An engineer decides to develop technology that will decrease sound
pollution due to highway traffic noise. what step of the engineering processes
did she just undertake?

a. make a plan

b. know the background.

c. identify a need.
d. test and evaluate.

Name the element in group 17, period 2. (periodic table)

Which symbol can be used to indicate the pressure at which a chemical reaction is carried out? 25°c 2 atm pa

What is a main difference between a mixture and a pure substance? a mixture is only a liquid, but a pure substance can be in any state. a mixture looks the same throughout, but a pure substance does not.1 a mixture can vary in composition, but a pure substance has a set composlo a mixture can be made up of a single compound, but a pure substance car