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Chemistry Questions and Answers (Q&A)

The correct answer to this question is A. When dealing with pressure, you need to count the number of moles on both sides of the equation. If there is an increase in pressure, the reaction favors the direction with the lower number of moles.

If there is a decrease in pressure, the reaction will favor the direction with more moles of molecules. Because there are 2 moles of substance on the left and 1 on the right, if the pressure is increased, the reaction will favor the side with less number of moles of molecules, which in this case is the forward reaction.

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The correct answer to this question is B, it has 80 mol of atoms. Mol, also known as moles or Avogardro's number, are an amount unit used in chemistry. It is the mass of a substance, which would contain the same number of units in an atom. These units could be formula units, atoms, or molecules.

The mol allows a chemist to translate atoms, ions, and molecules into grams, kilograms, and tons. It can also be used to predict how much product is needed for a specific reactant. Mol can be calculated using the following formula: 1 mole = 6.022 × 1023 particles/mol = formula weight expressed in grams

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The answer is D. This is Rutherford’s experiment where he wanted to prove the existence of a nucleus in an atom. Ernest Rutherford along with his students Ernest Marsden and Hans Geiger bombarded alpha particles into a very thin gold foil and had an observation that 1/8000 of the particles deflated at a large angle.

They observed it under a microscope on a screen of zinc sulfide in the dark. It was then they confirmed that strong electric fields exist. He then concluded that a positive-charged atom lies in a compact and solid nucleus. This nucleus concentrates almost the whole mass of the atom but occupies only hundred millionth of a millionth of the atom’s volume.

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The atmosphere because the phsphorus cycle only take splace with rocks, water, and soil.

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The best term to describe the pair of compounds shown in answer C. The same compound. A compound is made of contrasting elements in definite proportions. Some examples of these elements include iron, copper, hydrogen, and oxygen. A compound is a material formed when two or more elements are joined together.

A compound may be scientifically defined as a substance consisting of atoms or ions or two or more elements that are different and in exact proportions joined by chemical bonds. Compounds have their properties that are unique from the elements they are made. A compound is a type of molecule with more than one element.

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Water is a solvent. It has numerous properties that set it apart from other solvents. The basic one is its property of surrounding different ions so that molecules break into separate charged entities within it. However, this property of breaking up molecules into ions is also dependent on the property of the solute. If it is a strong solute, the water will surround all the different ions making it fully ionized.

However, if the electrolyte is weak, it means that the molecule tends to stay in its non-ionized form. Hence, few ions will form. This chemistry applies to all electrolytes.

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The correct answer to this question is B, square planar. While IF4- has an octahedral electron geometry, the molecular geometry of IF4- takes on a square planar shape. The cause of this is that iodine carries two lone pairs, with one above the plane on the x-axis and one below the plane on the x-axis.

Due to their negative charges repeling against one another, these lone pairs occupy opposite electron domains, canceling out when acting upon the fluorines and, thus, creating the square planar shape. THe fluorine molecules surround it at right angles to each other, approximately bonding at 90 degrees.

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The correct answer to this question is D, potassium oxide. This is the correct name because Potassium (the K) is a metal with one valence electron while Oxygen (the O) is a nonmetal with two valence electrons. Thus, K2O is the ionic compound that is composed of oxygen and potassium.

K2O is a pale yellow solid, is a very rarely encountered, is a immensely reactive compound, and is the simplest oxide of potassium. Even combining K2O with water cause a violent reaction. Sometimes fertilizers and cement include the K2O compound, which is often criticized as it is considered to be unsafe and harmful.

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