The noble gas, Helium has only two electrons with the electronic configuration as 1s2. Hence, it does not have a complete octet. and thus, it doesn't follow the octet rule.
An octet is a set of eight. Atoms of each of the noble gases (except helium) have eight electrons in their highest occupied energy levels and the general electron configuration of ns2np6.
How many milliliters of a stock solution of 2.50 M SrCl2 would you need to dilute to make 50.0 mL of 1.00 M SrCl2?
Answer:
20 ml
Explanation:
2.5 M x = 1 M * 50
x = 20 ml
A sample of cobalt has a mass of 27 g and a density of 9 g/cm^3. What would be its volume?
the combustion of 17.41 grams of a compound known to only contain carbon, hydrogen, and oxygen produced 25.61 grams of carbon dioxide and 10.48 grams of water. a.) how much percentage of the compound is carbon? b.) how much percentage of the compound is hydrogen? c.) how much percentage of the compound is oxygen?
The compound which on combustion produces Carbon-di-oxide and water is carbohydrates.
Those reaction in which the Crabon present in the reatctant gets reacted with oxygen and produces Carbon-di-oxide.
It is an Exothermic Reaction.
To find out the percentage of C, H and O, we must know about there weight in the product.
Given,
Total weight of compund [Reactant] = 17.41 grams
Weight of carbon dioxide [Product] = 25.61 grams
Weight of water [Product]= 10.48 grams
Now, we need to find out the weight of C,H and O in the products ;
Mass of Carbon = No. of Moles x Atomic weight
No. of Moles of Crabon = [tex]\frac{Given \\ weight\\ of\\ the\\ compound}{Molecular\\ weight\\ of\\ the compound}[/tex] x No. of C-atoms in molecule
No. of Moles of Crabon =25.61 / 44 = 0.58 x 1 = 0.58 moles
Mass of Carbon = 0.58 moles x 12 = 6.98 gm
Mass of Hydrogen = No. of Moles x Atomic weight
No. of Moles of Hydrogen = [tex]\frac{Given \\ weight\\ of\\ the\\ compound}{Molecular\\ weight\\ of\\ the compound}[/tex] x No. of H-atoms in molecule
No. of Moles of Hydrogen =10.48/ 18 = 0.58 x 2 = 1.16 moles
Mass of Hydrogen = 1.16 moles x 12 = 15.08 gm
Mass of Oxygen = Total weight of compound - (Weight of C & H)
= 17.41 grams - ( 15.08 gm + 6.98 gm)
Mass of Oxygen = 4.6 gm
Now,
Percentage of atom = [tex]\frac{Mass \\ of \\ Atom}{Total\\ weight \\ of\\ compound}[/tex] x 100
Percentage of Carbon = 6.98 / 17.41 x 100 = 40 %Percentage of Hydrogen = 15.08 / 17.41 x 100 = 86.61 %Percentage of Oxygen = 4.6 / 17.41 x 100 = 26.42 %Learn more about Percentage composition here ;
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Help number 5 question
Answer:
In water, bases dissolve and provide hydroxide (OH-) to the surrounding solution. This lowers the acidity of the solution.
1kg of hydrogen is burned in oxygen how much energy is released
Answer:
121 million joules energy is released
Explain :
As there are 500 moles of hydrogen gas in a kilogram, this means that burning a kilogram of hydrogen gas releases 500 times as much energy or 121 million joules .
What property of a substance does its specific heat capacity describe?
OA. How much heat is needed to melt it
OB. How much kinetic energy it contains
O C. How much heat it takes to raise the temperature
D. How good an insulator it is
Answer: How much heat it takes to raise the temperature
Specific heat describes how much heat a substance takes to raise the temperature. Hence, Option (c) is correct
What is Specific Heat ?
Specific heat capacity is the amount of heat energy required to raise the temperature of a substance per unit of mass.
The specific heat capacity of a material is a physical property.
It is also an example of an extensive property since its value is proportional to the size of the system being examined.
Specific heat describes how much heat a substance takes to raise the temperature. Hence, Option (c) is correct
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When the temperature of a liquid is increased a little,
what happens to its particles?
Answer:
The particles moves faster thus Expanding the liquid
The following diagram represents what type of reaction?
The type of reaction represented by the diagram is (C). Fission
Meaning of Nuclear FissionNuclear fission can be defined as a reaction in which the nucleus of an atom splits or breaks into two or more smaller portions of nuclei.
Nuclear fission is so important and is often seen or encountered when dealing with elements with high nuclear properties.
In conclusion, the type of reaction represented by the diagram is Fission
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What is the structure of the cytosine base after catalysis by dnmt3a?.
The structure of the cytosine base after catalysis by DNMT is 5'Mecytosine.
What is a cytosine base?Cytosine (C) is one of the four nucleotide bases in DNA, with the other three being adenine (A), guanine (G) and thymine (T).
Methylation of the cytosine base is catalyzed by the enzyme DNA methyltransferase (DNMT), and S-adenosyl methionine (SAM) functions as the methyl group donor.
