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Chemistry Questions and Answers (Q&A)

Because there is an axis of symmetry, the molecule is considered to be achairalbecause of the presence of such axis

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Dalton was given credit for the atomic theory. im correct. :)

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Buffers are important in living things because they regulate the pH of various areas in the organism, allowing for optimal pH for favourable biological reactions (and sometimes non-optimal pH to prevent reactions that are unfavourable), optimal pH for the enzymes that catalyze these reactions, and preventing the denaturing of various proteins through extreme shifts in pH.

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The mass of KClO3 must be decomposed in order to generate 5.00 L of oxygen, measured at STP is 18.2 g KClO3. This is a prime example of Stoichiometry. Stoichiometry is founded on the law of conservation of mass where the total mass of the reactants equals the total mass of the products, leading to the insight that the relations among quantities of reactants and products typically form a ratio of positive integers. KClO3 is chemical formula for potassium chlorate. Potassium chlorate is a white crystalline solid, and forms a very flammable mixture with it is combined with combustible materials.

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CaF2. Calcium fluoride is the inorganic compound of the elements calcium and fluorine. It is a white, insoluble solid. It occurs as the mineral fluorite, which is often deeply colored, owing it to impurities. A single calcium atom bonds with a single oxygen atom to make this compound.

It is most commonly used in detergents. Calcium fluoride is the principal source of fluorine, and its compounds. Pure calcium fluoride is used as a catalyst in dehydration and dehydrogenation. It is used to fluoridate drinking water. It is an odorless gray powder or granules.

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The correct answer to this question is C, sodium peroxide. Sodium peroxide is an inorganic compound. To name a binary ionic compound, you must follow the naming conventions based on the chemical formula--Na(2) is the sodium, and the O(2) is the peroxide. In this chemical formula, peroxide is the polyatomic ion in this chemical forumla. Na represents the element sodium.

Sodium Peroxide is yellowish solid, and it is the product of sodium ignited in excess oxygen. Other names for sodium peroxide include: Disodium dioxide, Flocool, Solozone, and Disodium peroxide. Thus, based on my explanation, the answer to this question is sodium peroxide.

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The correct answer to this question is B, lead(IV) oxide. First, you must determine the type of compound you are working with. Then you must apply the naming convention rules to name the type of compound. This is an an ionic (Metal and Non-Metal) compound. You name the non-metal (Oxygen), then replace the -ygen with -ide.

Then, you can look at the chemical formula to find the charge for Pb. O has an ionic charge of -2, and thus there are two O atoms the total negative charge is -4. Then, the lead must have a +4 for the compound to be balanced. That's why there is a (IV) after the name for Pb.

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The correct answer to this question is C. The constant bombardment of gas molecules against the inside walls of a container produces pressure on the walls; gas pressure results from the collision of these particles on the walls at different velocities. This is known as the kinetic theory of gases. A gas is composed of a large number of submicroscopic particles (atoms or molecules) that are in constant and random motion through the air.

As these molecules bounce around within the container, the energy is contained inside, and the pressure builds. The macroscopic properties of gases include volume, thermal conductivity, temperature, viscosity, and pressure.

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Phosphates enter the water from human and animal waste, laundry, cleaning, industrial, and fertilizer waste. The exaggerated phosphate supply is detrimental because it over-fertilizes the plant life and causes their life cycle to shorten. They die off and overcrowd the body of water and force it to become shallow and perish much faster than new bodies can be created.

This process is called eutrophication but at high speed. The rapidly growing plants tend to choke the waterway and decrease the oxygen supply. So, the answer would be 2 and 3.

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It can be exothermic because exothermic means giving out heat it is giving out heat and then melting

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