1. manganese is a strategic mineral. in other words,
a. nations that want manganese must import it
b. world demand for manganese is greater than world supply
c. supplies of this mineral are unknown in quantity and location
d. manganese is a crucial element in weapons manufacturing

2. which of the following energy sources is most available at the edges of tectonic plates?
a. natural gas
b. geothermal
c. winds
d. tides

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.

because of all the things that happen around the us, many people get into arguments which sadly could get physical, but we should actually make a change for that.