Answer:
solid
Explanation:
they are all stuck together
Molecules move the slowest in a solid state. This is due to the closely packed arrangement of molecules, which only allows for vibrational motion.
Explanation:In the three states of matter (solid, liquid, and gas), the speed of molecular movement varies based on temperature and arrangement of molecules. In a solid state, molecules are closely packed together and vibrate in fixed positions, thereby having the slowest movement. In contrast, molecules in a liquid state move a bit faster, and in a gas state, they move the fastest as they're free to roam around with little to no restrictions.
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The molecular weight of hemoglobin is 64,500 daltons (= g mol-1).
a. how much oxygen can be bound per g of hemoglobin? express the values as ml per g of hemoglobin, where ml is the volume of o2. r =0.082 l atm mol-1 ok-1, ok =273 + oc. the molar volume of o2 is given as v = nrt/p where p = 1 atm and n= 1 mol; (hint: 1.0 mol x 0.082 l atm mol-1 ok-1 x 273.2 ok / 1 atm = 22.4 l mol-1)
Answer:
Thus, one gram of Hemoglobin carries 1.389 mL of oxygen.
Explanation:
Each hemoglobin molecules carries 4 oxygen molecules.
Given that the molar mass of hemoglobin = 64,5000 g/mol
1 gram of hemoglobin = [tex]\frac{1}{64500}moles[/tex]
Now, no of moles of oxygen carried in 1 mole of hemoglobin = [tex]\frac{1}{64500}* 4 \ \ moles[/tex]
= [tex]6.2016*10^{-5}[/tex] moles
assuming the oxygen is to be an ideal gas; then:
PV = nRT
[tex]V =\frac{nRT}{P}[/tex]
Given that :
[tex]\frac{RT}{P}= 22.4 \ L/mol[/tex]
Then V = [tex]6.2016*10^{-5}[/tex] [tex]*22.4 *1000 \ mol[/tex]
V = 1.389 mL
Thus, one gram of Hemoglobin carries 1.389 mL of oxygen.
which one of these elements was suggested as transition element by Mendeleev?
(a) N
(b)Ni
(c)Ne
(d)none
PLZ ANSWER SOOON
I'LL MARK YOU AS BRAINLIEST
Answer:
The answer is I think None.
A chemical reaction has an energy of activation Ea = 1∙104 J mol-1 at T = 300 K. The first-order rate constant for this reaction was found to be 15.0 s-1. In the presence of a catalyst, the activation energy is reduced to 1∙103 J mol-1. Calculate the pre-exponential factor in the Arrhenius equation
Answer : The pre-exponential factor in the Arrhenius equation is, 14.99 s⁻¹
Explanation :
Using Arrhenius equation,
[tex]K=A\times e^{\frac{-Ea}{RT}}[/tex]
Taking ln on both the sides, we get:
[tex]\ln K=\frac{-Ea}{RT}+\ln A[/tex]
where,
K = rate constant = [tex]15.0s^{-1}[/tex]
Ea = activation energy = 1.104 J/mol
T = temperature = 300 K
R = gas constant = 8.314 J/mole.K
A = Arrhenius constant
Now put all the given values in the above formula, we get the value of \ln a.
[tex]\ln (15.0s^{-1})=\frac{1.104J/mol}{(8.314J/mole.K)\times (300K)}+\ln A[/tex]
[tex]\ln A=2.708s^{-1}[/tex]
[tex]A=14.99s^{-1}[/tex]
Therefore, the pre-exponential factor in the Arrhenius equation is, 14.99 s⁻¹
Partial charges will exist on each atom when a bond exists between two atoms with different electronegativities. Since the atom with a higher electronegativity will have a stronger ability to attract electrons, it will have a partial _________ charge. The atom with a lower electronegativity will have an equal and opposite _________ charge. As the difference in electronegativity increases, the resulting magnitudes of the partial charges will ___________.
Answer:
negative, positive, increase
Explanation:
From the given question,
During the formation of bond, between two atoms with difference between their electronegativity-
The more electronegative atom, will pull the electrons towards itself , and hence acquires a partial negative charge,And,
The less electronegative atom, will acquire a partial positive charge.The more the difference between the electronegativity of the atoms, the more would be the magnitude of partial charge.And, the less would be the difference between the electronegativity of the atoms, the lesser would be the magnitude of partial charge.Atoms with different electronegativities share electrons unequally, leading to partial charges. The more electronegative atom gains a partial negative charge, while the other has a partial positive charge. Larger electronegativity differences intensify these charges.
