Learning Task 4: Read the instructions found on the next page. Answer the
questions. Write your answers in your answer sheet..​

Answer:

The answer is "all the cells are too small, which is not seen by the naked eye, that's why we use a microscope to see it".

Explanation:

In the given question the choices were missing so, we define the correct answer only.

Cells are the essential building blocks of all living entities. There will be trillions of cells within the body. They construct a body shape, absorb nutrients, transform them into energy, and conduct specialized features.  

It provides stability and guidance, encourages mitotic cell development, encourages active and passive transfer, generates energy, induces metabolic processes, and contraceptive support.

The scarcity of water in which electrolysis can be conducted is not a disadvantage of hydrogen as a fuel. Option E is correct answer.

Electrolysis is a process that uses an electric current to split water molecules into hydrogen and oxygen gases, and it is one of the methods used to produce hydrogen for use as fuel. However, the availability of water is not considered a significant limitation for hydrogen production since water is a widely available resource on our planet.

On the other hand, options A, B, C, and D are all considered disadvantages of hydrogen as a fuel, as obtaining free hydrogen gas, storing it in large tanks, its volatility, and the lack of infrastructure for transporting it are all significant challenges that must be addressed to make hydrogen a more practical fuel source. Therefore, option E is correct answer.

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Answer:

\(\boxed {\boxed {\sf 2.73 \ g \ He}}\)

Explanation:

We are asked to find the mass of helium gas given a volume.

1 mole of any gas occupies a volume of 22.4 liters. So, 1 mole of helium gas contains 22.4 liters of helium. Create a ratio using this information.

\(\frac {1 \ mol \ He }{ 22.4 \ L \ He}\)

We are converting 15.3 liters of gas to moles, so we multiply by that value.

\(15.3 \ L \ He *\frac {1 \ mol \ He }{ 22.4 \ L \ He}\)

The units of liters of helium (L He) cancel.

\(15.3 *\frac {1 \ mol \ He }{ 22.4}\)

\(\frac {15.3}{22.4} \ mol \ He\)

\(0.6830357143 \ mol \ He\)

The molar mass is the mass of 1 mole of a substance. These values are found on the Periodic Table as atomic masses, but the units are grams per moles. Look up the molar mass of helium.

Create another ratio using the molar mass.

\(\frac {4.0026 \ g \ He}{1 \ mol \ He}\)

Multiply by the number of moles we calculated.

\(0.6830357143 \ mol \ He *\frac {4.0026 \ g \ He}{1 \ mol \ He}\)

The units of moles of helium (mol He) cancel.

\(0.6830357143*\frac {4.0026 \ g \ He}{1 }\)

\(2.73391875 \ g \ He\)

The original measurement of volume has 3 significant figures, so our answer must have the same.

For the number we calculated, that is the hundredths place.

The 3 in the thousandths place to the right (2.73391875) tells us to leave the 3 in the hundredths place (2.73391875).

\(2.73 \ g \ He\)

15.3 liters of helium gas is approximately 2.73 grams of helium.

Explanation

NH4Cl(s) = NH4+(aq) + Cl-(aq) AH = +3.5 kcal/mole

We have some changes that shift the equilibrium to the right, according to Le Châtelier's principle.

I will write some of them:

By Adding amount of NH4Cl or by increasing the temperature because according to the heat of the reaction this is an endothermic reaction.

Answer: Increasing the temperature of the system.

The theoretical yield of NaCl in the diluted solution is 46.752 grams.

The amount of NaCl in the diluted solution will be the same as the amount in the stock solution, but divided by dilution factor.

Dilution factor is given by:

Dilution factor = Vstock / Vdilute

We have:

Vstock = x mL (unknown)

Vdilute = 20 mL

So, the dilution factor is:

dilution factor = Vstock / Vdilute = x / 20

Since we want a dilution factor of 5:

\(5 = 2 / (x / 20)\)

Solving for x, we get:

x = 40 mL

We need to add 20 mL of water to the stock solution.

The amount of NaCl in the diluted solution is given by:

NaCl = (0.4 M) * (20 mL) * (58.44 g/mol)

Calculating, we get:

amount of NaCl = 46.752 g

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The statement "Reaction of heating potassium permanganate produces potassium manganate" is false.

