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kupik [55]
3 years ago
10

10. Bands of rock on the seafloor showing alternating magnetic orientation indicate Earth's magnetic field has ____.

Chemistry
1 answer:
Minchanka [31]3 years ago
7 0

Answer:

The answer is Reverse Itself In The Past

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When a drawing made with a black marker gets wet, the marker bleeds and more separates into several colors. What method of separ
aleksandr82 [10.1K]

Answer : (4) Chromatography

Explanation :

Chromatography : It is a separation technique of a mixture by passing it through a medium in which components travels at different rates.

There are many types of chromatography but this is paper chromatography.

Paper chromatography : It is used to separate the colored substances. In paper chromatography, water is the mobile phase and paper is the stationary phase. The mixture of components moves at different speeds through the stationary phase so that they can be separated.

In paper chromatography, several colors can be separated based on their solubility. The more soluble a color is, the more readily it will dissolve in mobile phase and farther it will travel.


5 0
3 years ago
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The__ model assigns to fixed orbits of defined energy. To move between orbits, electrons must emit or absorb _____ radiation
AURORKA [14]

Answer:

The Bohr model assigns to fixed orbits of defined energy. To move between orbits, electrons must emit or absorb electromagnetic radiation

Explanation:

In the Bohr model of the atom, the atom itself looks like a solar system.

In fact, at the center of the atom we have the nucleus, which contains protons and neutrons.

Around the nucleus, at a much higher distance, we have the electrons, negatively charged. The electrons move around the nucleus in fixed orbits, like the planets around the Sun.

According to Bohr's model, the electrons  cannot live in the space between two orbits, but they must stay in one of these orbits. Each of these orbits is associated to a certain energy level: therefore, this means that the energies of the electrons in an atom are quantized, so they cannot take all possible values, but only some precise values.

Moreover, according to the law of conservation of energy:

- When an electron jumps from a lower energy level to a higher energy level, it must absorbs energy, and this energy is absorbed in the form of electromagnetic radiation (a photon) whose energy is equal to the difference in energy between the two levels

- SImilarly, when an electron jumps from a higher energy level to a lower energy level, it releases energy, in the  form of electromagnetic radiation (a photon) whose energy is equal to the difference in energy between the two levels.

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3 years ago
1) The term which indicates that the element occurs in pairs is ____. Select the letter of the correct answer.
Reika [66]
1. Diatomic
2. Products
3. Reactants
4. Coefficient
5. Subscript
6. True
7. False
8. First you must write the reactants. Ensure the valencies of the reactants are correct. Draw an arrow. Write the products. Ensure the valencies of the products are correct and apply subscripts as necessary. Balance the equation by ensuring both sides have equal amounts of each elements - use only coefficients to complete this NOT subscripts. 
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3 years ago
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Help me with this question please
CaHeK987 [17]
D. there is one atom of sulfur and three atoms of oxygen
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3 years ago
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Which two chemical elements make up earths atmosphere
Lera25 [3.4K]

Earth's atmosphere is 78% nitrogen, 21% oxygen, 0.9% argon, and 0.03% carbon dioxide with very small percentages of other elements. Our atmosphere also contains water vapor.

hope this helps!

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7 0
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