The density of methanol, a colorless organic liquid used a solvent, is 0.7918 g/mL. Calculate the mass of 89.9 mL of the liquid

Answer:

Forests prevent desertification.

Explanation:

Answer:

sorry but we can't answer without the  pic

Explanation:

Answer:

pH = - log [H3O+]     pOH = -log[OH-]

Explanation:

Answer:

D

Explanation:

Luck

In an ecosystem, the difference in eye color among the same species is called variation.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.There are different  ecosystems present in the environment.

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Answer:

Mammals do not have instincts, so they must learn all their behaviors from their parents in order to survive.

Sea turtles must survive on their own, while mammals spend time with their parents and learn how to survive as they grow.

Sea turtles are less intelligent than mammals and, thus, cannot learn new behaviors from their parents.

Explanation:

Sea turtles rely on instincts more than mammals do, beacuse to get food for their survival.

Insticts are the natural impulse or motivation which are present from the inborn time to perform some functions in order to react in some specific external stimuli.

Mammals do not react impulsively in any external conditions because they have members or friends from their famliy side, who will teach them how to behave or react. But turtles didn't have that special person, so they do work rely on instincts to get food or many other purposes.

Hence, to survive sea turtles rely on instincts more than mammals do.

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A Radius =  0.025 m, B Number of moles =  2.662×10−8 mol, C r = √(Surface Area / (22π)), D Area covered = 0.001778863 \(m^2\) . To calculate the thickness of the monolayer, we need to know the volume of the monolayer and the surface area it covers.

We are given the volume of the monolayer, which is 7.43×10−6 mL . The surface area covered by the monolayer can be calculated by dividing the volume by the diameter of the watch glass, which is 5 cm or 0.05 m.

Surface area = Volume/Diameter = (7.43×10−6 mL) / (0.05 m) = 1.486×10−7 m²

The thickness of the monolayer can then be calculated by dividing the volume of the monolayer by the surface area it covers.

Thickness of monolayer = Volume / Surface area = (7.43×10−6 mL) / (1.486×10−7 m²) = 0.05 mm

B. To determine the number of moles of oleic acid in the monolayer, we are given the number of grams of oleic acid in the monolayer, which is 7.52×10−6 g. The molar mass of oleic acid is 282.46 g/mol. We can use these values to calculate the number of moles of oleic acid in the monolayer.

Number of moles = Mass / Molar mass = (7.52×10−6 g) / (282.46 g/mol) = 2.66×10−8 mol

C. To calculate the surface area of one molecule of oleic acid, we are given that the molecule is shaped like a cylinder with a height 10 times larger than the radius. We can assume that the length of the oleic acid molecule is the height of the cylinder and the diameter of the oleic acid molecule is the diameter of the cylinder.

Let the radius of the cylinder be 'r'. Then, the height of the cylinder is 20r.

The surface area of the cylinder can be calculated as follows:

Surface area = 2πr² + 2πr(20r) = 2πr(41r) = 82πr²

D. To determine the area of the surface covered by the molecules, we need to use the information that the circular surface can cover at most 90.6% of the total surface area. Let A be the total surface area covered by the molecules, and let x be the surface area not covered by the molecules. Then, we can write:

A + x = total surface area

We know that x is 9.4% of the total surface area, so we can write:

x = 0.094 * total surface area

Substituting this into the first equation, we get:

A + 0.094 * total surface area = total surface area

Simplifying, we get:

A = 0.906 * total surface area.

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The correct statement related to moles and concentration is: The number of particles of solute in a solution is measured in moles.

The correct option is 2.

Moles are used to express the amount of a substance in a given sample. In the context of solutions, concentration refers to the amount of solute present in a certain volume of the solution. The most common unit for expressing concentration is moles per liter (mol/L) or molarity (M).

Concentration can be calculated by dividing the number of moles of solute by the volume of the solution in liters. By measuring the number of moles of solute, we can determine the concentration of a solution and compare it to other solutions or determine if it has reached its saturation point, where no more solute can dissolve.

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The reactions are completed as folows;

2NaBr + Ca -----> CaBr2 + Na

2Mg + O2 ----> 2MgO

The electrochemical series has to do with the arrangement of atoms in order of reactivity. The metals that are up in the series are more reactive than the metals that are below.

