What is a water molecule composed of?

Answer:

A) The pH will increase.
B)The pH will change because the solution is being neutralized via a basic solution being added to an acid.

The enthalpy of formation of the compound is -230.3 kJ/mol.

We know that the heat of formation of a substance can be obtained from the equation; [tex]C_{8} H_{18} (g)+\frac{25}{2} O_{2} (g)-------- > 8CO_{2}(g)+9 H_{2}O[/tex](g)ΔH∘rxn=−5093.7 kJ/mol by the use of the Hess law.

Let us now obtain the heats of formation of each of the species in the reaction as we can see them from the species in the reaction equation;

[tex]CO_{2}[/tex](g) = -393.5 kJ/mol

[tex]H_{2} O[/tex](g) = -241.82 kJ/mol

[tex]O_{2}[/tex](g) = 0 kJ/mol

The enthalpy of formation of the compound is now;

8(-393.5) + 9( -241.82) + 5093.7

= -3148 -2176 + 5093.7

= -230.3 kJ/mol

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Dishwashing liquid (detergent) is useful for removing grease from pans due to its amphipathic character.

Grease is a type of liquid lubricant that has thickening agents dispersed throughout it. It can also be solid or semisolid. A soap is typically emulsified with mineral or vegetable oil to form grease.

One typical characteristic of greases is that they have a high initial viscosity, which, when sheared, decreases to create the impression of an oil-lubricated bearing with a viscosity that is roughly equal to the base oil used in the grease. Shear thinning refers to this change in viscosity. Sometimes the term "grease" is used to refer to lubricating substances that are merely soft solids or highly viscous liquids; however, these substances lack the shear-thinning characteristics of traditional grease. For instance, petroleum jellies like Vaseline aren't typically categorized as greases.

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Answer:

Explanation:

Think about the example of a mixture of salt water. The salt is a non-volatile ionic compound - this means it is very difficult to turn salt into a gas. It takes very high temps just to melt the salt.

The water is a volatile molecular compound which can be heated to the boiling point fairly easily. This leads to vaporization which turns the liquid water into steam.

So heating a solution of salt water allows you to separate the water from the salt.

Evidence of a chemical change will be Burning.

Changes are either classified as physical or chemical changes. Chemists learn a lot about the nature of matter by studying the changes that matter can undergo.

A change can be physical if no ties are made or broken. They entail rearranging molecules but do not alter them.

A few examples of physical changes are:. shifts in state (changes from a solid to a liquid or a gas and vice versa).

When bonds between molecules or atoms are created, disrupted, or both, chemical changes result. This implies that a substance with a particular set of properties—such as melting point, color, flavor, etc.—becomes a substance with a different set of characteristics.

The burning of paper and cloth involves both a physical and a chemical change, which can be reversed more easily than the boiling or heating of water. If water is boiled for more time it changes from a chemical state to a vapor state, which is a physical change.

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