If agno3(ag), naoh(aq), and hci(ag) were all clear after being added to an unknown substance in separate test tubes (filled with that unknown substance), what could that unknown substance in the test tubes possibly be?

The substance could be NaCl

Explanation:

If we added NaCl,to a solution of AgNO3 the reaction will be:

AgNO3 + NaCl > AgCl + NaNo3

A white precipitate forms, in this case the AgCl.

The reaction we are observing is that of precipitation.

the molecules move in straight line until they collide with each other or with the walls of the container. collisions are perfectly elastic; when two molecules collide, they change their directions and kinetic energies, but the total kinetic energy is conserved.

explanation:

what is the general relationship between a galaxy's distance from earth and its speed?

the answer is:

the farther away a galaxy is from us, the faster it is moving away from us.