Two properties are :
Bromcresol green is useful as an acidity indicator because it changes to yellow as the pH becomes more acidic
Also, the bromcresol green protons are easily dissociated making the color change visible and relatively quick.
Why is bromocresol green used as an indicator?
Bromocresol green (BCG) is a dye of the triphenyl methane family (triarylmethane dyes). It belongs to a class of dyes called sulfonephthaleins. It is used as a pH indicator in applications such as growth mediums for microorganisms and titrations.
How does a pH indicator work?
pH indicators detect the presence of H+ and OH-. They do this by reacting with H+ and OH-: they are themselves weak acids and bases. If an indicator is a weak acid and is colored and its conjugate base has a different color, deprotonation causes a color change.
What is chemical change and physical change?
Physical changes are reversible and do not produce a new substance. Chemical changes result in the production of a new substance and cannot be reversed.
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A sparingly soluble metal fluoride with formula mf2, where m is an unknown metal, has a ksp = 6. 65 x 10-6. calculate the concentration of f- in solution
A sparingly soluble metal fluoride with formula MF₂, where m is an unknown metal, has a Ksp = 6.65 x 10⁻⁶. The concentration of F⁻ in solution 2.36 x 10⁻³M
Ksp is called the Molar solubility product and S is the Molar solubility of an ion in a solution.
According to given formula, the dissociation of metal fluoride MF₂ occurs as follows in aqueous solution:
MF₂ ------> M⁺² + 2F⁻
S 2S
Ksp = [S] [2S]²
Ksp = 4S³
Given, Ksp = 6.65 x 10⁻⁶
On substituting,
6.65 x 10⁻⁶ = 4S³
S³ = 1.66 x 10⁻⁶
S = 1.18 x 10⁻³
So, Solubility of F⁻ ion = 2S
Solubility of F⁻ ion = 2(1.18 x 10⁻³)
Solubility of F⁻ ion = 2.36 x 10⁻³
Since Molarity of the ions is equal to the solubility of the ion in aqueous solution.
Hence, the concentration of F⁻ ion is 2.36 x 10⁻³M.
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When an allergen binds with ige antibodies on mast cells, resulting in release of chemical mediators, this reaction is called:_________
When an allergen binds with IgE antibodies on mast cells, resulting in release of chemical mediators, this reaction is called Type I reactions.
The Type I reactions is also known as immediate hypersensitivity reaction.
This reaction involve immunoglobulin E ( IgE ) - mediated release of histamine and other mediators from mast cells and basophils .
Examples : anaphylaxis and allergic rhinoconjunctivitis.
The IgE molecules bind to high - affinity receptors on the surface of mast cells and basophils and the subsequently cross-linking of these molecules with the allergen releases performed and newly synthesized mediators.
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What two effects do impurities have on the melting point of an organic compound and why?
The two effects do impurities have on the melting point of an organic compound are given as ,
They tend to lower the overall melting point of the compound versus the value for he pure material .They ends to increase the range of the melting point values .The impurities decreases the melting point of the substance of organic compounds . This is because there are unwanted particles which weaken the lattice structure of the solids crystal due to which it become less stable and melts before its original melting point.
Example : Let take a clay and add dirt hen it breaks easily from the points where there is dirt . This is essentially what happens with impurities
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How many milliliters of 10. 5 m hcl(aq) are needed to prepare 225. 0 ml of 1. 00 m hcl(aq)?
There are 21.42 milliliters of a 10. 5 M HCl(aq) are needed to prepare 225. 0 ml of 1. 00 M HCl(aq)
Calculation,
The formula for the dilution of a solution is given as:
[tex]M_{1} V_{1} =M_{2} V_{2}[/tex]
Where M is molarity and V is the volume of the solution in liters ( L ).
Given data,
[tex]M_{1}[/tex] = 10. 5 M
[tex]V_{1}[/tex] = ?
[tex]M_{2}[/tex] = 1. 00 M
[tex]V_{2}[/tex] = 225. 0 ml
10. 5 M × [tex]V_{1}[/tex] = 1. 00 M×225. 0 ml
[tex]V_{1}[/tex] in milliliters = 1. 00 M×225. 0 ml / 10. 5 M = 21.42 ml
Volume in milliliters is 21.42 ml .
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If the titration of h2po4− in a urine sample was continued until all of the acid in the solution was neutralized, how many equivalents of naoh would be needed to fully neutralize the solution?
Two equivalents of NaOH are needed to fully neutralize the solution.
What is a neutralization reaction?A neutralization reaction involves the reaction of an acid and a base to form salt and water. The reaction is exothermic in nature.
For example,
[tex]HCl (aq) + NaOH(aq)\rightarrow NaCl(aq) + H_2O (l)[/tex]
During the titration of [tex]H_2PO_4^-[/tex] it gives [tex]2H^+[/tex].
[tex]H_2PO_4^- \rightarrow 2H^+ +PO_4^3^-[/tex]
To neutralize these [tex]2H^+[/tex], 2 [tex]OH^-[/tex] is needed which come from 2 equivalents of NaOH
[tex]2NaOH \rightarrow2 Na^+ +2OH^-[/tex]
Therefore, 2 equivalents of NaOH are needed
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A quantity of an ideal gas is compressed to half its initial volume. the process may be adiabatic, isothermal or isobaric. the greatest amount of work is required if the process is?
the greatest amount of work is required if the process is adiabatic.The correct option is adiabatic.
The process in which heat is constant is called adiabatic process.
The The process in which temperature is constant is called isothermal process.
The process in which pressure is constant is called isobaric process.
The P-V diagram for adiabatic , isothermal and isobaric process is given below.
Work done in process = area encloses by P-V diagram axis . Since area under the curve is maximum for adiabatic process which is shown in the above diagram. So, work done by the gas will be maximum for adiabatic process.
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A compound with chemical formula na2cx3 has formula mass 106 amu .. what is the atomic mass of element x
The element "X" is "O" (oxygen).
Calculation:Given,
Chemical formula = Na₂CX₃
Formula mass = 106 amu
Molar mass of Na = 23 amu
Molar mass of C = 12 amu
To find,
Element X =?
We will equate the equation as follows,
2(23) + 12 + 3(y) = 106
46 + 12 + 3y =106
58 + 3y = 106
3y = 106 - 58
3y = 48
y = 48/3
y = 16
We know that Oxygen has molecular mass of 16. Therefore the element "X" is "O".
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A bug walking on the surface of a puddle is depending on what property of water? high surface tension because of the attraction between water molecules capillary action of water molecules to narrow objects such as bug legs low density of liquid water because of the bent molecular shape adhesion of water molecules to nonpolar structures such as hair and skin
High surface tension because of the attraction between water molecules helps bugs walk on the surface of the water.
How does surface tension help insects walk on water surface?Surface tension is important for insects that walk on water. They would sink without it. When compared to air molecules, water molecules are more strongly attracted to one another. Due to cohesion, this makes them attract and cling to one another strongly in a body of water. The water molecules between the molecules at the water's surface are more strongly attracted to one another because they do not have water molecules surrounding them on all sides.
As a result, there is an inward force that forms a "film" at the surface and causes the water to act as though a thin membrane were covering it. Surface tension is the term for this phenomena.
Surface tension can be used to the advantage of some insect and spider species. They don't break the water's surface when they stand on it because their negligible weight is insufficient to dissipate the force of surface tension. Instead, they make dimples or indentations in the surface with their feet, which rebound to move the insect ahead. This enables them to move swiftly over ponds, lakes, and rivers in search of prey.
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In Birkeland and Eyde's process, ____ is prepared from atmospheric oxygen and nitrogen.
Synthetic fertilizer
What is Birkeland and Eyde's process?
It is a process developed by two scientists - Kristian Birkeland and Sam Eyde - to fix atmospheric nitrogen for the production of fertilizer.
The nitrogen oxide produced is then used in the production of nitric acid and eventually, the production of synthetic fertilizer.
First, nitrogen is fixed into nitrogen oxide:
[tex]N_2 + O_2 --- > 2NO[/tex]
Then, the NO is oxidized:
[tex]2NO + O_2 -- > 2NO_2[/tex]
The nitrous oxide produced is then dissolved in water to form nitric acid:
[tex]3NO_2 + H_2O --- > 2HNO_3 + NO[/tex]
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A sample of 7.70 l of nh3 (ammonia) gas at 22 ∘c and 735 torr is bubbled into a 0.250 l solution of 0.400 mol l−1 hcl (hydrochloric acid). the kb value for nh3 is 1.8×10−5. part a assuming all the nh3 dissolves and that the volume of the solution remains at 0.250 l , calculate the ph of the resulting solution. express your answer numerically to two decimal places. view available hint(s)
The pH of the solution is 9.14
For ammonia:To calculate the amount of hydrogen gas collected, we use the equation given by ideal gas which follows:
PV = nRT
P= Pressure of the gas = 735 torr
V= volume of the gas = 7.70 l
T= Temperature of the gas= 22°C (22+273K) = 295K
R= Gas constant= 62.364 L torr/mol/K
n = number of moles of ammonia = ?
By substituting the values in the above equation, we get:
735×7.70 = n × 62.364 × 295
5659.5 = n × 18397.38
n= 5659.5/18397.38
n= 0.3076
For hydrochloric acid:To calculate the number of moles for given molarity, we use the equation:
Molarity of the solution = [tex]\frac{moles of solute}{volume of solution}[/tex]
Molarity of hydrochloric acid = 0.400 M
Volume of solution = 0.250 L
Putting values in above equation, we get:
0.400= moles of solute/0.250
moles of hydrochloric acid = 0.1 mol
The chemical reaction for ethylamine and HCl follows the equation:
NH3+HCl---> NH4Cl
Initial: 0.316 0.18
Final: 0.136 - 0.18
volume of the solution = 0.250 l
To calculate the pOH of basic buffer, we use the equation given by Henderson Hasselbalch:
pOH = pKb + log([tex]\frac{salt}{base}[/tex])
pOH = pKb + log([tex]\frac{NH4Cl}{NH3}[/tex])
it is given:
pKb = negative logarithm of base dissociation constant of ammonia =
-log(1.8 × [tex]10^{-5}[/tex]) = 4.74
[NH4Cl] = 0.18/0.450
[NH3] = 0.136/0.450
On substituting the values we get,
pOH= 4.74 + log ([tex]\frac{0.18/0.250}{0.136/0.250}[/tex])
pOH = 4.74 + 0.12
pOH= 4.86
pH + pOH= 14
pH= 14-pOH
= 14-4.86
pH = 9.14
pH of the solution = 9.14
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Discuss potential advantages and disadvantages of using water as a solvent in organic chemistry.
Potential advantages of using water as a solvent in organic chemistry are:
Natural resource, easy to obtain, lower cost.Avoiding biomass drying step.Facilitating recovery of inorganics contained in biomass.Disadvantages of using water as a solvent in organic chemistry
Higher critical point, severe reaction conditions.Lower yields of water insoluble bio-oil.The bio-oil with higher oxygen content and lower calorific value.What is the most widely used liquefaction solvent?Water is the most common liquefaction solvent. Not only is water an environmentally friendly solvent that is inexpensive and does not pollute the environment, but it also facilitates the recovery and recycling of inorganic matter contained in biomass in ionic form for eventual use as fertilizers.
Why is water called a universal solvent?Water dissolves many substances and is known as a universal solvent. We learned that, despite being a universal solvent, it can only dissolve polar molecules and that nonpolar molecules, even when mixed with water, form a separate layer.Many researchers around the world have studied the effect of liquefaction solvent type on the liquefaction behaviors of various biomasses, including lignocelluloses, algae, and sewage sludge.Learn more about water as a solvent:
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How much energy is required to melt 10. 0 g of ice at 0. 0°C, warm it to 100. 0°c and completely vaporize the sample?
The 7160 cal energy is required to melt 10. 0 g of ice at 0. 0°C, warm it to 100. 0°C and completely vaporize the sample.
Calculation,
Given data,
Mass of the ice = 10 g
Temperature of ice = 0. 0°C
The ice at 0. 0°C is to be converted into water at 0. 0°CHeat required at this stage = mas of the ice ×latent heat of fusion of ice
Heat required at this stage = 10 g×80 = 800 cal
The temperature of the water is to be increased from 0. 0°C to 100. 0°CHeat required for this = mass of the ice×rise in temperature×specific heat of water
Heat required for this = 10 g×100× 1 = 1000 cal
This water at 100. 0°C is to be converted into vapor.Heat required for this = Mass of water× latent heat
Heat required for this = 10g ×536 =5360 cal
Total energy or heat required = sum of all heat = 800 +1000+ 5360 = 7160 cal
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How many calories (not joules) are given off when 85 gram of steam condenses to liquid water?