Explanation:When two atoms with different electronegativities form a covalent bond, the atom with higher electronegativity will attract shared electrons more and will have a partial negative charge. Conversely, the atom with lower electronegativity will have an equal and opposite partial positive charge. As the difference in electronegativity increases, the resulting magnitudes of the partial charges will also increase.
Which is the correct equation for: iron + sulfur → iron (III) sulfide
The correct option is D.
What are Chemical Equations?
They are equations that make use of chemical formulae and symbols to represent chemical reactions. The left-hand side of a chemical equation represents the reactants and the right-hand side represents the products. These entities are separated by a symbol that describes the direction of the reaction. Each reacting entity is also assigned its corresponding stoichiometric coefficient.
What are the 5 types of equations?There are five basic categories given below.
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Which statement defines the heat capacity of a sample?
Answer:
The specific heat capacity of a substance is the heat capacity of a sample of the substance divided by the mass of the sample. Informally, it is the amount of energy that must be added, in the form of heat, to one unit of mass of the substance in order to cause an increase of one unit in its temperature.
Explanation:
More explanation...
The ratio of the heat energy absorbed by a substance to its increase in temperature. Heat capacity is also called thermal capacity. The specific heat or specific heat capacity of a substance is the heat capacity per unit mass, usually measured in joules per kilogram per degree Kelvin.
- Without the statements, I will not be able to give an exact answer. Hope this helps!
Answer:
D) the quantity of heat that is required to raise 1 g of the sample by 1°C (Kelvin) at a constant pressure
Explanation:
on edg
HELP FAST!!!
As energy in the form of heat is added to an ice cube, it begins to melt. Which is a valid claim about what causes melting?
A Heat causes the molecules in the ice cube to expand and forces them apart.
B Heat removes thermal energy from the ice cube and causes it to become liquid water.
CThe additional energy causes the bonds between hydrogen and oxygen in the ice cube to break.
DThe transfer of thermal energy to the ice cube causes its molecules to move faster.
Answer:
Explanation:
D. The transfer of thermal energy to the ice cube causes its molecules to move faster.
Answer:
its A heat causes the molecules in the cube to expand and forces them apart.
Explanation:
True or false: Chemical and physical changes alter matter?
Answer:
False
Explanation:
Chemical changes do change the composition of the substance. However, physical changes do not; physical changes simply alter the physical form of the substance.
For example, a melting ice cube is undergoing a physical change, but its overall composition of H2O isn't changing. It's just changing from a solid form to a liquid form.
Hope this helps!
Answer:
false
Explanation:
A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity. Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding.
Magnesium, the element, is produced commercially by electrolysis from a molten salt (the "electrolyte") using a cell similar to the one. Recall that in an electrolytic cell the anode is given the + sign and the cathode is given the - sign, which is the opposite of what we see in batteries. What half-reaction occurs at the anode in this electrolytic cell?
Answer:
The half-reaction that occurs on the anode of an electrolytic cell is called oxidation.
This can easily be depicted by a chemical reaction as such "Zn(s) = Zn2+ (aq) + (2e-)"
While, the Zinc in this reaction loses two elections. Hence copper gains those electrons and becomes solid.
These reactions occurring on the anode are called positive reactions.
While the reaction that occurs on the cathode is called reduction. This reaction can be represented by this equation "Cu2+ (aq) + 2e- = Cu(s)".
These non-spontaneous reactions occurring in an electrolytic cell together are called redox reactions. These generate electrical energy.
In the electrolytic cell for commercial magnesium production, the half-reaction at the anode (positive electrode) is oxidation, where electrons are lost. If magnesium chloride is the electrolyte, chloride ions are oxidized to form chlorine gas.
