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my last 2 chemistry question.
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Ответ:
1. filtration and evaporation
2. i) water is added to the sand and salt mixture
ii) then the mixture is filtrated and so the sand and the salt water was seperated
iii) the salt water is heated with the help of burner until the water gets evaporated
iv) after the water gets evaporated, the salt is remained in the container
3. observation:
on adding water to the mixture, the salt is completely dissolved in the waterwhen filtrated the sand is seperated from the salt waternow the salt water when heated with the burner until the evaporation, the water is evaporatedthe salt is precipitated and remained in the container4. cautions:
while using the burner, we should be cautious with firethe container that is heated should be holded with the help of a cloth to avoid heatОтвет:
B. 57°F
Step-by-step explanation:
Given:
F = n/4 + 37
Where,
F = temperature in degrees Fahrenheit
n = number of times per minute crickets chirps
Find F when n = 80
F = n/4 + 37
F = 80/4 + 37
= 20 + 37
= 57
F = 57 °F
B. 57 °F