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otez555 [7]
3 years ago
6

Iron and oxygen react together to make iron (III) oxide (rust). You know that this is a chemical reaction and not a nuclear reac

tion because:
a large amount of heat is produced by the reaction
the individual atoms are rearranged but do not change identity
new products are formed as a result of the reaction
the rust has a greater mass than the iron and oxygen used to produce it
Chemistry
2 answers:
Alona [7]3 years ago
7 0
The atoms didn't change we only added 2 different ones together. 2nd one is right
viva [34]3 years ago
6 0

Answer:

The individual atoms are rearranged but do not change identity

Explanation:

Hi, identity of an element is given by the amount of protons it has in its nucleous: two different elements must have different amounts of protons.

During a chemica reaction, such as the one between oxygen and iron, the atoms of the two elements create bonds but no a new element: they identities remain intact, so this is not a nuclear reaction

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What is the percent composition of the u.s quarter, which has the mass of 5.670g
Vitek1552 [10]
The percent composition of each element can be calculated as follows:
% composition = (mass of element / total mass) * 100

The total mass of the quarter is given to be 5.670 grams
Mass of Cu = 5.198 grams
Mass of Ni = 0.472 grams

Substitute in the above equation to get the mass percentage of each element as follows:
% of Cu = (5.198/5.670) * 100 = 91.675%
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3 years ago
In the PhET simulation window, click the radio button labeled Mystery in the Blocks menu on the right-hand side of the screen. U
Yuliya22 [10]

Answer:

B, D, E, C, A

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We have 5 blocks with their respective masses and volumes.

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  A                65.14 kg       103.38 L

  B                0.64 kg         100.64 L

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  E                 3.53 kg         101.00 L

The density (ρ) is an intensive property resulting from dividing the mass (m) by the volume (V), that is, ρ = m / V

ρA = 65.14 kg / 103.38 L = 0.6301 kg/L

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ρC = 4.08 kg / 104.08 L = 0.0392 kg/L

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ρE = 3.53 kg / 101.00 L = 0.0350 kg/L

The order from least dense to most dense is B, D, E, C, A

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False is the correct answer
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Answer: crystalline solid

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