What is the pH of a 0.8 M LiOH solution?
a)0.097
b)13.9
c)6.29
d)9.84
Answer: 13.9
Explanation:
LiOH is a base, so the pOH is given by [tex]-\log(0.8)=0.0969[/tex].
So, since pOH + pH = 14, the pH is 14-0.0969, which is about 13.9
A student mixes 40. Ml of 0. 10mhbr(aq) with 60. Ml of 0. 10mkoh(aq) at 25°c. What is the [oh−] of the resulting solution?
After the complete neutralization reaction occurs, excess hydroxide ion is left unreacted the hydroxide ion of the resulting solution, [OH-] is 0.02 M.
What is the concentration of the hydroxide ion, [OH-]?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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AZX symbol of a cation with 13 neutrons
The AZX symbol of a cation with 13 neutrons is A = 24 , Z = 11 and X = Na+
What is AZX?AZX is a symbol which stands for;
A is the mass numberZ is the atomic number or the number of protonsX is the chemical symbol of the elementNote, 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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Rank the following atoms from the most electronegative (top) to the least electronegative (bottom).
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!
A 55 mL bottle of 12 M HCl was diluted with water to a 2.5 M HCl solution. What is the final volume of the diluted acid?
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.
How to calculate volume?The volume of a solution can be calculated using the following formula:
C1V1 = C2V2
Where;
C1 = initial concentrationC2 = final concentrationV1 = initial volumeV2 = final volume12 × 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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In an Ionic bond a metal gives a valence to a?
Hi!In an Ionic bond a metal gives a valence to a cation.
what biological molecules transport other substances, provide structural
support, cause the movement of muscles, and catalyze chemical reactions in
living organisms?
The biological molecules that transport other substances are the proteins.
What are proteins?Proteins are biological macromolecules that contains nitrogen in their molecules and are the building block of a living organism.
The proteins perform the following functions:
they transport other substances,provide structural support,cause the movement of muscles, and catalyze chemical reactions in living organisms.Learn more about protein here:
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Avogadro's law relates the volume of a gas to the number of moles of gas
when temperature and pressure are constant. According to this law, how
would the volume of a gas change if a reaction produced 3 moles of gas from
1 mole of gaseous reactants?
A. The volume would be three times the original volume.
B. The volume would be one-ninth of the original volume.
C. The volume would be one-third of the original volume.
D. The volume would be nine times the original volume.
The volume would be three times the original volume is the correct answer.
What change occur in the volume of product?The volume would be three times the original volume because a reaction produced 3 moles of gas from 1 mole of gaseous reactants. The ratio between reactants and products are 1:3 which shows that three times increase occur in the volume between reactant and products.
So we can conclude that the volume would be three times the original volume is the correct answer.
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When bromine water is shaken with a liquid organic compound it is rapidly
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:
1.A solution has a volume of 2500 mL. How
many liters is this?
2. Convert 50 g of calcium carbonate, CaCO3,
into moles.
3. A solution contains 0.42 moles of solute in
0.75 L. Calculate the molarity of the solution.
4. What is the molarity of a solution that contains
15.0 g of NaOH per 500.0 mL of solution?
5. A 250.0 mL solution contains 4.6 g of copper
(II) chloride, CuCl2. Find the molarity of this
solution.
6. How many moles of hydrochloric acid, HCl, are
present in 0.085 L of a 3.0 M solution?
7. A 37.5 mL solution contains 0.181 g of
potassium chromate, K2CrO4. What is the
molarity?
8. What is the molarity of a solution that contains
0.85 g of ammonium nitrate, NH4NO3, dissolved
in a solution with volume 100.0 mL?
9. Calculate the mass of lead (II) nitrate, Pb(NO3)2,
necessary to make 50.0 mL of a 0.100 M solution.
10. What volume of a 0.35 M solution of sodium
chloride could be formed with 25 g of NaCl?
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
How many moles of electrons are transferred for each mole of o2 that reacts? justify your answer in terms of the balanced equation and the change in oxidation number of oxygen
Based on the equation of the reaction, for every 1 mole of oxygen that reacts, 4 moles of electrons are transferred.
What are redox reactions?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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identify the world that is being described in each statement about the previous topic afterwards write the first letter of each answer to the corresponding number of missing letters to reveal the words below
help me plss
Answer:
5. Richter magnitude scale
6. Magma
7. Epicenter
8. Seismographs/seismometers
9. Extinct volcanoes
10. Seismogram
D
Question 13
An atom has 23 protons and 29 neutrons. Which is the correct chemical symbol for this atom?
52 V
23
52 Cu
23
29 C
29 V
23
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.
What is chemical symbol?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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Addition of water to an alkyne gives a keto‑enol tautomer product. Draw the ketone that is in equilibrium with the given enol
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.
What is a Ketone?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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Which describes the two ways that energy is measured?
The two ways in which energy is measured include:
TemperatureConvectionWhat is Energy?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:
I
10. how many grams of koh are there in 200 grams of 10% by mass koh solution?
Answer: 20 grams
Explanation:
[tex]10=\frac{\text{grams of KOH}}{200}\\\text{grams of KOH}=20[/tex]
Heat that flows by conduction is the transfer of thermal energy between substances in contact. What must occur for this
to happen?
