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Chemistry Questions and Answers (Q&A)

The answer is B.) Glass B. Though all glasses have the same depth, Glass B holds the most water. This is in accordance to Archimedes Principle where Pressure is equal to the product of depth, the density of the object, and acceleration due to gravity. All three glasses have the same depth and acceleration due to gravity but they have different density. In getting the density, it is mass divided by volume.

So Glass B holding the most water, it has the greatest liquid pressure at the bottom. Imagine three human inverted pyramids where one group has more people to balance. It will give that person too much pressure to carry and balance those people on his shoulders just like Glass B in this situation.

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Cholecystokinin is in the body that helps with digestion. However, it does not break down everything. It helps to break down and digest fat and other proteins. The way that it works is by contracting the gallbladder. Cholecystokinin is known as CCK. It is an intestinal hormone responsible for gallbladder contraction. You would most likely see CCK in fatty acids in the body or in the amino acids.

The function of this important part of the body is involved in gastrointestinal areas, digestion, satiety, neurological, anxiogenic, panicogenic, and hallucinogenic. Sometimes, CCK can be a problem like for those with Parkinson’s Disease. Since people with Parkinson’s sometimes see things that are not there, it is believes that CCK sometimes causes those visions.

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The inside of the object changing from element to compound

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A pure substance is an element or compound that has a constant chemical composition and property. It cannot be separated into components by physical separation, without breaking down chemical bonds. Substances which are commonly found in pure form include water, diamond, gold, table salt, brass, bronze and saline solution. It is free of contaminants, has a constant composition and resilient properties throughout the sample.

A pure substance produces chemical reaction to form expected products. It refers to an element or component that has no component to another compound or element. Pure substances have a specific boiling point and a particular melting point. The degree of purity of a substance is just the measure of the extent at which pure substances are present in an element.

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The correct answer to this question is C, 0.00516 mol. To solve this equation, the ideal gas law equation can be used. The equation is P V = n R T. P stands for the pressure of the gas. V is for the volume the gas occupies. n is the number of moles present, R is the univeral gas constant, which is 0.0821 atm L mol K .Lastly, T is the absolute temperature of the gas.

Plugging in the amounts given in the question gives us our answer. The ideal gas law used to solve this question was first introduced in 1834 by physicst Emile Clapeyron. He cited the law as a combination of the Boyles and Charles laws.

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The correct answer to this question is D, the number of electrons. Sulfur possesses 6 electrons and is therefore considered neutral. Ions possess 8 electrons, and thus has 2- minus charge. An electron is defined as the stable subatomic particle with a charge of negative electricity.

Electrons are found in all atoms and they act as the primary carrier of electricity in solids. An ion is defined as an atom or molecule with a net electric charge due to the loss or gain of one or more electrons. An ionis made by removing electrons from a neutral atom to give a positive ion or adding electrons to a neutral atom to give a negative ion.

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The correct answer to this question is A; the oxidation number of Hydrogen in KH is -1. A few general rules apply when assigning oxidation numbers: a few of these include the oxidation number of an atom in an element is zero, and the algebraic sum of the oxidation numbers in the formula of a compound is zero.

Generally, Hydrogen in compounds has an oxidation number of +1, although in metal hydrides such as NaH, LiH, and KH, its number is -1. Additionally, the only oxidation number for potassium (symbol K) in a simple inorganic compound is +1; therefore the oxidation number of hydrogen in KH is -1.

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The answer to this is work which means that D is the answer to this question. You will know that there is work because there is a displacement that has occurred. Usually, when there is a movement towards a certain direction because of something that an object has done, this would be related to work. Just remember that there should be an external force that will cause an object to move.

For example, when a person pushes a box going east, and the box moves towards the east, this is a sign that work has occurred. Force refers to the effort that is placed on the box so that it will move. Time refers to the period of rest and the period that the box has moved. Energy may come in two forms potential or kinetic.

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B. Strickland

Ask me anything!

The NH3 is the chemical formula for a compound of Nitrogen and Hydrogen called ‘‘Ammonia’’. Ammonia is a colorless gas with a characteristic pungent smell. It has a molar mass of 17.031 g/mol. The Haber process is the major way through which Ammonia is produced. Ammonia evaporates quickly at room temperature. It is interesting to know that it is slightly lighter than air and is not ordinarily flammable but in extremely high concentrations can create an explosive mixture with air.


It is a universal nitrogenous waste, particularly among aquatic organisms and it contributes positively to the nutritional needs of terrestrial plants by serving as a precursor to food and fertilizers. Ammonia dissolves easily in water to form ammonium hydroxide solution which can cause irritation and burns. Ammonia gas is easily compressed and forms a clear, colorless liquid under pressure. Ammonia, NH3, is one of the most commonly produced industrial chemicals in the United States.

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T. Lopez

Let's see how far my knowledge stretches

Nostoc and Anabaena are two different types of colonies that may sometimes be interchanged because of their similar features. One of the most noticeable differences that you will see is their shape. The Nostoc colony will have a way that is uniquely it's own. You will know immediately that it is Nostoc while the Anabaena is usually shapeless. If you are wondering where these two can be found, they are typically found in certain soils, in the bottom of lakes, some moist rocks, and so much more.


They are both unique because they have the power to perform photosynthesis, which used to be considered to be only done by plants. They have some pigments that they can apply for the process of photosynthesis.

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