Answer:
0.355 moldm^-3
Explanation:
46 g of glycerin were dissolved in 100 g of water. What is the freezing point of this solution?
Additional information:
М(С3Н5(ОН)3) = 92 g/mol;
Тf(Н2О) = 273.15 К;
Кf = 1.86 kg⋅К/mol.
Based on the formula to determine the freezing point depression of the solvent, the freezing point of the solution is 263.85 K.
What is the freezing point of a substance?
The freezing point of a substance is the temperature at which the liquid changes to solid without any further decrease in temperature occurring during the process.
The addition of solute substances in liquids usually lowers the freezing point of the liquid solvent.
The formula to determine the freezing point depression of solvent is given below:
ΔT = i * Kf * mwhere'
ΔT is the change in freezing point,i is the van't Hoff factor,Kf is the freezing point depression constant, andm is the molality of the solution.The molality of the given solution = moles of solute/kg of solvent
moles of solute = 46/92
mass of solvent = 100 g or 0.1 kg
Molality of solution = (46/92) / 0.1
Molality of solution = 5
for glycerine, i = 1
ΔT = ΔT = 1 * 1.86 * 5
ΔT = 9.3
The freezing point of the solution = 273.15 - 9.3
The freezing point of the solution = 263.85 K
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What is the calculated value of the cell potential at 298K for an electrochemical cell with the following reaction, when the Hg2 concentration is 7.36E-4 M and the Al3 concentration is 1.05 M
Answer:
Explanation:
Concentration of Hg⁺² = 7.36 x 10⁻⁴ M
Concentration of Al⁺³ = 1.05 M
2Al + 3Hg⁺² = 2Al⁺³ + 3Hg .
E = E₀ + RT / nF ln [ Al⁺³]² / [ Hg⁺² ]³
E₀ = reduction potential of Hg⁺² minus reduction potential of Al⁺³
= 0.92 V - ( - 1.66 V )
= 2.58 V
E = 2.58 + .059 /n log [ Al⁺³]² / [ Hg⁺² ]³
n = 6 , [Al⁺³] = 1.05 M ; [Hg⁺²] = 7.36 x 10⁻⁴ M
E = 2.58 + .059 /6 log [ 1.05]² / [ 7.36 x 10⁻⁴ ]³
= 2.58 + .059 /6 log 27.65 x 10⁸ .
= 2.58 + .059 /6 [8+ log 27.65 ].
= 2.58 + .059 /6 [8+ log 27.65 ].
= 2.58 + .09
= 2.67 V .
Lisa has a glass that has a mass of exactly 100 grams. She puts exactly 45 grams of acid in the glass, and then she adds 15 grams of crushed limestone. When the limestone touches the acid, it makes bubbles. Lisa waits until the reaction stops, and then she weighs the glass and its contents. What should Lisa expect to find about the mass of the glass and its contents when she puts it on a scale?
Answer:
She should expect for the scale to say 145 grams.
Explanation:
Limestone is mostly made up of the mineral calcium carbonate (CaCO3). But if you add an acid, you add hydrogen ions (H+), which will react with the carbonate to form hydrogen carbonate HCO3- ions, which are very soluble in water, and the limestone will dissolve. So, if you add 100+45 you get 145.
Pick the selection that increases in energy.
7f, 6s, 4p
4s, 4p, 4d
1s, 6f, 4d
3d, 4s, 3p
Answer:
i think mix im um 1s 6f 4d is correct answer
Which statement is true about the electric field?
Question 3 options:
The field points away from positive charges and toward negative charges.
The strength of the field increases proportional to the charge that creates it.
The strength of the field decreases proportional to the square of the distance from the charge.
All of the above
During the electrolysis of molten sodium chloride, which ion discharges at the anode?
Answer:
it should be chlorine gas
Explanation:
The moon phase takes about a year to complete.....True or false?
Answer:
the answer is false and the reason why is because every 29 days it completes one full cycle
Explanation:
ammonia chemically reacts with oxygen gas to produce nitric oxide and water. what mass of oxygen gas is consumed by the reaction of 8.4 g of ammonia?
the mass of nitric oxide produced by the reaction of 8.4 g of oxygen gas is 4.32 g. ammonia chemically reacts with oxygen gas to produce nitric oxide and water.
What oxygen is used for?Common uses of oxygen include production of steel, plastics and textiles, brazing, welding and cutting of steels and other metals, rocket propellant, oxygen therapy, and life support systems in aircraft, submarines, spaceflight and diving.
Why is oxygen important?Oxygen helps organisms grow, reproduce, and turn food into energy. Humans get the oxygen they need by breathing through their nose and mouth into their lungs. Oxygen gives our cells the ability to break down food in order to get the energy we need to survive.
