Answer:
\(CH_4 + 2O_2 --> CO_2 + 2H_2O\)
Explanation:
The chemical formula for methane is \(CH_4\)
The chemical formula for oxygen is \(O_2\)
The chemical formula for carbon dioxide is \(CO_2\)
The chemical formula for water is \(H_2O\)
Methane burns in oxygen to give carbon dioxide and water:
\(CH_4 + O_2 --> CO_2 + H_2O\)
The balanced equation that will ensure an equal number of each atom on the left and right-hand sides of the equation would be:
\(CH_4 + 2O_2 --> CO_2 + 2H_2O\)
Explain how the two atoms in a chlorine molecule are held together
The chlorine atoms can be held together by the dispersion forces.
How are the chlorine atoms held together?We know that the chlorine atoms are the atoms that we could say that they have an electronegativity value that is almost the same. As such we can see that the the compound is non polar.
Given the fact that the compound is non polar, the atoms would be held together by a kind of bond that not polar in nature and these are the dispersion forces that hold the non polar molecules together.
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Why do you need to combust benzoic acid before testing the "unknown" sample you are interested in? Why do you need to combust more than one sample of the "unknown" you are testing?
Various samples of the must be combusted in other to obtain a reliable result.
What is a bomb calorimeter?The bomb calorimeter is used to obtain the energy of a sample. This is called the energy equivalent or the energy value of the sample.
Now, we know that the bomb calorimeter is calibrated by the use of benzoic acid hence it must be combusted first to obtain the basic energy value of the calorimeter.
Various samples of the must be combusted in other to obtain a reliable result.
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Hydrogenation reactions, in which H, and an "unsaturated" organic
compound combine, are used in the food, fuel, and polymer industries.
In the simplest case, ethene (C2H4) and H2 form ethane (C2H6). If 134 kJ
is given off per mole of C›H4 reacting, how much heat (in kJ) is released
when 13.6 kg of C2H, forms? Enter a positive number since released
implies a negative number. Enter to O decimal places
Total, 65,071 kJ of heat is released when 13.6 kg of Ethene reacts to form C₂H₆.
To calculate the amount of heat released when 13.6 kg of C₂H₄ reacts to form C₂H₆, we need to use the given energy change per mole of C₂H₄ and convert the mass of C₂H₄ to moles.
The molar mass of C₂H₄ (ethylene) is approximately 28 g/mol.
First, let's we convert the mass of C2H4 to moles;
Mass of C₂H₄ = 13.6 kg = 13,600 g
Moles of C₂H₄ = Mass of C₂H₄/Molar mass of C₂H₄
Moles of C₂H₄ = 13,600 g / 28 g/mol
≈ 485.71 mol
Next, we can calculate the amount of heat released using the energy change per mole of C₂H₄;
Heat released = Energy change per mole of C₂H₄ × Moles of C₂H₄
Heat released = -134 kJ/mol × 485.71 mol
Heat released ≈ -65,071.34 kJ
Now, we take the absolute value;
Heat released ≈ 65,071 kJ
Therefore, approximately 65,071 kJ of heat is released when 13.6 kg of C₂H₄ reacts to form C₂H₆.
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How do you prepare 300 ml buffer of 100 mm tris ph 7. 8 and 250 mm nacl?
A buffer of 300 ml of 100 mM Tris pH 7.8 and 250 mM NaCl can be prepared by dissolving 3.64 g of Tris and 4.27 g of NaCl in 300 ml of water, and adjusting the pH to 7.8 using 10 ml of 1 M HCl. The % v/v refers to the volume of the solute while % w/v refers to the weight of the solute.
To prepare a 300 ml buffer of 100 mM Tris pH 7.8 and 250 mM NaCl, you need to follow the following steps:1. Calculate the amount of Tris required to prepare 100 mM solution of Tris, which is equal to 100 mM x 0.3 L = 0.03 moles. The molecular weight of Tris is 121.14 g/mol. Thus, the amount of Tris required is 3.64 g.2. To make the buffer of pH 7.8, use HCl or NaOH to adjust the pH. For this, use 1 M HCl or 1 M NaOH to avoid diluting the buffer. Add 10 ml of 1 M HCl to the solution.3. Measure 4.27 g of NaCl and add it to the solution. 4. Add water to the solution to make up the final volume of 300 ml. 5. Mix the solution thoroughly until everything is dissolved. Your buffer of 100 mM Tris pH 7.8 and 250 mM NaCl is now ready. % v/v refers to the percentage volume of a solute in a solvent while % w/v refers to the percentage weight of a solute in a solvent. The percent v/v is calculated by the volume of the solute divided by the volume of the solution while the percent w/v is calculated by the mass of the solute divided by the volume of the solution in which it is dissolved.For more questions on buffer
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The correct question would be as
How do you prepare 300 ml buffer of 100 mM Tris pH 7.8 and 250 mM NaCl? % v/v,% w/v Questions.
