6. a sample of nitrogen gas occupies 28.5 l at stp. how many moles of nitrogen are present?

[tex]\text{Given that,}\\\\\text{Pressure,}~ P = 1.99~ \text{atm}\\ \\\text{No. of moles,}~ n = 0.182~ \text{mol.}\\\\\text{Temperature,}~ T = 83.4^{\circ}~ C = 356.4~K\\\\ \text{Molar gas constant,}~ R = 0.082~ \text{L}~ \text{atm}~ \text{mol}^{-1}~ \text{K}^{-1}\\\\\text{Volume,}~ V =?\\\\\text{We know that,}~\\\\~~~~~~~PV =nRT\\\\\implies V = \dfrac{nRT}{P}\\\\\\~~~~~~~~~~=\dfrac{0.182 \times0.082 \times 356.4 }{1.99}\\\\\\~~~~~~~~~~\approx 2.68~ \text{L.}\\\\\\[/tex]

[tex]\text{Hence the volume of the gas is 2.68 L.}[/tex]

2.68L is the volume of a gas if 0.182 moles of the gas is at 1.99 atm and 83.4°C.

A measurement of three-dimensional space is volume. It is frequently expressed quantitatively using SI-derived units, as well as several imperial or US-standard units. Volume and the notion of length are connected. In contrast to how much space the container actually occupies, the size of a container is typically thought of as its capacity, or the quantity of liquid it could hold.

Volume was initially measured using naturally occurring vessels of a comparable shape and then with standardised containers. Arithmetic formulas can be used to quickly calculate the volume of several straightforward three-dimensional shapes. If a formula again for shape's boundary is known, it is possible to use integral calculus to determine the volumes of more complex shapes.

P×V = n×R×T  

V=n×R×T /P

=0.182 ×0.082×356.4 /1.99

=2.68L

Therefore, 2.68L is the volume of a gas if 0.182 moles of the gas is at 1.99 atm and 83.4°C.

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An atom gains an electron from another atom. Hence, option B is the correct answer.

An atom is a particle of matter that uniquely defines a chemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons.

When an atom shares electrons with another atom then it results in the formation of a covalent bond.

Whereas when an atom transfer electrons from one atom to another then it results in the formation of an ionic bond.

When the nucleus of an atom splits then it represents a nuclear fission reaction and energy is released during this process.

Hence, option B is the correct answer.

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The correct chemical symbol for an atom that has 23 protons and 29 neutrons is 52/23 V. Details about chemical symbol can be found below.

Chemical symbol is the 1- to 3-letter international code for a chemical element.

The chemical symbol of an element shows the atomic mass and mass number of the element.

The mass number of an element is the sum of the number of protons and neutrons. In this case, the mass number of the element is 23 + 29 = 52

Therefore, the correct chemical symbol for an atom that has 23 protons and 29 neutrons is 52/23 V.

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The final volume of the diluted acid that was initially in a 55 mL bottle of 12 M HCl and diluted with water to a 2.5 M HCl solution is 264mL.

The volume of a solution can be calculated using the following formula:

C1V1 = C2V2

Where;

12 × 55 = 2.5 × V2

660 = 2.5V2

V2 = 264mL

Therefore, the final volume of the diluted acid that was initially in a 55 mL bottle of 12 M HCl and diluted with water to a 2.5 M HCl solution is 264mL.

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The volume of NaOH needed to neutralize 40. ml of 0.15 m Hcl acid is 12 mL.

The volume of base needed to neutralize 40. ml of 0.15 m Hcl acid is calculated as follows;

C1V1 = C2V2

V1 = (C2V2)/C1

V1 = (40 x 0.15)/(0.5)

V1 = 12 mL

Thus, the volume of NaOH needed to neutralize 40. ml of 0.15 m Hcl acid is 12 mL.

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Answer:

When the string on a violin vibrates, waves move in both directions along the string, interfering with each other. These waves are standing waves.

Explanation:

What are Standing Waves?

The Standing Waves are waves generated due to the vibrational frequency that produces reflected waves capable of interfering with the incident waves. 

The amount of oxygen in grams that reacted with 5.6 g of hydrogen to produce 41.4 g of water is 36.8 g

2H₂ + O₂ —> 2H₂O

Molar mass of O₂ = 32 g/mole

Mass of O₂ from the balanced equation = 1 × 32 = 32 g

Molar mass of H₂O = 18 g/mole

Mass of H₂O from the balanced equation = 2 × 18 = 36 g

SUMMARY

From the balanced equation above,

36 g of H₂O was produced from 32 g of O₂

NOTE: O₂ is the limiting reactant

From the balanced equation above,

36 g of H₂O was produced from 32 g of O₂

Therefore,

41.4 g of H₂O will be produced from = (41.4 × 32) / 36 = 36.8 g of O₂

Thus, 36.8 g of O₂ reacted to produce 41.4 g of H₂O

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Answer:

Blood

Explanation:

'B'    stands for   'Blood'   in  Blood Alcohol Content

Answer:

ions need to be present in the water. If there are no ions in solution, no electricity is conducted. since, in water, electricity is conducted, this means that HCl completely ionizes to H + and C l − ions. However, in chloroform, since there is no conduction, HCl does not ionize and stays as the

Explanation:

It is to be noted that there are two enol derivates that are possible because the parent ketone is not symmetric. See the explanation below.

The chemicals produced in the liver is what are referred to as Ketones. Usually,

Ketones are created by the liver when the body is experiencing a deficiency in the production of insulin in the body.  Insulin, of course, converts sugar into energy.

Hence, the enol that will be in harmony or balance with the given ketone 2-Pentanone is indicated in the attached.

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The arrows that represent the phase transitions in which heat energy is gained is : (A). 1, 2 and 3

Phase transitions can be defined as the changing of matter from one form to another due to the addition or gaining of heat or due to the removal or loss of heat.

Phase transitions in matter are majorly between three phases which are: Solid, Liquid and Gas.

In conclusion, The arrows that represent the phase transitions in which heat energy is gained is : (A). 1, 2 and 3

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Ionization energy is the periodic property of an element. The copper atom has the highest ionization energy among gold and silver atom.

Ionization energy is the amount of energy required for the removal of the loosely bounded electron from an atom. The ionization energy can be first, second, and third based on the number of electrons.

Ionization energy down the group decreases from top to bottom as the atomic radii of the element increase. So, the ionization energy for the given elements is Cu > Au > Ag.

Therefore, copper has the highest ionization energy.

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Answer:

24.7 grams H₂O

Explanation:

To find the mass of water, you should (1) convert from grams HCl to moles (via molar mass from periodic table), then (2) convert from moles HCl to moles H₂O (via mole-to-mole ratio from equation), and then (3) convert from moles H₂O to grams (via molar mass from periodic table).

1 HCl + KOH --> 1 H₂O + KCl

Molar Mass (HCl): 1.008 g/mol + 35.45 g/mol
Molar Mass (HCl): 36.458 g/mol

Molar Mass (H₂O): 2(1.008 g/mol) + 16.00 g/mol
Molar Mass (H₂O): 18.016 g/mol

50 g HCl        1 mole HCl          1 mole H₂O           18.016 g
--------------  x  ------------------  x  -------------------  x  -------------------  = 24.7 g H₂O
                        36.458 g           1 mole HCl          1 mole H₂O

Characteristic of Chemical Change: c. boil to a gas

1. Chemical changes involve the transformation of one substance into another substance with different properties.

2. Option c, "boil to a gas," is a characteristic of chemical change.

3. When a substance undergoes a chemical change, it may experience a change in its physical state, such as boiling, as a result of the chemical reactions occurring at the molecular level.

4. Boiling refers to the process in which a substance changes from a liquid state to a gaseous state, usually by the absorption of heat energy.

5. During a chemical change, the bonds between atoms or molecules in the substance are broken and rearranged, leading to the formation of new substances.

6. The change in state from a liquid to a gas indicates that a chemical reaction has taken place, resulting in the formation of different chemical compounds.

7. On the other hand, options a and b, turning cloudy and melting into a liquid state, are characteristics of physical changes rather than chemical changes.

8. Turning cloudy generally occurs due to the formation of suspended particles in a substance, while melting refers to the transition from a solid to a liquid state without the formation of new substances.

9. Option d, breaking into smaller pieces, can also be a characteristic of physical changes, such as when a solid is mechanically fragmented, without any alteration in its chemical composition.

10. Therefore, among the given options, the characteristic that specifically indicates a chemical change is c, boiling to a gas.

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From the calculations, the heat of fusion of the substance is 0.73 kJ

The heat of freezing is the energy released when the substance is converted from liquid to solid.

Now we know that the molar mass of the substance is 82.9 g/mol  hence the number of moles of the substance is;  13.3 g /82.9 g/mol  = 0.16 moles

Now the heat of fusion shall be;

H = 4.60 kj/mol * 0.16 moles

H = 0.73 kJ

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Addition of pure water does not change pH of a solution because pure water has neutral pH.

Even though you continue to add pure water into a substance, the acidity or alkalinity of substance still remains the same to that of substance because pure water has neutral pH which can't change the acidity or alkalinity of a solution.

So we can conclude that addition of pure water does not change pH of a solution because pure water has neutral pH.

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Answer:

5. Richter magnitude scale

6. Magma

7. Epicenter

8. Seismographs/seismometers

9. Extinct volcanoes

10. Seismogram

Based on the equation of the reaction, for every 1 mole of oxygen that reacts, 4 moles of electrons are transferred.

Redox reactions are reactions in which oxidation and reduction reactions occur simultaneously to the same extent.

Oxidation reactions involves addition of oxygen or removal of oxygen.

The equation of reaction when one mole of oxygen accept ectrons is given below:

[tex]O_2 + 4e^{-} \rightarrow 2O^{2-}[/tex]

Therefore, for every 1 mole of oxygen that reacts, 4 moles of electrons are transferred.

