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Harlamova29_29 [7]
3 years ago
9

16.

Chemistry
1 answer:
mixas84 [53]3 years ago
8 0

Answer:

Explanation:

When going from top to bottom in any group of the periodic table, the atomic radius always tends to increase

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17) 8.4 / 20 x 100

18) 20 . 0.5150

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What energy change occurs during condensation? Please answer, i’ll give you brainliest !
kupik [55]

Answer:

Please see Explanation and Attachment (Heating Curve for Water)

Explanation:

Energy change associated with phase change in substances is either endothermic (energy added to system) or exothermic (energy removed from system). Condensation is but one term in six (6) describing phase change occurring when energy change is involved. The following table, in general, summarizes the related effects of energy change as applied to phase change.

Process                   Phase Change         Energy Change*

Condensation         gas => liquid             Exothermic

Evaporation             liquid => gas            Endothermic

Freezing                  liquid => solid           Exothermic

Melting                    solid => liquid            Endothermic

Sublimation            solid => gas                Endothermic

Deposition              gas => solid               Exothermic

_____________________

* Energy Change terms:

Endothermic => Addition of heat energy

Exothermic => Removal of heat energy

7 0
3 years ago
Help please
Serggg [28]

Answer:

part a: How much of the isotope will you have left after 10 years?

  • 100/2 = 50 g

part b: How much of the isotope will you have left after 20 years?

  • 50/2 = 25 g

part c: How many half-lives will occur in 40 years?

  • 40/10 = 4
8 0
3 years ago
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