Can someone help with these

Answer:

A) 0.4 km/hr

Explanation:

To find the average speed of the car, we have to find the slope of the graph.

We start by locating points. From the graph;

Then we use the relationship:

\(m \: = \: \frac{change \: in \: y}{change \: in \: x} \)

Substituting our values;

\(m \: = \frac{(4 \: - \: 0) \: km}{(10 \: - \: 0) \: hr } \\ = 0.4 \frac{km}{hr} \)

Therefore, the average speed of the car is 0.4 km/hr. Hence the best choice is (A).

Answer:

569K

Explanation:

Q = 3.5kJ = 3500J

mass = 28.2g

∅1 = 20°C = 20 + 273 = 293K

∅2 = x

c = 0.449

Q = mc∆∅

3500 = 28.2×0.449×∆∅

3500 = 12.6618×∆∅

∆∅ = 3500/12.6618

∆∅ = 276.4220

∅2 - ∅1 = 276.4220

∅2 = 276.4220 + ∅1

∅2 = 276.4220 + 293

∅2 = 569.4220K

∅2 = 569K

When the temperature is increased, there is the increase in thermal energy of the system. The final temperature of the iron in kelvins is 570 K.

The energy is the ability to do work.

Given is the energy Q = 3.5 kJ = 3500 J, mass of sample m = 28.2 g, specific heat of iron Cp = 0.449 J(g•K).

The initial temperature in kelvins is T1 = 20°C = 20 + 273 = 293K

The heat is related to the temperature difference as

Q = m c ∆T

Substitute the values into the expression,

3500 = 28.2 × 0.449 × ∆T

3500 = 12.6618 × (T2 -T1)

T2 - T1 = 276.4220

T2 = 276.4220 K +293 K

T2 = 569.4220K

The temperature of the iron is approximately 570 K.

Thus, the final temperature of the iron in kelvins is 570K.

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The biosensor recognition elements that are based on an organism's immune response include b. antibodies and d. peptides. Antibodies are proteins produced by the immune system in response to foreign substances, while peptides can also participate in immune responses by acting as signaling molecules or antimicrobial agents.

Both antibodies and peptides are biosensor recognition elements that are based on an organism's immune response. Antibodies are proteins produced by the immune system in response to specific antigens, and they bind to these antigens with high specificity and affinity. Peptides are short chains of amino acids that can be recognized by T cells, another component of the immune system. Aptamers, on the other hand, are synthetic molecules that can bind to specific targets with high affinity and specificity, but they are not based on immune recognition. Carbohydrates also do not typically play a role in biosensor recognition based on immune response. So, the correct answers to this question are b. antibodies and d. peptides.
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If the natural spring that feeds the river in Texas were to stop flowing, it would have a significant impact on the river's ecosystem. The river's water level would gradually decrease, and it could even dry up completely in severe cases. This could lead to a loss of habitat for many aquatic species that depend on the river for survival. The lack of water could also result in the death of fish and other organisms that rely on the river's ecosystem.

Furthermore, the river's water quality could also be negatively affected. The spring water that flows into the river is likely to be clean and free of pollutants, but without it, the river's water quality could be compromised. Other sources of water that may flow into the river could contain pollutants or contaminants, leading to degraded water quality.
In addition to the impact on the ecosystem, the river's recreational use could also be affected. The swimming pool that is fed by the spring would no longer have a source of water, making it unusable. The decrease in the river's water level could also make it difficult for recreational activities such as fishing and boating.
Overall, the loss of the natural spring that feeds the river would have a significant impact on the river's ecosystem, water quality, and recreational use. It is essential to protect and conserve natural resources such as springs and rivers to maintain a healthy and sustainable environment for all living organisms

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Answer:

B: 1s²2s²2p¹

Na: 1s²2s²2p⁶3s¹

Explanation:

A = 2

B = 1

C = 2

D = 6

E = 1

Answer:

KCI

Explanation:

Answer:

B). The smallest part of matter still retaining chemical properties.

B is the answer..............

Answer:

D. Carbon Dioxide

Explanation:

Carbon is what enters the plant. It isn't a product of the plant.

According to the speed formula, distance that Tony ran at  a constant speed of 10 m/s for a total of 60 seconds is 600 meters.

The speed (commonly referred to as v) of an object is the magnitude of the change of its position over time or the magnitude of the change of its position per unit of time; it is thus a scalar quantity.The average speed of an object in an interval of time is the distance traveled by the object divided by the duration of the interval; the instantaneous speed is the limit of the average speed as the duration of the time interval approaches zero. Speed is not the same as velocity.

Speed has the dimensions of distance divided by time. The SI unit of speed is the metre per second (m/s), but the most common unit of speed in everyday usage is the kilometre per hour (km/h) or, in the US and the UK, miles per hour (mph). For air and marine travel, the knot is commonly used.

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The values of the caring, professional nurse identified by the American association of colleges of nursing (AACN) include the following below:

This is referred to as a healthcare professional who specializes in caring for the sick and ensuring adequate recovery is achieved.

It is required for a qualified nurse to possess some values which will be important and vital in her execution of tasks in a health center. An example is having integrity which will ensure that all the patients are treated fairly and equally regardless of any differences such as ethnicity, gender etc.

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Answer:

\(K=1.12x10^9\)

Explanation:

Hello there!

Unfortunately, the question is not given in the question; however, it is possible for us to compute the equilibrium constant as the problem is providing the concentrations at equilibrium. Thus, we first set up the equilibrium expression as products/reactants:

\(K=\frac{[NO_2]^2}{[NO]^2[O_2]}\)

Then, we plug in the concentrations at equilibrium to obtain the equilibrium constant as follows:

\(K=\frac{(0.95)^2}{(0.0024)^2(0.00014)}\\\\K=1.12x10^9\)

In addition, we can infer this is a reaction that predominantly tends to the product (NO2) as K>>>>1.

Best regards!

Answer:

The total mass of mercury in the lake is 631,542.7 kg

Explanation:

Question: The given dimensions of the lake as obtained from a similar question posted online are;

The surface area of the lake, A = 100 mi²

The lake's average depth, d = 20 ft.

The concentration of the mercury, C = 0.4 μg Hg/mL = 0.4 × 10⁻⁶ kg Hg/L

Therefore, we have;

The volume of water mixture in the lake, V = A × d

∴ V = 100 mi² × 20 ft. = 2,787,840,000 ft.² × 20 ft. = 55,756,800,000 ft.³

1 ft³ = 28.31685 L

∴ 55,756,800,000 ft.³ = 55,756,800,000 ft.³ × 28.31685 L/ft.³ = 1.57885675 × 10¹² L

The total mass of mercury in the lake, m = C × V

∴ m = 0.4 × 10⁻⁶ kg Hg/L × 1.57885675 × 10¹² L = 631,542.7 kg

The total mass of mercury in the lake, m = 631,542.7 kg.

Answer:

short answers:

A learned behavior is a behavior that develops during an animal’s lifetime.

Examples of learned behaviors include tying one’s shoes or solving a math problem.

An inherited behavior is a behavior that an animal is born with.

An example of an inherited behavior is a bird building a nest.

Explanation:

Learned behaviors are those which are gradually developing in us through learning at different ages and it takes time. Inherited behaviour is innate to us which are incorporated with us by birth.

An organism develops a learned behavior as a result of experience. In contrast to learned actions, inherent behaviors are genetically preprogrammed and can be carried out without any prior knowledge or instruction.  

Certain behaviors have features that are both acquired and innate. Zebra finches, for instance, have a genetic predisposition to learn a song, but the song they sing is influenced by what they hear from their dads.

Inherited behaviors are inherited from parents to their offsprings. Such as  similar nature in sound, angriness, some diseases etc. They are not gathered from any experience and are accompanied by birth.

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The statement claims that 5mmol of BaCl were needed to attain the goal.

In a chemical equation, the word "aqueous" refers to a substance that is disseminated in saltwater (a solution in water). For instance, sodium chloride is produced when sodium hydroxide solution is added to diluted hydrochloric acid. The word "liquid" denotes the creation of liquid substances during a process.

In an aqueous solution, liquid water acts as the solvent. Solute (disintegrated) protons and atoms are surrounded by and incorporated into the web of bonds by water molecules. The dissolved organisms then spread out across the water.

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The reactions that correctly represent reactions of practical value for the synthesis of alkyl halides are:
CH3CH2CH(OH)CH3 + HCl at room temp CH3CH2CH2CH2OH + HBr at 120°CCH3CH2CH(OH)CH3 + HBr at 100°C
reactive in these types of reactions at room temperature.

These reactions involve the conversion of alcohols to alkyl halides through the reaction with hydrohalic acids HCl and HBr. The reaction conditions are practical, and the synthesis is useful for producing alkyl halides. Option b is not correct because tertiary alcohols like (CH3)3COH are generally not reactive in these types of reactions at room temperature. content loaded select all that correctly represent reactions of practical value for the synthesis of alkyl halidesCH3CH2CHOHCH3 + HCl CH3 3COH + HCl at room temperatureCH3CH2CH2CH2OH + HBr at 120ËCCH3CH2CHOHCH3 + HBr at 100E C

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One kilogramme of water needs one kilocalorie (kcal) of heat to raise its temperature by one degree Celsius (°C). It takes 4.18 kilocalories of heat to raise the temperature of 1 kilogramme of water by 1 degree Celsius.

As a result of a temperature difference, energy can be transferred from one body to another in the form of heat. It is a cornerstone of thermodynamics and is essential to many organic and synthetic processes. Heat is a form of energy that can be transmitted through radiation, conduction, and convection. Heat is created when particles in matter move about. In daily life, we encounter heat in the form of hot drinks, heated spaces, and warmth from the sun. Heat is employed in industry for a number of processes, including manufacturing, power generation, and cooking. Other scientific fields that depend on heat include physics, chemistry, and engineering.

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The purpose is to evaluate any differences in sign or magnitude between the theoretical predictions based on standard reduction cell potentials and the actual experimental results.

In the given table, the standard reduction potentials are listed for each voltaic cell. These values represent the potential difference between the anode and cathode in each cell.

By comparing these calculated cell potentials with the measured values, any differences in sign or magnitude can be observed.

The calculated cell potentials are based on theoretical values and assume ideal conditions, while the measured values take into account real-world factors such as temperature, concentration, and electrode surface area.

Differences in sign may arise due to the reversal of anode and cathode in the experimental setup, while differences in magnitude can be attributed to various factors affecting the efficiency of the electrochemical reactions, such as concentration gradients and kinetic limitations.

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Chlorofluorocarbons (CFCs) are not naturally occurring greenhouse gases.

Chlorofluorocarbons (CFCs) are not naturally occurring greenhouse gases. They are synthetic compounds that were widely used in refrigerants, solvents, and aerosol propellants.

CFCs were found to deplete the ozone layer in the upper atmosphere, leading to the adoption of the Montreal Protocol to phase out their use.

While they are not naturally occurring, they contribute significantly to global warming due to their strong greenhouse effect.

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Answer: 164.09 g/mol

Explanation:

A highly viscous resin is stored in a storage tank at 200 kPa. The resin is transported to a holding tank, opened to the atmosphere, 22 m away such that the level in the storage tank is maintained at 2m above the bottom of the tank. The diameter of pipe needed is approximately 25.5 mm.

The volume flow rate is given by:

Q = 15 m³/h = 15/3600 m³/s = 0.0041667 m³/s The viscosity and density of the resin are given as:

k = 2 Pa.s¹density = 1130 kg/m³The head in the storage tank is 2 m.

The pressure in the tank is P = 200 kPa. The pipe transports the resin from the storage tank to the holding tank which is opened to the atmosphere. Therefore, the pressure at the outlet of the pipe is atmospheric pressure P₀ = 101.3 kPa.

The pressure drop from the inlet of the pipe to the outlet is given by:

ΔP = P - P₀ = 200 - 101.3 = 98.7 k

Pa For flow through a cylindrical pipe, the Hagen-Poiseuille equation gives the pressure drop as:ΔP = 32μQ/πD⁴,

where μ is the viscosity of the fluid, Q is the volume flow rate, and D is the diameter of the pipe.

Rearranging the equation to solve for D:32μQ/πΔP = D⁴D = (32μQ/πΔP)⁰.²⁵Substituting the given values:

D = (32 × 2 × 0.0041667/π × 98.7)⁰.²⁵≈ 0.0255 m = 25.5 mm .

Therefore, the diameter of pipe needed is approximately 25.5 mm.  The diameter of pipe needed is approximately 25.5 mm.

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Option (E) . Cytokine receptors are associated with cytoplasmic protein kinases called JAKs , which become activated and binds to their respective cytokines .

Cytokines are the receptors which transmit various signals for cell survival, proliferation, differentiation, and functional activity, circulate in picomolar concentrations, and may increase in magnitude almost a thousand-fold in response to an infection or inflammation. Cytokines are crucial in controlling the growth and activity of the immune system cells and blood cells. Cytokines can exert systemic as well as local effects. A cytokine's actions may affect the same cell it was secreted from, other nearby cells or may act in a more endocrine manner and produce effects across the whole of the body, such as in the case of fever.

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Answer:

A. Milk

Explanation:

Cause is basics. It's proved by scientific I watched on TV and my teacher told me. I am a 100% sure.Go ask to your mother how many litres you drink her milk per day.

Below is an example of the open-chain structure (as a Fischer projection) of 2-deoxy-D-glucose.

The Fischer projection should be aligned vertically, with the carbon atoms at the top and bottom and the oxygen atoms on the left and right. The chiral carbon atoms should be labeled and any hydrogens attached to them should be explicitly shown. Note that bonds to other hydrogens should not be shown.

O O | /| | / | | H | H | H | | H | | H | | H | H | H | | H | |H | C--C--C--C--C

The diagram provided is a Fischer projection of 2-deoxy-D-glucose. The vertical alignment of the carbon atoms at the top and bottom, and the oxygen atoms on the left and right is correct. The chiral carbon atoms should be labeled and any hydrogens attached to them should be explicitly shown. Note that bonds to other hydrogens should not be shown.

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From the options given factors that affect the rate are:"temperature and concentration and catalysts".

As the temperature increases, also the rate of the reaction increases. The concentration of a catalysts helps a reaction to proceed more quickly to equilibrium.

Catalysts are molecules that help speed up a reaction without being consumed in the process. They lower the activation energy needed for the reaction to occur, which increases the rate of the reaction. As the temperature increases, the number of collisions between molecules of the reactants also increases, making it more likely for the reaction to occur.

The presence of a catalyst helps this process as it provides an alternative pathway for the reaction to take place which requires less energy than the uncatalysed pathway. This means that the reaction is able to occur more quickly and at a lower temperature, allowing it to reach equilibrium faster. Thus, the presence of a catalyst can significantly increase the rate of a reaction, particularly when the temperature increases.

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The initial pH of the solution is 1.76.

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So, at STP, there are around 891 grammes of nitrogen gas in every 759 litres.

The two stable isotopes of naturally occurring nitrogen (7N) are nitrogen-14 and nitrogen-15, with nitrogen-14 constituting 99.6% of all naturally existing nitrogen. Along with one nuclear isomer, 11mN, fourteen radioisotopes with atomic masses ranging from 10 to 25 are also known.

Assuming "ST" refers to standard temperature and pressure (0°C and 1 atm), we can use the ideal gas law to calculate the mass of nitrogen gas:

PV = nRT

where n is the number of moles, P is the pressure, V is the volume, and T is the temperature, and R is the gas constant.

The temperature and pressure are 273.15 K and 1 atm, respectively, at STP.

To solve for n, the number of moles, we can rearrange the ideal gas law equation as follows:

n = PV / RT = (1 atm) * (759 L) / (0.0821 L·atm/(mol·K) * 273.15 K) = 31.8 mol

Now we can calculate the mass of nitrogen gas:

mass = n * molar mass = 31.8 mol * 28.01 g/mol ≈ 891 g.

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To compound the given prescription, 1.08 g of boric acid should be used.

This problem involves calculating the quantity of boric acid needed to compound a prescription for eye drops. The prescription specifies the following ingredients and quantities:

Phenacaine Hydrochloride 1% (E value = 0.2)

Chlorobutanol ½ % (E value = 0.24)

Boric Acid q.s. (E value = 0.52)

Purified Water ad 60

Make isoton. sol.

Sig. One drop in each eye

The notation "q.s." means "quantity sufficient," which indicates that the amount of boric acid needed should be calculated based on its E value, which is 0.52.

The E value represents the amount of an ingredient needed to produce a given effect or function. In this case, boric acid is used as a buffering agent to adjust the pH of the solution.

To calculate the amount of boric acid needed, we can use the following equation:

E value = (mass of ingredient) / (total mass of solution)

Rearranging this equation, we can solve for the mass of boric acid:

mass of boric acid = E value x total mass of solution

Substituting the given values into this equation, we get:

mass of boric acid = 0.52 x 60 g

mass of boric acid = 31.2 g

However, we only need to use enough boric acid to achieve the desired buffering effect. The excess boric acid would be unnecessary and could cause harm to the eyes.

The safe and recommended concentration of boric acid in ophthalmic preparations is 1.8% or less.

To achieve a safe and effective concentration of boric acid in the solution, we can calculate the mass of boric acid needed using the desired concentration and total volume of the solution:

mass of boric acid = 1.8% x 60 g / 100

mass of boric acid = 1.08 g

Therefore, to make an isotonic solution with the desired ingredients and quantities, 1.08 g of boric acid should be used.

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