Why is anthracite a better fuel than lignite?

Answer:

The answer is Temperature (Heat), Pressure and chemical activity of fluids.

Explanation:

Metamorphic rocks result from the transformation of pre-existing rocks that have undergone structural and mineralogical changes under certain physical or chemical conditions such as temperature, pressure or chemical activity of the fluids. This type of modification is known as a process called metamorphism, in which igneous rocks or sedimentary rocks, when subjected to high temperatures, pressures or active fluids, cause changes in their composition, bringing new substances to them.

Carbon is the substance can not be decomposed by a chemical change. Therefore, option B is correct.

What is chemical change ?

A chemical change is the transformation of one material into another, the formation of new materials with different properties, and the formation of one or more new substances. It occurs when one substance reacts with another to form a new substance.

Carbon and water Although carbon dioxide and carbonic acid are simpler compounds, they are still compounds. As a result, they can decompose and leave us with the basic elements' hydrogen, oxygen, and carbon. Compounds degrade due to chemical changes.

Elements are pure substances that cannot be broken down using conventional chemical methods such as heating, electrolysis, or reaction. Elements include gold, carbon, silver, and oxygen.

Thus, option B is correct.

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Answer:

A liquid boils at a temperature at which its vapor pressure is equal to the pressure of the gas above it. The lower the pressure of a gas above a liquid, the lower the temperature at which the liquid will boil

Explanation: Factors That Affect the Boiling Point

Pressure: when the external pressure is:

less than one atmosphere, the boiling point of the liquid is lower than its normal boiling point.

equal to one atmosphere, the boiling point of a liquid is called the normal boiling point.

greater than one atmosphere, the boiling point of the liquid is greater than its normal boiling point.

The following graph shows the boiling point for water as a function of the external pressure. The line on the graph shows the normal boiling point for water.

Answer:

1.75 moles of copper are needed to react with 3.50 moles of AgNO₃.

Explanation:

Given data:

Moles of copper needed = ?

Moles of AgNO₃ = 3.50 mol

Solution:

Chemical equation:

Cu + 2AgNO₃  → Cu(NO₃)₂ + 2Ag

Now we will compare the moles of copper and AgNO₃.

                      AgNO₃         :            Cu

                          2               :             1

                        3.50            :             1/2×3.50 = 1.75 mol

So 1.75 moles of copper are needed to react with 3.50 moles of AgNO₃.

Final answer:

To find the number of moles of Cu needed to react with 3.50 moles of AgNO3, we can use a proportion from the balanced equation. The number of moles of Cu needed is 1.75 moles.

Explanation:

The balanced equation shows that 1 mole of Cu reacts with 2 moles of AgNO3. Therefore, we can set up a proportion to find the number of moles of Cu needed to react with 3.50 moles of AgNO3 as follows:

Moles of Cu / 1 = 3.50 moles of AgNO3 / 2

By cross-multiplying and solving for the unknown variable, we find that the number of moles of Cu needed is 1.75 moles.

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