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3 years ago

SCIENTISTS CAN USE SPECTRA ANALYSIS OF STARS TO DETERMINE WHICH OF THE FOLLOWING? SELECT ALL THAT APPLY

Chemistry

1 answer:

monitta3 years ago

4 0

All of the above

Explanation:

Scientists can use spectra analysis of stars to determine:

Surface temperature of the star
Core temperature of stars
Elements in the core of the star
Elements on the surface of the star

Spectra analysis is the analysis or interpretation of the electromagnetic emissions from a matter.

They are very useful in indirect and descriptive studies of astronomical bodies since it might be very difficult of come in close contact with them.

Emissions spectrum typifies every matter in nature since all bodies emits specific radiations.

Using spectra analysis, scientists can determine the temperature that typifies an emission and the elements that might might be producing such signatures.

learn more:

Spectral analysis brainly.com/question/1857156

#learnwithBrainly

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Density (D) is defined as the ratio of mass (m) to volume (V) and can be determined from the expression D = . Find the density o

olchik [2.2K]

Explanation:

87.329 g/32.32 cm³ = 2. 70 g/cm³

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3 years ago

In an aqueous solution, 42% of a substance dissociates to release hydronium ions. Which of the following statements is true for

const2013 [10]

Answer: The statement it is a weak acid is true for the substance.

Explanation:

An acid that dissociates completely when dissolved in water to give hydrogen $(H^{+})$ or hydronium $(H_{3}O^{+})$ ions is called a strong acid.

For example, HCl is a strong acid.

$HCl + H_{2}O \rightarrow H_{3}O^{+} + Cl^{-}$

An acid that dissociates partially or weakly when dissolved in water to given hydrogen or hydronium ions is called a weak acid.

For example, $CH_{3}COOH$ is a weak acid.

$CH_{3}COOH \rightleftharpoons CH_{3}COO^{-} + H_{3}O^{+}$

A strong base is a base which when dissolved in water then it dissociates completely to give hydroxide ions.

For example, NaOH is a strong acid.

A weak base is a base which when dissolved in water then it dissociates partially or weakly to give hydroxide ions.

For example, $NH_{3}$ is a weak base.

Hence, in an aqueous solution where 42% of a substance dissociates to release hydronium ions shows that the dissociation is less than 50%. This means that substance is dissociating weakly so, it is a weak acid.

Thus, we can conclude that the statement it is a weak acid is true for the substance.

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3 years ago

What are you and what do you want with my attendance

Lelu [443]

Answer:

Such a waste of points but lol

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3 years ago

Pls help! I'll give u 10 points and the brainlest answer!!!

alekssr [168]

Answer:

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Explanation:

the lower the more fuel there is

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Answer:

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Explanation:

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