Chemical containers must be sealed properly when they are stored after the experiments ends so that the chemicals do not react with atmospheric gases.
It is advisable to use laboratory grade refrigerators and freezers to store sealed chemical containers containing flammable liquids that requires a cool storage.
Chemicals that are hazardous must be stored below eye level and should not be kept on the floor or window edges.
Chemicals must be stored in containers that are made up of materials that do not react with the composition of the chemical stored in that particular container. Strong acids and bases should be stored separately.
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when is the best time to clean glassware during the lab session?
Wash glassware in hot water or a glassware washer as soon as you're finished using it to avoid the formation of hard-to-remove residue. Corning recommends soaking glassware in water if it's impossible to wash it immediately after use
Any glass laboratory equipment is referred to as glassware. When you're through using a glass item, wipe it down to get rid of any cleaning agent.
Glass makes up a large portion of our scientific equipment, including measuring cylinders, conical flasks, and beakers. After use, these glasses need to be professionally cleaned.
Since they are frequently cleaned with a solvent, small particles of the cleaning agent stick to the glassware.
In order to avoid contaminating a sample placed in glassware, these cleaning solvent particles must be removed with a wipe.
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what volume of a 0.200 m solution of kbr is needed to precipitate 16.0 g of agbr from a solution containing 0.420 mol of agno3 .
To precipitate 16.0 g of AgBr from a solution containing 0.420 mol of Ag, 0.143 L of a solution containing 0.200 M KBr is required.
What's volume?"The amount of space an object or substance occupies" is the definition of volume, which is a scalar quantity. It is a measurement of an object's or substance's three-dimensional extent and is typically expressed in length-cubed units like cubic meters (m3), liters (L), or cubic centimeters (cm3).
The idea of stoichiometry can be used to figure out how much of a 0.200 M KBr solution is required to precipitate 16.0 g of AgBr from a solution containing 0.420 mol of AgNO3.AgNO3 + KBr = AgBr + KNO3
According to the balanced equation above, the reaction between AgNO3 and KBr is a one-to-one reaction, which indicates that the precipitated moles of AgNO3 are the same as the moles of AgBr.The amount of AgBr precipitated is also 0.420 mol, as the molecular weight of AgNO3 is 0.420 mol.Multiplying the number of moles by the molar mass of AgBr yields the precipitated mass of AgBr:Since AgBr has a mass of 16.0 g, the volume of KBr required is calculated by dividing the mass by the molarity and the number of moles in the solution:mass = moles x molar mass
= 0.420 mol x 247.8 g/mol
= 104 g
V = m / M x n
= 16 / (0.200 x 0.420)
= 0.143 L.
As a result, in order to precipitate 16.0 g of AgBr from a solution containing 0.420 mol of Ag, 0.143 L of a solution containing 0.200 M KBr is required.Learn more about volume:
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consider the following gas-liquid equilibrium for an aqueous system at a constant partial pressure of n2. n2(g) n2(aq) what is the effect on the equilibrium composition of the liquid when the temperature of the liquid is increased?
On increasing the temperature, the equilibrium will shift towards the left as when we increase the temperature, the solubility of gases in the liquid decreases.
The solubility of gases depends on the temperature. When we increase the temperature of a liquid, the solubility of gases decreases. This happens because the kinetic energy of the molecules increase and the gas escapes the liquid.
N₂ (gas) ⇄ N₂ (aq)
According to the above equation, the nitrogen gas is in equilibrium with the liquid nitrogen. The equilibrium will shift to the left as the solubility will decrease and N₂ will escape from the liquid on increasing then temperature.
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If you were to perform this reaction and actually produced 10.86 g of H2O, what would be your percent yield? (Your theoretical/expected yield is the amount produced from your limiting reactant.)
42.22 %
55.43 %
99.99 %
32.86 %
Other:
If the reaction were performed and actually produced 10.86 g of H₂O, the percent yield would be 52.54%.
What is the percent yield of a reaction?The percent yield of a reaction is the ratio of the actual yield of a reaction and the theoretical or expected yield of a reaction as obtained from the equation of the reaction expressed as a percentage.
Mathematically:
Percent yield = actual yield / theoretical yield * 100%The theoretical yield of the reaction from the equation of the reaction given below is 20.67 g
Equation of reaction:
Ca(OH)₂ ---> CaO + H₂O
Percent yield = 10.86/20.67 * 100%
Percent yield = 52.54%
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Complete question:
If 85.0 grams of Ca(OH)2 are used in this reaction, how many grams of water would be produced?
If you were to perform this reaction and actually produced 10.86 g of H2O, what would be your percent yield? (Your theoretical/expected yield is the amount produced from your limiting reactant.)
what physical property below would have made a mineral appropriate for use as an old-time window covering before glass was widely available?
being able to be divided into big, thin layers FEEDBACK: A mineral must be divided into numerous, thick layers in order to be utilized as a window pane. supple, fragile layers
What constitutes a mineral?A mineral is an organic element or compound that occurs in nature and has a recognizable chemical composition, crystalline size, and physical characteristics. Silica, feldspar, mica, albite, olivine, and calcite are examples of common minerals.
A mineral is it a rock?A mineral is just a substance that occurs naturally having unique atomic structures, compositions, and chemical and physical properties. Rocks are often composed of two or even more minerals that have been mixed by geological processes.
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which of the following forces stabilize protein 3-dimensional structure? choice 1 of 6:ionic interactions choice 2 of 6:h-bonding choice 3 of 6:van der waals forces choice 4 of 6:metal ions choice 5 of 6:disulfide bonds choice 6 of 6:all of the above
All of the above forces (ionic interactions, H-bonding, van der Waals forces, metal ions, and disulfide bonds) play a role in stabilizing the 3-dimensional structure of proteins. Thus, the correct answer is Choice 6 of 6: all of the above.
Ionic interactions occur between positively and negatively charged amino acid residues, which helps to maintain the overall charge balance of the protein. H-bonding involves the sharing of electrons between atoms, and helps to hold the protein's secondary and tertiary structures in place. Van der Waals forces are relatively weak interactions between atoms, but they can contribute to the stability of the protein by helping to hold the atoms in place. Metal ions can also play a role in stabilizing the protein by binding to specific amino acid residues. Disulfide bonds form between cysteine residues and help to hold the protein's tertiary structure in place.
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Metal- Magnesium
Appearance of metal- ?
Reactant - cold water
Observation of reaction- ?
Cold water has a very modest interaction with very clean magnesium ribbon. Hydrogen bubbles start to appear on its surface after a while.
What happens when reactive metals react with cold water?Hydroxides are created when metals and cold water react. Oxides are produced when metals react with steam.Magnesium and oxygen interact to create light that is so intense that it temporarily renders you blind. Because so much heat is released during the reaction, magnesium burns so brightly. Magnesium provides two electrons to oxygen during this exothermic process, resulting in the formation of powdered magnesium oxide (MgO).When magnesium combines with water vapour, it can also produce hydrogen gas and magnesium hydroxide. Magnesium hydroxide and hydrogen are created when magnesium combines with hot water.what occurs if a heated piece of metal is dropped into room temperature water. The water will heat up while the metal cools over time. Both items' temperatures will eventually be equal.To learn more about bubbles refer to:
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The Kool-Aid company has hired you to modify the Kool-Aid solution to meet the needs of people with high diabetes. The original solution contains: 3 packs of Kool-Aid (6 g per pack), 1 gallon of water (3. 87 L of water). As a scientist, how would you modify the original Kool-Aid solution to better meet the needs of people with high diabetes. In your response, be sure to include all calculations and content specific vocabulary
As a scientist, I would recommend modifying the original Kool-Aid solution by reducing the amount of added sugar in the mix. The current recipe calls for 3 packs of Kool-Aid, each contains 6 grams of sugar.