Explanation:In the electrolytic cell used for the commercial production of magnesium, the anode is the positive electrode. As it is where oxidation occurs, the half-reaction happening at the anode involves the removal of electrons. The specific half-reaction varies based on the electrolyte used. If pure molten magnesium chloride (MgCl2), a common electrolyte, is used, the half-reaction at the anode would be: Cl- —> Cl2 + 2e- . This equates that chloride ions (Cl-) lose electrons (are oxidized) to form chlorine gas (Cl2).
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A sample of neon gas occupies a volume of 2.8L at 1.8 atm. What would its volume be at 1.2 atm?
Answer:
4.2 L
Explanation:
Use Boyle's Law and rearrange formula.
- Hope this helps! Please let me know if you need further explanation.
To find the volume of the neon gas at 1.2 atm, we can use the combined gas law equation.
Explanation:To solve this problem, we can use the combined gas law equation:
P1V1 / T1 = P2V2 / T2
First, we need to convert the given volume in liters to moles using the ideal gas law equation:
V1 = nRT1 / P1
Then, we can rearrange the combined gas law equation to solve for V2:
V2 = (P2 * V1 * T2) / (P1 * T1)
Substituting the given values, we get:
V2 = (1.2 atm * 2.8 L * 273 K) / (1.8 atm * 273 K) = 1.233 L
Therefore, the volume of the neon gas at 1.2 atm would be 1.233 liters.
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which produces a higher than normal tide?
a Spring Tide or Neal Tide?
and why
Answer:
spring tide
Explanation:
when both the sun and moon aligned th affect of each is added together producing higher than normal tides called SPRING TIDES
Answer:
Spring Tide
Explanation:
In both cases, the gravitational pull of the sun is 'added' to the gravitational pull of the moon on Earth, causing the oceans to bulge a bit more than usual. This means that high tides are higher and low tides are lower than average. These are called 'spring tides.
A small amount wet of hydrogen gas can be prepared by the reaction of zinc with excess hydrochloric acid and trapping the gas produced in an inverted tube initially filled with water. If the total pressure of the gas in the collection tube is 729.7 mmHg at 25 C, what is the partial pressure of the hydrogen
Answer : The partial pressure of the hydrogen is, 705.9 mmHg
Explanation :
According to the Dalton's law of partial pressure,
[tex]P_T=P_{H_2}+P_{H_2O}[/tex]
where,
[tex]P_T[/tex] = total pressure of the gas = 729.7 mmHg
[tex]P_{H_2}[/tex] = partial pressure of the hydrogen gas = ?
[tex]P_{H_2O}[/tex] = partial pressure of the water = 23.8 mmHg (standard value)
Now put all the given values in the above expression, we get:
[tex]729.7mmHg=P_{H_2}+23.8mmHg[/tex]
[tex]P_{H_2}=705.9mmHg[/tex]
Therefore, the partial pressure of the hydrogen is, 705.9 mmHg
what are the three types of nuclear radiation?
alpha particles, beta particles, and gamma rays
alpha particles, beta rays, and gamma rays
alpha rays, beta particles, and gamma rays
alpha rays, beta rays, and gamma particles
alpha ,beta and gamma are nuclear radiation
If you have a heartburn, how you could you safely help the situation
Answer:Eat a light dinner and avoid foods that trigger your heartburn. Don't lie down for at least 2 to 3 hours after you eat. Use blocks or books to raise the head of your bed by 4-6 inches. Or put a foam wedge under your mattress at the head of the bed.
Explanation:
Which has the most thermal energy?
A cup of water at 10°C or a lake at 10°C
Answer:
A lake because it has more mass
Answer:
A lake at 10 degrees C
Explanation: Got it right on Edge 2020
1. The solubility of lead(II) chloride at some high temperature is 3.1 x 10-2 M. Find the Ksp of PbCl2 at this temperature.
2. The Ksp of Al(OH)3 is 1.0 x 10-33. What is the solubility of Al(OH)3 in 0.000010 M Al(NO3)3?
3. A precipitate of lead(II) chloride forms when 3.5 mg of NaCl is dissolved in 0.250 L of 0.12 M lead(II)nitrate.
A. True
B. False
Answer:
1) The solubility product of the lead(II) chloride is [tex]1.2\times 10^{-4}[/tex].
2) The solubility of the aluminium hydroxide is [tex]1.6\times 10^{-10} M[/tex].
3)The given statement is false.
