ACTScienPractice4

Based on the passage, which of the following statements best describes where Student 1 and Student 2 disagree?

Assuming that both students' statements are correct in describing the ideal gas law, how would we then describe the effects of molecule size and IMFAs on a gas's volume?

An experiment was carried out that measured the volumes of two very small quantities of gases, hydrogen and tetrachloromethane. Both gases have a dipole moment of zero, meaning they do not exhibit intermolecular forces of attraction. Hydrogen is the lightest known gas, while tetrachloromethane is much heavier and therefore has much larger molecules.

The experiment yielded the following result: the same number of hydrogen molecules occupied a slightly different volume than an equivalent quantity of tetrachloromethane. This remained true only for small quantities of both gases.

What does this experimental data mean with regard to the opinions of the two students above?

Enzymes (large molecules) serve to catalyze, or speed up, chemical reactions in the human body. This process of catalysis begins with the binding of a substrate (the reactant) to the active site of an enzyme. This active site is simply the portion of the enzyme that interacts with the substrate. Following the binding event, products separate from the enzyme active site, at which point the enzyme is prepared to undergo another reaction cycle. Two scientists offer conflicting views on the nature of the enzyme-substrate interaction.Which model of the enzyme-substrate interaction would require a highly flexible enzyme?

Assuming Scientist 2 is correct, one would be least likely to find which of the following in the active site when an enzyme initially binds its substrate?

The Environmental Protection Agency compiled the following information about heavy metals in drinking water. Heavy metals are toxic, and thus must be monitored very closely. All amounts are given in parts per billion (ppb), a common measurement of concentration for trace contaminants. Figure 1 shows total heavy metal contamination in each city as a makeup of various percentages of specific contaminants. Figure 2 shows specific amounts of contaminants (with the same color coding) in ppb as well as total contamination level in ppb.

The Environmental Protection Agency (EPA) limits the concentration of antimony to 6ppb. Which city is most likely in violation of this statute?

A student is choosing an enzyme to use in order to complete a chemical reaction. Based on the diagram of enzyme kinetics, which enzyme should the student use?

A student is choosing an enzyme to use in order to complete a chemical reaction. Based on the diagram of enzyme kinetics, which enzyme is more efficient?