Besides its use in making black-and-white film, silver nitrate (AgNO₃) is used similarly in forensic science. The NaCl left behind in the sweat of a fingerprint is treated with AgNO₃ solution to form AgCl. This precipitate is developed to show the blackand- white fingerprint pattern. Given that ΔH lattice = 822 kJ/mol and ΔH hydr = - 799 kJ/mol for AgNO₃, calculate its ΔH soln.
Answers
The precipitate is developed to show the blackand- white fingerprint pattern, ΔH soln is 23kJ/mol
Given,
ΔH lattice = 822 kJ/mol
ΔH hydr = - 799 kJ/mol for AgNO₃
ΔH soln = ΔH lattice + ΔH hydr = 822-799 = 23kJ/mol
PrecipitatePrecipitation in an aqueous solution is the process of changing a dissolved component from a super-saturated solution into an insoluble solid. Precipitate refers to the solid that forms. The chemical agent responsible for the formation of the solid during an inorganic chemical reaction is known as the precipitant.
Supernate or supernatant are other names for the clear liquid that remains above the precipitated or centrifuged solid phase. When solid impurities separate from a solid phase, the concept of precipitation can be applied to various areas of chemistry as well as the solid phases themselves. When a compound's concentration is higher than its solubility, precipitation could happen. Changes in temperature, solvent evaporation, or solvent mixing may be to blame for this.
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Related Questions
How many milliliters of a stock solution of 6.20 M HNO3 would you have to use to prepare 0.130 L of 0.470 M HNO3?
Answers
Answer:
9.85
Explanation:
M1V1 =M2V2
6.20×v1= 0.470×0.130
v1 = ( 0.470 × 0.130 ) ÷ 6.20
v1 = 0.0098 L × 1000
V1 = 9.8 ml
Diffusion of water across the cell membrane is called ____
a. Diffusion
b. Osmosis
c. Concentration
Answers
Answer:
B Osmosis
Explanation:
Why is the balance between water and lipid solubility of a drug important?
Answers
The balance between water and lipid solubility of a drug is crucial for its pharmacokinetics, which refers to how the drug is absorbed, distributed, metabolized, and excreted in the body.
Importance of Water and Lipid Solubility1. Absorption: The ability of a drug to be absorbed across biological membranes, such as the gastrointestinal tract or cell membranes, depends on its solubility. Lipid-soluble drugs can easily penetrate cell membranes, including those in the gastrointestinal tract, which facilitates their absorption. On the other hand, water-soluble drugs may require specific transport mechanisms or channels to cross cell membranes and be absorbed effectively.
2. Distribution: Once absorbed, drugs need to be distributed throughout the body to reach their target sites. Lipid-soluble drugs have better permeability across cell membranes and can readily enter tissues and cross biological barriers, including the blood-brain barrier, whereas water-soluble drugs may have limited distribution due to their inability to pass lipid-rich barriers.
3. Metabolism: Enzymes involved in drug metabolism, such as those in the liver, often act on drug molecules that have entered cells. Lipid-soluble drugs can easily diffuse into cells, making them more accessible to metabolizing enzymes. In contrast, water-soluble drugs may have a slower or more limited metabolism since they may rely on transporters to enter cells.
4. Excretion: Drugs and their metabolites need to be eliminated from the body to prevent drug accumulation and maintain therapeutic levels. Lipid-soluble drugs tend to be reabsorbed in the kidneys and excreted more slowly, whereas water-soluble drugs are readily eliminated through urine due to their water solubility.
5. Pharmacological activity: The target site of a drug may vary, such as receptors located on cell membranes or within cells. Depending on the drug's target, its solubility properties can affect its ability to reach and interact with the target effectively. Lipid-soluble drugs may have better access to intracellular targets, while water-soluble drugs may interact predominantly with extracellular targets.
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Krypton has an atomic number of 36 and a mass number of 84. Which statement describes a neutral
atom of krypton? (1 point)
O
It has the same number of protons as neutrons, but it has a greater number of
electrons.
It has the same number of protons as electrons, but it has a lesser number of
neutrons.
It has the same number of protons as electrons, but it has a greater number of
neutrons.
O
It has the same number of protons as neutrons, but it has a lesser number of
electrons.
Answers
Answer:
It has the same number of protons as electrons, but it has a greater number of
neutrons.
Explanation:
Atomic mass= number of proton + no. of neutron
If the number of proton is 36 and mass is 84, let's find it;
Atomic mass= number of proton + no. of neutron
84=36+no. of neutron
84-36= no. of neutron
48= no. of neutron
we can see, that no. of neutron is greater than no. of proton
Are two atoms of the same element identical??