To reduce the sugar content, we could reduce the number of packs of Kool-Aid used in the recipe or use a sugar-free or reduced-sugar version of the product. For example, if we used 1 pack of sugar-free Kool-Aid, the sugar content would be reduced to 0 grams. Or, if we used 2 packs of regular Kool-Aid, the sugar content would be reduced to 12 grams. Another option to consider would be to use a sugar substitute like Stevia or Erythritol which are low-calorie sweeteners and are safe for diabetics. It's also important to note that, as a scientist, it would be important to conduct taste tests with diabetic individuals to ensure that the modified recipe is still palatable and acceptable.
In summary, reducing the amount of sugar in the Kool-Aid mix or using a sugar substitute would be a way to modify the original Kool-Aid solution to better meet the needs of people with high diabetes.
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A sheet of lead is 2.0 cm thick. What is the mass of the sheet of lead if it measures 1.0 m by 1.0 m and has a density of 1.42 g/mL
Answer:
Below
Explanation:
1 meter = 100 cm
Volume = 100 cm * 100 cm * 2 cm = 20 000 cm^3 = 20 000 ml
mass = volume * density
= 20 000 ml * 1.42 g/ ml = 28400 g ( or 28.4 kg)
Scientists study how radioactive isotopes in rocks, such as Carbon-14, decay to
tell the age of the rock.
Explain how knowing the half-life of Carbon 14 can tell scientists the absolute
age of a rock sample.
By counting how many 1/2 lifts it has experienced, we or Scientists may determine its exact age. For each 12 lives in the case of carbon, it takes 5730 years.
What is the radioactive isotope?Carbon-14 is a radioactive isotope that is commonly used to determine the age of organic materials, such as wood, bones, and shells. It is formed in the upper atmosphere when cosmic rays interact with nitrogen atoms, and it is incorporated into living organisms through photosynthesis or ingestion. Once an organism dies, it stops taking in Carbon-14, and the isotope begins to decay at a steady rate.
The half-life of Carbon-14 is the amount of time it takes for half of the original amount of the isotope to decay. For Carbon-14, the half-life is about 5,730 years. This means that after 5,730 years, half of the Carbon-14 atoms in a sample will have decayed into Nitrogen-14.
So, Scientists can use the half-life of Carbon-14 to determine the absolute age of a rock sample by measuring the ratio of Carbon-14 to Carbon-12 in the sample. By comparing this ratio to the known decay rate of Carbon-14, scientists can calculate the amount of time that has passed since the organism died, and therefore the age of the rock sample.
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A student in your class has decided to dissolve epsom salts in water and observe the crystals that are left behind after the water evaporates. They have selected this reaction for their culminating event project. What advice would you give this student. Is this an example of a chemical change and reaction? Use evidence and scientific reasoning to support your claim
The action of dissolving Epsom salts (magnesium sulfate) in water and observing the crystals that are left behind after the water evaporates is a physical change, not a chemical change.
A chemical change is a process that leads to the formation of new substances, whereas a physical change is a process that alters the form of a substance without creating new substances. In this case, the Epsom salts are not forming new substances when it dissolves in water, it is simply change its state from a solid to a solution. And when the water evaporates, the Epsom salts will change back to their original solid form. Evidence to support this claim can be found in the fact that the chemical composition of the Epsom salts remains the same before and after the dissolution process. Magnesium sulfate has the same chemical formula (MgSO4) before and after being dissolved in water, and also before and after the water evaporates. The chemical composition is unchanged and the substance is still magnesium sulfate.
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I NEED HELP ASAP
What is the frequency associated radiation of these wavelengths?
a) 8.0x10^-3 cm
b) 12.0 micrometers
c) 2.80x10^-10 m
d) 300 nm
Answer:
a
Explanation:
I don't know two jsjsjsjahajaja
which bonds occur between two atoms in each of which the number of protons does not equal the number of electrons? select all that apply.
The bonds occur between two atoms in each of the which the number of the protons not equals to the number of electrons is the 1) ionic bond.
An atom which do not have the number of the protons is equals to the number of the electrons is called as the ion. The ion may be positive or negative charge.
The ionic bond is formed between the negatively charged atom and the positively charged atom. The compound formed between the atoms by the complete transfer of electrons called as the ionic compounds and the bond is called as the ionic bond.
