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3 years ago

Which sentence correctly explains the process and conditions needed for hail to form? (2 points)

Chemistry

1 answer:

finlep [7]3 years ago

8 0

Answer: A form of precipitation requires melting and refreezing as they fall towards the ground.

Explanation: The hail begins as rain and freezes as it falls down to the surface.

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Describe how species on the Galapagos islands have changed over time

GarryVolchara [31]

Five to ten million years ago, the tops of underwater Galapagos volcanoes appeared above water for the first time about 600 km from mainland Ecuador in the middle of the Pacific Ocean. Those volcanic peaks were completely devoid of plant and animal life. All plants and animals that are now native to the islands must have arrived to the islands originally through some form of long-distance dispersal.There are two main ways for species to make their way to remote islands. The first method is by air in the form of flying or being blown by wind, and the second method is by sea while swimming or floating, sometimes with the aid of rafts of tangled vegetation.

6 0

3 years ago

The four major attractive forces between particles are ionic bonds, dipole-dipole attractions, hydrogen bonds, and dispersion fo

natima [27]

Answer with Explanation:

Ionic bond:It is that type of bond which formed between negative and positive ions.

Hydrogen bonding:Hydrogen bonding formed between hydrogen and high electronegative elements.

Dispersion force:It is weakest intermolecular force.It is temporary attractive force.When electrons of two adjacent atoms occupy positions that make the atoms temporary dipoles.

NaCl: In which Na is positive ion and Cl is negative ion.

Therefore, NaCl is ionic.

HF:F is highest electronegativ elements.

HF:Hydrogen bonding

HCl: Hydrogen bonding

$F_2$ :Dispersion

4 0

3 years ago

*15 POINTS*(WILL AWARD BRAINLIEST)A solid has a mass of 80 grams. A graduated cylinder contains 25 mL of water. When the solid i

Simora [160]

The answer is 2) 4.7 g/mL because the solid use 17 mL and 80g/17mL is 4,7 g/mL.

3 0

3 years ago

What can you make with molecules

bagirrra123 [75]

Answer:

H20

Explanation:

H20, is water and this is an example of a molecule. Molecules are "atoms bonded together." And hydrogen and oxygen are bonded making it a molecule.

6 0

3 years ago

CsH«N2(l) + CuCl(s)

bulgar [2K]

0.498 moles of copper(II) phthalocyanine would be produced by

the complete cyclotetramerization of 255 grams of phthalonitrile in the

presence of excess copper(ll) chloride.

<em>Copper(ll) phthalocyanine (Cu(C₃₂H₁₆N₈)) is produced by the cyclotetramerization of phthalonitrile (C₈H₄N₂) according to the following reaction: 4 C₈H₄N₂(l) + CuCl₂(s) → Cu(C₃₂H₁₆N₈)(s) + Cl₂(g) How many moles of copper(II) phthalocyanine would be produced by the complete cyclotetramerization of 255 grams of phthalonitrile in the presence of excess copper(II) chloride?</em>

Let's consider the following balanced equation.

4 C₈H₄N₂(l) + CuCl₂(s) → Cu(C₃₂H₁₆N₈)(s) + Cl₂(g)

The molar mass of C₈H₄N₂ is 128.13 g/mol. The moles corresponding to 255 g of C₈H₄N₂ are:

$255 g \times \frac{1mol}{128.13 g} = 1.99 mol$

The molar ratio of C₈H₄N₂ to Cu(C₃₂H₁₆N₈) is 4:1. The moles of Cu(C₃₂H₁₆N₈) produced from 1.99 moles of C₈H₄N₂ are:

$1.99 mol C_8H_4N_2 \times \frac{1molCu(C_{32}H_{16}N_8)}{4mol C_8H_4N_2} = 0.498 mol Cu(C_{32}H_{16}N_8)$

0.498 moles of copper(II) phthalocyanine would be produced by

the complete cyclotetramerization of 255 grams of phthalonitrile in the

presence of excess copper(ll) chloride.

You can learn more about stoichiometry here: brainly.com/question/22288091

8 0

2 years ago