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3 years ago

HELP PLEASE I DONT KNOW WHAT THIS MEANS IM CONFUSED

Chemistry

1 answer:

Zielflug [23.3K]3 years ago

5 0

Explanation:

In an alpha emission, an alpha particle is ejected from a large nucleus. An alpha particle is simply a helium nucleus (atomic number is 2 and mass number is 4) so that means that the atomic number of the emitting nucleus decreases by 2 and its mass number decreases by 4.

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We observe a distant object in space and see that the spectral lines for hydrogen in the object's light appear at a shorter wave

MrMuchimi

Answer:

This tells us the radial velocity of the object and that the object is approaching or coming towards us.

Explanation:

Certain chemicals radiate with particular wavelengths or colors when their temperature is raised or when they are charged electrically. Also observable are dark strokes separating the spectrum known as absorption lines

These spectral lines of chemicals are well known as stated above and from the phenomenon of Doppler effect, spectroscopy can be used to detect the movement of a distant object by the change of the emitted frequency of the wavelength

The Doppler effect is used in calculating the radial velocity of a distant object due to the fact that an approaching object compresses its emitted signal wavelength while a receding object has a longer wavelength than normal

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3 years ago

Which statement best relates the strength and concentration of a base? At high enough concentrations, a weak base becomes strong

Lorico [155]

Answer: Option (b) is the correct answer.

Explanation:

When there are more number of hydroxide ions in a solution then there will be high concentration of $OH^{-}$ or hydroxide ions. As a result, more will be the strength of base in that particular solution.

A base is strong when it readily dissociate into its ions in the solution. When a base is strong, then it does not matter at what concentration it is dissolved in the solution because despite of its low concentration it will remain a strong base.

Thus, we can conclude that out of the given options, the statement even at low concentrations, a strong base is strong best relates the strength and concentration of a base.

6 0

3 years ago

Read 2 more answers

How do I Balancing Chemical Equations

Black_prince [1.1K]

Answer:

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Explanation:

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3 years ago

What are the cellulose and ligin are changed int other substances

slava [35]

WAit I just have one tiny little question did your mom dad grandma grandpa helpful I with the question first

3 0

3 years ago

The table shows the number of reactants and products present during two separate chemical reactions.

aleksandr82 [10.1K]

Answer: Option (a) is the correct answer.

Explanation:

A decomposition reaction is defined as a reaction where a compound dissociates into two or more atoms.

For example, $A \rightarrow B + C + D$

Whereas a chemical reaction in which two reactants combine together to result in the formation of a compound is known as a synthesis reaction.

For example, $A + B \rightarrow C$ is a synthesis reaction.

Thus, we can conclude that the statement chemical reaction A, because the reactant is a compound identifies the decomposition reaction and describes a substance is involved.

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4 years ago