The given question is incomplete, the complete question is :
which bonds occur between two atoms in each of which the number of protons does not equal the number of electrons? select all that apply.
1) Ionic bond
2) covalent bond
3) coordinate bond
4) none of the above
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How are coniferous trees different from deciduous trees? (Select all that apply.) BRAINLY
Coniferous trees differ from deciduous trees in that they produce cones as a mechanism of reproduction and have waxy, needle-shaped leaves to retain water. B and D are the appropriate choices as a result.
Describe deciduous trees.The blossoms on deciduous trees are big.
They are all over the planet, including oaks, maples, and beech trees.
Deciduous refers to something that falls off, and these trees lose their leaves every fall.
Deciduous trees typically have large, flat leaves.
Coniferous trees: what are they?Coniferous trees have tiny, waxy leaves that are often thin (needles or flat scales) and designed to hold onto water.
A tree that produces cones is referred to as a conifer. The most prevalent conifers are spruces, pines, and firs.
Evergreens and softwoods are other names for coniferous trees.
Broad leaves on deciduous trees turn color in the fall, and they use flowers to spread their seeds.
Coniferous trees don't change color in the fall, have needles instead of leaves, and use cones to disseminate their seeds rather than flowers.
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Complete Question -
2. How are coniferous trees different from deciduous trees? (Select all that apply.)
Conifers grow berries as a means of reproducing.
Conifers grow cones as a means of reproducing.
Conifers drop their leaves in colder seasons to conserve water.
Conifers have waxy, needle-shaped leaves to retain water.
10.000 g of boron (b) combines with hydrogen to form 11.554 g of a pure compound. what is the empirical formula of this compound?
The empirical formula of the compound is B₃H₅
According to the law of conservation of mass, "matter in a closed system is neither created nor destroyed by physical transformations or chemical reactions but changes from one form to the other"
This implies that, sum of masses of the reactants = sum of masses of the product
Therefore, according to the question:
10g of Boron + x grams of Hydrogen = 11.55g of the product
∴ Mass of hydrogen = 11.55 - 10.00 = 1.55g
We know that,
Molar mass of Boron = 10.811g
Molar mass of Hydrogen = 1.00784g
Number of moles of Boron
= (mass of Boron)/(molar mass of Boron)
= 10/10.811
= 0.9249 mol
Number of moles of Hydrogen
= (mass of Hydrogen)/(molar mass of Hydrogen)
= 1.55/1.00784
=1.5379mols
Thus, 0.9249 mole of Boron will combine with 1.5379mole of Hydrogen
Now, by dividing both sides of the mole by 0.9249, we get
1 mole of Boron combines with 1.66266 mole of Hydrogen
converting 1.66266 in fractions is approximately 5/3
which implies, 1 mole of Boron combines with 5/3 moles of Hydrogen
Now, by multiplying both sides by 3 we get
3 moles of Boron will combine with 5 moles of Hydrogen
∴ Empirical formula of the compound is B₃H₅
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To determine the melting point of ice, which procedure would best help measure the melting point temperature?
A - Mix ice with water until just before equilibrium is reached but some ice remains that is still melting.
B - Mix ice with water until equilibrium is reached but some ice remains that is still melting.
C - Mix ice with water until equilibrium is reached but some ice remains that is no longer melting.
D - Mix ice with water until just before equilibrium is reached but some ice remains that is no longer melting.
Answer:
Explanation:
C - Mix ice with water until equilibrium is reached but some ice remains that is no longer melting.
9. water draining from an abandoned coal mine is likely to have a. excess of hydrogen ions and a high ph c. excess hydrogen ions and a low ph b. excess hydroxide ions and a low ph d. excess of hydroxide ions and a high ph
The solution is excess hydrogen ions and a low ph.
