The densities of zinc, chromium and iron are 7.89, 7.20 and 7.86 g/cm³, respectively. A
metal with a volume of 12.3mL has a mass of 96.7g. What is this metal? Remember that
1 cm³ is the same as 1 ml

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:

that they are neither created or destroyed

The maximum mass of Sg that can be produced by combining 90.0 g of each reactant is 130g. It is due to the reason that the H2S is limiting agent and thus limits the amount of product that can be produced.

8 SO₂ + 16H₂S ==> 3Sg+ 16H₂O

According to this, 3 moles of S8 will be created when 8 moles of SO2 and 16 moles of H2S are combined. To calculate the maximum quantity of S8 that can be created, we must figure out how many moles of SO2 and H2S are actually present throughout this process. Which reactant, in other words, is contained in the limited supply? Let's look at the balanced equation:

8SO2 + 16H2S ==> 3S8 + 16H2O

For SO2:  92.0 g SO2 x 1 mol SO2/64.1g x 3 mol S8/8 mol H2S x 257 g S8/mol S8 = 138 g S8 formed

For H2S:  92.0 g H2S x 1 mol H2S/34.1 g x 3 mol S8/16 mol H2S x 257 g S8/mol S8 = 130. g S8 formed

So, the maximum amount of S8 that can be formed would be 130g.

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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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Answer:1.14 10x^-4

Explanation:

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:

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 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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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.

The concentration of the base is 0.162 M

We know that neutralization is a reaction in which  an acid is reacted with a base to yield salt and water only. The first step is to write down the equation of the reaction as follows;

[tex]NaOH + HCl ----- > NaCl +H_{2} O[/tex]

Now using the formula;

CAVA/CBVB = NA/NB

CA = concentration of acid

CB = concentration of base

VA = volume of acid

VB = volume of base

NA = number of moles of acid

NB = number of moles of base

CAVANB = CBVBNA

CB = CAVANB/VBNA

CB = 0.250 M * 22.7 mL * 1/35.0 mL  * 1

CB = 0.162 M

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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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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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A 12 ounce can of a soft drink such as coke classic contains 39.0 g of sugar. The mas / volume percent 10.99 % (w/v).

The soft drink ( classic coke ) contains sugar = 39.0 g

volume = 12 ounce

Mass/Volume percent = (mass of solute (g) / volume of solution (ml))×100

mass of solute = 39.0 g

volume of solution = 12 ounce

1 fluid ounce = 29.57 ml

volume of solution in ml = 12 × 29.57 ml = 354.84 ml

therefore ,

mass / volume % = (39.0 / 354.84 ) × 100 % (w/v)

                            = 10.99 % (w/v)

Thus,A 12 ounce can of a soft drink such as coke classic contains 39.0 g of sugar. The mass / volume percent is 10.99 %(w/v)

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

The enthalpy of the following system can be increased by increasing the temperature. So, the correct option is (c).

A thermodynamic system's enthalpy, which is one of its properties, is calculated by adding the system's internal energy to the product of its pressure and volume. It is a state function that is frequently employed in measurements of chemical, biological, and physical systems at constant pressure, which the sizable surrounding environment conveniently provides.

The kinetic and potential energy of the atoms and molecules in a system rise as the system's temperature rises. As a result, the system's internal energy rises, which also raises its enthalpy. This is true whether the system is under constant pressure or volume.

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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

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.

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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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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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:

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:

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

Explanation:

According to Avogadro’s law, the three balloons, although have different gases, have the same volume.

Avogadro’s law states that gas molecules at STP occupy 22.4L volume.

According to Avogadro's law, all gases have the same molar volumes at a certain temperature and pressure. As a result, even if we are unsure of the type of gas we are working with, we can still determine how much material is there.

According to Avogadro's law, if we double the volume by a certain factor, let's say x, we must likewise multiply the substance amount by x. This kind of connection is referred to as direct proportionality and can be formally stated as V ∝ n.

At Standard Temperature and Pressure (STP), i.e., 0℃ and 1atm pressure, gases like hydrogen, oxygen and carbon dioxide have a molar volume of 22.4L.

Avogadro’s law suggests that equal volumes of gases contain equal number of molecules at STP.

Therefore, 1 mol of [tex]O_2[/tex] = 1 mol of [tex]H_2[/tex] = 1 mol of [tex]CO_2[/tex] = 22.4L

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