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nata0808 [166]
3 years ago
13

Which element is used in light bulbs as filament

Chemistry
1 answer:
Sergeeva-Olga [200]3 years ago
8 0
The answer is tungsten.
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A chemist requires 0.802 mol Na2CO3 for a reaction. How many grams does this correspond to?
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Ok:

Explanation:

So grams = mols*MolarMass. Here, MolarMass (MM) = 105.99g which can be found using the periodic table. mols is given to be 0.802. We can then plug in to get that it corresponds to 85.0g.

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Which one of the following statements BEST describes a chemical reaction?
Natalija [7]

Answer: The correct statement is (A new substance is formed and the process can usually NOT be undone.)

Explanation:

A chemical reaction is simply defined as the reaction between two or more elements in which a new substance is formed and the process can usually not be undone. Different types of chemical reaction includes:

-- combination reaction: this occurs when two or more reactants form a product. For example: In the burning of coal, It combines with oxygen to produce carbon dioxide. Also in the burning of wood, carbon dioxide is given off and ashes are formed. Because new substance is being formed, they often can't be undone. The ashes formed can't be changed back into wood. Other types of chemical reaction are listed below.

-- Decomposition reaction

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For the product of a chemical reaction to be undone (reversed), it has to undergo another chemical process different from the one that produced it.

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How do microwaves help heat frozen food?
hodyreva [135]

Answer:

Microwaves cook food by heating the liquid water it contains. Even frozen food contains some liquid water, at least on the outside surface exposed to warm air on the way from the freezer to the oven.

Explanation:

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The electron cloud model describes the __of electrons in an atom.
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