In a food chain, only 10 % of energy is transferred to the next organism. True or false

Answer: 34 gram of chromium produced from 50g of \(Cr_2O_3\)

Explanation:

To calculate the moles :

\(\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}\)    

\(\text{Moles of} Cr_2O_3=\frac{50g}{152g/mol}=0.33moles\)

The decomposition of \(Cr_2O_3\) follows the equation :

\(2Cr_2O_3\rightarrow 4Cr+3O_2\)  

According to stoichiometry :

2 moles of \(Cr_2O_3\) produce = 4 moles of \(Cr\)

Thus 0.33 moles of \(Cr_2O_3\) will produce=\(\frac{4}{2}\times 0.33=0.66moles\)  of \(Cr\)

Mass of \(Cr=moles\times {\text {Molar mass}}=0.66moles\times 52g/mol=34g\)

Thus 34 gram of chromium produced from 50g of \(Cr_2O_3\)

Answer:

By the end of this module, you will be able to: ... (a) Calculate the pH of an acetate buffer that is a mixture with 0.10 M acetic acid and 0.10 M ...

Answer:

Calculate the frequency of light having wavelength of 456 nm.

1.22*10^8nm

Explanation:

In the given question, \(6.58 \times 10^{14}\) Hz is the frequency of the light with a wavelength of 456 nm.

Frequency is a measure of the number of cycles of a periodic wave that occur per unit of time.

The frequency of light can be calculated using the following equation:

frequency = speed of light / wavelength

where the speed of light is a constant equal to \(\rm 3 \times 10^8 \ m/s\).

To use this equation, we need to convert the wavelength from nanometers to meters:

456 nm = \(\rm 456 \times 10^{-9}\ m\)

Now, we can substitute the values into the equation:

frequency =  \(\rm 3 \times 10^8 \ m/s\) / \(\rm 456 \times 10^{-9}\ m\)

=  \(6.58 \times 10^{14}\) Hz

Therefore, the frequency of light with a wavelength of 456 nm is  \(6.58 \times 10^{14}\) Hz.

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Answer:

Explanation:

H+ = 1 X 10^-7.41 = 3.89 X 10^ -8

POH = 14-7.41 = 6.59

OH- = 1 x 10 ^-6.59 = 2.57 X 10^ -7

The [H+] and [OH−] concentrations of the solution are approximately 2.38 × 10^(-7) M, and the pOH is 6.59.

The pH of a solution is a measure of the concentration of hydrogen ions ([H+]) in the solution. The pH scale ranges from 0 to 14, with a pH of 7 considered neutral. A pH of 7.41 indicates that the solution is slightly basic. To calculate the [H+], [OH−], and pOH of the solution, we can use the relationship:

pH + pOH = 14

Given that the pH is 7.41, we can subtract it from 14 to find the pOH:

pOH = 14 - 7.41 = 6.59

Since pH + pOH = 14, we can also determine the [OH−] by taking the antilogarithm of the pOH value:

[OH−] = 10^(-pOH)

[OH−] = 10^(-6.59)

[OH−] ≈ 2.38 × 10^(-7) M

Since the solution is neutral, the concentration of [H+] will be equal to the concentration of [OH−]:

[H+] = [OH−] ≈ 2.38 × 10^(-7) M

Therefore, the [H+] and [OH−] concentrations of the solution are approximately 2.38 × 10^(-7) M, and the pOH is 6.59.

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Answer:

Eutrophication

Explanation:

Eutrophication results when there is excess levels of phosphates and nitrates in its water of lake.

When there is high level of nutrition level in the water body of lake, then the productivity of water plants increases thereby leading to algal boom and hence Eutrophication.

The SI unit to the quantity it measures are:

Mass: The mass of an object is a measure of its amount of matter. The SI unit of mass is the kilogram (kg) or gram (g).

Temperature: Temperature is a measure of the average kinetic energy of the particles in a substance. The SI unit of temperature is the kelvin (K).

Time: Time is a measure of the interval between two events. The SI unit of time is the second (s).

Electric current: Electric current is a measure of the flow of electric charge. The SI unit of electric current is the ampere (A).

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Complete question:

Drag the tiles to the correct boxes to complete the pairs. Not all tiles will be used.

Match each SI unit to the quantity it measures.

Phan

convex

concave

duplex

Hi there! Answer is below :)

Explanation:

For this question, we apply Boyle's Law and Charles' Law.

When you double the amount of pressure and temperature of a compound or mixture, the volume will decrease by a half. So, if the pressure and temperature are 2, and the volume is 1, and you double, your volume will be 0.5 and your pressure and temperature will be 4.

