Your answer may include the following changes. Select each of the changes that you included in
your answer.
Heat the metal until it melts (physical
change)
Attempt to react the metal with oxygen
(chemical change).
Stretch the metal into a wire (physical
change)
Attempt to react the metal with acid (chemical

Maria wants to determine which type of disinfectant kills the most bacteria. which of the following is the best way for maria to determine this? a. ask ten different companies that make disinfectants which type is best. b. put the same amount and species of bacteria on ten identical plates, and add ten different kinds of disinfectant to each plate. c. interview ten different people to determine which type of disinfectant they prefer. d. put the same amount and species of bacteria on ten identical plates, and add a different disinfectant to each plate.

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?

Question 3(multiple choice worth 4 points) (04.04 lc) what does it mean when an element is reduced? it empties a valance shell, reducing its atomic radius. it gains electrons, reducing its overall charge. it increases electronegativity, reducing its ability to bond. it loses electrons, reducing its electron number.