Question:
A balloon filled with helium gas is set free and starts to move upward. Which of the following best explains why the helium balloon moves upward?
Answer:
The density of helium is less than the density of air.
Question:
The elements sulfur (S) and oxygen (O2) combine to form a substance called sulfur dioxide (SO2). Sulfur dioxide is also formed when coal and oil are burned. Sulfur dioxide can best be described as
Answer:
a compound
Question:
Which of the following best describes the purpose of the chromosomes in the nucleus of a cell?
Answer:
to store the genetic instructions needed to specify traits
Question:
A 10 g sample of aluminum and a 10 g sample of iron were each heated by 100 joules of energy. The temperature of the aluminum sample rose 11C, while the temperature of the iron sample increased 23C. Which statement best accounts for these results?
Answer:
The specific heat of iron is less than that of aluminum.