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Why do some elements not take part in chemical bonds?
Answer:
Because there is some element which is already in an octet state and has no need to achieve it, they have a full electron in their outermost shells such as helium, argon etc.
What happens when,
a) Hydrogen gas is bubbled into acidified potassium permanganate solution?
b) Some piece of zinc are added into acidified permanganate solution?
c) Hydrogen gas is bubbled into acidified potassium dichromate solution?
d) Some pieces of zinc are added in acidified potassium dichromate solution?
e) Hydrogen gas is bubbled into acidified ferric chloride solution?
f) Some piece of zinc are added into acidified ferric chloride solution?
Add the required chemical reactions as well
Explanation:
I)reaction between potassium paramagnet with H2 forms MnO2
Select the correct answer. Which is true according to the law of conservation of energy? A. In a closed system, the total amount of energy in the universe keeps on changing. B. The supply of energy is limited, so it is essential to conserve it. C. In a closed system, energy can be created and destroyed. D. In a closed system, energy cannot be used faster than it is created. E. In a closed system, the total energy always remains constant.
in the image there is answer okk
Aşağıdakilerden hangisi ülkemizde nesli tüken-
me tehlikesi taşıdığı için koruma altına alınan
canlılardan birisidir?
A) Koyun
B) At
Kardelen çiçeği (bitkisi)
D) Panda
Answer:
D seçeneği doğru
Explanation:
Türkiye'de kırmızı pandalar tehlike altında. Pandaların neslinin tükenmesinin ana nedenleri:
a) Habitat tahribatı
b) Genetik varyasyon kaybı, dolayısıyla onları hayatta kalmak için daha az uygun hale getirir
Bu nedenle, D seçeneği doğrudur
what mass of O2(g) is required to completely react with 25.0g of Fe(s)?
3Fe(s) + 2O2(g) → Fe3O4(s) (Balanced)
Give two different conditions under which long chain hydrocarbons may be cracked.
Answer:
Various methods can be used for cracking, eg catalytic cracking and steam cracking: Catalytic cracking uses a temperature of approximately 550°C and a catalyst known as a zeolite which contains aluminium oxide and silicon oxide. Steam cracking uses a higher temperature of over 800°C and no catalyst.
PLSSSS HELP Humus is made of ___________? (Select all that apply.)
mineral deposits
bedrock
microorganisms
organic material
inorganic material
insects
Answer
I'm pretty sure it would be (Insects, and microorganisms)
Explanation:
If its not correct I'm sry
Answer:
it would be Insects, and microorganisms
Explanation:
I finished the quiz minute ago
structure of potassium trioxalatoaluminate(iii)?
Answer:
K3[Al(C2O4)3] is the answer
The net ionic equation for formation of an aqueous solution of Al(NO3)3 via mixing solid Al(OH)3 and
aqueous nitric acid is
Answer:
Al(OH)3 (s) + 3H+ (aq) → 3H2O (l) + Al3+ (aq)
Explanation:
The net ionic equation for the reaction between solid Al(OH)₃ and aqueous nitric acid, HNO₃ is
3H⁺(aq) + Al(OH)₃ (s) —> 3H₂O(l) + Al³⁺(aq)The reaction between Al(OH)₃ and HNO₃ will proceeds as follow:
HNO₃ (aq) —> H⁺(aq) + NO₃¯(aq)
HNO₃ (aq) + Al(OH)₃ (s) —>
H⁺(aq) + NO₃¯(aq) + Al(OH)₃ (s) —> H₂O(l) + NO₃¯(aq) + Al³⁺(aq)
Cancel the spectator ion (i.e NO₃¯)
H⁺(aq) + Al(OH)₃ (s) —> H₂O(l) + Al³⁺(aq)
Write 3 before H⁺ and H₂O to obtain the balanced ionic equation as shown below:
3H⁺(aq) + Al(OH)₃ (s) —> 3H₂O(l) + Al³⁺(aq)
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What is a solution?
Two solutes mixed together
A solute and solvent mixed together
A solute or solvent by themselves
Two solvents mixed together
oc
d
Answer:
A solute and a solvent mixed together.
Explanation:
A solution is a solute and a solvent mixed together. An example would be salt water. Salt would be the solute (the thing that's getting dissolved) and water would be the solvent (the thing that does the dissolving)
Help!!!
1.
Q: How does the distillation apparatus remove impurities from water?
Q: Why does water vapour condense in the condenser tube?
Q: As the boiling animation neared the end, what does the change in the proportion of particle types in the boiling flask indicate about the impurities?