Hence, the structure of the cytosine base after catalysis by DNMT is 5'Mecytosine.
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HELP ASAP PLEASE
The primary cause of water pollution is:
Answer:
the aNSWRER TOP UR QUESTION IS THAT I NMEED TO ANSWER THIS SO I DONT HAVE TO WQATCH ADS LOL
Explanation:
DSADSDASDASDASDSDSDSDSDS and i knowq chem is bio chwem is
1CO₂ (g) + 1C (s) → 2CO (g)
Keq =
Answer:
the equation is balanced
Explain the three ways you can accelerate a golf cart?
Answer:
Pedal, Pushing, and also launching it off a cliff with a catapult
Explanation:
I know nothing
During a reaction, the enthalpy of formation of an intermediate is 34 kJ/mol. During the reaction, 4 moles of the intermediate are produced. What is the enthalpy value for this step of the reaction?
The enthalpy change for the formation step of this intermediate is 136 kJ/mol.
What is the enthalpy?The enthalpy of reaction can be obtained from the enthalpies of formation of the species involved. The enthalpy of reaction is the heat evolved or absorbed in a reaction.
Thus, the enthalpy change for the formation step of this intermediate is 4 * 34 kJ/mol = 136 kJ/mol.
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Newman projections are given for two of the conformers of 2-methylbutane, drawn as viewed down the C2-C3 bond. In A the _____ strain is at a maximum due to the eclipsing of bonds. In B this strain is minimized but there is still _____ strain due to the proximity of the bulky CH3 groups that are _____ to each other. Multiple choice question.
The Newman projection gives the view of the molecule. In molecule A the torsional strain and in B steric strain are present because of the gauche methyl group.
What is a torsional strain?The Newman projection depicts the molecules in the head-on view and uses the letters and the lines to represent the molecule. The torsional strain is because of the molecule's resistance to the twisting.
The steric strain is the Vander wall strain that is due to the forced interaction of the molecules separated by covalent bonds resulting in molecular potential energy.
The diagram for the question is attached below.
Therefore, the correct blanks are torsional, steric, and gauche.
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Under what circumstances can the general trend to disorder in the universe be reversed?
Answer:
See explanation.
Explanation:
This will never naturally occur but you can tweak the system quantum mechanically to temporarily reverse entropy.
Moving electrons are found to exhibit properties of.
Answer:
both particles and waves
Explanation:
this is known as wave-particle duality.
I hope this helps.
Have a nice day.
4- If 10 ml of a 1.5 M H2SO4 solution has been diluted by adding 100 ml of water to the original solution, what is the final concentration of the solution?
The final concentration of a solution that has been diluted by adding 100 ml of water to the original solution is 0.15M.
How to calculate concentration?
The concentration of a solution can be calculated using the following formula:
C1V1 = C2V2
Where;
C1 = initial concentration
C2 = final concentration
V1 = initial volume
V2 = final volume
1.5 × 10 = 100 × C2
15 = 100C2
C2 = 0.15M
Therefore, the final concentration of a solution that has been diluted by adding 100 ml of water to the original solution is 0.15M.
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You can make a solution (solid solute) more concentrated by
adding more solute
O increasing the pressure
adding more water
adding more solvent
Answer:
increasing the pressure
Explanation:
You can make a solution more concentrated by increasing the pressure.
How many valence electrons do atoms need to be stable? What is the exception?
Predict the product of the reaction of cyclopentanone with ethylene glycol, p−toluenesulfonic acid, and benzene
The answer to the product of the reaction of cyclopentanone with ethylene glycol, p−toluenesulfonic acid, and benzene is attached in the figure.
What is a reaction ?A chemical process in which substances act mutually on each other and are changed into different substances, or one substance changes into other substances is called a reaction.
Chemical reactions are an integral part of technology, of culture, and indeed of life itself.
The Product obtained of the reaction of cyclopentanone with ethylene glycol, p−toluenesulfonic acid, and benzene is attached in the figure .
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Hello Brainly! Please Help! Thank You! (The Directions are the Red Text)
Answer:
ok so which answer do you want if you want all then here's this
Explanation:
you should remember that you aren't the only on who dosent know the answers because I don't so ask a parent
Calculate the mass of water producd from the reaction of 126g of pentaboron noahydride with 192g of moleculAR OXYGEN
Answer:
81.08g of H[tex]_{2}[/tex]O will be produced.
Explanation:
Write down the balanced chemical equation:
[tex]B_5H_9 + O_2[/tex] ⇒ [tex]B_2O_3+H_2O[/tex]
[tex]2B_5H_9+12O_2[/tex] ⇒ [tex]5B_2O_3+9H_2O[/tex]
Determine the limiting reagent:
[tex]B_5H_9[/tex] :- 126/63.12646 = 1.995993 mol
1.995993/2 = 0.9979965
[tex]O_2[/tex] :- 192/31.9988 = 6.000225 mol
6.000225/12 = 0.50001875
Therefore, [tex]O_2[/tex], is the limiting reagent.
