Help quickly pleaaas

Answer:

c

Explanation:

The ball of 21.7 kg which is located on a shelf 1.6 m above ground is having a mechanical energy in the form of potential energy. Hence, C best describes the energy of the ball.

Potential energy is the energy stored on it when the object is at rest. Kinetic energy of an object is generated by virtue of its motion. When a body starts moving its potential energy starts converts to kinetic energy.

The sum of kinetic and potential energy of an object is called its mechanical energy. An object has mechanical energy in the form of kinetic energy when it is at rest. When it starts to move its potential energy converts to kinetic energy.

Therefore, the ball of 21.7 kg placed in the shelf of height 1.6 m has a potential energy as long as it stays there on the shelf. Its potential energy = mgh

p = 21.7 kg × 9.8 m/s² × 1.6 m = 340.25 J

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Answer:

A = water has high surface tension

the answer is a hope this helps and plz give me brainlist :)

Answer:

n physical sciences, subatomic particles are smaller than atoms. They can be composite particles, such as the neutron and proton; or elementary particles, which according to the standard model are not made of other particles. Particle physics and nuclear physics study these particles and how they interact.

Explanation:

a particle smaller than an atom (e.g., a neutron) or a cluster of such particles (e.g., an alpha particle).

Answer:

The volume of solution in liters required to make a 0.250 M solution from 3.52 moles of solute is 14.08 liters of solution

Explanation:

The question relates to the definition of the concentration of a solution which is the number of moles per liter (1 liter = 1 dm³) of solution

Therefore we have;

The concentration of the intended solution = 0.250 M

Therefore, the number of moles per liter of the required resolution = 0.250 moles

Therefore, the concentration of the required solution = 0.250 moles/liter

The volume in liters of the required solution that will have 3.52 moles of the solute is given as follows;

The required volume of solution = The number of moles of the solute/(The concentration of the solution)

∴ The required volume of solution = 3.52 moles/(0.250 moles/liter) = 14.08 liters

The required volume of solution to make a 0.250 M solution from 3.52 moles of solute = 14.08 liters.

Therefore the number of liters required to make a 0.250 M solution from 3.52 moles of solute = 14.08 liters.

Answer:

fuse

Explanation:

fuses are made by metal alloys , have low melting point

Answer:

Moving water helps plant's and islands form and grow. Which shapes earth.

Answer:

DONT CLICK THAT LINK THAT IS HACK AND VIRUS

Explanation:

Answer:

Yes, a reaction occurs

Explanation:

net ionic equation

Mn 2+ (aq) + S 2- (aq) --> MnS (s)

Answer:

An Arrhenius acid is a substance that associates in water to form hydrogen irons (H+) In other words an acid increases the concentration of H+ ions in an aqueous solution

I think the answer is: C. An endothermic reaction that decreases in entropy

An endothermic reaction that decreases in entropy. Hence, option C is correct.

Entropy is the energy of a system that is unuseful to do work.

For a reaction to be spontaneous, the Gibbs' Free Energy must be negative.

The equation for Gibbs Free energy is given by:

G= H-TS

Where, G = Gibbs free energy

H = Enthalpy of the reaction

T = Temperature of the system

S = Entropy of the system

Sign convention for all the quantities:

For H: It is negative for exothermic reactions and positive for endothermic reactions

For S:  It is positive when there is an increase in entropy and it is negative when there is a decrease in entropy.

If we want G to be negative, the conditions necessary are:

G= (-ve) - (+ve) = -ve

The product of temperature and entropy must be positive and that will be positive when there is increase in entropy at any temperature.

Hence, option C is correct.

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Answer:

anode: magnesium

cathode: nickel

Explanation:

edg. 2021

Answer:

Q 1: Why did the man get sick but not his children? Why did he use a cube?

Q 2: By knowing how he heated the water and everything we can infer what happened to him and not his children.

Explanation:

Hope this helps! plz mark brainliest <3

Answer:

Ill just comment this for fun So he can get brainliest since u need 2 comments for that

Answer:

true

Explanation:

Answer:

b. trueeeeeeeeeeeeeeeeeeeeeeeeeeee

Answer:

The magnitude of the threat to the ecosystem is linked to human population size and resource use per person. Resource use, waste production and environmental degradation are accelerated by population growth.

Answer:

when dissolved in water they dissociate in anion and H+ cation.

Explanation:

When dissolved in water, acids donate hydrogen ions (H+). Hydrogen ions are hydrogen atoms that have lost an electron and now have just a proton, giving them a positive electrical charge. Bases, on the other hand, mixed with water yield hydroxide ions (OH-).

