Explain why there is a difference in the thickness of the crust between the side of the moon facing the Earth and the side that faces away from the Earth?

Group 4A (or IVA) of the periodic table includes the nonmetal carbon (C), the metalloids silicon (Si) and germanium (Ge), the metals tin (Sn) and lead (Pb), and the yet-unnamed artificially-produced element ununquadium (Uuq). The Group 4A elements have four valence electrons in their highest-energy orbitals (ns2np2).

Answer:

Energy is the capacity to do some physical activities or work, such as running, jumping, etc., while power is defined as the rate at which the energy is transferred, or the work is completed.Power is how fast energy is used or transmitted - power is the amount of energy divided by the time it took to use the energy The unit used to measure energy is joules, ergs and calories. Power is measured in watts.

Answer:

Power is how fast energy is used or transmitted - power is the amount of energy divided by the time it took to use the energy. Its unit is the watt, which is one joule per second of energy used.

Explanation:

What is the relation between power and energy?

Energy is the capacity to do some physical activities or work, such as running, jumping, etc. while power is defined as the rate at which the energy is transferred, or the work is completed.

my pleasure helping you lizzy

Answer: The ratio of the amounts of U 238 and Pb 206 in a rock sample enables the age of the rock to be estimated using the technique of radiometric dating. It moves back in the periodic table until the isotope falls in the band of stability at Pb 206.

Explanation:

Answer:

Alexis should conduct more trials to see if there is a correlation between magnet size and magnetic properties.

Explanation:

Answer:

The higher the temperature, the faster the particles move, the lower the temperature, the slower.

The electronegativity of the element affects the ability of its compounds to dissolve in different solvents.

Electronegativity is a measure of an atom's ability to attract shared electrons to itself.

Polar bonds have a positive and negative side to them, and therefore can attract water dipoles and dissolve in water.

If the polarities of the solvent and solute match (both are polar or both are nonpolar), then the solute will probably dissolve.

If the polarities of the solvent and solute are different (one is polar, one is nonpolar), the solute probably won't dissolve.

Hence, option D is correct.

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Answer:

The last option. Because it's not a curate or precise on the dot.

The molar mass of the gas, given that 3.25 g of the gas occupied 2.56 L is 30.66g/mol

To obtain the molar mass of the gas, we shall first obtain the number of mole of the gas. This can be obtained as follow:

PV = nRT

0.95 × 2.56 = n × 0.0821 × 280

Divide both sides by (0.0821 × 280)

n = (0.95 × 2.56) / (0.0821 × 280)

n = 0.106 mole

Haven obtain the mole of the gas, we shall determine the molar mass of the gas as follow:

Molar mass = mass / mole

Molar mass of gas = 3.25 / 0.106

Molar mass of gas = 30.66g/mol

Thus, the molar mass of the gas is 30.66g/mol

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Yes, a precipitate of PbCl2 will form when 50.0 mL of 0.10 M Pb(NO3)2 solution is added to 20.0 mL of 0.040 M NaCl solution. The amount of PbCl2 produced is calculated to be 0.16 moles.

A precipitate of PbCl2 will form if 50.0 mL of 0.10 M Pb(NO3)2 solution is added to 20.0 mL of 0.040 M NaCl solution. The reaction between these two solutions is as follows:

Pb(NO3)2 + 2 NaCl -> PbCl2 + 2 NaNO3
The amount of PbCl2 that is formed can be calculated with the following equation:

n (PbCl2) = (M (Pb(NO3)2) * V (Pb(NO3)2)) / (2*M (NaCl))
Where,

n (PbCl2) is the moles of PbCl2,

M (Pb(NO3)2) is the molarity of Pb(NO3)2,

V (Pb(NO3)2) is the volume of Pb(NO3)2, and

M (NaCl) is the molarity of NaCl.

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Answer:

Temperature & Humidity

Explanation:

If the body could not adapt to these changes, we wouldn't be able to live all over the planet; from the equator up to the polar caps.

