Answer:
%Copper = 25.42 %
Explanation:
For solving this problem one first write down the half reactions as;
Reduction of Cu²⁺ to Cu⁺¹ by I⁻:
2 Cu²⁺ + 4 I⁻ → 2 CuI + I₂
Secondly, the titration reaction between Na₂S₂O₃ with I₂ as;
2 S₂O₃²⁻ + I₂ → S₄O₆²⁻ + 2 I⁻
Now, Calculate Moles of S₂O₃²⁻ as;
Moles = Molarity × Volume
Putting values,
Moles = 0.1 mol/L × 0.02 L
Moles = 0.002 moles of S₂O₃²⁻
From first two equations we can conclude that,
2 moles of S₂O₃²⁻ liberated I₂ produced by = 2 moles of Cu²⁺
So,
0.002 moles of S₂O₃²⁻ will liberate I₂ produced by = X moles of Cu₂⁺
Solving for X,
X = 0.002 mol × 2 mol / 2 mol
X = 0.002 mol of Cu²⁺
So, we require 0.002 moles of Cu²⁺ to produce I₂ enough for titrating with 0.1 M (20.00 mL) sodium thiosulphate solution.
Now, Calculate mass of Copper as,
Mass = Moles × A.Mass
Mass = 0.002 mol × 63.55 g/mol
Mass = 0.1271 g of Copper
Lastly, calculate % copper as,
%Copper = 0.1271 g / 0.500 g × 100
%Copper = 25.42 %
Final answer:
To calculate the percent copper in a sample using iodometric titration, the amount of sodium thiosulphate used in the titration reveals the moles of copper present. The mass of copper is then calculated, allowing us to find that the sample is 25.42% copper.
Explanation:
To determine the percent copper in the sample using iodometric titration, we first need to understand the chemistry involved. The reaction between Copper (II) and iodide produces iodine, which is then titrated with sodium thiosulphate. The formula for calculating the percent copper is based on the stoichiometry of these reactions.
Given that 20.00 [tex]cm^3[/tex] of 0.1 M sodium thiosulphate is required, we can calculate the moles of sodium thiosulphate reacted: Moles of sodium thiosulphate = 20.00 [tex]cm^3[/tex] × 0.1 mol/L = 0.0020 mol.
Sodium thiosulphate reacts with iodine in a 1:1 molar ratio, meaning 0.0020 mol of iodine was produced. The stoichiometry between copper (II) and iodine is also 1:1, so 0.0020 mol of Copper (II) was initially present. The molar mass of Copper (II) is 63.546 g/mol, hence the mass of copper in the sample is 0.0020 mol × 63.546 g/mol = 0.1271 g.
To find the percent copper, we then use the formula: Percent Copper = (Mass of Copper in the Sample / Total Mass of the Sample) × 100 = (0.1271 g / 0.500 g) × 100 = 25.42%.
As light travels from air to water to gas
What is the percent by mass of hydrogen in, C9H6O3
Hey there!
Molar mass of ( C₉H₆O₃ ) = 162.14 g/mol
atomic mass H = 1.007 amu
Therefore :
H% = atomic mass H / molar mass ( C₉H₆O₃ ) x 100
H % = ( 1.007 / 162.14 ) x 100 =
H% = 0.00621 x 100 =
H% = 0.621
Natural selection is the primary mechanism of _______.
A.
reproduction
B.
biodiversity
C.
adaptation
D.
evolution
Answer:
the answer is evolution the other person made me get it wrong
Explanation:
Individuals within populations exhibit some diversity. As a result of possessing slightly different traits, some individuals are better able to survive and reproduce than others. As these individuals are naturally selected, changes in the characteristics of the populations may occur over time. The cumulative change in these characteristics is known as evolution.
So, natural selection is the primary mechanism for evolution.
MARK ME BRAINLIEST.
YOUR WELCOME
Answer:
C
Explanation:
Evolution
The Calvin cycle converts ATP and NADPH to
a0
Answer:
The Calvin cycle converts ATP and NADPH to "convert CO2 to sugar".
