The energy released when electron move from n=4 to n=3 is 0.66 eV
We know that in an atom energy of nth state is
[tex]E_n = -13.6/n^{2}[/tex] eV
where n is the energy level
Therefore,
[tex]E_4 = -13.6/4^{2} \\E_3 = -13.6/3^{2}[/tex]
Thus, [tex]E_4[/tex] = -0.85eV
[tex]E_3[/tex] = -1.51eV
Therefore, total mount of energy released in moving electron from n=4 to n=3 is given by -
[tex]E_4 -E_3[/tex]
= -0.85 - ( -1.51)
= 0.66eV
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A graduated cylinder is filled 10.10 mL with water and a piece of granite is placed in the cylinder, displacing the level to 19.45 mL. What is the volume of the granite piece in mL?
The volume of the granite piece in milliliters if a graduated cylinder is filled 10.10 mL with water and a piece of granite is placed in the cylinder, displacing the level to 19.45 mL is 9.35mL.
How to calculate volume?Volume of a substance refers to the amount of that substance in a container. The volume is measured in litres (L), which can be converted to milliliters (mL) as follows:
1 Litre = 1000 milliliters
According to this question, a graduated cylinder is filled 10.10 mL with water and a piece of granite is placed in the cylinder, displacing the level to 19.45 mL.
This means that the volume the granite occupies is as follows:
Volume of granite = 19.45mL - 10.10mL = 9.35mL
Therefore, the volume of the granite piece in milliliters if a graduated cylinder is filled 10.10 mL with water and a piece of granite is placed in the cylinder, displacing the level to 19.45 mL is 9.35mL.
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What is the forward rate with continuous compounding for a three-month period starting in one year?
Answer:8.7%
Explanation:
The forward rate for a three-month period starting in one year is 11.36% per annum.
The forward rate for a specific time period represents the interest rate for borrowing or lending money during that period in the future.
Let's denote:
[tex]r_1[/tex] = Spot rate for one year (annual rate)
[tex]r_2[/tex] = Spot rate for one year and three months (annual rate)
The formula for the forward rate with continuous compounding is given by:
[tex]\[ F = \frac{e^{(r2 * t2)} - e^{(r1 * t1)}}{t2 - t1} \][/tex]
where:
F is the forward rate
[tex]t_1[/tex] is the starting time in years (one year)
[tex]t_2[/tex] is the ending time in years (one year and three months)
Substituting the value
[tex]\[ r_1 = 9.5\% \\r_1 = 0.095)[/tex]
[tex]r_2 = 0.096\\\[ t1 = 1 \text{ year} \][/tex]
[tex]\[ t2 = 1 + \frac{3}{12}[/tex] = 1.25 year back to the formula as
[tex]\[ F = \frac{e^{(0.096 * 1.25)} - e^{(0.095 * 1)}}{1.25 - 1} \][/tex]
[tex]\[ F = \frac{e^{0.12} - e^{0.095}}{0.25} \][/tex]
[tex]\[ F = \dfrac{1.1275 - 1.0991}{0.25} \][/tex]
[tex]\[ F= \dfrac{0.0284}{0.25} \][/tex]
F= 0.1136
Now, convert the forward rate back to percentage:
Forward rate (F) ≈ 0.1136 * 100% = 11.36%
So, the forward rate is 11.36% per annum.
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The missing table attached at the end.
What does dissolved carbon dioxide in the ocean produce?
a. hydrogen ions
b. algae
c. oxygen
d. nitrous oxide
Option A. Hydrogen Ions
The dissolution of carbon dioxide in the oceans produce hydrogen ions as when carbon dioxide is dissolved in the ocean it leads to Ocean Acidification. This Acidification produces the hydronium ions as more acidic nature implies higher concentrations of hydrogen ions.
Carbon dioxide is a gas that readily dissolves in water to give Carbonic Acid , bicarbonate ions and carbonate ions , all of which are acidic in nature. This lowers the pH of the ocean making the waters more acidic. Therefore the acidity of oceans is largely dependent on carbon compounds and the amount of Carbon dioxide.
The reaction of Carbon dioxide with water to give carbonic acid :
CO2 + H2O → H2CO3
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4. Manik saw his father watering his garden plants in hot weather. He noticed that
water doesn’t stick to the plant leaves and leaves become dry but looked fresh. He asked
following questions to his teacher
a. Which tissue forms the outer covering of a plant and does it have a protective role
to play?How ?
b. Why does water not stick to the leaves?
Water does not stick to the leaves of the plant owing to the fact that the leaves has a waterproof cuticle.
What tissues protects the leaves?We know that the leaves are the parts of the plant that are involved in photosynthesis. Photosynthesis is the process by which green plants produce their own food in the presence of sunlight and chlorophyll. We know that the leave has an outer protective covering.
The tissue that plays this outer covering of a plant for is the epidermis and its waxy cuticle. It prevents damage to the plant.
Water does not stick to the leaves of the plant owing to the fact that the leaves has a waterproof cuticle.
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if anyone sees this can they help out?
Examine the table for the densities of various substances above. If a student has an unknown substance with a mass of 51.3 g and a volume of 4.5 ml. A milliliter is equivalent to a cubic centimeter. Which statements can be supported by the information given here? Select ALL that apply.
A The substance is likely nickel.
B The substance is likely gold.
C The substance will float in water.
D The substance will sink in water.
E The substance is likely lead.
Answer:
The answers are is that they are likely lead and the substance will sink in water.
Explanation:
First of you have the formula Density=Mass/volume
I substituted 51.4 for mass and 4.5 for volume and divided it to get 11.4. According to the table Lead has 11.4 density. Then once you got that you redo the formula and the substance will most likely sink because it has more than 1 g/cm^3.
Hope this helps!
Also I did it on USA Test Prep c:
Which option correctly identify a type of mixture?
a. Homogeneous mixtures have parts that are distributed unevenly.
b. Homogeneous mixtures have parts that are distributed evenly.
c. Heterogeneous mixtures have parts that are distributed unevenly.
d. Heterogeneous mixtures have parts that are distributed evenly.
The statement that correctly identifies the type of mixture is that homogeneous mixtures have parts that are distributed evenly. The correct option is c.
What is homogenous mixture?A homogeneous mixture is sole in which the composition is consistent throughout the solution.
Since the dissolved salt is evenly distributed throughout the salt water sample, the salt water described as an illustration is homogeneous.
The statement that accurately defines the type of mixture is that homogeneous mixtures have evenly distributed parts.
Thus, the correct option is c.
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Which combinations of single and double bonds are possible around a carbon atom?
Two Single and One Double Covalent Bond are possible around a carbon atom. After the hydrogen, helium, and oxygen, carbon is the fourth most prevalent element in the universe by mass and the fifteenth most abundant element in the crust of the Earth.
Carbon can be considered a common component of all known life due to its abundance, distinctive diversity of organic compounds Bond and exceptional capacity to build polymers at Earth's typical temperatures. After oxygen, it makes up around 18.5% of the total mass of the human body. The allotropic form of carbon exhibits a wide range of physical properties.
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why is lightning categorized as plasma? A. It consists of tightly packed particles B. it has a definite volume. C. it has no definite shape D. it has extremely high levels of energy
Lightning is categorized as plasma because it has extremely high levels of energy.
When the electrons are freed from their host atoms for a short time, due to high temperatures, it is plasma. An electrical discharge consisting of moving electrons and ions, is lightning. Lightning strikes create plasma via a very strong jolt of electricity.
By the passage of electricity through a gas, the plasma was created. An electrical discharge through air and it ionizes the atoms when this happens. The electrons from the atoms strips and leaves positively charged ions in the gas, is lightning.
Lightning as an example of plasma present at Earth's surface. Plasma temperatures approaches 30000 K and electron densities may exceed 10²⁴ m−³.
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Gold was mined in California and divided into 1.5 kg pieces. Each piece of gold was a perfect 8.1 cm tall. What was the density of the gold?
The density of the gold will be 2.82 g/ [tex]cm^3[/tex].
What is density?The density of a substance is the ratio of the mass of the substance and its volume.
Mathematically, density = mass/volume
In this case; mass of gold = 1.5 kg or 1500 g, height of gold = 8.1 cm
Being a perfect 8.1 cm tall means the gold is a cube.
Volume of a cube = [tex]l^3[/tex]
Volume of gold = 8.1 x 8.1 x 8.1
= 531.441 [tex]cm^3[/tex]
Thus; density of gold = 1500/531.441
= 2.82 g/ [tex]cm^3[/tex]
The density of the gold is, therefore, 2.82 g/ [tex]cm^3[/tex].
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Classify these amino acids as acidic, basic, neutral polar, or neutral nonpolar. drag each item to the appropriate bin.
The classification is:
Basic: ArginineNeutral polar: GlutamineNeutral nonpolar: AlanineOrganic substances known as amino acids have both amino and carboxylic acid functional groups. Only 22 of the hundreds of amino acids found in nature are alpha amino acids, which are by far the most common and make up proteins. Only 22 alpha amino acids are found in the genetic code. Alpha-, beta-, gamma-, or delta-amino acids can be categorized according to where the main structural functional groups are located; further classifications relate to polarity, ionization, and the kind of side chain group (aliphatic, acyclic, aromatic, containing hydroxyl or sulfur, etc.). Amino acid residues are the second-largest component of human muscles and other tissues, behind water, in the form of proteins.
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An unknown substance has a density of 2.5g/ml. is this a physical or
chemical property? how do you know?
1 point
density is a chemical property because every substance has a unique density that we
can use to identify it.
density is a physical property because we can find it for a substance without
changing the identity of the substance.
o density is a chemical property because all chemicals have a density.
o density is a physical property because we can measure it.
An unknown substance has a density of 2.5g/ml. Density is a physical property because we can find it for a substance without changing the identity of the substance. The correct option is B.
What are physical properties?Physical properties are those properties that can be seen by seeing the matter of the object. Density is a physical property. It does not depend upon the chemical composition of the object.
Thus, the correct option is B. Density is a physical property because we can find it for a substance without changing the identity of the substance.
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Most elements are metals. What is a
physical property of metals?
A. They conduct heat.
B. They are man-made.
C. They float in water.
Answer:
A. They conduct heat.
Explanation:
The chemical released by the synaptic vesicles of neurons during synaptic transmission is called:___.
Answer:
a neurotransmitter
Explanation:
6. the molecular weight of potassium chloride (kcl) is 74.55 g/mol. how many grams would you need for 650 ml of a 35 mm solution?
Mass of potassium chloride (KCl) is 1.7 grams.
M(KCl) = 74.55 g/mol; molar mass of potassium chloride
V(KCl) = 650 ml = 0.65 l; volume of potassium chloride solution
c(KCl) = 35 mM = 0.035 M; concentration of potassium chloride solution
m(KCl) = c(KCl) × V(KCl) × M(KCl)
m(KCl) = 0.035 M × 0.65 l × 74.55 g/mol
m(KCl) = 1.7 g; mass of potassium chloride
Potassium chloride (KCl) is a salt with ionic bond.
Molecular weight is the sum of the atomic weight values of the atoms in a molecule.
The concentration is the amount of solute that has been dissolved in a given amount solution.
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What organelle surrounds and supports plant cells to give them support and structure?
Group of answer choices
Cell Wall
Nucleus
Cell membrane
Answer:Cell membrane
Explanation:Plant cells don’t have cell wall
Complete each row of the table below by filling in the missing prefix or missing exponent.
The metric prefixes are a follows;
1 ng = 10^-9 g1 dg = 10^-10 g1μg = 10^-6 g1Mg = 10^6 gWhat are metric prefixes?The SI unit is the international system for the measurement of quantities. We know that the SI system is based on the metric system. The metric system has the units meter, gram and seconds as part of it.
Sometimes we use prefixes to show the magnitude of quantities when we are using the metric system. Let us now try to find the correct prefix or power in the following cases;
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Florence is only able to find 0. 015 m aqueous ki/i2 on the reagent cart, so they perform a dilution by combining 10 ml of water and 10 ml of the available reagent. They now have 0. 0075 m aqueous ki/i2 which can be used at station c. Is there a difference in the chemical composition of the solution florence made from what was available on the reagent cart?.
Florence is only able to find 0. 015 m aqueous ki/i2 on the reagent cart, so they perform a dilution by combining 10 ml of water and 10 ml of the available reagent. They now have 0. 0075 m aqueous ki/i2 which can be used at station there is no difference in the chemical composition of the solution because water was already present in the solution.
Florence is a type of flask used as an item of laboratory glassware and is named after the city Florence. here Florence flask is only able to find 0. 015 m aqueous Ki/i2 on the reagent cart they perform a dilution by combining 10 ml of water and 10 ml of the available reagent They now have 0. 0075 m aqueous Ki/i2 which can be used at station there is no difference because water was already present in the solution water is only present on the reagent cart.
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If the recommended daily allowance (RDA) for vitamin C is 60 mg per day and there are 70 mg of vitamin C per 100 g of orange, how many 3 oz. oranges would you have to eat each week to meet this requirement?
Please help, I'm terrible with Dimensional Analysis!!
The number of oranges to be eaten each week to meet the requirement is 7.
How are the RDA calculations done?
Mass of vitamin C is 70 mg.That is it is equal to 0.070 g.
as 1 mg=1×10[tex]^-3[/tex] g. And 60 mg is equal to 0.060 g according to this conversion.
The mass of orange in ounces is given as 3 oz.
As 1 oz=28.3495 g.Therefore,3 oz=(3×28.3495)g
which is equal to 85.045 g.
Given that 100 g orange has 0.070 g of vitamin C.Mass of vitamin C in 85.045 g of oranges is,
0.070/100×85.045=0.0595 g
Vitamin C consumed in 1 day is 0.060 g. Therefore in a week vitamin C consumed is 7×0.060=0.42 g.
To calculate the number of oranges to be eaten in a week it is calculated as,
Number of oranges=mass of vitamin C consumed in a week /mass of 3 oz oranges
Number of oranges=0.42 g/0.0595 g
=7.05≈7
Therefore,number of oranges to be eaten in a week are 7.
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3. Which of the following is not an example of acceleration?
a. A car coming to a stop at a stoplight.
b. An avalanche increasing speed down the side of a mountain.
c. A cheetah running at a constant speed on a hunt.
d. A jet making a sharp turn in an air show.
Answer:
C: The Cheetah running at a constant speed.
Explanation:
Acceleration can be defined as:
1: A decrease in speed
2: An increase in speed
3: A change in direction.
The cheetah is the only object that does not meet any criteria for acceleration.
The example that is not an example of acceleration is a cheetah running at a constant speed on a hunt. The correct option is option (c).
Acceleration refers to a change in velocity, either in magnitude or direction. In the case of the cheetah running at a constant speed, there is no change in velocity, so there is no acceleration.
The cheetah maintains a steady speed, there is no change in velocity hence, it is not accelerating.
Therefore, a cheetah runs at a constant speed on a hunt. The correct option is option (c).
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What concentration gradients are established and maintained by the sodium-potassium exchange pump?.
The concentration of sodium is high outside the cell (extracellular fluid) and the concentration of potassium is high inside the cell (cytoplasm).
Potassium is important for keeping the body hydrated and with sodium support cellular function (sodium-potassium (Na⁺/K⁺) pump).
The sodium-potassium pump releases three Na+ ions, while in the same time two K+ ions exit the cell. For this process one molecule of ATP is consumed.
The sodium and potassium cations move against the concentration gradients.
The sodium-potassium pump keeps a higher concentration of sodium extracellularly and a higher level of potassium intracellularly.
It is very important for many physiological processes in organism.
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identify the properly written and balanced equation for the precipitation reaction between potassium phosphate and magnesium sulfate.
Balanced equation for the precipitation reaction between potassium phosphate and magnesium sulfate:
2K₃PO₄(aq) + 3MgSO₄ → Mg₃(PO₄)₂ + 3K₂SO₄
K₃PO₄ is the salt potassium phosphate, it is soluble in water
MgSO₄ is the salt magnesium sulfate
Mg₃(PO₄)₂ is the insoluble salt magnesium phosphate, it forms precipate in this reaction
K₂SO₄ is the salt potassium sulphate, it is soluble in water
In a precipitation reaction substances react to form one or more solid products (in this example magnesium phosphate).
This chemical reaction is double displacement reaction - cations and anions of the two reactants switch places and form two new compounds.
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Most body water intake is from __________, whereas most body water lost is via __________.
Most body water intake is from drinking, whereas most body water lost is via ; urine.
Where is most of the water of the body found ?
Most body water is found within the extracellular fluid. the 2 major forces that result in the movement of water are fluid pressure and osmotic pressure. In ECF , the main cation is potassium, and therefore the major anions are chloride and bicarbonate.
How does water get distributed within the body?
The water we drink is absorbed by the intestines, and circulated throughout the body within the form of body fluids such as blood. These perform various functions that keep us alive. They deliver oxygen and nutrients to the cells, and remove waste materials, which are then eliminated with urination.
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The molecular weight of ethanol ( c2h5oh ), the alcohol in alcoholic beverages, is ________ amu (rounded to one decimal place). 46.1 45.1 9.0 29.0 26.0
The molecular weight of ethanol, in the alcohol in alcoholic beverage, is 46.1 amu.
What is ethanol?
Ethanol is a substance derived from organic compounds. With the chemical formula C2H6O, it is an alcohol. EtOH, its chemical name, is also occasionally abbreviated as CH3CH2OH or C2H5OH. Alcohol is a highly flammable, colorless liquid with a strong wine-like odor and astringent flavor.
Pharmaceuticals, polymers, lacquers, polishes, plasticizers, and cosmetics are all made with ethanol. Ethanol is used in medicine as an antidote for methanol or ethylene glycol intoxication as well as a topical anti-infective.
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Does the water testing protocol described in the lab manual involve serial dilution? justify your answer
Adding different amounts of contaminated water to each tube rather than diluting between tubes. Frequently, county health agencies will assist you with nitrate or bacteria testing. If not, you can ask a state-approved laboratory to test your water. Call the Safe Drinking Water Hotline at 800-426-4791 to locate one in your region.
Tests of the water's quality will reveal information on the condition of the river. The quality of the water might fluctuate over time, and this can be noticed by testing tubes it repeatedly. Temperature, pH, turbidity, salinity, nitrates, and phosphates are just a few of the variables that can be measured.
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A solution has been prepared with 100 g of drug in 1,000 ml solution. how many mg of drug are in 120 ml of the solution?
A solution has been prepared with 100 g of drug in 1,000 ml solution mg of drug are in 120 ml of the solution is 12000 mg
1,000 ml solution requires =100g of drug;
1 ml solution requires =100÷1000 g of drug;
= 0.1g of drug;
120 ml solution requires =0.1×120g of drug;
= 12g of drug;
= 12000 mg of drug;
The present clinical use of H2O2 continues to be constrained to the elimination of microbial infection and every now and then hemostasis, better information in the direction of the sterilization ability and cell behavior regulatory characteristic of H2O2 inside wounds will decorate the ability to exogenously augment and control recovery.
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Select the correct mass for each of the samples described below.
8.32 × 10^20 formula units CaBr2
Answer:
Explanation:
To determine the mass of each compound, we need to convert them into units of moles first. We use avogadros number to do this and use the molar mass of the compounds to convert to mass.
3.01 × 1023 molecules H2O ( 1 mole / 6.022x10^23 kg) (18.02 g / 1 mole) = 9.01 g
8.32 × 1020 formula units CaBr2 ( 1 mole / 6.022x10^23 kg) (199.89 g / 1 mole) = 0.28 g
1.93 × 1026 molecules XeF6 ( 1 mole / 6.022x10^23 kg) (245.28 g / 1 mole) = 78610.16 g
7. convert 22.7g to μg
The 22.7 g in μg ( micro gram ) is 22.7 × [tex]10^{-6}[/tex] .
We need to convert between units in order to ensure accuracy and prevent measurement misinterpretation.
For example , we do not measure a pencil's length in kilometers . In this situation , one must convert from kilometers ( km ) to centimeters ( cm ) . In most cases, multiplicative conversion factors are used to convert one unit to another of the same quantity .
Sometimes the units of measurement used may not correspond to the standards required for a particular process or application, as well as the measuring choice and convenience. The mass of object in micro gram unit is less than gram .
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A solution with ph 4 has __________ the h concentration of a solution with ph 8.
A solution with ph 4 has 10000 times the h concentration of a solution with ph 8.
the solution, in chemistry, is a homogeneous mixture of two or more substances whose relative amounts can be varied continuously up to the so-called solubility limit. The term solution is usually applied to the liquid state of aggregation, but gaseous and solid solutions are also possible. Hypotonic, isotonic, and hypertonic solutions (tonic).
A solution is a homogeneous mixture of two or more components with particle sizes less than 1 nm. Common examples of solutions are the sugar in water and salt in water, soda water, etc. In solution, all components appear as a single phase.
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10. Stephen is worried he has a fever. His dad is a scientist though, and only has a thermometer
that measures in Kelvin, and it measures Stephen's temperature to be 312 Kelvin. If Stephen's
temperature is above 100°F, he isn't allowed to go to school. Can Stephen go to school today?
Energy-requiring reactions can occur in biological systems because they can be coupled with reactions that are?
Energy-requiring reactions can occur in biological systems because they can be coupled with reactions that are exergonic reaction.
In chemical thermodynamics, an exergonic reaction is a chemical reaction where the conversion in the free energy is negative (there is a net allow to leave of free energy). This shows a unbidden reaction if the structure is closed and starting and final temperatures are the similar.
Formula of exergonic reaction :
∆G = Gproducts - Greactants
where
∆G = change in free energy
G-products = free energy of products
G-reactants = free energy of reactants
Now, it can understood that "Energy - requiring reactions can occur in biological systems because they can be coupled with reactions that are exergonic reactions."
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