It probably has a low pH and too many hydrogen ions. Acid mine drainage (AMD), which lowers the pH of water resources and makes dissolved metals easily available for uptake by benthic animals and fish, is a significant contributor to the entry of these contaminants into the human food chain. The term "acid mine drainage" refers to the runoff that results from water coming into touch with exposed sulfur-bearing minerals. These minerals react with the water and air to produce sulfuric acid and dissolved iron. Heavy metals like copper, lead, and mercury are dissolved by this acidic runoff, contaminating both groundwater and surface water. Mine drainage issues include tainted drinking water, hampered aquatic plant and animal development and reproduction, and the acid's corrosive effects on parts.
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The vapor pressure of water at 45. 0 °C is 71. 93 torr. Calculate the vapor pressure of a solution of 1. 48 m Al(NO3)3 at this temperature (assume 100% dissociation)
The vapor pressure of the solution of 1.48 m Al(NO₃)₃ at 45.0 °C is 71.93 torr.
This can be calculated using Raoult's law. The law states that the vapor pressure of a solution is inversely proportional to the mole fraction of the solvent (not the solute).
The following formula can be used to get the vapor pressure of a solution of 1.48 m Al(NO₃)₃ at 45.0 °C:
P = P° × Xsolvent
where P is the vapor pressure of the solution, Xsolvent is the solvent's molecular weight, and P° is the solvent's pure vapor pressure.
The solvent's mole fraction is equal to 1 because it is presumed that the solute has entirely broken down. In this instance, the solution's vapor pressure is the same as the pure solvent's, which is 71.93 torr at 45.0 °C.
Hence, the vapor pressure of the solution of 1.48 m Al(NO₃)₃ at 45.0 °C is 71.93 torr.
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molybdenum can form a wide series of halide compounds, including four different fluoride compounds. the percent by mass of molybdenum in the four compounds is 63.0%, 63.0 %, 56.0%, 56.0 %, 50.0%, 50.0 %, and 46.0%. 46.0 %. determine the formula and name for each of the four different molybdenum fluorides.
The formula and the name for each of the four different molybdenum fluorides are :
1) Formula of the compound = MoF₃ = Molybdenum trifluoride
2. Formula of the compound = MoF₄ = Molybdenum tetrafluoride
3. Formula of the compound = MoF₅ = Molybdenum pentafluoride
4. Formula of the compound = MoF₆ = Molybdenum hexafluoride
1) Molybdenum (Mo) = 63.0%
Fluorine (F) = 100 – 63 = 37%
Moles, Mo = 63.0 / 96 = 0.656
Moles, F = 37 / 19 = 1.947
Divide by the smallest
Mo = 0.656 / 0.656 = 1
F = 1.947 / 0.656 = 3
The formula is MoF₃ = Molybdenum trifluoride
2) Molybdenum (Mo) = 56.0%,
Fluorine (F) = 100 – 56 = 44%
Moles are :
Mo = 56 / 96 = 0.583
F = 44 / 19 = 2.316
Divide by the smallest
Mo = 0.583 / 0.583 = 1
F = 2.316 / 0.583 = 4
The compound is MoF₄ = Molybdenum tetrafluoride
3) Molybdenum (Mo) = 50.0%,
Fluorine (F) = 100 – 50 = 50%
F = 50%
Mo = 50 / 96 = 0.520
F = 50 / 19 = 2.632
Divide by the smallest
Mo = 0.520 / 0.520 = 1
F = 2.632 / 0.520 = 5
The compound is MoF₅ = Molybdenum pentafluoride
4) Mo = 46%
F = 54%
Mo = 46 / 96 = 0.479
F = 54 / 19 = 2.842
Divide by the smallest
Mo = 0.479 / 0.479 = 1
F = 2.842 / 0.479 = 6
Formula of compound = MoF₆ = Molybdenum hexafluoride.
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for a gas at a fixed pressure and temperature, what will happen to the volume of the gas when the number of moles of gas is doubled?
For a gas at a fixed pressure and temperature, when the number of moles of gas is doubled, the volume of the gas will also double.
At a fixed pressure and temperature, the volume of a gas is directly proportional to the number of moles of gas present. This relationship is described by the Ideal Gas Law, PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature.
