Which of the following is true of a chemical reaction?
A) In a chemical reaction, the number of moles of product always equals the number of moles of reactants.
B) In a chemical reaction, the mass of the products always equals the mass of the starting materials that have reacted.
C) Both a and b are true.
D) Both a and b are false.
B
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The main source of power for steam engines and blast ovens is produced from
A) iron ore. B) biomass fuels. C) wood. D) coal. E) dross.
Where are basaltic magmas generated?
A. In the lower crust B. In the lower mantle C. In the upper mantle D. In the upper crust
Which action is responsible for leaving the largest areas of topsoil unprotected and thus vulnerable to erosion?
A. agriculture B. flooding C. windstorms D. volcanoes
What type of reaction occurs when an acid reacts with an active metal?
A) double displacement B) neutralization C) precipitation D) redox