Therefore, the reaction's enthalpy change at -79.0 °C is -769.98 kJ.

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Answer:

yes

Explanation:

Answer:

Alpha is the most harmful, Gamma is the least harmful.

Explanation:

From skimming over your answer I have noticed this mistake. You are correct in saying alpha is the least penetrating but incorrect in saying alpha is the least ionising. Same for Gamma.

Answer:

To calculate the mass of the sample, we can use the formula:

mass = density x volume

Given that the density of pure silicon is 2.34 g/cm^3 and the volume is 450 mL, we can plug in these values:

mass = 2.34 g/cm^3 x 450 mL

Before we can multiply, we need to convert mL to cm^3 since the units need to match:

1 mL = 1 cm^3

So:

mass = 2.34 g/cm^3 x 450 cm^3

Now we can multiply:

mass = 1053 g

Therefore, the mass of the sample of pure silicon is 1.053 x 10^3 g, or 1.053 kg, with three significant figures.

Explanation:

The correlation coefficient is a number between zero and 1 and the answer is false

And that is because the correlation coefficient is a number between -1 and one. A positive correlation coefficient means that two variables are positively correlated or move in the same direction. Plus one means perfect like full correlation, zero means there is no correlation whatsoever.

And a negative correlation means that as one variable moves in a positive direction, the other moves in a negative direction, so that is negative correlation, And the correlation of -1 means perfect negative correlation.

The correlation coefficient is a statistical measure of the strength of the relationship between the relative movements of two variables. The values range between -1.0 and 1.0. A calculated number greater than 1.0 or less than -1.0 means that there was an error in the correlation measurement.

A correlation of -1.0 shows a perfect negative correlation, while a correlation of 1.0 shows a perfect positive correlation. A correlation of 0.0 shows no linear relationship between the movement of the two variables.

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Answer:

20

Explanation:

Answer:

Glucose

Explanation:

glucose

During aerobic respiration, the oxygen taken in by a cell combines with glucose to produce energy in the form of Adenosine triphosphate (ATP), and the cell expels carbon dioxide and water. This is an oxidation reaction in which glucose is oxidized and oxygen is reduced.

The molecule which would have the highest boiling point is 2-methylhexane. Thus, the correct option will be D.

The boiling point is the temperature at which the vapor pressure of a liquid is equal to the external pressure. The boiling point of a liquid is a measure of its vapor pressure. The higher the boiling point, the higher the vapor pressure of the liquid, and the more heat is required to vaporize it.

The boiling point of a substance is affected by the strength and types of intermolecular forces. The stronger the intermolecular forces, the higher the boiling point. 2-methylhexane has highest boiling point because it has the highest number of carbons and branches, which contribute to its strong intermolecular forces that lead to a higher boiling point.

Therefore, the correct option is D.

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Answer:

The tannin level of the fruit is significant, making the unripe fruit astringent and bitter. As the fruit develops, the tannin content decreases.

Answer:4.7374*10^23 atoms

Explanation:

Number of atoms in 144.6g tungsten,

Moles=Given mass/molecular mass

n=144.6/183.84

n=0.7865

Number of atoms=n*Na

Number of atoms=0.7865*6.023*10^23

Number of atoms=4.7374*10^23

we can conclude that the scale is precise but not accurate. The correct option is d.This means that the scale consistently gives the same measurements, but they are not accurate or close to the true value.

To understand whether the scale is precise, accurate, both, or neither, we need to define these terms. Precision refers to the consistency or reproducibility of measurements, while accuracy refers to how close the measured value is to the true or accepted value. In this case, the true value is 1.000g, and the measurements captured are 0.843 g, 0.842 g, and 0.843 g.Looking at these measurements, we can see that they are not accurate since none of them are close to 1.000g. However, we can also see that they are precise since they are all very similar to each other, with a difference of only 0.001g between the highest and lowest measurement.
Therefore, To improve accuracy, the scale may need to be recalibrated or replaced.

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complete question: Testing precision and accuracy of scale, weigh block exactly 1.000g. these are measurements captured:

a. 0.843 g

b. 0.842 g

c. 0.843 g

d. Is the scale precise, accurate, both, or neither?

Answer:

B

Explanation:

Hypoesthesia reduces physical sensation, especially that of skin.

To solve this we must be knowing each and every concept related to hypesthesia. Therefore, the correct option is option B among all the given options.

Hypoesthesia is caused mostly by nerve injury and blood vessel blockages, which cause ischemia damage to tissues fed by the stopped blood vessels. This damage can be detected using several imaging investigations.

The most common causes of hypoesthesia are nerve blood and injury channel blockages, which induce ischemic damage to tissues nourished by the blocked blood arteries. Several imaging examinations can be used to discover this injury. Hypoesthesia diminishes physical experience, particularly cutaneous sensation.

Therefore, the correct option is option B.

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This isn't mine, but this is an urgent question so writing my own answer would be time consuming, so here's a non-plagiarised answer :

Community is much more than belonging to something. It's about doing something together that makes belonging matter. We also talk about being in community and having a sense of community or community spirit. This is what it means to be in a genuine community — a feeling of belonging, of togetherness.

