Given the freezing-point depression for a solution is 2. 5 °C and the cryoscopic constant is 4.5 °c/m, the molality of the solution is 0.56 m.
What is the freezing-point depression?Freezing-point depression is a drop in the temperature at which a substance freezes, caused when a smaller amount of another, non-volatile substance is added.
The freezing-point depression for a solution is 2. 5 °C. We can calculate the molality of the solution using the following expression.
ΔT = Kf × b
b = ΔT / Kf = 2.5 °C / (4.5 °C/m) = 0.56 m
where,
ΔT is the freezing-point depression. Kf is the cryoscopic constant of the solvent.b is the molality of the solution.Given the freezing-point depression for a solution is 2. 5 °C and the cryoscopic constant is 4.5 °c/m, the molality of the solution is 0.56 m.
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The molality of a solution will be 0.56 m. if the freezing point depression for a solution is 2.5° C.
What is molality?Molality is the measure of the moles of any solute in a solution per unit kg of the solvent.
Given, the freezing-point depression for a solution is 2. 5 °C
The kf is 4.5° c/m
[tex]\rm \Delta T = Kf \times b\\\\b = \dfrac{\Delta T}{kf} \\\\b = \dfrac{2.5^ \circ C}{4.5 \circ C/m} = 0.56 m[/tex]
Where T is freezing point depression
kf is cryoscopic constant of the solvent
b is molality of the solution
Thus, the molality of the solution is 0.56 m.
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What current (in a) is required to plate out 2. 96 g of nickel from a solution of ni2 in 27. 12 minutes?
The current required to plate out 2.96 g of nickel from the solution of Ni²⁺ in 27.12 minutes is 5.95 A
Balanced equationWe'll begin by writing the balanced equation showing the number of faraday required to plate nickel. This is given below
Ni²⁺ + 2e —> Ni
Molar mass of Ni = 59 g/mol
Mass of Ni from the balanced equation = 1 × 59 = 59 g
Number of faraday = 2 F
1 faraday = 96500 C
2 faraday = 2 × 96500 = 193000 C
SUMMARY
From the balanced equation above,
59 g of Nickel was deposited by 193000 C of electricity
How to determine the quantity of electricityFrom the balanced equation above,
59 g of Nickel was deposited by 193000 C of electricity
Therefore,
2.96 g of Nickel will be deposited by = (2.96 × 193000) / 59 = 9682.71 C of electricity
How to determine the current Quantity of electricity (Q) = 9682.71 CTime (t) = 27.12 mins = 27.12 × 60 = 1627.2 sCurrent (I) =?I = Q / t
I = 9682.71 / 1627.2
I = 5.95 A
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The current required to plate out 2. 96 g of nickel from a solution of ni2 in 27. 12 minutes is 5.95 ampere.
What is current?Current is a charged particle moving through an electrical conductor.
The equation is [tex]\rm Ni^2^+ + 2e = Ni[/tex]
step 1: calculate the mass of Ni
Molar mass of Ni is 59 g/mol
59 × 1 = 59 g
Step2: calculate the number of Faraday
no. of Faraday is 2F
1 Faraday = 96500 C
then, 2 Faraday is equal to 2 × 96500 = 193000 C
Step 3: calculate the quantity of electricity
59 g of Nickel is deposited by, 193000 C of electricity
So, for 2.96 g of nickel
[tex]\dfrac{2. 96\;g \times 193000}{59} = 9682.71 \;C[/tex]
Step4: calculate the current:
Electricity Q = 9682.71 C
Time = [tex]27.12 \times 60 = 1627.2 \;s[/tex]
To find current
[tex]I = \dfrac{Q}{t} \\\\I = \dfrac{9682.71 }{1627.2}\\I = 5.95 A[/tex]
Thus, the current required is 5.95 ampere.
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nitrogen gas reacts with oxygen gas to produce nitrogen dioxide gas
Answer:
answer is nitrogen dioxide
The chemical equation shows iron(iii) phosphate reacting with sodium sulfate. 2fepo4 3na2so4 right arrow. fe2(so4)3 2na3po4 what is the theoretical yield of fe2(so4)3 if 20.00 g of fepo4 reacts with an excess of na2so4? 26.52 g 53.04 g 150.8 g 399.9 g
Percentage yield tells the percentage ratio of actual to theoretical yield. The theoretical yield of iron(III) sulfate is 26.52 g.
What is a theoretical yield?The theoretical yield is the product formation from the complete modification of the limiting reagent in a chemical reaction.
