What is reduced in the reaction below?
2H₂ + O2 → 2H₂O
O A. H₂
OB. H₂0
O C. 0₂
OD. Reduction does not occur.

Answer:

7.) 126.7 cm³

8.) 789 g

Explanation:

7.) To find the volume (cm³) of alcohol, you need to multiply the given mass (g) by the density. The denisty ratio represents grams of the alcohol per every 1 cm³. It is important to arrange the ratio in a way that allows for the cancellation of units (grams should be in the denominator). The final answer should have 4 sig figs to match the given value with the least amount of sig figs (100.0 grams).

 100.0 grams                  1 cm³
---------------------  x  ---------------------------  =  126.7 cm³
                                0.78945 grams

8.) This time, you are given the volume instead of the mass. The same process can be used in this problem, but you first need to convert liters (L) to cm³ to be able to use the denisty ratio. Once you find the volume in cm³, you can multiply it by the density to find the mass. Again, be sure to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the given value with the least amount of sig figs (1.00 L).

1 L = 1,000 cm³

  1.00 L           1,000 cm³           0.78945 g
-------------  x  -------------------  x  --------------------  =  789 g
                             1 L                     1 cm³

The number of electrons for sulfur, selenium, tellurium, and polonium will have in their outer shell is 6,6,6,6 respectively.

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The name of the lab equipment is bunsen burner.

A bunsen burner is a piece of equipment found in many laboratories primarily used for the controlled burning of flammable gas in the air.

In the laboratory, the bunsen burner is used as a source of heating for reactions. The gas-air mixture can be controlled to determine the level of flame and heat that will be produced.

Bunsen burners can vary in structure depending on the maker. The gas supply can be any of butane, propane, etc.

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Answer:

there are only three elements in 3CaSO4: calcium, sulfur and oxygen

Answer: 16.7 pounds of mercury

Explanation:

556 mL * 13.6 g/mL=

556 mL * 13.6 g/1 mL=

556 * 13.6/1=

556*13.6=

7561.6 g=

7561.6 g * 1 pound/453.592 g=    ==> 1 pound=453.592 grams

7561.6 * 1/453.592=

7561.6/453.592=

16.67=16.7 pounds of mercury

The measure of how densely a material is packed together is called density. As the mass per unit volume, it has that definition. The mass in pounds of mercury is 16.635 pounds.

The term "density" refers to the ratio between the volume (the amount of space an object or substance occupies) and the mass (the quantity of material it contains). Density can also be defined as the quantity of mass per unit of volume. A dense object is one that is both hefty and small.

Density is the measure of an object's mass per unit volume. Kilograms per cubic meter (kg/m³) is the SI unit for density.

Density = Mass / Volume

13.6 g/mL = (m) / (556 mL)

m = 13.6 g/mL × 556 mL

m = 7561.6 g

1 g = 0.0022 pound

7561.6 g = 16.635 pounds

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The result in binary would be 10000011110101100000.

By constantly dividing the supplied number by 2 until we receive 0 as the quotient, we can convert a decimal number to a binary number in the simplest way possible. The binary value of the specified decimal number is then obtained by writing the remainders in reverse order. A binary number is made up of two 0s and 1s. Two is used as the base representation for binary numerals. As an illustration, (101)2 (101) 2. Switches can be used to encode and store numbers in binary form. This system is compatible with a variety of digital devices, including computers, calculators, digital TV decoder boxes, cell phones, burglar alarms, watches, and more. Binary values are kept in memory, which is essentially a collection of electronic on/off switches.

The complete question is- Convert 540000 to Binary form.

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Answer:

the atomic weight of mass is 196.96657 u

The strength of this intermolecular force will be Strong, because it is a result of interaction between ions and polarized molecules.

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The pH of a solution with a [H3O+]  is 4.9 .Thus option (b) is true.

pH is defined as negative log of H3O+ ion construction.

The pH can be calculated using formula:

pH = - log [H3O+].

[H3O+] = 7.5 x 10-4 M

pH = - log[7.5 x 10-4M]

pH = 4.9

The pH of a solution with a [H3O+] = 9.4 x 10-7 M = 2.6 = (a)

The pH of a solution with a [H3O+] = 3.7 x 10-14 M = 4.9 = (b)

The pH of a solution with a [H3O+] = 4.2 x 10-2 M = 2.6 = (a)

Thus, the pH of a solution with a [H3O+]  is 4.9 .Thus option (b) is true.

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Answer:

115.21 degrees Celsius

Answer: pure water is homogeneous and pure substance.

Explanation: However, when a homogeneous substance consists of two or more different types of molecules uniformly intermingled with one another, then it’s called a homogeneous mixture. A mixture’s composition can vary, but a pure substance does not.

Answer:

True

Explanation:

since the gases and minerals dissolved in water are in the same state as water and they do not form separate layers

The orbital diagram is shown below ,

The [tex]Cd^{+2}[/tex] ion is diamagnetic .

The Atomic number of Cd = 48

Electronic configuration of Cd is is [tex]1s^{2} 2s^{2}2p^{6} 3s^{2} 3p^{6} 3d^{10} 4p^{6} 4d^{10}5s^{2}[/tex] .

After the removing two electrons from Cd , Cd gets two positive charges and becomes   [tex]Cd^{+2}[/tex] .

The electronic configuration of  [tex]Cd^{+2}[/tex]  is  [tex]1s^{2} 2s^{2}2p^{6} 3s^{2} 3p^{6} 3d^{10} 4p^{6} 4d^{10}[/tex] .

The  [tex]Cd^{+2}[/tex] has no unpaired electron . Hence , it is diamagnetic in nature .

The orbital diagram of  is shown as follows,

The shell structure of a cadmium atom, which has 48 electrons, is 2.8. 18.18.2. Ground state gaseous neutral cadmium has the electron configuration [Kr] in its ground state.

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According to the given statement A sample of pure zinc has a mass of 4.50 g has a volume of 0.631 cm³.

A three-dimensional object's volume, expressed in cubic units (as inches, quarts, or centimetres), is its cubic capacity. the volume that a material takes up in a given space.

As opposed to length, width, and height for a rectangular shape's area, the basic formula for volume is length, breadth, and height. The calculation is unaffected by how the different dimensions are referred to; for example, "depth" can be used in place of "height."

Volume= Density/Mass

Mass = 4.50 g

Density = 7.13 g/cm³

Volume = ?

Volume = 4.50 g/7.13 g/cm³

Volume = 0.631 cm³

The zinc has a 0.631 cm³ volume.

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​

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The mass of 3.2 mL of a liquid with specific gravity of 0.986 is 3.155 g

The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as

Density = mass / volume

With the above formula, we can determine the mass of the liquid. Details below

The following data were obtained from the question:

Density = mass / volume

Cross multiply

Mass = Density × Volume

Mass of liquid = 0.986 × 3.2

Mass of liquid = 3.155 g

Thus, the mass of the liquid is 3.155 g

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Answer:

High humidity

Warm

High Pressure.

Answer:

Relative Humidity: high

Air Temperature: warm

Air Pressure: low

Answer:

6 metres per second squared

Explanation:

Gain in velocity = 60 - 30 = 30 m/s.

Time taken for this gain = 5 seconds

Average acceleration = 30 / 5 = 6 m/s/s.

So, 6 metres per second squared.

Halogens are p-block elements, group IIA & alkali metal belongs to s-block and nonreactive elements are known as noble gases.

Chemical elements are listed on a periodic table according to their atomic number. Carbon and oxygen are two of the chemical elements listed in the periodic table.

The Periodic Table groups the elements according to their linked chemical and physical properties. The table consists of rows and columns. Vertical columns of the periodic chart represent groups. The table displays periods as horizontal rows.

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CCC Pattern compare the ions of elements listed in the table with the atoms of the element. Based on the patterns in their particle compositions and charges, the definition of ion would be that CCC pattern compare ions of elements.

An ion is a structure in crystal system having regular repeating arrangement, which can be called as an ionic lattice.

Lattice is formed because ions attract each other and form a regular pattern with oppositely charged ion next to each other.

An atom is the smallest unit of an element that retains the chemical properties of element. Every atom includes a nucleus, generally containing both positively charged particles called ions and uncharged particles called ion.

In the space surrounding, the nucleus are negatively charged particles called electron.

Therefore, ions are oppositely charged particles in lattice.

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Sodium has three shells while beryllium has two shells. Beryllium has one more valence electron compared to sodium.

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The calculated energy is 3.97×10⁻²¹J

A single photon has an energy of hv or = (h/2), where h is the Planck constant of 6.626 x 10-34 Joule-sec. If the photon's frequency is known, we may apply the formula E = h f to determine a photon's energy. The equation E = h c can be used to determine a photon's energy if its wavelength is known.

