Please help me it's for 25 points and I will mark brainliest

Mg + 2HCl → MgCl2 + H2
1. Is the equation above balanced? How do you know?

2. Give an example of a substance changing temperature and what happens to the motion of molecules as the temperature changes?

Aballet student who learns with the of his instructor is demonstrating learning.

Use the information presented in the graph to answer the questions. which segments show acceleration? which segment indicates that the object is slowing down? what is the velocity of segment b? what is the acceleration of segment b?

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?