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1 year ago

Scenes A and B depict changes in matter at the atomic scale:

Chemistry

1 answer:

kaheart [24]1 year ago

5 0

Scene B depicts chemical change in matter at atomic change.

Composition distinguishes a chemical reaction from a physical reaction. In a chemical process, the makeup of the components changes; in a physical change, the appearance, smell, or straightforward exhibition of a sample of matter changes without changing its composition. Despite the fact that we refer to them as physical "reactions," nothing is actually changing. A change in the substance in question's elemental composition is necessary for a reaction to occur. Therefore, from now on, we will simply refer to bodily "reactions" as physical changes.

Learn more about Chemical changes here-

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What type of salt would you get in a reaction between an oxide and hydrochloric acid?

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2 years ago

Swer questions 12 B D 12 Classify each model A-D as either an ele- ment, a compound, or a mixture. Explain your reasoning for ea

MrRissso [65]

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3 years ago

A new penny has a mass of 2.49 g and a volume of 0.349cm3. The density of copper is 8.94 g/mLA)Is the penny made of pure copper?

yawa3891 [41]

Answer:

Zinc metal might be mixed with the copper.

Explanation:

Density is defined as mass of the substance present in the unit volume of the substance.

$Mass=\frac{Mass}{Volume}$

Density of pure copper = d = 8.94 g/mL = $8.94 g/cm^3$

$1 mL = 1 cm^3$

Mass of the copper penny = M = 2.49 g

Volume of the copper penny = V = $0.349 cm^3$

Density of the copper penny = d

$d=\frac{M}{V}=\frac{2.49 g}{0.349 cm^3}=7.135 g/cm^3$

Density of pure copper > Density of zinc > Density of penny

$8.94 g/cm^3>7.14 g/cm^3>7.135 g/cm^3$

The metal mixed with copper is zinc to make a penny . This is so because all the other metal given have higher value of density which will increase the density of the copper penny if they were present.

But here the density of the copper penny is smaller than density of pure copper which means that less denser metal than copper is also added in the penny.

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3 years ago