Explanation:
When carbon dioxide reaches inside the leaf through pores called stomata in plants and spreads to the chloroplast stroma, it act as the location of Calvin cycle reactions where sugar is naturally produced.The light-independent processes are also called such reactions as they are not primarily guided by light.
The Calvin cycle processes can be separated into three main channels: carbon fixation, reduction, and starting molecule's regeneration as explained below:
Carbon Fixation: Six-carbon compound are generated in this step that bifurcate into two molecules (three-carbon compound) 3-phosphoglyceric acid (3-PGA), catalyzed by the enzyme rubisco or RuBP carboxylase/oxygenase.Reduction: In this phase of the cycle 3-PGA molecules are converted into glyceraldehyde-3-phosphate (G3P) i.e three-carbon sugar by using ATP and NADPH.Regeneration: Many G3P molecules are used to generate glucose, while others have to be recycled to recreate the acceptor RuBP.What is the change of state that occurs in the condenser
Answer:
Explanation:
The high temperature refrigerant passes into a condenser coil. As the vapor refrigerant travels through the coil, air from a fan passes over the coil to cool the vapor refrigerant. As the vapor cools it condenses and becomes a liquid, which is referred to as a change of state.
In the mathematical equation showing that pressure (P) multiplied by volume (V) remains equal to a constant (k) pressure and volume are ___________ proportional
Answer:
Inversely
Explanation:
pV = k
When p increases, V must decrease for k to remain constant.
When V increases, p must decrease for k to remain constant.
When the product of two variables is a constant, they are inversely proportional to each other.
The crust below the oceans is _____. thicker than the crust below the continents made of basalt and salt sediment made of sedimentary rock made of granite thinner than the crust below the continents
The crust below the ocean and ocean floor is thinner than the crust below the Earth's continents.
Answer:
it is filled with basalt
Explanation:
CH4 + O2 - CO2 + 2H2O
Many fuels, such as gasoline and diesel fuel, are hydrocarbons. Hydrocarbons are molecules that contain only hydrogen and carbon. Choose all of the criteria below that would make a hydrocarbon a good fuel in terms of enthalpy.
A Hydrocarbons burn to absorb a large amount of energy.
B Burning hydrocarbons produces a lot of energy.
C Breaking carbon-hydrogen and carbon-carbon bonds gives off energy.
D The enthalpy of combustion is a large negative value.
Answer:
Its B, C, and D.
Look at photo for proof.
A hydrocarbon would be a good fuel in terms of enthalpy if it produces a lot of energy when burned and has a large negative enthalpy of combustion. The correct option is (B).
Explanation:In terms of enthalpy, a good fuel would be one that releases a large amount of energy when burned. This means that burning hydrocarbons should produce a lot of energy (option B).
Breaking carbon-hydrogen and carbon-carbon bonds in hydrocarbons actually requires energy, so it doesn't contribute to the enthalpy of combustion (option C).
The enthalpy of combustion is defined as the heat released when one mole of a substance is burned completely in oxygen. Since the combustion of hydrocarbons releases a large amount of heat energy, the enthalpy of combustion is a large negative value (option D).
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what other animals do you know about that have unique forms of self defense
Answer:
there are certain spiders with some pretty weird/ cool self defense techniques
How many atoms are there in NaCI
Complete the paragraph about the formation of sodium phosphide.
Electrons are transferred from atoms of
and the phosphorus atoms
to atoms of
C. This transfer makes the sodium atoms
As a result, the sodium and phosphorus atoms strongly
each other.
Answer:
Electrons are transferred from atoms of (sodium) to atoms of phosphorous
The sodium atom (looses electrons) and the phosphorus atoms
(gains electrons) .
This transfer makes the sodium atoms acquire (positive) charge and phosphorous acquire (negative) charge .
As a result, the sodium and phosphorus atoms strongly (attract) with
each other.
Explanation:
In the paragraph about the formation of sodium phosphide: Electrons are transferred from atoms of sodium to atoms of phosphorous. This transfer makes the sodium atoms acquire positive charge and phosphorous acquire negative charge. As a result, the sodium and phosphorus atoms strongly attract each other.
