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Chemistry Questions and Answers (Q&A)

A. A combination reaction is when two compounds combine to form a single one. A displacement reaction would cause one element to push out or displace another element. And take its place. This type of chemical reaction would be shown as A+ BC= B + AC. A decomposition reaction would be one where the compound is broken into smaller pieces.

This type of chemical reaction would be shown as AB= A + B. These can require energy to create this break.A precipitation reaction is when a solid is created from two liquids. An example would be mixing silver nitrate with sodium chloride and ending with a solid.

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In a conductor, electric current can flow untethered, in an insulator it cannot flow. Metals such as copper are good energy conductors, while most non-metallic solids are good resistors, having an extremely high blockage to the flow of charge through them. Most atoms hold their electrons tightly and are insulators.

In chemistry, a non-metal is a chemical element that mostly lacks metallic attributes, and they are poor conductors of heat and electricity. In other words, they cannot be easily reshaped. The contrast in resistance due to the material is called resistivity. Non-metal, such as carbon and iodine do not conduct electricity. In non-metals, the bonding is strong, and electrons are not free to move around.

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Because a tin plate is dense and resistant to prevent further oxidation, if you take a noncorroding material, such as brass and scratch away some of the surface exposing new material, then the oxide layer closes up immediately and helps protect the material. If iron is a contact with a more corrosion resistant metal such as tin, copper or lead, the other material can act as a large cathode that significantly increases the rate of reduction of oxygen.

It is because the oxidation of iron perpetuates the reduction of oxygen, which can result in a dramatic increase in the rate at which iron is oxidated of iron. Corrosion is a process by which metals deteriorate through oxidation. Out of all the metals vulnerable to corrosion, iron is by far the most important. A common cause of damage to metal objects is by poor storage, where objects are piled on top of each other, causing scratching.

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Increases

increase of protons in nucleus also increases size

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It's 107g because when you follow the graph, it makes sense.

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The correct answer is option D
First, let’s calculate the mass of water
Mass of water = 295ml 0.997g/ml
= 294 g
To calculate % by mass of potassium nitrate in the solution
% by mass = (45 100) / (45 + 294)
= 13.3%
Hope you find this helpful

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Due to the formation of ironoxide is this answer suits for first option

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The answer to this is letter A. In order to find the answer, you can just refer to the numbers given plus the given reaction. These will be your clues about what you should do to solve this. It can be confusing for a lot of people especially when the answers can be positive or negative.

It will depend on the given reaction and what is being solved. Is the initial reaction that is most important? Are you trying to look for the reaction rate or the time that is needed in order to get a reaction? These are details that you cannot overlook when you solve this question.

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