Maria found an unknown chemical in her cleaning cabinet. She knows that the chemical is either HCl or Mg(OH)2. She decides to test the chemical to help her classify the chemical. The pH measured 11 and the chemical did not affect a piece of blue litmus paper. Is the chemical HCl or Mg(OH)2? * 2 points
The chemical is an acid and must be Mg(OH)2.
The chemical is a base and must be HCl.
The chemical is an acid and must be HCl.
The chemical is a base and must be Mg(OH)2.

Much of the information taught in earth-space science would not be available if it weren’t for our remote sensing abilities. explain two ways our remote sensing strategies contribute to our knowledge of these topics.

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.

What is friction? how does it affect the motion of an object?