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 .

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The diagram below shows different layers of sedimentary rocks.Picture showing seven layers of rocks of different colors labeled A, B, C, D, E, F, and G from top to bottom; A and B are parallel horizontal layers at the top of the diagram and C, D, E, F, and G are slanted layers with C closest to the surface and G at the bottom.

Based on the diagram, which of these inferences is most likely correct?

A.Layer A is older than Layer B.
B.Layer C is older than Layer E.
C.Layer F is younger than Layer D.
D.Layer B is younger than Layer G.

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Picture showing seven layers of rocks of different colors labeled A, B, C, D, E, F, and G from top to bottom;
A and B are parallel horizontal layers at the top of the diagram;
C, D, E, F, and G are slanted layers with C closest to the surface and G at the bottom.

The inference that is most likely correct is that (C) Layer F is younger than Layer D.

What are the half equations that exist in thus reaction: 4Na + O2 --->2Na2O .

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4Na +2e- ---->2Na2
O2 +2e- ------>2O

The only way to emit IR photons is if there are empty electronic energy levels really close to the ground state (lowest energy level). True or False

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Answer:

False. The statement is not entirely accurate.

Explanation:

Infrared (IR) photons can be emitted in various ways, not solely dependent on the presence of empty electronic energy levels close to the ground state. IR photons are typically associated with changes in molecular vibrational or rotational energy levels rather than electronic energy levels.

IR spectroscopy, for example, focuses on the interaction of IR radiation with molecules. When molecules undergo vibrational or rotational transitions, they can emit or absorb IR photons. These transitions are related to changes in the kinetic and potential energy of atoms within the molecule as they vibrate or rotate.

Electronic transitions, on the other hand, are responsible for phenomena like ultraviolet (UV) or visible light absorption and emission. In these cases, electrons move between electronic energy levels, which are typically at higher energy levels than the ground state. So, the emission of IR photons is not directly tied to electronic energy levels close to the ground state.

In summary, IR photon emission is primarily associated with vibrational and rotational transitions in molecules, and it is not contingent on the presence of empty electronic energy levels close to the ground state.

what mass of sodium chloride is produced when chlorine gas reacts with 0.29 grams of sodium iodide? working on stoichiometry and need help!

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CI2 + 2Nal ---> 2NalCI + I2
Nal = 149.9 g/mol.
NaCI = 58.5 g/mol
2 mol Nal makes 2 mol NaCI
0.29 g Nal x ( 1 mol / 149.9 g) = 0.0019 mol NaCI
00.19 mol NaCI x ( 58.5 g / 1 mol ) 0.11 g NaCI ( 2 sig figs)

The most abundant gases in the atmosphere are _____. trace gases variable gases greenhouse gases primary gases

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The correct answer is greenhouse gases. It is the most abundant gases among the choices in the atmosphere. These gases are water vapor, methane, nitrous oxide, ozone and carbon dioxide. Without these gases, the temperature of Earth will be about -18 degrees Celsius.

Answer:

greenhouse gases

Explanation:

Calculate the pH of a solution that has a [OH−] of 2.6 × 10^−6 M.A. 8.4
B. 6.5
C. 7.7
D. 6.29