Hydrochloric acid, magnesium metal and universal indicator solution are added to a beaker.
Observations were made: A gas was produced, the beaker got hot, the metal dissolved and the color
changed from red (highly acidic) to yellow (slightly acidic). Based on these observation, what do you think happened, and what was responsible for each different observation.

Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal.b. he is determining chemical properties that are sufficient to identify the metal.c. he is determining physical properties that are insufficient to identify the metal.d. he is determining chemical properties that are insufficient to identify the metal.

What is the subscript for oxygen in its molecular formula

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit