If i pour sodium hydroxide to copper sulfate, would this be a physical or chemical change?

It would be a chemical change.
Hope this helps!

Hey there!

It would be a chemical change because a new substance was formed.

Hope it helped!

The higher the temperature, the increased rate constant for a reaction.(positive linear association)

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.