A 5.0-mL sample of CO2 gas is enclosed in a gas-tight
syringe (Figure 11.3) at 22 °C. If the syringe is
immersed in an ice bath (0 °C), what is the new gas
volume, assuming that the pressure is held constant?
Answer:
3.5ML
Explanation:
At the constant pressure, the final volume of the carbon dioxide gas was equal to 4.62 ml at a temperature of 0ºC.
What is Charles's law for volume-temperature relation?Charles's law can be explained as when the pressure of the gas is kept constant, the volume of gas is directly proportional to the temperature of a gas.
The volume of the gas and the temperature of the gas have a direct relationship according to this law.
Therefore, V∝ T
or V₁/T₁ = V₂/T₂ ....................(1)
Given, the initial temperature of the CO₂ gas, T₁ = 22 ºC
T₁ = 22 + 273 = 295 K
The final temperature of the CO₂ gas, T₂ = 0ºC
T₂ = 0 + 273 = 273 K
The initial volume of the gas, V₁ = 5 ml
Substitute the value of V₁, T₁, and T₂ in equation (1 ) to get final volume of CO₂ gas:
5/295 = V₂/273
V₂ = 4.6 ml
Therefore, the final volume of the gas is equal to 4.6 ml at 0 ºC, when there is no change in the pressure.
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A gas has a pressure of 4.62 atm when its volume is 2.33 L. If the temperature remains constant, what will the pressure be when the volume is changed to 1.03 L? Express the final pressure in torrs.
The final pressure would be 7905.6 torr when the volume is changed to 1.03 L.
Boyle's law states that
At a steady temperature, the item of weight and volume of a gas is steady.
which implies
P1V1 = P2V2
where
P1 = starting weight
V1 = starting volume
P2 = ultimate weight
V2 = ultimate volume
Substituting the given values into equation (1), we get:
P1 = 4.62 atm
V1 = 2.33 L
V2 = 1.03 L
Rearranging the equation (1)
P2 = P1V1/V2 = (4.62 atm x 2.33 L)/1.03 L = 10.41 atm
To convert atm to torr, ready to utilize the conversion factor:
As we know that 1 atm = 760 torr
so that, the ultimate weight in torr would be:
P2 = 10.41 atm x 760 torr/atm = 7905.6 torr
P2 = 7905.6 torr
Hence, the ultimate weight would be 7905.6 torr when the volume is changed to 1.03 L.
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In the previous step, you determined
0.25 mol HCI reacts. The molar mass
of Mg is 24.31 g/mol.
What mass of Mg is required?
PLEASE HELP ASAP
Approximately 3.04 grams of magnesium would be required to react with 0.25 moles of hydrochloric acid.
To determine the mass of Mg required, we need to use the balanced chemical equation for the reaction between hydrochloric acid (HCl) and magnesium (Mg):
2HCl + Mg → MgCl2 + H2
From the balanced equation, we can see that 2 moles of HCl react with 1 mole of Mg. Therefore, if 0.25 mol of HCl reacts, we would need half of that amount, which is 0.125 mol of Mg.
To calculate the mass of Mg required, we need to multiply the number of moles of Mg by its molar mass. The molar mass of Mg is given as 24.31 g/mol. Therefore, the mass of Mg required can be calculated as follows:
Mass of Mg = Number of moles of Mg × Molar mass of Mg
Mass of Mg = 0.125 mol × 24.31 g/mol
Mass of Mg = 3.04 g
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Sodium nitrate is used in fertilizers, explosives, and glass manufacturing. Give the formula for this compound
How many moles are in 1.7 g of sodium nitrate?
Explanation:
The molecular formula for Sodium Nitrate is NaNO3. The SI base unit for amount of substance is the mole. 1 grams Sodium Nitrate is equal to 0.011765443644878 mole.
What term describes the lowest temperature to which air can be cooled at constant pressure before saturation occurs?
The minimum temperature that air must be chilled to in order to reach saturation at or below 0°C (32°F).
Is the temperature to which air must be cooled at constant pressure to reach saturation?The dew point is the temperature that must be reached while maintaining pressure for the air to become saturated, or for the relative humidity to reach 100%.
Simply said, the boiling point is also known as the saturation temperature. The term "saturation" refers to the temperature that a liquid must reach in order to boil and transition into the vapour phase based on its saturation pressure.
Intensity and chroma are other names for saturation. It speaks to the color's predominant hue. The "pure" hues are found at the outermost portion of the hue wheel. The hue we are using to describe the colour predominates less and less as you travel towards the centre of the wheel.
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A wavelength is defined as the distance from
A. Crest to crest
B. Trough to resting position
C. Crest to trough
D. Crest to resting position
Draw skeletal structures for the cyclopropane (three-membered ring) isomers with a foula of C5 H10
. Note: cyclopropane is a carbon-carbon ring with three carbons:
Here are the skeletal structures for the cyclopropane isomers with the molecular formula C5H10:
Isomer 1: N-butylcyclopropane
CH3-CH2-CH2-CH2-CH2
|
C
/
C---C
Isomer 2: Isobutylcyclopropane
CH3-CH(CH3)-CH2-CH2-CH3
|
C
/
C---C
Isomer 3: Neopentylcyclopropane
(CH3)3C-CH2-CH2-CH2-CH3
|
C
/
C---C
These structures represent the three possible isomers of cyclopropane with the given molecular formula. Each isomer has a different arrangement of atoms while maintaining the cyclopropane ring structure.
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Which of the following cannot be classified as a mixture
A. Stainless steel
B. Rubbing alcohol
C. Table salt (NaCI
D. Granite
Answer:
B) Rubbing alcohol
Explanation:
It is a solution
What is the muscle that when contracted, it allows the lungs to fill with air?
Answer:
It is a large, dome-shaped muscle that contracts rhythmically and continually, and most of the time, involuntarily. Upon inhalation, the diaphragm contracts and flattens and the chest cavity enlarges. This contraction creates a vacuum, which pulls air into the lungs.
Explanation:
Answer:
Explanation:
The muscle that is contracted, it allows the lungs to fill with air through diaphragm muscle.
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4. name and describe the process by which most alcohol is eliminated from the body. how is the remaining alcohol eliminated and how is this useful in testing for alcohol?
The process by which most alcohol is eliminated from the body is called oxidation. In this process, alcohol is metabolized by the liver enzymes into acetaldehyde and then further oxidized into acetic acid. The remaining alcohol is eliminated through other means such as excretion through breath, urine, and sweat. This elimination process is useful in testing for alcohol as it allows the measurement of alcohol levels in breath, urine, and blood samples to determine a person's level of intoxication.
The primary process by which alcohol is eliminated from the body is oxidation. When alcohol is consumed, it is primarily metabolized in the liver by enzymes called alcohol dehydrogenases (ADH). ADH converts alcohol into acetaldehyde, a toxic substance. Acetaldehyde is further metabolized by another enzyme called aldehyde dehydrogenase (ALDH) into acetic acid, which can be further utilized by the body for energy production.
In addition to oxidation, a small amount of alcohol can be eliminated through breath, urine, and sweat. Alcohol molecules in the bloodstream can diffuse into the alveoli in the lungs and be exhaled in the breath, allowing the measurement of alcohol levels through breathalyzer tests. Alcohol can also be excreted in urine and small amounts can be eliminated through sweat.
This elimination process is useful in testing for alcohol as it allows the assessment of alcohol concentration in various bodily fluids. Breathalyzer tests measure the alcohol content in exhaled breath, providing a quick and non-invasive method for estimating blood alcohol concentration. Urine and blood tests can also be used to determine alcohol levels, enabling accurate assessment of intoxication levels for legal and medical purposes.
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a 0.135 g sample of a monoprotic acid of unknown molar mass is dissolved in water and titrated with 0.1003 m naoh. the equivalence point is reached after adding 21.36 ml of base.
