Which of the following is an example of only a physical change?(1 point)
a) Boiling water to form steam
b) Dissolving salt in water
c) Burning a piece of wood
d) Rusting iron
Which of the following is an example of only a physical change?(1 point)
the green color of the Statue of Liberty
dry ice becoming vapor
the smell of rotten eggs
the creation of table salt
dry ice becoming vapor
Which of the following demonstrates a chemical change?(1 point)
dry ice vaporizing steam
condensing on a mirror
iron (Fe) reacting to water(open paren cap h sub 2 cap o close paren) and oxygen(O) to form iron oxide
sugar and water mixing to create sugar water
iron (Fe) reacting to water (H2O) and oxygen (O) to form iron oxide
Which of the following is a reliable way to observe that a chemical change has occurred when two substances come in contact with one another?(1 point)
a) Seeing a color change or formation of a precipitate
b) Feeling a change in temperature
c) Observing the release of gas bubbles
d) All of the above
The correct answer is: d) All of the above
Which of the following is a reliable way to observe that a chemical change has occurred when two substances come in contact with one another?(1 point)
observe a color change
monitor for the release of a gas
test for the release of heat
conduct a test to determine the chemical makeup of the molecules