A solution of hydrochloric acid is placed on a balance. Magnesium metal is added and the mass is recorded. The solution is stirred and the mass of the solution is recorded every 10 minutes. The following data is collected:

Time (mins) Mass of Hydrochloric Acid and Magnesium (g)

0 160.0 g

10 156.5 g

20 152.0 g

30 147.5 g

40 142.5 g

What does the data show is occurring?

The hydrochloric acid and magnesium metal react to form a soluble compound.

The hydrochloric acid and magnesium metal do not react.

The hydrochloric acid and magnesium metal react to form a precipitate.

The hydrochloric acid and magnesium metal react to form a gas.

Question

Physics

Jaylen Winters

19 April, 17:05

A solution of hydrochloric acid is placed on a balance. Magnesium metal is added and the mass is recorded. The solution is stirred and the mass of the solution is recorded every 10 minutes. The following data is collected:

Time (mins) Mass of Hydrochloric Acid and Magnesium (g)

0 160.0 g

10 156.5 g

20 152.0 g

30 147.5 g

40 142.5 g

What does the data show is occurring?

The hydrochloric acid and magnesium metal react to form a soluble compound.

The hydrochloric acid and magnesium metal do not react.

The hydrochloric acid and magnesium metal react to form a precipitate.

The hydrochloric acid and magnesium metal react to form a gas.

+5

Answers (1)

Know the Answer?

Jared Olsen · Answer 1

Remember conservation of mass. Mass can't just suddenly show up or disappear. It has to come from somewhere, and it has to go somewhere.

The mass of this mixture/solution is decreasing as time goes on. That

means that some mass is going somewhere, out of the dish and away

off the scale.

- - React to form a soluble compound?

Maybe, but that doesn't take mass away

- - They don't react?

Maybe, but that doesn't take mass away

- - React to form a precipitate?

Maybe, so big deal. It sinks to the bottom. It doesn't take mass away.

- - React to form a gas?

If that happens, then the gas carries mass away!

That must be it!