Best of Luck!

Ga3+ do not have the ground state electron configuration of a noble gas.

electron configuration:

The arrangement of electrons in the atomic orbitals of an atom is called the electron configuration.

Noble gases have completely filled orbitals and belongs to group 18 which has outermost electronic configuration of ns2np6, where n is highest shell/period.

Ca2+ has an electronic configuration of [Ar]

Cl- has an electronic configuration of [Ar]

H- has an electronic configuration of [He]

Al3+ has an electronic configuration of [Ne]

Ga3+ has an electronic configuration of [Ar]d10

since, ga3+ has outermost electrons in its d subshell so, it do not have the ground state electron configuration of a noble gas.

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Answer

mass of CO2 required = 60.5 g

Explanation

Given:

Molar mass of CO2 = 44 g/mol

Molar mass of O2 = 32 g/mol

Mass of O2 = 22 g

Required: Mass of CO2 needed to produce O2

Solution:

Step 1: Calculate the moles of O2

n = m/M where n is the moles, m is the mass and M is the molar mass

n = 22g/32g/mol

n = 0.6875 mol

Step 2: Find the moles of CO2 using stoichiometry

Molar ratio between CO2 and O2 is 2:1

Therefore moles of CO2 = 0.6875 mol x 2 = 1.375 mol

Step 3: Covert the moles of CO2 to mass

m = n x M

m = 1.375 mol x 44 g/mol

m = 60.5 g

This archipelago and its enormous marine reserve are referred to be a "living museum and showcase of evolution" for their singularity.

Thus, The 127 islands, islets, and rocks that make up the Galapagos archipelago, 19 of which are major and 4 of which are inhabited, are located roughly 1,000 kilometres from the Ecuadorian mainland. In 1959, national parks were established on 7,665,100 ha, or 97% of the entire emergent surface.

On the remaining three percent of the islands, only human habitation is permitted in designated rural and urban zones (the fifth island only includes an airport, a tourist dock, a fuel containment system, and military installations).

The Galapagos Marine Reserve, one of the largest marine reserves in the world, was established in 1986 and expanded to its current area in 1998. It surrounds the islands. Inland waters of the archipelago are also a part of the marine reserve.

Thus, This archipelago and its enormous marine reserve are referred to be a "living museum and showcase of evolution" for their singularity.

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Given that the T. rex was extinct 65 million years ago, this period of time is comparably brief, and we do not anticipate the carbon-14 in the fossil to have gone through 15,000 half-lives.

To reduce a drug's concentration by 95% to 97%, it takes four to five half-lives. the time frame of the drug's activity. The longer the half-life of the medicine, the longer its plasma concentration will remain above the minimum effective concentration.

The formula t = (t1/2) x (log N0/Nt) can be used to compute the amount of time needed for 15,000 half-lives to occur.

We can estimate the amount of time needed for 15,000 half-lives to occur as follows:

t = (5,700 years) x (log 1/1x10⁻¹²)

t ≈ 82,000 years

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Based on the Law of Conservation of Mass, the mass of products form when baking soda decomposes is 168 g/mole.

The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change, so quantity can neither be added nor be removed.

From the equation of NaHCO3 → Na₂CO3 + H₂O + CO₂ , we have

Mass of baking soda = 2 x molar mass

Molar mass of NaHCO₃ = 84.007 g/mole

Mass of baking soda = 2 x 84.007 g/mole

Mass of baking soda =  168.014 g/mole=  168 g/mole

Therefore, based on the Law of Conservation of Mass, the mass of products form when baking soda decomposes is 168 g/mole.

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The Sun rotates at different rates at different latitudes on the Sun

The sun revolves around its axis like a ball in motion. One cycle of the sun takes approximately 27 days. But the sun rotates at various rates in various parts. The sun's equator rotates more quickly than its poles. Differential rotation is the name given to this phenomena.

The depth of the sun also affects how quickly it rotates, with the core regions rotating more slowly than the outer regions.

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Missing parts;

Which statement about the Sun's rotation is TRUE?

The Sun rotates only at the equator, where the sunspots are found; the rest of the Sun does not rotate

Only the atmosphere of the Sun rotates, not the main body of the Sun

The Sun rotates at different rates at different latitudes on the Sun

The Sun rotates once a day

The Sun does not rotate; only planets rotate

The volume of the alcohol would be in 200 mL of the solution is equal to 50 ml.

The concentration of the given solution can be explained in the terms of molarity, molality, and Normality. We can easily calculate the molar concentration of a substance in a solution.

In chemistry, concentration can be defined as the abundance of components divided by the total volume of a mixture.

The percent by volume of a solution can be calculated as the ratio volume of alcohol and the total volume of the solution.

The percent by volume = volume of alcohol / Total volume of solution

Given the total volume of the solution, = 200 ml

The  percent by volume  = 25 %

25 % =  volume of alcohol / 200

The volume of alcohol  = (25/100) × 200

Volume of alcohol  = 50 ml

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2.73 atm is the pressure in the vessel. Hence, option B is correct.

The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).

PV=nRT, where n is the moles and R is the gas constant. Then divide the given mass by the number of moles to get molar mass.

Given data:

P= ?

V= 25.1 L

\(n= \frac{m}{molar \;mass \;of \;nitrogen} + \frac{m}{molar \;mass \;of \;hydrogen } +\frac{m}{molar \;mass \;of \;argon}\)

\(n= \frac{2.80 g}{14} + \frac{0.605 g}{1} +\frac{79.9 g}{40}\)

n= 2.8025

R= \(0.082057338 \;L \;atm \;K^{-1}mol^{-1}\)

T=25°C + 273= 298 K

Putting value in the given equation:

\(\frac{PV}{RT}=n\)

\(2.8025 = \frac{P\; X \;25.1 \;L}{0.082057338 \;L \;atm \;K^{-1}mol^{-1} X 298}\)

P = 2.73 atm

2.73 atm is the pressure in the vessel. Hence, option B is correct.

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By -320 pM, we need to increase the source power. A fluorescent material begins to produce visible light when energy is absorbed as a result of the incidence of X-rays, light waves, and electrons.

When a substance generates electromagnetic waves inside the longer wavelength range and makes them visible to the human eye, it is a fascinating occurrence. Let's first define fluorescence in order to comprehend this. This allows the substance to gently transition from the partly excited state to the ground state. Fluorescence is the term for this phenomena.

Detection limit = 3 × noise / signal to noise ratio

Detection limit  = 3× 75 pM / 5 = 15 pM

Source power = (noise / desired detection limit)² × current source power

Source power = (15 pM / 75 pM)² ×500 pM

                      = 0.36 ×500 pM

                       = 180 pM

Source power= 180 pM - 500 pM =

                       =-320 pM

Therefore, -320 pM, we need to increase the source power.

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The number of moles of products based on the information given is 0.5 moles product.

It is given that each unshaded sphere represents an atom A and shaded represents B. If we look at the diagram, we have 8 unshaded doubly attached units and 4 unshaded doubly attached units on the left side which means we have 8 A2 molecules that react with 4 B2 molecules.

Whereas in the right-side diagram(which are products), 4 molecules have 4 unshaded and one shaded sphere, which means it is BA4 and 2 moles have two shaded spheres which mean it is B2. Hence, the number of moles of products based on the information given is 0.5 moles product.

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Answer:

Option D

Explanation:

The switch safely opens and closes the circuit

Answer:

the answer is d.) potassium

Explanation:

Answer:

I'd say it's the first option, A study that follows people for an extended period of time to see if they develop a disease or condition.

Explanation:

A leather jacket and printer paper are examples of items that can be made from renewable resources, while plastic forks, metal cans, and electronics are not considered renewable due to their reliance on non-renewable materials and processes. Option  C, E

The two correct answers that are made from renewable resources are:

C) Leather jacket: Leather is derived from animal hides, which are a byproduct of the meat industry. As long as there is a sustainable and responsible approach to animal farming, the production of leather can be considered renewable. The hides are obtained from animals that are raised for meat consumption, and their use in leather production helps reduce waste.

E) Printer paper: Printer paper can be made from various sources, including trees, bamboo, and recycled paper fibers. If the paper is sourced from sustainably managed forests or from fast-growing plants like bamboo, it can be considered renewable. Additionally, the use of recycled paper fibers reduces the demand for materials and promotes a more circular economy.

The other options, A) plastic fork, B) metal can, and D) electronics, are not made from renewable resources:

A) Plastic fork: Plastics are typically derived from fossil fuels, which are non-renewable resources. The production of plastic involves the extraction and processing of petroleum or natural gas, both of which are finite resources.

B) Metal can: Metal cans are predominantly made from aluminum or steel. While these metals can be recycled, their initial production requires the extraction of raw materials from the Earth, which is not a renewable process.

D) Electronics: Electronics are made from a wide range of materials, including metals, plastics, and various chemical compounds. The production of electronics involves the extraction of raw materials, many of which are non-renewable resources.

Option C and E.

