Sudhi is studying the motion of a toy car. She places the car in the middle of the ramp and releases it. which best describes the reference point in this scenario?

A: the top of the ramp

B: the bottom of the ramp

C: the ending position of the car

D: the starting position of the car

Match the name of the following compound:   mgso4  · h2omagnesium sulfate monohydratemagnesium (ii) sulfate monohydratemagnesium (ii) sulfate hydratemagnesium sulfate hydrate

Avariable that is not being directly tested during an experiment should be

The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.