This is a different perspective from someone else :

A community is a group of people who share something in common. You can define a community by the shared attributes of the people in it and/or by the strength of the connections among them. You need a bunch of people who are alike in some way, who feel some sense of belonging or interpersonal connection.

Answer:

bbbbbbbbbbbbb bbee been been been been been bbeen been been hereafter idskdhjsjahdh#इ ह्ज!उकालो ज्वाला

Mitosis is conventionally divided into 5 phases, which include prophase, prometaphase, metaphase, anaphase and telophase and cytokinesis.

Interphase

Before coming into mitosis, a mobile spends a length of its increase underneath interphase.

Prophase

Prophase straight away follows the S and G2 levels of the cycle and is marked by way of condensation of the genetic fabric to form compact mitotic chromosomes composed of  chromatids attached at the centromere.

Prometaphase

In the prometaphase, the nuclear envelop disintegrates. Now the microtubules are allowed to extend from the centromere to the chromosome.

Metaphase

At this level, the microtubules start pulling the chromosomes with equal pressure and the chromosome ends up in the center of the cell. This area is referred to as the metaphase plate.

Anaphase

The splitting of the sister chromatids marks the onset of anaphase. These sister chromatids end up the chromosome of the daughter nuclei.

Telophase

The chromosomes that cluster at the two poles start coalescing into an undifferentiated mass, because the nuclear envelope begins forming round it.

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Answer:

D) 0.9 L

Explanation:

At constant temperature,

PV = Constant

so,

P1.V1 = P2. V2

101 × 2.1 = 235 × V2

V2 = 0.9 L

Answer:

0.9L

Explanation:

Given parameters:

Initial volume = 2.1L

Initial pressure  = 101kPa

Final pressure  = 235kPa

Unknown:

Final volume  = ?

Solution:

The relationship is between pressure and volume. To solve this problem, we apply Boyle's law which states that "the volume of a fixed mass of a gas varies inversely as the pressure changes if the temperature is constant".

Mathematically;

        P₁V₁  = P₂V₂

P₁ is the initial pressure

V₁ is the initial volume

P₂ is the final pressure

V₂ is the final volume

 Now insert the parameters and solve;

        2.1 x 100 = 235 x V₂

            V₂ = 0.89L

Answer:

D

Explanation:

Density is d=m/v

We have mass, it's 540

The volume is length*width*height

So it's 5*6*4=120 cm^3

540/120=4.5 g/cm^3

It's cm^3 because volume is in cubic centimeters.

The volume of 15.8 M concentrated nitric acid required to completely react with 1.00 g of copper would be 0.004 L or 4 mL.

Concentrated nitric acid and copper react to produce hydrogen gas, nitrogen dioxide gas, and copper (II) nitrate according to the following equation:

\(Cu + 4HNO_3 --- > Cu(NO_3)_2 + 2H_2 +2NO_2\)

The mole ratio of copper the nitric acid is 1:4.

I g of copper is equivalent to:

mole = mass/molar mass

         = 1/64

          = 0.016 mol

The equivalent mol of the nitric acid would be: 0.016 x 4 = 0.064 mol

Recall that molarity is the ratio of the number of moles of solutes and the volume of the solution in liters.

Thus, volume = mole/molarity.

Volume of 0.064 mol nitric acid = 0.064/15.8

                                                     = 0.004 liters

0.004 liters = 4 mL

Thus, the volume of the concentrated nitric acid that will be required to completely react with 1.00 grams of copper would be 0.004 liters or 4 mL.

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The molar mass of insulin is approximately 0.798 g/mol, calculated using the equation for osmotic pressure and the given values of mass and volume.

To calculate the molar mass of insulin, we can use the equation for osmotic pressure:

π = (n/V)RT

where π is the osmotic pressure, n is the number of moles of solute, V is the volume of the solution in liters, R is the ideal gas constant, and T is the temperature in Kelvin.

First, convert the given values to appropriate units:

25.0 mg = 0.025 g
5.00 mL = 0.005 L

Next, rearrange the equation to solve for n (number of moles):

n = (πV) / (RT)

Substituting the given values:

n = (15.5 mmHg * 0.005 L) / ((0.0821 L·atm/(mol·K)) * 298 K)

Calculate n:

n ≈ 0.0313 mol

Finally, divide the mass of insulin (0.025 g) by the number of moles (0.0313 mol) to find the molar mass:

Molar mass = 0.025 g / 0.0313 mol

Molar mass ≈ 0.798 g/mol

So, the molar mass of insulin is approximately 0.798 g/mol.


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Explanation:

When the water evaporates from your clothes, it will "hang around" around it. If there is little or no air movement, this means that the air surrounding the fabric is saturated with moisture, which means it will not evaporate more. The breeze will move the moisture-saturated air away from the fabric, until more water evaporates.