The balanced chemical reaction is shown as,
[tex]\rm 2FePO_{4} + 3Na_{2}SO_{4} \rightarrow Fe_{2}(SO_{4})_{3} + 2Na_{3}PO_{4}[/tex]
Moles of ferric phosphate is calculated as:
[tex]\begin{aligned} \rm n &= \rm \dfrac{mass}{molar \; mass}\\\\&= \dfrac{20}{150.82}\\\\&= 0.1326\;\rm mol\end{aligned}[/tex]
From the reaction,
[tex]\dfrac{1 \;\rm mol \; Fe_{2}(SO_{4})_{3} }{2 \;\rm mol \; FePO_{4}}&= \dfrac{\rm X}{ 0.1326 \;\rm mol \; FePO_{4}}[/tex]
Solving for X:
[tex]\begin{aligned} \rm X &= (\dfrac{0.1326}{2}) \times 1 \rm \; mol\\\\&= 0.0663 \;\rm mol \;Fe_{2}(SO_{4})_{3}\end{aligned}[/tex]
Calculating mass from moles:
[tex]\begin{aligned}\rm mass &= \rm moles \times molar \rm \; mass\\\\&= 0.0663 \;\rm mol \times 399.88 \;\rm g/mol \\\\&= 26.51\;\rm g\end{aligned}[/tex]
Therefore, option A. 26.52 gm is the mass of iron(III) sulfate.
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Answer:
A) 26.52
Explanation:
Round the mmHg readings to the nearest whole number. Round the kPa readings to the nearest tenth. Round the atm readings to the nearest hundredth. Convert a pressure of 2.76324 kPa to _____ torr
Given the pressure in KPa, the value of the pressure reading in torr obtained is 20.73 torr
Conversion scale101.325 KPa = 760 torr
Data obtained from the question Pressure (KPa) = 2.76324 KPa Pressure (torr) =? How to determine the pressure in torrThe value of the pressure in torr can be obtained as illustrated below:
101.325 KPa = 760 torr
Therefore,
2.76324 KPa = (2.76324 × 760) / 101.325
2.76324 KPa = 20.73 torr
Thus, 2.76324 KPa is equivalent to 20.73 torr
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Mass defect for oxygen-16 = 0. 13261 amu How many kilograms does the mass defect represent? 1. 66 × 10-27 kg 2. 20 × 10 -28 kg 3. 0 × 108 kg 8. 24 x 1025 kg.
Mass defect for oxygen-16 = 0. 13261 amu, in the kilograms the mass defect equals to 2.20 × 10⁻²⁸ kg.
What is mass defect?Mass defect is the difference between the mass of of an whole atom and the combined mass of its individual particles present in that atom.
We know that, 1 amu = 1.6 × 10⁻²⁷ kg
Given that, mass defect for oxygen-16 = 0.13261 amu
To calculate this defect in terms of kilograms, we have to convert into kg unit as:
0.13261 amu = 0.13261 amu × 1.6 × 10⁻²⁷ kg/amu
0.13261 amu = 2.20 × 10⁻²⁸ kg
Hence option (2) is correct.
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Describe how to express the rate of a chemical reaction
Answer: A “rate” is a measure of the speed of any change that occurs within an interval of time In chemistry, reaction rate is expressed as the amount of reactant changing per unit time. Example: 3 moles/year, or 5 grams/second
Explanation: A “rate” is a measure of the speed of any change that occurs within an interval of time In chemistry, reaction rate is expressed as the amount of reactant changing per unit time. Example: 3 moles/year, or 5 grams/second
Answer:
Chemical reaction rates are usually expressed as the concentration of reactant consumed or, the concentration of product formed per unit time.
Explanation:
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2. Calcium hydroxide, used to neutralize acid spills, reacts with hydrochloric acid to produce calcium
chloride and water. If you spilled 85.0 grams of hydrochloric acid and put 120 grams of calcium
hydroxide on it, which one is the limiting reactant? Answer:
Answer:
hydrochloric acid (HCl)
Explanation:
balanced equation: Ca(OH)2+2HCl -> CaCl2+2H2O
85.0/36=2.33 mol HCl
120/74=1.62 Ca(OH)2
2.33 mol HCl x 1 mol CaCl2/2 mol HCl = 1.165 mol CaCl2
1.62 mol Ca(OH)2 x 2 mol CaCl2/1 mol Ca(OH)2 = 3.24 mol CaCl2
a.
Which of the following correctly describes the composition of an electromagnetic wave?
a transverse electric wave and a magnetic C. a transverse electric wave and a magnetic
transverse wave that are parallel and are
transverse wave that are parallel and are
moving in the same direction
moving at right angles to each other
b. a transverse electric wave and a magnetic d. a transverse electric wave and a magnetic
transverse wave that are perpendicular and are transverse wave that are perpendicular and are
moving in the same direction
moving at right angles to each other
Answer:
a transverse electric wave and a magnetic transverse wave that are perpendicular and are moving in the same direction.
