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Allushta [10]
3 years ago
15

A substance undergoes a change. Which statement indicates that the change was a chemical change?

Chemistry
1 answer:
romanna [79]3 years ago
5 0

Answer:

Chemical change is represented by change in smell, temp., presence of gaseousness/bubbles, and change in color

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Sally fell off of her bike and scraped her knee. What cellular process would aid in the healing of her scrape? Group of answer c
kotegsom [21]

Answer:

Mitosis

Explanation:

you scrape your knee and the skin repairs itself

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2 years ago
1. How does adding energy to a solid affect the motion of the particles? 2. How can a gas at room temperature (like oxygen) beco
Oksanka [162]
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Which button is a shortcut for scientific notation on<br> a scientific calculator?
Svetlanka [38]

Answer: For many calculators, including the TI –83 and TI 83 Plus, the [EE] button is used to enter scientific notation. The [EE] button can be found in yellow above the comma key [,].

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How do u think the hardness and the density of a mineral that formed through metamorphism would compare to a mineral that formed
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3 years ago
Based on the equation, how many grams of Br2 are required to react completely with 72.4 grams of AlCl3
svlad2 [7]

Answer:  131 g of bromine is required.

Explanation:

The balanced equation will be :

2AlCl_3+3Br_2\rightarrow 2AlBr_3+3Cl_2

To calculate the moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}

moles of AlCl_3

\text{Number of moles}=\frac{72.4g}{133g/mol}=0.544moles

According to stoichiometry :

2 moles of AlCl_3 require  = 3 moles of Br_2

Thus 0.544 moles of AlCl_3 require=\frac{3}{2}\times 0.544=0.816moles  of Br_2

Mass of Br_2=moles\times {\text {Molar mass}}=0.816moles\times 160g/mol=131g

Thus 131 g of bromine is required.

5 0
2 years ago
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