The daily change from daylight to darkness is caused by:

Answer:

a atoms

Explanation:

Answer:

C. 8.55 atoms

Explanation:

Answer:

(1) Nuclear reactions entail a transition in the nucleus of an atom, which normally results in the formation of a new substance. Chemical reactions, on the other hand, only involve electron rearrangement and do not involve nuclei modifications. (4) Nuclear reactions are unaffected by the element's chemical form.

Explanation:

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Answer:

the oxidizing agent undergoes oxidation and

the reducing agent undergoes reduction simultaneously

Answer:

methylpentanoic acid,,,,,I guess so

The following carboxylic acid is 2-methylpentanoic acid.

A carboxylic acid is an organic compound that contains the carboxyl functional group. The general formula for a carboxylic acid can be abbreviated as R−COOH.

Pentanoic acid can be prepared by reacting a butyl halide with magnesium to obtain a Grignard reagent, which is further reacted with carbon dioxide to give valeric salt.

Hence, the following carboxylic acid is 2-methylpentanoic acid.

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By increasing the frequency which changes the wavelength,  frequency changes across the electromagnetic spectrum, from radio waves to gamma rays.

The electromagnetic spectrum is a wide range of frequencies that vary depending upon the wavelength of the spectrum and somehow the energy of photons also affects the frequencies and wavelengths.

There are three types of electromagnetic spectrum hydrogen spectrum emission spectrum due to the emission of light and absorption spectrum due to absorption of light.

Therefore, frequency changes across the electromagnetic spectrum, from radio waves to gamma rays are By increasing the frequency which changes the wavelength.

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Answer:

C

Explanation:

Answer:

D)

Explanation:

On land, volcanoes form when one tectonic plate moves under another. Usually a thin, heavy oceanic plate subducts, or moves under, a thicker continental plate. When this happens, the ocean plate sinks into the mantle.

Answer:

what is the gas that is produced.

Answer:

Generally, all atoms of elements contain three sub-atomic particles- Protons(Positively-charged), Neutrons(Neutral) and Electrons(Negatively-charged).

The Magnitude of the Positive Charge possessed by the Protons and the Magnitude of the Negative Charge possessed by the Electrons cancel each other, which make the atom electrically neutral.

Hence,

Without any electrons, the magnitude of the positive and negative charges wouldn't balance, and the atom would be unstable and disintegrate almost immediately. Hence, all stable atoms should have electrons revolving around them, where the number of protons and electrons are the same, under normal conditions.

To Conclude,

Every atom of an element will have electrons arranged in different shells, or matter couldn't exist without electrons.

Answer:Switch off lighting in refrigeration areas when not in use?

Explanation:

Answer:

Of course the answer is gold

Explanation:

Gold is used for making jewellery and not aluminium,iron or copper

Answer:

copper or gold.

Explanation:

Copper is also a good material for accessories. Even in the ancient times, those who can’t afford gold jewelry wear copper jewelry instead. It offers design flexibility too due to its high ductility.

Answer:

[tex]100 \times 13.5 = ikw n bahaa[/tex]

IKAW na mag tayms

Answer:

B) Crust

Explanation:

It's the farthest layer from the core listed.

Answer:

B) Crust

Explanation: it is the lowest from the center of the earth.

Answer:

A pure substance is a substance or an element whose impurities are extracted by concentration by chemical means.

e.g Aluminium is made pure by concentration of it's ore, bauxite by treatment with excess Sodium Hydroxide solution.

Answer:

Answered below

Explanation:

>> ice is solid

>> water is liquid

>> Steam is gas

>> Ice → water = melting

>> water → steam = evaporation

>> steam → water = condensation

>> water → ice = freezing

Answer: pls mark brainliest

Explanation: i think so its D

Answer:

alcohol

Explanation:

Answer:

11

Explanation:

Sodium is a chemical element with the symbol Na and atomic number 11.

Answer:

22.99g/mol (in this case 23g/mol)

Answer:

ph=5.2 solution is acidic

Answer:

False

Explanation:

False : It is better they are closer together

The RF ( retention factor  ) is calculated with this formula

= distance travelled / distance travelled by solvent

And the larger the RF factor of a compound the less polar the compound ( i.e. it will not stick to the stationary phase ) hence it is better the RF values of the components to be closer

Answer:

True

Explanation:

The resulting Rf factor, which has no units, is dependent upon the specific stationary and mobile phase used. Chromatogram results are considered to have better resolution if the Rf values of the components being separated are farther apart (e.g. 0.3 and 0.7) rather than closer together (e.g. 0.4 and 0.5). The distance the compound moves relative to the distance the solvent (or mobile phase or eluent) moves is a characteristic of that compound. (where Rf is equal to distance compound moved divided by solvent front distance)

Answer:

Na2SO4

Explanation:

Na2SO4 dissociates completely in solution to yield ions therefore it is the strongest electrolyte.

The question is incomplete as the table is missing but I will try to explain as generally as possible. Recall that an electrolyte is a compound that conducts electricity in solution.

Also recall that the number of ions available in solution determines the electrolytic strength of a substance. Hence, Na2SO4 dissociates completely in solution to yield ions therefore it is the strongest electrolyte.

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Answer:

I think hydrogen because Hydrogen combined with one atom with oxygen and in hydrogen peroxide. It has two atoms of hydrogen and 2 atoms of oxygen. Therfore it should be a compound.

Answer:

0.46 J/g degrees C, Iron

Explanation:

16.1 J = 5 g x c x 7 degrees C

c = 16.1 / 5 x 7 = 0.46

Answer: 0.46 J/g degrees C, Iron

In the case when the HCI should be added so it should be shifted to reactants.

It is the solution that should be considered as the aqueous solution that comprise of the mixture of the weak acid and the conjugate base.

Here the ph level should be change very less at the time when the small amount of the strong acid should be added.

Therefore, it  should be shifted to reactants.

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Answer:

Hydroelectric pumped storage can be used to eliminate the conditional nature of wind and solar energy. At times of peak production of energy from either solar or wind (during summer and windy days), the excess electrical energy produced can be stored using hydroelectric pumped storage methods. When conditions no longer favour energy production from either wind or solar sources, these stored energy can then be regenerated for use.

Explanation:

Pumped-storage hydroelectricity is a type of hydroelectric energy storage used by electric power systems to store excess electrical power during periods of low demand for later release at periods when demand for energy rises again. It stores energy in the form of gravitational potential energy of water, pumped from a lower level reservoir to a higher level reservoir.

At times of low electrical demand, excess generated energy is used to pump water into the upper reservoir. When there is higher demand, water is released back into the lower reservoir through a turbine, generating electricity.

This form of energy storage is useful in circumventing the conditional nature of renewable energy sources such as wind and solar energy. At times of peak production of energy from either solar or wind (during summer and windy days), the excess electrical energy produced can be stored using hydroelectric pumped storage methods. When conditions no longer favour energy production from either wind or solar sources, these stored energy can then be regenerated for use.

Answer:

pH = 6.999

The solution is acidic.

Explanation:

HBr is a strong acid, a very strong one.

In water, this acid is totally dissociated.

HBr + H₂O  →  H₃O⁺  +  Br⁻

We can think pH, as - log 7.75×10⁻¹² but this is 11.1

acid pH can't never be higher than 7.

We apply the charge balance:

[H⁺] = [Br⁻] + [OH⁻]

All the protons come from the bromide and the OH⁻ that come from water.

We can also think [OH⁻] = Kw / [H⁺] so:

[H⁺] = [Br⁻] + Kw / [H⁺]

Now, our unknown is [H⁺]

[H⁺] =  7.75×10⁻¹² + 1×10⁻¹⁴ / [H⁺]

[H⁺] = (7.75×10⁻¹² [H⁺] + 1×10⁻¹⁴) /  [H⁺]

This is quadratic equation:  [H⁺]² - 7.75×10⁻¹² [H⁺] - 1×10⁻¹⁴

a = 1 ; b = - 7.75×10⁻¹² ; c = -1×10⁻¹⁴

(-b +- √(b² - 4ac) / (2a)

[H⁺] = 1.000038751×10⁻⁷

- log [H⁺] = pH → 6.999

A very strong acid as HBr, in this case, it is so diluted that its pH is almost neutral.