Between the phosphorous (P) and sodium (Na) atoms, electron transfer occurs to generate sodium phosphide. When phosphorus receives electrons from sodium, sodium loses electrons, leaving sodium ions (Na⁺) with a positive charge and phosphide ions (P³⁻) with a negative charge as a result.
The oppositely charged ions are attracted to one another strongly electrostatically as a result of this charge difference. This kind of link, referred to as an ionic bond, results in the creation of sodium phosphide (Na₃P), a stable molecule in which several sodium ions are completely encircled by phosphide ions, solidly keeping them together in a crystal lattice structure.
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Balance this equation. If a coefficient of "1" is required, choose "blank" for that box. CO + O2 → CO2
Answer:
2co + o2 > 2co2
Explanation:
so that is tye answer
Answer:
CO + O2 → CO2
To balance the equation, the atoms of elements on the left side must equal the atom of same element on the right side.
To balance the equation, put 2 in front of CO and 2 in front of CO2 as illustrated below:
2CO + O2 → 2CO2
The coefficients are 2, 1, 2
Which two elements in group 14 on the periodic table most likely to be malleable and good conductors of electricity
Answer:
Tin & Lead
Explanation:
They are metals and can conduct electricity because their outer electrons are not localized, i.e., they are not bound to specific atoms.
The energy level of electrons in the "conduction band" overlaps that of valence electrons. These electrons are more like a cloud dispersed throughout the piece of metal so that when an electric field is applied, they can move around.
The two element in 14th group of periodic table most likely to be malleable and good conductors of electricity are lead and tin. They are mostly existing in metallic state.
What are conductors ?Conductors are materials that can easily pass electricity through it at normal temperature. Metals are all good conductors. In addition metals have some peculiar features such as malleability, ductility, luster etc.
14th group elements are carbon family. In this group, carbon at normal temperature exists as gas. Silicon and germanium are semiconductors. Lead and tin are metallic in nature and they are malleable as well.
Lead and tin can be shaped and sized as desired and they are used in various electronic devices also because they are good conductors at metallic state. Therefore, tin and lead are the two elements.
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Are all individuals in a population of animals or a population of plants identical
Answer:i’m not sure sorry
Explanation:
The table below shows properties of the element gold (Au).
Property Gold's
Characteristics
Color yellow
Density 19.32 g/mL
Electronegativity 2.54
Ionization Potential 9.225
Boiling Point 2807°C
Melting Point 1064.58°C
A physical property of gold is _______.
A.
density of 19.32 g/mL
B.
melting point of 1064.58°C
C.
boiling point of 2807°C
D.
all of these
Answer:
a) but also wouldn't the physical property of gold be malleable?
Explanation:
the change in state from a solid to a liquid is called
Answer:
melting
Explanation:
How efficient are electric engines
Answer:
Electric engines have efficiencies of roughly 90% whilst combustion engines about 10% to 30%. This is because combustion engines emit much more heat, which is always energy that is not used as work, and thus increases inefficiency.
Explanation:
Which of the following can be said about the boiling point of a liquid?
Explanation:
Boiling point
It is the temperature at which liquid changes into gaseous state .
or it can be defined as :
the temperature at which the vapor pressure of a liquid becomes equals to atmospheric pressure .
It depends upon many factors :
Temperature Pressure Inter molecular forces present Environmental pressure or vapor pressureTemperature : more is the temperature , more is the vapor pressure hence more is the boiling point .
Pressure : More is the pressure , ore is the boiling point or vice versa .
Intermolecular forces in particles of matter : more are the forces , less is the boiling point as they will have no escaping tendency .
The boiling point of water is : 100 degree celsius
How many molecules of O2 will be formed from 34.35 grams of KClO3?
Answer:
8
Explanation:
in the name, iron(III) oxide, the (III) represents
A) the number of iron atoms
B) the number of oxygen atoms
C) the electrical charge of oxygen
D) the electrical charge of iron
To attain stability the chemical bond is formed .
Chemical bond
It is a kind of linkage that binds one atom with the other .
The atoms do so in order to attain stable noble gas configuration .
