Use water as an example to contrast the properties of a compound with the elements from which it is composed

1 answer:

4 0

Properties of a compound is completely different from their elements.

Water is composed by hydrogen and oxygen.

For example, the boiling point of oxygen is - 183 °C and hydrogen is - 253 °C, meanwhile, water has a boiling point of 100°C

Another example is when you put a burning wooden splint into oxygen, it burns more brightly. Put it in hydrogen, you may hear a "pop" sound, or even explode when large amount of hydrogen. But if u put a burning splint in water, it goes off.

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When calcium hydroxide powder is placed into a hydrochloric acid solution, aqueous calcium chloride and water are formed?

Vanyuwa [196]

Answer: yes, when calcium hydroxide powder is placed into a hydrochloric acid solution, aqueous calcium hydroxide and water are formed.


Explanation:

1) Calcium hydroxide is a base whose chemical formula is: Ca(OH)₂

2) Hydrochloric acid is the acid with chemical formula HCl

3) Acids and bases react in a double replacement reaction forming salt plus water: Acid + Base → salt + water


4) The specific chemical equation for these reactants is:

Ca(OH)₂ (s) + 2HCl(aq) → CaCl₂ (aq) + 2H₂O(l)

5) CaCl₂ is calcium chloride, a salt, and H₂O is water

5 0

3 years ago

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Julia did an experiment to study the solubility of two substances. She poured 100 mL of water at 20 °C into each of two beakers

Aleks [24]

Answer: The solubility of B is high than the solubility of A.

Explanation:

The solubility is defined as the amount of substance dissolved in a given amount of solvent. More the solute gets dissolved, high will be the solubility and less the solute dissolved, low will be the solubility.

For the given observations:

Mass of undissolved substance of substance A is more than Substance B at every temperature. This implies that less amount of solute gets dissolved in the given amount of solvent.

Hence, substance B has high solubility than substance A.

7 0

3 years ago

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Identify the type or types of intermolecular forces present between molecules of the compound pictured below:

Dennis_Churaev [7]

Answer:

dispersion, dipole-dipole, and hydrogen bonding

Explanation:

The pictured compound is an amine. Amines have high boiling points. Amines have such high boiling points because they posses about three different kinds of intermolecular interactions, viz; hydrogen bonds, dispersion forces and dipole-dipole interactions.

The dipole interactions and hydrogen bonds arise from the fact that the N-H bond is polar. Also recall that a hydrogen bond is formed when hydrogen is bonded to an electronegative element. Hydrogen bonds lead to significant intermolecular association and high boiling points.

Hence the three kinds of intermolecular forces present in the pictured compound are; hydrogen bonding, dipole interactions and dispersion forces.