Choose the statements that are true. Check all that apply. Choose the statements that are true.Check all that apply.
a. The chemical formula gives the conversion factor between the kind of element and the formula.
b. The chemical formula indicates the elements present in the compound and the relative number of atoms of each type.
c. The chemical formula allows the determination of mass percent composition.
d. The formula mass allows the conversion between the mass of molecules and the kinetic energy of the molecules.

The percentage yield of Li₃N is 28.63 %.

6Li(s)   + N₂ (g)   →  2 Li₃N (s)  

According to balanced reaction

6 x 6.94 g Li reacts  with  28 g N₂

12.8 g Li  reacts  with  12.8 x 28 / 6 x 6.94  = 8.61 g N2

But we have 34.9 g N₂.  so N₂  present in excess

Limiting reagent = Li

6 x 6.94 g Li gives 2 x 34.83  g Li₃N

12.8 g Li  gives  12.8 x 2 x 34.83  / 6 x 6.94   = 21.41 g Li3N

Actual yield = 6.13 g

Theoretical yield = 21.41 g

% yield = (actual yield / theoretical yield) x 100

% yield  = (6.13 / 21.41) x 100

% yield = 28.63 %

Percentage yield is the percentage ratio of real yield to the theoretical yield. It's miles calculated to be the experimental yield divided through theoretical yield increased by a 100%. If the actual and theoretical yield ​are the equal, the percent yield is one 100%.

Percentage yield is the range calculated indicating the difference in percentage among the theoretical yield and real yield of an experiment. Whilst experimenting with unique solutions or inside the manufacturing of chemical solutions you have got by means of-merchandise and the real meant products.

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The student's absolute error, given the data from the question is 0.09 mL

We'll begin by obtainig the volume of the water the student measured. This can be obtained as follow:

Density = mass / volume

Thus,

Volume = mass / density

Volume of water = 30 / 0.997

Volume of water = 30.09 mL

The absolute error can be obatined as illustrated below:

Absolute error = Measured value - accepted value

Absolute error = 30.09 - 30

Absolute error = 0.09 mL

Thue, the student's absolute error is 0.09 mL

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There would be no volume pressure work done.

Let us recall that work done in a pressure-volume work is the product of the pressure and the change in the volume of the gas. We know that we can write this as;

W = PΔV

P = pressure

V = volume

We can see that is the volume change is zero because the pressure does not change in the process, then it follows that the work done is zero.

When we say that something is constant, it means that such a thing does not change. In this case, we have been told that the volume does not change so it is constant. If we have agreed that the volume is constant end we could also agree that ΔV =0 and the volume does not change.

Hence, if a system does not change its volume during the course of a process, it does not do a pressure-volume work.

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Answer:

He figured out the amount of charge on an electron

Explanation:

Answer:
the accurate determination of the charge carried by an electron, using the e “falling-drop method”; he also proved that this quantity was a constant for all electrons, thus demonstrating the atomic structure of electricity.

Explanation:

Considering the definition of percentage by mass, the mass of a calcium chloride solution is 64.49 grams.

The percentage by mass expresses the concentration and indicates the amount of mass of solute present in 100 grams of solution.

In other words, the percentage by mass of a component of the solution is is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:

percentage by mass= (mass of solute÷ mass of solution)× 100

In this case, you know:

Replacing in the definition of percentage by mass:

24.5= (15.8 g÷ mass of solution)× 100

Solving:

24.5÷ 100= 15.8 g÷ mass of solution

0.245= 15.8 g÷ mass of solution

0.245× mass of solution= 15.8 g

mass of solution= 15.8 g÷ 0.245

mass of solution= 64.49 grams

Finally, the mass of a calcium chloride solution is 64.49 grams.

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By monitoring the temperature at just above the iodine melting point and observing the melt, it is possible to get liquid iodine at atmospheric pressure.

Iodine is a chemical element that has the symbol I and atomic number 53. If the temperature is 113.7 oC or higher, liquid iodine will be present at the bottom, though, as Mike points out, it may be challenging to see it through the intensely colored iodine vapour. The heaviest of the stable halogens, it is a semi-lustrous, non-metallic solid under normal conditions. It melts at 114 °C (237 °F) to form a deep violet liquid and boils at 184 °C (363 °F) to form a violet gas.

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Answer:there are four types they are oil,natural gas,coal, and nuclear energy

Explanation:

Answer:

4.1843 x 10²² atoms Pt

Explanation:

To find the number of platinum (Pt) atoms, you need to (1) convert grams to moles (using the atomic mass) and then (2) convert moles to atoms (using Avogadro's number). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 5 sig figs to match the amount of sig figs in the given value (13.555).

(Step 1)
Atomic Mass (Pt): 195.08 g/mol

 13.555 grams Pt                1 mole
---------------------------  x  -------------------------  =  0.069484 moles Pt
                                        195.08 grams

(Step 2)

Avogadro's Number:

6.022 x 10²³ atoms = 1 mole

 0.069484 moles Pt             6.022 x 10²³ atoms
---------------------------------  x  ---------------------------------  =  4.1843 x 10²² atoms Pt
                                                        1 mole

As the seafloor grows wider, the continents on opposite sides of the ridge move away from each other.

1.0 x 10^19 many photons are emitted by the lightbulb each second.

Assume that 8.0% of the energy output of a 65 watt light bulb is visible light

Total energy = 65 x 8/100 = 5.2 watt light is visible light

One watt (W) is equal to 1 J/s

So, 5.2 watt = 5.2 J/s

Energy carried by one 550nm photon –

Use the relation between energy and wavelength

E photon = h c / lambda

= (6.63 x 10^-34 J s) x (3.00 x 10^8 m/s)/ 550 x 10^-9 m

= 3.62 x 10^-19 J

So how many of these photons will we need to make 3.5 Joules?

Assume we require N of them in total. Then,

3.5 Joules = N x 3.62 x 10^-19 J

N = 3.5 J / 3.62 x 10^-19 J

  = 9.67 x 10^18

So, in order to emit 3.5 Joules per second, the lightbulb must emit 9.67 x 10^18 photons per second

If 5.9 % of the energy of 65 watt light is visible light

Total energy = 65 x 5.9/100 = 3.835 watt light is visible light

3.835 watt = 3.835 J/s

So how many of these photons will we need to make  3.835 Joules?

Let's assume we need some number N of them. Then,

3.835 Joules = N x 3.62 x 10^-19 J

N = 3.85 J / 3.62 x 10^-19 J = 1.0 x 10^19

So, in order to emit 4.43 Joules per second, the lightbulb must emit 1.0 x 10^19 photons per second

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Answer:

boiling points

Salt water: Salt can be separated from the water by boiling, taking advantage of the different boiling points of the two substances.

1.93g of glucose is required to produce 30KJ of energy

One of the carbohydrates referred to as simple sugars is glucose, commonly known as dextrose (monosaccharides). The chemical formula for glucose is C6H12O6, which means "sweet" in Greek. It is the main free sugar present in higher animals' blood and can be found in fruits and honey. It is the source of energy for cellular activity, hence controlling its metabolism is crucial (see fermentation; gluconeogenesis).

Starch molecules, which make up the majority of plant's energy reserves, are made up of countless linear glucose units. Cellulose is a significant molecule made primarily of glucose and is likewise linear. D-glucose is a chemical found in dextrose. Glycogen, the reserve carbohydrate found in the majority of vertebrate and invertebrate animal cells as well as those of countless fungi and protozoans, is a similar molecule in mammals.

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The number of  atoms that are in 1.50 mol of carbon-12 is 18g.

1 mol of any substance contains 6.022×1023 atoms/molecules

So 1.50 moles of carbon  will have 1.50×6.022×1023 atom = 9.0×1023 atoms

Now,  number of moles = weight g /molar mass gmol-1

1.5= weight g/ 12 gmol-1.

So weight = 1.5 mol×12gmol-1 = 18 g

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For hydrogen atoms, the energy difference for the electron transition from n = 3 to n = 2 is 0.326x[tex]10^{-18}[/tex] J.

Electromagnetic radiation's emission or absorption, atoms and molecules undergo electronic transitions (typically UV or visible).

Planck's equation, E = h, relates the energy change connected to a transition to the frequency of the electromagnetic wave.

The energy of the photon is precisely the energy that is lost when an electron moves to a level with less energy.

The photons released when the electron shifts from n=3 or above to n=2 fall in the Visible Light part of the spectrum. These passages are known as Balmer's Series.

[tex]E_{J}[/tex] = 2.179 x [tex]10^{-18}[/tex] ([tex]\frac{1}{3^{2} }[/tex] -[tex]\frac{1}{2^{2} }[/tex])

= 0.326x[tex]10^{-18}[/tex] J

Thus,  For hydrogen atoms, the energy difference for the electron transition from n = 3 to n = 2 is 0.326x[tex]10^{-18}[/tex] J.

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Answer:

For numerical purposes however, we can assume that each nitrogen is in +1 and overall oxidation... The oxidation of nitrogen in NH4+ is -3. The hydrogen atoms have +1 and there are four of them. And net charge on the molecule is +1.

Explanation:

Answer:1.14 10x^-4

Explanation:

A. The number of mole of Al(OH)₃ in the capsule is 0.0026 mole

B. The mass (in µg) of oxygen in the capsule is 124800 µg

The mole of a substance is related to it's mass and molar mass according to the following equation:

Mole = mass / molar mass

From the question given above, the following data were obtained:

Mole = mass / molar mass

Mole of Al(OH)₃ = 0.2 / 78

Mole of Al(OH)₃ = 0.0026 mole

1 mole of Al(OH)₃ contains 48 g of oxygen.

Therefore,

0.0026 mole of Al(OH)₃ will contain = (0.0026 mole × 48 g) / 1 mole = 0.1248 g of oxygen

Divide by 1000000 to express in µg

Mass of oxygen = 0.1248 / 1000000

Mass of oxygen = 124800 µg

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The cell organelles have specialized functions in order to help a cell perform different cell activities (Option 3 is correct).

