The enthalpy for the following reaction Ca (s) + 2 H₂O → Ca(OH)₂(s) + H₂ (g) is -365kJ.
What is enthalpy?A thermodynamic system's enthalpy, which is one of its properties, is calculated by adding the system's internal energy to the product of its pressure and volume. It is a state function that is frequently employed in measurements of chemical, biological, and physical systems at constant pressure, which the sizable surrounding environment conveniently provides. The pressure-volume concept describes the effort needed to create space for the system by displacing its surrounds in order to determine its physical dimensions.For solids and liquids under typical conditions, the pressure-volume term is relatively tiny, whereas it is only somewhat small for gases. As a result, in chemical systems, enthalpy serves as a stand-in for energy; for example, in chemistry, "energies" like bond, lattice, and solvation are actually differences in enthalpy.
The enthalpy for the reaction Ca (s) + 2 H₂O (1) -> Ca(OH)₂ (s) + H₂ (g) is -365 kJ. This can be calculated by using the calculated enthalpy values of the three given reactions above and the law of Hess's.
First, let's look at the given reactions:
2 H₂ (g) + O₂ (g) → 2 H₂0
ΔH° = -572 kJ
Ca (s) + ½ O₂ (g) →CaO (s)
ΔH° = -635 kJ
CaO (s) + H2O → Ca(OH)₂ (s)
ΔH° = -64 kJ
Now let's calculate the enthalpy for the reaction Ca (s) + 2 H2O (1) -> Ca(OH)₂ (s) + H₂ (g):
ΔH° = [2(-64 kJ) + (-572 kJ) + (-635 kJ)] - (-572 kJ + (-64 kJ + (-635 kJ))
ΔH° = -365 kJ
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Question 4 (1 point)
Members of the alkaline earth elements have several things in common.
They are metalloids with two valence electrons.
metals that are not very reactive.
nonmetals and are nonreactive.
metals with two valence electrons.
Answer:
Explanation:
Alkaline earth elements are a group of six chemical elements in group 2 of the periodic table. They are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). These elements have very similar properties: they are all shiny, silvery-white, somewhat reactive metals at standard temperature and pressure.
The correct statement about alkaline earth elements is that they are metals with two valence electrons. They readily lose these two electrons to form cations with a charge of +21.
Determine the freezing point of an aqueous solution that is 0.24 m in sucrose.
An solution of antifreeze is prepared by mixing 47.0mL of ethylene glycol (d = 1.11 g/mL; molar mass = 62.07 g/mol) with 50.0 mL H2O (d = 1.00 g/mL) at 25°C. If the density of the antifreeze solution is 1.07 g/mL, what is its molarity?
If the density of antifreeze solution is 1.07 g/mL, then the molarity of the antifreeze solution is calculated as 8.66 M.
What is meant by molarity?Number of moles of solute dissolved per liter of the solution is defined as molarity.
As we know, moles of EG = mass of EG / molar mass of EG
Mass of EG = 47.0 mL × 1.11 g/mL = 52.17 g
Moles of EG = 52.17 g / 62.07 g/mol = 0.840 mol
Total volume = 47.0 mL + 50.0 mL = 97.0 mL
So, mass of solution = volume of solution × density of solution
mass of solution = 97.0 mL × 1.07 g/mL = 103.79 g
As, molarity =moles of solute /volume of solution
Molarity = 0.840 mol / (97.0 mL / 1000 mL/L) = 8.66 M
Therefore, the molarity of the antifreeze solution is 8.66 M.
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please help, dont understand
According to the question, there are 5.857 x 10¹¹ molecules of C₁₂H₂₂O₁₁ in 205g of sucrose.
What is molecules?Molecules are the building blocks of all matter. They are composed of one or more atoms that are held together by covalent bonds, which are formed when electrons are shared between atoms. Molecules can exist as individual entities, but they often combine with other molecules to form larger structures, such as proteins, carbohydrates, and lipids. Molecules can also be found in all living things, from the smallest bacteria to the largest mammals.
