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zheka24 [161]
3 years ago
8

How have observations in the sky enabled humans to explore and travel?

Chemistry
1 answer:
andre [41]3 years ago
4 0

Answer:

Observations of the sky allowed explorers to mark the passage of time both in hours and through the months of the year. Early astronomers also realized that the night sky does not look the same from different places on the Earth.

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Select the electron-domain geometry for a molecule with three bonding domains and one nonbonding domain.
mamaluj [8]

Answer: C) Tetrahedral

Explanation:

The number of electron pairs is 4 that means the hybridization will be sp^3 but as there are three bonding domains and one nonbonding domain, thus electronic geometry is tetrahedral and the molecular geometry will be trigonal pyramidal.

Linear electron geometry is possible when number of electron pairs is 2 and the hybridization will be sp^2.

Trigonal planar geometry is possible when number of electron pairs is 3 and the hybridization will be sp^3.

Trigonal bipyramidal geometry is possible when number of electron pairs is 5 and the hybridization will be sp^3d.

Octahedral geometry is possible when number of electron pairs is 6 and the hybridization will be sp^3d^2.

6 0
3 years ago
How many particles are in 1.40 x 10^7 mol of aluminum (Al)?
SpyIntel [72]

Answer:

<h3>Hlo there !! </h3>

<u>One mole of any substance contains 6.022*1023 structural units (atoms, molecules, ions, etc.). This number is known as the Avogadro constant.</u>

<u>One mole of any substance contains 6.022*1023 structural units (atoms, molecules, ions, etc.). This number is known as the Avogadro constant.So 1.04*107 mol of Al contains 1.40*107 * 6.022*1023 = 8.43*1030 structural units (in case of Al – atoms).</u>

<h3><u>8.43*1030 particles Al.</u></h3>

Explanation:

<h3>Hope this helps !!</h3>
5 0
2 years ago
Iron is listed below zinc in the activity series.
ololo11 [35]

Answer:

B

Explanation:

6 0
3 years ago
How many kilojoules (KJ) in 3.58 x 10^4 Calories?
Delicious77 [7]

Answer:

The answer to your question is: letter B

Explanation:

Data

3.58 x 10⁴ cal to joules

                                  1 calories ---------------  4.184 joules

                                   3.58 x 10⁴ cal-----------    x

                                   x = (  3.58 x 10⁴ x 4.184) / 1

                                   x = 149787.2 joules

                                  x = 1.5 x 10⁵    J

8 0
3 years ago
2.Which term best describes the processes that change rocks and mountains on Earth’s surface over time?
ArbitrLikvidat [17]

Answer:

B. weathering

or erosion

4 0
3 years ago
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