10.0 mL sample of 0.75 M C3H6O3 (lactic acid) is titrated with 0.25 M KOH. What is the ratio of conjugate base to weak acid, at the point where 15.0 mL of KOH has been added during the titration

Which characteristics can be used to differentiate star systems? check all that apply.

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.