This is calculated by taking the molecular weight of sucrose (342.34 g/mol) and dividing it by 205, the mass of the sucrose. This yields a ratio of 1 mol sucrose/ 1.6943 g sucrose. Multiplying this ratio by 205 yields 342.34 mol sucrose, which when multiplied by Avogadro's Number (6.022 x 10²³ mol) yields 5.857 x 10¹¹ molecules of C₁₂H₂₂O₁₁.
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What is the basic mechanism of immunohistochemistry technique?
Answer:
I hope this helps :)
Explanation:
Immunohistochemistry (IHC) is a powerful technique that exploits the specific binding between an antibody and antigen to detect and localize specific antigens in cells and tissue, most commonly detected and examined with the light microscope.Jan 1, 2020
How many molecules are in 59.7 molecules of CO2
There are approximately 3.59 x [tex]10^{25}[/tex] molecules of [tex]CO_{2}[/tex] in 59.7 moles of [tex]CO_{2}[/tex].
What is Molecules?
Molecules are the smallest units of a chemical compound that retain the chemical properties and characteristics of that compound. They are composed of two or more atoms chemically bonded together. Molecules can be made up of atoms of the same element (as in diatomic molecules like oxygen gas, [tex]O_{2}[/tex]) or different elements (as in water,[tex]H_{2}O[/tex]which consists of two hydrogen atoms and one oxygen atom).
The term "59.7 molecules of [tex]CO_{2}[/tex]" is not a meaningful unit, as molecules are discrete entities and cannot be divided into fractions. However, assuming you meant to ask for the number of molecules in 59.7 moles of [tex]CO_{2}[/tex], we can use Avogadro's number to calculate it.
Avogadro's number is approximately 6.022 x [tex]10^{23}[/tex]molecules/mol, and it represents the number of entities (such as atoms, ions, or molecules) in one mole of a substance.
Given that you have 59.7 moles of [tex]CO_{2}[/tex], we can multiply this value by Avogadro's number to obtain the total number of molecules:
59.7 moles [tex]CO_{2}[/tex] x 6.022 x [tex]10^{23}[/tex] molecules/mol ≈ 3.59 x [tex]10^{25}[/tex] molecules of [tex]CO_{2}[/tex]
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Which of the following is a way that animals can help the environment? (2 points)
a
Overpopulating
b
Producing oxygen
c
Spreading disease
d
Spreading seeds
GaAsO4 what is the ionic compound name
The ionic compound name of GaAsO4 is gallium arsenate.
Is gallium arsenate covalent or ionic?By moving three electrons from gallium to arsenic, gallium arsenide (GaAs) might be created as an insulator, however this does not happen. Gallium arsenide is a covalent semiconductor, hence the bonding is more strong sphalerite crystals in this shape are referred to as zinc blende or cubic sphalerite.
Any substance contains ions?Examples of ionic compounds include salts, oxides, hydroxides, sulphides, and the bulk of inorganic substances.. The electrostatic interaction between the positive and negative ions holds ionic solids together. As an illustration, sodium ions draw chloride ions, and chloride ions draw sodium ions.
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A solution of antifreeze is prepared by mixing 47.0mL of ethylene glycol (d = 1.11 g/mL; molar mass = 62.07 g/mol) with 50.0 mL H2O (d = 1.00 g/mL) at 25°C. If the density of the antifreeze solution is 1.07 g/mL, what is its molarity?
At 25°C, combine 47.0 mL of ethylene glycol (d = 1.11 g/mL; molar mass = 62.07 g/mol) with 50.0 mL of water (d = 1.00 g/mL) to create an antifreeze solution. The antifreeze solution's molarity is 0.0086 M if its density is 1.07 g/mL.
What is antifreeze solution?Antifreeze is an additive that reduces a water-based liquid's freezing point. To achieve freezing-point depression for cold conditions, an antifreeze combination is utilized. Common antifreezes also raise the liquid's boiling point, enabling a rise in coolant temperature. However, every typical antifreeze addition also has a lower heat capacity than water, which makes it less effective as a coolant when combined with water.
