A semiconductor is a substance, usually a solid chemical element or compound, that can conduct electricity under some conditions but not others, making it a good medium for the control of electrical current. Silicon is a very common element -- for example, it is the main element in sand and quartz.
Answer:
-40.0 °C
Explanation:
Change in temperature can be written as 
. The variables are defined below here:
means change in temperature.
means the final temperature value.
means the initial temperature value.
From the question, we know the temperature changes <em>from</em> 65.0 °C <em>to </em>25.0 °C. Therefore, our initial temperature is 65.0 °C and final temperature is 25.0 °C.
Hence:
Therefore, the change in temperature is -40.0 °C.
A Giant covalent is a structure that contains a lot of non-metal atoms. And each non-metal atom is joined to adjacent atoms by covalent bonds. A diamond is an example of a giant covalent.
Some benefits are that DDT helps us grow crops and keeps pests off our crops.
But DDT is harmful to the environment. If it gets into the water ways then if can harm fish and animals that eat the fish such as birds.
