Which of the following household appliances is designed to directly convert electrical energy to heat energy?
A.
a can opener
B.
a stove
C.
a garbage disposal
D.
a fan

Explain why scientists use shared characteristics to make cladograms.

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.