The combination of a solution's freezing and boiling temperatures depends on the amount of dissolved components present. Therefore, salts cause aqueous solutions' melting points to decrease. Although salts are widely used for de-icing, salt solutions should not be utilized in cooling systems as they cause metal corrosion. Because they typically have melting values that are lower than those of water, low molecular weight organic substances can be used as antifreeze. Alcoholic organic compound solutions, in particular, are useful. Since antifreezes were first made commercially available in the 1920s, they have all been composed primarily of alcohols such methanol, ethanol, ethylene glycol, and others.
Molarity = [tex]\frac{mole}{volume}[/tex]
To calculate the moles of ethylene glycol.
The mass of ethylene glycol is 47.0 mL × 1.11 g/mL = 52.17 g.
Since molar mass of ethylene glycol is 62.07 g/mol, the moles of ethylene glycol is:
[tex]\frac{52.17}{62.07}[/tex] = 0.84 mol
To calculate the total volume of the antifreeze solution. We know that the volumes of ethylene glycol and H₂O are 47.0 mL and 50.0 mL, respectively.
Therefore, the total volume of the antifreeze solution is 47.0 mL + 50.0 mL = 97.0 mL.
Finally, the molarity of the antifreeze solution can be calculated using the formula
Molarity = [tex]\frac{mole}{volume}[/tex]
Therefore, the molarity of the antifreeze solution is:
[tex]\frac{0.84}{97.0}[/tex] = 0.0086 M
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The "Ring of Responsibility" requires a next to water bodies. O 50-foot 43 3-foot O 5-foot O 15- to 25-foot untreated buffer zone
The "Ring of Responsibility" requires a 15- to 25-foot untreated buffer zone next to water bodies.
What is buffer zone?A buffer zone is an area of land that separates two or more countries, states, or territories, and is often demilitarized. The purpose of a buffer zone is to provide a space for negotiations and to reduce the possibility of conflict and war. Buffer zones can also be used to protect sensitive natural resources or habitats, such as areas of wilderness or wildlife. Buffer zones can be permanent or temporary, and can range in size from a few miles to hundreds of miles. In addition to physical barriers, buffer zones can also include economic, political, and social measures to reduce tensions between two or more parties. Buffer zones are an important tool in international relations, as they can help to prevent armed conflict and promote peaceful resolution of disputes.
This buffer zone is intended to prevent pollutants from entering the water body and protect it from potential environmental damage.
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How many moles of KBr are dissolved in 60.2 mL of a 3.50 M solution?
There are 0.2107 moles of KBr are dissolved in 60.2 mL of a 3.50 M solution.
The molarity of a substance is defined as the number of moles of solute present in 1 litre of a solution.
According to the given data, the molarity of the solution tells us that there are 3.50 moles of KBr in 1000mL of solution. But we only have 60.2mL of solution, so with a mathematical rule of three we can calculate the amount of moles in 60.2mL:
1000 ml - 3.50 moles
60.2 ml -x = 60.2 ml× 3.50 moles/1000 ml
x= 60.2 ml -0.2107 moles
So, there are 0.2107 moles of KBr.
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A vessel with a volume of 18.9 L contains 2.80 g of nitrogen gas, 0.807 g of hydrogen gas, and 79.9 g argon gas. At 25°C, what is the pressure in the vessel?
The pressure in the vessel is 3.76 atm.
To find the pressure in the vessel, we can use the ideal gas law, which states:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles of gas, R is the gas constant, and T is the temperature in Kelvin.
First, we need to calculate the total number of moles of gas in the vessel:
n(total) = n(N₂) + n(H₂) + n(Ar)
We can find the number of moles of each gas using the formula:
n = m/M
where m is the mass of the gas and M is the molar mass of the gas.
n(N₂) = 2.80 g / 28.01 g/mol = 0.0999 mol
n(H₂) = 0.807 g / 2.02 g/mol = 0.400 mol
n(Ar) = 79.9 g / 39.95 g/mol = 2.00 mol
n(total) = 0.0999 mol + 0.400 mol + 2.00 mol = 2.50 mol
Next, we can convert the temperature from Celsius to Kelvin:
T = 25°C + 273.15 = 298.15 K
Finally, we can plug in the values into the ideal gas law:
PV = nRT
P(18.9 L) = (2.50 mol)(0.08206 L·atm/mol·K)(298.15 K)
P = (2.50 mol)(0.08206 L·atm/mol·K)(298.15 K) / (18.9 L)
P = 3.76 atm
Therefore, the pressure in the vessel is 3.76 atm.
