Which is most responsible for the uneven heating of the air in the atmosphere

Answers

Answer 1

Answer: That would be convection. This is a test. ;)

Answer 2

Answer: Convection currents

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Complete the paragraph to describe the characteristics of a silicon tetrahydride molecule (SiH4). The Lewis structure and table of electronegativities are given.

Answers

Answer: The correct answer is polar, tetrahedral and non-polar.

Explanation:

It is given a compound which is silicon tetrahydride having formula $SiH_4$

The electronegativities of silicon and hydrogen are 1.9 and 2.1 respectively.

Difference in electronegativity = 2.1 - 1.9 = 0.2

From above, some difference in the electronegativities of the atoms is there. This means that bond polarity of this molecule is polar. If the difference would have been 0, the bond polarity of the molecule is taken as non-polar.

To determine the molecular shape of the given molecule, we calculate the hybridization of this molecule. The equation used for this is:

$\text{Number of electrons}=(1)/(2)[V+N-C+A]$

where,

V = number of valence electrons present in central atom i.e. Silicon = 4

N = number of monovalent atoms bonded to central atom = 4

C = charge of cation = 0

A = charge of anion = 0

Putting values in above equation, we get:

$\text{Number of electron pairs} =(1)/(2)[4+4-0+0]=4$

As, the total number of electron pairs is 4, this means that the hybridization of this molecule will be $sp^3$ and the molecular shape will be tetrahedral.

The net dipole moment of the molecule is 0 because of the symmetry of the molecule. Thus, the molecule is considered as a non-polar molecule.

Hence, the correct answer is polar, tetrahedral and non-polar.

What is the same between mass and weight

Answers

Answer:

Mass is how much matter an object has. Weight is how much gravity an object is being acted upon.

Explanation:

The mass of an object will stay the same no matter where you place it. But if you were to place the object, in the moon for example, then the weight of the object would be less since there is less gravity on the moon.

What is the enviromental problem/issue in the ecosystem?

Answers

- Human Overgrowth
- Land Use
- Nuclear Issues
- Intensive Farming
- Pollution
- Air
-Water
- Land
- Waste

That many plants are during due to the pollution

Which compound is classified as a hydrocarbon?(1) butanal (3) 2-butanol
(2) butyne (4) 2-butanone

Answers

Answer: The correct answer is Option 2.

Explanation:

Hydrocarbons are defined as the compounds which have a covalent bond present between hydrogen and carbon atoms. For Example: $CH_4$ is a hydrocarbon. $H_2O,CO_2$ are not considered as hydrocarbons.