CHEMISTRY HIGH SCHOOL

What is a star's emission spectrum?It is the same as the HR diagram and gives the same information.
It is the fingerprint of all of the colors of light emitted by a star.
It is a graph of all the pollution given off by a star.
It is a graph of the star’s solar flares.

Answers

Answer 1
Answer: The right answer for the question that is being asked and shown above is that: "It is the same as the HR diagram and gives the same information." a star's emission spectrum is tat It is the same as the HR diagram and gives the same information.

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In solids, the particles of matter are not in constant motion.True or False?First to answer and get it correct will get the ''Brainliest Answer''
Which elements are included in Group 5A?
seawater contains % (by mass) of potassium. how many grams of potassium are there in 2.86 l of seawater? the density of seawater is 1.025 .

What will happen to the volume if the amount of a gas is decreased at constant temperature and pressure?

Answers

To predict the changes, we first that this gas is ideal. An ideal gas i when the molecules of the gas occupy a negligible volume and have no interactions with one another. The conditions of this gas can be calculated by the use of the Ideal Gas equation which is expressed as: PV=nRT. If this gas is at a constant temperature and pressure and the amount is decreased then the volume will most likely decrease as well.

Which half-reaction can occur at the anode in avoltaic cell?
(1) Ni2+ + 2e---> Ni (3) Zn--> Zn2+ + 2e-
(2) Sn + 2e---> Sn2+ (4) Fe3+--> Fe2+ + e-

Answers

The answer is (3). The reaction that can occur at the anode is oxidation reaction which will lose electrons. So (1) and (2) are not correct. For (4) Fe3+ can not lose electrons again.

The thirdreaction of the zinc-releasing electron and zinc ion will occur as the half-reaction at the anode of the voltaic cell. Thus, option 3 is the correct option.

What is a half-reaction?

A half-reaction is a depiction of the oxidation or the reduction half of a redox reaction that involves the stating of the oxidation states and the release or the absorption of the electrons.

The anode is an electrode of the voltaic cell where the oxidation reaction takes place. The oxidation results in the loss of the electrons and hence, reactions 1 and 2 cannot occur at the anode. The fourth reaction is also not possible as iron cannot lose its electron.

Therefore, option 3. Zn → Zn²⁺ + 2e⁻ will occur at the anode.

Learn more about anode and oxidation here:

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Oil flows upward in the wick of a lantern because of the liquid property calledA. density.
B. meniscusity.
C. viscosity.
D. capillarity.

Answers

B
Meniscusity the convex or concave upper surface of a column liquid, the curvature of which is caused by surface tension
Capillarity. Capillary action is what causes anything with a wick to work, think about when you stick the corner of a paper towel in water, the water soaks up the paper towel.

Which compound has the highest precent composition by mass of strontium? A) SrCl2
B) SrI2
C) SrO
D) SrS

Answers

First find the molar masses of all of the compounds:
SrCl2 = 158.53g/mol
SrI2 = 341.43g/mol
SrO = 103.62g/mol
SrS = 119.68g/mo

Then find the molar mass of Sr in each of the compounds. Since there is only one Sr in every compound, the mass will be the same: 87.62g/mol Sr

Now divide the molar mass of Sr by each of compounds' masses:
SrCl2 = (87.62)/(158.53) = 0.553
SrI2 = (87.62)/(341.43) = 0.257
SrO = (87.62)/(103.62) = 0.846
SrS = (87.62)/(119.68) = 0.732

Now multiply each of the results by 100 to get the percent composition of Sr by mass:
(0.553)(100) = 55.3% Sr in SrCl2
(0.257)(100) = 25.7% Sr in SrI2
(0.846)(100) = 84.6% Sr in SrO
(0.732)(100) = 73.2% Sr in SrS

Thus SrO has the highest percent composition by mass of Sr

How many electron cloud energy levels are present in aluminum?

Answers

i think the answer is three

A measurement of the amount of solute that is dissolved in a given quantity of solvent; usually expressed as mol/L.

Answers

Answer:Concentration is a measurement of the amount of solute that is dissolved in a given quantity of solvent; usually expressed as mol/L.

Explanation:
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