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Question
How do plants make their own food?
Drag and drop the words into the boxes to correctly complete the explanation.
The process of Response area allows plants to make their own food. In this process, plants capture the energy of Response area. They use the energy to combine Response area and water. The products include Response area, which is food for the plant. The other product is Response area, which the plant releases into the air.
The answers we got
sunlight
photosynthesis
oxygen
carbon dioxide
glucose
pls help its a master and i have a week or 2 left
Photosynthesis is the method by which plants produce their own food. Plants and other living things employ the process of photosynthesis to transform light into chemical energy that is then stored as starch that can be used at a later time. A vital step in plant growth is photosynthesis.
In your own words, describe how plants produce their own food ?.As autotrophs, plants produce their own sustenance. During the process of photosynthesis, they turn water, sunlight, and carbon dioxide into oxygen or simple sugars that the plant uses as fuel. These fundamental producers, which form the basis of an ecosystem, provide food for subsequent trophic levels.
Why is light essential for plants to produce food?Plants use the energy of a sun's light during the process of photosynthesis. Where the carbon dioxide and water are combined to create glucose, which the plants use as nourishment, using the trapped light energy to convert into chemical energy.
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Example Scenario:
Leah finished her lunch. All that is left is her plastic sandwich bag. Lea thinks there is no longer anything in the bag, but Paul disagrees. He thinks the bag is filled with air and air is something.
They decide to test their ideas by measuring and comparing the mass and volume of an empty flat and sealed plastic bag with one that has been inflated with air and sealed. Lea thinks that matter does not exist if it cannot be seen. Paul thinks matter can exist even when it's not visible.
Here is the data they collected:
The data collected by Leah and Paul supports Paul's opinion that matter can exist even when it is not visible.
What is support?Support is a term used to describe a range of services and resources offered to individuals in need. It can refer to providing help with practical tasks, such as helping someone to manage their finances or providing transport to medical appointments. It can also refer to providing emotional or social support. This could involve providing counselling or having regular conversations to help someone to feel understood and supported. Support can also refer to offering advice and guidance, or providing a safe space for someone to talk and express their feelings. In its broadest sense, support is about helping someone to have the best quality of life they can.
This is because the mass of the inflated bag is greater than the mass of the empty bag despite the fact that the volume of the inflated bag is much greater. This shows that the inflated bag contains air, which is matter, even though it cannot be seen.
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How many atoms are in 4.5 moles of neon?
How many miles are in 1.2x1023 atoms of silicon?
How many moles are in 3.4x1023 molecules of CH4?
How many moles are in 5.2x1024 atoms of gold?
How many atoms are in 26.2 moles of cobalt?
How many cookies are in 1.2 mole of cookies?
The atoms of neon are [tex]27.099 *10^{23}[/tex], moles of silicon are 0.1199 , moles of [tex]CH_{4}[/tex] are 0.56, moles of gold are 8.64, atoms of cobalt are [tex]157.7764*10^{23}[/tex] and number of cookies are [tex]7.2264*10^{23}[/tex].
How to calculate atoms?Multiplying the number of moles with [tex]6.022*10^{23}[/tex] we will get number of atoms of neon.
Number of atoms= [tex]4.5* 6.022 *10^{23}[/tex]
Number of atoms of neon = [tex]27.099 *10^{23}[/tex]
Moles of silicon?Number of atoms= moles * [tex]6.022*10^{23}[/tex]
Moles of silicon = [tex]\frac{1.2*10^{23}}{6.022*10^{23} }[/tex]
Moles of silicon = 0.199 moles
Moles of [tex]CH_{4}[/tex] ?Number of atoms= moles * [tex]6.022*10^{23}[/tex]
Moles of [tex]CH_{4}[/tex] = [tex]\frac{3.4*10^{23} }{6.022*10^{23} }[/tex]
Moles of [tex]CH_{4}[/tex]= 0.56 moles
Moles of gold?Number of atoms= moles * [tex]6.022*10^{23}[/tex]
Moles of gold = [tex]\frac{5.2*10^{24} }{6.022*10^{23} }[/tex]
Moles of gold= 8.64 moles
Number of atoms of cobalt?Number of atoms= moles * [tex]6.022*10^{23}[/tex]
Number of atoms of cobalt = [tex]26.2*6.022*10^{23}[/tex]
Number of atoms of cobalt = [tex]157.7764*10^{23}[/tex]
Number of cookies ?Number of atoms= moles * [tex]6.022*10^{23}[/tex]
Number of cookies= [tex]1.2*6.022*10^{23}[/tex]
Number of cookies= [tex]7.2264*10^{23}[/tex]
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When thermal energy is being removed from liquid, why does the temperature of the liquid at its freezing point remain constant until all the liquid freezes?
When thermal energy is being removed from a liquid and it starts to freeze, the temperature of the liquid will remains constant until all the liquid has frozen. This happens because the energy that is being removed is being used to break the bonds between the molecules in the liquid and to form a solid.
Once all the intermolecular bonds have been broken and the liquid has fully solidified, the temperature of the solid will continue to decrease with further cooling.
This process is known as latent heat of fusion, which is the amount of energy required to change a substance from a liquid to a solid state , without any change in temperature.
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A benzoic acid pellet weighing 6.54 g is placed in a bomb calorimeter along with 0.35 g fuse wire. The benzoic acid is ignited, and the temperature rise is 3.6°. What is the heat capacity of this calorimeter?
why is glucose a macromolecule?
Answer:
Sugar
Explanation:
Glucose is a carbohydrate. Carbohydrates are mainly used for quick energy inside cells, but they also play an important role in cell structure and communication. Carbohydrates are macromolecules called polysaccharides, meaning they are made of many sugars.
The students in the science class work together to model the sun, other stars, and Earth. The student who is modeling Earth stands in the center of the room. The students who model the stars each stand against the walls of the room. Each of these students holds a flashlight. The student who models the sun also holds a flashlight.
Where should the student who models the sun stand?
Answer:
The student who models the sun should stand somewhere in the room between Earth and the stars. The exact location will depend on how the students have chosen to set up the model and the relative distances they have assigned to each object. However, a common location for the sun model in this type of model is near one of the walls of the room, at a distance that is proportionally farther away from Earth than the stars. This is because the sun is much larger than any other object in our solar system and is located at the center of it, while the stars are much farther away. The student who models the sun should also be holding a flashlight, as the sun is a source of light and heat for our planet and the other planets in our solar system.
Answer: very close to Earth.
Explanation: I took the test the 2nd answer" to Question
The sun releases a huge amount of energy.
About what fraction of this energy reaches Earth? "
is :
one-billionth
How many moles of AgI will be formed when 75.0 mL of 0.300 M AgNO3 is completely reacted according to the balanced chemical reaction:
2AgNO₃(aq)+ Cal2(aq)-->2Agl(s)+Ca(NO3)2(aq))
The number of moles of AgI that will be formed when 75.0 mL of 0.300 M AgNO₃ is completely reacted is 0.0225 moles.
How to calculate number of moles?The number of moles of a substance can be calculated from a stoichiometric approach.
Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).
According to this question, the following reaction is given: 2AgNO₃(aq) + Cal2(aq)-->2Agl(s) + Ca(NO3)2(aq)
moles of AgNO₃ = 0.075 × 0.3 = 0.0225 moles
If 2 moles of AgNO₃ reacted to produce 2 moles of AgI, then 0.0225 moles of AgI will also be produced.
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Name the following compounds NH4CI
The compound NH4Cl or ammonium chloride is composed of two ions: ammonium ion (NH4+) and chloride ion (Cl-). The ammonium ion is a polyatomic cation made up of one nitrogen atom and four hydrogen atoms, while the chloride ion is a monatomic anion made up of one chlorine atom.
What is the mass of percent of 10 g solute in 105 g solvent?
The mass of the percent of the 10 g solute in the 105 g solvent is 8.69 %.
