The following statements are true about the hydration process: Hydration is a solvation process where the solvent is water, The hydration involves breaking ionic solid and mixing in solvent,The process is generally exothermic.
Hydration is a process in which an ionic solid (typically a salt) dissolves in water to form a solution. In the process, water molecules surround and hydrate individual ions, separating them from each other and allowing them to mix uniformly in the solvent. This process is driven by the attractive forces between the positive and negative ions and the water molecules, which can cause the release of energy in the form of heat. As a result, hydration is generally exothermic, meaning that it releases heat. This can be seen as the solution becoming warm when a salt is dissolved in water. The release of heat is due to the breaking of ionic bonds in the solid and the formation of new bonds between the ions and the water molecules.
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how many grams are in 4.9 moles of KCI
360 grams
365.54 grams
15.22 grams
0.066 grams
The mass of the compound that we have is 365.54 grams. Option B
What is the mole?The mole (mol) is the SI unit for measuring the amount of a substance in chemistry.
The mole is used to convert between mass, moles, and number of entities, allowing chemists to work with the macroscopic amounts of substances they need to, while still having a convenient way of expressing their composition at the molecular level.
Now we know that;
Molar mass of KCl = 75 g/mol
Mass of the compound = 4.9 moles * 74.5 g/mol
= 365.54 grams
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What can be said about the differences between the two types of water?A. There are no differences between the two types of water. B. Tap water is more acidic than bottled water. C. Bottled water is more acidic than tap water, D. There is not enough information to determine a conclusion
The difference between in the two types of the water is the correct option is : C. Bottled water is more acidic than tap water
The Pure water has a pH of 7 and that is considered as the neutral because it is neither the acidic nor the basic qualities. The pH scale ranges from the 0 to 14 . Th epH value which is less then the 7 is considered as the acidic in nature. The pH value greater than the 7 is said to be basic in nature. The pH value of the 7 is the neutral value it means the water is neither the acidic nor the basic.
Thus, Bottled water is more acidic than tap water and the tap water is safer than the bottled water.
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what volume of 0.1500 m 4 would be required to fully react with 1.000 g of formic acid (2) in acid solution
The volume of 0.1500 M CO2 required to fully react with 1.000 g of formic acid is approximately 483.8 mL.
The balanced chemical equation for the reaction between CO2 and formic acid (HCOOH) in an acid solution is:
CO2 + HCOOH -> H2CO3 + H2O
The molar mass of formic acid (HCOOH) is 46 g/mol. Therefore, 1.000 g of formic acid is equal to 1.000 g / 46 g/mol = 0.02174 mol.
The molar ratio of CO2 to formic acid in the reaction is 1:1. Therefore, the number of moles of CO2 required to react with 0.02174 mol of formic acid is 0.02174 mol.
The volume of a gas can be calculated using the Ideal Gas Law:
PV = nRT,
where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in kelvins.
Assuming standard temperature and pressure (STP) conditions of 0°C and 1 atm, the volume of 0.02174 moles of CO2 can be calculated as:
V = nRT / P
V = (0.02174 mol) * (0.08206 Latm/molK) * (273.15 K) / (1 atm)
V = 0.4838 L = 483.8 mL
So, the volume of 0.1500 M CO2 required to fully react with 1.000 g of formic acid is approximately 483.8 mL.
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Is the distribution of electrons in the sodium-chlorine bond and the carbon- chlorine bond the same? For each case, describe how the electrons that make up the bond are distributed between the two atoms.
The distribution of electrons is not the same in sodium-chlorine bonds and carbon-chlorine bonds (electronic configuration)
The electronic configuration of sodium chlorine
sodium atom is 2, 8, 1
chlorine atom is 2, 8, 7
Carbon chlorine
Carbon - 2,8,2
Chlorine - 2,8,7
Electronic Configuration refers to how the electrons are the distribution of electrons within an atom. The greatest number of electrons that can be found in an orbit can be calculated using the formula 2n2, where n is the orbit number. The formula also referred to as "Bohr Bury Schemes," aids in figuring out how electrons are arranged in the distribution of electrons.
In order to determine the distribution of electrons by the electrical configuration of cations, electrons are first removed from the outermost p orbital, then from the s orbital, and finally from the d orbitals (if any more electrons need to be removed)
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Sodium reacts violently in chlorine gas to form sodium chloride. If 2.5 mol of Na and 1.1 mol of Cl2 are placed in a flask and allowed to react, how much sodium chloride could be formed?2Na + Cl2→ 2NaClA) 2.5 mol because the amount of product is determined by the limiting reactant, sodiumB) 3.6 mol because the moles of reactants must equal the moles of productsC) 2.4 mol because 2 mol NaCl form for each 3 mol of reactants that reactD) 2.2 mol because the amount of product is determined by the limiting reactant, chloride
If the 2.5 mole of Na and 1.1 mol of Cl₂ .The sodium chloride could be formed is D) 2.2 mol because the amount of product is determined by the limiting reactant, chloride.
The balanced equation is :
2Na + Cl₂ -----> 2NaCl
The moles of the Na = 2.5 mol
The moles of the Cl₂ = 1.1 mol
1 mole of the Cl₂ react with the 2 moles of the Na
The moles of the Na = 2 × 1.1
The moles of the Na = 2.2 mol
Thus, the Cl₂ is the limiting reactant.
The mole of the NaCl = 2 × 1.1
The mole of the NaCl = 2.2 mol.
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suppose both the bond enthalpy and the heat of sublimation of were bigger. would be more stable? or less?
Explanation:
=> The simplest form of
56
:
98
56:98 is
4
:
7.
4:7.
Step-by-step explanation:
Given ratio -
56
:
98
56:98
We have to reduce it to its simplest form,
For that, we have to find the GCD of the numerator as well as the denominator:
So, the GCD for
56
56 and
98
98 is
14.
14.
Now, divide both the numerator and denominator by the GCD:
=
>
56
÷
14
98
÷
14
=>
98÷14
56÷14
=
>
4
7
=>
7
4
Hence, the simplest form is
4
:
7.
4:7.
An object with a mass of 1609 kg is accelerating at a rate 32 m/s when a net force that is acting on the object
The net force acting on an object with a mass of 1609 kg is accelerating at a rate 32 m/s² is 51488 N
What is a net force?The vector sum of the forces exerted on a particle or object is known as the net force. The original forces' impact on the motion of the particle is replaced by the net force, which is a single force.
For an object at rest or moving in constant motion, there is no net force acting on the object.
However, a net force acts on an object when it is accelerating.
The net force acting on an object with a mass of 1609 kg is calculated below:
Net force = mass * acceleration
Net force - 1609 * 32
Net force = 51488 N.
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ozone is made up of ----- oxygens and is formed when ---- question 2 options: two, oxygen gas reacts with sunlight and mechanical discharges in the atmosphere three, oxygen gas reacts with sunlight and electrical discharges in the atmosphere. two, nitrogen gas reacts with uv light and electrical discharges in the atmosphere. three, oxygen gas reacts with uv light and mechanical discharges in the cryosphere.
Ozone is made up of three oxygens and is formed when two, oxygen gas reacts with sunlight and electrical discharges in the atmosphere.
Ozone is an important component of the Earth's atmosphere as it helps to protect us from the harmful ultraviolet (UV) radiation from the Sun. It is formed when oxygen molecules in the atmosphere are split apart by UV radiation, resulting in two oxygen atoms that then combine with an oxygen molecule to form ozone. This process is known as photochemical smog and occurs mainly in the lower atmosphere. Ozone is also formed in the upper atmosphere from electrical discharges from lightning, and from chemical reactions between nitrogen oxides and hydrocarbons.
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1. The volume of blood plasma in adults is 3.1 L The density of blood plasma is 1.03 g/cc: How many pounds of blood plasma are there in the average adult body? (Hint: You can use the density of as a conversion factor once You convert to units of volume).
The average adult body has 3.1 litres of blood plasma with a density of 1.03 g/cc.
What is blood plasma?About 55% of the total volume of blood in a human being is made up of blood plasma, a yellowish fluid.
How do you determine it?We must multiply the volume by the density to determine the weight of the blood plasma in pounds before converting the result.
The volume is first converted from litres to cubic centimetres as follows: 1,000 ml/liter times 3.1 litres equals 3,100 cc.
The weight in grammes is then calculated by dividing the volume in cc by the density in g/cc: 3,100 cc times 1.03 g/cc equals 3,193 g.
The weight in grammes is then converted to pounds as follows: 4,54 g/lb / 3,193 g = 7.01 lb.
As a result, the average adult's body has about 7.01 pounds of blood plasma.
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If the AGº for ATP hydrolysis is -30 kJ/mol and the AG" for phosphoenolpyruvate hydrolysis is -62 kJ/mol, what is the AGº for the phosphorylation of ADP by phosphoenolpyruvate? -92 kJ/mol +31 kJ/mol +92 kJ/mol -62 kJ/mol -32 kJ/mol
The AGº for the phosphorylation of ADP by phosphoenolpyruvate is equal to 32 kJ/mol.
The AGº for the phosphorylation of ADP by phosphoenolpyruvate can be calculated using the equation:
AGº = AGº (ATP hydrolysis) - AGº (phosphoenolpyruvate hydrolysis)
Given that AGº (ATP hydrolysis) = -30 kJ/mol and AGº (phosphoenolpyruvate hydrolysis) = -62 kJ/mol, then:
AGº = -30 kJ/mol - (-62 kJ/mol) = 32 kJ/mol
NADH: An increase in the concentration of NADH can inhibit PDH, as it competes with pyruvate for binding to the active site of the enzyme.
Acetyl-CoA: An increase in the concentration of acetyl-CoA can also inhibit PDH, as it acts as an allosteric inhibitor
Therefore, the AGº for the phosphorylation of ADP by phosphoenolpyruvate is equal to 32 kJ/mol.
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The solubility of CuCl2(s) would ______ with increasing solvent temperature.
CuCl2(s) would be more soluble as the solvent temperature rose.
What happens to a solid substance's solubility when the temperature rises?The average kinetic of the solutes increases along with the solution's temperature. As a result, the molecules have a lower ability to bind together and dissolve more easily. Therefore, when temperature rises, solid states become more soluble.
Do temperature fluctuations affect solubility?Temperature affects a given solute's potential to dissolve in some kind of a particular solvent. The permeability of liquids and particles rises with temperature. Similar to liquids, gases become less soluble as temperature rises.Dissolution rate of the solute will consequently increase as temperature rises.
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soda has a ph of about 3, while black coffee has a ph of about 5. how much more acidic is soda than coffee?
The soda with a pH of 3 is 100 times more acidic than the coffee with a pH of 5
How do I know how much acidic is soda than coffee?To determine how much acidic is soda than coffee, we shall obtain the hydrogen ion concentration [H⁺] of each liquid. Details below:
For soda:
pH of soda = 3 Hydrogen ion concentration [H⁺] = ?pH = -Log [H⁺]
3 = -Log [H⁺]
Multiply through by -1
-3 = Log [H⁺]
Take the anti-log of -3
[H⁺] = Anti-log -3
[H⁺] = 0.001 M
For coffee:
pH of coffee = 5 Hydrogen ion concentration [H⁺] = ?pH = -Log [H⁺]
5 = -Log [H⁺]
Multiply through by -1
-5 = Log [H⁺]
Take the anti-log of -5
[H⁺] = Anti-log -5
[H⁺] = 0.00001 M
Finally, we shall determine how much acidic is soda than coffee. Detais below:
Hydrogen ion concentration for soda = 0.001 MHydrogen ion concentration for coffee = 0.00001 M[H⁺] for soda / [H⁺] for coffee = 0.001 / 0.00001
[H⁺] for soda / [H⁺] for coffee = 100
Cross multiply
[H⁺] for soda = 100 × [H⁺] for coffee
Thus, we can conclude that the soda is 100 times more acidic
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Identify the type of reaction:
KBr + AgNO3 → AgBr + KNO3
ооо
Single Replacement
Synthesis
Decomposition
Double Replacement
Answer: Double Replacement
Explanation:
This is double replacement.
KBr + AgNO₃ ⇒ AgBr + KNO₃
On the left side K is paired with Br. On the right side K is paired with NO₃.
On the left side Ag is paired with NO₃. On the right side Ag is paired with Br.
The cations, K and Ag, "switched partners" in the reaction.
vanillin is the main flavor and aroma component of vanilla. it has a δhvap of 55.29 kj/mol and a normal boiling point of 558 k. if the pressure is lowered to 0.151 atm, what is the new boiling point?
A substance's boiling point is related to its usual boiling point and the pressure at which it is boiling. The Clausius-Clapeyron equation may be used to calculate a substance's boiling point.
at a given pressure: Hvap / (RT2) = dlnP/dT Where Hvap is the vaporization heat, R is the gas constant (8.314 J/molK), T is the temperature in Kelvin, and P is the atmospheric pressure. We may find the connection between the boiling point and the pressure by integrating the previous equation: Hvap / R * (1/T1 - 1/T2) ln(P2/P1) Where P1 is the normal boiling point pressure and P2 is the new boiling point pressure. We may get the new boiling point by rearranging the equation: T2 = T1 * (P1 / P2)^(R substance's boiling point is related to its usual boiling point and the pressure at which it is boiling. The Clausius-Clapeyron equation may be used to calculate a substance's boiling point.
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earth's first atmosphere (some 4.6 billion years ago) was probably composed of . a. hydrogen, helium, methane, and ammonia b. the same gas mix as seen in our present atmosphere c. nitrogen, carbon dioxide, and water vapor d. mostly argon and nitrogen
Earth's first atmosphere some 4.6 billion years ago was probably composed of hydrogen ,helium ,methane and ammonia.
Because these were the primary gases in the dusty, gassy disk around the Sun from which the planets were formed, it is likely that hydrogen and helium comprised Earth's initial atmosphere. The atmosphere and the Earth were extremely hot.
When heated, hydrogen and helium molecules move very quickly. In fact, they moved so quickly that they eventually drifted away from Earth and into space.
Scientists believe that Earth collided with a planet the size of Mars about 4.5 billion years ago. Our Moon was created as a result of this catastrophic collision, and the entire planet melted as a result of the energy from the collision.
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another potential future fuel is methanol (ch3oh) . write a balanced equation for the combustion of gaseous methanol. express your answer as a chemical equation.
The combustion reaction of methanol to form carbon dioxide and water is written as follows:
[tex]\rm CH_{3}OH + \frac{3}{2} O_{2} \rightarrow CO_{2} + 2 H_{2}O[/tex].
What is combustion ?Combustion is a type of reaction, in which a gas reacts with atmospheric oxygen to produce carbon dioxide and water. It is an exothermic reaction thus, produce heat energy to the surroundings.
Methanol is the simplest alcohol having many industrial uses. Methanol easily reacts with atmospheric oxygen to give one mole of carbon dioxide and 2 moles of water as written in the balanced chemical equation above.
The number of moles of oxygen is 4 on each side. Where the number can be balanced by multiplying with suitable integers. Therefore, the coefficient of oxygen being 3/2.
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suppose you found out that i = 3.11 for some unknown acid. what could you conclude about the dissociation of the acid? how many hydrogen atoms can dissociate from the acid?
With a pKa of 3.11, the unidentified acid is partially dissociated in solution, which means that some of the hydrogen atoms in the solution are no longer bound to the acid.
the molecule's atoms have split apart to create hydrogen ions (H+) and the matching anion. There are 0.0498 moles of hydrogen ions that have dissociated. The strength of an acid in solution is determined by the ionization constant (pKa). The strength of the acid increases with decreasing pKa, which means that it dissociates more easily and generates more hydrogen ions (H+) in solution. A greater pKa value, on the other hand, indicates that the acid is weaker and less likely to dissociate.
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how many electrons are required to reduce cytochrome c
Four electrons are required to reduce cytochrome c.
Cytochrome c is a small, heme-containing protein that plays an important role in the process of cellular respiration. In cellular respiration, electrons are transferred from molecules of fuel, such as glucose, to oxygen, with the help of cytochrome c and other proteins.