Part A
What is the molar mass of the unknown acid?
Molar mass = g/mol
The molar mass of the unknown acid is 150 g/mol.
Mass of acid (m) = 0.135 g
Volume of NaOH = 21.36 mL = 0.02136 L
Concentration of NaOH (c) = 0.1003 M
The balanced equation is:Acid + NaOH → NaSalt + Water
Molar mass of the unknown acid can be calculated by using the formula;molar mass of acid = (mass of acid used × molar mass of NaOH × volume of NaOH used) / (number of hydrogen ions × 1000)
Mass of NaOH = Concentration × volume = 0.1003 × 0.02136 = 0.002145 mol
Mass of acid used = 0.135 g
Molar mass of NaOH = 40 g/mol
Number of hydrogen ion = 1
Volume of NaOH used = 21.36 mL = 21.36/1000 = 0.02136 L
Molar mass of acid = (0.135 × 40 × 0.002145) / (1 × 0.02136)
Molar mass of acid = 149.97 g/mol ≈ 150 g/mol
Therefore, the molar mass of the unknown acid is 150 g/mol.
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when you add hcl to a solution containing aqueous sodium acetylsalicylate (structure shown below), a precipitate formed. which is the structure of this precipitate?
When HCl is added to a solution containing aqueous sodium acetylsalicylate, a precipitate forms, which is sodium salicylate (C7H5NaO3).
When hydrochloric acid (HCl) is added to a solution containing aqueous sodium acetylsalicylate, a precipitate is formed. The precipitate that forms in this reaction is sodium salicylate (C7H5NaO3).
The reaction occurs because hydrochloric acid (HCl) is a strong acid and it reacts with the sodium acetylsalicylate to form sodium salicylate. This reaction is known as a neutralization reaction.
The structure of sodium salicylate (C7H5NaO3) is similar to acetylsalicylic acid (also known as aspirin). It consists of a benzene ring with a carboxyl group (COOH) and a hydroxyl group (OH) attached to it. In the reaction, the sodium acetylsalicylate loses the acetyl group (CH3CO) and the sodium ion (Na+) replaces it, resulting in the formation of sodium salicylate.
The precipitate that forms when HCl is added to the solution containing aqueous sodium acetylsalicylate is sodium salicylate, which is a white, crystalline solid. This precipitate can be separated from the solution by filtration or centrifugation.
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calculate the number of water, x, of crystalization in an unknown sample, having a molar mass of 129.839 g/mol when unhydrated. (you need to find the ratio of moles of water to moles of dry sample)
The ratio of moles of water to moles of dry sample can be found by dividing the percentage of water by 100.
The calculation of the number of water molecules in a crystal can be performed by analyzing the molar mass of the unhydrated crystal, which contains no water molecules. The ratio of moles of water to moles of dry sample can then be found by comparing the molar masses of the hydrated and unhydrated crystals.
The formula for calculating the number of water molecules in a crystal is as follows:
Percentage of water in crystal = (Molar mass of water / Molar mass of hydrate) * 100
The percentage of water in a crystal can then be used to determine the ratio of moles of water to moles of dry sample. To calculate the number of water molecules in an unknown sample, you must first determine the molar mass of the unhydrated sample. This can be done by dividing the mass of the sample by the number of moles in the sample. The mass of the sample is the sum of the masses of the dry sample and the water molecules. The molar mass of the water molecules is 18.015 g/mol.
To determine the mass of the water molecules, you must subtract the mass of the dry sample from the mass of the sample. The molar mass of the unhydrated sample can then be determined by dividing the mass of the dry sample by the number of moles in the sample. Once the molar mass of the unhydrated sample is known, the percentage of water in the sample can be calculated using the formula given above.
Finally, the ratio of moles of water to moles of dry sample can be found by dividing the percentage of water by 100.
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mesitylene is a liquid hydrocarbon. if 0.115 g of this compound is burned in pure oxygen to give 0.3790 g co2 and 0.1035 g h2o, what is the empirical formula of the compound?
The empirical formula of the compound is C3H4.
Solution:
For the simplest ratio device both moles by lowest mole.
