What is the approximate hydrogen/hydronium ion concentration in a cup of tea? (1 point) What is the approximate hydroxide ion concentration in a cup of tea? (1 point)
Which is higher? (2 points)

What is the approximate hydrogen/hydronium ion concentration in bleach? (1 point)
What is the approximate hydroxide ion concentration in bleach? (1 point)
Which is higher? (2 points)

Unpolarized light falls on two polarizer sheets whose transmission axes are at right angles. a third polarizer is placed between the first two so that its axis makes a 52-degree angle with the axis of the first polarizer. a) what fraction of the incident light intensity is transmitted through the first polaroid? b) what fraction of the incident light intensity is transmitted through the second polaroid? c) what is the angle of polarization of the light that enters the third polaroid? d) what fraction of the incident light intensity is transmitted through the third polaroid. e) what happens if the middle polaroid is removed?

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?