Which configuration of a phospholipid would you expect to see in the presence of water?
Why is it important to stir the solution in the flask as you add titrant from the buret?
Matt made a list of materials that conduct heat and electricity he noted that most materials that conduct heat also conduct electricity Matt concluded that only metals conduct both heat and electricity how would you respond to matt's conclusion
Matt's conclusion that only metals conduct both heat and electricity is partially correct. While most metals do conduct both, there are also non-metal substances, like graphite and ionic solutions, that exhibit these properties.
Explanation:While Matt's observation that many materials that conduct heat also conduct electricity is correct, his conclusion that only metals conduct both heat and electricity is not completely accurate. In fact, there are also some non-metal materials which can conduct heat and electricity. For example, graphite, a form of carbon and a non-metal, has layers of carbon atoms that are free to move and conduct electricity. Similarly, many ionic solutions can also conduct electricity when they are in the liquid state as their ions are free to move.
Conduction of heat and electricity often happens in materials that have free electrons. Metals are a great example of this, but they're not the only example. So, while it's true that most metals do conduct both heat and electricity, it's important to note that they are not the only materials that can do so.
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The electron stable state configuration in atoms is best seen in the ______ configuration.
inert gas
full d shell
full f shell
full s shell
Aluminium chloride dissolved in Water =? When you dissolve aluminium chloride in water, what is the balanced chemical equation? NOTE: Not a chemical reaction, just dissolving.
Convert 112°C to Kelvin.
Answer:
112 °C = 385 K
Explanation:
The relation between Kelvin and Celsius degrees is
0°C = 273.15 K
To convert the temperature from Celsius to Kelvin we must add 273.15:
112 °C + 273.15 = 385.15 K
With the correct significant figures the answer would be 385 K
What is the ph of a solution containing 0.12 mol/l of nh4cl and 0.03 mol/l of naoh (pka of is 9.25)?
The Henderson-Hasselbalch equation fails to provide accurate pH readings for excessively diluted buffer solutions because it ignores the self-dissociation that occurs in water. The pH of the solution is 8.65.
The Henderson-Hasselbalch equation establishes a connection between an acid's pKa (acid dissociation constant) and pH in aqueous solutions. When the concentration of the acid and its conjugate base, or the base and the corresponding conjugate acid, are known, the pH of a buffer solution can be determined with the use of this equation.
The expression used to calculate pOH is:
pOH = pKb + log [Conjugate acid]/ [Weak base]
pKa + pKb = 14
pKb = 14 - pKa
pKb = 14 - 9.25
pKb = 4.75
pOH = 4.75 + log 0.12 / 0.03
pOH = 5.35
pH = 14 - pOH
pH = 14 - 5.35
pH = 8.65
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A covalent bond between two atoms occurs when the atoms
Covalent bonds between atoms form when these atoms share one or more pairs of their valence electrons. This is a pathway to stability for the atoms involved. This type of bonding happens in many compounds, such as in a molecule of hydrogen.
Explanation:A covalent bond between two atoms occurs when these atoms share one or more pairs of their valence electrons. In this type of bonding, both atoms contribute at least one electron to the shared pair. This is a way for both atoms to achieve a stable electron configuration, often completing an outer shell of electrons.
For example, consider the hydrogen molecule, H2. Hydrogen has one valence electron and needs two for stability, so two hydrogen atoms can share their electrons to form a covalent bond, resulting in a stable molecule.
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A 0.465 g sample of an unknown compound occupies 245 mL at 298 K and 1.22 atm. What is the molar mass of the unknown compound?
How many milliliters of a 0.266 m lino3 solution are required to make 150.0 ml of 0.075 m lino3 solution?
We need an equation that would relate the concentration of the original solution to that of the desired solution. To solve this we use the equation expressed as follows,
M1V1 = M2V2
where M1 is the concentration of the stock solution, V1 is the volume of the stock solution, M2 is the concentration of the new solution and V2 is its volume.
M1V1 = M2V2
0.266 M x V1 = 0.075 M x 150 mL
V1 = 42.29 mL
Therefore, we need about 42.29 mL of the 0.266 M of lithium nitrate solution to make 150.0 mL of the 0.075 M lithium nitrate solution.
[tex]\boxed{{\text{42}}{\text{.3 mL}}}[/tex] of a 0.266 M [tex]{\text{LiN}}{{\text{O}}_{\text{3}}}[/tex] solution is required to make 150 mL of a 0.075 M [tex]{\text{LiN}}{{\text{O}}_{\text{3}}}[/tex] solution.
Further Explanation:
The concentration is the proportion of substance in the mixture. The most commonly used concentration terms are as follows:
1. Molarity (M)
2. Molality (m)
3. Mole fraction (X)
4. Parts per million (ppm)
5. Mass percent ((w/w) %)
6. Volume percent ((v/v) %)
Molarity is a concentration term that is defined as the number of moles of solute dissolved in one litre of the solution. It is denoted by M and its unit is mol/L.
The molarity equation is given by the following expression:
[tex]{{\text{M}}_{\text{1}}}{{\text{V}}_{\text{1}}} = {{\text{M}}_{\text{2}}}{{\text{V}}_{\text{2}}}[/tex] …… (1)
Here,
[tex]{{\text{M}}_{\text{1}}}[/tex] is the molarity of the initial [tex]{\text{LiN}}{{\text{O}}_{\text{3}}}[/tex] solution.
[tex]{{\text{V}}_{_{\text{1}}}}[/tex] is the volume of the initial [tex]{\text{LiN}}{{\text{O}}_{\text{3}}}[/tex] solution.
[tex]{{\text{M}}_{\text{2}}}[/tex] is the molarity of the new [tex]{\text{LiN}}{{\text{O}}_{\text{3}}}[/tex] solution.
[tex]{{\text{V}}_{_{\text{2}}}}[/tex] is the volume of the new [tex]{\text{LiN}}{{\text{O}}_{\text{3}}}[/tex] solution.
Rearrange equation (1) to calculate [tex]{{\text{V}}_{\text{1}}}[/tex].
[tex]{{\text{V}}_{\text{1}}}=\frac{{{{\text{M}}_{\text{2}}}{{\text{V}}_{\text{2}}}}}{{{{\text{M}}_{\text{1}}}}}[/tex] …… (2)
The value of [tex]{{\text{M}}_{\text{1}}}[/tex] is 0.266 M.
The value of [tex]{{\text{M}}_{\text{2}}}[/tex] is 0.075 M.
The value of [tex]{{\text{V}}_{_{\text{2}}}}[/tex] is 150 mL.
Substitute these values in equation (2).
[tex]\begin{aligned}{{\text{V}}_{\text{1}}}&=\frac{{\left({{\text{0}}{\text{.075 M}}} \right)\left( {{\text{150 mL}}} \right)}}{{{\text{0}}{\text{.266 M}}}}\\&=42.29{\text{ mL}}\\&\approx 42.{\text{3 mL}}\\\end{aligned}[/tex]
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Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Concentration terms
Keywords: molarity, LiNO3, 42.3 mL, molarity equation, volume, M1, M2, V1, V2, 150 mL, 0.075 M, 0.266 M, concentration, concentration terms.
Ammonia nh3 chemically reacts with oxygen gas o2 to produce nitric oxide no and water h2o . what mass of water is produced by the reaction of 8.45g of oxygen gas? round your answer to 3 significant digits.
In the reaction, each mole of O2 produces 1.2 moles of H2O. By converting the mass of O2 in the problem to moles (using O2's molar mass), multiply by 1.2 to find moles of H2O, and then converting moles of H2O to grams (using H2O's molar mass), the problem can be solved.
Explanation:This question concerns the reaction of ammonia (NH3) with oxygen gas (O2) to produce nitric oxide (NO) and water (H2O). This is an oxidation-reduction reaction. The balanced equation for the reaction is actually 4NH3 (g) + 5O2 (g) -> 4NO (g) + 6H2O (g). Oxygen's molar mass is 32.00 g/mol, the molar mass of water is 18.02 g/mol. Therefore, for every 5 mol of O2, 6 mol of H2O are produced, or every 1 mol of O2 produces 1.2 mol of H2O (6/5). So, you can calculate the number of moles of gas in 8.45 g then multiply by 1.2 to get the number of moles of H2O, and finally multiply this by the molar mass of H2O to find the mass in grams. The final answer can be rounded to 3 significant digits.
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Write a balanced equation for the oxidation-reduction reaction that occurs when hydrogen peroxide reacts with ferrous ion
The balanced equation for the reaction of hydrogen peroxide with ferrous ions to produce ferric ions and water in an acidic solution is H2O2(aq) + 2H+(aq) + 2Fe2+(aq) → 2H2O(l) + 2Fe3+(aq).
The balanced equation for the oxidation-reduction reaction that occurs when hydrogen peroxide reacts with the ferrous ion (Fe2+) in an acidic solution to produce ferric ion (Fe3+) and water is:
H2O2(aq) + 2H+(aq) + 2Fe2+(aq) → 2H2O(l) + 2Fe3+(aq)
This reaction showcases the oxidizing property of hydrogen peroxide. The ferrous ion (Fe2+) is oxidized to the ferric ion (Fe3+), while the hydrogen peroxide (H2O2) is reduced to water (H2O).
Copper is which type of solid? molecular solid ionic solid covalent atomic solid metallic atomic solid
Copper is a metallic atomic solid , the atoms are arranged in a regular pattern, with the valence electrons being free to move throughout the structure.Thus, the correct option is metallic atomic solid.
Copper is an example of a metal, and metals typically exhibit metallic bonding, where the valence electrons form a "sea" of delocalized electrons, creating strong bonds between the metal atoms. This allows for the high electrical and thermal conductivity that metals are known for.
Metallic solids are compounds that are entirely comprised of metal atoms that are held together by metallic bonds.Metallic bonding is a type of intramolecular force of attraction that occurs between a lattice of positive ions and a "sea" of delocalized electrons.
Thus, the correct option is metallic atomic solid.
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How many grams of naoh would react with 507 g fecl2 in the reaction fecl2 + 2naoh fe(oh)2(s) + 2nacl?
Answer:ANSWER
Explanation:
How much heat is removed from the skin by the evaporation of 190 g (about 1/2 cup) of isopropyl alcohol?
The evaporation of 190g of isopropyl alcohol would remove approximately 463.6 kJ of heat.
Explanation:The student asked: 'How much heat is removed from the skin by the evaporation of 190 g (about 1/2 cup) of isopropyl alcohol?' The process of evaporation removes heat from the surface it's occurring on because energy is needed to change a substance from a liquid state to a gaseous one. This is known as the enthalpy of vaporization. Unfortunately, the value provided for the vaporization of water can't be directly used for isopropyl alcohol. However, using related scientific data, the approximate heat of vaporization for isopropyl alcohol is about 2.44 kJ/g. Therefore, to calculate the heat removed by evaporation of 190g of isopropyl alcohol, we would multiply the mass (190g) by the heat of vaporization (2.44 kJ/g) which totals approximately 463.6 kJ.
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To calculate the heat removed by the evaporation of isopropyl alcohol, one would typically multiply the number of moles of the alcohol by its heat of vaporization, which is approximately 45.3 kJ/mol at boiling point; however, the specific heat of vaporization at skin temperature is necessary to determine the exact amount of heat removed.
Explanation:To determine how much heat is removed from the skin by the evaporation of isopropyl alcohol, we need the heat of vaporization for isopropyl alcohol (also known as isopropanol). The heat of vaporization is the amount of heat required to turn a liquid into a vapor without a temperature change. Unfortunately, we do not have the exact heat of vaporization value for isopropyl alcohol at human skin temperature provided in the reference, which would directly allow the calculation. However, we can consider that the heat of vaporization for isopropyl alcohol is typically around 45.3 kJ/mol at its boiling point.
For the sake of explanation, let's assume that this value is close enough to use for a skin temperature of 37 °C. The molar mass of isopropyl alcohol (C3H8O) is approximately 60.1 g/mol. First, we would convert 190 g of isopropyl alcohol to moles:
Moles of isopropyl alcohol = mass (g) / molar mass (g/mol) = 190 g / 60.1 g/mol
Then, we would multiply the moles by the heat of vaporization to get the total amount of heat removed:
Heat removed (kJ) = moles * heat of vaporization (kJ/mol)
Without the exact value for the heat of vaporization of isopropyl alcohol at skin temperature, we cannot provide the exact amount of heat removed. However, this process illustrates how the calculation would be performed given the correct data.
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Problem page write a balanced half-reaction for the reduction of solid manganese dioxide mno2 to manganese ion mn 2 in acidic aqueous solution. be sure to add physical state symbols where appropriate.
In a reduction reaction, some electrons are gained by the substance being reduced. The balanced half-reaction to this would be:
MnO2(s) + 4 H+ (aq) + 2e ---> Mn^2+ (aq) + 2 H2O (aq)
It is called balanced reaction since the number of each element in the left side is equal to the number of each element on the right side.
The balanced half-reaction for the reduction of solid manganese dioxide (MnO2) to manganese ion (Mn^2+) in acidic aqueous solution is: 2MnO2 (s) + 4H+ (aq) + 2e- -> Mn^2+ (aq) + 2H2O (l).
Explanation:The balanced half-reaction for the reduction of solid manganese dioxide (MnO2) to manganese ion (Mn^2+) in acidic aqueous solution is:
2MnO2 (s) + 4H+ (aq) + 2e- → Mn^2+ (aq) + 2H2O (l)
In this reaction, the solid manganese dioxide is reduced to manganese ion by gaining two electrons, and four hydrogen ions are involved in the reaction to balance the charges.
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Helium has a density of 1.79×10^-4 g/mL at standard temperature and pressure. A balloon has a volume of 6.3 liters. Calculate the mass of helium that it would take to fill the balloon. Be sure to follow significant figure rules when calculating the answer.
A. 35,000g
B. 1.1×10^-3 g
C. 2.8×10^-5 g
D. 1.1g
When the volume of a gas is changed from 3.6 L to 15.5 L, the temperature will change from oC to 87°C
Answer:
-189.5
Explanation:
Correct with Acellus Chemistry
Radioactive decay occurs when two nuclei are smashed into each other and combine to form a much larger nucleus and release a vast amount of energy.
True
False
Consider KOH and the following information. Hsol = –58 kJ/mol Hhydr of = –336 kJ/mol Hhydr of = –532.7 kJ/mol What is the Hlat rounded to the correct number of significant figures? Use Hsol = –Hlat + Hhydr.
A. –927 kJ/mol
B. –926.7 kJ/mol
C. –811 kJ/mol
D. –810.7 kJ/mol
The total Hhydr is:
Hhydr = – 336 kJ/mol + – 532.7 kJ/mol
Hhydr = - 868.7 kJ/mol
Therefore using the formula Hsol = –Hlat + Hhydr we can get Hlat.
– 58 kJ/mol = – Hlat + - 868.7 kJ/mol
- Hlat = 810.7 kJ/mol
Hlat = - 810.7 kJ/mol
ANSWER:
D. –810.7 kJ/molAnswer:D
Explanation:
A car travels at 15 kilometers west in 10 minutes after reaching the destination the car travels back to the starting point again taking 5 minutes what is the average velocity of the car
Answer: D 2.0 meters/second
Explanation:
If 1.20 moles of an ideal gas occupy a volume of 18.2 L at a pressure of 1.80 atm, what is the temperature of the gas, in degrees Celsius?
-125°C
59.5°C
273°C
32°C
A 1.50-g sample of hydrated copper(ii) sulfatewas heated carefully until it had changed completely to anhydrous copper(ii) sulfate () with a mass of 0.957 g. determine the value of x. [this number is called the number of waters of hydration of copper(ii) sulfate. it specifies the number of water molecules per formula unit of in the hydrated crystal.]
Research the amount of carbon dioxide generally found in the air and in breath. which has more carbon dioxide? what are some of the other sources of carbon dioxide in air?
Answer:
1- Carbon dioxide in our breath comes from the carbon in our food.
2- All plants need carbon dioxide to survive.
3- About .04 percent of the atmosphere's air is carbon dioxide and 4.4 percent of our breath is carbon dioxide we breathe out more carbon dioxide than we breathe in.
4- Some effects might include combustion with other gasses and it could also potentially kill all life.
Explanation:
What volume of 0.0200 m calcium hydroxide?
A(n) ________ chemical reaction releases energy, whereas a(n) ________ reaction requires an input of energy.
Answer:
Exothermic chemical reaction
Endothermic chemical reaction
An Exothermic chemical reaction releases energy, whereas an Endothermic chemical reaction requires an input of energy.
An Exothermic chemical reaction involves the release of heat(thermal energy) in a system to the surroundings. The enthalpy(heat) change which is ΔH decreases in this type of reaction
An Endothermic chemical reaction involves the absorption or input of heat in the form of thermal energy by the system from the surroundings. The enthalpy(heat) change which is ΔH increases in this type of reaction.
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Jane bought some raisins to keep in her purse as a snack what is one reason raisins dont need refrigeration
Answer: The drying process worked to preserve them
Explanation: apex
Which is expected to have the largest dispersion forces? which is expected to have the largest dispersion forces? c12h26 be cl2 c3h8 f2?
The one I would expect to have the largest dispersion forces would be the largest and heaviest molecule. This is evidenced by the fact that that molecule is a liquid at room temperature while all the others are gases.
C3H8 = This is propane and a gas at room temperature
F2 = Also a gas at room temperature
BeCl2 = This is a solid and forms an extended lattice in the form of Be-Cl-Be bridges therefore dispersion forces are not important
Therefore the answer to this is C12H26 which is a wax and a liquid at room temperature.
Answer:
C12H26
Among the substances listed (C12H26, Be, Cl2, C3H8, F2), the largest dispersion forces are expected in C12H26 due to its larger molecular size and weight. Dispersion forces are temporary shifts in electron density causing attraction between molecules and are much stronger in larger and heavier molecules. Smaller molecules like Cl₂ and F₂ have weaker dispersion forces.
Explanation:The substance expected to have the largest dispersion forces from the ones mentioned (C12H26, Be, Cl2, C3H8, F2) is C12H26 due to its large size and molecular weight. Dispersion forces, also known as London dispersion forces, are temporary shifts in electron density in non-polar molecules that result in attraction between molecules. This is typically stronger in larger and heavier molecules. As C12H26 is a larger, heavier, and more complex molecule than the others listed, it has more electrons, hence more shifting of electron density and stronger resultant dispersion forces.
For other compounds like Cl₂ and F₂, they are gases at room temperature, meaning that their dispersion forces are weaker. This is because dispersion forces influence the boiling and melting points of substances. Larger dispersion forces lead to higher melting and boiling points, which is also why C12H26, a component of diesel and other heavy oils, is a liquid at room temperature.
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Aluminum reacts with chlorine gas to form aluminum chloride. 2al(s)+3cl2(g)→2alcl3(s) what minimum volume of chlorine gas (at 298 k and 225 mmhg) is required to completely react with 7.85 g of aluminum
To find the minimum volume of chlorine gas required to react with 7.85 g of aluminum, we convert the mass of aluminum to moles, find the necessary moles of chlorine gas using the balanced equation, and then apply the ideal gas law to find the volume.
Explanation:The question is asking about the volume of chlorine gas required to completely react with a given amount of aluminum. We know from the balanced equation that 2 moles of aluminum (Al) react with 3 moles of chlorine gas (Cl) to form 2 moles of aluminum chloride (AlCl₃). First, we've to convert the mass of aluminum to moles by dividing the mass 7.85g by the molar mass of aluminum (26.98 g/mol), giving approximately 0.291 mol.
From the equation, we know the mole ratio of Al to Cl2 is 2 to 3. Therefore, 0.291 moles of Al will require 0.437 mol of Cl₂. Next, we apply the ideal gas law (PV=nRT) to find the volume. Here, P=225 mmHg (which is 0.296 atmospheres), R=0.0821(atm L)/(mol K), T=298 K and n=0.437 mol.
Finally, solving for V in PV=nRT gives us V = nRT/P, approximating 11.08 L as the minimum volume of chlorine gas required to react.
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when the pressure that a gas exerts on a sealed container changes from blank torr to 900 torr the temperature changes from 300 k to 450 k
Answer:
Initial pressure = 600 torr
Explanation:
Given:
Initial pressure, P1 = 900 torr
Initial Temperature, T1 = 300 K
Final temperature, T2 = 450 K
To determine:
Final pressure of gas, P2
Explanation:
Based on the ideal gas equation
[tex]PV = nRT\\[/tex]
where n = moles of gas
R = gas constant, T = temperature
At constant volume (V), the above equation becomes:
P/T = constant
This is Gay-Lussac's law
[tex]\frac{P1}{T1} =\frac{P2}{T2} \\\\P1=\frac{P2}{T2} *T1=\frac{900\ torr}{450\ K} *300\ K=600\ torr[/tex]