C = 0.00864/0.00864 = 1 x 3 = 3
H = 0.0115/0.00864 = 1.33 x3 = 4
The empirical formula is = C3H4
An empirical formula is the chemical formula of a compound that indicates the proportion of elements present in the compound but does not indicate the actual number or arrangement of atoms. This will be the smallest integer ratio of the elements in the compound.
The molecular formula is the simplest formula for a compound and is defined as the ratio of the smallest possible integer exponents of the elements in the formula. Also known as the simplest formula. Pharmaceutical companies use empirical studies to test certain drugs in controlled or random groups to study effects and causes.
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A 13. 00 g sample of citric acid reacts with an excess of baking soda as shown in the equation. Upper H Subscript 3 Baseline Upper C Subscript 8 Baseline Upper H Subscript 5 Baseline Upper O Subscript 7 Baseline 3 Upper N a Upper H Upper C Upper O Subscript 3 Baseline right arrow 3 Upper C Upper O Subscript 2 Baseline 3 Upper H Subscript 2 Baseline Upper O Upper N a Subscript 3 Baseline Upper C Subscript 8 Baseline Upper H Subscript 5 Baseline Upper O Subscript 7. What is the theoretical yield of carbon dioxide? 0. 993 g 2. 98 g 3. 65 g 8. 93 g.
Answer:
The answer is C.
Explanation:
i got a 100 on the test
The theoretical yield of carbon dioxide, CO₂ obtained from the reaction is 8.93 g
We'll begin by calculating the mass of citric acid, H₃C₆H₅O₇ that reacted and the mass of carbon dioxide, CO₂ produced from the balanced equation.
H₃C₆H₅O₇ + 3NaHCO₃ —> 3CO₂ + 3H₂O + Na₃C₆H₅O₇
Molar mass of H₃C₆H₅O₇ = (3×1) + (12×6) + (5×1) + (7×16) = 192 g/mol
Mass of H₃C₆H₅O₇ from the balanced equation = 1 × 192 = 192 g
Molar mass of CO₂ = 12 + (2 × 16) = 44 g/mol
Mass of CO₂ from the balanced equation = 3 × 44 = 132 g
From the balanced equation above,
192 g of H₃C₆H₅O₇ reacted to produce 132 g of CO₂
Finally, we shall determine the theoretical yield of CO₂. This can be obtained as follow:
From the balanced equation above,
192 g of H₃C₆H₅O₇ reacted to produce 132 g of CO₂.
Therefore,
13 g of H₃C₆H₅O₇ will react to produce = (13 × 132) / 192 = 8.93 g of CO₂.
Thus, the theoretical yield of CO₂ is 8.93 g
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the number of atoms in 0.009567 mole of HBrO3 is
Avogadro's Number:
Avogadro's number, which is equal to 6.02214076 x \(10^{23}\), is the quantity of units in one mole of any material. Hence, 1 mole of HBrO3 will contain
6.02214076 x \(10^{23}\) atoms.
Then, 0.009567 mole of HBrO3 will contain
= 0.009567 moles x 6.02214076 x \(10^{23}\) atoms
= 0.0576138 x \(10^{23}\) atoms = 5.761 x \(10^{21}\) atoms.
Hence, 0.009567 mole of HBrO3 will contain 5.761 x \(10^{21}\) atoms.
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the more particles a substance has at a given temperature the more thermal energy it has true or false
Answer:
\(\huge\boxed{\sf True}\)
Explanation:
Temperature and thermal energy are in a direct proportion which means that if temperature of a substance increases, its thermal energy also increases and vice versa.
\(\rule[225]{225}{2}\)
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~AH1807What is the name of cells that have the ability to develop into different
kinds of cells?
Answer:
stem cells
Explanation:
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In test tube 3, 3 mL of .002 M Fe(III) solution is combined with 7 mL of .02 M 5-sulfosaliclic acid (SSA) solution. What is the mole fraction of SSA in the test tube
Answer:
0.96
Explanation:
Number of moles of Fe(III) = 3/1000 * 0.002 M = 6 * 10^-6 moles
Number of moles of SSA = 7/1000 * 0.02 = 1.4 * 10^-4 moles
Total number of moles = 6 * 10^-6 moles + 1.4 * 10^-4 moles
Mole fraction of SSA = number of moles of SSA/ total number of moles.