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Taking into account the reaction stoichiometry and the definition of theoretical yield,  the theoretical yield of bromobenzene is 58.33 grams.

In first place, the balanced reaction is:

C₆H₆ + Br₂ → C₆H₅Br + HBr

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 159.8 grams of Br₂ reacts with 78 grams of C₆H₆, 62.8 grams of Br₂ reacts with how much mass of C₆H₆?

mass of C₆H₆= (62.8 grams of Br₂× 78 grams of C₆H₆) ÷159.8 grams of Br₂

mass of C₆H₆= 30.65 grams

But 30.65 grams of C₆H₆ are not available, 29 grams are available. Since you have less mass than you need to react with 62.8 grams of Br₂, C₆H₆ will be the limiting reagent.

The theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product, that is, it is the maximum amount of product that could be formed from the given amounts of reagents.

Considering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 78 grams of C₆H₆ form 156.9 grams of C₆H₅Br, 29 grams of C₆H₆ form how much mass of C₆H₅Br?

mass of C₆H₅Br= (29 grams of C₆H₆× 156.9 grams of C₆H₅Br)÷ 78 grams of C₆H₆

mass of C₆H₅Br= 58.33 grams

Finally, the theoretical yield of bromobenzene is 58.33 grams.

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The properties of a natural resource that make it useful for humans as a material or energy source is the ability to convert mass into energy and vice versa.

The expression natural resources make reference to all types of matter and energy extracted from nature that can be used to produce goods and services.

Some examples of natural resources include for example irreversible resources such as fossil fuels (i.e., oil, or coal, gas, minerals such as metals, rocks, etc) as well as those based on the use of reversible energy such as eolic air energy, solar radiation or sunlight, soil and hydric resources or water.

Therefore, with this data, we can see that natural resources can be defined as any material and or energy obtained from nature that may be irreversible or reversibly used to produce goods and services.

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Answer:

Hello, I was doing this and from my caluclations it should be :

Explanation:

3 Moles.

The three moles of MgCO3 are present in 252.939 grams of MgCO3.

So, option B is correct one .

The molar mass of substance is equal to mass of one mole of  that substance.

Example: Molar mass of MgCO3 is equal to mass of one mole of MgCO3.

Molar mass of Mg = 24.305 u

Molar mass of C = 12.011 u

Molar mass of O = 15.999 u

Molar mass of MgCO3 = Molar mass of Mg + Molar mass of C + Molar mass of O*3

Molar mass of MgCO3 = 24.305 + 12.011  +  15.999 * 3

Molar mass of MgCO3 = 84.3139 gram

Molar mass of  MgCO3 contain  84.3139 gram

So, 252.939 grams of MgCO3 = 252.939 grams/84.3139 gram

252.939 grams of MgCO3 = 2.999 moles

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Answer:

mesosphere

Explanation:

The coldest layer of the atmosphere is known as the mesosphere.

The layers of the atmosphere have the coldest temperatures is mesosphere. Therefore, option B is correct.

The third layer of the atmosphere, the mesosphere, is situated just above the stratosphere and under the thermosphere. As altitude rises, temperature drops in the mesosphere.

The third of the five layers that make up the Earth's atmosphere, the mesosphere, is located between the thermosphere and the stratosphere.

It is distinguished by a temperature that drops with altitude, becoming the coldest region of the entire atmosphere at a minimum of around 55 miles above the surface.

The coldest part of the Earth's atmosphere is the top of the mesosphere, where temperatures can locally drop as low as 100 K (-173°C).

Thus, option B is correct.

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The property described by each statement is as follows:

Intensive property is the property of a material that does not depend on the amount or shape of the material.

On the other hand, extensive property is the property of a component or system that is a function of the whole component, a property that changes if material is added or subtracted to the component.

Examples of intensive properties are;

Examples of extensive property are;

Therefore, the property described by each statement is as follows:

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Answer:

ethyl ethernal

Explanation:

no explanation

1 and 3. Option B is correct.

Covalent bonding between elements involves the sharing of electrons among the elements in order for the elements to have a complete shell. These electron pairs are known as shared pairs, and this stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.

The individual element with the given electronic structures are;

• Element 1 = Hydrogen

• Element 2 = Lithium

• Element 3 = Nitrogen

• Element 4 = Magnessium

•

From the elements listed, only Nitrogen and Hydrogen have the tendency to form a covalent compound. The electron in the outermost shell of hydrogen is shared with the nitrogen element to produce the ―NH compound whose electrons it shared unequally.

The high electron affinity of hydrogen makes the hydrogen to take on a slight positive charge.