Explanation:
1)
Solubility of lead chloride = [tex]S=3.1\times 10^-2M[/tex]
[tex]PbCl_2(aq)\rightleftharpoons Pb^{2+}(aq)+2Cl^-(aq)[/tex]
S 2S
The solubility product of the lead(II) chloride = [tex]K_{sp}[/tex]
[tex]K_{sp}=[Pb^{2+}][Cl^-]^2[/tex]
[tex]K_{sp}=S\times (2S)^2=4S^3=4\times (3.1\times 10^{-2})^3=1.2\times 10^{-4}[/tex]
The solubility product of the lead(II) chloride is [tex]1.2\times 10^{-4}[/tex].
2)
Concentration of aluminium nitrate = 0.000010 M
Concentration of aluminum ion =[tex]1\timed 0.000010 M=0.000010 M[/tex]
Solubility of aluminium hydroxide in aluminum nitrate solution = [tex]S[/tex]
[tex]Al(OH)_3(aq)\rightleftharpoons Al^{3+}(aq)+3OH^-(aq)[/tex]
S 3S
The solubility product of the aluminium nitrate = [tex]K_{sp}=1.0\times 10^{-33}[/tex]
[tex]K_{sp}=[Al^{3+}][OH^-]^3[/tex]
[tex]1.0\times 10^{-33}=(0.000010+S)\times (3S)^3[/tex]
[tex]S=1.6\times 10^{-10} M[/tex]
The solubility of the aluminium hydroxide is [tex]1.6\times 10^{-10} M[/tex].
3.
[tex]Molarity=\frac{Moles}{Volume (L)}[/tex]
Mass of NaCl= 3.5 mg = 0.0035 g
1 mg = 0.001 g
Moles of NaCl = [tex]\frac{0.0035 g}{58.5 g/mol}=6.0\times 10^{-5} mol[/tex]
Volume of the solution = 0.250 L
[tex][NaCl]=\frac{6.0\times 10^{-5} mol}{0.250 L}=0.00024 M[/tex]
1 mole of NaCl gives 1 mole of sodium ion and 1 mole of chloride ions.
[tex][Cl^-]=[NaCl]=0.00024 M[/tex]
Moles of lead (II) nitrate = n
Volume of the solution = 0.250 L
Molarity lead(II) nitrate = 0.12 M
[tex]n=0.12 M]\times 0.250 L=0.030 mol[/tex]
1 mole of lead nitrate gives 1 mole of lead (II) ion and 2 moles of nitrate ions.
[tex][Pb^{2+}]=[Pb(NO_2)_3]=0.030 M[/tex]
[tex]PbCl_2(aq)\rightleftharpoons Pb^{2+}(aq)+2Cl^-(aq)[/tex]
Solubility of lead(II) chloride = [tex]K_{sp}=1.2\times 10^{-4}[/tex]
Ionic product of the lead chloride in solution :
[tex]Q_i=[Pb^{2+}][Cl^-]^2=0.030 M\times (0.00024 M)^2=1.7\times 10^{-9}[/tex]
[tex]Q_i<K_{sp}[/tex] ( no precipitation)
The given statement is false.
The Ksp of PbCl2 at a given temperature is calculated using the solubility of the compound. For Al(OH)3 in a solution containing Al(NO3)3, the solubility would be influenced by the common ion effect. The potential formation of a PbCl2 precipitate depends on the concentrations of lead(II) and chloride ions.
Explanation:Calculation of Ksp and Solubility
The solubility product (Ksp) represents the equilibrium between a solid and its corresponding ions in a solution. It is a unique value for each soluble compound at a given temperature.
1. Ksp of PbCl2
The dissolution of PbCl2 can be written as:
PbCl2(s) ⇌ Pb2+(aq) + 2Cl-(aq)
Given the solubility of PbCl2 is 3.1 x 10-2 M, we can deduce the concentration of Pb2+ is 3.1 x 10-2 M and Cl- is 2 x 3.1 x 10-2 M. Thus, the Ksp can be calculated using the formula:
Ksp = [Pb2+][Cl-]2 = (3.1 x 10-2) x (2 x 3.1 x 10-2)2 = 5.88 x 10-5
2. Solubility of Al(OH)3 in Al(NO3)3 Solution
Given the Ksp of Al(OH)3 is 1.0 x 10-33, and the initial concentration of Al3+ from Al(NO3)3 is known, we need to account for the common ion effect which will reduce the solubility of Al(OH)3. This complex calculation would require additional steps to accurately account for the common ion.