O The two systems must be the same temperature.
O The two systems must not be touching each another.
O
One system must have higher kinetic energy than the other system.
The thermal energy of one system must be the same as the thermal energy of the other system.
One system must have higher kinetic energy than the other system is the correct statement.
What is conduction?Conduction is the process by which heat is transmitted through the material of a substance when there is a difference of temperature between two bodies.
So we can conclude that One system must have higher kinetic energy than the other system is the correct statement.
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Heat flow by conduction requires that the two systems must not be touching each another.
What is heat energy?Heat energy is a form of energy that exists due to a temperature difference between two objects.
Heat energy flows from an object at higher temperature to an object at a lower temperature.
Heat transfer by conduction involves the vibration of particles of the medium transferring heat due to contact between the two objects.
Therefore, heat flow by conduction requires that the two systems must not be touching each another.
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Hi, um im in honors chem and at the moment we are doing a 08.06 honors environmental impact and im stuck on this question, i honestly just need help determining what it is asking for...does it want me to put a criteria with a constraint? or just make a list putting them in order (not grouping them together)? . anyways heres the question and the solutions i chose:
prioritization: make one priority list that ranks the criteria and constraints together. explain the ranking of each criterion and constraint, and support your decisions with research.
01. air pollution can be reduced by new regulations from legislation, treaties, and agreements among nations as well as by enforcement of existing regulations with harsher penalties.
02. air pollution can be reduced by conserving energy (large amounts of fossil fuels are used to produce energy), going green, using efficient home energy devices, and using clean energy resources.
Air pollution can be reduced by conserving energy, plant more trees, using efficient energy, and clean energy resources.
How air pollution can be reduced?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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HELP!! I need some real world applications for different amounts of acetic acid (vinegar) mixed with sodium bicarbonate (baking soda). This is really important for my assessment so please help!!!
A mixture of acetic acid (vinegar) mixed with sodium bicarbonate (baking soda) is called carbonic acid and is very useful as a cleaning agent.
What is the use of acetic acid (vinegar) mixed with sodium bicarbonate (baking soda)?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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Name the following alkyne:
CH3
CH₂CH₂C=CCH₂CH₂CHCH
B. 2-methyl-5-octyne
D. 7-methyl-3-octyne
A. 7-methyl-3-nonyne
C. 7-methyl-3-octane
PLS HELP ASAP
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.
What is an alkynes?This organic compound have at least one triple bond.An alkynes are unsaturated hydrocarbons.The molecular formula of alkynes are [tex]C_{n} H_{n}[/tex]The numbering in alkynes is started from that side from where the triple bond come first.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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If a tank of gas contains 4 L of N O2 how many molecules are in it
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
A 25.0 mL sample of an aqueous solution of calcium hydroxide, Ca(OH)2, is titrated to the equivalence point with 21.2 mL of 0.620 M sulfuric acid, H2SO4, acid solution. What is the molarity of the calcium hydroxide solution?
Let's see
C1V1=C2V225C1=21.2(0.620)25C1=13.144C1=0.526M
Determine the mass of water produced from 50g hydrochloric acid and
excess potassium hydroxide. HCI + KOH --> H₂O + KCI
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
When the u-235 nucleus is struck with a neutron, the zn-72 and sm-160 nuclei are produced, along with some neutrons. How many neutrons are emitted?.
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
What atomic mass?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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There are four cis,trans isomers for 2-isopropyl-5-methylcyclohexanol, where the cis,trans designations of the substituents are made relative to the oh group:
up, up, up (cis,cis)
up, up, down (cis,trans)
up, down, down (trans,cis)
up, down, up (trans,trans)
consider the most stable chair for each of these isomers, and then draw the most stable and least stable isomer based on a comparison of the best chair for each one.
The image is attached with the answer.
What are Isomers ?
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
The image is attached with this answer.
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if 6 grams of nitrogen gas is introduced into an evacuated 2 L flask at 28 degrees celsius, what is the pressure inside the flask?
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.
What is an ideal gas equation?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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During an asthma attack the airway swells decreasing the volume given to the air molecules to travel to the lungs, according to Charles law what can be done to increase the volume of the airway?
During an asthma attack temperature can be decreased to increase the volume of the airway.
What is Charle's Law ?This law describes how a gas expands as the temperature increases; conversely, a decrease in temperature will lead to a decrease in volume.
[tex]\rm \dfrac{V'}{T'} = \dfrac{V}{T}[/tex]
which means volume is inversely proportional to temperature so the temperature can be decreased in the atmosphere to increase volume of the airway.
This means that, when you inhale cold air, it will change volume as it warms in passing through the sinuses.
As the air warms it expands to a larger volume.
Therefore during an asthma attack temperature can be decreased to increase the volume of the airway.
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When hydrogen gas is bubbled into 2-butyne, the product is
Answer:
On treatement of 2 -with hydrogen gas and lindlar catalyst, the major product obtained is cis-2butene.
Why is there an energy crisis if energy is supposedly conserved? Explain your answer and cite one example
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.
What can scientists learn from radiometric dating?
A- how long ago a plant or animal lived
B- how much time it took a fossil to form
C- where a plant or animal lived
D- whether a fossil has modern relatives
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.