Answer:
brittle
Explanation:
How many valence electrons do atoms need to be stable? What is the exception?
How many moles of na contain 7.88x1021 atoms of na
Answer:
the answer to the qustion is 0.013089701 na
Explanation:
n/a
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
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.
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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Which of the following is one of the ending compounds
during cellular respiration?
O Glucose
O Mitochondria
O Oxygen
O Water
Help number 5 question
Answer:
In water, bases dissolve and provide hydroxide (OH-) to the surrounding solution. This lowers the acidity of the solution.
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
Four cars travel at the same speed down a road. Their mass and kinetic energy are shown in the graph,
80,000
60,000
40,000
al
20,000
0
500
1,000
1,500 2,000
Mass (kg)
Which statement is true about the kinetic energy of the cars?
OA, Kinetic energy is unrelated to the mass of the cars.
B. Kinetic energy is proportional to the mass of the cars.
Oc. Kinetic energy is proportional to the mass of the cars squared.
OD. Kinetic energy is inversely proportional to the mass of the cars.
Kinetic Energy (1)
Answer:B
Explanation:
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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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
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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How many moles of a gas sample are in a
20.0 L container at 373 K and 203 kPa? The gas constant is 8.31 L - kPa/mol -K.
0.33 mole
0.65 mole
1.30 moles
3.05 moles
The moles of the gas sample present is 1.30 , Option C is the right answer.
What is Ideal Gas Equation ?Ideal Gas Equation states that for an ideal gas , the product of pressure and volume is equal to the product of moles , universal gas constant and the temperature.
PV =nRT
Given in the question
Volume = 20 Litre
T = 373 K
P = 203kPa
R =8.31 L - kPa/mol -K.
Therefore
203 * 20 = n *8.31 *373
n = 1.30 moles
Therefore the moles of the gas sample present is 1.30 .
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An air mattress is filled with 0.55 moles of air. the air inside the mattress has a temperature of 295 k and an absolute pressure of 3.5 kilopascals. what is the volume of the air mattress? the volume of the air mattress is liters.
The volume of the air mattress filled with 0.55 moles of air and has a temperature of 295 k and an absolute pressure of 3.5 kilopascals is 386L.
How to calculate volume?The volume of a gas can be calculated by using the ideal gas law equation as follows:
PV = nRT
Where;
P = pressureV = volumen = number of molesR = gas law constantT = temperature0.0345 × V = 0.55 × 0.0821 × 295
0.0345V = 13.32
V = 386L
Therefore, the volume of the air mattress filled with 0.55 moles of air and has a temperature of 295 k and an absolute pressure of 3.5 kilopascals is 386L.
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Answer:
The answer is 34.2 L.
Explanation:
Ideal Gas Law = PV = nRT
(where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.)
Plug in the known values into the Ideal Gas Law equation:
3.5 kPa * V = 0.55 moles * 8.31 J/mol*K * 295 K
Finally, solve for V:
V = (0.55 moles * 8.31 J/mol*K * 295 K) / 3.5 kPa
= 34.2 L
TRUE OR FALSE
Q1.) Is the distances of the gas molecules are far greater than it's molecule dimensions.?
Q2.) The movement of any gas particle/molecules is directly affected by temperature.?
｡ﾟ(TヮT)ﾟ｡ H-Help me with this pls...,,
Answer:
Q1. False
Q2. True
Explanation:
gas molecules are not that at far than dimensions molecules
the granite sample has a mass of 24.31 g and a volume of 9.35cm3. what is the density of the granite?
the density is 2.6 g/mL
Explanation:
you divide 24.31 by 9.35 and end up with 2.6111707841, just round it off to 2.6
The density is 2.6 g/mL of granite.
What is density?
Density is defined as the mass per unit volume it means that mass present in 1 meter cube is called density. The S.I unit of density is kg/m^3 and in C.G.S it is gram/cm^3.
So In above statement we can understand that density, mass, and volume all are convert to each other it means that if we know any two variable then third one will be calculated easily.
Mathematically,
Formula for density will be as mentioned below:-
Density = Mass/Volume.
From above formula we can calculate mass which is as follows:-
Mass = Volume × Density.
S.I unit of mass is kilograms and C.G.S unit is gram.
And similarly we can calculate the volume which is equal to as follows:-
Volume = mass / density.
S.I unit of volume is meter cube and C.G.S unit is cubic centimeter. Density is defined as the mass per unit volume it means that mass present in 1 meter cube is called density.
From above formula we can calculate mass which is as follows:-
Mass = Volume × Density.
S.I unit of mass is kilograms and C.G.S unit is gram.
Therefore, The density is 2.6 g/mL of granite.
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Griffin made the following list of the different outer coverings of a plant. which part of his list is incorrect?
outer coverings of plants
fuzzy hairs
spines
bark
stamen
bark
fuzzy hairs
spines
stamen
Stamen is not an outer covering its the reproductive organ of the plants.
What is use of covering of Plants ?Outer covering of plants is useful in protecting them from environment factors , it is useful in keeping the moisture intact inside the plants.
Among the different outer covering , Bark ,stamen , spines and fuzzy hairs
Bark , stamen and fuzzy hairs are all the outer covering of plants
Stamen is not an outer covering its the reproductive organ of the plants.
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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.
ANS THIS SMALL QUESTION
A solution of sulfuric acid (h2so4) has a concentration of 6.0m. it contains 14.7mol h2so4. what is its volume? reference: m = mol/l
group of answer choices
0.41l
88.2l
none of these are correct.
2.45l
Answer:
V = 0.41L
Explanation:
[tex]c=\frac{n}{V}\\n=cV\\14.7=6.0V\\ \\V=0.41l[/tex]
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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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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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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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.
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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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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How many moles are in 8.35 g of H2O?
What mass of Na2CO3 will be required to dissolve in 0.3 L of water to make a 0.5 M solution?
The mass of [tex]Na_2CO_3[/tex] that will be required to be dissolved in water would be 15.9 grams
Solution preparationRecall that: molarity = mole/volume in L
In this case, the volume is 0.3 L and the molarity is 0.5 M.
Thus, mole = molarity x volume = 0.5 x 0.3 = 0.15 moles
Mass of 0.15 moles [tex]Na_2CO_3[/tex] = 0.15 x 106 = 15.9 grams
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How do potential and kinetic energy work?
Answer:
You now know that potential energy is position relative, and kinetic energy is motion relative. The primary relationship between the two is their ability to transform into each other. In other words, potential energy transforms into kinetic energy, and kinetic energy converts into potential energy, and then back again.Explanation:
don't forget to mark me brainlistCalculate 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]