Answer:

minimizing the use of cars can help save the ozone layer by ​Minimizing the amount of gasoline which damages the ozone layer.

therefore the ozone layer is preserved.

have a nice day.

Answer:

Standard notation: 49,244 km

Scientific notation: 4.92x10⁴ km

Explanation:

The diameter of Neptune in standard notation is:

49,244 km

In the standard notation, we write the result in a normal way.

Now, to express the diameter in scientific notation we need to use a base ten power as follows:

4.92x10⁴ km

In the above result, the positive exponent indicates that the number is larger. The decimal point is located near the first digit.    

Therefore, the diameter of Neptune in standard notation is 49,244 km and in scientific notation is 4.92x10⁴ km.

I hope it helps you!

Answer:

1.The substance(s) to the left of the arrow in a chemical equation are called reactants. A reactant is a substance that is present at the start of a chemical reaction. The substance(s) to the right of the arrow are called products . A product is a substance that is present at the end of a chemical reaction.The combustion of methane or octane is exothermic; it releases energy. CH4 + 2 O2 → CO2 + 2 H2O + energy The energies of the products are lower than the energiies of the reactants.

Explanation:

Answer:

the immage is not uploaded

Answer:

Answer 4. C and D also known as "Gravity of the Sun and Moon work against each other "

"Moon and Sun are at right angles to the Earth"

Answer 5. A and D also known as "Revolution is when an object travels in a path around another." "Rotation is when an object spins around its axis"

Answer 6. It is elliptical

Answer 7. It takes a year. It takes a day

Answer 8. False

Answer 9. The tilt of the earth's axis towards the sun allows those parts of the earth to have more sunlight.

Answer 10. True

Answer:

pH = 2.462.

Explanation:

Hello there!

In this case, according to the reaction between nitrous acid and potassium hydroxide:

[tex]HNO_2+KOH\rightarrow KNO_2+H_2O[/tex]

It is possible to compute the moles of each reactant given their concentrations and volumes:

[tex]n_{HNO_2}=0.02000L*0.1000mol/L=2.000x10^{-3}mol\\\\n_{KOH}=0.1000mol/L*0.01327L=1.327x10^{-3}mol[/tex]

Thus, the resulting moles of nitrous acid after the reaction are:

[tex]n_{HNO_2}=2.000x10^{-3}mol-1.327x10^{-3}mol=6.73x10^{-4}mol[/tex]

So the resulting concentration considering the final volume (20.00mL+13.27mL) is:

[tex][HNO_2]=\frac{6.73x10^{-4}mol}{0.01327L+0.02000L} =0.02023M[/tex]

In such a way, we can write the ionization of this weak acid to obtain:

[tex]HNO_2+H_2O\rightleftharpoons NO_2^-+H_3O^+[/tex]

So we can set up its equilibrium expression to obtain x as the concentration of H3O+:

[tex]Ka=\frac{[NO_2^-][H_3O^+]}{[HNO_2]}\\\\7.1x10^{-4}=\frac{x^2}{0.02023M-x}[/tex]

Next, by solving for the two roots of x, we get:

[tex]x_1=-0.004161M\\\\x_2=0.003451M[/tex]

Whereas the correct value is 0.003451 M. Finally, we compute the resulting pH:

[tex]pH=-log(0.003451)\\\\pH=2.462[/tex]

Best regards!

Answer:

It's temperature drops, and if releases thermal energy

Answer:

Its temperature drops

Answer:

The densest ocean water is formed in two primary locations near the poles, where the water is very cold and highly saline as a result of ice formation. The densest deep water mass is formed in the Weddell Sea of Antarctica, and becomes the Antarctic Bottom Water (AABW).

Explanation:

The densest ocean water is formed in two primary locations near the poles, where the water is very cold and highly saline as a result of ice formation. The densest deep water mass is formed in the Weddell Sea of Antarctica, and becomes the Antarctic Bottom Water (AABW).

Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Therefore, north Atlantic Ocean is the region of Atlantic Oceans where dense waters will likely sink.

Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.

Mathematically,

Density = Mass of the metal ball ÷volume marked on the graduated cylinder

North Atlantic Ocean is the region of Atlantic Oceans where dense waters will likely sink. Here, water is very cold and salty which makes the water denser.

Therefore, north Atlantic Ocean is the region of Atlantic Oceans where dense waters will likely sink.

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Answer:

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