What is the answer to this one?

Answers

Answer 1

Answer: maybe number 2. 20 hope that helps

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The melting of gold is a physical change.why?

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Because when a matter melts (or generally speaking, changes phases) its chemical structure does not change. By change of chemical structure I mean, reaction. When a matter melts it does not react with another one. It does not, give or take electrons to another matter or it does not share with them.

Melting gold can be reversed. Physical changes are ones that can be reversed, like bending a paperclip or getting whacked with a hammer and getting a dent. Chemical changes can't be reversed: like burning wood, or baking bread.

Is combustion an example of the law of conservation of matter and why?

Answers

Answer:

Explanation:

The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction. For example, when wood burns, the mass of the soot, ashes, and gases, equals the original mass of the charcoal and the oxygen when it first reacted.

Given the reaction below, which is the oxidized substance? Mg + Cl2 mc005-1.jpg Mg2+ + 2Clmc005-2.jpg 2CI- CI2 Mg Mg2+

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A oxidation-reduction reaction, also known as redox reaction, is a reaction which involves transfer of electrons between species. It is a reaction where there are changes in the number of the oxidation number by gaining or losing electrons. From the reaction, the oxidized substance is magnesium. It was oxidized from an oxidation number of 0 to +2.

Answer:

Mg ( C )

Explanation:

In the following reaction, C6H6)? 2C6H6 + 15O2 12CO2 + 6H2O, how many grams of oxygen will react with 10.47 grams of benzene?

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the answer is 27.92g . working is shown in the picture above.

What do sound waves, light waves, and ocean waves all have in common?A.
They all transfer energy.

B.
They are all electromagnetic waves.

C.
They all require a medium to travel.

D.
They are all mechanical waves.

Answers

The answer is option A

What group of elements least strongly attract electrons from other atoms in a compound

Answers

well there are two possibilities. The noble gases technically have the lowest electronegativitey, but often they are referred to as being non reactive and stable. In which case for elements that are reactive group 1 has the lowest electronegativitey and tends to lose its electron.

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Which molecule contains a triple covalentbond?(1) H2 (3) O2(2) N2 (4) Cl2

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47.0ml of a HBr solution were titrated with 37.5ml of a 0.215M LiOH solution to reach the equivalence point. what is the molarity of the HBr solution

Why does coal usually produce more soot than other fossil fuels when burned?