To make an acetate buffer at ph 4.76 starting with 500 ml of 0.1 m sodium acetate (pk acetic acid = 4.76), you could add  0.025 mol

moles of sodium acetate = 0.1 M × 500 ml = 0.05 moles

volume = moles / concentration

volume = 0.05 moles / 0.1 M

volume = 0.5 L = 500 ml

( 0.1-x ) / x = 1

cross multiply

x = 0.05

x = 0.05 M

Concentration of sodium acetate = 0.1

0.1 - 0.05

= 0.05

= 0.05 M * 0.5L

= 0.025 mol

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The mass of Ce(NO3)₄ that will be needed to create the solution was 24.16 g (in grams).

A homogenous mixture with one or even more solutes that have been dissolved in the solvent is known as a solution. The material that a solute dissolves in to create a homogenous mixture is known as a solvent. To create a homogenous mixture, a component must dissolve in a solvent.

One nanometer or smaller particles are referred to as a solution in a homogeneous mixture made up of two or more components. There are many different types of solutions, including sugar and salt solutions and fizzy water. Each component shows up as a different phase in a solution.

Mole of Ce(NO₃)₄ = 0.06225 mole

Molar of Ce(NO₃)₄ = 140.12 + 4[14 + (16×3)]

= 140.12 + 4[14 + 48]

= 140.12 + 4[62]

= 140.12 + 248

= 388.12 g/mol

Mass of Ce(NO₃)₄ = 0.06225 × 388.12

Mass of Ce(NO₃)₄ = 24.16 g

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my guess answer iss 1/4 if incorrect sorr

1/5 is the dilution of reagent A in water.

Explanation:

       \(D.F.=\frac{V_f}{V_i}\)

       Where:

                 D.F = Dilution factor

                 \(V_f\) = Final volume of the diluted solution

                 \(V_i\)= Initial volume of the undiluted solution

Given:

4 parts of the reagent and 16 parts of water are mixed together to form a diluted solution.

To find:

The dilution of reagent A in water

Solution:

Parts of reagent A =\(V_i = 4\)

Parts of water = 16

Final volume of solution = \(V _f = 4 + 16 = 20\)

The dilution factor of reagent A:

\(D.F=\frac{20}{4}=5\)

The dilution of the reagent A = \(1:5=\frac{1}{5}\)

1/5 is the dilution of reagent A in water

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The term mole concept is used here to determine the moles of ammonia. The number of moles of ammonia which can be make from 6.20 moles of N₂ is 12.4.

One mole of a substance is defined as that quantity of it which contains as many entities as there are atoms exactly in 12 g of carbon - 12. The formula used to calculate the number of moles is:

Number of moles = Given mass / Molar mass

You need one nitrogen atom to produce ammonia. Here we can see that there are two nitrogen atoms in N₂.

One mole of any substance contains Avogadro number of molecules. A mole is defined as the mass of the substance which consists of the equal quantity of basic units.

The number of moles of ammonia from 6.20 moles of N₂ is:

6.20 × 2 = 12.4

Thus the number of moles is 12.4.

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The empirical formulas for at least four binary ionic compounds that can be formed from the given ions are as follows: CaF2, CaS, PbF4, and PbS2.

A binary ionic compound is made up of ions from two different elements: one metal and one nonmetal. Iron(III) iodide, FeI3, for example, is made up of iron ions, Fe3+ (elemental iron is a metal), but also iodide ions, I- (elemental iodine is a nonmetal).

The positive ion (cation) has been written first in the name, followed by the negative ion (anion). The cation has the same name as the (neutral metal) element that it is derived. The charge on the cation is denoted by a Roman numeral within parentheses immediately following the cation's name (e.g., Fe3+ = "iron(III)", Fe2+ = "iron(II)"). The anion is named by prefixing the root of (nonmetal) element name with the suffix -ide

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The measured volume of hydrogen gas will be too high.

The volume of hydrogen is measured by collecting the gas over water. The volume of the gas is measured as the volume of water displaced by the gas in an inverted container.

When air leaks into the graduated cylinder, more volume of water is displaced hence a higher volume of hydrogen gas is measured.The calculated molar volume of hydrogen will be too high as a result of this error

The gas being recorded during the experiment would not only include hydrogen gas, but the air that leaked into the eudiometer tube as well. This leads to the increase in the volume of hydrogen gas which will be too high.

Since the volume of hydrogen is too high, therefore the calculated molar volume of hydrogen would also be too high.

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The number of torrs in 84.2 mmHg is 84.2 torrs.

The torr and the millimeter of mercury (mmHg) are both units of pressure that are commonly used to measure the pressure of gases. In fact, 1 torr is defined as the pressure exerted by a column of mercury that is exactly 1 millimeter high at 0 degrees Celsius under standard gravity conditions.

Therefore, to convert from mmHg to torr, we simply need to divide the pressure in mmHg by the conversion factor of 1 torr/mmHg.

So, 84.2 mmHg divided by 1 torr/mmHg is equal to 84.2 torrs. Rounded to 1 decimal place, this is equal to 84.2 torrs.

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