CHEMISTRY HIGH SCHOOL

Which reactants form the salt CaSO4(s) in a neutralization reaction?(1) H2S(g) and Ca(ClO4)2(s)
(2) H2SO3(aq) and Ca(NO3)2(aq)
(3) H2SO4(aq) and Ca(OH)2(aq)
(4) SO2(g) and CaO(s)

Answers

Answer 1
Answer:

H₂SO₄(aq) and Ca(OH)₂(aq) form the salt CaSO₄(s) in a neutralization reaction. Therefore, option C is correct.

What is a neutralization reaction?

A neutralization reaction is a chemical process in which an acid and a base combine to produce salt and water as the end products. H⁺ ions and OH⁻ ions combine to generate water during a neutralization process.

The reaction between sulfuric acid (H₂SO₄) and calcium hydroxide (Ca(OH)₂) is an acid-base neutralization reaction that produces calcium sulfate (CaSO₄) and water (H₂O) as products. The balanced chemical equation for this reaction is:

H₂SO₄(aq) + Ca(OH)₂(aq) → CaSO₄(s) + 2H₂O(l)

In this reaction, sulfuric acid donates two protons to the hydroxide ions from calcium hydroxide, forming water molecules. The remaining ions (Ca²⁺ and SO₄²⁻) combine to form the solid product, calcium sulfate. Hence, option C is correct.

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Answer 2
Answer: The answer is (3) H2SO4(aq) and Ca(OH)2(aq). The neutralization reaction will not change the valence of elements. For (4), SO2 reacts with CaO is called synthesis reaction.

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A mixture of sand and table salt can be separated by filtration because the substances in the mixture differ in( I) boiling point (2) density at STP(3) freezing point (4) solubility in water

Answers

A mixture of sand and table salt can be separated by filtration because the substances in the mixture differ in solubility in water. Thus, the correct option for this question is D.

What is meant by Solubility?

Solubility may be defined as the phenomenon in chemistry that involves the maximum amount of a substance that will significantly be disbanded in a given amount of solvent at a particular temperature.

The answer to the above question is better understood by the fact that when you mix both salt and sand in the water, you may find that salt is completely soluble in water while sand is not. This is because the bond of water is not competent enough to dissolve the sand.

Therefore, the correct option for this question is D.

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The answer is (4) solubility in water. When you put the mixture into water, the salt will dissolve and sand will not. The you can separated them by filtration will solution can pass through and sand will be left.

Which of the following chemicals, found in tobacco smoke, is also found in nail polish remover?a. ammonia
b. acetone
c. formaldehyde
d. arsenic

Answers

The answer is the option B. Acetone. Acetone is a very important solvent. Due to its solvent ability, acetone is the main constituent of nail polish removers to dissolve finger nail paint.. Acetone is also present in cigarettes as solvent for extraction process. Acetone then is found the cigarette smoke.Hope this helps. Let me know if you need additional help!

Answer:

b is the correct answer for e2020

How does the Law of Conservation of Mass relate to changes in physical state? How does it relate to chemical changes?

Answers

The Law of Conservation of Mass states that matter cannot be created nor destroyed. It can only be transformed from one state or substance to another. This means that this law applies to both physical and chemical changes. In physical changes, the substance before and after the phase change still has the same mass. In chemical changes, the mass of reactants will always have the same mass of products and by-products.

Which energy source produces carbon dioxide?a. plutonium
b. uranium
c. sunlight
d. natural gas

Answers

The answer is d. natural gas. All the other choices are alternative sources of energy, and do not produce or emit any greenhouse gas such as carbon dioxide (CO2). Natural gas, on the other hand, is an organic substance containing a significant amount of carbon, that when burned for fuel, results in the emission of CO2.

What is the mass of an atom that has 2 protons, 3 neutrons, and 2 electrons? 2 3 5 7

Answers

Mass Number = Proton + Neutron = 2 + 3 = 5

What is the difference between a crystalline material and an amorphous material? Give an example of each type.

Answers

Answer :

As we know that there are two types of solids.

(1) Amorphous Solids

(2) Crystalline Solids

Amorphous Solids : It is a type of solids in which the constituent particles of the matter are arranged in the random manner.

That means there is no proper arrangement of atoms in solid lattice but the atoms or molecules are closely spaced that means they can move freely from one place to another.

The examples of amorphous solid are, plastics, glass, rubber, metallic glass, polymers, gel, fused silica, pitch tar, thin film lubricants, wax.

Crystalline Solids : It is a type of solids where the constituent particles of the matter are arranged in the specific manner.

That means there is a proper arrangement of atoms in solid lattice. They do not have space between the molecules or atoms and they can not move freely from one place to another.

The examples of crystalline solids are, quartz, calcite, sugar, mica, diamonds, snowflakes, rock, calcium fluoride, silicon dioxide, alum.
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