CHEMISTRY HIGH SCHOOL

Which statement explains why water is classifiedas a compound?
(1) Water can be broken down by chemical means.
(2) Water is a liquid at room temperature.
(3) Water has a heat of fusion of 334 J/g.
(4) Water is a poor conductor of electricity.

Answers

Answer 1
Answer:

Answer: Option (1) is the correct answer.

Explanation:

Compounds are the substances which contain two or more different elements.

Similarly, water is a compound as it is made up when two hydrogen atoms combine with one oxygen atom. Compounds can be broken down with the help of chemical reactions.

Hence, the statement water can be broken down by chemical means explains why water is classified  as a compound.
Answer 2
Answer: I believe the correct answer from the choices listed above is option 1. Water is classified as a compound because it can be broken down by chemical means. This process is called electrolysis where the products are H2 and O2. Hope this answers the question. Have a nice day.

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The shape of a molecule is tetrahedral. How many lone pairs are most likely on the central atom?zero
two
three
four

Answers

Answer: Zero lone pairs on the central atom.

Explanation:

  • Lone pairs and bond pairs together decides the geometry of the molecule.
  • Bond pairs  together decides the shape of the molecule.

The molecule is with with tetrahedral shape which means that molecule has a tetrahedral geometry.

The value of number of electrons around the central atom with tetrahedral geometry according to VESPR theory is '4'. Which means that electrons around the central atom are 4.

Since, the molecule is in tetrahedral shape which means four bonds are pointing in direction towards the four vertices of tetrahedral which means their are zero lone pair present on the central atom.
The number of lone pairs that are most likely found on the central atom is zero. There are no lone pairs found on the central atom.

Is it possible for an object not to be in motion and still have force acting upon it?

Answers

yes,this is an example:
An apple is sitting on a desk he is not in motion but one of the forces acting upon it is gravitational pull because is not floating around, the earth gravitational pull is pulling it down to the earth's surface.

Before free oxygen gas became abundant in the oceans and atmosphere, it reacted with a metal and produced what type of formations?a. the ionosphere
b. the ozone layer
c. banded iron formations
d. stromatolites

Answers

Before free oxygen gas became abundant in the oceans and atmosphere, it reacted with a metal and produced banded iron formations. 

Answer;

Banded iron formations

Before free oxygen gas became abundant in the oceans and atmosphere, it reacted with a metal and produced banded iron formations.

Explanation;

  • Cyanobacteria are thought to have introduced oxygen into the early atmosphere. This was important because oxygen played a key role in the evolution of eukaryotic organisms creating an ozone layer to shield life from UV rays.
  • Banded iron layers were formed in sea water as the result of oxygen released by the photosynthetic cyanobacteria.  As the photosynthetic organisms released oxygen, the available iron in the Earth's oceans precipitated out as iron oxides.

Which factor most influenced the economicdevelopment of the colonial South?
(1) plentiful forests
(2) warm and wet growing seasons
(3) rich deposits of iron ore and coal
(4) abundant water power for manufacturing

Answers

It was by far "warm and wet growing seasons" that was the most important factor in terms of the South's economic development. Cotton and tobacco were the biggest exports.

Explanation:

These crops created tons of cash, had massive markets round the world, however required a stable and enormous hands to grow and harvest them.The yank South is understood for its long, hot summers, and wealthy soils in stream valleys creating it a perfect location for growing cotton. the various southern seaports and riverside docks allowed shipping cotton to remote destinations. By 1860, Southern plantations equipped seventy fifth of the world's cotton, with shipments from Houston, city, Charleston, Mobile, Savannah, and some different ports. The unquenchable European demand for cotton was a results of the commercial Revolution that created the machinery and factories to method raw cotton into vesture that was higher and cheaper than hand-made product.
It was by far "warm and wet growing seasons" that was the most important factor in terms of the South's economic development. Cotton and tobacco were the biggest exports.

Gas-to-liquid synfuel production can produce diesel, naptha and paraffin. The formation of these products usually involves _____. the Fischer-Tropsch Process the removal of carbon atoms from the fuel adding highly acidic substances such as hydrochloric acid the production of radioactive waste that must be stored in protective barrels

Answers

The best and most correct answer among the choices provided by the question is the second choice. The formation of gas-to-liquid synfuel usually involves the removal of carbon atoms from the fuel adding highly acidic substances such as hydrochloric acid. I hope my answer has come to your help. God bless and have a nice day ahead!

The formation of these products usually involves THE FISCHER-TROPSCH PROCESS.

The Fischer-Tropsch process refers to a series of chemical reactions which convert hydrogen and carbon monoxide into liquid hydrocarbons in the presence of metal catalysts. The temperature utilized in the process is normally between 150 and 300 degree Celsius. The techniques was developed by Franz Fischer and Hans Tropsch in 1925. The technique is usually used to turn coal into liquid and to turn gases to liquid fuels.

Four acids are analyzed and their Ka values are determined. Which of the following values represents the strongest acid?

Answers

Given four acids with different Ka's, the strongest acid will be the one with the greatest Ka. This can be verified by taking the -log(Ka). Larger Ka will result to less pH which means it becomes more acidic. Less Ka means it is relatively basic compared to others.
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