Specific heat capacity of the metal  by the given values is 5.389 J/ g°C  

Mass of water = 140.0 g

Initial temperature of water = 20.0°C

Mass of a certain metal = 100.0 g

Initial temperature of metal = 100.0°C

Final temperature of water and metal = 95.0°C

Since the metal is at a higher initial temperature it will lose heat and the water having a lower initial temperature will gain heat.  

Thus, heat lost by metal = Heat gained by water  

formula: (mass metal )(initialT - finalT)( Cp metal ) = ( mass water )(finalT- initalT)( Cp water)  

After plugging in the given data we get,  

(100.0 g )(100.0 °C -95.0°C)( Cp metal) = (140.0g )(24.6°C-20.0°C) (4.184 J/g°C)  

(100.0g )(5.0C)( Cp metal )=(140.0g )(4.6°C)(4.184 J/g°C)  

(500 g°C) (Cp metal) = 2694.5 J  

(Cp metal) =5.389 J/ g°C  

Thus, specific heat capacity(Cp) of metal = 5.389 J/ g°C

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Answer:

To avoid spattering

Explanation:

If we are heating a hydrate to drive off the water of crystallization, we must initially heat the hydrate gently, at a lower temperature and then more strongly only after most of the water has been driven off in order to to prevent spattering.

Since we obtain the amount of water by the mass difference, Spattering  decreases the mass of water obtained and ultimately results in a lower percent of water being calculated for the hydrate.

The H35Cl molecule rotates 1.43x10⁻⁵ times during one vibrational period.



Let's start with calculating the rotational and vibrational energy of the molecule. The rotational energy of a molecule is given by the formula:

E_rot = (J(J+1)h²)/(8π^2I)

where J is the rotational quantum number, h is Planck's constant, and I is the moment of inertia of the molecule. The vibrational energy of a molecule is given by the formula:

E_vib = (v+1/2)hω

where v is the vibrational quantum number, h is Planck's constant, and ω is the vibrational frequency of the molecule.

For H35Cl, we can look up the moment of inertia (I) and vibrational frequency (ω) values. The moment of inertia is 3.6818x10⁻⁴⁷ kg m² and the vibrational frequency is 8.521x10¹³ Hz. We also know that the rotational quantum number (J) is 1 and the vibrational quantum number (v) is 0.

Plugging in these values to the above equations, we get:

E_rot = (1(1+1)h²)/(8π²(3.6818x10⁻⁴⁷)) = 4.162x10⁻²² J
E_vib = (0+1/2)hω = 3.611x10⁻²⁰ J

Now, let's compare these energies with kbt at 300 K. kbt is the thermal energy at room temperature and is given by the formula:

kbt = k_B*T = (1.38x10⁻²³ J/K)*(300 K) = 4.14x10⁻²¹J

We can see that the rotational energy is much smaller than kbt, while the vibrational energy is larger. This makes sense, since rotational energy levels are typically much closer together than vibrational energy levels.

Moving on to the period for vibration and rotation. The period for vibration is given by the formula:

T_vib = 2π/ω = 1.847x10⁻¹⁴ s

The period for rotation is given by the formula:

T_rot = (8π^2I)/(hJ(J+1)) = 1.29x10⁻¹⁰ s

Finally, we need to determine how many times the molecule rotates during one vibrational period. We can do this by dividing the vibrational period by the rotational period:

T_vib/T_rot = 1.43x10⁵

This means that the H35Cl molecule rotates 1.43x10⁻⁵ times during one vibrational period.

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Considering the Charles' law, the gas would have a temperature of -109.2 C.

Finally, Charles' law establishes the relationship between the volume and temperature of a gas sample at constant pressure. This law says that the volume is directly proportional to the temperature of the gas. That is, if the temperature increases, the volume of the gas increases, while if the temperature of the gas decreases, the volume decreases.

Charles' law is expressed mathematically as:

\(\frac{V}{T} =k\)

If you want to study two different states, an initial state 1 and a final state 2, the following is true:

\(\frac{V1}{T1} =\frac{V2}{T2}\)

In this case, you know:

You can see that the pressure remains constant, so you can apply Charles's law.

Replacing in the Charles's law:

\(\frac{10 L}{293 K} =\frac{6 L}{T2}\)

Solving:

\(\frac{10 L}{293 K} T2=6 L\)

\(T2=\frac{6 L}{\frac{10 L}{293 K} }\)

T2=163.8 K= -109.2 C

The gas would have a temperature of -109.2 C.

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In a voltaic (galvanic) cell, oxidation occurs at the anode and is where anions in the salt bridge moves toward.

Galvanic Cell or Voltaic Cell is an electrochemical cell that converts the energy of spontaneous redox reactions into electrical energy. In galvanic cell oxidation occurs at the anode and reduction occurs at the cathode. The anode is positive and cathode is negative, anode attracts anions from solution in an electrolytic cell.

Thus from the above conclusion we can say that In a voltaic (galvanic) cell, oxidation occurs at the anode and is where anions in the salt bridge moves toward.

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Answer:

B

Explanation:

Answer: conjugate base of a weak acid

Explanation: If the anion is a conjugate base of a weak acid, the solution would be basic. This is because weak acids do not produce enough hydrogen ions in the solution so does not really affect the acidity, so the conjugate base can react with water in the solution to produce a basic solution.

Answer:

B)

Explanation:

The mass remains the same before the reaction and after. A chemical reaction takes place when vinegar and baking soda are mixed. One of the new substances formed is carbon dioxide gas. If the carbon dioxide gas is contained, the mass of the substances will stay the same according to the Law of Conservation of Mass

Answer:

B is the correct option.

Explanation:

The system is a closed one because Alison closed the container with a balloon immediately. With this mass can't change and law of conservation of mass states in chemical change, mass in neither created nor destroyed.

Answer:

6.273×10²³

Explanation:

hope this is useful friend

Answer:

6.023 × 10²³

Explanation:

Avogadro's number is used for calculating masses and moles and can applied to Stoichiometry. Avogadro's number is useful for atoms and molecules

Answer:scientists finished deciding the human genome in 2001. This research helped genetics analyze and islote sections of DNA for investigation. Without this information and the technology invented during the Human Genome Project, Hugh would not have been able to extract portions of his daughters DNA. Also, he wouldn’t have been able to see the genes that did not function properly in his daughters DNA.

Explanation: this is a right answer for PLATO.

\(NH_{4} Br\)(aq ) is expected to have a Ph less than 7 as on dissociation the following constituents will separate

\(NH_{4} Br\)    +  \(H_{2}O\)    → \(NH_{4} OH\)(weak base)    +   \(HBr\) (strong acid)

A weak base is a strong acid hence B is  correct

\(LiNO_{3}\) It is a salt of a strong base and weak acid hence basic  and a PH greater than 7

\(MgCl_{2}\)it is a salt of a strong base and strong acid hence a neutral solution of PH 7

\(RbCH_{2} H_{3} O_{2}\) It is a salt of a strong base and weak acid hence basic  and a PH greater than 7

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Answer:D

D

DDD

DDDDDDDDDD

Explanation:

Answer:

C. 1 and 3 only

Explanation:

In this element representation';

The superscript (23) s the mass number. Mass Number = Protons + Neutrons

-The subscript (11) is the atomic number.

Atomic Number = Protons

This means;

Number of Protons = 11

Number of Neutrons = 23 - 11 = 12

Number of electrons = 11 (Since it is a neutral atom)

Also sodium belongs to group 1 hence number of outer electrons = 1

The correct option is;

C. 1 and 3 only

The vapor pressure of a warm pale higher than the vapor pressure of a cold lake because Warm water evaporates more quickly.

Hence, Option B is correct answer.

The process in which a liquid or solid is converted into vapour is called Evaporation. When water gains the heat energy then it changes in to gas. When the temperature increases it speeds up the rate of evaporation.

