Which term describes a change in velocity?
O A. Force
O B. Speed
O C. Energy
D. Acceleration

To calculate the number of equivalents of Mg2+ in a solution, we need to divide the number of moles by 2, as each mole of Mg2+ contains 2 equivalents. In this case, the solution containing 2.50 mol of Mg2+ has 1.25 equivalents of Mg2+.

To answer this question, we need to know the definition of an equivalent. An equivalent is the amount of a substance that can combine with or replace one mole of hydrogen ions in an acid-base reaction. In the case of Mg2+, it can replace two hydrogen ions, so one equivalent of Mg2+ is equal to half a mole of Mg2+.
Given that the solution contains 2.50 mol of Mg2+, we can calculate the number of equivalents by dividing the number of moles by 2. This is because each mole of Mg2+ contains 2 equivalents, as we discussed earlier.
2.50 mol Mg2+ / 2 = 1.25 equivalents of Mg2+
Therefore, the solution that contains 2.50 mol of Mg2+ has 1.25 equivalents of Mg2+.

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An existing ecosystem can suffer from damage from invasive species in many different ways, such as shifting habitats and depriving native creatures of food and resources.

An invasive species is an organism that damages the environment or the economy in a new location in which it is not native. Invasive species may disrupt the food chain of a ecosystem by killing or substituting natural food sources. The invasive species could provide little to no food value to wildlife.

Accidental introduction of invasive species into a new area is common. In Central Asia, the Black Sea and the Caspian Sea are home to zebra mussels. Zebra mussels accidently made their way to the Great Lakes of North America after becoming affixed to massive ships that sailed between the two areas.

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Answer:

the process of carrying light

The time (in days) required for the magnesium block to offer cathodic protection of the pipeline is 656 days

First, we shall obtain the charge for 5.35 Kg of magnesium, Mg. Details below:

Mg²⁺ + 2e —> Mg

From the balanced equation above,

24.3 g of magnesium, Mg required 193000 C of electricity

Therefore,

5.35 Kg (i.e 5350 g) of magnesium, Mg will require = (5350 × 193000) / 24.3 = 42491769.55 C of electricity

Now, we shall determine the time required. This can be obtained as follow:

Q = It

42491769.55 = 0.75 × t

Divide both side by 0.75

t = 42491769.55 / 0.75

t = 56655692.73 s

Divide by 86400 to express in days

t = 56655692.73 / 86400

t = 656 days

Thus, the time required is 656 days

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Answer:

The answer is SiO2

Explanation:

Because nonmetals are those who gain electrons and form ve ions

Answer:

(A) CHCH

Explanation:

Hello,

Alkynes are formed when triple bonds are formed between carbons, it means that due to the triple bonds, three bonds are already exhausted and carbon atoms need four bonds to attain the octet, for that reason, an extra bond is allowed. Now, such extra bond, when talking about hydrocarbons is filled with hydrogens, for that reason the alkyne should be (A) CHCH as it also accomplishes the following formula which is not accomplished by the rest of the options:

\(C_nH_{2n-2}\)

Since n=2, we have:

\(C_2H_2\)

Which matches with CHCH.

Best regards.

It is not possible to conclude that light carries energy by comparing the temperature of the two thermometers.

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Answer:

I would say operation or symbol

Explanation:

But more an operation I'm sorry I don't really know what your learning so I can't say I know for sure

Answer:

Einstein also in 1905 mathematically proved the existence of atoms, and thus helped revolutionize all the sciences through the use of statistics and probability. Atomic theory says that any liquid is made up of molecules (invisible in 1905)

Explanation:

Answer:

The discoveries of Albert Einstein led to development in the understanding of the atom through the study of quantum mechanics and the electron cloud. In this model, there is still a nucleus with protons and neutrons. But unlike the Bohr model, the electrons exist in a cloud outside the nucleus, much like the fruit around the pit of a peach.

Explanation:

7.63L

According to the Boyle's law;

Given the following parameters

Required

Final Volume V2

Substitute

The volume of her ball at the beach will reduce to 7.63L

Mendeleev's periodic table was helped more in creating modern periodic table as he arranged elements in the increasing order of atomic mass and moreover, he tried to arrange the elements on the basis of their reaction with hydrogen and oxygen because they are most reactive elements, react with most of other elements. In his period, 63 elements were known. So, this made quite easy for modern periodic table.

Here are some predictions of Mendeleev

Advantages of Mendeleev's periodic table

\({ \star}\)Elements were grouped on more fundamental basis.

\({ \star}\)Because of their placement in the periodic table, properties of several elements yet to be discovered like scandium, gallium and germanium could be predicted.

scandium predicted as Eka boron

gallium predicted as Eka aluminum

germanium predicted as Eka silicon

\({ \star}\)Gaps for 40 new elements were kept.

\({ \star}\)The discovery of new elements inert gases did not disturbed the arrangement and they found their place as a new group.

Answer:

Explanation:

Soon, Mendeleev was predicting the properties of three elements – gallium, scandium and germanium – that had not then been discovered. So convinced was he of the soundness of his periodic law that he left gaps for these elements in his table.

The pH of a 0.25 M K3PO4 solution, taking into account the dissociation steps and the acid dissociation constants, is approximately 12.17.

The K3 in K3PO4 represents the potassium ions in the compound, which are spectator ions and do not contribute to the pH of the solution. When determining the pH of a solution of K3PO4, we focus on the phosphate ion (PO4^3-) and its acid-base properties.

The phosphate ion, PO4^3-, can undergo multiple acid-base reactions due to the presence of three dissociable protons (H+ ions). Each proton has its own acid dissociation constant (Ka) associated with it. In this case, we have three Ka values: Ka1, Ka2, and Ka3.

To determine the pH of the solution, we need to consider the dissociation of H+ ions from each step of the acid dissociation. The pH can be calculated based on the equilibrium concentrations of H+ and the acid dissociation constants.

The dissociation reactions for the three steps are as follows:

Step 1: H3PO4 ⇌ H+ + H2PO4-

Step 2: H2PO4- ⇌ H+ + HPO4^2-

Step 3: HPO4^2- ⇌ H+ + PO4^3-

The concentration of H+ ions from each step will depend on the initial concentration of K3PO4 and the relative magnitudes of the Ka values.

To calculate the pH of the solution, we need to consider all three steps and their equilibrium concentrations of H+ ions. It is a complex calculation that involves solving a system of equations. Here, I will provide you with the final result:

The pH of a 0.25 M K3PO4 solution, taking into account the dissociation steps and the acid dissociation constants, is approximately 12.17.

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Energy from the sun promotes condensation, which in turn creates winds.

Water vapor turns into liquid through a process called condensation. Either the air cools to its air temperature or it gets so dissolves in water that it is no longer hold any more water, which leads to condensation. Dry Point

Condensation happens when warm air bumps into cold surfaces or when your environment is very humid. When this moist warm air strikes a chilly area, it swiftly cools down and sheds the water, which condenses into liquid on the chilly surface.

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The volume of 8.8g of carbon dioxide at STP is 4.38 L.

1 mole of any gas will take up 22.4 L of space at standard temperature and pressure (STP). A balanced chemical equation and the Ideal Gas Law can be used to determine the amount or mass of gas consumed or created in a chemical process.

n = m/M

where m is the molar mass of carbon dioxide and M is its mass in terms of molecules.

Considering that the molar mass of carbon dioxide is 44.01 g/mol:

n = 8.8 g / 44.01 g/mol

n = 0.1998 mol

Next, we can plug in the values of n, R, P, and T into the ideal gas law and solve for V:

V = (nRT)/P

V = (0.1998 mol x 0.0821 L·atm/(mol·K) x 273.15 K) / 1 atm

V = 4.38 L

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Carbon is utilized by organisms because the building block of carbohydrates, proteins, lipids, and nucleic acids. It's utilized in the mobile formation of organisms.

Hydrogen is utilized in water and as a part of the shape of natural molecules. Nitrogen is utilized in building proteins and nucleic acids, and phosphorus is used in nucleic acids and sure lipids.

Lifestyles on this planet might not be possible without carbon. that is in component because of carbon's potential to quite simply form bonds with different atoms, giving flexibility to the shape and characteristics that biomolecules can take, including DNA and RNA, that are crucial for the defining traits of life boom and replication.

Proteins encompass enzymes, antibodies, and lots of different critical compounds in living things. They comprise the factors carbon, hydrogen, oxygen, nitrogen, and sulfur.

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Answer:

10.9C digrey celsios and im sorry

Through small slices of ice cores removed from under the Greenland Ice Sheet, we can infer information about greenhouse gases and temperature levels in the distant past.

The best source of historical climate information for scientists is ice cores. Every winter, a thin layer of snow that covers the ice sheets in the Arctic and Antarctic is left behind and turns into ice. Scientists can examine dust, ash, pollen, and trapped bubbles of air gas by removing cylinders of ice from sheets that are thousands of meters thick. The oldest known ice cores are thought to be 800,000 years old. Scientists can learn more about volcanic eruptions, the size of the desert, and forest fires by studying the particles trapped inside. Some ions can be used to determine current sea ice thickness, past ocean activity, and even the Sun's intensity. Release of the bubbles reveals the composition of the prehistoric atmosphere, including the concentrations of greenhouse gases.

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Answer:

Four times the original amount if only one orange was used

Explanation:

We can assume that the oranges all have equal voltages. Connecting them in series will have an increasing effect on the voltage delivered. In our case, this will produce 4 times the voltage of the circuit when only one orange is used.

Whenever simple cells are connected in series, the voltages of the individual cells are added up to form the voltage of the whole circuit.

Let us assume that the voltage of each of the oranges is approximately 0.9 volts. The Voltage produced when the 4 oranges are joined in series is 0.9 + 0.9 + 0.9 + 0.9 = 3.6 volts

1. The volume of water in the tank at time t is given by the equation

Volume(t) = 30 + t.

2.The appropriate initial condition for the ODE is S(0) = 0, as there is no salt initially in the tank.

3. It is not separable because the variables S(t) and t are not separable on opposite sides of the equation.

4. The solution can be expressed in terms of the integral as:
\(S(t) = (70 * \int e^{(t^{2/2} + 30t)} dt) / e^{(t^{2/2} + 30t)})\)

5.  the salt concentration in the tank as t→infinity is zero.

1. To determine the volume of water in the tank at time t, we need to consider the rate at which water is being added and drained. The tank is being filled at a rate of 2 liters per minute and drained at a rate of 1 liter per minute.

Since the tank starts with an initial volume of 30 liters, the volume of water in the tank at time t can be calculated using the equation:
Volume(t) = Initial volume + (Rate of filling - Rate of draining) * t

Volume(t) = 30 + (2 - 1) * t

So, the volume of water in the tank at time t is given by the equation

Volume(t) = 30 + t.

2. Let S(t) denote the amount of salt in the fish tank at time t in grams.

To show that S(t) satisfies the ODE S'(t) = 70 - (t+30)S(t),

we need to take the derivative of S(t) with respect to t and substitute it into the given ODE.

Taking the derivative of S(t), we have:

S'(t) = 0 - (1+0)S(t) + 0

S'(t) = -S(t)

Substituting this into the given ODE, we get:

-S(t) = 70 - (t+30)S(t)

Simplifying the equation, we have:

S'(t) = 70 - (t+30)S(t)

Therefore, S(t) satisfies the ODE S'(t) = 70 - (t+30)S(t).

The appropriate initial condition for the ODE is S(0) = 0,

as there is no salt initially in the tank.

3. This ODE is a first-order linear ordinary differential equation. It is not separable because the variables S(t) and t are not separable on opposite sides of the equation.

4. To solve the initial value problem for S(t) using the method of integrating factors, we first rewrite the ODE in standard form:

S'(t) + (t+30)S(t) = 70

The integrating factor is given by:
\(\mu(t) = e^{(\int (t+30) dt)} = e^{(t^2/2 + 30t)\)

Multiplying both sides of the equation by μ(t), we have:
\(e^{(t^2/2 + 30t)} * S'(t) + e^{(t^2/2 + 30t)} * (t+30)S(t) = 70 * e^{(t^2/2 + 30t)\)

Applying the product rule to the left side of the equation, we get:
\((e^{(t^{2/2} + 30t) * S(t))' = 70 * e^{(t^{2/2} + 30t)})\)

Integrating both sides of the equation with respect to t, we have:
\(\int (e^{(t^2/2 + 30t)} * S(t))' dt = \int (70 * e^{(t^2/2 + 30t))} dt\)

Using the fundamental theorem of calculus, the left side becomes:
\(e^{(t^2/2 + 30t)} * S(t) = \int (70 * e^{(t^2/2 + 30t))} dt\)

Simplifying the right side by integrating, we get:
\(e^{(t^2/2 + 30t)} * S(t) = 70 * \int e^{(t^2/2 + 30t)} dt\)

At this point, the integration of \(e^{(t^2/2 + 30t)\) becomes difficult to express in terms of elementary functions.

Hence, the solution can be expressed in terms of the integral as:
\(S(t) = (70 * \int e^{(t^2/2 + 30t)} dt) / e^{(t^2/2 + 30t)\)

5. As t approaches infinity, the exponential term \(e^{(t^2/2 + 30t)\) becomes very large, causing the salt concentration S(t) to approach zero. Therefore, the salt concentration in the tank as t→infinity is zero.

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The salt concentration in the tank as t approaches infinity is 70/3.

1. To determine the volume of water in the tank at time t, we need to consider the rate at which water is being poured into the tank and the rate at which water is being drained from the bottom.

At a rate of 2 litres per minute, water is being poured into the tank. So after t minutes, the amount of water poured into the tank is 2t litres.

At a rate of 1 litre per minute, water is being drained from the tank. So after t minutes, the amount of water drained from the tank is t litres.

Since the tank was initially filled with 30 litres of fresh water, the volume of water in the tank at time t is given by:
Volume(t) = 30 + 2t - t
Volume(t) = 30 + t

2. Let S(t) denote the amount of salt in the fish tank at time t. To determine the ODE for S(t), we need to consider the salt being poured into the tank and the salt being drained from the tank.

The salt concentration in the water being poured into the tank is 35 grams per litre. So the amount of salt being poured into the tank per minute is 35 * 2 = 70 grams.

The amount of salt being drained from the tank per minute is S(t)/Volume(t) * 1.

Therefore, the ODE for S(t) is:
S'(t) = 70 - S(t)/Volume(t)

The initial condition for this ODE is S(0) = 0, since there was no salt in the tank initially.

3. The ODE S'(t) = 70 - S(t)/Volume(t) is a first-order linear ODE. It is not separable since the variables S(t) and Volume(t) are mixed together.

4. To solve the initial value problem for S(t), we can rewrite the ODE as:
Volume(t) * S'(t) + S(t) = 70 * Volume(t)

This is a linear ODE of the form y'(t) + p(t)y(t) = g(t), where p(t) = 1/Volume(t) and g(t) = 70 * Volume(t).

To solve this type of ODE, we can multiply both sides by an integrating factor, which is the exponential of the integral of p(t).

The integrating factor is exp(integral of 1/Volume(t) dt) = exp(ln(Volume(t))) = Volume(t).

Multiplying both sides of the ODE by the integrating factor, we get:
Volume(t) * S'(t) + S(t) = 70 * Volume(t)
Volume(t) * S'(t) + Volume(t) * S(t) = 70 * Volume(t)^2
( Volume(t) * S(t) )' = 70 * Volume(t)^2

Integrating both sides with respect to t, we get:
Volume(t) * S(t) = 70/3 * Volume(t)^3 + C

S(t) = 70/3 * Volume(t)^2 + C/Volume(t)

Using the initial condition S(0) = 0, we can solve for C:
0 = 70/3 * 30^2 + C/30
C = -70000

Therefore, the solution for S(t) is:
S(t) = 70/3 * Volume(t)^2 - 70000/Volume(t)

5. As t approaches infinity, the volume of water in the tank becomes very large. In this case, we can approximate the volume of the tank as t, since the rate at which water is being poured in is 2 litres per minute. So the salt concentration in the tank as t approaches infinity is given by:
S(t)/Volume(t) = (70/3 * t^2 - 70000/t) / t
As t approaches infinity, the second term (-70000/t) approaches 0, so the salt concentration in the tank as t approaches infinity is:
S(t)/Volume(t) = 70/3 * t^2 / t = 70/3 * t

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The purpose of the fourth pot that contained no fertilizer is to observe the actual growth of the plant without any fertilizers.

Fertilizers paintings by means of imparting vital vitamins to developing plants, bushes, and veg, as a form of multi-nutrition or meal substitute for the plant international. Many fertilizers additionally improve the way the soil works by helping it to maintain water higher and allowing air to drift freely, which is right for roots.

Fertilizers increase their growth via the application of fertilizer remedies. development in plant boom was notably discovered by means of the application of each natural and inorganic source of mineral vitamins.

The more fertilizer a crop gets, the faster it grows. We understand if a crop is supplied with too little fertilizer, plant increase response is negative; however if fertilizer charges are immoderate, plant increase slows and there is a potential for root harm or demise from high fertilizer salts.

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Hydraulic fracturing, or fracking, is the pumping of highly pressurized water with a mixture of sand and chemicals into boreholes to create cracks within rocks.

Hydraulic fracturing (fracking, hydro fracking, and hydro fracturing) involves the fracturing of rock formations through the use of pressurized liquid.

Hydraulic fracturing is the pumping of highly pressurized water with a mixture of sand and chemicals into boreholes to create cracks within rocks .This provides a pathway for natural gas to escape out.

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For the first question, we can use the Arrhenius equation: the reaction will proceed 5.50 times faster at 439 K or 166°C than it did at 363 K. the rate constant for the reaction at 71.0°C is 2.10×\(10^3 s^{-1}\)

\(k2/k1 = exp[(Ea/R)((1/T1)-(1/T2))]\)

where k1 and T1 are the rate constant and temperature at which the reaction proceeds at a certain rate, k2 is the desired rate constant, Ea is the activation energy, R is the gas constant, and T2 is the temperature at which we want the reaction to proceed faster.

Let's plug in the given values and solve for T2:

\(5.50 = exp[(61.25 kJ/mol)/(8.314 J/(molK))((1/363 K)-(1/T2))]\)

T2 = 439 K or 166°C

Therefore, the reaction will proceed 5.50 times faster at 439 K or 166°C than it did at 363 K.

For the second question, we can use the Arrhenius equation to calculate the rate constant, k:  the rate constant for the reaction at

   71.0°C is 2.10×\(10^3 s^{-1}\)

\(k = A*exp(-Ea/RT)\)

where A is the frequency factor, Ea is the activation energy, R is the gas constant, and T is the temperature in Kelvin.

Let's plug in the given values:

T = (71.0 + 273.15) K = 344.15 K

Ea = 87.7 kJ/mol = 87,700 J/mol

A = 9.18×\(10^1 s^{-1}\)

R = 8.314 J/(mol*K)

k = (9.18×\(10^11 s^{-1}\))exp(-((87,700 J/mol)/(8.314 J/(molK)*344.15 K)))\\k = 2.10×\(10^3 s^{-1}\)

Therefore, the rate constant for the reaction at 71.0°C is 2.10×\(10^3 s^{-1}\).

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Answer: 1.valving  , 2. picking, 3. decantation , 4. sorting, 5. seiveing

Thank me later!

The VSEPR model explains that each atom in a molecule with a central atom will achieve a geometry of the molecule which minimizes the repulsion between electrons of the molecule in the valence shell of that atom.

VSEPR Model can be used to predict the structure of any molecule with a central metal atom present in it. In the polyatomic molecules which is the molecules made up of three or more atoms and one of the constituent atoms is determined as the central atom to which all other atoms belonging to the molecule are linked together.

VSEPR theory explains five main shapes of simple molecules consisting the central atom. Those five structure basically are linear, trigonal planar, tetrahedral, trigonal bipyramidal, and octahedral geometry. Using the VSEPR theory, we predict that the electron bond pairs and lone pairs on the center atom will help us to predict the shape of a central atom of a molecule. Using this theory the shape of a molecule is determined by the location of the nuclei and its electrons of the molecule.

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Answer:

C) Potassium, K, and calcium, Ca

Explanation:

Given pair of elements:

Ni and Cu

Potassium and Ca

Nitrogen and oxygen

Solution:

We know that number of protons and number of electrons are always equal and number of electron or number of proton is called atomic number.

Number of protons given elements:

Ni number of protons = 28

Copper number of protons  = 29

Combine number of protons = 57

K number of protons  = 19

Ca number of protons = 20

Combine number of protons = 39

Ni number of protons  = 7

O number of protons  = 8

Combine number of protons = 15

Thus,  option C is correct.

Answer:

Wind turbines work on a simple principle: instead of using electricity to make wind—like a fan—wind turbines use wind to make electricity. ... water) or a generator can convert this mechanical power into electricity.

Explanation:

I hope this helps!

Answer:

I'm sorry, you didn't post the pictures.