The cell organelles are membrane-bound structures inside eukaryotic cells that help them to perform specialized functions such as protein synthesis (ribosomes), photosynthesis (chloroplasts), lipid processing (RE and Golgi), enzymatic degradation (lysosomes), etc.

In conclusion, the cell organelles have specialized functions in order to help a cell perform different cell activities (Option 3 is correct).

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The frequency of a photon of yellow light with a wavelength of 4.63 X 10-⁷m is 6.48 × 10¹⁴ Hz.

The frequency of a wave can be calculated by using the following formula:

v = fλ

Where;

According to this question, a photon of yellow light with a wavelength of 4.63 X 10-⁷m is given. The frequency of this photon can be calculated as follows:

f = 3 × 10⁸m/s ÷ 4.63 X 10-⁷m

f = 6.48 × 10¹⁴ Hz

Therefore, the frequency of a photon of yellow light with a wavelength of 4.63 X 10-⁷m is 6.48 × 10¹⁴ Hz.

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Answer:

that they are neither created or destroyed

There will be phase changes due to which bottle will break at the end.

We will use this information to calculate the volume of solid water.

mass of water inside the bottle = 242g

Volume of solid water = 242 × mL/ 0.916 g

= 265 mL

This calculated volume of solid water (ice) is greater than the glass bottle's 250 mL capacity. Therefore, bottle will crack.

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Anything made in the lab requires natural resources to produce it is the main problem with this idea.

The correct option is B.

Anything that helps you live better and is practical is a resource. A "Resource" is any part of the natural world that is beneficial to humans, including things like oxygen, water, foods, plants, creatures, minerals, and metals.

Stone, sand, metals, oil, coal, and natural gas are examples of natural resources. Other natural resources include things like air, sunlight, soil, and water. Natural resources include things like plants, fish, birds, and animals. The production of food, energy, and raw materials for the manufacture of commodities all depends on natural resources.

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The complete question is -

A student states that natural resources could be saved if people made everything they need in labs. What is the main problem with this idea?(1 point)

a-The materials made in labs will still pollute the environment and destroy natural resources.

b-Anything made in the lab requires natural resources to produce it.

c-There are not enough synthetic resources yet to make what people need.

d-People might think it is fine to waste a lot of the materials since they just came from a lab.

Answer:

The chart is called the Periodic Table.

Hope this helps :)

Answer:

Down >3

Explanation:

The nonliving processes such as evaporation, precipitation, etc... water returns back into the atmosphere.Explanation:Water moves through the help of living organisms in an ecosystem. Although, the non-livings processes are also the main partners of this process.Plants absorbs water through their root system and loss by transpiration. Watere also moves through the living organisms in an ecosystem. Other nonliving processes such as evaporation, precipitation, water returns back into the atmosphere!

Sorry For Miss Spelling >3

66.15 grams of mercury are present in a barometer that holds 4.9 mL of mercury.

To calculate grams of mercury

Given data,

volume = 4.9 ml

density of mercury = 13.5 g/mL

weight = ?

Using formula,

weight of mercury = density of mercury x volume of mercury

weight of mercury = 13.5 g/mL x 4.9 mL

weight of mercury = 66.15g

An instrument widely recognized as a barometer is used to measure the air pressure in a specific environment. Weather changes in the short term can be predicted by pressure tendency. Surface weather analysis uses a variety of air pressure measurements to help identify surface troughs, pressure systems, and frontal boundaries.

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28.3 micrograms equal to 6.2390820e⁻⁸ pounds.

A microgram is a unit of mass. 1 microgram is equal to one-millionth of a gram.

1 mcg = 0 lb

The pound is used in the imperial system for mass measurement.

1lb = 453592370 mcg

The SI or base unit for mass is the kilogram.

1 kg is equal to 1000000000 micrograms, or 2.2046226218488 pounds.

The conversion formula from micrograms to pound is:-

Pound (lb) = micrograms (mcg) ÷ 453592370

We have to convert 28.3 micrograms to pounds.

Dividing 28.3 with 453592370, we get

28.3 ÷ 453592370 = 6.2390820e⁻⁸ pounds

Therefore, 28.3 micrograms equal 6.2390820e⁻⁸ pounds.

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The partial pressure of oxygen gas when this mixture is delivered at a total pressure of 8.4 bar is 0.0039 bar.

The partial pressure of oxygen gas in the Heliox deep-sea diving mixture that contains 3.6g of oxygen to every 96.4g of helium is calculated as follows:

Moles of oxygen gas = mass/molar mass

mass of oxygen gas = 3.6 g

molar mass of oxygen gas = 32.0 g

moles of oxygen gas = 3.6/32

moles of oxygen gas = 0.1125 moles

Moles of helium gas = mass/molar mass

mass of helium gas = 96.4 g

molar mass of helium gas =  4.0 g

moles of helium gas = 96.4/4

moles of helium gas = 24.1 moles

Total moles of gases = 24.1 + 0.1125

Total moles of gases = 24.2125

Partial pressure of oxygen gas = 0.1125/24.2125 * 8.4 bar

Partial pressure of oxygen gas = 0.0039 bar

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