The temperature of warm water increases, the kinetic energy of the warm water molecule also increases.

Thus from the above conclusion we can say that The vapour pressure of a warm lake is higher than the vapor pressure of a cold lake because Warm water evaporates more quickly.

Hence, Option B is correct answer.

Disclaimer: The question was given incomplete on the portal. Here is the complete questions.

Question: Why is the vapor pressure of a warm lake higher than the vapor pressure of a cold lake?

A. Warm water has a greater heat of vaporization.

B. Warm water evaporates more quickly.

C. Cool water evaporates more quickly.

D. Cool water has a greater heat of vaporization.

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CaCl₂ 1 moles lower the freezing point of water more than 1 mol of NaCl because of the amount of dissolved particles determines the colligative qualities.

Colligative qualities are inversely proportional to the quantity of dissolved particles, hence the solution with the highest concentration of dissolved particles will exhibit the largest divergence. When NaCl dissolves, two ions, Na+ and Cl, are produced.

However, CaCl₂ disintegrates into three ions when it dissolves: one Ca²⁺ion, two Cl ions. CaCl₂ will therefore have a 50% greater effect on the freezing point depression than NaCl, mole for mole.

This explanation is overly straightforward. In actuality, you have to take ions' impact on ice and water's equilibrium into account.

factor van't Hoff

Tfreeze = I m Kf provides the freezing point depression.

where

Tfreeze= the change in temperature

I = the van't Hoff factor

for example, NaCl has two particles, CaCl₂ has three, and urea CO(NH₂)₂ has just one particle because it does not dissociate in water)

m= the concentration of the freezing solution

Kf is  cryoscopic constant of the solvent

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Answer:

is water polar? dissolves in water because the energy released when bonds form between the K+ ion and the negative end of the neighboring water molecules and between the MnO4- ion and the positive end of the solvent molecules compensates for the energy it takes to separate the K+ and MnO4- ions. dissolves in water because the energy released when bonds form between the K+ ion and the negative end of the neighbor

Explanation:

C/ If Fe is greater than Fg, the negatively charged oil droplet will move freely toward the negatively charged plate.

In the Millikan oil droplet experiment, the negatively charged oil droplets are subjected to an electric field created by the charged plates. The electric force (Fe) acts on the oil droplet in a direction opposite to the gravitational force (Fg). When Fe is greater than Fg, the electric force overcomes the gravitational force, causing the negatively charged oil droplet to experience an upward force. As a result, the oil droplet moves freely upward toward the negatively charged plate.

Option B is incorrect because if Fe is equal to Fg, the forces balance each other, resulting in a stationary droplet. However, the question states that Fe is increased until it is greater than Fg, implying that the droplet is no longer stationary but moves in response to the electric force.

Therefore, option C is the correct answer, as it describes the effect of an electric field on the motion of a negatively charged oil droplet in the Millikan oil droplet experiment.

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Answer:

The energy consumed by animals in the form of glucose is conserved because it is transformed into chemical energy as carbon dioxide is produced during respiration.

Explanation:

There's no diagram....but I kinda figured it from the description.

The best explain at location F is the energy consumed by animals in the form of glucose is conserved because it is transformed into chemical energy as carbon dioxide is produced during respiration.

During aerobic cellular respiration, glucose reacts with oxygen, forming ATP ( Adenosine triphosphate) that can be used by the cell. Carbon dioxide and water are created as byproducts. The overall equation for aerobic cellular respiration is: In cellular respiration, glucose and oxygen react to form ATP ( Adenosine triphosphate)

Adenosine triphosphate is an organic compound which gives energy to living organisms to drive many operations in living cells such as muscle contraction, muscle pumps, nerve impulse propagation, condensate dissolution, and chemical synthesis.

Therefore, the best explain at location F is the energy consumed by animals in the form of glucose is conserved because it is transformed into chemical energy as carbon dioxide is produced during respiration.

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