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Answer:

B- how much time it took a fossil to form

Explanation:

To determine the ages in years of Earth materials and the timing of geologic events such as exhumation and subduction, geologists utilize the process of radiometric decay.

69 mmHg pressure is exerted by oxygen if 40% of the gas pressure is exerted by the oxygen gas.

Pressure is defined to be the amount of force exerted per area

40% of pressure is exerted by oxygen gas.

So, 60% of pressure will be exerted by carbon dioxide gas.

60% of 115 mmHg = 69 mmHg

Hence, 69 mmHg pressure is exerted by oxygen if 40% of the gas pressure is exerted by the oxygen gas.

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The volume occupied by the sample is 8.4 cm³

The density is the ratio of mass of the object to its volume.

Given is the mass m =14.7 g and the density is 1.75 g/cm³, then the volume will be

ρ = m/ V

V =m /ρ

Substitute the values, we get

V = 14.7 /1.75

V = 8.4 cm³

Thus, the volume of the sample is  8.4 cm³.

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Answer:

7 methyl 3 octyne is the answer option D

Name the following alkyne is  7-methyl-3-octyne.

So, option D is correct one.

In the given organic compound, the numbering is started from left hand side because from that side triple bond come first.

In given carbon chain, one triple bond is present at 3rd carbon and one methyl group present at 7th carbon.

The methyl group which is branching at 7th carbon written first.

The suffix yne is added at the end of alkyne name.

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The two ways in which energy is measured include:

This is defined as the capacity or the ability to do work in an object or body at a given time.

Thermal energy is a determining factor in the level of temperature and convection which makes it the most appropriate choice.

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Answer:

D. in wavelength and temperature!

Explanation:

Answer:

Oxygen

Carbon

Silicon

Hydrogen

Beryllium

Lithium

Explanation:

The trend of electronegativity is that electronegativity increases across a period, and decreases down a group. This means that the elements in the top right of the periodic table are the most electronegative (excluding noble gases)

Knowing this, let's rearrange the elements given in the question.

We have oxygen, carbon, silicon, hydrogen, lithium, and beryllium.

First let's separate the elements on the left and right side of the periodic table:

Left: Hydrogen, lithium, beryllium.

Right: Oxygen, carbon, silicon.

The elements on the right are more electronegative than the left.

Let's focus on the right elements.

Oxygen would be the most electronegative because it is furthest to the right.

Next would be carbon, because it is one higher than silicon.

Then, it would be silicon.

Now, let's look at the left elements.

Hydrogen would be the most electronegative because it is the highest.

Next would be beryllium because it is to the right of lithium

Last would be lithium because it is the most left, and down the group.

So, the final answer will be

Oxygen

Carbon

Silicon

Hydrogen

Beryllium

Lithium

Hope this helps!! If you have any questions about what I said please leave them down in the comments!

The darkening of the atmosphere caused by meteorites would have reduced the sizes of some ecosystems due to less solar energy being available to plants.

This is the form of energy which is derived from the sun and is usually trapped by plants during photosynthesis.

Plants being primary producers will have less photosynthetic activity thereby leading to less food production and oxygen availability.

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answer:

This allows us to tell alkenes apart from alkanes using a simple chemical test. Bromine water is an orange solution of bromine. It becomes colourless when it is shaken with an alkene. Alkenes can decolourise bromine water, but alkanes cannot.

explanation:

The AZX symbol of  a cation with 13 neutrons is A = 24 , Z = 11 and X = Na+

AZX is a symbol which stands for;

Note, cations are positively-charged ions having more protons than electrons due to loss of one or more electrons.

Sodium ion represented as Na+ is a cation which lost one electron. It has 13 neutrons and 11 protons.

But the mass number of an element, A is the sum of protons and neutrons of the element.

Thus, for Na+

A = 13 + 11 = 24

Z = 11

X = Na+

Therefore, the AZX symbol of  a cation with 13 neutrons is A = 24 , Z = 11 and X = Na+

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4 neutrons that are produced along with the Zn and sm. The complete final equation is:  ²³⁵U + ¹n → [tex]\;^{72}Zn+\;^{160}sm[/tex] + 4 n

Atomic mass, the quantity of matter contained in an atom of an element.

1) In the left side of the transmutation equation appears:

²³⁵U + ¹n →

Deleting the atomic number (subscript to the left) because the question does not show them as it is focused on a number of neutrons.

2) The right side of the transmutation equation has:

→ [tex]\;^{72}Zn+\;^{160}sm[/tex] +?

3) The total mass number of the left side is 235 + 1 = 236

4) The total mass number of Zn and sm on the right side is 160 + 72 = 232

5) Then, you are lacking 236 - 232 = 4 unit masses on the right side which are the 4 neutrons that are produced along with the Zn and sm.

The complete final equation is:

²³⁵U + ¹n → [tex]\;^{72}Zn+\;^{160}sm[/tex] + 4 n

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