Explanation:
hope this helps!
Consider the two‑step synthesis of 2‑hydroxy‑2,4‑dimethylpentanoic acid using the reagents provided
The two step synthesis 2‑hydroxy‑2,4‑dimethyl pentanoic acid of involves compounds as represented in the attached image.
Two step synthesis of organic compoundsFrom the task content:
It therefore follows that the Starting compound A and intermediate compound B are as represented in the attached image.
Compound A is 4-methyl pentan-2-oneRemarks: The reagents provided are, H3O, Potassium cyanide and Hydrogen cyanide.
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0.5mol/dm3 hydrochloric acid is added gradually to a flask containing 20cm3 of 2 mol/ dm3 sodium hydroxide solution.
What is the total volume, in cm3, of the mixture in the flask when the solution is just neutral?
A 30
B 40
C 60
D 100
Answer:
The answer is B which is 40
From the calculations and the data presented, the total volume in the flask is 100cm^3
What is neutralization?A neutralization occurs between an acid and a base to yiled salt and water only.
The reaction equation here is; HCl + NaOH -----> NaCl + H2O. Now, the volume of HCl used is obtained from;
2 * 20 * 1/0.5 * 1 = 80 cm^3
Total volume in the flask = 80 cm^3 + 20cm3 = 100cm^3
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Which goal do all environmental regulations for industry serve?
to protect people and the environment
to limit industrial activities in all industries
to prevent deforestation by lumber companies to reduce greenhouse gas emissions
Answer:
To protect people and the environment.
Explanation:
In an ecosystem, the goal of all environmental regulations is to protect people and the environment.
What is an ecosystem?
Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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1. Which would dissolve faster?
A. individual salt crystals
B. a big block of salt
2. most cases , when temperature increases , solubility
A. increases
B. decreases
3. As agitation increases , the rate at which a solute will dissolve
A. increases
B. decreases
1) A. individual salt crystals
2) A. increases
3) A. increases
hope this helps :)
A solution is defined as the homogeneous mixture which contain one or more solutes in a solvent. The factors which affect the solubility are temperature and pressure. Here individual salt crystals dissolve faster.
What is solubility?The maximum amount of solute which can dissolve in a given quantity of the solvent at a certain temperature is defined as the solubility. It is defined as the property exhibited by a material to dissolve in a given solvent.
The powdered salt found to dissolves faster in a solvent than the salt of larger size. The rate of dissolving is affected by the size of the solute. The faster the solute dissolves if its size is smaller. So the individual salt crystals dissolves faster.
In most cases, generally the solubility found to decrease with the increase of temperature. When the temperature increases, the kinetic energy of the molecules increases and thereby decreases the intermolecular force of attraction. The increase in the process of agitation decreases the solubility.
1. The correct option is A
2. The correct option is B
3. The correct option is B
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Identifying balanced and unbalanced forces
Identify the situations that have an u balanced force. Check all that apply
A baseball speeds up as if it falls through the air
A soccer ball is at rest on the ground
An ice skater glides in a she ighr like at a constant speed
A bumper car hit by another car moves off an angle
A bin goes across the room when the air is released
Clouds form when water vapor ____________ out of the air.
Answer:
condenses
Explanation:
change or cause to change from a gas or vapor to a liquid.
How does the actual amount of the amino acid glycine found in stan’s apparatus compare to the amount of glycine in the murchison meteorite?
The amount of the amino acid glycine that is found in Stan’s apparatus is more than that of murchison meteorite.
What is amino acid?It should be noted that amino acid simply means organic compounds that contain both amino and carboxylate.
In this case, the amount of the amino acid glycine that is found in stan’s apparatus is more than that of murchison meteorite. This was depicted by the fraction of the three amino acids in the scenario.
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The actual amount of the amino acid glycine found in Stan’s apparatus is more than the amount of glycine in the Murchison meteorite.
What is amino acid?
Amino acids are the building blocks of proteins. The building blocks of life are amino acids and proteins.
Amino acids remain after proteins are digested or broken down. Amino acids are used by the human body to build proteins that aid the body to Break food down.It should be noted that amino acid simply means organic compounds that contain both amino and carboxylate.In this example, the amount of glycine detected in Stan's equipment is more than that found in the Murchison meteorite. The fraction of the three amino acids in the scenario represented this.
Hence amount of amino acid is more in Stan's apparatus as compared to the Murchison meteorite.
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When people talk about the phrase “blood sugar,” they really mean?
Answer:
Specific chemical sugar glucose
Explanation:
When we say “blood sugar,” we mean the specific chemical sugar glucose. Diabetes is all about glucose. There lots of sugars….table sugar is sucrose, malt sugar is maltose, milk sugar is lactose, and you’ve probably heard of fructose.
Blood sugar, or glucose, is the main sugar found in your blood. It comes from the food you eat, and is your body's main source of energy. Your blood carries glucose to all of your body's cells to use for energy.
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2. 14g of Nitrogen gas and 8.0g of hydrogen react to produce ammonia according to the equation: N2 + 3H2 -- 2NH3 Calculate the mass of hydrogen leftover once the reaction has happened.
a) Identify the limiting reagent in this reaction. Give a reason for your answer.
b) Determine the amount, in moles of the limiting reagent.
c) Determine the amount, in moles of the excess reagent.
d) Determine which reactant will produce the least amount of ammonia.
e) Calculate the amount, in moles of H2, reacted, when the limiting reagent has been used up.
f) Give the mass of the amount of H2 that has reacted
Based on the equation of the reaction, nitrogen is the limiting reagent while hydrogen is the excess reagent.
What is the mole ratio of hydrogen to nitrogen in the formation of ammonia?Hydrogen and nitrogen combines to form ammonia ina mole ratio of 3 : 1 as shown by the equation of the reaction below:
N2 + 3H2 -- 2NH3The number of moles of the reactants in 14g of Nitrogen gas and 8.0g of hydrogen is calculated as follows:
Moles = mass/molar massMolar mass of N_{2} = 14.0 g
Molar mass of H_{2} = 2.0 g
Moles of N_{2} = 14/14.0 = 1 mole
Moles of H_{2} = 8/2.0 = 4 moles
Based on the data above:
The limiting reagent is nitrogen gas as it will be used up while hydrogen will be left over.The moles of nitrogen is 1 moleHydrogen is the excess reagent and 1 mole will be left over 3 moles of hydrogen will react with 1 mole of the nitrogen gas mass of 3 moles of hydrogen is 3 × 2.0 g = 6.0gTherefore, the limiting reagent is nitrogen while hydrogen is the excess reagent.
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A soft drink contains 12.1% sucrose (C12H22O11) by mass. What volume of the soft drink solution in milliliters contains 102.5 g of sucrose? (Assume a density of 1.04 g/mL)
The volume of the soft drink solution in milliliters that contains 102.5 g of sucrose is 11.93mL.
How to calculate volume?The volume of a solution can be calculated by dividing the mass by the density. That is;
Volume = mass/density
According to this question, a soft drink contains 12.1% sucrose (C12H22O11) by mass. This means that the mass of the sucrose is
12.1/100 × 102.5 = 12.40g of sucrose
Volume = 12.40g ÷ 1.04g/mL
Volume = 11.93mL
Therefore, the volume of the soft drink solution in milliliters that contains 102.5 g of sucrose is 11.93mL.
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How many molecules is equal to 46.92 grams of SrF2
Answer:
125.6168064 is the answer
when the concentration of NADH increases while the concentration of NAD+ decreases, will the electrochemical potential increase, decrease, or remain the same
When the concentration of NADH increases while the concentration of NAD+ decreases, the electrochemical potential however will increase
What is electrochemical potential?Electrochemical potential can be defined as a measure of the difference between the average energy of the outermost electrons of the molecule or element in its two valence states.
What is NADP?NADP is a coenzyme and simply has it full meaning as Nicotinamide Adenine Dinucleotide Phosphate
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Which process or processes produce an increase in entropy? i. n2(g) 3h2(g) right arrow. nh3(g) ii. c10h8(g) right arrow. c10h8(s) iii. ch3oh(l) right arrow. ch3oh(aq) i only ii and iii iii only i and iii
Entropy is commonly understood as the system's degree of disorder or unpredictability. The correct option is, (C) (iii) only
What is entropy?Entropy is a thermodynamic number that represents the inability of a system's thermal energy to be converted into mechanical work and is commonly understood as the system's degree of disorder or unpredictability.
The degree of unpredictability of a molecule rises when it transitions from a solid to a liquid state. As a result, the entropy will rise.
Similarly, when we move from a liquid to a gaseous state, the unpredictability of the molecule increases. As a result, the entropy will rise.
However, as we progress from gas to liquid to solid, the degree of molecular randomization reduces. As a result, the entropy will decrease.
Or, to put it another way, the higher the number of moles in a product, the higher the entropy.