In this case, the reactions are completed as folows;

2NaBr + Ca -----> CaBr2 + Na

2Mg + O2 ----> 2MgO

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Answer:

they're a non renewable source

Explanation:

Coal and petroleum, are formed by the deposit of organisms that have died a million years ago. under pressure and high temperature underground the dead organisms that used to live millions of years ago are formed into petroleum. however, coal is formed by the deposit of dead plants in the same process as petroleum. for the formation of petroleum and coal it takes a long term of time for it to be formed (millions of years). and that's why its limited

Answer:

Hi!!

Coal and petroleum deposits in the earth are limited.

They are non renewable resources. They are formed after a long period. They are formed by the remains of dead plants and animals present deep inside the earth crust. It took millions of years to get converted into coal and petroleum.

Hope it helps!!!!

Answer:

The heaviest element to be created by exothermic nuclear fusion is Iron

Explanation:

Because it is the heaviest element produced during fusion without having to add energy, and it is the lightest element produced during fission without having to add energy. Energy-wise, everything in the universe wants to be iron! Iron is the most abundant element on Earth, making up 34.5 percent of Earth's mass.

Option A - Linear.If all of the bonding electrons in a molecule are bonded in two hybrid sp orbitals,  the molecule most likely have linear shape.

An atom arrangement that is linear (less than a 180° angle) is referred to as a molecule. The centre atom of molecules with linear electron-pair geometries undergoes sp hybridization.

The two oxygen atoms are doubly linked to the carbon atom, which is the main atom of carbon dioxide. It can form bonds because it is tetravalent. The 180° angle formed by the electrons around the atom gives the molecule its linear molecular geometry.

A molecule is linear if it contains 2 bonds and 0 lone pairs. A molecule is trigonal planar if it contains 3 bonds but no lone pairs. A molecule is bent or angular if it contains 3 bonds and 1 lone pair.

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The nature of the hemoglobin in the lungs lungs is Hb(O2)4.

The volume of water added is  1851.7 mL

Le Chatelier's principle is a principle in chemistry that describes how a system at equilibrium responds to changes in its environment.

Using the dilution principle;

C1V1 = C2V2

C1 = Antilog(-2.025)

= 9.4 * 10^-3 M

C2 = Antilog (-4.050)

= 8.9 * 10^-5 M

Then;

V2 = C1V1/C2

V2 = 9.4 * 10^-3 M * 17.7/8.9 * 10^-5 M

V2 = 1869.4 mL

Volume of water added = 1869.4 mL - 17.7 mL

= 1851.7 mL

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Answer:

(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl

Explanation:

This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.

The radius of a calcium atom is 1.97 x 10^-8 cm.

What is lattice energy?

Lattice energy is the amount of energy needed to change one mole of an ionic solid into its gaseous ionic components. It can also be described as the amount of energy required to endothermically split one mole of an ionic crystal into gaseous ions in a vacuum.

What is radius?

The atomic radius is determined by measuring the distance between an atom's nucleus and its outermost shell.

Mass of 4 Ca atoms in fcc unit cell = 4 x 40.08/6.023 x 10^23

                                                       = 2.66 x 10^-22 g/unit cell

Volume of unit cell = 2.66 x 10^-22/1.54

                              = 1.73 x 10^-22 cm^3

Edge length (d) = cube rt.(1.73 x 10^-22)

                         = 5.57 x 10^-8 cm

radius of calcium atom = 5.57 x 10^-8/(sq.rt.(8))

                                    = 1.97 x 10^-8 cm

Therefore, the radius of a calcium atom is 1.97 x 10^-8 cm.

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The Fischer projections of the four aldotetroses, D- glucose, and L‑glucose are shown in the attached figures below.

In chemistry, the Fischer projection can be described as a two-dimensional representation of a 3-D organic molecule by projection. Fischer projections were proposed for carbohydrates and used by chemists, particularly in organic chemistry and biochemistry.

The main aim of Fischer projections is to show the chirality of a molecule and to differentiate between a pair of enantiomers. Some notable uses involve drawing sugars and depicting isomers.

All chemical bonds are represented as horizontal lines or vertical lines. The carbon chain is represented vertically and represented by the center of crossing lines. The orientation of the carbon chain is represented in such a way that the first carbon C₁ is at the top.

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Environmental groups may have supported cap-and-trade programs for SO2 emissions but not for NOx and heavy metals due to differences in their environmental impacts, technological feasibility, and the effectiveness of alternative regulatory approaches.

Environmental groups may have supported cap-and-trade programs for SO2 emissions due to the significant environmental and health impacts associated with SO2, such as the formation of acid rain and respiratory issues. Cap-and-trade programs provide a market-based approach to reducing emissions by setting a cap on total emissions and allowing companies to trade emission allowances. This approach incentivizes emission reductions and can effectively reduce SO2 levels.

On the other hand, cap-and-trade programs may not be as suitable for NOx and heavy metals due to several reasons. NOx emissions contribute to air pollution and can lead to smog formation and respiratory problems. However, reducing NOx emissions typically requires more complex and diverse control technologies, such as selective catalytic reduction (SCR) systems, which may not lend themselves well to the tradable permit system.

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The main misunderstanding about the lattice model is that it is often seen as a simplified representation of a complex system.

While it is true that the lattice model is a simplified representation, it is not necessarily less accurate or useful than more complex models. In fact, the lattice model can be a powerful tool for understanding the behavior of complex systems, particularly in the fields of physics, chemistry, and materials science. However, it is important to recognize that the lattice model is only one tool in the scientist's toolkit, and that it should be used in conjunction with other models and experimental data to build a comprehensive understanding of a system. Additionally, the lattice model may not always be appropriate for certain types of systems or phenomena, and scientists must exercise judgment in choosing the best model for a given situation.

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Answer:

Explanation:

To calculate the amount of heat needed to raise the temperature of the copper block, we can use the formula:

Q = m * c * ΔT

where Q is the amount of heat in joules, m is the mass of the copper block in grams, c is the specific heat capacity of copper in J/g-K, and ΔT is the change in temperature in Kelvin.

First, we need to convert the mass of the copper block from kilograms to grams:

m = 2.12 kg * 1000 g/kg = 2120 g

Next, we need to calculate the change in temperature in Kelvin:

ΔT = (88.0 °C + 273.15 K) - (25.0 °C + 273.15 K) = 336.30 K - 298.15 K = 38.15 K

Now, we can plug in the values into the formula:

Q = m * c * ΔT = 2120 g * 0.385 J/g-K * 38.15 K = 31233.98 J

Therefore, approximately 31,234 joules of heat are needed to raise the temperature of the 2.12-kg block of copper from 25.0 °C to 88.0 °C.

Answer:

A

Explanation:

Nicole, a 33 y.o. female was admitted to the hospital for dehydration after chemotherapy. Her height is 5′7′′, her current weight is 130 lbs, and her weight three weeks ago was 140 lbs.

To calculate her energy and nutrient needs, use the following: 1800 kcal per day (at 25kcal per kg), 80 g pro per day (at 1.3 g per kg), 2550 mL fluid per day (at 35 mL per kg), and other nutritional facts.
Energy needs:
Nicole's weight is 130 lbs, which equals 59 kg (130 lbs ÷ 2.2 lbs/kg). Nicole's energy needs are 25 kcal/kg, so she needs 25 x 59 = 1,475 kcal/day.

Therefore, Nicole's energy needs are 1,475 kcal per day.
Protein needs:
Nicole's weight is 130 lbs, which equals 59 kg (130 lbs ÷ 2.2 lbs/kg).

Nicole needs 1.3 g of protein per kg, which is equal to 1.3 x 59 = 77 g of protein per day.

Therefore, Nicole needs 77 g of protein per day.
Fiber needs:
According to the American Dietetic Association (ADA), the daily recommended amount of fiber is 14 g per 1000 kcal. Nicole's energy needs are 1,475 kcal per day, so she needs 14 x (1,475/1000) = 21 g of fiber per day.

Therefore, Nicole needs 21 g of fiber per day.
Fluid needs:
Nicole's weight is 130 lbs, which equals 59 kg (130 lbs ÷ 2.2 lbs/kg).

Nicole's fluid needs are 35 mL/kg, so she needs 35 x 59 = 2,065 mL of fluid per day.

Therefore, Nicole needs 2,065 mL of fluid per day.
Follow-up:
Nicole should be followed up with according to the doctor's instructions.

When someone is admitted to the hospital, the doctors will determine the best course of action for follow-up care.

It is important to follow-up with the doctor's instructions to ensure that Nicole is properly cared for.

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Answer:

kevin gates with his fine self.

Explanation:

A tank contains 8l of water in which is dissolved 32 g (grams) of chemical. a solution containing 2 g/l. The amount of chemical in the tank after 20 minutes is 98.66 g.

Given that:

rate r1 = 4 L/min

rate r2 = 2 L/min

concentration c1 = 2 g/L

V(0) = 8 L

A(0) = 32 g

the equation is given as :

ΔV = r1 Δt - r2Δt

dV/dt = 2

integrating the condition , we get

V(t) = 2(t+4)

ΔA  = c1r1 Δt - c2r2 Δt

dA/ dt = 8-2c2

c2 = A/ V

dA/dt = 8 - 2A/ V

now by putting the value of V, we get

dA / dt + 1 / t + 4 A = 8

linear equation has integrating factor :

I = e^ ∫ 1/( t + 4) dt = t + 4

d [ ( t + 4)A] / dt = 8 (t + 4)

(t+ 4 )A = 4(t + 4)² + c

A(t) = (1 / t + 4 ) [ 4(t + 4)² + c]

A(0) = 32 means c = 64

A(20) = (1/6) [(24)² + 16]

          = 296 / 3

          = 98.66 g

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Answer:Convection is heat transfer by the movement of currents within a fluid. During convection, heated particles of fluid begin to flow. This flow transfers heat from one part of the fluid to another. Heat transfer by convection is caused by differences of temperature and density within a fluid

Answer:

c. Looking for improvements

Explanation:

I took the quiz and it was right

Answer: C

Explanation:

just took the test

Answer:

D

Explanation:

D2O is the formula which is also 2H2O. D is an isotope of Hydrogen that is heavier.

During one turn of the citric acid cycle, a total of 12 ATP or GTP equivalents are produced. This occurs through a series of redox reactions that ultimately lead to the production of ATP or GTP.

Specifically, four pairs of electrons are transferred through the cycle, resulting in the production of three molecules of NADH and one molecule of FADH2. These molecules are then used in the electron transport chain to generate a total of 10 ATP equivalents.

In addition, one molecule of GTP is directly produced during the cycle, which can be converted to ATP if needed.

Overall, the citric acid cycle plays a critical role in the production of ATP, which is the primary source of energy for many cellular processes.

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HClO3 is the stronger Brønsted-Lowry acid between the two compounds.

In the Brønsted-Lowry acid-base theory, an acid is defined as a substance that donates a proton (H+) and a base is a substance that accepts a proton. To determine which of the two acids, HClO3 or HClO2, is stronger, we need to assess their ability to donate a proton.

HClO3, also known as chloric acid, has a central chlorine atom bonded to three oxygen atoms and one hydrogen atom. The presence of three electronegative oxygen atoms surrounding the central chlorine atom increases the acidity of HClO3. The oxygen atoms withdraw electron density from the chlorine atom, making it more willing to donate a proton, thus making HClO3 a stronger acid.

HClO2, also known as chlorous acid, has a similar structure with a central chlorine atom bonded to two oxygen atoms and one hydrogen atom. Compared to HClO3, HClO2 has fewer electronegative oxygen atoms surrounding the central chlorine atom. This reduced electron withdrawal decreases the acidity of HClO2, making it a weaker acid compared to HClO3.

Therefore, HClO3 is the stronger Brønsted-Lowry acid between the two compounds.

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Answer:

I. Luke has 81 postcards.

II. Brian has 54 postcards.

Explanation:

Let Luke's collection be L

Let Brian's collection be B

Translating the word problem into an algebraic equation, we have;

L = 27 + B

L + B = 135

Substituting equation 1 into equation 2, we have;

27 + B + B = 135

27 + 2B = 135

2B = 135 - 27

2B = 108

B = 108/2

B = 54

Therefore, Brian has 54 postcards.

To find the value of L;

L = 27 + B

L = 27 + 54

L = 81

Therefore, Luke has 81 postcards