What is the concentration of a stock solution if 20 mL was used to make 400 mL of a 1.44 M solution? Group of answer choices

40 M

50 M

30 M

5 M

When a comet collides with earth, it adds material to our planet and causes great damage. therefore, a collision like this is a a. destructive force b. constructive force c. geologic process and event d. constructive and destructive force

What is the polyatamic ion of borate

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