The reaction of heating potassium permanganate (KMnO₄) does not produce potassium manganate (K₂MnO₄). Instead, it undergoes a thermal decomposition reaction, resulting in the formation of different products.

When heated, potassium permanganate decomposes into potassium manganate (K₂MnO₄), manganese dioxide (MnO₂), and oxygen gas (O₂).

The reaction can be represented as follows:

2 KMnO₄(s) → K₂MnO₄(s) + MnO₂(s) + O₂(g)

Therefore, heating potassium permanganate leads to the formation of potassium manganate, along with manganese dioxide and oxygen gas. The color change from purple to green observed during the reaction is due to the formation of potassium manganate.

However, it is important to note that potassium manganate is not the sole product of the reaction but one of the products alongside manganese dioxide and oxygen gas.

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Complete question :

Reaction of heating potassium permanganate produces potassium manganate. T/F

In an air-conditioning system, the refrigerant undergoes a cycle of evaporation and condensation to cool the air. The refrigerant starts as a low-pressure gas in the evaporator coil, where it absorbs heat from the surrounding air and evaporates into a low-pressure gas. This evaporation process cools the air as well. The evaporator coil plays a crucial role in this system by facilitating the evaporation of the refrigerant and cooling the air.

On the other hand, the refrigerant transitions from a high-pressure gas to a high-pressure liquid in the condenser. The condenser is responsible for releasing the heat absorbed by the refrigerant in the evaporator to the surrounding air. As the refrigerant condenses into a high-pressure liquid, it releases heat, allowing it to transfer the heat from the inside of a building to the outside.

This cycle of evaporation in the evaporator and condensation in the condenser enables the refrigerant to remove heat from the indoor space and release it outside. By continuously circulating the refrigerant and repeating this process, an air-conditioning system can cool the air inside a building and maintain a comfortable temperature.

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The approximate concentration of reaction product in a solution that has an absorbance of 0.7 at ph 6.0 is based on the equation A = εbc given in the passage, the concentration c is the absorbance A divided by the absorptivity ε in a 1 cm path length cell. 0.7 divided by approximately 1400 gives 500 μM.

A = εbc

0.7 = 1400 x c

7/14000 = 1/2000 = 0.0005 = 5x10^-4 = 500 μM

1 μM = 1 x10 ^-6

The concentration of a substance is the amount of solute present in a given volume of solution. Concentration is usually expressed in molarity, defined as the number of solutes in 1 L of solution. Solution concentration is a measure of the amount of solute dissolved in a given amount of solvent or solution.

Concentrated solutions are solutions that contain relatively large amounts of solutes. Dilute solutions are solutions that contain relatively small amounts of solutes. The definition of concentration means the amount of an ingredient or part relative to other ingredients or parts. An example of concentration is the amount of salt to water in a brine solution.

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Answer:

the buoyancy of the magma, the pressure from the exsolved gases in the magma and the injection of a new batch of magma into an already filled magma chamber

The buoyancy of the magma is the main factor that controls the type of volcano that forms following eruption.

A volcano is a crack in the crust of the Earth, another planet, or a satellite from which molten rock, hot stone pieces, and hot gases are released in eruptions. An amazing demonstration of Earth's might is a volcanic eruption.

Eruptions may cause catastrophic loss of lives and property, particularly in areas of the planet that are highly inhabited, despite the fact that they are beautiful to observe. The buoyancy of the magma is the main factor that controls the type of volcano that forms following eruption.

Therefore,  the buoyancy of the magma is the main factor that controls the type of volcano that forms following eruption.

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The % lithium by mass in a sample of pure lithium carbonate : 18.79%

Proust states the Comparative Law that compounds are formed from elements with the same Mass Comparison so that compounds have a fixed composition of elements

% Lithium (Li) in Li₂CO₃(lithium carbonate) will remain the same even if the mass amount of Li₂CO₃ changes

Ar of Li = 6.941 g/mol

MW of  Li₂CO₃  = 73.891 g/mol

\(\tt \%Li=\dfrac{2.Ar~Li}{MW~Li_2CO_3}\times 100\%\\\\\5Li=\dfrac{2\times 6.941}{73.891} \times 100\%=18.79\%\)

Tetrodotoxin (TTX) specifically affects voltage-gated sodium channels.

These channels are responsible for the generation and propagation of action potentials in excitable cells, including neurons and muscle cells. TTX binds tightly to a specific site on the outside of the sodium channel, blocking the movement of sodium ions through the channel pore.