Answers
GIVING AWAY 70 PTS AND BRAINLIEST ANSWER QUICK!
Which of the following techniques can be used to separate a heterogeneous mixture into its component parts? A Sort by colour B Separation by density C Apply heat D Apply pressure
Answers
Answer:
i think it might be separation by density
Explanation:
Answer:
B: Sort by density
Btw im not copying the person above me. I am 98% Sure its density
A topographic map with 4 regions labeled. Region 1 is an area with no contour lines near the railroad. Region 2 is an area with few contour lines. Region 3 is an area with several contour lines close together with index contour line labeled 450. Region 4 is an area with few contour lines.
Which area is the flattest?
1
2
3
4
Answers
Answer:
Region one because an area that has contour lines close together means that the area is steep. but in region ones case it has no contour lines meaning the area is flat.
Answer:
A. 1
Explanation:
Larissa is making sautéed purple cabbage. First, she washes and cuts the cabbage into long thin strands. Then, she puts a
pan on the stove and adds butter. She allows the butter to melt and turn to liquid. Next, she adds the cabbage to the butter
sprinkles some salt on it, and stirs it. Larissa watches as the cabbage sizzles, releases steam, and softens. To finish the side
dish, she adds a squeeze of lemon juice to it, which causes it to change from purple to pink. Finally, Larissa empties the
cabbage into a bowl and puts it on the dinner table.
Which of the events involves a chemical reaction?
O Larissa adds butter to a pan and allows it to melt and turn to liquid.
O Larissa adds a squeeze of lemon juice to the cabbage, and it turns pink.
O Larissa watches as the cabbage sizzles, releases steam, and softens.
O Larissa washes and cuts some purple cabbage into long thin strands.
O Larissa empties the cabbage into a bowl and puts it on the dinner table.
O Larissa adds the cabbage to the butter with a sprinkle of salt and stirs it.
Answers
Answer:
When she adds lemon juice
Explanation:
I believe that it is when she adds lemon juice. Lemon juice is an acid, which causes a chemical reaction. It turns from purple to pink because of the acid. Lmk if it's right but I'm 99.9% percent certain it is correct.
Write a balanced half-reaction for the oxidation of solid manganese dioxide to permanganate ion in acidic aqueous solution. be sure to add physical state symbols where appropriate.
Answers
The balanced oxidation half equation is given below:
MnO₂ + H₂O → MnO₄⁻ + H⁺ + 3 e⁻What are oxidation reactions?Oxidation reactions are reactions in which the oxidation of the species increases.
Oxidation reactions can involve addition of oxygen or electronegative elements to a substance or the removal of hydrogen or electropositive elements from a substance.
The balanced half-reaction for the oxidation of solid manganese dioxide to permanganate ion in acidic aqueous solution is given below:
MnO₂ + H₂O → MnO₄⁻ + H⁺ + 3 e⁻
In conclusion, the balanced oxidation half equation shows that three electrons were lost by the manganese (iv) ion to form manganese (vii) ion.
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a Draw two different compounds, one in each box, using the representations for atoms
of element X and element Z given below.
Atom of element X = O
Atom of element Z = ●
b Draw a mixture of these two compounds.
Answers
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the compound formed using element X and Z is X \(_O\)Z●.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond. The compound formed using element X and Z with their respective atoms is X \(_O\)Z●. Atoms are written on the foot of the element.
Therefore, the compound formed using element X and Z is X \(_O\)Z●.
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A flexible container contain 37. 4 gram of oxygen ga at a preure of 890. 0 mmHg and a temperature of 55. 00 oC. What i the volume of the ga in the container in L?
Answers
After solving the equation the volume of the gas in the container is 26.6L.
What is ideal gas law?
Pressure times volume are equal to moles times the universal gas constant times temperature, according to the ideal gas law formula.
PV=nRT
where P is for pressure
n = number of moles, where V = volume
T stands for temperature.
R is the gas constant
Energy units per temperature increase per mole are measured by the gas constant R. It is sometimes referred to as the molar gas constant, the ideal gas constant, and the universal gas constant.
Depending on the units you use in your computation, the gas constant R has a different value.
To convert degree celcious to kelvin, 55degree C+273= 328K
To convert pressure from mmHg to atm= 890/760=1.17atm
Number of moles of oxygen= 37.04/32=1.16mol
V= nRT/P
=1.16*0.0821*328/1.17
=26.6L
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Calculate the volume of a sample of nitrogen gas (N2) at 275°C if this sample has a volume of 10 L at 500°C and the pressure of the gas is constant.
Answers
The volume of a sample of nitrogen gas is 7.08 L
It is given that
volume of gas at 500°C = 10 L = 773 k
We have to find
volume of gas at 275°C = 548 k
Charles Law states that the volume of a given mass of a gas is directly proportional to its Kevin temperature at constant pressure. In mathematical terms, the relationship between temperature and volume is expressed as
The physical principle known as Charles' law states that the volume of a gas equals a constant value multiplied by its temperature as measured on the Kelvin scale (zero Kelvin corresponds to -273.15 degrees Celsius).
V1/T1 = V2/T2
10/773 = V2/548
V2 = 7.08 L
Hence, volume of a sample of nitrogen gas is 7.08 L
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write the dissociation reaction of ammonium chloride. explain whether the cation and/or the anion will react with water.
Answers
The anion, Cl-, will not react with water because it is a spectator ion and does not participate in the reaction. It remains as a dissolved ion in the solution. The dissociation reaction of ammonium chloride (NH4Cl) in water is as follows:
NH4Cl (s) → NH4+ (aq) + Cl- (aq)
Here, ammonium chloride dissociates into its constituent ions – ammonium cation (NH4+) and chloride anion (Cl-) – in the presence of water. The cation (NH4+) and anion (Cl-) both can react with water due to their ionic nature. The ammonium cation can undergo hydrolysis to produce acidic solutions by donating a proton (H+) to water molecules, which leads to the formation of ammonium hydroxide (NH4OH):
NH4+ (aq) + H2O (l) ⇌ NH4OH (aq) + H+ (aq)
On the other hand, the chloride anion (Cl-) being the conjugate base of a strong acid (HCl) does not undergo hydrolysis and remains unchanged in aqueous solutions.
The dissociation reaction of ammonium chloride (NH4Cl) involves the separation of its cation and anion in water. The reaction is as follows:
NH4Cl (s) → NH4+ (aq) + Cl- (aq)
In this reaction, NH4+ is the cation and Cl- is the anion. The cation, NH4+, will react with water to form NH3 (ammonia) and H3O+ (hydronium ion) in a process called hydrolysis:
NH4+ (aq) + H2O (l) → NH3 (aq) + H3O+ (aq)
However, the anion, Cl-, will not react with water because it is a spectator ion and does not participate in the reaction. It remains as a dissolved ion in the solution.
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Briefly explain how electron orbitals and energy levels relate to the structure of an atom.
Answers
the element to atomic 35 belong to_____ A, s-block B,P-block c, d-block D,f-block
Answers
Answer:
B
Explanation:
p block bc its last orbit is 4p5
Answer:
Explanation:
P. block
you want to find the actual amount of reactants that are needed to get a desired amount of product. which information is required?
Answers
To find the actual amount of reactants that are needed to get a desired amount of product, you would need the balanced chemical equation for the reaction, the molar mass of the reactants and products, and the desired amount of product.
When balancing a chemical equation, coefficients are added to ensure that the same number of atoms of each element is present on both sides of the equation. This means that the coefficients represent the number of moles of each reactant and product that are involved in the reaction. Therefore, the balanced chemical equation is essential for determining the stoichiometry of a reaction, which is the study of the quantitative relationships between reactants and products in a chemical reaction. Once the balanced chemical equation is known, the molar mass of each reactant and product is needed to convert between mass and moles. Molar mass is the mass of one mole of a substance, which is found by adding up the atomic masses of all the atoms in a molecule. For example, the molar mass of water (H2O) is 18.015 g/mol because it contains two hydrogen atoms with a molar mass of 1.008 g/mol each and one oxygen atom with a molar mass of 15.999 g/mol.
To determine the actual amount of reactants needed to produce a desired amount of product, the stoichiometry of the reaction is used to calculate the theoretical yield, which is the maximum amount of product that can be obtained from a given amount of reactant. The theoretical yield is found by using the balanced chemical equation to determine the mole ratio between the reactants and products and then multiplying by the amount of limiting reactant present. The limiting reactant is the reactant that is completely consumed in a reaction, limiting the amount of product that can be formed. To determine the limiting reactant, the amounts of each reactant are compared using their molar masses and the mole ratio from the balanced chemical equation. The reactant that produces the least amount of product is the limiting reactant.
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how do you find an electron affinity?
