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Large-scale convection currents create divergent plate boundaries in science.

This refers to vertical motion organized on a larger scale than atmospheric free convection, it is associated with cumulus clouds. Examples of large-scale convection currents patterns of vertical motion is hurricanes or migratory cyclones.

Large convection currents in the aesthenosphere send heat to the surface, where plumes of less dense magma break apart the plates at the spreading centers, giving rise to divergent plate boundaries.

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Answer:

pfffft definitely 10. smh silly goose

"Ground squirrels eat nuts, leaves, roots, seeds, and other plants. They also catch and eat small animals, such as insects and caterpillars.Though they are terrific climbers, these squirrels do come to the ground in search of fare such as nuts, acorns, berries, and flowers. They also eat bark, eggs, or baby birds."

The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. The frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.

The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. However, for the photoelectric effect to occur, the frequency of the incident light must be above a certain threshold frequency.

The threshold frequency is the minimum frequency of light required to dislodge electrons from the material. Below this threshold frequency, regardless of the intensity or duration of the light, no electrons will be emitted.

This behavior can be explained by the particle-like nature of light, where light is composed of discrete packets of energy called photons. The energy of a photon is directly proportional to its frequency. Only photons with energy greater than or equal to the binding energy of the electrons in the material can dislodge them.

Therefore, the frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.

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Answer:

I think you should go read up on the periodic table

For this question, we can use Boyle's Law formula to answer, since this law is an experimental gas law that states that pressure and volume have an inverse relationship. The formula is:

P1V1 = P2V2

We have:

P1 = ?

V1 = 1000 mL

P2 = 160 atm

V2 = 700 mL

Now we add these values into the formula:

P1*1000 = 160*700

P1 = 112 atm

The rate expression is k [BF₃]²[NH₃], overall order is 3, rate constant k is 1.13 × 10⁻³ mol⁻² dm⁶ s⁻¹.

The rate expression for this reaction can be written as:

Rate = k [BF₃]^m[NH₃]^n

The method of initial rates can be used to calculate the values of m and n. When we compare experiments 1 and 2, notice that halving the concentration of [NH3] reduces the initial rate of reaction. This suggests that the reaction is first order in terms of [NH3], implying that n = 1.

When comparing experiments 1 and 3, notice that increasing the concentration of [BF3] by a factor of 2.5 increases the initial rate of reaction by a factor of 9.39 (i.e., 2.13/0.227). This shows that the reaction is about second order in relation to [BF3], i.e., m 2.

Therefore, the rate expression for the reaction is:

Rate = k [BF₃]²[NH₃]

The overall order of the reaction is m + n = 3.

Using the data from experiment 4, substitute the values and solve for k:

Rate = k [BF₃]²[NH₃]

1.02 × 10-¹ = k (3.00 × 10⁻¹)² (1.00 x 10⁻¹)

k = 1.02 × 10-¹ / (3.00 × 10⁻¹)² (1.00 x 10⁻¹)

k = 1.13 × 10⁻³ mol⁻² dm⁶ s⁻¹

Therefore, the rate constant k is 1.13 × 10⁻³ mol⁻² dm⁶ s⁻¹.

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The balanced chemical equation for the dissociation of Ba(OH)₂:

Ba(OH)₂(s) → Ba₂+(aq) + 2OH-(aq). Also, Molar concentration is 1.68 M.

a. The balanced chemical equation for the dissociation of Ba(OH)₂:

        Ba(OH)₂(s) → Ba₂+(aq) + 2OH-(aq)

b. To calculate the molar concentration of the hydroxide ion (OH-):

The number of moles of OH- ions present in the solution is twice the number of moles of barium hydroxide since the balanced equation shows that each mole of Ba(OH)2 produces 2 moles of OH- ions.

Moles of OH- = 2 × 0.550 mol = 1.10 mol

The molar concentration of OH- is given by the formula:

Molarity (M) = Moles of solute / Volume of solution (in liters)

Molarity of OH- = 1.100 mol / 0.655 L = 1.680 M

c. Since the balanced equation for the dissociation of Ba(OH)₂ shows that for every mole of Ba(OH)₂, 2 moles of OH- ions are produced, the H+ concentration can be determined using the concept of Kw, the ion product of water.

Kw = [H+][OH-]

[H+] = Kw / [OH-]

[H+] = (1.0 × 10⁻¹⁴) / (1.680 M)

Calculating the H+ concentration using the above formula will give the H+ concentration in the solution.

d. To calculate the pH, pOH, and determine if the solution is acidic, basic, or neutral:

pOH = -log[OH-]

pH = 14 - pOH

Once you calculate the pOH, you can subtract it from 14 to find the pH. If the pH is less than 7, the solution is acidic. If the pH is greater than 7, the solution is basic. If the pH is exactly 7, the solution is neutral.

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Answer:

The best existing methods of control—artemisinin-based drug treatment and insect control with chemical sprays and treated bednets—can reduce the burden of disease substantially, and can even eliminate the disease in some regions,

hope this will help you more

Answer:

linear electron and molecular geometry with a bond angle of 180 degrees and a hybridization of Sp

Explanation:

Answer:

a) electron

Explanation:

Answer:

a

Explanation:

i took the test

Answer: They share electrons and become bonded together.

Explanation: Most interactions among atoms take place in the outermost shell of each atom. The number of each electron in this shell determines how an atom combines with other atoms to form compounds. When atoms combine they gain, lose or share electrons in such a way that the outer shells become chemically complete.

Answer:

1409725 m^3

Explanation:

volume = length * width * height

volume = (1.07e2) * (31) * (4.25e2)

volume = 1409725 m^3

electricity can flow well through magnetic poles

Answer:

That would be 90 grams

Explanation:

This should be right but please, please, please correct me if I'm worng because I dont  want anyone to fail because of me. Have a great day luv <3  

The answer is option B , 90 grams of potassium chloride(KCl) is needed to saturate exactly 300 grams of water at 10°C

The measure of the degree to which a substance gets dissolved in a solvent to become a solution.

The solubility of KCl in water at 10°C is 31.2gm/100gm of water .

So in 300 gm of water 3 * 31.2 gm = 93.6 gm

Using Significant Figures we can select option B  i.e. 90 gm.

Hence Option B , 90 grams of potassium chloride is needed to saturate exactly 300 grams of water at 10°C

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Answer: 0.125 moles F2

Explanation: 1.5x1023 atoms of F = 0.75x10^23 molecules F2

moles F2 = 0.75x10^23/avogadro number = 0.125 moles

There are 0.25 moles in 1.5 x \(10^{23}\)  atoms of fluorine.

Given,

In one mole we have,

6.02 x \(10^{23}\) atoms.

1 mole = 6.02 x \(10^{23}\) atoms

Find the number of moles in 1.5 x \(10^{23}\) atoms of fluorine.

We have,

1 mole = 6.02 x \(10^{23}\) atoms

Multiply  1.5 x \(10^{23}\) / 6.02 x \(10^{23}\) on both sides

1.5 x \(10^{23}\) / 6.02 x \(10^{23}\) x 1 mole = 1.5 x \(10^{23}\) / 6.02 x \(10^{23}\) x 6.02 x \(10^{23}\) atoms

1.5/6.02 mole = 1.5 x \(10^{23}\)  atoms

0.25 moles = 1.5 x \(10^{23}\)  atoms.

Thus there are 0.25 moles in 1.5 x \(10^{23}\)  atoms of fluorine.

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Answer:

40,113 years

Explanation:

To find the age of the sample, you need to use the half-life formula:

\(N(t)=N_0(\frac{1}{2})^{t/h\)

In this formula:

------> N(t) = current mass (g)

------> N₀ = initial mass (g)

------> t = time passed (yrs)

------> h = half-life (yrs)

You can plug the given values into the equation and rearrange the formula to find "t".

N(t) = 0.781 g                       t = ? yrs

N₀ = 100 g                           h = 5730 yrs

\(N(t)=N_0(\frac{1}{2})^{t/h\)                                           <----- Half-life formula

\(0.781=100(\frac{1}{2})^{t/5730}\)                                     <----- Insert values

\(0.00781=(\frac{1}{2})^{t/5730}\)                                       <----- Divide both sides by 100

\(log_{1/2}(0.00781)=log_{1/2}((\frac{1}{2})^ {t/5730})\)               <----- Take \(log_{1/2}\) of both sides

\(7.00 = \frac{t}{5730}\)                                                   <----- Solve \(log_{1/2}\)

\(40,113 = t\)                                                   <----- Multiply both sides by 5730

The given sample is 40,113 years .

Half-life, in radioactivity, is the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay.

Half-life formula,

\(\rm N(t)\;=N_0(\dfrac{1}{2})^\frac{t}{t1/2}\)   .......(1)

where,

N(t)=current mass

N₀=initial mass

t=time period

h=half -life

Given,

N(t)=0.781g, t=? yrs, N₀=100g, h=5730 years

\(\rm N(t)\;=N_0(\dfrac{1}{2})^\frac{t}{t1/2}\)

put the values, in ......(1)

0.781=100(1/2) \(t/5730\\\)

log₁/₂(0.00781)=log₁/₂ ( 1/2)\(t/5730\)

7=t/5730

40,113=t

Hence, the given sample is 40,113 years .

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Answer:

welp to bad got nothing for you ezcecect good luck bye btw its always the one you think its not

Explanation:

dugg

Answer:

copper metal is a product of the cell reaction.

Explanation:

In writing the line notation of a cell reaction, we ought to recall that the anode is placed at the left hand side of the notation while the cathode is placed at the right hand side of the notation.

If we look at the line notation shown in the question, we will realize that the Cu2+ (aq) | Cu(s) half cell is the cathode and that copper metal is the product of the reaction as shown by the notation.

Answer:

Explanation:

The relative speed and distance of atoms in a substance depend on the state of matter.

In a solid, atoms are closely packed together and have minimal movement or vibration. Their relative speed is low and their distance from one another is short.

In a liquid, atoms are still close together but have more movement and freedom of movement than in a solid. Their relative speed is slightly higher than in a solid, and their distance from one another is slightly longer.

In a gas, atoms are widely spaced and have a high degree of movement and freedom of movement. Their relative speed is much higher than in a solid or liquid, and their distance from one another is much greater.

In a plasma, atoms are ionized and have a high degree of movement and freedom of movement. Their relative speed is much higher than in a solid, liquid or gas, and their distance from one another is much greater.

Answer:

Answer E.

For a collision to be completely elastic, there must be NO LOSS in kinetic energy.

We can go through each answer choice:

A. Since the ball rebounds at half the initial speed, there is a loss in kinetic energy. This is NOT an elastic collision.

B. A collision involving sticking is an example of a perfectly INELASTIC collision. This is NOT an elastic collision.

C. A reduced speed indicates that there is a loss of kinetic energy. This is NOT elastic.

D. The balls traveling at half the speed after the collision indicates a loss of kinetic energy, making this collision NOT elastic.

E. This collision indicates an exchange of velocities, characteristic of an elastic collision. We can prove this:

Let:

m = mass of each ball

v = velocity

We have the initial kinetic energy as:

KE = \frac{1}{2}mv^2 + 0 = \frac{1}{2}mv^2KE=21mv2+0=21mv2

And the final as:

KE = 0 + \frac{1}{2}mv^2 = \frac{1}{2}mv^2KE=0+21mv2=21mv2

Answer:

E

Explanation:

hope this helps

Answer:A

Explanation: I think I am right

From the balanced equation of the reaction, the mole ratio of the reactants is 1:3.

Mole of 50.0 g \(Fe_2O_3\) = 50/160 = 0.3125 mol

Mole of 10.0 g CO = 10/28 = 0.3571 mol

Stoichiometric equivalent of  \(Fe_2O_3\) = 0.3571/3 = 0.1190 mol

In other words,  \(Fe_2O_3\) is in excess.

