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11Alexandr11 [23.1K]
3 years ago
5

How many elements are in 2CaCO3 and C8H10N402

Chemistry
1 answer:
Ilia_Sergeevich [38]3 years ago
3 0

Answer:

In 2CaCO3 there is 3 elements.

In C8H10N402 there is 3 elements.

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Which of the following would you except to see in the death of a star that is less than 0.5 solar mass
Ket [755]

B. White Dwarf.

<h3>Explanation</h3>

The star would eventually run out of hydrogen fuel in the core. The core would shrink and heats up. As the temperature in the core increases, some of the helium in the core will undergo the triple-alpha process to produce elements such as Be, C, and O. The triple-alpha process will heat the outer layers of the star and blow them away from the core. This process will take a long time. Meanwhile, a planetary nebula will form.

As the outer layers of gas leave the core and cool down, they become no longer visible. The only thing left is the core of the star. Consider the Chandrasekhar Limit:

Chandrasekhar Limit: 1.4 \;M_\odot.

A star with core mass smaller than the Chandrasekhar Limit will not overcome electron degeneracy and end up as a white dwarf. Most of the outer layer of the star in question here will be blown away already. The core mass of this star will be only a fraction of its 0.5 \;M_\odot, which is much smaller than the Chandrasekhar Limit.

As the star completes the triple alpha process, its core continues to get smaller. Eventually, atoms will get so close that electrons from two nearby atoms will almost run into each other. By Pauli Exclusion Principle, that's not going to happen. Electron degeneracy will exert a strong outward force on the core. It would balance the inward gravitational pull and prevent the star from collapsing any further. The star will not go any smaller. Still, it will gain in temperature and glow on the blue end of the spectrum. It will end up as a white dwarf.

7 0
2 years ago
Which of the following reactions represents a redox reaction?
malfutka [58]

Answer:

B

Explanation:

sliver is being reduced (Ag+ + e‐ ----> Ag) while,

magnesium is being oxidized (Mg -----> Mg2+ + 2e‐)

4 0
1 year ago
Name the four states of matter, and a characteristic to describe each.
Trava [24]

Answer:

solid particles are tightly held.

liquid particles have perfectly inelastic collisions

gas move in constant random motion

vapour

7 0
2 years ago
g If the titration of a 10.0-mL sample of sulfuric acid requires 28.15 mL of 0.100 M sodium hydroxide, what is the molarity of t
Leona [35]

Answer:

M_{acid}=0.141M

Explanation:

Hello,

In this case, the reaction between sulfuric acid and hydroxide is:

H_2SO_4+2NaOH\rightarrow Na_2SO_4+2H_2O

We can notice a 1:2 molar ratio between the acid and the base respectively, therefore, at the equivalence point we have:

2*n_{acid}=n_{base}

And in terms of volumes and concentrations:

2*M_{acid}V_{acid}=M_{base}V_{base}

So we compute the molarity of sulfuric acid as shown below:

M_{acid}=\frac{M_{base}V_{base}}{2*V_{acid}} =\frac{0.100M*28.15mL}{2*10.0mL}\\ \\M_{acid}=0.141M

Best regards.

6 0
2 years ago
clacium hydroxide is slightly soluable in water about 1 gram will dissolve in 1 liter what are the spectator ions in the reactio
Semmy [17]

Answer:

Ca²⁺ and Cl⁻

Explanation:

In a chemical reaction, spectator ions are ions that <em>are not involved in the reaction</em>, that means are the same before and after the reaction.

In water, calcium hydroxide, Ca(OH)₂ is dissociated in Ca²⁺ and OH⁻. Also, hydrochloric acid, HCl, dissociates in H⁺ and Cl⁻. The reaction is:

Ca²⁺ + 2OH⁻ + 2H⁺ + 2Cl⁻ → 2H₂O + Ca²⁺ + 2Cl⁻

<em>The ions that react are H⁺ and OH⁻ (Acid and base producing water)</em>

<em />

And the ions that are not reacting, <em>spectator ions</em>, are:

<h3>Ca²⁺ and Cl⁻</h3>
7 0
3 years ago
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