Answers
Answer:
Explanation:
Electron affinity is the measure of an atom 's tendency to form a negative ion. Electron affinity can be measured by the amount of energy released when an electron is added to an atom to form a negative ion. When forming a negative ion, an atom undergoes the following reaction:: atom + electron (e -) -> negative ion + energy
what is a household product, food, or drink with a ionic, polyatomic, or covalent compound?
Answers
Answer:
table salt
Explanation:
A farmer wants to start growing sweetcorn on his farm. He has found out that sweetcorn grows best in soil with a pH value of approximately 7.5. Explain how he can use the knowledge of acids, alkalis, and neutralisation to find out the pH value of his soil to make sure he gets the best crop possible
Answers
Answer:
The process to use this knowledge is explained as below:
Explanation:
1. Farmer should use an indicator to check the pH value of the soil of the field of the farm.
2. If the field or the farm has alkali soil add acid to reduce the pH value.
3. If the soil of the farm is acidic for the crop add alkali to increase the pH value.
4. It will be a neutralization reaction and changes the pH value of the farm.
5. Weather/leeching into the surrounding soil/plant or animal waste will lead to a change in pH value over time.
6. The pH value will need to be regularly monitored and adjusted.
Pls help 1 mole of Mg C2 H3O2 and answer last three
Answers
1 mole MgC2H3O2
Step 1
Information needed: The mass of each element per mol (the periodic table is recommended to use)
Mg) 24.305
C) 12.011
H) 1.007
O) 15.999
--------------
Step 2
Procedure:
1 mole MgC2H3O2 = 24.305 (Mg) + 2 x 12.011 (C) + 3 x 1.007 (H) + 2 x 15.999 (O) = 83.346 g
Therefore, the molar mass of MgC2H3O2 = 83.346 g/mol
Answer: 1 mole MgC2H3O2 = 83.346 g
---------------------
CaCO3:
The masses per mole:
Ca) 40.078
C) 12.011
O) 15.999
1 mole CaCO3 = 40.078 + 12.011 + 3 x 15.999 = 100.08 g
-------------------
Cu(CN)2:
The masses per mole:
Cu) 63.546
C) 12.011
N) 14.006
1 mole Cu(CN)2 = 63.546 + 2 x 12.011 + 2 x 14.006 = 115.58 g
---------------------
Na2CO3:
Na) 22.989
C) 12.011
O) 15.999
1 mole Na2CO3 = 2 x 22.989 + 12.011 + 3 x 15.999 = 105.98 g
what is the iupac name of OHC(CH2)3CH(CH3)CO2H
Answers
The IUPAC name of OHC(CH2)3CH(CH3)CO2H is 4-hydroxy-4-methylpentanoic acid.
What is the iupac name of OHC(CH2)3CH(CH3)CO2H?
To determine the IUPAC name of the organic compound, we will follow the steps below:
The longest chain of carbon atoms in the molecule contains 6 carbons. So, the base name is pentanoic acid.The carboxylic acid group (-CO2H) is attached to carbon-1 of the pentanoic acid chain. So, the full name is pentanoic acid.There is a hydroxyl group (-OH) attached to carbon-4 of the pentanoic acid chain. So, the prefix hydroxy is added and the name becomes 4-hydroxypentanoic acid.There is a methyl group (-CH3) attached to carbon-4 of the pentanoic acid chain. So, the prefix 4-methyl is added and the name becomes 4-methyl-4-hydroxypentanoic acid.Finally, the positions of the hydroxyl and methyl groups are indicated by the lowest possible numbers and the name becomes 4-hydroxy-4-methylpentanoic acid.Learn more about IUPAC name here: https://brainly.com/question/28872356
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How can you drop two eggs the fewest amount of times, without them breaking? Whoever gets this right I will mark them brainlyest. (don't know if I spelled that right)
Answers
Answer:
Okay well simply drop it from one inch on to the ground and it won't break and you could put it into a basket with bubble wrap.
Explanation:
Well if you wrap the egg into bubble wrap a few times them put it into a basket (its your choice) then it won't break because the bubble wrap will just pop a few times but sometimes it depends on where you are dropping it from.
Have a blessed day bye! ;)
Which is a process that involves collecting information and ideas that are supported by belief or opinion?
science
systematics
pseudoscience
hypothesis
Answers
Answer:
The answer is C
Explanation:
I did it on edge
How many liters of wine can be held in a wine barrel whose capacity is 30.0 gal?
