Answers
Related Questions
During nuclear fission and fusion, what is matter that seems to disappear actually converted into?
mass
energy
volume
nuclei
Answers
. Calculate the pH and the pOH of each of the following solutions at 25 °C for which the substances ionize completely:
(a) 0.200 M HCl
(b) 0.0143 M NaOH
(c) 3.0 M HNO3
(d) 0.0031 M Ca(OH)2
Answers
pH= -log [H3O+]
PH=-log (0.200)
= 0.699
poH= 14-0.699
= 13.301
b. NaOH:
PoH= -log [OH-]
= -log (0.0143)
= 1.845
pH= 14-poH
= 14- 1.845
= 12.16
c. HNO3:
PH= -log[H3O+]
=-log(3.0)
= -0.4771
poH= 14-pH
= 14-9-0.4771
= 14.4771
pH= -0.4771, poH= 14.4771
d. [Ca(OH)2] = 0.0031M
[OH-]= 2X0.0031
[OH-] = 0.0062M
PoH= - log[OH-]
=-log(0.0062)
=-log(6.2x10-3)
=-(-2.21)
= 2.21
PH=14-poH
=14-2.21
=11.79
POH=2.21, PH= 11.79
Based on the molarity of the solutions;
For 0.200 M HCl; pH = 0.699, pOH = 13.301For 0.0143 M NaOH; pOH = 1.845, pH = 12.16For 3.0 M HNO3; pH = -0.4771, poH = 14.4771For 0.0031 M Ca(OH)2; pOH = 2.21, pH = 11.79What pHand pOH?pH is the negative logarithm to base ten of the hydrogen ions concentration of a solution.
pH = -log[H+]pOH is the negative logarithm to base ten of the hydroxide ions concentration.
pOH = -log[OH-]Also;
pH + pOH = 14For HCl:
pH = -log [H3O+]
pH =-log (0.200)
pH = 0.699
Then;
poH= 14-0.699
pOH = 13.301
For NaOH:
pOH= -log [OH-]
= -log (0.0143)
pOH = 1.845
Then;
pH= 14-poH
= 14- 1.845
pH = 12.16
For HNO3:
pH= -log[H3O+]
=-log(3.0)
= -0.4771
Then;
pOH = 14-9-0.4771
pOH = 14.4771
For [Ca(OH)2]
molarity = 0.0031M
2 moles of OH- are produced
[OH-]= 2 × 0.0031
[OH-] = 0.0062M
pOH = - log[OH-]
=-log(0.0062)
=-log(6.2x10-3)
=-(-2.21)
pOH = 2.21
Then;
pH =14-2.21
pH =11.79
Learn more about pH and pOH at: https://brainly.com/question/13557815
A 13 Ohm resistor, R, is connected to a battery with unknown voltage, V, as shown below. The total current, I, flowing through the circuit is 1.24 Amperes. Find the unknown voltage, V, of the battery in Volts. Round your answer to 2 decimal places
Answers
Answer:
16.12 V
Explanation:
Ohms law explains or portrays the relationship between the voltage (V), current (I) and resistance (R). This is represented using the equation as follows:
V = IR
Where;
V = voltage (Volts)
I = current (amperes)
R = resistance (ohms)
According to the information provided in the question, resistance (R) = 13 Ohm, current (I) = 1.24 Amperes, V = ?
V = 13 × 1.24
V = 16.12 V
28.0 g of N2 gas was found to occupy a volume of 8.44 L at a
pressure of 320 kPa. What is the temperature of the gas?
Answers
Are there options for this question? ...........
Answer:
Therefore, the temperature of the gas is 84.9 ℃. 28.0 g of N2 gas was found to occupy a volume of 8.44 L at a pressure of 320 kPa.
Explanation:
Therefore, the temperature of the gas is 84.9 ℃. 28.0 g of N2 gas was found to occupy a volume of 8.44 L at a pressure of 320 kPa.
describe how water molecules can hydrate various substances
Answers
Answer:
A water molecule can react with the carbonyl group of an aldehyde or a ketone to form a substance known as a carbonyl hydrate, as shown in the first reaction below. The carbonyl hydrates usually form a very small percentage of the molecules in a sample of a specific aldehyde or ketone.
(Nice profile pic also UwU)
Which of the following methods can be used to identify the suspected use of heat lamps in a house without entering the house?
A. Identify the lamps inside the house using x−ray machines.
B. Detect the heat emitted by the lamps using infrared rays.
C. Use special cameras to emit ultraviolet light that can detect the heat lamps.
D. Capture the images of lamps inside the house using radars that send radio wave signals.
Answers
Answer:
b I see some of ask you to do it
Answer:
B. Detect the heat emitted by the lamps using infrared rays.
Explanation:
Two solutions are mixed, bringing together ions of Na+, PO43−, V3+, and Cl−. Use the solubility rules to identify the composition of the salt that precipitates out of the solution.
Answers
Consider the following chemical reaction:
HF + NaOH - NaF + H20
Energy must be invested in order for the reaction to proceed.
What bonds must be broken in order for the reaction to proceed.
Select ALL that apply.
A. An ionic bond between sodium and hydroxide.
B. An ionic bond between sodium and fluorine.
C. A covalent bond between sodiume and fluorine.
D. An ionic bond between hydrogen and fluorine.
DE. A covalent bond between hydrogen and fluorine.
DE A covalent bond between hydrogen and oxygen
Answers
Answer: The correct options are A and E
Explanation:
A chemical reaction is defined as the reaction in which two or more chemical substances react to form two or more different chemical substances.
A new substance (product) is formed in a chemical reaction when the bonds between the reactants are broken so that the new bonds between the products can be formed.
For a given chemical reaction:
[tex]HF+NaOH\rightarrow NaF+H_2O[/tex]
Here,
HF is a covalent compound as sharing of electrons take place between hydrogen and fluorine atom
NaOH is an ionic compound as a complete transfer of electrons occurs from sodium to hydroxide.
Thus, to form the products, an ionic bond between sodium and hydroxide must be broken coupled with a covalent bond between hydrogen and fluorine.
Hence, the correct options are A and E
12. Which nonmetal is the most reactive?
A bromine
B
iodine
C) fluorine
D) chlorine
Answers
Answer:
C Fluorine
Explanation:
Pleaseee helpppp.....
Answers
Answer:
C. All of the above
Explanation:
They all happen beyond critical point.
Cuantos segundos hay en un año solar (365.24)
Answers
Answer:
31556736
Explanation:
One parent is has a genotype of Qq and the other parent qq. What is the percent chance that their child will have a genotype of Qq?
Answers
Answer: 50%
Explanation:
How is the Law of Conservation of Mass, Matter, Phases of Matter, and Physical/Chemical Changes similar/connected to one another?
Answers
Answer:
Solids, liquids, and gases are made of tiny particles called atoms and molecules. In a solid, the particles are very attracted to each other. They are close together and vibrate in position but don't move past one another. In a liquid, the particles are attracted to each other but not as much as they are in a solid.
what is periodic law
Answers
i already solved this but can someone check !!
Answers
Each____
is a female sex organ about the size and
shape of an almond
Answers
Each [tex]\sf\purple{ovary}[/tex] is a female sex organ about the size and shape of an almond.
Explanation:-
Ovaries are the the primary female reproductive organs. There are two ovaries which are located on either side of the uterus. The two functions of ovaries are -i) to produce eggs (ova) and ii) to produce female hormones.[tex]\bold{ \green{ \star{ \orange{Mystique35}}}}⋆[/tex]
14. Each beaker shown to the right contains iron and an
acid. In which beaker will the iron dissolve the fastest
and why?
a. Beaker A because of a higher concentration level.
b. Beaker A because of increased surface area.
C. Beaker B because of a higher concentration level.
d. Beaker B because of increased surface area.
Answers
The question is incomplete, the complete question is attached in the image below:
Answer: The correct option is D) Beaker B because of the increased surface area.
Explanation:
A solution consists of solute and solvent.
A solute is defined as a component that is present in a smaller proportion while a solvent is defined as a component that is present in a larger proportion.
Solubility is defined as the amount of solute that can be dissolved in a given amount of solvent to form a solution.
Solubility of a substance depends on a few factors:
Surface areaMolecular sizeTemperatureStirring effectFor the given images,
Beaker A has a large block of iron rod and Beaker B has iron shards.
The smaller molecular size of a substance increases its surface area and thus, increases the solubility.
Hence, the correct option is D) Beaker B because of the increased surface area.
what is the chemical formula : hydrogen and chlorine ?
Answers
Answer:
HCl
Explanation:
That’s is the formula
I hope this helps
Which of the following is an example of nuclear fission?
A. A gamma emitter is used to trace movement of chemicals in the
environment.