3. Formation of PbCl2 Precipitate
NaCl dissociates to give Cl- ions and the Pb2+ from Pb(NO3)2 can form PbCl2, depending on the product of their concentrations relative to the Ksp of PbCl2. This assessment involves comparing the ionic product to the Ksp to determine if a precipitate will form.
Airplane cabins are pressurized so passengers can breathe comfortably at altitudes of up to 9,200 meters (30,000 feet).The air pressure inside the cabin at this altitude, however, is still lower than the atmospheric pressure at sea level. A passenger opens a resealable bag of raisins before the plane takes off from approximately sea level. He reseals the bag and leaves some air surrounding the raisins. What will the bag most likely look like when the plane is at its highest altitude?
Answer:
It will have expanded
Explanation:
Answer:
It will have expanded
Explanation:
Electrical energy is used to spin the blades of a ceiling fan. If the electricity is cut off, the fan blades will slow down and eventually stop spinning. Why?
A.
All the kinetic energy of the fan blades has been transformed into potential energy.
B.
All the potential energy of the fan blades has been transformed into kinetic energy.
C.
All the kinetic energy of the fan blades has been transformed into heat energy.
D.
All the potential energy of the fan blades has been transformed into heat energy.
Answer:
c
Explanation:
all of the friction from the fan blades and the fan inside has stopped the fan from spinning and friction is heat.
If the electricity is cut off, the fan blades will slow down and further eventually stop spinning in case of all the kinetic energy of the fan blades has been turned into heat energy. The correct option is C.
What is kinetic energy?In physics, an object's kinetic energy is the energy it has basically as a consequence of its motion.
It is described to as the amount of work required to accelerate a body of a given mass from initial state to a given velocity.
The body usually regains its kinetic energy after gaining it during acceleration unless its speed changes.
Kinetic energy is the energy that an object has as a consequence of its movement. The ability of kinetic energy to do work is perhaps its most crucial mandatory property.
Work is renowned as force acting in the direction of motion on an object. Work as well as energy are so inextricably interlinked that they can be utilized even interchangeably.
Thus, the correct option is A.
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Which of the following chemical reactions will produce a precipitate?
Answer:
CACO3 is a precipitate. answer C definitely.
The chemical reaction that will produce a precipitate is:
C. [tex]Na_2CO_3+CaCl_2----- > CaCO_3+2NaCl[/tex]
How precipitates are formed?Formation of an insoluble compound will sometimes occur when a solution containing a particular cation (a positively charged ion) is mixed with another solution containing a particular anion (a negatively charged ion). The solid that separates is called a precipitate.
Thus, out of the given options the option c will form a precipitate when sodium carbonate reacts with calcium chloride, calcium carbonate will form with a salt sodium chloride.
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How many grams are there in 5.00 moles of lead Pb?
A chemist makes 360mL of calcium sulfate working solution by adding distilled water to 90.0mL of a 10.7mmol/L stock solution of calcium sulfate in water. Calculate the concentration of the chemist's working solution. Round your answer to 3 significant digits.
Answer: The concentration of the chemist's working solution is 0.00268 M
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.
According to the neutralization law,
[tex]M_1V_1=M_2V_2[/tex]
where,
[tex]M_1[/tex] = molarity of stock solution = 10.7 mmol/L = 0.0107 mol/L [tex]1mmol=10^{-3}mol[/tex]
[tex]V_1[/tex] = volume of stock solution = 90.0 ml
[tex]M_2[/tex] = molarity of working solution = ?
[tex]V_2[/tex] = volume of working solution = 360 ml
[tex]0.0107\times 90.0=M_2\times 360[/tex]
[tex]M_2=0.00268M[/tex]
Thus the concentration of the chemist's working solution is 0.00268 M
Question about thermodynamics
Answer:
Thermodynamics is the branch of physics that deals with the relationships between heat and other forms of energy.
If velocity is positive, which would most likely yield a negative acceleration?
Afinal velocity that is faster than an initial velocity.
A time that is less than a half hour.
An initial velocity that is faster than a final velocity.
A time that is greater than a half hour.
Answer:
an initial velocity that is faster than the final velocity
Explanation:
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Answer:
C
Explanation:
Select the word(s) to complete the word equation that matches the description of the reaction.
Electrolysis breaks down water to form hydrogen and oxygen gas.
A. The word equation that represents this reaction is: water A bright light is produced when magnesium reacts with the oxygen in air to form magnesium oxide.
B. The word equation that represents this reaction is: magnesium oxygen When methane burns, it reacts with oxygen to produce water and carbon dioxide.
C. The word equation that represents this reaction is: methane oxygen
The word equation can be represented as the constituents of the equation are written in their full name rather than a symbol.
The word equations for the following descriptions are:
Electrolysis breaks down water to form hydrogen and oxygen gas:Water = Hydrogen + Oxygen
A bright light is produced when magnesium reacts with the oxygen in the air to form magnesium oxide.Magnesium + Oxygen = Magnesium Oxide
When methane burns, it reacts with oxygen to produce water and carbon dioxide.Methane + Oxygen = Carbon dioxide + water
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To complete the given word equations:
A. Water -> hydrogen + oxygen;
B. Magnesium + oxygen -> magnesium oxide;
C. Methane + oxygen -> carbon dioxide + water.
To complete the word equations for the described reactions, we need to identify the reactants and products in each case:
A. Electrolysis: The word equation that represents the breakdown of water into hydrogen and oxygen gas is:
water -> hydrogen + oxygenB. Magnesium Oxidation: The word equation describing the reaction of magnesium with oxygen to form magnesium oxide is:
magnesium + oxygen -> magnesium oxideC. Methane Combustion: The word equation for the burning of methane in oxygen to produce water and carbon dioxide is:
methane + oxygen -> carbon dioxide + waterWrite the word(s) to complete the word equation that matches the description of the reaction.
A. Electrolysis breaks down water to form hydrogen and oxygen gas. The word equation that represents this reaction is:
water -->
B. A bright light is produced when magnesium reacts with the oxygen in air to form magnesium oxide. The word equation that represents this reaction is:
magnesium + oxygen -->
C. When methane burns, it reacts with oxygen to produce water and carbon dioxide. The word equation that represents this reaction is:
methane + oxygen -->
Reactions leading to nucleic acid and protein synthesis are inherently different from those of intermediary metabolism. Such reactions must be essentially ________. The synthesis of polynucleotides is thus coupled to ________ _________ hydrolysis.
Answer:
irreversible, exergonic, pyrophosphate
Explanation:
Reactions leading to nucleic acid and protein synthesis are inherently different from those of intermediary metabolism. Such reactions must be essentially irreversible. The synthesis of polynucleotides is thus coupled to exergonic pyrophosphate hydrolysis.
If a plastic container of food at 1.0°C and 750. mm Hg is heated in a microwave to 80. °C, what is the new pressure inside the container? mmHg are the units of the answer and you can just enter the number value for the pressure.
Answer:
966.12 mmHg
Explanation:
-We apply Gay-Lussac's Law which holds that the pressure of a given gas is directly proportional to it's temperature(in Kelvins) for a constant volume:
[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]
Given that:
[tex]0\textdegree C=273.15K\\\\T_1=1.0\textdegree C=274.15K\\P_1=750.0\ mmHg\\\\T_2=80\textdegree C=353.15K\\\\P_2=?[/tex]
#We therefore substitute in the formula above to solve for the final pressure, P2:
[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}\\\\P_2=T_2\times\frac{P_1}{T_1}\\\\=353.15K\times\frac{750\ mmHg}{274.15K}\\\\=966.12\ mmHg[/tex]
Hence, is the new pressure inside the containe is 966.12 mmHg
Applying the concept of Gay-Lussac's law from physics, the pressure inside the plastic container of food, when heated from 1.0°C to 80°C, would increase to 966.67 mmHg.
Explanation:To answer this question, we need to use the concept of Gay-Lussac's Law from physics, which states that the pressure of a gas is directly proportional to its temperature, keeping volume constant. This means when you heat a gas, its pressure will increase.