45,849 calories are given off when 85 gram of steam condenses to liquid water.
Vaporization is always a highly endothermic (heat-absorbing) process because you must break all the intermolecular interactions present inside of the liquid phase.
So,
Q = mass × heat of vapourization
Q = m×ΔH[tex]_{vap}[/tex]
Q = 85 × 539.4
Q = 45,849 cal
Therefore, 45,849 calories are given off when 85 gram of steam condenses to liquid water.
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number of atoms in 10g of compound is 30.066×10^23. find the molecular mass of compound?
The molecular mass of a 10g compound that has 30.066 × 10²³ atoms is 2.00g/mol.
How to calculate molecular mass?The molecular mass of a substance can be calculated by dividing the mass of the substance by the number of moles.
molecular mass = mass ÷ no of moles
However, the number of moles of the substance must first be calculated by dividing the number of atoms by Avogadro's number.
no of moles = 30.066 × 10²³ ÷ 6.02 × 10²³
no of moles = 4.99moles
molecular mass = 10g ÷ 4.99 moles = 2.00 g/mol
Therefore, the molecular mass of a 10g compound that has 30.066 × 10²³ atoms is 2.00g/mol.
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2. 109×103 g of ethylene glycol, c2h4(oh)2, are dissolved in 2. 40×103 g of water. what is the mole fraction of ethylene glycol?
The mole fraction of ethylene glycol is 0.203.
What is a mole fraction?The mole fraction represents the number of moles of a specific component divided by the total number of moles present in the given solution.
It is a method of expressing the concentration of a solution
Mole fraction can be represented by x. Let a solution consists of components A and B then, the mole fraction is
[tex]Mole fraction of solute, n_A = \frac{n_A}{n_A+n_B}[/tex]
[tex]Mole fraction of solvent, n_B = \frac{n_A}{n_A+n_B}[/tex]
The molar mass of ethylene glycol = 62 g
Given the mass of ethylene glycol = 2.109 x 10³ g
The molar mass of water = 18 g
Given the mass of water= 2.40×10³ g
No moles of ethylene glycol, [tex]n_A[/tex] = [tex]\frac{2.109 \times 10^3 g}{62 g}[/tex]
=34.02
No of moles of water, [tex]n_B[/tex] = [tex]\frac{2.40 \times 10^3 g}{18 g}[/tex] = 133.33
Mole fraction of ethylene glycol = [tex]x = \frac{n_A}{n_A +n_B}[/tex] = [tex]\frac{34.02}{34.02+133.33} = \frac{34.02}{167.35}[/tex]
= 0.203
Hence, The mole fraction of ethylene glycol is 0.203
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What is the correct reading of the temperature in the pictured thermometer? make sure to report your reading with the appropriate significant figures.
36°C
The correct reading of the temperature in the pictured thermometer is 36°C.
What is a thermometer?Thermometer is a device that measures temperature. Specifically speaking one that has a sensor placed inside a metal probe that measures temperature changes by changing electrical resistance.How does a thermometer work?In a mercury thermometer, a glass tube is filled with mercury, and the tube is labelled with a standard temperature scale. The mercury expands and contracts as the temperature changes, allowing the temperature to be read from the scale. The temperatures of the body, liquid, and vapor can all be determined with mercury thermometers.What are thermometers and how do they differ?Thermometer Types:laboratory thermometer electronic thermometer IR thermometer for the ears. mercury-filled thermometerExactly who made the thermometer?The thermometer as a temperature measurement tool is usually acknowledged to have been created by the Italian Santorio Santorio (1561-1636), who is credited with adding a scale to an air thermoscope at least as early as 1612.To learn more about thermometer visit:
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Arrange the procedural steps, from start to finish, that are required for the correct use of an automatic micropipettor.
Steps that are required for the correct use of an automatic micropipettor -
1. ensure that the pipette is adjusted to discharge the proper V
2. depress the knob until you reach the point of first resistance.
3. dip the tip of the pipette into the solution
4. gradually depress the plunger to suck solution into the tip
5. Remove the tip from the solution and put it on the inside wall of the container into which the solution to be dispersed.
6. again depress the knob to the first point of resistance
7. After a brief pause, depress the knob as far as it will go.
What is the benefit of an automated pipette?Pipettes that are automated can eliminate the need for manual work and provide a variety of benefits. The most obvious benefit is increased throughput, since automation frees up time and effort for other activities. Another advantage is increased repeatability.
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Select the correct answer from each drop-down menu. how does the equilibrium change to counter the removal of a in this reaction? a b ⇌ ab the equilibrium . simultaneously, there’s an increase in the reaction.
a b ⇌ ab
The equilibrium Shifts left simultaneously, there’s an increase in the Reverse reaction.
When the addition of the reactant in reaction system then the equilibrium will shift to the right (forward) direction of the reaction.
What happens if the equilibrium shifts to the right?
The overall reaction will shift in a way that reduces the system's stress. Therefore, if one of the reactants is under more stress, the equilibrium will move to the right to eliminate some of that reactant.What does it mean when equilibrium lies to the left?
Yes, "to the left" does relate to a balance expression's left side.When we say that an equilibrium is "to the left," we mean that the educt or reactant is preferred, meaning that there is more H2O present than H3O+ or OH.
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A molecular orbital that decreases the electron density between two nuclei is said to be ____.
a. nonpolar
b. antibonding
c. pi-bonding
d. hybridized
e. bonding
A molecular orbital that decreases the electron density between two nuclei is said to be antibonding.
The bonding orbital, which would be more stable and encourages the bonding of the two H atoms into [tex]H_{2}[/tex], is the orbital that is located in a less energetic state than just the electron shells of the separate atoms. The antibonding orbital, which has higher energy but is less stable, resists bonding when it is occupied.
An asterisk (sigma*) is placed next to the corresponding kind of molecular orbital to indicate an antibonding orbital. The antibonding orbital known as * would be connected to sigma orbitals, as well as antibonding pi orbitals are known as [tex]\pi[/tex]* orbitals.
Therefore, molecular orbital that decreases the electron density between two nuclei is said to be antibonding.
Hence, the correct answer will be option (b)
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According to the iupac convention for chemical naming, which part of a hydrocarbon is selected as the main chain for a hydrocarbon chain?
Answer:
The longest continuous chain
Explanation:
Which pair of compounds is soluble in water?
a. lii and ca(no3)2
b. kno3 and caco3
c. hg2br2 and hg2i2
d. cus and na2s
Pair of LiI and Ca(NO3)2 is soluble in water.
Here LiI stands for lithium iodide and Ca(NO3)2 stands for Calcium Nitrate.
Water's polarity, which is the unequal sharing of electrons among its atoms, is what allows it to be such a great solvent. Typically, water is held together through this polarity of partial positive and negative charges. Positive is attracted to negative, making a cohesive structure. When polar compounds or ions are added to water, they break up into smaller components, or dissolve, to become part of the solution. The water's partial charges attract different parts of the compound, making them soluble in water.
Polar Molecules
Similar to ions, polar molecules are able to dissolve in water. Like water, polar molecules have partial positive and negative charges. The attraction between opposite partial charges helps polar molecules dissolve in water.
Water doesn't have a full positive or negative charge; instead, it possesses a partial positive and partial negative charge. This is because oxygen is a lot more electronegative than hydrogen. This means that oxygen draws more electrons to it than the hydrogen does. Since more electrons are moving towards the oxygen, it has a slightly higher negative charge than water's hydrogen atoms.
Let's look at another simple example: a carbon-fluorine bond. Since fluorine is more electronegative than carbon, it draws more electrons over to it, making it partially negative.
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Compared to a solution with a ph value of 7, a solution with a thousand times greater hydronium ion concentration has a ph value of.
Answer:
pH of 4
Explanation:
Upon comparing a solution with a pH value of 4 and that having a pH of 7, you will realize that it has a pH difference of 3 although the concentration of ions of hydrogen having a pH of 7 is 1000 times greater than being at a pH of 4.
The oxygen consumption rate of a 100 kg seal is 1 ml/(g h). assuming that it has oxygen stores of 7 liters, how many minutes can it dive before running completely out of oxygen?
Oxygen is the crucial gas required for an organism to carry out the cellular process. The seal can dive for 4 minutes before it runs out of oxygen. Thus, option a is correct.
What is oxygen consumption?Oxygen is the most vital element of the organism that is required by almost all cellular and metabolic activities. It is inhaled by the respiratory system and passed to cells and tissues through the circulatory system.
Given,
Mass of seal = 100 kg = 100000 gm
Rate of oxygen consumption (r) = 1 ml/ (gh)
The volume of the stored O₂ = 7000 mL
The time (t) is calculated as,
t = V ÷ mr
Substituting the values above,
t = 7000 ÷ 100000 × 1
= 0.07 hour
In minutes it will be given as,
0.07 × 60 = 4.2 minutes
Therefore, option a. 4 minutes is the time till the seal can remain underwater without oxygen.
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Your question is incomplete, but most probably your full question was, The oxygen consumption rate of a 100 kg seal is 1 ml/(g h). assuming that it has oxygen stores of 7 liters, how many minutes can it dive before running completely out of oxygen?
4 minutes45 minutes700 minutes4192 minutesA 21. 2-l sample of nitrogen at 3. 65 atm and 22°c is simultaneously expanded to 62. 6 l and heated to 34°c. what is the new pressure of the gas?
a. a. 349 atm
b. 235 atm
c. 1. 19 atm
d. 1. 29 atm
e. 1. 91 atm
Then the new pressure of the sample of nitrogen is 1.28 atm
So, option D is correct one.
Calculation,
Formula used : [tex]P_{1} V_{1} /T_{1} =P_{2} V_{2}/T_{2}[/tex] (i)
Where , P is pressure and V is the volume
Given data,
[tex]P_{1}[/tex] = 3. 65 atm
[tex]V_{1}[/tex] = 21. 2 L
[tex]P_{2}[/tex] =
[tex]V_{2}[/tex] = 62. 6 L
[tex]T_{1}[/tex] = 22°C = 22+273 = 295 K
[tex]T_{2}[/tex] = 34°C = 34 +273 = 307 K
Putting the value of all data given in equation (i) we get,
3. 65 atm × 21. 2 L/295 K = [tex]P_{2}[/tex] × 62. 6 L / 307 K
[tex]P_{2}[/tex] = 3. 65 atm × 21. 2 L × 307 K/295 K × 62. 6 L = 1.28 atm
Then the new pressure the sample of nitrogen is 1.28 atm
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A 8.5-liter sample of a gas has 1.2 mole of the gas. if 0.65 mole of the gas is added, what is the final volume of the gas? temperature and pressure remain constant. 13 liters 14 liters 18 liters 21 liters
13 liters is the correct answer
13 liters is the final volume of the gas when the temperature and pressure remain constant.
v1/n1 = v2/n2
where,
v1 = initial volume = 8.5 liter
n1= initial mole of gas = 1.2 mole
n2= final mole of gas = 1.2+0.65= 1.85 mole
v2= final volume = ?
8.5 L/1.2 mol = v2/1.85 mol
7 L x 1.85 mol = v2/1.85 mol x 1.85 mol
13 L = v2
v2= 13 liter
What is a mole?A mole is an SI unit used to measure significant numbers of subatomic particles, such as atoms, molecules, or smaller particles. Any substance has an Avogadro number of molecules in a mole. The value of the Avogadro number is 6.02214076 × [tex]10^{23}[/tex].How much is a mole of gas?
22.4 L
At STP (Standard Temperature and Pressure = 0 °C, 1 atm), an ideal gas has a volume of 22.41 L/mol.
What makes something a mole?Chemists use the term "mole" because atoms, molecules, and other particles are all very small and require a large amount to even weigh them. A mole is a measurement of the number of particles present, not their mass.To learn more about mole of gas visit:
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When an electron in a hydrogen atom jumps from an orbital farther from the nucleus to an orbital closer to the nucleus, it?
When an electron in a hydrogen atom jumps from an orbital farther from the nucleus to an orbital closer to the nucleus, the energy is emitted.
The energy of electron decreases. When it goes, the electron release a photon of electromagnetic energy.
When an electron jumps from higher energy orbital to lower energy orbital, the difference in the energies of these two orbitals is radiated as quantum.
E = hc/wavelength
The photon is emitted with the electron moving from higher energy level to lower energy level.
The wavelength of emitted radiation would be (27/32) × wavelength.
Thus we concluded that the energy of photon is exact energy that is lost by the electron moving to its lower energy level.
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2H2O2 → 2H2O+O2+196.6 kj.
Hydrogen peroxide decomposes according to the reaction above. How much heat is released during the reaction when 5.0 moles of H2O2 decompose?
2mol of Hydrogen peroxide releases 196.6KJ heat
1mol releases
196.6/298.35mol releases
5(98.3)491.5KJAnswer: 491.5
Explanation:
Hope this helps :)
The density of lithium is 0. 546 g/cm3. what volume is occupied by 3. 66 x 10 23 atoms of lithium?
The volume occupied by 3.66 x [tex]10^{23}[/tex] atoms of lithium is 7.73 [tex]cm^3[/tex]
What is Density?The density of a substance is defined as the mass of the substance per unit volume. It is often denoted by the symbol ρ
The density of a substance is given by,
[tex]\rho = \frac{m}{V}[/tex]
The mass of a substance is the measure of the amount of matter present in it. It is generally measured in grams (g) or kilograms (kg).
The volume of a substance is defined as the amount of 3D space occupied by it.
What is Mole Concept?It is a concept which uses mole as a unit to measure the number of atoms, molecules or ions.
A mole is defined as the amount of substance which has the same number of elementary particles as there are atoms in 12 grams of [tex]\ce{^{12}C}[/tex]
1 mole = Avogadro's number = 6.022 x [tex]10^{23\\[/tex] atoms
Steps to find out the volumeMolar Mass of Lithium = 6.94 g/mol
1 mole of Lithium has 6.022 x [tex]10^{23}[/tex] atoms
3.66 x [tex]10^{23}[/tex] atoms of lithium has molar mass = [tex]\frac{6.94 g}{6.022\times10^{23} } \times 3.66 \times 10^{23}[/tex]
[tex]m = 4.218 g[/tex]
Substitute in density formula,
[tex]\rho = \frac{m}{V}[/tex]
[tex]V = \frac{m}{\rho}[/tex]
[tex]=\frac{4.218g}{0.546g/cm^3}[/tex]
= 7.73 [tex]cm^3\\[/tex]
Therefore, 3.66 x [tex]10^{23}[/tex] atoms of lithium occupies 7.73 [tex]cm^3\\[/tex] of volume.
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Hypothesis: How will molecular size affect the rate of evaporation and how will this correlate
with temperature change? Why does molecular size affect evaporation rate?
A molecular size affects the rate of evaporation when the larger the intermolecular forces in a compound, the slower the evaporation rate and this correlates with temperature change.
Molecular size seems to have an effect on evaporation rates in that the larger a molecule gets or grows from a base chemical formula, its evaporation rate will get slower.
What is the molecular size?This is a measure of the area a molecule occupies in three-dimensional space as this relates to the physical size of an individual molecule.
Hence, we can see that a molecular size affects the rate of evaporation the larger the forces, the lower the rate.
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How do different glycosidic bonds contribute to the properties of different sugars?
When the hemiacetal of a saccharide (or a molecule made from a saccharide) combines with the hydroxyl group of another chemical, such as alcohol, a glycosidic bond, also known as a glycosidic linkage, is formed. Only sugars in cyclic forms, which have an anomeric carbon and can create a glycosidic bond, may do so.
The glucose units of glycogen, the main type of energy storage in animal cells, are connected by glycosidic linkages. They are the bonds that make up the strong exoskeletons of beetles, crabs, and lobsters as well as the cellulose that makes up the woody sections of plants and trees.
A sugar molecule connected to another molecule via an ether group is the outcome of a glycosidic connection. A chemical compound called an ether, which consists of an oxygen atom bound to two carbon atoms, is less reactive than other chemical compounds like alcohols. Glycosides are therefore typically more stable than free sugars.
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