B. A radioactive drug that emits electrons is used to treat cancer in a
patient.
O c. Two different isotopes of hydrogen form an isotope of helium on
the sun.
O D. A large radioactive atom breaks into smaller atoms, producing
nuclear energy.
Answers
The statement which is an example of nuclear fission is that a large radioactive atom breaks into smaller atoms, producing nuclear energy.
What is nuclear fission?Nuclear fission is a kind of radioactive decay reaction in which an unstable nuclei of an atom will split into smaller stable nuclei by the emission of lots of energy.
Gamma emitter is used inside the human body to trace the information that assists in making a diagnosis by the help of medication.To treat cancer patient high energetic rays like x-rays, gamma-rays are used.Formation of isotope of helium from two different isotopes of hydrogen is an example of nuclear fussion reaction.Hence in nuclear fission a large radioactive atom breaks into smaller atoms, producing nuclear energy.
To know more about nuclear fission, visit the below link:
https://brainly.com/question/3992688
why does shampoo remove hair grese for chemistry acids and alkali
Answers
What force is important in the creation of both coal and petroleum?
Answers
Explanation:
heat and pressure are two main forces that transform organic matter into fossil fuels
What does the molarity of a solution indicate?
A) The concentration in grams of a substance in the solution
B) The concentration in grams of the substance per gram of water
C) The concentration in moles of a substance per mole of water
D) The concentration in moles of a substance in the solution
Answers
The molarity of a solution indicates the concentration in moles of a substance in the solution (Option D)
What is molarity?Molarity is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:
Molarity = mole / Volume
For example: What is the molarity of a solution containing 75 g of KNO₃ in 0.35 L of solution.
How to determine the mole of KNO₃Mass of KNO₃ = 75 gMolar mass of KNO₃ = 39 + 14 + (3×16) = 101 g/mol Mole of KNO₃ =?Mole = mass / molar mass
Mole of KNO₃ = 75 / 101
Mole of KNO₃ = 0.743 mole
How to determine the molarity Mole of KNO₃ = 0.743 mole Volume = 0.35 L Molarity =?Molarity = mole / Volume
Molarity = 0.743 / 0.35
Molarity = 2.12 mol/L
From the above, we can see that the molarity indicates the concentration in mole of the substance in the solution.
Thus, the correct answer to the question is:
The concentration in moles of a substance in the solution (Option D)
Learn more about molarity:
https://brainly.com/question/9468209
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Which of the following is a non polar molecule ?
Answers
N2 is non polar because electronegative of both the atoms are same and N2 also have linear shape
Ecosystems involve interactions between biotic and abiotic factors. Using one or more complete sentences name two abiotic and two biotic factors that might make up an ecosystem.
Answers
Answer:
Examples of biotic factors in an ecosystem are plants and animals
Examples of abiotic factors in an ecosystem include sunlight and type of soil
Explanation:
An ecosystem is a self-supporting unit composed of living and non living parts. Materials and energy flow within the ecosystem.
The ecosystem is composed of living and nonliving parts which affect each other in very significant ways.
The biotic factors of the ecosystem are the living factors such as plants and animals.
The abiotic factors are the nonliving factors of the ecosystem such as sunlight and type of soil.
Determine the number of subatomic particles in bromine-35.
Answers
Number of subatomic particles=35+36+35=106
Explanation:
Atomic number=35
Mass number=71
No. of proton p=35
No. of neutron n=71−35=36
No. of electron e=35
Help!! I don't understand and need someone to help me answer thank you : )
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Explanation:
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I.
Look at the pictures below. What can you say about them?
Describe their similarities and differences. Write your answer in
your notebook
Www
cowo
Politics
SXO
is
Answers
Answer:
Hey , I can't see the picture
How did reducing the number of
decomposers affect the amount of carbon
dioxide in the ecosystem?
Answers
Answer:
As organisms release energy during cellular respiration, carbon dioxide is produced from the carbon in energy storage molecules. ... Carbon dioxide in the biodome decreased because decomposers decreased which means there was a decrease in cellular respiration overall.
btw :
stay safe! :3
Who is my favourite wrestler?
Answers
Answer:
ma herdina thesto wrestling
When objects of two different temperatures are in contact, what happens?
Answers
Answer:
If two objects at different temperatures are brought in contact with each other, energy is transferred from the hotter to the colder object until equilibrium is reached and the bodies reach thermal equilibrium.
Explanation:
