ACTScienPractice4

Multiple Choice

According to the data in the table, what is the apparent relationship between specific heat and the amount that an object's temperature changes when a given amount of heat is added?

• The data for specific heat is needed to discern a relationship.

• There is no apparent relationship.

• A positive correlation.

• A negative correlation

Multiple Choice

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

• Student 1 would not consider IMFAs to be important in the ideal gas law.

   

• Student 2 would not consider IMFAs to be important in the ideal gas law.

• Student 2 would not consider molecule size to be important in the ideal gas law.

• The students do not disagree.

Multiple Choice

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?

• Higher IMFAs would lead to a volume lower than predicted by the ideal gas law and high molecule size would lead to greater volume than predicted by the ideal gas law.

• More information is necessary to make such a conclusion

• Higher IMFAs would lead to a volume greater than predicted by the ideal gas law and high molecule size would lead to greater volume than predicted by the ideal gas law.

• Higher IMFAs would lead to a volume greater than predicted by the ideal gas law and high molecule size would lead to lower volume than predicted by the ideal gas law.

Multiple Choice

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?

• Lock and Key, because, according to this model, the active site is static.

• Induced Fit, because, according to this model, the shape of the active site must change shape.

• Induced Fit, because, according to this model, the active site is static.

• Lock and Key, because, according to this model, the active site must change shape.

Multiple Choice

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?

 

• Lock and Key, because, according to this model, the active site is static.

• Lock and Key, because, according to this model, the active site must change shape.

• 
  Induced Fit, because, according to this model, the shape of the active site must change shape.

Multiple Choice

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?

 

• A loose fit

• Weak London dispersion forces

• 
  Strong ionic bonds

• Weak dipole-dipole interactions

Multiple Choice

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?

 

• Fargo

• Boston

• 
  Miami

• Chicago

Multiple Choice

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?

• Enzyme A

• Enzyme B

  
  

• 
  Both enzymes are appropriate to use

Multiple Choice

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?

• Enzyme A

• Enzyme B

  
  

• Both enzymes are equally efficient