Answer:
Q1) Distillation relies on evaporation to purify water
Explanation:
contaminated water is heated to form steam. inorganic compounds and large non-volatile organic molecules do not evaporate with the water and are left behind. The steam then cools and condenses to form purified water
How does a fire help grasslands? Choose all that apply
Question 5 options:
keeps trees from overtaking the grasses
preserve biodiversity
helps contain only coarse grass
all of the above
Answer:
I believe its all above
Explanation:
Fire on grasslands keep the tress from overtaking the grasses on fire. They can thereby preserve biodiversity. Fire on grassland helps contains coarse grass only. Therefore, all of the above is correct.
What are the impacts of fire on grasslands?The addition of nutrients to the soil, the facilitation of easier grazing by herd animals, and the inhibition of the establishment of invasive plant species all contribute to the health and sustainability of grasslands.
The grassland ecology benefits from the natural occurrence of fire since it keeps it strong and healthy. It increases the soil's temperature and lessens the annual buildup of leaf litter, allowing sunshine to enter.
Warming the soil stimulates microbial activity, which liberates nutrients from decomposing plant matter that are essential for the growth of new grasses and flowers. All the given points are in direct or indirect way help the grassland.
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What type of reaction is shown below c10H8+12O2 10co2+4H2O
Answer:
Explanation:
Combustion. Have fun with that.
Antigens are substances that may induce immune response as they are recognised and bound by antibodies or cells of the immune system.
Based on your knowledge of the structures of bacteria and viruses, can you suggest some examples of molecules that are antigenic?
Some examples of molecules that are antigenic may be proteins and or polysaccharides in the cell wall of pathogenic bacteria which may be targeted by the immune system during the production of antibodies.
What is the relationship between antigens in pathogenic bacteria and antibodies of the immune system?The relationship between antigens in pathogenic bacteria and antibodies of the immune system is based on the fact that antigens are biomolecules in the pathogens that can be targeted to bond antibodies that are produced by the organism in immune responses against bacteria, viruses, and allergens in the air and foods, etc.
Therefore, with this data, we can see that antigen molecules be any type of biomolecule present in the pathogen and the relationship between antigens in pathogenic bacteria and antibodies of the immune system is based on the binding between them (antigens and antibodies) which is fundamental during certain specific immune responses.
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Pasagot kailangan Asap
Answer:mmhm
Explanation:
mhhm
Answer:
do u want the answer now?
Consider the following chemical reaction:
4 Al(s) + 3 O2(g) ⟶2 Al2O3(s)
If 4.2 grams of Al reacts with 3.0 grams of O2,
1. How many grams of Al2O3 could be produced?
2. Which reactant is limiting?
3. Which reactant is excess?
4. How much of the excess reactant would remain?
Answer:
1. mAl₂O₃ = 6.42 g
2. O₂
3. Al.
4. mAl = 1.67 g
Explanation:
Let's calculate the moles of Al and O2 first before doing any other calculations. The molecular weights of Al and O are 26.98 g/mol and 16 g/mol, so the moles are:
moles = mass / Atomic weight or molar mass
moles Al = 4.2 / 26.98 = 0.156 moles
moles O2 = 3 / (2*16) = 0.094 moles
The molar mass of Al2O3 is:
MM = (2 * 26.98) + (3*16) = 101.96 g/mol
With these data, let's determine each part:
1, 2 and 3. Grams of Al2O3, limiting and excess reactant:
To do this, we need to know which is the limiting reactant. this reactant will tell us how many moles are produced of Al2O3 and then, with the previously calculated molar mass, we can determine its mass. Let's see again the overall reaction taking place:
4Al + 3O₂ ---------> 2Al₂O₃
According to this reaction, 4 moles of Al reacts with 3 moles of oxygen, so:
If: 4 moles Al ---------> 3 moles O₂
Then: 0.156 moles ----------> X
X = 0.156 * 3/4 = 0.117 moles of O₂ required.
However, we do not have 0.117 moles of O₂, we have 0.094 moles, therefore we can conclude that the oxygen is the limiting reactant and Aluminum is the excess reactant.
Now, the moles produced of Al₂O₃ will be:
3 moles O₂ -------> 2 moles Al₂O₃
0.094 moles -------> Y
Y = 0.094 * 2/3 = 0.063 moles of Al₂O₃
Finally the mass would be:
mAl₂O₃ = 0.063 * 101.96
mAl₂O₃ = 6.42 g4. mass of excess reactant:
The mass of excess reactant would be:
moles Al = 0.156 - 0.094 = 0.062 moles
mAl = 0.062 * 26.98
mAl = 1.67 gHope this helps
Use the ideal gas law to find the volume that 4.30 mol of oxygen gas occupies at 99.7 kPa and 35.0 °C.
help please
According to the ideal gas law, 4.30 molecule of o2 occupies 0.11 m³ at 99.7 kPa with 35.0 °C.