If the number of moles of gas is doubled, the volume of the gas will also double. This is because the pressure and temperature are fixed, and according to the Ideal Gas Law, the only variable that affects the volume of the gas is the number of moles present. The volume of the gas will increase proportionally with the number of moles, so if the number of moles is doubled, the volume will also double. This is only valid for ideal gases; for real gases, this relationship is not strictly observed.
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Make a simple abstract design using shape tools and color palette on MS paint. Give it an interesting title using paint tool
To make an abstract design, use the MS Paint tool. To build the design, you may utilize form tools such as circles, squares, and triangles. You may also utilize the color pallet to add color to the shapes.
You may also use the paint brush to draw patterns or lines. You may use the text tool to add text to the design for the title. You may select a typeface and color that compliments the overall design. For example, you might call it "Chaotic Harmony" or "Colorful Illusion" to convey the abstract design. You may use the text tool to add text to the design for an intriguing title. You may select a typeface and color that compliments the overall design. a simple abstract design using shape tools and color palette on MS paint. Give it an interesting title using paint tool. You may use the text tool to add text to the design for an intriguing title. You may select a typeface and color that compliments the overall design.
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Suppose you are given a Stock Solution of 15.406 M hydrochloric acid. What volume of water must you add have ready to add your acid to (in mL) to prepare a solution with a hydrochloric acid molar concentration of 3.361 M and a volume of 372.510 mL? NOTE: When typing your answer below, round your answer to 3 decimal places. Show you work for part marks. Do not forget to upload your steps. Keep units according to the givens in the question.
M1V1 = M2V2
where M1 and V1 are the molar concentration and volume of the stock solution, and M2 and V2 are the molar concentration and volume of the final solution. We can use this formula to find the volume of water that we need to add to the stock solution to prepare the final solution.
Plugging in the given values, we have:
15.406 M x V1 = 3.361 M x 372.510 mL
To solve for V1, we can divide both sides of the equation by 15.406 M:
V1 = 3.361 M x 372.510 mL / 15.406 M
V1 = 24.227 mL
Therefore, we need to add 24.227 mL of water to the stock solution of 15.406 M hydrochloric acid to prepare a solution with a hydrochloric acid molar concentration of 3.361 M and a volume of 372.510 mL.
a beaker contains 145.675 ml of a saline solution. if 24.2 ml of the saline solution are removed from the beaker, what volume of solution remains?
a beaker contains 145.675 ml of a saline solution. if 24.2 ml of the saline solution are removed from the beaker, The volume of solution remains is 121.5 ml.
Water and sodium chloride are combined to make saline. It can be used in medicine for a variety of purposes, such as cleaning wounds, removing and storing contact lenses, and treating dry eyes. As the saline solution is liquid. and no other solvents is added.The value of the solution remaining in the beaker can be calculate by simply substrating removed solution value from initial value
volume withdrawn from the flask substrate by total volume
= 145.675 ml - 24. 2 ml
= 121.475 ml
= 121.5 ml
So, the solution in the beaker is 121.5 ml
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The volume of the solution remained in the beaker after removing 24.2 ml of the saline solution is 121.5 ml.
A Saline solution is said to be a mixture of sodium chloride and water. This solution has a number of uses in medicine including cleaning wounds, removal and storage of contact lenses and help with dry eyes. It is used to treat dehydration by injecting the solution through vein.
A beaker contains 145.675 ml of a saline solution. if 24.2 ml of the saline solution are removed from the beaker. To find the remaining solution in the beaker we have to substract the total solution that was present in the beaker with the amount of the solution that is removed from the beaker.
Remaining volume of the solution = 145.675 ml - 24.2 ml
= 121.5 ml
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Given that AG for the reaction below is -957.9 kJ, what is AG, of H₂O?
AGI,NH3-16.66 kJ/mol
AGINO 86.71 kJ/mol
= =
O-228.6 kJ/mol
O-206.4 kJ/mol
O 46.7 kJ/mol
O 90.7 kJ/mol
4NH3(g) +50₂(g) → 4NO(g) + 6H₂O(g)
The free energy of the water is obtained as 90.7 kJ/mol. Option D
What is the Hess law?We have to note that the Hess law of the constant heat summation is the law that we can be able to use in this case so as to be able to obtain the standard free energy of the formation of the water.
