I need y’all’s help please

Answer:

mechanical energy to electrical energy

Explanation:

The water turns the turbine with produces mechanical energy so the generator converts it to electrical energy

Answer:

A

Explanation:

A spontaneous reaction doesn't require any addition of heat.

The rest of the choices require a transfer of heat energy.

Answer:

Is by comparing the energy absorbed when bonds in the reactants are broken with the energy released when bonds in the products are formed, you can determine whether a chemical reaction releases energy or absorbs energy overall. Chemical reactions that release energy are called exothermic

Answer:

Explanation:

Wind is more of an efficient power source than solar. Compared to solar panels, wind turbines release less CO2 to the atmosphere, consume less energy, and produce more energy.

Answer:

Explanation:

The pH of a solution can be found by using the formula

[tex]pH = - log ([ {H}^{+} ])[/tex]

From the question

[H+] = 0.045 M

We have

[tex]pH = - log(0.045) \\ = 1.346787...[/tex]

We have the final answer as

Hope this helps you

Answer:

1.35

Explanation:

Answer:

The temperatures on Earth increase

Explanation:

more energy results in more heat.

Mark me Brainliest..... ......

Answer:

Probably around 6 because the ph of hydrochloric acid is 3

Explanation:

Answer:

A. 1:1

Explanation:

The ratio of metal cationic (+) atom to nonmetal anionic (-) atom in the sodium and bromine compound is 1:1 because sodium needs to lose one electron and bromine needs one electron to become stable and complete its outermost shell. When sodium lose electron, it become cation and gain +1 charge while on the other hand, the bromine accept one electron and become anion and gain -1 charge so that's why we can say that there is 1:1 of metal cationic (+) atom to nonmetal anionic (-) atom in the sodium and bromine compound.

Answer:

It's (D)

Explanation:

Most acids taste sour, conduct electricity when dissolved in water, turn blue litmus

Most acids taste sour, conduct electricity when dissolved in water, turn blue litmuspaper red, but not all of them. Some acids taste bitter, others sweet and some simply delicious.

Most acids taste sour, conduct electricity when dissolved in water, turn blue litmuspaper red, but not all of them. Some acids taste bitter, others sweet and some simply delicious.Silicic acid is tasteless, is not soluble in water, does not conduct electricity, does not turn blue

Most acids taste sour, conduct electricity when dissolved in water, turn blue litmuspaper red, but not all of them. Some acids taste bitter, others sweet and some simply delicious.Silicic acid is tasteless, is not soluble in water, does not conduct electricity, does not turn bluelithmus paper red, since it merely does not dissociate in water. The only correct option is D

Answer:

There is ionic bonding between Mg2+ ions and NO3− ions. Which of the following claims about a binary compound in which the bonding is ionic is most likely to be scientifically valid? Both elements in the compound are metals.

Answer:

The answer is D.

Explanation:

A: not correct: one element is a metal and the other is a non-metal.

B: not correct: Fr could be combined with Cl

C: not correct: They are transferred not shared.

D: correct: Non-metals have a higher electronegativity in comparison to the metals with a low electronegativity which results in a great change in electronegativity.

Answer:

1. Hot air rises and cold air descends for exactly the same reason

Matter are anything that is made up of atoms. The quantity of matter can be seen only on the basis of mass and volume calculation. Therefore, warm air rise and cold air sink.

Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science.

Matter is anything that is made up of atoms. Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter.

Warm air rises while cold air descends. This is because hotter air takes more energy than cooler air. Furthermore, hot and cold temperatures are precisely proportionate to their density. As a result, when it's really hot, the hotter air is more likely to rise than when it's very cold.

Therefore, warm air rise and cold air sink.

To learn more about matter, here:

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Answer: Because fresh water is constantly be evaporated from the ocean and then replaced by rivers, the salinity of the oceans remains balanced.

Explanation:

When evaporation takes place in sea water then of course there will occur an increase in salinity.

But as this evaporated water is replaced by water coming from rivers. As a result, the raising salinity is counter balanced by the water coming from rivers.

Hence, salinity remains balanced in sea water.

Thus, we can conclude that because fresh water is constantly be evaporated from the ocean and then replaced by rivers, the salinity of the oceans remains balanced.

Answer:

B. 4Na + O2 → 2Na2O

Explanation:

Got it right on the test :)

For balanced  equation the mass of reactant is exactly equal to the mass of product. atoms of reactant equal to the atoms of product is called as balanced equation.

The law of conservation of mass, which states that "the total mass of all the products of reaction in a chemical reaction is equal to the total mass of all the reactants," is satisfied by balancing chemical equations.

A balanced chemical equation, in which the masses of the reactants and products are equal, contains the same amount of atoms of each element on both sides of the equation.

4Na + O₂ ⇒  2Na₂O₂

In this reaction in reactant there are four number of sodium atom and in product also four number of sodium atom. Similarly total number of oxygen at reactant is equal to the total number of oxygen at product.

Thus, option B is correct.

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Answer:

The relative molecular mass of ammonium nitrate is 80 gm

Explanation:

[tex]M_{NH4NO3}[/tex] = 14 + (4 × 1) + 14 + (16 × 3) = 80 (gm)

Answer:

[tex]Al_2(SO_4)_3+3Mg(NO_3)_2\rightarrow 2Al(NO_3)_3+3MgSO_4[/tex]

Explanation:

Hello there!

In this case, for the given reactants side, we infer this is a double replacement reaction because all the cations and anions are switched around as a result of the chemical change, we infer that the products side include aluminum with nitrate and magnesium with sulfate as shown below:

[tex]Al_2(SO_4)_3+Mg(NO_3)_2\rightarrow Al(NO_3)_3+MgSO_4[/tex]

However, we need to balance since unequal number of atoms are present at both sides, thus, we do that as shown below:

[tex]Al_2(SO_4)_3+3Mg(NO_3)_2\rightarrow 2Al(NO_3)_3+3MgSO_4[/tex]

Thus, we make 6 Al atoms, 3 S atoms, 3 Mg atoms and 30 O atoms on each side in agreement with the law of conservation of mass.

Regards!

Answer:

C

Explanation:

Answer:

Sorry I really don't know but can you help with one of my question I posted please thanks.

D melting ice cream because if u know what a physical change is its a change that you can reverse chimical change are changes you cant reverse so u can freeze back ice cream so :D

so the other guy can have branliest have a wonderful summer guys! :)

Answer:

3.45 L

Explanation:

Temperature and volume are linearly related (when one increases or decreases, so does the other).

Convert the temperature to Kelvin:

50 °C = 323 K

100 °C = 373 K

To find the rate of change, divide 373 by 323 to get roughly 1.15

Multiply the amount of liters by this factor to get your answer

Answer:

Conservation of resources. Saving energy and helping reduce carbon emission.

Explanation:

Explanation:

One atom of carbon (2.4) combines with two atoms of oxygen (2.6) to form the compound carbon dioxide CO2 (only the outer shell of carbon's electrons are shown). ... The carbon dioxide molecule is held together by the strong C=O. carbon–oxygen double covalent bonds by sharing electrons.

Answer:

Very true

Explanation:

Answer: The value of equilibrium constant, K, is [tex]7.74 \times 10^{-4}[/tex].

Explanation:

The reaction equation is as follows.

[tex]2SO_{3}(g) \rightleftharpoons 2SO_{2}(g) + O_{2}(g)[/tex]

Now, the expression for equilibrium constant of this reaction is as follows.

[tex]K = \frac{[SO_{2}]^{2}[O_{2}]}{[SO_{3}]^{2}}[/tex]

Substitute the given values into above expression as follows.

[tex]K = \frac{[SO_{2}]^{2}[O_{2}]}{[SO_{3}]^{2}}\\= \frac{(\frac{0.210}{15.4})^{2} \times (\frac{0.354}{15.4})}{(\frac{8.51 \times 10^{-2}}{15.4})}\\= 7.74 \times 10^{-4}[/tex]

Thus, we can conclude that the value of equilibrium constant, K, is [tex]7.74 \times 10^{-4}[/tex].

Explanation:

The new pressure can be found by using the formula for Boyle's law which is

[tex]P_1V_1 = P_2V_2 \\[/tex]

Since we're finding the new pressure

[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]

We have

[tex]P_2 = \frac{25 \times 1}{125} = \frac{25}{125} = \frac{1}{5} = 0.2 \\ [/tex]

We have the final answer as

Hope this helps you