To form chemical bond they either:
Loose electrons : when atoms loose electrons they acquire positive charge which is equal to the number of electrons lost .
Gain electrons: After gaining electrons they acquire negative charge which is equal to the number of electrons gained by an atom.
share electrons : With sharing no charges are develop .
In the above asked question when iron combines with oxygen it forms iron oxide : where iron looses 3 electrons and oxygen gains 2 electrons .That is the reason ,III here represents the electrical charge of iron
The probability of finding electrons in certain regions of an atom is described by?
orbits.
orbitals.
quanta.
photons.
Answer:
orbits
Explanation:
An orbital is a region of space where there is a high probability of finding an electron.
How to balance K2SO4+BaCl2= BaSO4+KCl
Answer:
The answer is K2SO4 + BaCl2 = BaSO4 + 2KCl
Explanation:
First, you can do it by looking how many chlorine is being used. As you can see that 2 chlorine is being used so you are sure that 2 chloine is in the right side.
Secondle, there are also 2 potassium in the left side so there must be also 2 potassium in the right side.
K2 + Cl2 = K2Cl2 (to make it beautiful)
= 2KCl (you can take out 2, just similar to factorisation)
(Hope this can help)
Final answer:
The balanced equation for the reaction between K2SO4 and BaCl2 to produce BaSO4 and KCl is K2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2KCl(aq). BaSO4 is an insoluble precipitate, and the balance is achieved by having 2 moles of KCl in the products to match the potassium atoms.
Explanation:
To balance the chemical equation K2SO4(aq) + BaCl2(aq) → BaSO4(s) + KCl(aq), we need to ensure that the number of atoms of each element on the reactant side is equal to the number on the product side. Initially, we have 2 potassium (K) atoms on the reactant side and only 1 potassium atom on the product side. We also have 1 barium (Ba) atom, 1 sulfate (SO4) group, 2 chloride (Cl) atoms on the reactant side, and the same on the product side. To balance the equation, we simply need to adjust the coefficient in front of KCl to 2, as shown in the balanced equation:
K2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2KCl(aq)
By doing this, we ensure that the number of potassium atoms is now 2 on both sides, and the chlorides are also balanced with 2 atoms on each side. The product BaSO4 is insoluble and will form a precipitate, while the other products remain in solution.
Pick a one world factor to describe the benefits and limitations of Bromine
A one world factor to describe the benefits and limitations of Bromine are water purification compound.
Explanation:
Benefits of bromine
Bromine is used to make organobromo compounds. Dibromoethane is an agent for leaded gasoline, largely stepped out due to environmental considerations. In fire extinguishers, pharmaceutical products and insecticides, organobromines are used. Bromine applied in dyes production, water purification compounds, fumigants, sanitizes, medicinal, photography, flame proofing agents. In citrus beverages, bromine used as emulsifier.Limitations of bromine
Organic bromines are used as protecting and disinfecting agents, because microorganisms has its damaging effect. Once it is used in greenhouses and on farmland they can easily wash off to surface water, which has negative health effects on algae, daphnia, lobsters and fishes. The animals effected on DNA damage and nerve damage which can leads to development of cancer. Organic bromines can damage organs such as kidneys, liver, lungs. Ethylene bromine can cause cancer.
what mass in grams, of aluminum fins could 3088J of energy heat from 14.77 degrees C to 26.31 degrees C? Aluminum has a specific heat of 0.897/J (g degrees Celsius)?
Answer:
298.32 grams
Explanation:
Amount of energy required by known amount of a substance to raise its temperature by one degree is called specific heat capacity.
The equation used for this problem is as follow,
Q = m Cp ΔT ----- (1)
Where;
Q = Heat = 3088 J
m = mass = ??
Cp = Specific Heat Capacity = 0.897 J.g⁻¹.°C⁻¹
ΔT = Change in Temperature = 26.31 °C - 14.77 °C = 11.54 °C
Solving eq. 1 for m,
m = Q / Cp ΔT
Putting values,
m = 3088 J / (0.897 J.g⁻¹.°C⁻¹ × 11.54 °C)
m = 298.32 g
what is the name of Fe(OH)3
Answer:Iron(|||) Hydroxide
Explanation:Fe is iron and OH is hydroxide
Final answer:
Iron(III) hydroxide is the name of the compound Fe[tex](OH)_{3}[/tex], a reddish-brown precipitate formed by iron in the +3 oxidation state combining with hydroxide ions.