The mass of the solute = 10 g
The mass of the solvent = 105 g
The mass of the solution = 10 g + 105 g
The mass of the solution = 115 g
The mass of the percent is expressed as :
The mass of percent = ( mass of solute / mass of solution ) × 100 %
The mass of solute = 10 g
The mass of solution = 115 g
The mass of percent = ( 10 / 115 ) × 100 %
The mass of percent = 8.69 %
Thus, the mass of percent is 8.69 % and the mass of solute is 10 and the mass of the solution is 115 g.
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the acids show to the right cover a range of pH values Use what you know about acids bases and concentrations to label the test tubes in order from most acidic to most basic
Please note that the actual pH values and corresponding labels may vary depending on the specific pH range of the acids and bases you are using in your experiment.
What is pH?
pH is a measure of the acidity or basicity of a solution. It is a scale that ranges from 0 to 14, with 7 being considered neutral. A pH value less than 7 indicates acidity, with lower values indicating higher acidity. A pH value greater than 7 indicates basicity, with higher values indicating higher basicity.
pH is a measure of the concentration of hydrogen ions (H+) in a solution. A lower pH value indicates a higher concentration of H+ ions, which makes the solution more acidic.
It's important to measure and record the actual pH values of the solutions in the test tubes to accurately determine their acidity or basicity.
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The acids and bases shown right cover a range of pH values. Use
what you know about acids, bases, and concentration to label the
test tubes, in order, from most acidic to most basic.
Example Scenario:
Leah finished her lunch. All that is left is her plastic sandwich bag. Lea thinks there is no longer anything in the bag, but Paul disagrees. He thinks the bag is filled with air and air is something.
They decide to test their ideas by measuring and comparing the mass and volume of an empty flat and sealed plastic bag with one that has been inflated with air and sealed. Lea thinks that matter does not exist if it cannot be seen. Paul thinks matter can exist even when it's not visible.
Here is the data they collected:
Using the claims below:
a. Select the one that you feel is the most clear, concise and complete
b. Explain why
Claim A: According to the data, matter can exist even when it's not visible, the increased mass and volume of the inflated bag show this clearly.
Claim B: Matter can exist even when it's not visible.
Claim C: Yes
Claim D: Matter can exist when it is visible but may or may not when it is invisible.
The most clear, concise and complete Claim is Claim A.
Claim A: According to the data, matter can exist even when it's not visible, the increased mass and volume of the inflated bag show this clearly.
Is there something with mass that occupies space and is discernible as matter?Everything with mass and spatial requirements is considered matter. It contains all of the constituent parts of a substance, such as its molecules, atoms, and fundamental particles. Physical and chemical changes can cause matter to transform into different forms, but no matter what happens, matter is always conserved.
What attribute of matter is being illustrated when a balloon that is empty is filled with air and its mass increases?The air-filled balloon thus swells in size and expands, providing a superb illustration of Boyle's rule! When the balloon filled with water, the effects appear different. Even if you press down on the plunger to compress the air in the syringe, the water in the balloon is not compressed.
Claim B lacks a particular reference to the information gathered in the scenario and is a little too vague.
Claim C is deficient and offers no details or justification.
Claim D lacks a clear conclusion, is a little ambiguous, and does not make any mention of the particular information gathered in the scenario.
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Which of these is more likely to be a gas at room temperature?
NaCl
LiO₂
SO₂
Ca₃P₂
Which of these is more likely to be a gas at room temperature?
The correct answer is C. SO₂Further ExplanationSodium chloride (NaCl), lithium peroxide (LiO₂), and calcium phosphide (Ca₃P₂) are all ionic compounds that have high melting and boiling points due to the strong electrostatic forces of attraction between their ions. At room temperature, NaCl and LiO₂ are solids, and Ca₃P₂ is a grey metallic solid.
In contrast, SO₂ is a molecular compound that consists of molecules made up of one sulfur atom and two oxygen atoms. The electronegativity difference between sulfur and oxygen causes a polar covalent bond between them. SO₂ molecules are held together by weak intermolecular forces of attraction such as van der Waals forces. Thus, SO₂ exists as a gas at room temperature and atmospheric pressure.
What is a gas?- A gas is one of the four fundamental states of matter which is composed of molecules or atoms that are in constant random motion. Gas takes up a larger amount of space than solids or liquids because it has less intermolecular attraction between its particles.
Gases are usually compressible and can fill any container they occupy. The properties of a gas can be explained by the Kinetic Molecular Theory which describes that gas particles are in constant motion, collide with each other and with the walls of the container they are in, and that their motion is random and determined by temperature, pressure and volume.
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What is a temperature?- Temperature is a measure of the degree of hotness or coldness of an object or a substance relative to another. In physics, it is defined as the average kinetic energy of particles (such as atoms, molecules, or ions) in a system. The SI unit of temperature is Kelvin (K), but other common units of temperature include Celsius (°C) and Fahrenheit (°F).
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chemist prepares a solution of calcium sulfate (CaSO4) by measuring out 0.181 micro mol of calcium sulfate into a 100. mL volumetric flask and filling the flask to the mark with water.
Calculate the concentration in micro mol/L of the chemist's calcium sulfate solution. Be sure your answer has the correct number of significant digits.
Answer:
1.81 micromol/L.
Explanation:
The concentration of a solution is calculated by dividing the amount of solute by the volume of the solution. In this case, the amount of calcium sulfate is 0.181 micromol and the volume of the solution is 100 mL. So, the concentration of calcium sulfate in the solution is (0.181 micro mol) / (100 mL) = **1.81 micro mol/L
its e00 molew then asg hol
Select all answer choices that would result in units of moles.
a) RT/PV
b) PV/RT
c) mass ÷ molar mass
d) molar mass ÷ mass
e) molar mass × mass
f) molarity ÷ volume
g) volume ÷ molarity
h) molarity × volume
The correct options that will result in mole are option B, C, and H
How do i know which options will result in mole?To know the options that will result in mole, do the following:
Ideal gas law states as follow:
PV = nRT
Where
P is the pressure V is the volumen is the number of moleR is the gas constantT is the temperaturePV = nRT
Make n the subject by dividing both sides by RT
n = PV / RT (option B)
Mole, mass and molar mass are related according to the following formula:
Mole = mass / molar mass (option C)
Molarity is defined as mole per unit volume as shown below:
Molarity = mole / volume
Make mole the subject by cross multiplying.
Mole = Molarity × volume (option H)
Thus, from the above illustrations, we can conclude that the correct options which will result in mole are option B, C, and H
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Which of the following reactions is associated with the lattice energy of MgSe (ΔH°latt)?
Mg(s) + Se(s) → MgS(s)
Mg2⁺(g) + Se2⁻(g) → MgSe(s)
Mg2⁺(aq) + Se2⁻(aq) → MgSe(s)
MgS(s) → Mg(s) + Se(s)
MgSe(s) → Mg2⁺(aq) + Se2⁻(aq)
Answer: Mg2⁺(g) + Se2⁻(g) → MgSe(s)
Explanation: This response includes the arrangement of one mole of MgSe(s) from its constituent vaporous particles, and the discharge of cross section vitality. The other responses recorded don't include the arrangement of MgSe from its constituent particles within the gas stage, so they are not related with the grid vitality of MgSe.
What would be the bond type (covalent, polar covalent, ionic) for both B-H bonds in BH2? Explain in a short sentence.
Answer: non-polar covalent
Explanation:
If two atoms have an electronegativity difference of 0.4 or less, they form a non-polar covalent bond.
B is 2.04 electronegativity
H is 2.20 electronegativity
the electronegativity difference is 0.16.
this is less than 0.4 so the bonds are non-polar covalent.
informartion on rhenium oxide in 100 words
Rhenium oxide is a chemical compound composed of rhenium and oxygen atoms. Its chemical formula is ReO3, and it is a black or dark gray solid with a crystalline structure. Rhenium oxide is a highly refractory material with a very high melting point and excellent thermal stability, which makes it useful in high-temperature applications such as furnace linings and electrical contacts. It is also used as a catalyst in various chemical reactions, including the production of synthetic ammonia and in the dehydrogenation of alcohols. Rhenium oxide is a relatively rare material and is generally produced as a byproduct of other mining and refining processes. It has a number of unique properties that make it valuable in a variety of industrial and scientific applications.