The photon has a 3.97 1021 J energy.

E=hf, with

Planck's constant is h, and the photon's frequency is f.

The second equation is f=c, where c is the speed of light and is the photon's wavelength.

F=c, so we can write

E=hcλ

=6.626×10⁻³⁴J⋅s×2.998×10⁸m⋅s⁻¹/5.00×10⁴×10⁻⁹

=3.97×10⁻²¹J

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Answer:

?

Explanation:

Is there supposed to be a picture or is that only 5he question?

Answer:

if the forces among the particles that makeup the nucleus are balanced, it is stable. Stable atoms retain their form indefinitely, while unstable atoms undergo radioactive decay. Most naturally occurring atoms ate stable and do not decay. A stable atom has a net charge of 0. In other words, It has an equal number of protons and electrons.

The observation shown in the image is qualitative.

Chemical analysis will be;   Qualitative

In a qualitative chemical analysis, we can  determine the components of a substance. In a quantitative analysis, we want to determine the amount of every  of the components of a substance. Both sorts of analysis are of very much  important in chemistry.

From the image, we could  observe a change in color . Qualitative analysis might  be carried out by the  use of chemical reagents which could give positive tests like  as  change  in color to show the presence or absence of some  constituents of a  given substance.

Qualitative analysis provides the  details of the presence or nonappearance of different chemical components in a unknown sample. Qualitative chemical analysis,  deals with the branch of chemistry identification of elements or grouping of elements provided in a sample. This  techniques employed in qualitative analysis vary in complexity, depending on the nature of the sample

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Answer: what is normality =

As per the standard definition, normality is described as the number of gram or mole equivalents of solute present in one liter of a solution. When we say equivalent, it is the number of moles of reactive units in a compound.

How can you prepare sodium carbonate in 250 ml?

Procedure

Take a watch glass, wash it with distilled water and dry it.

Weigh the exact amount of clean and dried watch glass and record its weight in the notebook.

Weigh correctly on the watch glass with 1.325 g of sodium carbonate and record this weight in the notebook.

Using a funnel, transfer sodium carbonate softly and carefully from the watch glass into a clean and dry measuring flask.

Wash the watch glass with distilled water to move the particles that stick to it into the foam with the assistance of a wash bottle.

For this purpose, the volume of distilled water should not exceed 50 ml.

Wash funnels several times with distilled water to move the sticking particles into the measuring flask using a wash bottle. Add water in tiny quantities while washing the funnel. The distilled water quantity used for this purpose should not exceed 50 mL.

Using a wash bottle, wash the funnel carefully with distilled water to pass the solution attached to the funnel into the measuring flask

Turn the flask of measurement until the sodium carbonate dissolves.

Using a wash bottle, thoroughly add enough distilled water to the measuring flask just below the etched mark on it.

Add the last few mL of distilled water drop into the measuring flask until the reduced meniscus level just touches the mark.

Put the stopper on the mouth of the flask and shake softly to make the entire solution uniform. Calculate it as a solution of sodium carbonate N/10.

10 solutions of sodium carbonate in 250 ml?

Normally in the laboratory, we are required to prepare 250 ml of solution. Therefore, to prepare 250 ml of \frac{M}{10} Na2CO3 solution, \frac{10.6}{4} = 2.650 g of sodium carbonate are dissolved in lesser quantity of water and the solution is diluted to exactly 250 ml

Explanation:

Answer:

Explanation:

It is A because the electrice flows through the cord to give energy for the blades to move.

Answer:

Yes, it can be separated through evaporation. It retains its original properties.

Explanation:

Sodium is a metal that belongs to group 1 of the periodic table.

My favorite element is sodium. Sodium is found in group one of the periodic table. The element is univalent and also forms univalent positive ions. Like every other metal, sodium is able to react with dilute acids to liberate hydrogen gas.

Sodium is a light metal and is known to react with mercury to form the sodium mercury amalgam which is obtained during the electrolysis of sodium chloride. All of the compounds that are formed by sodium are ionic in nature. However the hydrides of sodium are unstable.

Sodium is highly reactive thus it must not be exposed to air since it could ignite spontaneously in air. As such, sodium must be stored under paraffin oil. All the compounds of sodium are ionic in nature.

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Explanation:

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