A star's brightness tells us
A. its surface temperature.
B. how much energy a star produces.
C. its rotational speed.
D. both how much energy it produces and its surface temperature.
Answer: B
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Indonesia represents a nation in which
A) women are now having smaller families because of economic and social service constraints. B) there are excellent social services and employment opportunities for the middle income families. C) there is a high level of affluence, and women marry late and have large families. D) most people are subsistence farmers, poverty is widespread and both family size and child mortality are very high.
Which of the following is not a proper symbol for an element?
A) C B) Ca C) CO D) Co
When a strong magnet is brought near to a sample which is known to contain both iron and sulfur the iron and the sulfur are not separated from one another. What type of material is this sample?
A) a compound B) a homogeneous mixture C) a heterogeneous mixture D) There is insufficient information to answer.
Which of the following will be formed when an amine and a carboxylic acid react at room temperature?
A) an amide B) an amino acid C) an ammonium carboxylate salt D) none of these