Molality and molarity are same = 5.23M
(a)Molarity = moles of solute / volume of solution (in L)
Molarity = mass of solute / molecular weight of solute × volume of solution (in L)
Molarity = 11.0 / 20.01 × 0.105
5.23M = Molarity
(b) Molality = moles of solute / volume of solution (in kg)
Molality = mass of solute / molecular weight of solute × volume of solution (in kg)
Molality = 11.0 / 20.01 × 0.105
5.23M = Molality
Hence, both molality and molarity are same = 5.23M
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A student looks at an animated model of the plants orbiting the sun. What should the model show to demonstrate why plants do not end up going into the sun? (1 point)
A. The planets are far away so they cannot go into the sun.
B. The planets move too fast to go into the sun.
C. The planets are made of rock and gas and cannot go into the sun.
D. The planets are too big to go into the sun.
The model shown should demonstrate why planets do not end up going into the sun as follows: The planets move too fast to go into the sun. (option A).
What are planets?Planets are the bodies that orbit round the sun. The planets are seven in number as follows:
EarthMarsMercuryJupiterSaturnVenusPlutoAccording to this question, a student looks at an animated model of the planets orbiting the sun. In reality, this planets do not go into the sun because they are far away from the sun.
The Earth as a planet for example is not moving fast enough to escape the sun's gravity and leave the solar system, but it is going too fast to be pulled into the sun. Therefore, it keeps going around and around in an orbital manner.
Therefore, the model shown should demonstrate why planets do not end up going into the sun as follows: The planets move too fast to go into the sun.
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A book is pushed off the edge of a table. At what point during the fall will the potential and kinetic energy be equal? A. 1/4 of the way down B. 1/2 of the way down C. 3/4 of the way down D. right before it hits the ground
The point during the fall will the potential and kinetic energy be equal is B. 1/2 of the way down.
How to illustrate the information?It should be noted that the point when the potential and kinetic energy be equal will be at the midpoint of the initial height.
Therefore, the object possesses potential energy when at rest and then kinetic energy when in motion.
When KE = PE
We can deduce that KE+PE = MGH and PE+ PE = MGH
This implies that MGH + MGH= 2MGH and 2H = H
Therefore, the point during the fall will the potential and kinetic energy be equal is B. 1/2 of the way down.
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What is the force required to accelerate a 10 KG object at 1 M/S/S
PLEASE I REALLY NEED THIS RN PLEASE
The force required to accelerate a 10 kg object at 1 M/S/S is 10 N.
What is force?Force is defined as an action that has the capability of changing the motion of an object.It has both magnitude as well as direction owing to which it can be described as a vector quantity.
It's SI unit is Newton and is represented by symbol F.It can be measured by instruments named force gauge,spring scale and load cell.It is an external agent which can change the body's state of motion or rest.
There are two types of forces
1) contact force
2)non-contact force
Force is calculated by the formula,
F=m×a
where m=mass and a=acceleration
In the given problem ,m=10 kg and a=1 ms[tex]^-2[/tex]
substituting the values in the formula,
F=10×1=10 N.
Thus, the force acting on object of 10 kg is 10 N when acceleration is 1 ms[tex]^-2[/tex].
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Sample of sodium reacts completely with 497 g of chlorine, forming 819 g of sodium chloride. what mass of sodium reacted?
360.87g of sodium reacted with 497g of chlorine to form 819g of sodium chloride (NaCl).
Chlorine and sodium react to form sodium chloride (NaCl). Below is the balanced reaction:
Cl2 + 2Na = 2NaCl.
1 mole of Na interacts with 1 mole of Cl2 to create 2 moles of NaCl. Sodium's atomic mass is 23 and chlorine's molar mass is 71, while sodium chloride's molar mass is 58.5.
As a result, the reaction between 46g Na and 71g Cl2 yields (2 X 58.5)g = 117g of NaCl. Na fully interacts in response to the question, indicating Na as the limiting reactant. Thus, the amount of Na that reacts is equal to the amount of NaCl that is created.
Produced NaCl = 819g = (819/58.5) moles = 15.69 moles. The amount of Na that reacted was 15.69 moles = 15.69 X 23g = 360.87g.
Result:
Amount of Na reacted is 360.87g.
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1. Which of the following is NOT made of cells?
a. bacteria
b. leaf
C. sand
d. snail
Answer:
Sand is not made of cells
Answer:
C. sand
Explanation:
Bacteria is living so it is made of cells. A leaf is living so it is also made of cells. A snail is also a living thing, so it is made of cells. The only thing there that is not living is sand. So sand is not made of cells.
Hope this helps! :)
What are the five types of colloids? Describe each
What is generally true about the compressibility of solids
solids are not compressible, this is why it has a fixed shape
Please help
1. What do you know already about the reactions of metals with water, acids and with the air (oxygen)?
2.Is it unusual for a metal to react with cold water (H20) ?
3.Is it usual for a metal to react with dilute hydrochloric acid? If it is, what are the products of the reaction (think coursework ...
magnesium and hydrochloric acid)
4. Is it usual for a metal to react with air / oxygen? If it is, what type of product forms?
Answer:
1: A salt plus hydrogen gas
2: Yes, the metals which react with cold water are; sodium, calcium and potassium. Magnesium does not react with cold water. Metals like aluminum, iron and zinc do not react either with cold or hot water. Metals such as lead, copper, silver and gold do not react with water at all.
3: There is no reaction between dilute hydrochloric acid or sulfuric acid and the metals below hydrogen in the reactivity series.
4: Yes. The product that forms is called rust.
3.35 kg N2O5
Express your answer using three significant figures.
Please help me! explain the steps for better understanding.
Answer:
31.0
Explanation:
Lets convert to grams
3.35 x 1000 = 3350 grams of N2O5
3350 / molar mass of N2O5 (108 grams) = 31.0 moles
What are some examples of geoscience processes that can change features of the earth's surface?
Surface processes such as erosion, movement, weathering, and the deposition of sediment can modify surface features, such as mountains, or create new features, such as canyons.
Have a great day!
The surface of the Earth is constantly changing as a result of geoscience processes such as weathering, erosion, and deposition. Systems on the planet interact to influence Earth's past, present, and future.
Geoscience investigates the processes that shape the Earth's surface, the resources humans utilize, and how water and ecosystems are related. It covers much more than just rocks and volcanoes. Chemistry, physics, biology, and arithmetic, as well as other scientific disciplines, are used in geoscience.
The surface of the Earth is constantly changing as a result of geoscience processes such as weathering, erosion, and deposition. Systems on the planet interact to influence Earth's past, present, and future.
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What is the ph at the equivalence point in the titration of 100 ml of 0.10 m hcn with 0.10 m naoh?
The ph at the equivalence point in the titration of 100 ml of 0.10 m HCN with 0.10 m NaOH is 11.04.
To ascertain the concentration of an identified analyte, titration is a typical laboratory technique for quantitative chemical analysis. A standard solution with a known concentration and volume is prepared as the reagent, also known as the titrant or titrator.
The food business uses titration extensively as an analytical method. It enables food producers to estimate the concentration of a reactant in a sample. For instance, it can be used to determine a food's salt or sugar content or the amount of vitamin C or E, which affects the color of the product.
[tex]HCN + OH^{-}[/tex] →[tex]H_{2}O + CN^{-}[/tex]
At the equivalence point, 10 mmol of cyanide ions are held in 200 mL of solution.
[[tex]CN^{-}[/tex]] = 10 mmol/200 mL = 0,05 M
Kb = [tex]\frac{ 1.0E^{-14} }{4.9E^{-10} }[/tex]
Kb = 2.0E-5 corresponding to [tex]CN^{-}[/tex] + [tex]H_{2}O[/tex]= HCN + [tex]OH^{-}[/tex]
Kb =[tex]\frac{[HCN][OH^{-}}{CN^{-}}[/tex]
y=0.0011 M =[[tex]OH^{-}[/tex]]
pOH = 2.96
pH = 14.00 - pOH = 11.04
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Current of 4.59 a is passed through a fe(no3)2 solution for 1.80 h . how much iron is plated out of the solution?
8.6057 g iron is plated out of the solution.
The process of depositing a layer of one metal over the surface of another metal by passing electric current is called electroplating. Electroplating of metals is done to protect them from corrosion and for decoration purpose. For example, the vessels of iron are electroplated with copper or silver or gold to make it attractive and to protect from rusting.
Given,
Current = 4.59 A
Time = 1.80hr
Given solution is Fe(NO3)2
Now,
we have to find out the iron which is plated out of the solution
So,
(4.59 C/sec) (6480 sec) = 29,734.2
29,734.2 C / 96485 C/mol =0.3082 mole of electrons passed
Fe2+ + 2e- ---> Fe
0.3082 mol e- / 2 mol e- per mole Fe = 0.1541 mol Fe
(0.1541 mol) (55.845 g/mol) = 8.6057 g.
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Which is a characteristic of the electron sea model for metallic bonding? molecular orbitals overlap to produce bands. electrons flow easily between metal nuclei. electrons are in fixed positions in the orbitals. atomic nuclei are arranged in an irregular pattern.
Atomic nuclei are arranged in a regular pattern is a characteristic of the electron sea model for metallic bonding.
The electron sea model is a popular model for metallic bonding. In this model, atoms are arranged in a regular pattern and each atom has a "sea" of electrons around it. This sea of electrons is responsible for the metallic bond.
The main advantage of the electron sea model is that it can explain the properties of metals very well. For example, why metals are good conductors of electricity and heat.
One of the drawbacks of the electron sea model is that it doesn't explain why some metals are magnetic. This is because the model assumes that all of the electrons are in the same orbital and spin in the same direction. However, we know that some electrons do spin in the opposite direction, which creates a magnetic field.
Overall, the electron sea model is a good way to understand the basics of metallic bonding. However, it doesn't explain everything and there are some limitations to the model.
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Answer:
Electrons flow easily between metal nuclei
Explanation:
What is the mass (in grams) of a material that has a density of 2.69 g/mL and a volume of 13.4 mL?
The mass (in grams) of the material that has a density of 2.69 g/mL and a volume of 13.4 mL is 36.046 g
What is density?The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as
Density = mass / volume
With the above formula, we can determine the mass of the material. Details below
How to determine the mass of the materialThe mass of the material can be obtained as illustrated below:
Density of material = 2.69 g/mLVolume of material = 13.4 mLMass of material =?Density = mass / volume
Cross multiply
Mass = Density × Volume
Mass of material = 2.69 × 13.4
Mass of material = 36.046 g
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Sugar is easily soluble in water and has a molar mass of 342.30 g/mol. what is the molar concentration of a 265.7 ml aqueous solution prepared with 74.2 g of sugar?
The molar concentration of the sugar solution is 0.815M
The best approach to describe a solute concentration in a solution is by molar concentration. According to the formula M = mol/L, molarity is defined as the total number of moles of solute dissolved in one litre of solution.
Given:
Mass, m = 74.2g
Molar mass, mm = 342.30g/mol
Volume, v = 265.7ml
To find:
Molar concentration, M = ?
Formula:
Molar concentration, M = mole / dm^3 of solution
Calculations:
No. of moles = Mass, m / molar mass, mm
No. of moles = 74.2 / 342.3
No. of moles = 0.216 mol
Molar concentration, M = 0.216 / 0.265
Molar concentration = 0.815M
Result:
The molar concentration of the sugar solution is found to be 0.815M
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isn't the activity in Bq
What is the name of this model of the atom
Answer:
Tetravalent atom or tetra-atom
2
A balloon with a volume of 250.0 ml at sea level has a pressure of 760.0 mm of Hg.
The balloon is released and it climbs to a level with a new pressure of 600.0 mm of Hg.
What is the new volume of the balloon? [Difficulty 1]
The final volume of the balloon will be 316.6 ml
Given,
V1= 250 ml
P1= 760 mm Hg
V2=?
P2= 600 mm Hg
From the given question, the final volume can be calculated using Boyle's law.
The link between a gas's pressure, volume, and temperature is shown by Boyle's law. It asserts that under constant temperature, a gas's pressure is inversely proportional to its volume.
Boyle's law is valid only for ideal gas.
Pressure and volume are represented by a rectangular hyperbola on the graph.
P ∝ 1/V or PV = K
∴P1 x V1 = P2 x V2
⇒ 250 x 760 = 600 x V2
⇒190000 = 600 x V2
⇒190000/ 600 = V2
⇒V2 = 316.6 ml
Hence, the new volume of the balloon will be 316.6 ml.
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A red glaze on porcelain can be produced by using mnso4. what is the name of the compound?
The name of the compound is manganese (II) sulfate.
In most cases, the inorganic compound with the formula [tex]MnSO_{4} . H_{2} O[/tex] is referred to as manganese(II) sulfate. A manganese(II) salt with great commercial value is this light pink deliquescent solid. For purposes that are compatible with sulfates, manganese sulfate is a relatively water- and acid-soluble manganese source.
When a metal is substituted for one or both of the hydrogen atoms in sulfuric acid, salts or esters known as sulfate compounds are created.
