Calculate the volume of hydrogen chloride gas, HCl at s.t.p that would yield 1.2dm3 of 0.15mol/dm3 aqueous HCl solution. (Molar volume of a gas at s.t.p = 22.4dm3)

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.

Air pollution can be reduced by conserving energy, plant more trees, using efficient energy, and clean energy resources.

The air pollution can be reduced by conserving energy, going green, using efficient home energy devices, and using clean energy resources because these actions can reduce the emission of toxic gases into the atmosphere. We should use electrical devices and vehicles instead of fossil fuels vehicles.

So we can conclude that air pollution can be reduced by conserving energy, plant more trees, using efficient energy, and clean energy resources.

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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. 

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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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:

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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Answer:

5. Richter magnitude scale

6. Magma

7. Epicenter

8. Seismographs/seismometers

9. Extinct volcanoes

10. Seismogram

A mixture of acetic acid (vinegar) mixed with sodium bicarbonate (baking soda) is called carbonic acid and is very useful as a cleaning agent.

A mixture of acetic acid (vinegar) mixed with sodium bicarbonate (baking soda) is called carbonic acid and is very useful as a cleaning agent since it has a fizzling sensation.

It can be used to clean the carpet, washing machine, pressing iron, dish washer etc.

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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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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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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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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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After the complete neutralization reaction occurs, excess hydroxide ion is left unreacted the hydroxide ion of the resulting solution, [OH-] is 0.02 M.

The hydroxide ion concentration is the amount in moles of hydroxide ion in a solution.

The hydroxide ion concentration is written as [OH-].

The equation of the reaction is given below:

1 mole of HBr reacts with 1 mole of KOH

Moles of HBr = 40 mL × 0.1 M = 4 mm moles

Moles of KOH = 60 mL × 0.1 M = 6 m moles

Moles of [OH-] = 6 - 4 = 2 m moles

Volume of solution = 100 mL

[tex][OH-] = \dfrac{2m\; moles}{100\; mL} = 0.02 M[/tex]

Thus, the concentration of the hydroxide ion, [OH-] is 0.02 M.

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Hi!In an Ionic bond a metal gives a valence to a cation.

but heres a way to solve it

An athlete takes a deep breath, inhaling 1.85 L of air at 21°C and 754 mm Hg.

T

How many moles of air are in the breath? How many molecules?

Gas constant, R= 8.314 J mol ¹ K-1

PV = nRT

PV

RT

h=

=

P

= 0.08206 L atm mol-1 K-1

= 62.36 L Torr mol-1 K-1 -

1 atm = 760 mm Hg = 760 Torr

754 Forr 1.85€

6236 Jerr 294K

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Isomers are compounds which have same empirical formula , same number of atoms are present but they have difference in arrangement if the atoms.

It is given that

There are four cis, trans isomers for 2-isopropyl-5-methylcyclohexanol

the cis, trans designations of the substituents are made relative to the oh group

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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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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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Let's see

2.59 atm is the pressure inside the flask if 6 grams of nitrogen gas is introduced into an evacuated 2 L flask at 28 degrees celsius.

The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).

The computation of the pressure inside the flask is shown below;

As per the ideal gas law

we know that

P V = nRT

where

V = 2 L

T = 28 degrees celsius +273 = 301 K

m= 6 grams

R = 0.0821

Now moles of [tex]N_2[/tex] is

= 6 grams ÷ 28

= 0.21 mol

Now

P = nRT ÷ V

= (0.21 mol × 0.0821 × 301 K) ÷ 2 L

= 2.59 atm

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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 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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[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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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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Answer:

2.5litres

0.0005moles

0.56M

0.75M

0.1369M

0.255moles

0.0163M

0.10625M

3.312g

1221.14cm³

Explanations

1. 25÷1000=2.5l

2.Moles=Mass÷RFM

50÷1000÷(100)

0.0005moles

3.I litre=1000cm³

0.75litres=?

750cm³

0.42moles=750cm³

?=1000cm³

0.56M

4. Molarity=Conc. in g/l÷RFM

Conc.g/l

15g=500cm³

1000cm³

30g/l

Molarity

30÷(23+16+1)

0.75M

5.4.6g=250cm³

1000cm³

18.4g/l

Molarity

18.4÷(134.446)

0.1369M

6.3moles=1000cm³

(0.085×1000)

0.255moles

7.Conc.g/l

37.5cm³=0.181g

1000cm³

4.827g/l

Molarity=4.827÷(296)

0.0163M

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

Answer:

Energy can neither be created nor destroyed, but it does change its form. And not all forms of energy are usable and it gets dissipated as heat energy and sound energy. The energy that is wasted cannot be recovered.

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:

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!