Mole fraction of SSA = 1.4 * 10^-4 moles/ 6 * 10^-6 moles + 1.4 * 10^-4 moles
Mole fraction of SSA = 0.96
Find an example of an ester used as a fragrance or flavoring and give the name, condensed structural formula, and flavor of your chosen ester.
The example of an ester used as a fragrance is isopentyl acetate and it is present in banana. Details about esters can be found below.
What are esters?Esters are compounds most often formed by the condensation of an alcohol and an acid and has the functional group carbon-oxygen double bond joined via carbon to another oxygen atom.
Esters are naturally found in certain fruits and can be used as major constituent of perfumes. An example of ester used as fragrance is isopentyl acetate.
Isopentyl acetate has the molecular formula of C7H14O2 and has a banana flavor.
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A certain mass of gas 200cm^3 at 20°C and 740mmHg. Determine the volume of the gas at STP.
Answer:
Firstly, calculate the Pressure of the gas using the Ideal Gas Law:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature.
Next, convert the units of temperature and pressure from Celsius and millimeters of mercury (mmHg) to Kelvin and atmospheres (atm), respectively.
At 20°C, the temperature in Kelvin is 293K and the pressure in atm is 0.976atm.
Now, calculate the volume of the gas at STP (standard temperature and pressure). At STP, the temperature is 273K and the pressure is 1atm.
Using the Ideal Gas Law, we can solve for the new volume:
V2 = nRT2/P2
V2 = (nRT1/P1) x (P2/T2)
V2 = 200cm^3 x (1atm/293K) x (273K/0.976atm)
V2 = 224.6cm^3
Balancing Chemical Equation
C=H2=CH4
Answer:
C + 2H2 ⇒ CH4
Explanation:
In order to balance a chemical equation you need to make sure that the number of atoms on both sides are equal
C + H2 = CH4
C = 1
H = 2
Products:
C = 1
H = 4
H2 = 2 × 2 = 4
C + 2H2 ⇒ CH4
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A student places a piece of a potato into a container of hydrogen peroxide. One observation the student makes is that bubbles form around the potato. The presence of bubbles might indicate the formation of a new substance because bubbles -.
The presence of bubbles might indicate the formation of a new substance because bubbles indicate formation of gas.
On placing the pieces of potato in a container of hydrogen peroxide will cause a chemical reaction to occur between catalase and hydrogen peroxide. The enzyme will breakdown the hydrogen peroxide into oxygen and water, where oxygen release will be evident in the form of gas bubbles.
Catalase is present in the cells to prevent oxidative damage. In plants, the enzyme plays crucial role in photorespiration. By breaking down the hydrogen peroxide, the enzyme protects the cells from oxygen radicals, that may damage the nucleic acid and other organelles.
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What is 0.00034 in exponential form
Answer:
3.4 × 10 ^− 4
Explanation:
Move the decimal so there is one non-zero digit to the left of the decimal point. The number of decimal places you move will be the exponent on the
10 . If the decimal is being moved to the right, the exponent will be negative. If the decimal is being moved to the left, the exponent will be positive.
explain the atomic radius trend periodic table?
On general basis in modern periodic table, the atomic radius decreases as we move from left to right in a period and it increases when we go down a group.
Trend-wise in modern periodic table, as we moves from left to right across a period in the modern periodic table, the ionization energy increases due to the increase in nuclear charge which results in the decrease of atomic size. Again, the decrease in the atomic size results in a more potent force of attraction between the electrons and the nucleus.
As we move down the group in the modern periodic table there is an increase in the atomic size due to the addition of an extra shell.
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The picture shows two lightbulbs powered by a solar cell. Describe the
energy transfers that make the bulbs light, starting with energy from the
Sun.*
Answer:
light energy --> electric energy ----> light and heat energy by the bulb
Explanation:
The energy transfers that make the bulbs light, starting with energy from solar energy to electrical energy and from electrical energy to heat & light energy.
What is energy transfer?Transfer of energy is a process in which one form of energy will convert into other form of energy, and total energy during this conversion is conserved. When the solar energy comes from the Sun and falls on the solar panel, then PV cells that are present in the panel will absorb this solar energy and generate electrical charge. This electrical charges are responsible for the flow of internal electricity inside the cell.This generated electricity used by the bulbs to generate light energy as well as heat energy.
Hence, Solar energy will convert in to electrical energy which in turn converts into light and heat energy.
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