Blacks, browns, and purples are produced through the use of manganese as a coloring agent in bodies and glazes. Most glaze melts can easily dissolve smaller amounts of manganese; however, at concentrations above 5%, the manganese will precipitate and crystallize. Metallic surfaces are likely when a glaze contains a lot of metal (like 20%).
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What volume in ml of 0.05 m h2so4 can be prepared from 2.5 g h2so4 and sufficient water?
12.5 volume in ml of 0.05 m Sulphuric can be prepared from 2.5 g sulphuric acid and sufficient water.
What is Volume?
Volume is a measurement of three-dimensional space that is occupied. It is frequently expressed numerically using imperial or SI-derived units. Volume and the notion of length are connected.
As a result, we can observe that 0.5 moles of sulphuric acid are required to neutralise 1 mole of NaOH. Now let's figure out how much NaOH is specified.
NaOH is assumed to weigh 2.5 g.
NaOH has a molar mass of 40 g.
=> 62.5 millimoles of NaOH are equal to 2.540 moles.
The required amount of sulfuric acid is 62.5/2 millimoles, or 31.25 millimoles.
We now understand that millimoles equal molarity times volume (in ml)
replacing the specified values,
31.25 = 2.5 * V
=> V = 12.5 ml
As a result, 12.5 cc of sulfuric acid is needed.
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When water dissolves a substance, weak charges on water molecules attract oppositely charged portions of the substance, pulling them out into solution. Which property of water accounts for this occurrence?.
Which equation is balanced? mg3n2 h2o 3mgo 2nh3 c3h8 5o2 h2o 3co2 zn 2hcl zncl2 h2 3h2so4 2fe fe2(so4)3 h2
The balanced chemical equation is [tex]Zn + 2HCl[/tex] → [tex]ZnCl_{2} + H_{2}[/tex] .
The given chemical equation [tex]Mg_{3} N_{2} + H_{2}O[/tex] → [tex]3MgO + 2NH_{3}[/tex] is not a balanced chemical equation because number of hydrogens and oxygens are not same on both sides. Balanced chemical equation for this reaction will be [tex]Mg_{3} N_{2} + 3H_{2} O[/tex] → [tex]3MgO + 2NH_{3}[/tex]..
The given chemical equation [tex]C_{3} H_{8} + 5O_{2}[/tex] → [tex]H_{2} O + 3CO_{2}[/tex] is not a balanced chemical equation because number of hydrogens and oxygens are not same on both sides. Balanced chemical equation for this reaction will be[tex]C_{3} H_{8} + 5O_{2}[/tex] → [tex]4H_{2} O + 3CO_{2}[/tex].
The given chemical equation [tex]Zn + 2HCl[/tex] → [tex]ZnCl_{2} + H_{2}[/tex] is already a balanced chemical equation.
The given chemical equation [tex]3H_{2} SO_{4} + 2Fe[/tex] → [tex]Fe_{2} (SO_{4} )_{3} + H_{2}[/tex] is not a balanced chemical equation because number of hydrogens are not same on both sides. Balanced chemical equation for this reaction will be [tex]3H_{2} SO_{4} + 2Fe[/tex] → [tex]Fe_{2} (SO_{4} )_{3} + 3H_{2}[/tex] .
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Life relies on two key reactions: the oxidation of glucose to produce co2 and water and the reaction of co2 and water to produce glucose. these reactions are?
These reactions are exergonic and endergonic.
An exergonic is spontaneous reaction. It occurs without the addition of external energy. ΔG (the change in Gibbs free energy) is negative.
An endergonic reaction requires free energy to proceed. ΔG (the change in Gibbs free energy) is positive.
Balanced chemical equation for reaction of the oxidation of glucose:
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + energy
C₆H₁₂O₆ is molecule of glucose
O₂ is molecule of oxygen
Balanced chemical equation for reaction of the production of glucose:
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂.
Plants convert solar energy into the chemical energy of sugars.
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Which of the following best describes the wagon’s change in energy as it coasts from point X to point Y?
From the question, we can see that; the wagon has more gravitational potential energy at point Y than point X.
What is energy?We know that energy is the ability to do work. Work is said to be done when the force applied moves a distance in the direction of the force. In this case, we could say that there are several forms of energy such as;
Mechanical energyElectrical energyChemical energy Sound energy and others.We also know that according to the laws of thermodynamics, energy could be transformed from one form to another. Energy can not be created nor destroyed. This is the summary of the first and second laws of thermodynamics.As such, we can see that the Wagon is at higher elevation at point Y than on point X. Recall that the gravitational potential energy has to do with the height of the object.
Having said all these, it is now possible to conclude that; the wagon has more gravitational potential energy at point Y than point X.
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The valence orbitals of a central atom surrounded by three regions of electron density consist of a set of _________ sp2 hybrid orbitals.
The valence orbitals of a central atom surrounded by three regions of electron density consist of a set of three sp2 hybrid orbitals.
In sp2 hybridization the one s-orbital mixes with only two 2p-orbitals and form three sp2 hybrid orbitals (see the picture below).
When atomic orbitals hybridize, the valence electrons occupy the hybrid orbitals.
For example, central boron atom in boron hydride (BH3) has three sp2 hybrid orbitals. The molecule of boron hydride is trigonal planar. The boron atom form three single bonds with hydrogen atoms. The approximate H-B-H bond angle is 120°.
Other examples are molecules C2H4 (ethene), ClNO (nitrosyl chloride) and CH2O (formaldehyde).
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What is the actual, significant effect of 2,3-bisphosphoglycerate on oxygen binding by hemoglobin?
The actual, significant effect of 2,3-bisphosphoglycerate on oxygen binding by hemoglobin is Kd for oxygen increases in peripheral tissues.
Kd is a dissociation constant.
A lower dissociation constant (Kd) means tighter binding of oxygen.
When 2,3-bisphosphoglycerate (2,3-BPG) levels increase, hemoglobin release oxygen.
2,3-Bisphosphoglycerateis a three carbon isomer of the glycolytic intermediate 1,3-bisphosphoglycerate. It is present in human red blood cells (erythrocyte).
2,3-bisphosphoglycerate interacts with deoxygenated hemoglobin and decrease his affinity for oxygen, so it allosterically promotes the release of the remaining oxygen molecules.
2,3-bisphosphoglycerate promotes oxygen release in peripheral tissues.
Hemoglobin is the oxygen-transport metalloprotein in erythrocytes that contains iron ions.
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Suppose that when you exercise, you consume 100 g of glucose and that all the energy released as heat remains in your body at 37 c. what is the change in entropy of your body?
The change in entropy of our body will be 5.03 kJ.
Entropy is a thermodynamic function that tells us about the degree of disorder of a particular system. It is represented using the letter “S”.
The change in entropy of a system is given by the following equation
ΔS = ΔH/T
Here ΔH is the heat released
T is the temperature of the system
In the given case, glucose is given.
The value of ΔH for one-mole glucose is 2808 kJ/mol.
The mass of one-mole glucose is 180 g, therefore 100 g of glucose has
ΔH = 2808/180 x 100 = 1560 kJ/mol.
Putting ΔH= 1560 kJ and T= 37° C = 310 K in the above equation
ΔS = 1560/310
ΔS = 5.03 kJ/K
Thus, the change in entropy of our body will be 5.03 kJ.
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8. For water, propane, and carbon dioxide, compare the heat of fusion to the heat of
vaporization. What patterns do you see? Do you think these patterns hold true for
other substances as well? Why is vaporization greater than fusion in every case?
The heat of vaporization is always greater than the heat of fusion because gas molecules have the largest intermolecular space and lowest intermolecular interaction.
What is latent heat?The term latent heat refers to the kind of heat that can not be detected hence the term ‘latent’. It is the heat that does not lead to temperature change. Rather the heat energy is used to break up the secondary bonds that hold the molecules and the bonds that hold the substance together in order to free the molecules of the substance.
Now if we consider water, propane, and carbon dioxide. We could see that water has the strongest intermolecular force followed by carbon dioxide and then propane. This is because water molecules are held together by hydrogen bonds while the propane molecules are only held together by the weak Van Der Walls forces.
We can now see that when we compare the heats of heat of fusion to the heat of vaporization, the heat of vaporization is always greater than the heat of fusion because gas molecules have the largest intermolecular space and lowest intermolecular interaction.
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When performing an extraction with between an aqueous solution and organic solution what determines which layer ends up the bottom layer in the separatory funnel?.
When performing an extraction with between an aqueous solution and organic solution density determines which layer ends up the bottom layer in the separatory funnel.
A separatory funnel is used to separate liquids.
Liquid with greater density will end up the bottom layer in the separatory funnel.
Water is polar substance as the аqueous layer, while organic layer is nonpolar substance.
Water is a “universal" solvent.
Density is the mass of an object divided by its volume. The SI derived unit for density is the kilogram/cubic meter, but chemist usually use gram per milimeter.
Volume is the amount of space that a substance occupies.
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Which elements are not likely to bond with other elements? Why
