Chemistry Questions and Answers (Q&A)

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,...Read More

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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...Read More

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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...Read More

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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...Read More

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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...Read More

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In a science equation, a formula is usually used to determine the mass of something. In this case, a formula is used to determine the amount of grams there are in solid barium sulfate if you combined the thirty-five milliliters of 0.160 M of barium chloride with fifty-eight milliliters of .065...Read More

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The aluminum has the greater buoyant force on it. This is because aluminum has low density than lead. And the density of a substance is defined as mass per unit volume. That means density is inversely proportional to the volume of that substance. Hence, a 10 kg piece of it will have a lar...Read More

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The correct answer to this question is C. Using A as the standard when B and D are rotated, the shapes and pattern match up with the form of A. When C is turned, it doesn't correlate with the others, which makes it the odd one out. This question would be found on IQ and logic...Read More

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The Answer for this one should be A. Saltpeter also known as Knitrate.

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C is the answer to this question. In order to solve this, you need to do some computations. You need to find the ratio of the mass of oxygen and the mass of the compound. You need to multiply this by 100. The given has a mass of 24 then add it to 16. It will become 16/40. This can still b...Read More

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