Explanation:
The compound with the chemical formula Fe[tex](OH)_{3}[/tex] is known as iron(III) hydroxide. It can also be referred to as ferric hydroxide. This compound is formed when iron ions in the +3 oxidation state (Fe³⁺) combine with hydroxide ions (OH⁻) in a 1:3 ratio, resulting in the reddish-brown precipitate that is represented by the formula Fe[tex](OH)_{3}[/tex]. The chemical reactions provided, such as Fe(OH)₃ (s) + 3Na⁺ (aq) + 3NO₃⁻(aq), highlight the chemical processes involving iron(III) hydroxide in various contexts. In the case of FeCl₃(aq) + NaOH(aq), when a solution containing iron and a hydroxide is mixed, a precipitate of iron(III) hydroxide forms along with the resulting sodium chloride.
Suppose the boy skipped his lunch for a day how will the hormones from his pancreasls help his body to cope wwhen his blood sugar level drops below normal
Answer:
The hormone glucagon secreted by the pancreatic cells cause the release of glucose from the body's storage.
Explanation:
The pancreas is an organ found inside the abdomen. This organ produces hormones such as:
InsulinGlucagonSomatostatinVasoactive intestinal peptideInsulin and glucagon are considered primary hormones secreted by the pancreas.
Upon skipping a meal, leading to a drop in blood sugar levels, glucagon is secreted by the pancreas. This hormone then acts on the liver to stimulate the conversion of stored up glycogen present in the liver into glucose. This produced glucose is then released into the blood stream, availing the boy glucose for energy.
The hormone of glucagon that is released by pancreas helps the body cope when the blood sugar level drops below normal.
Role of GlucagonThe hormones from his pancreas release glucagon that helps the body to cope when his blood sugar level drops below normal because the body needs energy so it takes the sugar from the storage present inside the body. If blood sugar level falls too low, the pancreas releases glucagon which tells the liver to make more glucose.
Glucagon is a hormone that is responsible for the making of glucose from the stored energy in the body so we can conclude that the hormone of glucagon that is released by pancreas helps the body cope when the blood sugar level drops below normal.
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what is a polar functional group?
I think this is the answer
Final answer:
A polar functional group is a cluster of atoms within a molecule that has polar preferences due to the uneven distribution of electrons, resulting in areas with partial positive and negative charges which enable it to participate in various chemical reactions and interactions with other polar substances, such as water.
Explanation:
A polar functional group is a specific grouping of atoms within a molecule that has a polarized distribution of charges, which means there is an uneven distribution of electron density. This polarity arises because of the presence of electronegative atoms like oxygen, nitrogen, or fluorine, which attract electrons more strongly than other types of atoms in the functional group. These groups have partial positive and negative charges at different points and are often involved in chemical reactions due to their ability to interact with other molecules and ions. A classic example of a polar functional group is the hydroxyl group (-OH), common in alcohols and known for being hydrophilic or water-loving, meaning it can form hydrogen bonds with water and dissolve easily in it. Other examples include carbonyl groups (C=O) in ketones and aldehydes, carboxyl groups (-COOH) in amino acids and fatty acids, and phosphate groups (-PO4) often found in DNA and ATP.
CARBON DIOXIDE DOES NOT EXIST IN A LIQUID STATE
UNTIL THE PRESSURE IS AT LEAST 5.1 ATMOSPHERES.
CONVERT THIS PRESSURE TO a) TORR, AND b) kPa.
Witch is the best example of natural selection ?
A . Some insects in a population survive temperature changes and pass their traits on to their offspring
B . A deer population is rapidly killed off by a forest fire.
C. A few mice from population randomly die from a disease, while surviving mice are not able to reproduce and slowly die off.
D. An injured bald eagle is captured and placed in a wildlife where it survives for 10 years