Answers
1 gallon is approximately 3.78541 liters, so to convert to liter, we can multiply by this number:
\(30.0gal=30.0\cdot3.78541L=113.562L\approx114L\)So, 30.0 gal is approximately 114L.
for example, an environmental signal could be required to allow the activator into the nucleus, as is the case for yeast pho4. the activator binds to
Answers
Activation of yeast Pho4 transcription factor requires environmental signal for nuclear entry.
What environmental signal is required for activation of yeast Pho4 transcription factor?
In yeast, the transcription factor Pho4 serves as an activator for genes involved in phosphate metabolism. However, Pho4 requires an environmental signal, specifically low levels of extracellular phosphate, to enter the nucleus and activate gene expression. This is due to the presence of a phosphorylation site on Pho4 that prevents its nuclear localization until it is dephosphorylated by a phosphatase in response to low phosphate levels.
Once dephosphorylated, Pho4 can bind to target gene promoters and activate transcription. This mechanism ensures that genes involved in phosphate metabolism are only expressed when the cells are experiencing phosphate limitation, allowing for efficient resource utilization.
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Atoms of the element sodium want to give up an electron because sodium atoms
Answers
Sodium is highly electropositive thus it can easily give out one electron from the outermost shell of the atom of the element.
Why does sodium give up an electron?We know that sodium is an element that has been found to be a member of group one of the periodic table. This implies that the sodium has only one electron in the outermost shell of the atom. As such, the sodium atom is quite very reactive and we observe that the sodium atom does loose electron easily.
The elements that are in the first group of the periodic table are highly electropositive and this is what informs the fact they have a tendency to loose electrons quickly.
When the sodium atom looses an electron, it forms a univalent positive ion and there is a loss of an entire shell and this is why we find out that sodium does not occur in a free sate in nature owing to the fact that it tends to react very much.
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The below table compares the number of electrons in two neutral atoms.
atom:
Ne 10
Na 11
Compare the electron configuration and atomic radius of these two atoms and use that to explain the difference in their reactivity.
Answers
Ten grams of a solute is dissolved in 500 mL, and the solution has an osmotic pressure of 10 mm Hg. What other information is needed before determining the molar mass of the solute
Answers
The solution's osmotic pressure is given as 10 mm Hg. If we want to figure out the molar mass of the solute, we'll need to know the temperature at which the osmotic pressure was measured. To calculate the molar mass of the solute, we will use the formula for osmotic pressure: π = MRT
The solution's osmotic pressure is given as 10 mm Hg. If we want to figure out the molar mass of the solute, we'll need to know the temperature at which the osmotic pressure was measured. To calculate the molar mass of the solute, we will use the formula for osmotic pressure: π = MRT,
where π is the osmotic pressure, M is the molarity, R is the ideal gas constant, and T is the temperature in Kelvin. To solve for molarity (M), we need to rearrange the equation and substitute the given values: π = MRT → M = π/RT
Substituting the known values into the equation: π = 10 mm Hg = 10 torr
R = 0.0821 L·atm/K·mol (the ideal gas constant)
T = ? (the temperature in Kelvin is not given)
M = ? (molarity)
We can't solve for molarity without knowing the temperature. To calculate the molar mass of the solute, we'll need to know the molarity. We will use the formula M = n/V, where n is the number of moles of solute and V is the volume of solution in liters.We can calculate the number of moles of solute using the mass of the solute and its molar mass:n = mass/molar massIn this case, we need to know the molar mass, which we can calculate if we know the molarity of the solution. So, the temperature at which the osmotic pressure was measured is needed before determining the molar mass of the solute.
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Given that the magic numbers for protonsIneutrons are 2, 8, 20,28,50, 82,and 126,which ofthe following are double magic nuclei? Select all that apply: 160 Ca 78Ni 62 Ni
Answers
The double magic nuclei among the given options are 16O and 78Ni.
Based on the magic numbers for protons and neutrons, the double magic nuclei are the ones that have both their proton and neutron numbers as magic numbers. From the given options:
1. 16O (Oxygen-16): It has 8 protons and 8 neutrons, both of which are magic numbers. So, 16O is a double magic nucleus.
2. 78Ni (Nickel-78): It has 28 protons (a magic number) and 50 neutrons (a magic number). Therefore, 78Ni is a double magic nucleus.
3. 62Ni (Nickel-62): It has 28 protons (a magic number) but 34 neutrons, which is not a magic number. Thus, 62Ni is not a double magic nucleus.
So, the double magic nuclei are 16O and 78Ni.
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What element does Chlorine go in?
- metals
-not metals
-Metalloids
Answers
Answer:
non of them it is
halogen elements