However, it's important to note that the temperatures must be in Kelvin, not degrees Celsius. So, firstly we convert our temperatures from Celsius to Kelvin. 1°C = 274.15K and 80°C = 353.15K.
Using the formula P1/T1 = P2/T2 (P stands for pressure and T for temperature, the 1's indicating initial conditions and the 2's final), we plug in the values:
750mmHg/274.15K = P2/353.15K. Solving the equation we find P2 = 966.67 mmHg.
So, by heating the plastic container of food from 1.0°C to 80.0°C, the pressure inside the container would increase to 966.67 mmHg.
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A 0.7500 L solution has been boiled down to a new volume of 0.4510 L with a concentration of 2.033 M. What was the initial concentration of the solution?
Answer:5.3mol
Explanation:
Consider the following three solutions:(i) 0.10 M solution of a weak monoprotic acid(ii) 0.10 M solution of strong monoprotic acid(iii) 0.10 M solution of a weak diprotic acidEach solution is titrated with 0.15 M NaOH.Which of the following will be the same for all three solutions?A. the volume required to reach the final equivalence point B. the volume required to reach the first equivalence point C. the pH at the first equivalence point D. the pH at one-half the first equivalence point
Answer:
Option B
Explanation:
We have the tree solutions here:
A: weak monoprotic acid HA
B: Strong monoprotic acid HA'
C: weak diprotic acid H₂A
In order to explain this, let's discart the options one by one.
C and D cannot be the correct choice. This is because the pH is an expression that is determined by the following expression:
pH = -log[H₃O⁺]
In order to be the same value for all the solutions, the concentration of hydronium should be the same for all. This will be correct if all solutions were monoprotic and strong. However this is not the case.
Solution A and C are weak acids, so this means that they have dissociation constant Ka (In the case of C, it has two Ka values because it's diprotic). So, when these solutions reach the equivalence point or half the equivalence point, the concentration of the acid do not dissociate completely in solution, instead it do this:
HA + H₂O -------> A⁻ + H₃O⁺ Ka
0.1 0 0
0.1-x x x
[H₃O⁺] = x
Same thing happen with C, but we can see that the concentration is not the same as the innitial concentration.
Solution B is a strong acid, so it will dissociate completely in solution, so concentration of hydronium will be the same of the initial acid, and therefore the pH cannot be the same in the three solutions.
Option A cannot be either because, we have a diprotic solution, this means this acid requires two equivalence points to reach it's final, so, it takes more time and volume to reach the end point. Therefore, it's not the correct option.
Option B is the correct one, because regardless that we have a weak or a strong acid, or if it's diprotic or triprotic, the three of them have the same concentration of acid, and to reach the first equivalence point (the only point for A and B) will be the same for solution C. Therefore, this is the only thing the three solutions have in common.
Deoxyribonucleotides are so named because they lack a hydroxyl at which position?
Answer:
deoxyribonucleotides are so named because the lack a hydroxyl at the carbon position 2
1.Which has a larger radius Ca atom or Ca+2 ion?
2.Which has a greater radius F atom or F- ion?
3.Which is the correct way of understanding the trend for Ionic radius Vs. Atomic radius?
Answer:
1.Ca atom has greater radius than Ca+2
2.F- ion has larger radius than F
1. The Ca+2 ion has a smaller radius than the Ca atom. 2. The F- ion has a larger radius than the F atom. 3. The trend for ionic radius vs. atomic radius is that ions are generally smaller than their corresponding atoms.
Explanation:1. The Ca+2 ion has a smaller radius than the Ca atom. When an atom loses electrons to become a cation, it loses its outermost electrons, resulting in a decrease in the size of its electron cloud and thus a smaller radius.
2. The F- ion has a larger radius than the F atom. When an atom gains electrons to become an anion, it adds electrons to its outermost energy level, resulting in an increase in the size of its electron cloud and thus a larger radius.
3. The trend for ionic radius vs. atomic radius is that ions are generally smaller than their corresponding atoms. Cations are smaller than their parent atoms because they have lost electrons, which reduces the electron cloud and decreases the size. Anions are larger than their parent atoms because they have gained electrons, which increases the electron cloud and increases the size.