We have to keep in mind that the standard free energy of the reaction can be obtained by;
Standard free energy of reaction = Standard free energy of product - Standard free energy of the reactants
Thus;
Let the standard free energy of water be X
-957.9 = [4( 86.71 ) + 6X] - [4(-16.66) + 5(0)]
957.9 = (346.84 + 6X) - (-66.64)
957.9 = 280.2 + 6X
X = 90.7 kJ/mol
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An increase in the biodiversity of an ecosystem leads to an increase in its productivity.
The increase in the diversity of species in an ecosystem definitely lead to an increase in the productivity from that ecosystem. Hence, the statement is true.
What is an ecosystem?An ecosystem is the regions in earth where a group of living things and their essential non living things reside. There are various kind of ecosystems such as aquatic systems, forests, deserts etc.
The biodiversity refers to the diverse species of plants , animals and all other kind of livings there. By raising the possibility that species would use complementary resources and by increasing the likelihood that a highly productive or efficient species is present in the population, increasing species diversity can impact ecosystem functions, such as production.
For instance, greater use of soil resources can boost ecosystem production when there is a large diversity of plants. Similarly, when diverse plants populate more dependent animal variants survives more.
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Answer:
A. True
Explanation:
Got it right on Edge 2023.
to the best of your knowledge, classify each of the following as an element, compound, or mixture. explain how your everyday experiences influenced your response. a. silver coin b. air c. coffee d. soil
a. Silver coin - Element (Silver is a pure element and is not chemically combined with any other element in a silver coin)
b. Air - Mixture (Air is a mixture of gases, primarily nitrogen and oxygen, with trace amounts of other gases and particles)
c. Coffee - Mixture (Coffee is a mixture of various compounds such as water, caffeine, and organic compounds that give it its flavour and aroma)
d. Soil - Mixture (Soil is a mixture of various substances such as minerals, organic matter, water, and air)
My everyday experiences influenced my response because I have come across these examples in my daily life and have been taught about them in science classes. For example, I know that air is composed of different gases and particles, and that soil is made up of a mixture of substances, including minerals and organic matter. Similarly, I know that a silver coin is made of pure silver and that coffee is made of various compounds.
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If 85.0 grams of Ca(OH)2 are used in this reaction, how many grams of water would be produced?
41.35 g
38.2 g
12.86 g
42.5 g
If 85.0 grams of Ca(OH)₂ are used in the reaction, the mass in grams of water would be produced is 20.67 g.
The correct option is not given.
How many grams of water would be produced?The mass of water produced is determined as follows:
Equation of reaction:
Ca(OH)₂ ---> CaO + H₂O
The mole ratio of the reaction shows that 1 mole of Ca(OH)₂ decomposes to yield 1 mole of CaO and 1 mole of H₂O.
Molar mass of Ca(OH)₂ = 74 g
Molar mass of H₂O = 18 g
74 g of Ca(OH)₂ decomposes to produce 18 g H₂O.
The mass of water produced from 85.0 grams of Ca(OH)₂ = 85 * 18/74
The mass of water produced from 85.0 grams of Ca(OH)₂ = 20.67 g
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10. Suppose you have a sample of potassium. Describe several ways you could use
periodic trends and a
knowledge of valence electrons to predict the element's
reactivity and how the element will behave in a chemical bond.
Periodic patterns and knowledge of valence electrons can be used to forecast an element's reactivity and behavior in a chemical bond in a variety of ways: Electronegativity.
An element's electronegativity reflects its capacity to attract electrons in a bond. High electronegativities elements, such as fluorine, are more reactive and form stronger bonds than low electronegativities elements, such as sodium. Ionization Energy: One element's ionization energy defines the amount of energy necessary to remove an electron from the element. High ionization energies elements, such as calcium, are less reactive and less prone to form covalent connections. Valence electrons: An element's reactivity is determined by the number of valence electrons it has. Elements with a small number of valence electrons.
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