Glass has a hardness that is in the middle of the hardness scale. What is the hardness of Glass?

hardness 9

hardness 8

hardness 5

hardness 10

Describe the redox reaction. Check all that apply 2AI (s) + 3ZnCI2 (g) → 3Zn (s) + 2AICI3 (aq). Aluminum atoms transfer electrons to chlorine atoms. Zinc is reduced. Zinc is the reducing agent. The oxidation number of chlorine does not change.

What trend does the first ionization energy follow, going down the periodic table? A. The first ionization energy increases because there are more electrons in the atom. O B.

Leonard designed a parallel circuit to light two light bulbs. But his circuit doesn't work. Which two items in the circuit must be addressed for the lightbulbs to light as planned

Checking the dining areas of an eating establishment for evidence of flaking paint, broken light bulbs, and wood damage will reduce the chances of:

Molar mass is measured in units of what?

Which explanation best describes a wave? A. a disturbance that travels through a medium with a transfer of energy and matter B. a disturbance that travels through a medium without a transfer of energy and matter C.

The requirements for one type of atom to substitute for another in a solid solution are:

How could you separate items that are different densities? explain

Why do elements within a period of the periodic table have different properties

A professional technician maintains and operates specialized scientific equipment. True False