Question

** Which is a correct method used in a scientific experiment involving acid and base solutions?**


using a pH test strip to measure the oxygen content of a solution
adding an indicator to a solution to test its acidity
adjusting the recorded pH measurements to prove the hypothesis
measuring the pH of a test strip by dipping it into an indicator

Answer 1

wrong question sorry

Answer 2

A student thinks that the more protons an atom has, the more reactive it will be. Which will best disprove this student's idea?

Compare the reactivities of lithium (Li) and krypton (Kr).
Note that rubidium has 48 neutrons.
Compare the number of protons in cesium (Ce) and xenon (Xe).
Count the number of neutrons in an atom of helium.

Answer 3

first one

Answer 4

because Krypton obviously have more proton (higher atomic number), but since it's a noble gas, its reactivity is really low, virtually non-existent