True or false 9.Circuit breaker is used to protect the user of appliance from an electrical shock.

10.Earthing or Grounding involves attaching to the ground a conductor in one line of the circuit to make that line electrically common with the earth. *

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.

Ants live on acacia trees in south america. the ants feed on sugars secreted by the trees. the trees provide room for the ants to live. the ants sting any other insect or animal that comes to eat the trees. what type of relationship is this?