Suppose 10.0 ml of 2.00 mnaoh is added to (a) 0.780 l of pure water and (b) 0.780 l of a buffer solution that is 0.682 min butanoic acid (hc4h7o2) and 0.674 min butanoate ion (c4h7o2–). calculate the ph of (a) and (b) before and after the addition of the naoh. assume volumes are additive. (ka, hc4h7o2= 1.5 × 10-5)

Acontrol during an experiment. might change remains constant does not exist does change

Juju.01) 5 geologic events a group of students designed an experiment in an ice rink to represent the solar system. the steps of the experiment are listed below. 5: geologic events 1. choose a student to represent the sun. the planets are represented by two tennis balls. 2. ask the student to hold the tennis balls in each palm and spin on the ice with arms stretched out. 3. ask the student to draw in the arms after about 10 spins. 4. observe the student's arms rotate faster when they are closer to the body. 05 geologic events enors) the experiment most likely demonstrates that (2 points) 07 discussion-based sessment/module planets exert gravitational force on the sun the sun exerts gravitational force on the planets 3.07 discussion-based ssessment speed of a planet depends on its distance from the sun new version available! (3.0.119) get it now submit 18.07: module exam description

The point along a planet's orbit where it is closest to the sun is called the