18
When 50.0 mL of water con-
taining 0.50 mol HCl at 22.5°C
is mixed with 50.0 mL of
water containing 0.50 mol
NaOH at 22.5°C in a calorime-
ter, the temperature of the
solution increases to 26.0°C.
How much heat (in kJ) was
released by this reaction?

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .