6th grade science please answer both ! :))

Chemistry

1 answer:

Elanso [62]3 years ago

4 0

Answer:

21. Erosion causes physical changes. For example - Land degradation, deforestation.

20. B statement is closely related to climate.

hope it helps!

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what is the best course of action if solid material remains in the flask after the heating step of recrystallization

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Answer:

filter the hot mixture.

Explanation:

Solid is stayed undissolved since the arrangement is gotten super saturated. On the off chance that solid molecule is available recrysallization won't happen in this way we need expel the solid molecule by filtarion in hot condition itself . Subsequently, arrangement become totally homogenous and recrysallization item will shaped by moderate cooling

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Which of the following is true?

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a. A reaction in which the entropy of the system increases can be spontaneous only if it is endothermic.

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The change in free energy (ΔG) that is, the <u>energy available to do work</u>, of a system for a constant-temperature process is:

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If <u>both ΔH and ΔS are positive</u>, then ΔG will be negative only when the TΔS term is greater in magnitude than ΔH. This condition is met when T is large.

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