By blocking sodium channels, TTX prevents the influx of sodium ions into cells during depolarization, effectively inhibiting the generation and propagation of action potentials. This leads to the disruption of normal electrical signaling in excitable tissues, resulting in various physiological effects depending on the affected tissues.

Due to its potent inhibitory effects on sodium channels, TTX is known for its use as a toxin, primarily found in pufferfish and certain other marine organisms. Ingesting TTX-contaminated seafood can lead to severe poisoning, characterized by paralysis, respiratory failure, and potentially fatal consequences.

Research on TTX and its interactions with sodium channels has also provided valuable insights into the function and structure of these channels, contributing to our understanding of electrical signaling in cells and the development of drugs targeting sodium channels for therapeutic purposes.

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minerals are disbursed through the water

Explanation:

say you have a bottle of water and you leave it in a car when you go in to a store you come back and you see some particles in the water well that's mixture water is made of minerals so when it says the particles so when the mix the minerals get disbursed through out the water and they become invisible. that's why minerals water is a mixture

Answer:

1.1 mol of O2

Explanation:

First we need the balance chemical equation which is

2 H2O2 -------> 2 H2O + O2

This is important because in stoichiometry you can go from units of one thing to other by using mole ratios, here the mole ratio is 2 mol of H2O2  for one mole of O2.

\(2.2 mol H2O2 \frac{1mol O2}{2 mol H2O2}\) = 1.1 mol of O2

One of the most commonly known catalysed reaction is that of Hydrogen Peroxide turning into Water

In this reaction, we can use Potassium Permanganate (KMnO₄) or Palladium (Pd) as a catalyst.

These catalysts helps Hydrogen Peroxide turn into water and oxygen

Catalyst: Substances that change the rate of a chemical reaction and themselves remain chemically unchanged after the reaction are called catalysts.

Example:- In the process of manufacturing of ammonia Fe is used as Catalyst.

\(N _{2} (g)+ 3H _{2} (g) \huge \rightarrow {}^{Fe}\rightarrow \small{3NH _{3}(g)}\)

Note:- there is only one arrow. I was unable to put iron over the arrow ..

Answer:

Warming it would make it come out. On a cold day the honey is frozen and atoms will not move as fast and are close toghether. When you warm it the atoms will move faster and the honey will come out of the bottle

Explanation:

Answer:; 66 g is about 3/2 the value of the molar mass of CO2. It is reasonable that the sample contains 3/2 (1.5) mol.

Explanation:

M2 refers to the money supply measure known as M2 money stock.

The FOMC's decisions and actions can impact M2 through its control over interest rates, open market operations, and the influence on economic conditions and confidence. Changes in monetary policy by the FOMC aim to manage the money supply and promote price stability, economic growth, and employment.

M2 is a broad measure of the money supply that includes cash, checking and savings deposits, money market funds, and other time deposits.

The Federal Open Market Committee (FOMC) is a committee within the U.S. Federal Reserve System that is responsible for making decisions regarding monetary policy, including setting interest rates and implementing measures to manage the money supply.

The actions taken by the FOMC can have an impact on M2 and the broader money supply in the economy. Here's how:

1. Open Market Operations: The FOMC conducts open market operations by buying or selling government securities in the open market. When the FOMC buys government securities, it injects money into the banking system, increasing bank reserves and potentially leading to an expansion of M2.

2. Interest Rate Policy: The FOMC sets the target federal funds rate, which is the interest rate at which depository institutions lend and borrow funds from each other overnight. By adjusting the federal funds rate, the FOMC influences borrowing costs for banks and, in turn, affects their lending practices. Changes in interest rates can impact the demand for loans and affect the growth of M2.

3. Impact on Confidence and Spending: The FOMC's actions and communications can influence consumer and business confidence. When the FOMC signals a more accommodative monetary policy stance, it can encourage borrowing and spending, potentially leading to an increase in the growth of M2.

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Answer:

Fullerene, also called buckminsterfullerene, any of a series of hollow carbon molecules that form either a closed cage (“buckyballs”) or a cylinder (carbon “nanotubes”).

Explanation:

A fullerene is an allotrope of carbon whose molecule consists of carbon atoms connected by single and double bonds to form a closed or partially closed mesh, with fused rings of five to seven atoms. The molecule may be a hollow sphere, ellipsoid, tube, or many other shapes and sizes.