Cytochrome c acts as an electron carrier, transferring electrons from one protein to another in a series of redox (reduction-oxidation) reactions. In each redox reaction, electrons are removed from one molecule (the oxidized form) and added to another molecule (the reduced form). In the case of cytochrome c, it must be reduced four times, meaning that it must accept four electrons in total.
Each electron that is added to cytochrome c changes the oxidation state of the iron atom in its heme group, reducing it from the oxidized form (Fe3+) to the reduced form (Fe2+). This process allows cytochrome c to transfer electrons from one protein to another, until they eventually reach oxygen and are used to form water.
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Helllpppp! this is a study island and im stuck :(
It is clear from the tabular data that, the monkeys in troop 2 were better to avoid predators and more of them were able to reproduce. Hence, option D is correct.
What is natural survival ?In the biosphere, not all living things are fit to survive for a longer life time. Most of them are pray of other higher level animals. Some organisms adopt some strategies to hide from their predators and they can survive more.
It is clear from the table that, the monkeys residing in the ground are more prone to the attacks by their predators. Whereas monkeys living in trees can survive more.
In each year the survival rate is increasing for both troop. However the more number of monkeys which can sustain their population is in troop 2. Therefore, option D is correct.
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a volume of 70.0 ml of aqueous potassium hydroxide ( koh ) was titrated against a standard solution of sulfuric acid ( h2so4 ). what was the molarity of the koh solution if 20.7 ml of 1.50 m h2so4 was needed? the equation is
The molarity of the KOH solution if 20.7 ml of 1.50 m H₂SO₄ was needed is 0.04347 M
Let's think about how KOH and H₂SO₄ neutralize one another.
2 KOH + H₂SO₄ → K₂SO₄ + 2 H₂O
12.7 mL of 1.50 M H₂SO₄ react. The reacting moles of H₂SO₄ are:
0.0027 L × 1.50 mole/L = 0.03105 mole
KOH and H₂SO₂ have a molar ratio of 2:1. so,
2 x 0.03105 mole = 0.0621 mole are the reactive moles of KOH.
Then we can calculate the molarity of KOH
molarity = moles x volume
Molarity KOH = 0.0621 mole x 70.0 ml = 0.04347 M
Therefore, The molarity needed is 0.04347 M
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consider polonium metal, the only metal under to exhibit the simple cubic crystal structure at stp conditions. what is the maximum diameter of sphere, in pm, that would fit perfectly within the interstitial space (empty space) in the middle of the simple cubic unit cell? the atomic radius of polonium is 190 pm (picometers).
The maximum diameter of a sphere polonium metal that would fit perfectly within the interstitial space of a simple cubic unit cell can be calculated as the distance between two opposite corners of the unit cell, which is equal to the edge length of the unit cell. The edge length of the simple cubic unit cell can be calculated as follows:
Edge length = 2 * atomic radiusEdge length = 2 * 190 pm = 380 pmTherefore, the maximum diameter of the sphere polonium metal that would fit perfectly within the interstitial space of the simple cubic unit cell of polonium is 380 pm.
About Polonium MetalPolonium Metal was used in nuclear experiments with elements such as beryllium which release neutrons when bombarded by alpha particles. In printing and photographic equipment, polonium is used in devices that ionize air to dissipate electrostatic charge buildup.
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following is the mass spectrum of 2-methylpentane. propose a structural formula for the cation of m/z 57.
The cation of m/z 57 in the mass spectrum of 2-methylpentane is likely to be [CH3CH2CH2CH2+]. This is because the loss of a methyl group from the 2-methylpentane molecule would result in a cation with a mass of 57.
The branched-chain alkane 2-methylpentane, also referred to as isohexane, has the chemical formula C6H14. This methyl group-bonded second carbon atom in a pentane chain makes it a structural isomer of hexane. Using a prediction model for the quantitative structure-activity relationship (QSAR), The research octane number (RON) of 2-methylpentane is 75, the motor octane number (MON) is 77, and the cetane number (CN) is 29. Mr. William M. Haynes (2010). Handbook of Physics and Chemistry (91 ed.). CRC Press, Boca Raton, FL, USA, p. 3-364, ISBN 978-1-43982077-3."Compound Summary for 2-methylpentane." the compound PubChem. National Center for Biotechnology Information, United States. 26 March 2005. Identity and associated records. obtained on March 5, 2012.Chemohazards Pocket Guide from NIOSH. Occupational Safety and Health National Institute (NIOSH).
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the aqueous aluminum sulfate formed is crystalized to make hydrated aluminum sulfate, Al2(SO4)3xH2O.
the relative formula mass of hydrated aluminum sulfate is 666.
calculate the value of x in the given formula.
(pls solve w explanation)
In the crystalized form of aluminum sulfate, Al₂(SO₄)₃xH₂O, the value of x which represents the molecules of water is approximately 6.
How to find water per sulfate?The formula mass of Al₂(SO₄)₃ can be calculated as follows:
Al = 2 x 26.98 = 53.96 g/mol
S = 3 x 32.06 = 96.18 g/mol
O = 12 x 16.00 = 192.00 g/mol
Total formula mass = 53.96 + 96.18 + 192.00 = 342.14 g/mol
The relative formula mass of hydrated aluminum sulfate is 666, so the mass of water in the formula can be calculated as:
mass of water = 666 - 342.14 = 323.86 g/mol
Since the formula for water is H₂O, the number of water molecules in the formula can be calculated as:
number of H₂O molecules = 323.86/18.02 = 17.92
Since there are 3 sulfate ions in the formula, the number of water molecules per sulfate ion can be calculated as:
number of H₂O per sulfate = 17.92/3 = 5.97
Therefore, the value of x in the formula Al₂(SO₄)₃xH₂O is 6 (rounded up).
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During a Chemistry Lab on gas laws, Kara was investigating the gas inside a syringe with a volume of 6.95 cm3. The gas pressure was 696 mm Hg. What pressure will the gas have if the plunger is pressed and the syringe volume decreases to 3.35 cm3?
According to Boyle's law, the new pressure of the gas at constant temperature is 14434.94 mm Hg.
What is Boyle's law?Boyle's law is an experimental gas law which describes how the pressure of the gas decreases as the volume increases. It's statement can be stated as, the absolute pressure which is exerted by a given mass of an ideal gas is inversely proportional to its volume provided temperature and amount of gas remains unchanged.
Mathematically, it can be stated as,
P∝1/V or PV=K.
According to the equation the unknown pressure and volume of any one gas can be determined if two gases are to be considered.That is,
P₁V₁=P₂V₂, on substitution P₂=696×6.95/3.35=1443.94 mm Hg.
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the phase diagram for an organic compound is shown. the pressure is measured from 0 to 1 atmosphere on the y-axis and the temperature is measured from minus 200 to 200 degrees celsius on the x-axis. a curve starts at 0.2 atmospheres at minus 210 degrees, goes parallel to the x-axis until minus 65 degrees, and increases until the triple point at 0.4 atmospheres at 10 degrees. then the curve divides into two branches. the first branch goes up and slightly to the left until 1.3 atmospheres at minus 75 degrees. the second branch goes to 0.7 atmospheres at 170 degrees and then increases until 1.2 atmospheres at 220 degrees. as a result, the part of the plot, which is arranged between the y-axis, the initial curve, and the first branch, represents phase x. the part arranged between the branches represents phase y. the part arranged between the x-axis, the initial curve, and the second branch represents phase z. what is the normal boiling point of this compound?
Assuming at atmospheric pressure 1 atm the boiling temperature will be 150 degrees celcius.
Phase diagram summarizes the effect of temperature and pressure on a substance in a closed container. Every point in this diagram represents a possible combination of temperature and pressure for the system. The diagram is divided into three areas, which represent the solid, liquid, and gaseous states of the substance.
The normal boiling point of a liquid is the temperature at which the liquid and gas are in equilibrium at 1 atm pressure and the vapor pressure of the liquid is therefore equal to 1 atm.
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the formula mass of a compound is 108 g/ mole, what is the mass for 1.00 mole of this compound? g ( only input a number as your answer)
If the formula mass of a compound is 108 g/mole, then the mass of 1.00 mole of this compound will be 108 g.
The mass of a compound can be determined by its formula mass and tnumberunt of moles of the compound. For example, if the formula mass of a compound is 108 g/mole, then the mass of 1.00 mole of this compound will be 108 g/mole x 1.00 mole, which equals 108 g. This means that for 1.00 mole of this compound, the mass will be 108 g.
To determine the mass for a different quantity of moles, simply multiply the formula mass by the number of moles.
For example, if the number of moles was 2.00, the mass of the compound would be 108 g/mole×2.00 moles, which equals 216 g. Similarly, if the number of moles was 0.50, the mass of the compound would be 108 g/mole×0.50 moles, which equals 54 g.
Therefore, the mass of a compound can be determined by its formula mass and the number of moles of the compound. For example, if the formula mass of a compound is 108 g/mole, then the mass of 1.00 mole of this compound will be 108 g.
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Please help with this question. I really do not know how to do it?
Answer:
Explanation:
Oh, let me rephrase it:
How much copper sulfate (salt) would you expect in comparison AlSO4 if you had mixed copper instead of aluminium with sulfuric acid?
Just answer like: I would expect more/less than when adding aluminum.
one prediction of global warming is the melting of global ice, which may result in coastal flooding. a criticism of this prediction is that the melting of icebergs does not increase ocean levels any more than the melting of ice in a glass of water increases the level of liquid in the glass. is this a valid criticism? does the melting of an ice cube in a cup of water raise the level of the liquid in the cup? why or why not
Yes, this is a valid criticism. The melting of an ice cube in a cup of water does not raise the level of the liquid in the cup because the ice cube was already displacing the same volume of the liquid before it melted.
The same is true for icebergs melting in the ocean - the melting of the iceberg does not increase the volume of water in the ocean, so it does not cause a rise in sea levels.
Additionally, the warming of the ocean temperatures can cause the ocean to expand, further increasing the ocean's volume and causing sea levels to rise. This can have disastrous consequences, as it could lead to flooding of coastal areas and displacement of people living in those areas.
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An exce of Al and 6. 0 mom of Br2 are reacted according to the equation How many mole of AlBr3 will be formed auming 100% yield
An excess of Al and 6. 0 mol of Br₂ are reacted according to the equation. There would be 4 moles of AlBr₃ will be formed asuming 100% yield.
First we should write the equation for the reaction between Al and Br₂ is:
2Al + 3Br₂⇒ 2AlBr₃
The reactant has excess aluminum so bromine would be the limiting reagent.
From the equation we know that 2 moles of aluminum reacted with 3 moles of bromine produce 2 moles of AlBr₃. so with unitary method we can calculate the moles of AlBr₃.
Moles AlBr₃ = 2/3 x moles Br
Moles AlBr₃ = 2/3 x 6. 0 moles
Moles AlBr₃ = 4 moles.
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(b) In another experiment Penny obtained white crystals of potassium carbonate, K,CO₂,
from
(1) Show that the percentage by mass of potassium in K₂CO3 is 56.6.
[2]
(ii) Some of Penny's crystals were analysed for potassium by flame emission
spectroscopy. The results showed that the percentage of potassium present was
44.9%.
Penny suggested that the crystals of potassium carbonate might be a hydrate,
K₂CO3.2H₂O.
Explain why the percentage of potassium in the hydrate is lower than the value
[1]
stated in (1).
Answer:
(b) (i) To determine the percentage by mass of potassium in K₂CO3, we can use the molar masses of the individual elements in the compound. The molar mass of K₂CO₃ is 138.21 g/mol. The molar mass of potassium is 39.098 g/mol and the molar mass of carbon and oxygen is 12.01 and 16.00 respectively.
The mass of potassium in K₂CO₃ is 2*39.098 = 78.196 g
The mass of K₂CO₃ is 138.21 g
percentage of potassium in K₂CO₃ = (mass of potassium / mass of K₂CO₃) * 100 = (78.196 / 138.21) * 100 = 56.6%
(b) (ii) If the crystals of potassium carbonate are a hydrate, K₂CO₃.2H₂O, it means that there is water molecules present in the crystal structure. The mass of water in the hydrate will not contribute to the percentage of potassium in the hydrate. Therefore, the percentage of potassium in the hydrate will be lower than the value stated in (1)
