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bogdanovich [222]
3 years ago
14

In what type of change is matter conserved?

Chemistry
2 answers:
prohojiy [21]3 years ago
7 0
Both physical and chemical
lawyer [7]3 years ago
7 0

Answer:

C. Physical and chemical

Explanation:

Matter can be conserved in both physical and chemical changes.

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How many molecules of CF₂Cl₂ are in 45.7 grams of CF₂Cl₂? (Show work)
posledela

Answer:

The answer to your question is: 2.20 x 10 ²³ molecules

Explanation:

Data

mass = 45.7 g

molecules of CF₂Cl₂ = ?

Process

1.- Calculate the mass number of CF₂Cl₂

   C = 12    F =2 x 19    Cl = 2 x 35.5

   total = 12 + 38 + 71

   total = 121 g

2.- Use the Avogradro's number to solve the problem

                       121 g -------------------  6.023 x 10²³ molecules of CF₂Cl₂

                        45.7 g ---------------     x

                        x = (45.7 x 6.023 x 10²³) / 121

                        x = 2.75 x 10²⁵ / 121

                        x = 2.20 x 10 ²³ molecules

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6. Using the rules of significant figures, calculate the following:
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A. 3

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Why does acetic acid lose its buffering ability at very high pH values? Why does acetic acid lose its buffering ability at very
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Being for the formic acid the pKa 3.74, the optimal effective range is between 2.74 and 4.74.  Upper or lower these range a formic acid/potassium formate buffer does not work.

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