Answer:

khansamueen has already provided an answer.  This is an additional note on the many structures carbon may form, called allotropes.

Explanation:  Carbon can take on many forms.  They are all based only on the carbon atom, and are thus called alloptropes.  One of these is diamond, "a" in the attached image.  

Answer:

salt

Explanation:

because it has a much larger volume ratio

Answer: 2,3 and 5

Explanation:

Answer:

B. Less humidity

C. No precipitation

E. Cooler temperatures

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Bottom one; wavelength changes when the frequency changed.

whenever frequency shifts Consequently, a wave's wavelength rose as its frequency fell. An energetic wave with a short wavelength has a high frequency. Low frequency waves have lengthy wavelengths and little energy.

How does the wave change when the frequency does?

Small differences in the speed figures were due to experimental error rather than a physical law being demonstrated. The evidence is strong that wave frequency has no bearing on wave speed. While the wave speed was unchanged, a drop in wavelength was brought on by an increase in wave frequency.

The frequency of a sound wave remains constant while the wave speed and wavelength change when it enters a new medium.

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Cu(NO3)2 has a mass of 4.69 g in 25.0 g of a 1.00 M solution of Cu(NO3)2(aq). A physical term used to describe the amount of matter in a thing is "mass."

The formula: moles of solute = concentration x volume of solution can be used to determine the mass of Cu(NO3)2 contained in 25.0 g of a 1.00 M solution of Cu(NO3)2(aq). Finding the volume of the solution containing one mole of Cu(NO3)2 is the first step.

Per litre of solution, 1.00 M equals 1 mole of Cu(NO3)2.

Cu(NO3)2 weights 187.6 g per mole.

Cu(NO3)2 mole 1 = 187.6 g

Cu(NO3)2:0.1 mole = 18.76 g

to prepare a Cu 1.00 M solution (NO3)

2. 18.76 g of Cu(NO3)2 must be dissolved in 1.00 L of solution.

the mass of Cu(NO3)2 present based on the molar mass of Cu(NO3)2:

Cu(NO3)2 mass equals 4.69 g or 0.0250 mol x 187.6 g/mol.

Hence, the quantity of Cu(NO3)2 in Cu(NO3)2(aq) in a 1.00 M solution has a mass of 4.69 g per 25.0 g.

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Answer: 9514 1404 393

 4 2/3 ohms

The resistance is the ratio of voltage to current.

 R = V/I

 R = (14)/(3) = 4 2/3 . . . ohms

Explanation:hi ^^ have a great day hope this helps xlXCherryColaXlx (nice pfp btw)

The ph of solutions 8 is 4.75 and the PH of solution 9 is 9.25.

The pH of a solution is a measure of hydrogen ion concentration, which in turn is a measure of its acidity. Pure water dissociates slightly into equal concentrations of hydrogen and hydroxyl (OH−) ions.

Now,

CH3COOH + NaOH  ->  CH3COONa + H2O

pH = p Ka + log [CH3COONa] /[снз соон]

4.15 +( log 0.10m x 5 mL/ (0.1 Mx 10 mL) - (0.10 x5))

pH= 4.75

Calculated value is less than experimental value.

For solution 9:

NH4NO3 + NaOH ->  Na No3 + H2O + NH3

pH = P ka + log( [NH3] [NH4+])

= 9.25 + log ((0.10Mx5 mL) (0.1M x 10.0 mL -0.10 mx 5.0ml).

PH = 9.25

Calculated value is less than experimental value.

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Answer:

B) rate of growth I'd say

Explanation:

it sounds better I don't think anyone would use height of plants if they want to sound professional

Answer:

Number of electrons = Number of protons = 30

Number of neutron = 35

Atomic number of zinc = 30

Atomic mass = 65.39g/mol

Explanation:

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The first step in this calculation is to know how many liters is equal to 1 gallon, and the value is 3.785 liters, so now we have to make the following calculation:

1 gal = 3.785 Liters

30.0 gal = x Liters

x = 3.785 * 30.0

x = 114 Liters

Answer:

The answer is c

Explanation:

Answer:

C

Explanation:

Answer:

The cell wall surrounds the plasma membrane of plant cells and provides tensile strength and protection against mechanical and osmotic stress.