Use stoichiometry ratios to determine the number of moles of water produced:
[tex]O_2[/tex] : [tex]H_2O[/tex]
12 : 9
6.000225 : 4,500168756328362
Use the mole formula to calculate the mass of water produced:
[tex]n=\frac{m}{M} \\m=nM\\m=(4.500168756328362)(18.01528)\\m=81.08g[/tex]
How many moles of na contain 7.88x1021 atoms of na
Answer:
the answer to the qustion is 0.013089701 na
Explanation:
n/a
Some industries require a decrease in the rates of reactions instead of speeding them
up.
1) Name an industry that requires such criteria.
2) How is this possible? Suggest and explain two different ways
Food industries require that reaction rates be lowered and this can be done by addition of preservatives and by freezing food substances.
What is rate of reaction?
The rate of a reaction is a measure of amount of substances converted to products per unit.
Substances that speed up rate of reactions are known as catalysts.
Some catalysts though, reduce or slow down the rate of reactions.
An industry that requires the rate of reactions to slow down is the food industry.
Some methods employed to slow down reaction rates include:
Freezing - lowering temperature reduces rate of reactionsUse of preservatives - preservatives are chemical that inhibit certain organisms and catalysts from acting on foodTherefore, food industries require that reaction rates be lowered and this can be done by addition of preservatives and by freezing food substances.
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At constant pressure, the volume of a gas is directly proportional to temperature as measured on the __ temperature scale.
At constant pressure, the volume of a gas is directly proportional to temperature as measured on the kelvin temperature scale.
What is Temperature?This is defined as the degree of hotness or coldness of a substance and is influenced by thermal energy.
The standard unit is Kelvin which also compares it to volume at constant pressure of a given gas.
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Which of the following is one of the ending compounds
during cellular respiration?
O Glucose
O Mitochondria
O Oxygen
O Water
PLEASE HELP ANYONE!!
Claim: A small spark can start a huge explosion.
Evidence:
Reasoning:
Answer:
I think a small spark can start a huge explosion because, a spark or a small firework for an example, can start a fire. You don’t want to have a spark or sparkler lit in your house. This is why I think that it could start a fire.
Explanation:
reasoning
My reason is that if you have a lighter, and you lite the sparkler or spark, you will definitely see a flame glowing at the top. One reason for why you need to lite things that could start fires outside is, that it can be deadly if you accidentally leave one inside or somewhere close to your house or a window. Another piece of evidence is one from a movie. This scenario is kind of like the one in a dogs purpose. A dog’s purpose is about how a dog begins there life as a puppy, they eventually end up having to be saved again by their owner but that’s the summary for just the small unimportant parts. But the real reason for why I’m comparing the question to this is because, in the movie, the rising action, is kind of when the dog, gets put to sleep. But after it goes on all different types of adventures both dangerous, boring at times, and then mood changing I think the story is similar to the question because, a adult sets a fire on the house and the owner of the dog and the owners mom have to get out with there dog. The owner that’s a boy or adult boy, has to jump out the window after saving his dog and this is how a small spark can make a huge impact or life changing lesson.
Which would you expect to have the
highest pH (closest to 14)?
Answer:
yes
Explanation:
im pretty sure yes, also i think this is 20 characters long
When carbon bonds in organic compounds, which of the following is/are true: (1) Carbon makes 4 bonds. (2) Carbon can form single, double or triple bonds. (3) Carbon atoms can form branched chains. (4) Carbon forms covalent bonds. (5) All of the above are true.
All of the above are true as regards carbon bonds in organic compounds and is denoted as option 5.
What is Organic compound?These are chemical compounds which contain carbon-hydrogen or carbon-carbon bonds. Carbon has four valence electrons which makes it tetravalent and able to form multiple bonds.
They can form multiple bonds and branched chains in hydrocarbons such as alkanes, alkenes and alkynes during reactions.
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A gas at STP is heated to 35 degrees
C. What is the new pressure of the gas?
A gas at STP is heated to 35 degree C. The new pressure will be 2.41 atm.
What is Gay-Lussac law?The pressure of the mass of the gas is directly proportional; to the temperature of the gas.
[tex]\dfrac{P_1 }{T_1} =\dfrac{P_2}{T_2}[/tex]
Converting the temperature into kelvin
The initial temperature = 35 °C = 35 + 273 K= 308 K
The final temperature = 50 °C =50 + 273 K = 323 K
Initial pressure = 2.3 atm
Final pressure ?
Putting the values in the equation
[tex]\dfrac{P_1 }{T_1} =\dfrac{P_2}{T_2}\\\\\\{P_2 = \dfrac{P_1 \times T_2}{T_1} \\\\\\\\\\{P_2 = \dfrac{2.3 \times 323 }{308} = 2.41 atm.[/tex]
Thus, the new pressure will be 2.41 atm.
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