Which of these is a renewable resource? A) Gasoline that contains some alcohol B) Wind produced by the uneven heating of Earth's surface C) Natural gas pumped from deep underground D) None of these

1.04 ⨯ 10[tex]^{-4}[/tex] M

A = ε [tex]\cdot l \cdot c[/tex] by the Beer-Lambert law, where

A and ε are the same for both solutions. Therefore, [tex]l \cdot c[/tex] is constant; [tex]l[/tex] is inversely proportional to [tex]c[/tex]. The 100 mL sample would have a concentration 1/4.78 times that of the 45.0 mL reference.

The 13.0 mL standard solution has a concentration of 5.17 ⨯ [tex]10^{-4}[/tex] M. Diluting it to 45.0 mL results in a concentration of [tex]5.17 \times 10^{-4} \times \frac{13.0}{45.0} =[/tex] 1.494 M.

[tex]c[/tex] is inversely related to [tex]l[/tex] for the two solutions. As a result, c₂ = [tex] c_1 \cdot \frac{l_1}{l_2} = 1.494 \times 10^{-4} \times \frac{1}{4.78} =[/tex] 3.126 M.

The 30.0 mL sample has to be diluted by 30.0 / 100.0 times to produce the 100.0 mL solution being tested. The 100.0 mL solution has a concentration of 3.126 M. Therefore, the 30.0 mL solution has a concentration of [tex]3.126 \times \frac{100.0}{30.0} =[/tex] 1.04 ⨯ [tex]10^{-4}[/tex] M.

Answer:

The empirical formula is C₆H₁₀O₇.

Step-by-step explanation:

1. Calculate the masses of C, H, and O from the masses given.

Mass of C =  2.0402 g CO₂ × (12.01 g C/44.01 g CO₂) = 0.5568  g C

Mass of H = 0.6955 g H₂O  × (2.016 H/18.02 g H₂O)  = 0.077 81 g H

Mass of O = Mass of compound - Mass of C - Mass of H = (1.500 – 0.5568 – 0.077 81) g = 0.8654 g O

=====

2. Convert these masses to moles.

Moles  C = 0.5568  × 1/12.01  = 0.046 36

Moles H = 0.077 81 × 1/1.008 = 0.077 19

Moles O = 0.8654   × 1/16.00 = 0.054 09

=====

3. Find the molar ratios.

Moles  C = 0.046 36/0.046 36 = 1

Moles H = 0.077 19/0.046 36   = 1.665

Moles O = 0.054 09/0.046 36 = 1.167

======

4. Multiply the ratios by a number to make them close to integers

C  = 1        × 6 = 6

H = 1.665 × 6 = 9.991

O = 1.167 × 6  = 7.001

=====

5. Round the ratios to integers

C:H:O =6:10:7

=====

6. Write the empirical formula

The empirical formula is C₆H₁₀O₇.

=======

7. Calculate the empirical formula mass

C₆H₁₀O₇ = 6×12.01 + 10×1.008 + 7×16.00

C₆H₁₀O₇ = 72.01 + 10.08+ 112.0

C₆H₁₀O₇ = 194.09

=====

8. Divide the molecular mass by the empirical formula mass.  

MM/EFM = 194.14/194.09 = 1.000 ≈ 1

=====

9. Determine the molecular formula

MF = (EF)ₙ = (C₆H₁₀O₇)₁ = C₆H₁₀O₇

It is 78.08

Calcium =40.08

Fluorine = 2×19

40.08 + 38 = 78.08

B liquid hope this helps :)

Final answer:

The correct option is (b)"liquid". A substance that forms a vapor at room temperature is most often in the "liquid" state. This process is known as vaporization and is influenced by temperature and air pressure. The gaseous state of a substance that is typically a liquid or solid at room temperature is referred to as vapor.

Explanation:

A substance that forms a vapor at room temperature is generally in the liquid state. An example of this would be water, which exists as a liquid at room temperature and can evaporate into the air, forming water vapor. This process is known as vaporization (evaporation). The reverse process, where vapor condenses back into a liquid, is known as condensation. The phenomenon that describes the amount of gas from the substance that is present above the liquid is termed the vapor pressure of the liquid.

