Decide if each of the
statements about the
indicator is true or false

Use the images of
flasks to help you
choose the correct
answers.

True
False

1 The phenolphthalein indicator is not affected by the pH of the
solution
2. The phenolphthalein indicator changes colour close to the point
of neutralisation which shows the end-point of the titration
3. When adding acid to base the phenolphthalein indicator changes
colour from colourless to pink at the end of the titration.

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of tthe table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.