Which solution is the most concentrated?
A.50 g of NaCl / 100 g H20
B.15 g of Naci/ 100 g H2O
C.83 g of NaCi / 100 g H20
D.27 g of NaCi / 100 g H20

Which is an example of gaining a static charge by conduction? a) rubbing a balloon against your hair. b) shuffling your shoes across a carpet. c) bringing a charged rod near an electroscope. d) touching your car on a cold day and getting a shock.

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.

The frequencies refer to the sample data collected from a population of interest when performing a hypothesis test comparing two or more population proportions.