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3 years ago

There are long, underwater mountain chains that divide the sea

Chemistry

1 answer:

natima [27]3 years ago

4 0

Mid-Ocean Ridges

Two examples of Mid-Ocean Ridges are the Mid-Atlantic Ridge and the East Pacific Rise.

Explanation:

Mid-ocean ridges are mountain-like geographical features on the ocean floor. They usually line along the divergent boundaries of tectonic plates moving away from each other. This is because as the plates move in opposite direction, the vacuum in between the plates is filled by upwelling magma from the mantle. Usually the texture of the rocks that form these mountain ridges has bands. This is because, before the magma cools, the iron in the magma (due to its ferromagnetic property) aligns with the earths magnetic field. The earth magnetic flux flips over several 1000 years hence these bands orient themselves differently depending on the magnetic field orientation at the time they were formed.

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Match the scientist to his contribution to the atomic theory.

Masja [62]

Explanation:

Rutherford → Nucleus

Rutherford in his model of an atom proposed that in an atom positive charge is concentrated in the center of an atom with he named nucleus and along with that also told that whole of an atom is also concentrated in the nucleus of an atom.

Bohr → Electron energy levels

Bohr in his structure of atom explained that electrons revolve around the nucleus in fixed orbit or shell or energy levels.These energy levels are stable and are stationary along with different energy value.

Schrodinger → Electron cloud and orbitals

Schrodinger proposed the mechanic model of atom in which he defined the location of electrons inside an atom by electron cloud in 3-d space.To define their location he introduced concept of quantum number.

7 0

3 years ago

Read 2 more answers

The molal boiling point elevation constant Kb= 2.13 ℃kgmo-for a certain substance X, when 12. g of urea are dissolved in 100. g

Tomtit [17]

<u>Answer:</u> The boiling point of pure solution is 122.04°C

<u>Explanation:</u>

Elevation in boiling point is defined as the difference in the boiling point of solution and freezing point of pure solution.

The equation used to calculate elevation in boiling point follows:

$\Delta T_b=\text{Boiling point of solution}-\text{Boiling point of pure solution}$

To calculate the elevation in boiling point, we use the equation:

$\Delta T_b=iK_bm$

Or,

$text{Boiling point of solution}-\text{Boiling point of pure solution}=i\times K_b\times \frac{m_{solute}\times 1000}{M_{solute}\times W_{solvent}\text{ in grams}}$

where,

Boiling point of solution = 126.3°C

i = Vant hoff factor = 1 (For non-electrolytes)

$K_b$ = molal boiling point elevation constant = 2.13°C/m

$m_{solute}$ = Given mass of solute (urea) = 12. g

$M_{solute}$ = Molar mass of solute (urea) = 60 g/mol

$W_{solvent}$ = Mass of solvent (X) = 100. g

Putting values in above equation, we get:

$126.3^oC-\text{Boiling point of pure solution}=1\times 2.13^oC/m\times \frac{12.\times 1000}{60g/mol\times 100.}\\\\\text{Boiling point of pure solution}=122.04^oC$

Hence, the boiling point of pure solution is 122.04°C

5 0

4 years ago

Scientists use supporting evidence to create an explanation. Explain why using evidence to support your explanations is a good p

antoniya [11.8K]

Using evidence to support explanations is a good practice because it proves that what you are explaining can be verified.

8 0

3 years ago

What happens to the temperature and density of the material between points B and C?

makvit [3.9K]

Answer:

Temperature decreases and density increases

Explanation:

Let us remember that density of a material increases as the temperature of the material decreases. So the cooler a material becomes, the denser it becomes also.

Between points B and C, the material rapidly cools down and the temperature decreases accordingly. This ultimately results in an increase in density since cooler materials are denser than hot materials.

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3 years ago

Which of the following summarizes photosynthesis?

Dmitry [639]

Carbon dioxide + water → glucose + oxygen + water

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4 years ago