Five groups of students in mr. walker's science class performed an experiment to determine the effect of salt on the boiling point of water. each group dissolved 5g of salt in 100ml of distilled water, heated the solution and recorded the boiling point with a thermometer that had divisions of 0.1â°c.

each group obtained exactly same boiling point for the salt solution, 100.8â°c. are the results valid?
a) no, because too little salt was used.
b)no, because it was not a controlled experiment.
c)yes, because each group obtained the same results.
d)yes, because the thermometer had divisions of 0.1â°c.

Heat is the amount of heat required to change the temperature of 1 gram of a substance by 1°c, and it is related to the chemical composition of the substance.

Ameadow ecosystem includes many species of grasses and small shrubs, several herbivores, and a few carnivores. a fungus colonizes the meadow and kills most of its vegetation. what is most likely to happen to the populations of herbivores and carnivores in the ecosystem? a. the populations of herbivores and carnivores will increase because there will be less competition for chemical energy. b. the populations of herbivores and carnivores will remain stable because the fungus cannot infect these organisms. c. the populations of herbivores will decrease because of vegetation loss, but the population of carnivores will remain stable. d. the populations of herbivores and carnivores will decline because less chemical energy will be stored in the ecosystem.

Rotenone is an insecticide that is toxic