What is a straightforward definition of ideal gas law?The relationship between a gas's pressure P, volumes V, and t in the range between low pressures and extremely high temperatures, when the gas's water moves virtually independently of one another, is known as the ideal gas, also known as the perfect gas law.
PV = nRTp = pressure in PaV
= volume in m³n = number of molesR
= molar gas constant (8.31 JK⁻¹mol⁻¹)T
= temperature in Kpressure ⇒ 99.7 × 10³ Pa
temperature ⇒ 35.0 + 273 = 308
KpV = nRT
= 99.7×10³×V= 4.30×8.31×308V
=(4.30×8.31×308)/(99.7×10³3 )V
= 0.11 m³
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Plz help me well mark brainliest if Correct!!...
Answer:
C
Explanation:
Answer:
C
Explanation:
The specific place where an organism lives is called its habitat.
10. Which of the following is an example of a
chemical change?
A. burning a scented candle
B. cutting an apple into slices
C. freezing liquid water into an ice cube
D. melting a stick of butter to pour over popcorn
To make a solution for an experiment, Gunther needs to add 40 g of a solute to 100 g of water. When making the solution at room temperature, he could only add 34 grams before the solute settled out.
What could he do to dissolve the remaining 6 grams of the solute?
Answer:
B. Heat the solution, dissolve the solute, and let the solution cool verifying nothing settled out.
Explanation:
To dissolve more solute, the solution has been heated at a high temperature, and the cooling has been observed to verify proper dissolution.
The solubility of the compound has been the ability of the solvent to dissolve the solute molecules. For the solution formation, the intermolecular forces between the solute molecules have been broken in order to sustain the interaction between the solute and the solvent molecules,
The interaction between solute and solvent molecules results in the dissolution of the solute in the solvent.
When Gunther dissolves the 34 grams, of solute, the energy of the solvent molecules has been enough to break the solute interactions and dissolve the solute molecules.
However, in order to dissolve more molecules, the solvent molecules are provided with the energy that has been able to increase the kinetic energy of the solvent for the dissolution of more solute.
The kinetic energy of the solvent has been increased with the increase in the temperature, thereby adding to the more dissolution of the solute.
Thus, to dissolve more solute in the solvent, the solution has been heated at a high temperature, and the cooling has been observed to verify the absence of precipitate thereby proper dissolution.
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Calculate the mass percent composition of nitrogen in each nitrogen containing compound
Mass percent of a compound=(mass of element in molecule/total mass of compound)×100 (a) 63.64%
What is mass percentage composition ?We use the concept of mass percentage composition to explain the concentration of an element in a compound or a component in a combination. This word refers to the overall percent by mass of each element present in a compound.
In chemistry, a compound's percent composition is calculated by dividing its total amount of each elements by the compound's total amount, multiplied by 100. The following formula determines an element's percentage composition:
(gE/gT) = %CE 100
Here, %CE stands for the element's composition in percent.
How to calculate the percentage of each element by mass makes up each compound?
To get the mass percent of an element in a compound, multiply the result by 100 after dividing the mass of the element in 1 mole of the compound by the compound's molar mass.
Calculating total mass of HNO3
= 1 x 1 + 14 x 1 + 16 x 3
= 1 + 14 + 48
= 63
Calculating the mass percentage of Nitrogen in HNO3
= 1/63 x 100
= 1.586 %
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If 0.034 moles of potassium nitrate were formed how many moles of lead (II) nitrate did you start
with?
Answer:
0.017 mole of Pb(NO₃)₂.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
2KOH + Pb(NO₃)₂ —> 2KNO₃ + Pb(OH)₂
From the balanced equation above,
1 mole of Pb(NO₃)₂ reacted to produce 2 moles of KNO₃.
Finally, we shall determine the number of mole of Pb(NO₃)₂ required to produce 0.034 mole of KNO₃. This can be obtained as follow:
From the balanced equation above,
1 mole of Pb(NO₃)₂ reacted to produce 2 moles of KNO₃.
Therefore, Xmol of Pb(NO₃)₂ will react to produce 0.034 mole of KNO₃ i.e
Xmol of Pb(NO₃)₂ = 0.034 / 2
Xmol of Pb(NO₃)₂ = 0.017 mole.
Thus, 0.017 mole of Pb(NO₃)₂ is needed for the reaction.