Match the following. Match the items in the left column to the items in the right column. the starting materials completely lose their properties to form
1.
chemical change
new substances
2. a change from one state of matter to another
physical change
3.
a change in shape, size, or physical characteristics but
remaining same substance
molecule
4
4.
.
a pure compound consists of exactly the same elements in
the exact same ratios by mass
Law of Constant Composition
5. The smallest unit of a compound
2
phase change
M

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.

How have the greenhouse gasses increased from the year 2000 to 2018

How many mmols of tris-hcl are there in 100 ml of a 100 mm tris-hcl buffer solution at ph 8.1? note that the 100 mm refers to the sum of tris and tris-hcl concentrations?