Amixture is a physical combination of two or more different substances, regardless of how much you have of each. mixtures can be separated using physical means. that is, chemical reactions are not necessary to separate the different mixed-up components. for example, let’s say you have a mixture of 100 iron-rich magnetic particles and 100 grains of table salt. come up with at least three different ways to separate the particles and grains. hint: think of some of the physical properties of these substances.

An exothermic reaction is conducted in an insulated calorimeter filled with water. the calorimeter is then sealed so that there is no heat exchanged between the contents of the container and the surrounding air. which of the following statements is true about the reaction?

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.

Identify the electromagnets with poles that are reversed from the electromagnet shown above