What happens at the melting point temperature of a substance? A) temperature change
B) phase change solid -> liquid
C) phase change liquid -> gas
D) Nothing occurs

Which of the dna typing techniques do you think you would choose if you had to analyze a dna sample? why?

Bridget is in science class. her teacher gives her two unknown substances and asks her to determine their relative ph. she places a piece of red litmus paper into both substances. the litmus paper turns purple when she places it into substance i. the litmus paper turns blue when she places it into substance ii. a. substance i is a neutral substance and substance ii is an acid. b. substance i is a neutral substance and substance ii is a base. c. substance i is an acid and substance ii is a base. d. substance i is a base and substance ii is a neutral substance.

How do you calculate the mass of a product when the amounts of more than one reactant are given?