The temperature at which a liquid becomes a solid is the:A. Boiling point
B. Density
C. Freezing point
D. Solubility

Answers

Answer 1

Answer: The point where a liquid becomes a solid is its freezing point. The freezing point of water, for example, is 0°C, at which point it turns to ice.

Answer 2

Answer: The answer is Freezing point Because It would be 0 degrees Celsius is it freezing point.

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12. A salt used as a fertiliser has the empirical formula H4N2O3.Suggest the formulae of the ions present in this salt

Answers

Final answer:

The formula H4N2O3 represents a salt containing ammonium (NH4+) and nitrate (NO3-) ions. These ions are often present in fertilisers because they effectively deliver nitrogen to plants.

Explanation:

The empirical formula H4N2O3 represents a salt used in fertilisers and it contains hydrogen, nitrogen, and oxygen. In this salt, the ions present are the ammonium ion (NH4+) and the nitrate ion (NO3-). Hydronium and nitrogen dioxide might also be present in the compound. However, the most relevant ions are generally the ammonium and the nitrate ions, because they are often used in fertilizers due to their abilities to effectively deliver nitrogen to plants.

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The empirical formula H4N2O3 suggests that in this salt, there are two nitrogen (N) atoms, three oxygen (O) atoms, and four hydrogen (H) atoms. To determine the formulae of the ions present, we can consider that hydrogen usually forms H+ ions, while nitrogen can form N3- ions, and oxygen can form O2- ions.

Based on this, the formulae of the ions present in this salt could be:

- Cation: H+
- Anions: N3- and O2-

So, the salt might consist of H+ cations and a combination of N3- and O2- anions, depending on the specific compound.

What is the IUPAC name for the compound FeS?(1) iron(II) sulfate (3) iron(II) sulfide
(2) iron(III) sulfate (4) iron(III) sulfide

Answers

The correct answer is option 3. The IUPAC name is Iron(II) sulfide. It is the less stable amorphous form. When this is powdered, it is pyrophoric or it ignites spontaneously in air. It readily reacts with hydrochloric acid producing hydrogen sulfide.

The IUPAC name for the compound FeS is "iron(II) sulfide." Therefore, option 3 is correct.

The IUPAC (International Union of Pure and Applied Chemistry) name is a systematic way of naming chemical compounds.

The compound FeS consists of iron (Fe) and sulfur (S) atoms. In FeS, iron has a +2 oxidation state, and sulfur has a -2 oxidation state.

According to the IUPAC nomenclature rules for naming inorganic compounds, the cation (iron) is named first, followed by the anion (sulfide).

To indicate the oxidation state of iron, the Roman numeral II is used in parentheses after the name "iron." The resulting name is "iron(II) sulfide."

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The nucleus of 8Be, which consists of four protons and four neutrons, is very unstable and spontaneously breaks into two alpha particles (helium nuclei, each consisting of two protons and two neutrons). True or false?

Answers

Answer: The given statement is false.

Explanation:

When there is more difference in the ratio or number of protons and neutrons then nucleus of the atom becomes unstable in nature. This unstability is caused due to greater repulsion between the like charges of sub-atomic particles.

As a result, this force of repulsion becomes greater than the binding energy. And, this force is known as the weak force because it is unable to bind the neutrons and protons together.

The proton and neutron ratio for smaller elements is 1:1 and for higher elements it has to be 1:5. Since, $^(8)Be$ is a smaller element with 4 protons and 4 neutrons. Hence, the proton and neutron ratio is 1:1.

Therefore, $^(8)Be$ is stable in nature.

Thus, we can conclude that the statement nucleus of 8Be, which consists of four protons and four neutrons, is very unstable and spontaneously breaks into two alpha particles (helium nuclei, each consisting of two protons and two neutrons), is false.

Identify the following as a compound or a mixture: quartz (SiO2)

Answers

quartz (SiO2) is a compound. A compud is the combination of two or more elements. It is a compound because three elements are formed, the silicon and the two atoms of oxygen.

Amorphous solids do not possess overall order, with individual clusters held together only by Van der Waals forces.TRUE

FALSE

Answers

The answer is true. Amorphous solids, also known as non-crystalline solid, lacks a long-range order seen in a crystalline solid. Examples are glass. polymers and silicon. Many solids around are in an amorphous form.

Answer:

True

Explanation:

Amorphous solid is the designation given to a structure that has no long-range (atomic) spatial ordering, such as regular solids. For a material to be considered as regular solid it must have a defined crystalline structure, which corresponds to a positioning of the atoms that compose it. Amorphous materials have no definite geometric shape, may even have some rigidity like ordinary solids, but their atoms are not in spatial organization (at the microscopic level), in which case amorphous solids have no general order, with individual clusters joined together only. by the forces of Van der Waals.

Ions can have a positive or negative charge. false or true