Excess mole = 0.3125 - 0.1190 = 0.1935 mol

Mass of 0.1935 mol \(Fe_2O_3\) = 0.1935 x 160 = 30.96 grams

Mole ratio of CO to Fe = 3:2

Equivalent mole of Fe that would be formed = 0.3571 x 2/3

                                                                          = 0.2381 mol

Mass of 0.238 mol Fe = 0.238 x 56 = 13.328 grams

Percent yield of Fe = 11.5/13.328 x 100 = 86.28%

Mole of 75 gk CO2 = 75000/44 = 1704.55 mol

Mole ratio of CO2 and Co = 1:1

Equivalent mole of CO = 1704.55 mol

Mass of 1704.55 mol CO = 1704.55 x 28 = 47.73 kg

80.7% = 47.73 kg

100% = 100 x 47.73/80.7

        = 59.14 kg

In other words, 59.14 kg of CO would be needed.

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Answer:

The speed of the wave is

v  = ( 240 )  ( 3.0 )= 720.0 m/s

Explanation:

If  n is the frequency of the wave  λ  is the wavelength of the wave.  v is the speed of the wave,

the three quantities are related by  v = n  λ    

We have, n = 240 Hz λ = 3.0 m v =?

I Hope This Makes Sense

The valency of magnesium is 2 because it has two valence electrons in its outermost shell. Magnesium belongs to the second group of the periodic table, which means it has two electrons in its outermost shell or valence shell. In order to achieve a stable configuration, magnesium tends to lose these two valence electrons to form a positively charged ion with a charge of 2+. This makes magnesium a bivalent or divalent element with a valency of 2.

Answer:

Because the outer shell of magnesium contains 2 atoms

A sample of gas has an initial volume of 5.6L at a pressure of 757mm Hg. If the volume of the gas is increased to 9.0L, then the pressure will be 438 mm Hg.

This empirical relationship, established in 1662 by physicist Robert Boyle, indicates that the pressure (p) of a given quantity of gas changes inversely with its volume (v) at constant temperature; in equation form, pv = k, a constant.

Given that,

initial volume (V₁) = 5.6 L

final volume (V₂) = 9.0 L

initial pressure (P₁) = 757 mm Hg

final pressure (P₂) = ?

As, we know

P₁V₁ = P₂V₂

now, putting the values:

757 mm Hg × 5.6 L = P₂ × 9.0 L

P₂ = 438 mm Hg

The pressure becomes:  438 mm Hg

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Awnser: The awnser would be (D) Thomas

Explanation:

Use Quizlet

Solid. Option D is correct

Matter is anthting that has weight and occupies space. The common states of matter that we have are the solid, liquid and gas.

Density is the ratio of mass of a substance to its volume. Among the three states of matter listed, solid state has the highest density due to its efficient packing structure of its molecules compared to liquid and gases.

Answer:

I think that option D is correct.

Explanation:

I think that option D is correct because it most have highest density.

Answer:

i the answer to your question should be C

Explanation:

Hope this helps!

The atomic mass of an element related to a mole in grams, is the mass of one mole of atoms. Therefore, option C is correct.

An atom's mass is its atomic mass. Although the kilogramme is the SI measure of mass, the unified atomic mass unit, or dalton, is a common way to express atomic mass. An unbound carbon-12 atom in its ground state has a mass of 112 of a Da.

A mass that is one-twelfth the mass of an atom of carbon-12 is known as an atomic mass unit. Any isotope of any element's mass is represented in terms of the carbon-12 reference standard.

The size of an atom is indicated by its atomic mass. Technically speaking, an atom's mass is the total weight of its protons, neutrons, and electrons.

Thus, option C is correct.

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Answer:

Therefore the theoretical density of iron is 7.877 g/cm³ .

Therefore the number of vacancy per cm³ is

Explanation:

The correct answer is "C.

The type of exercise that Mei is doing is the "Machine exercise."

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