Matter typically exists in one of three states: solid, liquid, or gas. The state a substance exhibits depends partly on the environmental conditions, such as temperature and air pressure. It should be noted that while gases and vapors are both found in the gaseous state, the term 'vapor' specifically refers to the gaseous state of a substance that is a liquid or solid at room temperature.

Because water molecules at the surface of the water puddle attract more to one other than they do to the air molecules above them, they cling together and form a dome shape on the coin. Surface tension prevents the water molecules from falling out and spilling. ... So the surface tension of each liquid is different

The water doesn't spill off the penny due to a property known as surface tension and cohesion amongst water molecules. This tension forms a resistant 'skin' and allows the penny to hold more water than expected.

The water doesn't spill off the penny due to a property known as surface tension. This property results from the cohesive forces between water molecules. The water molecules at the surface of the droplet form a kind of 'skin' that resists breaking up, which enables the surface to hold more water than it would be otherwise possible if the forces were not present.

This is the same principle as to why a steel needle can seemingly 'float' on the water if placed gently, without breaking the surface tension. Similarly, when you were dropping water onto the penny, the water didn't spill because the surface tension was not broken.

This cohesion and surface tension prevent the water from spilling as quickly, allowing the penny to hold more water than you might expect.

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The correct answer is option C, that is, hypothesis.  

The hypothesis is the starting building block in the scientific method. It is also illustrated as an educated guess, based on previous observation and knowledge. A hypothesis refers to a recommended solution for an unexplained event, which does not fit into the present accepted scientific theory.  

The fundamental concept of a hypothesis is that there is no pre-determined result. For a hypothesis to be considered as scientific hypothesis, it has to be something, which can be refuted or supported via carefully crafted observation or experimentation.  

In the balanced chemical equation 2H2 + O2 → 2H2O, the coefficients represent 2 moles of hydrogen gas reacting with 1 mole of oxygen gas to produce 2 moles of water. So the correct option is D.

The coefficients in a balanced chemical equation provide the molar ratio of the reactants and products involved in the reaction. For the equation, 2H2 + O2 → 2H2O, the coefficients indicate the following: The 2 before H2 means 2 moles of hydrogen gas are needed, the O2 has no coefficient in front which means 1 mole of oxygen gas is required, and the 2 before H2O represents 2 moles of water are produced. The coefficients reflect the conservation of mass and atoms in the reaction, ensuring that the number of atoms for each element is the same on both sides of the equation.

i believe the answer would be zinc or Zn

Seems to me it's graph A, based on the trends.

The correct answer is option d, that is, the solubility of a solid is highly dependent on temperature.  

Solubility refers to the maximum amount of a component, which will get dissolved in a given concentration of solvent at a particular temperature. The temperature influences the solubility of both gases and solids. The temperature has a direct influence on solubility.  

For most of the ionic solids, enhancing the temperature elevates how briskly the solution can be formed. With the increase in temperature, the movement of the solid particles takes place briskly that enhances the chances that they will associate with the majority of the solvent particles. This leads to enhancing the rate at which the solution takes place.  

The study of chemicals and bonds is called chemistry. There are two components in the solution and these are solute and solvent.

The correct answer is option D, that is, the solubility of a solid is highly dependent on temperature.  

For most of the ionic solids, enhancing the temperature elevates how briskly the solution can be formed. With the increase in temperature, the movement of the solid particles takes place briskly that enhancing the chances that they will associate with the majority of the solvent particles. This leads to enhancing the rate at which the solution takes place.  

Hence, the correct answer is option D.

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Answer:

D. 40 % increase  

Step-by-step explanation:

r = k[A]²/[B]

The rate is inversely proportional to [B]. If [B] is doubled, the rate is halved.

We must double this rate to get back to the original.

The rate is directly proportional to [A]².

2 = [A]₂/[A]₁²     Take the square root of each side

√2 = [A]₂/[A]₁     Multiply each side by [A]₁

[A]₂ = √2[A]₁

[A]₂ = 1.41[A]₁

We must increase [A] by 41 %.

Explanation:

The products of chemical reaction will be as follows.

      [tex]AgI + Fe_{2}(CO_{3})_{3} \rightarrow FeI_{3} + Ag_{2}CO_{3}[/tex]

To balance the equation, we will count the number of atoms on both reactant and product sides as follows.

Number of atoms on reactant side are as follows.

Number of atoms on product side are as follows.

We will balance the equation by multiplying AgI by 6 on the reactant side and [tex]FeI_{3}[/tex] by 2 and [tex]Ag_{2}CO_{3}[/tex] by 3 on the product side. Therefore, balanced chemical equation will be as follows.

   [tex]6AgI + Fe_{2}(CO_{3})_{3} \rightarrow 2FeI_{3} + 3Ag_{2}CO_{3}[/tex]

In this reaction, iron is replaced by silver and carbonate is replaced by iodide. Thus, it is a double displacement reaction.

Answer :  15675 J of heat was transferred.

Solution : Given,

Mass of liquid water = 75 g

Specific heat capacity = [tex]4.18J/g^oC[/tex]

Initial temperature = [tex]25^oC[/tex]

Final temperature = [tex]75^oC[/tex]

Formula used :

[tex]q=mc\Delta T\\\\q=mc(T_{final}-T_{initial})[/tex]

where,

q = heat energy

m = mass

c = specific heat capacity

[tex]\Delta T[/tex] = change in temperature

[tex]T_{initial}[/tex] = initial temperature

[tex]T_{final}[/tex] = final temperature

Now put all the given values in the above formula, we get

[tex]q=mc(T_{final}-T_{initial})[/tex]

[tex]q=(75g)\times (4.18J/g^oC)\times (75-25)^oC[/tex]

[tex]q=15675J[/tex]

Therefore, 15675 J of heat was transferred.

Answer: Option (C) is the correct answer.

Explanation:

Synthetic polymers are the polymers which are made by human beings.

For example, polyester, nylon, polyethylene etc are all synthetic polymers.

Whereas polymers which occur naturally in the environment are known as natural polymers.

For example, rubber, cotton, cellulose etc are all natural polymers.

Out of the given options though polyethylene is a synthetic polymer but it is not used as a fiber.

Hence, we can conclude that nylon is the synthetic polymer which is made into fibers that do not wear out easily.

Nuclear fuel

hope this helps!

if i remember correctly its plutonium

The answer is; D

While electromagnetic waves travel at an astounding 3.00 x 10^8 m/s and any delay seems imperceptible in short distances, in long distances, the waves take some time to reach the other end. This is why there is usually a small delay when ground communication tries to reach astronauts in space.  Also, remember that when a communication is relayed from the earth, it has to reach the destination and then wait for a response back to earth which covers the same distance or longer/shorter if the target is moving.

The distance to the moon is 384,400 km, therefore multiply this by 2 = 768,800 km

768,800,000m/300,000,000m = 2. 56 seconds

Therefore radio waves sent to the moon from earth will have a minimum  2.5  seconds delay not considering the processing time of this communication by the destination before sending feedback.  ‘Over to you’ signals end of a message by the messenger hence allowing the other messenger on the other to respond.  

The correct option is D) distance to the moon and the speed of electromagnetic waves.

The over-to method of communication is used to manage the delay in communication between Earth and the Apollo astronauts. This delay is a result of the finite speed of electromagnetic waves, including radio waves, and the significant distance between Earth and the moon.

Radio waves travel at the speed of light, which is approximately 299,792 kilometres per second (km/s) in a vacuum. Since the average distance from Earth to the moon is about 384,400 km, it takes radio signals about 1.28 seconds to travel one way, resulting in a round-trip communication delay of approximately 2.56 seconds.

Let's examine the other options to understand why they are incorrect:

A) Scattering of electromagnetic waves in space: While scattering can affect the clarity of a signal, it does not cause a consistent delay in communication. The delay is due to the travel time of the waves over the vast distance.

B) Fact that sound waves do not travel in a vacuum: This is true, but it is not relevant to the communication between Earth and the Apollo astronauts, which uses radio waves (electromagnetic waves), not sound waves. Radio waves can travel through the vacuum of space.

C) Poor reflective nature of the surface of the moon: The reflective nature of the moon's surface can affect communication when signals are bounced off the moon (such as in Earth-Moon-Earth communication), but it does not cause the primary delay in direct Earth-to-moon communication. The delay is due to the distance and the speed of the radio waves.

Therefore, the delay in communication that necessitates the over-to method is due to the distance to the moon and the speed of electromagnetic waves.

Answer:

Atlantic Ocean

Indian Ocean

Explanation:

Africa is bounded to the West by the Atlantic ocean and to the east by the Red sea and the Indian Ocean.

To the North, the Mediterranean separates Africa from Europe.

Around southern Africa, the Atlantic and Indian Ocean meets where they form the southern extreme of the continental mass.

The oceans around Africa plays a lot of important economic role on the continent.

Answer:

The correct answers are: Indian Ocean and Atlantic Ocean

Explanation:

Hello!

Let's solve this!

The African continent is located in southern Europe.

It is surrounded by the Atlantic Ocean and the Indian Ocean. It is also surrounded by the Mediterranean Sea and the Red Sea.

In this case the correct answers are: Indian Ocean and Atlantic Ocean

Answer:

Based on the information, the compound is a phospholipid.

Explanation:

Phospholipids are made up of a fatty acid tail which is hydrophobic in nature and a head which comprises of phosphates that is hydrophilic in nature. Hence, phospholipids are amphiphilic compounds so they will be partially soluble in water and will allow water-soluble substances to mix with fats.

Hence, the composition of the substance described in the question confirms that is a phospholipid. As it's structure contains hydrocarbon and phosphorus and might also contain nitrogen.

The chemical compound that is partially soluble in water and contains carbon, hydrogen, oxygen, nitrogen, and phosphorus atoms is likely a phospholipid. Phospholipids are essential components of cell membranes and play a crucial role in maintaining the structure and function of biological membranes.

Phospholipids consist of a hydrophilic (water-attracting) head and two hydrophobic (water-repelling) tails. The hydrophilic head typically contains a phosphate group, which contains both phosphorus and oxygen atoms. The hydrophobic tails are composed of fatty acid chains, consisting of carbon and hydrogen atoms.

The presence of nitrogen in the compound can be attributed to the amino group found in the phospholipid's structure. Phospholipids are amphipathic molecules, meaning they have both hydrophilic and hydrophobic regions, making them suitable for maintaining the solubility of water-soluble substances in fats. These molecules are essential for the formation of biological membranes, where they arrange themselves in bilayers with the hydrophilic heads facing the aqueous environment and the hydrophobic tails oriented inward, creating a stable barrier between aqueous compartments and nonpolar regions.

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Answer is: mass of slaked lime is 6.92 grams.

Balanced chemical reaction: Ca(OH)₂ + 2NH₄Cl → CaCl₂ + 2NH₃ + 2H₂O.

m(NH₄Cl) = 10 g; mass of ammonium chloride.

M(NH₄Cl) = 14 + 1·4 + 35.5 · g/mol.

M(NH₄Cl) = 53.5 g/mol; molar mass of ammonium chloride.

n(NH₄Cl) = m(NH₄Cl) ÷M(NH₄Cl).

n(NH₄Cl) = 10 g ÷ 53.5 g/mol.

n(NH₄Cl) = 0.187 mol; amount of ammonium chloride.

From balanced chemical reaction: n(NH₄Cl) : n(Ca(OH)₂) = 2 : 1.

n(Ca(OH)₂) = 0.093 mol.

m(Ca(OH)₂) = n(Ca(OH)₂) · M(Ca(OH)₂).

m(Ca(OH)₂) = 0.093 mol · 74.1 g/mol.

m(Ca(OH)₂) = 6.92 g.

The correct name for CoC12 is called phosgene.

The correct name for CoCI2 is cobalt(II) chloride. The word "chloride" means that there are chlorine ions in the substance.

Cobalt(II) chloride is a chemical made of cobalt and chlorine. The chemical formula for this substance is CoCl2. The word "cobalt(II) chloride" comes from a way of naming chemicals called  the Stock system. This system is used to name compounds that are not made of living things.

The name "cobalt(II)" tells us that the cobalt ion in this compound has an oxidation state of +2. The symbol "II" in Roman numeral stands for the oxidation state.

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Answer is: D) Light is emitted from an atom as an electron falls from an excited state to the ground state releasing a photon.

Electrons can jump from one energy level to another, absorbing or emitting electromagnetic radiation with a frequency ν (energy difference of the levels).

When electron jump from higher to lower energy level (shell), it emitting (releasing) energy.

For example, when the electron changes from n=4 (fouth shell) to n=2 (second shell), the photons are emitted.

Answer: Option D

Explanation:

The light is the visible spectrum which is seen by naked eyes. This can be a white light or some other color.

When energy is supplied to the atom, the electrons absorb energy and it tends to move from a lower energy level to a higher energy level.

When the electrons move from the excited state to the ground state, then it releases energy which is visible in the form of light.

This is how light is emitted from an atom.

Answer:

The reaction force accelerates the bat in a direction opposite that of the ball.

Explanation:

your welcome! (; (:

[tex]\text{Li}^{2+} \; (g) \to \text{Li}^{3+} \; (g)+ \text{e}^{-}[/tex]

Ionization energy is what it takes to free one mole of electrons from one mole of gaseous atoms or ions.

The first ionization energy takes electrons away from a neutral atom. The atom here has to be gaseous.

[tex]\text{Li}^{} \; (g) \to \text{Li}^{+} \; (g)+ \text{e}^{-}[/tex]

The second ionization energy removes one electron from the [tex]\text{Li}^{+}[/tex] ion. The ion shall also be gaseous.

[tex]\text{Li}^{+} \; (g) \to \text{Li}^{2+} \; (g)+ \text{e}^{-}[/tex]

Removes one more electron. Doing so will convert the [tex]\text{Li}^{2+} \; (g)[/tex] ion to a gaseous [tex]\text{Li}^{3+}[/tex].

[tex]\text{Li}^{2+} \; (g) \to \text{Li}^{3+} \; (g) + \text{e}^{-}[/tex].

The process above removes the third electron from lithium. Its energy change is the third ionization energy of this element.

The chemical equation representing the third ionization energy for lithium is;

[tex]Li^{2+} + e^{-} -----> Li^{3+}[/tex]

Ionization is the loss of electrons. The energy required for electrons to be lost is called the ionization energy.

For an atom having n electrons, there can be n number of ionization energies as electrons are successively lost from the atom.

The equation showing the third ionization energy of lithium has been shown above.

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Answer:

Southern Ocean

Explanation:

The Southern ocean is also referred to as the Antarctic ocean. It is the oceans below the latitude 60 degrees South. The currents in this oceans (Antarctic Circumpolar Current) circulate around Antarctica also shielding it from warmer waters from the equatorial regions. This keeps the Antartic region cold.

The ocean that surrounds Antarctica at the South Pole is the southern ocean. Therefore, option D is correct.

The Southern Ocean is the ocean that surrounds Antarctica at the South Pole. It is also known as the Antarctic Ocean or the Austral Ocean.

The Southern Ocean is unique among the world's oceans because it is defined by its current patterns and the specific characteristics of the water surrounding Antarctica.

The Southern Ocean is characterized by its cold temperatures, strong winds, and powerful ocean currents. It is known for having some of the roughest seas and most extreme weather conditions on Earth.

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The given statement that Koch's postulates would not be an effective method of determining the cause of hemophilia is true.

Hemophilia is a rare disorder which is due to genes abnormality or it is a genetic disorder, so we cannot apply Koch's postulate on it.

Answer:

It must be an alcohol.

Explanation:

For a compound to be amine there must be a nitrogen in it.So the given compound cannot be amine.

For a compound to be carbohydrate it must have a carbonyl group and at least one hydroxyl group. so the compound will have more than one oxygen atoms.

A hydrocarbon cannot have an oxygen in its molecular formula.

Hence the compound must be alcohol.

Also the general molecular formula of monohydric alcohol is CₙH₂ₙO, Which fits the given compound.

The charges in the finger are attracted by the charges in the doorknob because charges that are the same repel each other. Charges that are different attract each other. The electric field is pulled toward the other charged object if their charges are different.

Answer: The correct answer is Option A.

Explanation:

Equilibrium is defined as the condition when the concentration of the reactants and products are constant. The ratio of their concentration remains constant, it does not vary.

The forward reaction and backward reaction occur at the same rate.

Rate of forward reaction = Rate of backward reaction

From the graph, it is clearly visible that the reaction reached equilibrium a 2.75 seconds, where the concentration of reactants and concentration of products are constant. After this point, the concentration of products starts to increase and the concentration of reactants starts to decrease.

Hence, the correct answer is Option A.