Match the term with each description: 1. Acid

2. Alkaline

3. pH

4. Ion

Answer choices:

A.) An atom or molecule that has a positive or negative charge

B.) A value from 0 to 14 that is used to specify how acidic or basic a compound is when it is

C.) A compound that increases the hydroxide ions (OH-) when it is dissolved in a solution

D.) A compound that increases hydrogen ions (H+) when it is dissolved in a solution

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.

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s.part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.

What characteristics of hv2112 make it the best candidate to be classified as a thorne-zytkow object?