(i) [tex]N_2(g)+3H_2(g) \rightarrow 2NH_3(g)[/tex]
Entropy falls in this reaction because the number of moles on the product side is fewer than the number of moles on the reactant side.
(ii) [tex]C_{10}H_8(g) \rightarrow C_{10}H_8(s)[/tex]
Entropy lowers in this process because the degree of randomness of the molecules diminishes as we move from a gas to a solid-state.
(iii) [tex]CH_3OH(l)\rightarrow CH_3OH(aq)[/tex]
Because the methanol liquid dissociated into ions, the number of moles present on the product side is more than the number of moles present on the reactant side, entropy rises in this reaction.
Hence, the correct option is, (C) (iii) only.
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What conditions makes the wind blow faster and stronger?
Larger differences in air pressure over a large area.
Small differences in air pressure over a large area.
Larger differences in air pressure over a small area.
Small differences in air pressure over a small area
Larger differences in air pressure over a small area makes the wind blow faster and stronger.
What is pressure?Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.
There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .
It is a scalar quantity which is related to the vector area element with a normal force acting on it.It is distributed over solid boundaries and across arbitary sections of fluid normal to the boundaries at every point.
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What is responsible for the sharp decrease in ionization energy between the elements with 2 and 3 atomic number? 10 and 11?
please help
pick the right square
Select the correct location on the image. Objects A and B are brought close to each other. Object A will soon become positively charged. Identify the charge that must transfer for this situation to occur.
Answer:
turn it
Explanation:
Accurate information
Answer:
For The first one I think its the + if not try -
For the second one I believe its the first - sign
Explanation:
Calculate the [H+] in a 1.0 M solution of HA
Can anyone help me on this please.
What determines whether atoms will form chemical bonds.
Answer:
The electron arrangement of the outer energy level of an atom determines whether or not it will form chemical bonds.
Explanation:
To what temperature must a sample of helium gas be cooled from 139ºC to reduce its volume from 3.1 L to 0.71 L at constant pressure?
Taking into account the Charles's law, to 94.36 K or -178.64 °C must a sample of helium gas be cooled from 139ºC to reduce its volume from 3.1 L to 0.71 L at constant pressure.
Charles's lawThis law states that the volume is directly proportional to the temperature of the gas: for a given sum of gas at constant pressure, as the temperature increases, the volume of the gas increases, and as the temperature decreases, the volume of the gas decreases.
In summary, Charles' law is a law that says that when the amount of gas and pressure are kept constant, the ratio between volume and temperature will always have the same value:
[tex]\frac{V}{T} =k[/tex]
Studying two different states, an initial state 1 and a final state 2, it is satisfied:
[tex]\frac{V1}{T1} =\frac{V2}{T2}[/tex]
Temperature of helium gasIn this case, you know:
V1= 3.1 LT1= 139 C= 412 K (being 0 C= 273 K)V2= 0.71 LT2= ?Replacing in Charles's law:
[tex]\frac{3.1 L}{412 K} =\frac{0.71 L}{T2}[/tex]
Solving:
[tex]\frac{3.1 L}{412 K} T2=0.71 L[/tex]
[tex]T2 =\frac{0.71 L}{\frac{3.1 L}{412 K}}[/tex]
T2= 94.36 K= -178.64 °C
Finally, to 94.36 K or -178.64 °C must a sample of helium gas be cooled from 139ºC to reduce its volume from 3.1 L to 0.71 L at constant pressure.
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.
Which molecule is a sugar molecule that can be broken down for energy?
Proteins
Peptides
Amino acids
Carbohydrates
Answer:
Carbohydrates
Explanation:
first of all, I took a quiz and got it right but also Carbohydrates fuel the body and are broken down and made into glucose that can be absorbed into the bloodstream. so when absorbed into the bloodstream they travel in the blood to the body's cells where they are used for respiration.
Explain why air resistance is a contact force and gravity is a non-contact force.
Answer:
The air resistance is a special type of frictional force that acts upon objects as they travel through the air. The force of air resistance is often observed to oppose the motion of an object. This force will frequently be neglected due to its negligible magnitude (and due to the fact that it is mathematically difficult to predict its value). It is most noticeable for objects that travel at high speeds (e.g., a skydiver or a downhill skier) or for objects with large surface areas. Air resistance is a contact force.
The force of gravity is the force with which the earth, moon, or other massively large object attracts another object towards itself. By definition, this is the weight of the object. All objects upon earth experience a force of gravity that is directed "downward" towards the center of the earth. Gravitational force is considered to be a non-contact force because it is an attracting force which does not include contact between the objects to exert force