act conflicting-viewpoints concepts

ACT Conflicting viewpoints Practice Questions

Conflicting viewpoints questions show up frequently in the Science section of the ACT. Below are practice questions taken from our bank to help you prepare.

Starter questions

Question 1

A study examined the effect of varying light intensity on the rate of photosynthesis in spinach leaves. The experiment measured oxygen production mL/hmL/h as an indicator of photosynthetic activity under different light conditions, expressed in lux. Data were collected at 25°C with constant carbon dioxide levels.

A study examined the effect of varying light intensity on the rate of photosynthesis in spinach leaves. The experiment measured oxygen production mL/hmL/h as an indicator of photosynthetic activity under different light conditions, expressed in lux. Data were collected at 25°C with constant carbon dioxide levels.

Light Intensity (lux)Oxygen Production mL/hmL/hStomatal Conductance (mmol/m²s)
1,0002.3150
3,0004.7230
5,0006.1290
7,0006.4310
9,0006.5320
Question 2

A study was conducted to examine the effect of different light wavelengths on the growth rate of Arabidopsis thaliana, a model plant species in biology. Seedlings were exposed to varying light conditions for 14 days, and their average height increase was measured. The light wavelengths tested ranged from blue to far-red regions of the spectrum.

A study was conducted to examine the effect of different light wavelengths on the growth rate of Arabidopsis thaliana, a model plant species in biology. Seedlings were exposed to varying light conditions for 14 days, and their average height increase was measured. The light wavelengths tested ranged from blue to far-red regions of the spectrum.

Wavelength nmnmLight ColorAvg. Height Increase cmcmLeaf Area (cm²)
450Blue3.28.1
550Green2.77.3
650Red4.510.2
730Far-Red5.111.4

More questions

Question 3

The topic of chemical bonding and molecular structure has long been a subject of debate among chemists, particularly regarding the behavior of certain molecules under specific conditions. One such molecule, water (H2O), exhibits unique properties that have led to conflicting explanations among researchers. This passage presents three alternative viewpoints on why water molecules form hydrogen bonds more readily than other similar molecules. Each viewpoint is attributed to a named student or researcher and offers a distinct explanation. Viewpoint 1: Dr. Elena Martinez, a chemist specializing in molecular interactions, argues that the polarity of water molecules is the primary factor driving hydrogen bond formation. According to Dr. Martinez, the uneven distribution of electrons in the water molecule creates a strong dipole moment, with the oxygen atom carrying a partial negative charge and the hydrogen atoms carrying partial positive charges. This polarity allows water molecules to attract each other strongly, forming hydrogen bonds. Dr. Martinez emphasizes that the high electronegativity of oxygen compared to hydrogen is the key reason for this behavior, making water unique among molecules of similar size and structure. Viewpoint 2: In contrast, Dr. Raj Patel, a researcher in quantum chemistry, proposes that the geometry of water molecules plays a more significant role in hydrogen bond formation. Dr. Patel argues that the bent shape of the water molecule, with a bond angle of approximately 104.5 degrees, maximizes the electrostatic interactions between molecules. This geometry allows the lone pairs of electrons on the oxygen atom to align optimally with the hydrogen atoms of neighboring molecules, facilitating hydrogen bonding. Dr. Patel contends that molecules with different geometries, even if they are polar, do not experience the same degree of hydrogen bonding because their electron distributions are less favorable for such interactions. Viewpoint 3: Finally, Sarah Johnson, a graduate student studying thermodynamics, offers a different perspective. Sarah suggests that hydrogen bonding in water is primarily driven by entropy rather than polarity or geometry. She explains that when water molecules form hydrogen bonds, they create a more ordered structure, which is thermodynamically favorable at lower temperatures. Sarah argues that this entropy-driven process is the reason water exhibits such strong hydrogen bonding compared to other molecules. She points out that other polar molecules do not form hydrogen bonds as readily because their entropy changes are less favorable under similar conditions. Each of these viewpoints provides a plausible explanation for the phenomenon of hydrogen bonding in water, yet they are mutually inconsistent. Dr. Martinez focuses on polarity, Dr. Patel on geometry, and Sarah Johnson on thermodynamics. The debate continues as researchers seek to reconcile these perspectives and uncover the underlying principles governing molecular behavior.

Question 4

The topic of chemical bonding and molecular structure has long been a subject of debate among chemists, particularly regarding the behavior of certain molecules under specific conditions. One such molecule, water (H2O), exhibits unique properties that have led to conflicting explanations among researchers. This passage presents three alternative viewpoints on why water molecules form hydrogen bonds more readily than other similar molecules. Each viewpoint is attributed to a named student or researcher and offers a distinct explanation. Viewpoint 1: Dr. Elena Martinez, a chemist specializing in molecular interactions, argues that the polarity of water molecules is the primary factor driving hydrogen bond formation. According to Dr. Martinez, the uneven distribution of electrons in the water molecule creates a strong dipole moment, with the oxygen atom carrying a partial negative charge and the hydrogen atoms carrying partial positive charges. This polarity allows water molecules to attract each other strongly, forming hydrogen bonds. Dr. Martinez emphasizes that the high electronegativity of oxygen compared to hydrogen is the key reason for this behavior, making water unique among molecules of similar size and structure. Viewpoint 2: In contrast, Dr. Raj Patel, a researcher in quantum chemistry, proposes that the geometry of water molecules plays a more significant role in hydrogen bond formation. Dr. Patel argues that the bent shape of the water molecule, with a bond angle of approximately 104.5 degrees, maximizes the electrostatic interactions between molecules. This geometry allows the lone pairs of electrons on the oxygen atom to align optimally with the hydrogen atoms of neighboring molecules, facilitating hydrogen bonding. Dr. Patel contends that molecules with different geometries, even if they are polar, do not experience the same degree of hydrogen bonding because their electron distributions are less favorable for such interactions. Viewpoint 3: Finally, Sarah Johnson, a graduate student studying thermodynamics, offers a different perspective. Sarah suggests that hydrogen bonding in water is primarily driven by entropy rather than polarity or geometry. She explains that when water molecules form hydrogen bonds, they create a more ordered structure, which is thermodynamically favorable at lower temperatures. Sarah argues that this entropy-driven process is the reason water exhibits such strong hydrogen bonding compared to other molecules. She points out that other polar molecules do not form hydrogen bonds as readily because their entropy changes are less favorable under similar conditions. Each of these viewpoints provides a plausible explanation for the phenomenon of hydrogen bonding in water, yet they are mutually inconsistent. Dr. Martinez focuses on polarity, Dr. Patel on geometry, and Sarah Johnson on thermodynamics. The debate continues as researchers seek to reconcile these perspectives and uncover the underlying principles governing molecular behavior.

Question 5

The topic of chemical bonding and molecular structure has long been a subject of debate among chemists, particularly regarding the behavior of certain molecules under specific conditions. One such molecule, water (H2O), exhibits unique properties that have led to conflicting explanations among researchers. This passage presents three alternative viewpoints on why water molecules form hydrogen bonds more readily than other similar molecules. Each viewpoint is attributed to a named student or researcher and offers a distinct explanation. Viewpoint 1: Dr. Elena Martinez, a chemist specializing in molecular interactions, argues that the polarity of water molecules is the primary factor driving hydrogen bond formation. According to Dr. Martinez, the uneven distribution of electrons in the water molecule creates a strong dipole moment, with the oxygen atom carrying a partial negative charge and the hydrogen atoms carrying partial positive charges. This polarity allows water molecules to attract each other strongly, forming hydrogen bonds. Dr. Martinez emphasizes that the high electronegativity of oxygen compared to hydrogen is the key reason for this behavior, making water unique among molecules of similar size and structure. Viewpoint 2: In contrast, Dr. Raj Patel, a researcher in quantum chemistry, proposes that the geometry of water molecules plays a more significant role in hydrogen bond formation. Dr. Patel argues that the bent shape of the water molecule, with a bond angle of approximately 104.5 degrees, maximizes the electrostatic interactions between molecules. This geometry allows the lone pairs of electrons on the oxygen atom to align optimally with the hydrogen atoms of neighboring molecules, facilitating hydrogen bonding. Dr. Patel contends that molecules with different geometries, even if they are polar, do not experience the same degree of hydrogen bonding because their electron distributions are less favorable for such interactions. Viewpoint 3: Finally, Sarah Johnson, a graduate student studying thermodynamics, offers a different perspective. Sarah suggests that hydrogen bonding in water is primarily driven by entropy rather than polarity or geometry. She explains that when water molecules form hydrogen bonds, they create a more ordered structure, which is thermodynamically favorable at lower temperatures. Sarah argues that this entropy-driven process is the reason water exhibits such strong hydrogen bonding compared to other molecules. She points out that other polar molecules do not form hydrogen bonds as readily because their entropy changes are less favorable under similar conditions. Each of these viewpoints provides a plausible explanation for the phenomenon of hydrogen bonding in water, yet they are mutually inconsistent. Dr. Martinez focuses on polarity, Dr. Patel on geometry, and Sarah Johnson on thermodynamics. The debate continues as researchers seek to reconcile these perspectives and uncover the underlying principles governing molecular behavior.

Question 6

A study investigated the relationship between the angle of an inclined plane and the acceleration of a sliding object. Researchers used a 1 kg block and measured its acceleration down ramps set at varying angles. The experiments were conducted in a controlled environment to minimize friction and air resistance effects. Data was collected using motion sensors to track the block's position over time.

A study investigated the relationship between the angle of an inclined plane and the acceleration of a sliding object. Researchers used a 1 kg block and measured its acceleration down ramps set at varying angles. The experiments were conducted in a controlled environment to minimize friction and air resistance effects. Data was collected using motion sensors to track the block's position over time.

Incline Angle (degrees)Theoretical Acceleration m/s2m/s²Measured Acceleration m/s2m/s²
50.850.82
101.71.65
152.542.45
203.353.2
254.143.95

Hard questions

Question 7

Researchers investigated the effect of different light wavelengths on the growth rate of Arabidopsis thaliana plants. Two experiments were conducted: one measured plant height over time under red, blue, and green light, while the other examined chlorophyll content in leaves exposed to the same light conditions. The results provide insights into how light quality influences plant development.

Researchers investigated the effect of different light wavelengths on the growth rate of Arabidopsis thaliana plants. Two experiments were conducted: one measured plant height over time under red, blue, and green light, while the other examined chlorophyll content in leaves exposed to the same light conditions. The results provide insights into how light quality influences plant development.

Light Wavelength nmnmAverage Plant Height cmcmChlorophyll Content mg/gmg/g
45012.31.8
5309.71.2
66015.62.4
73014.12.1
Question 8

Researchers investigated the effect of different light wavelengths on the growth rate of Arabidopsis thaliana, a model plant organism. Two experiments were conducted using controlled LED light sources emitting specific wavelengths (blue, red, and green) while keeping other growth factors constant. Plant height and leaf area were measured weekly over a 28-day period.

Researchers investigated the effect of different light wavelengths on the growth rate of Arabidopsis thaliana, a model plant organism. Two experiments were conducted using controlled LED light sources emitting specific wavelengths (blue, red, and green) while keeping other growth factors constant. Plant height and leaf area were measured weekly over a 28-day period.

Light wavelength nmnmAverage height cmcm at 28 daysAverage leaf area (cm²) at 28 daysChlorophyll content mg/gmg/g
45012.38.72.1
5209.86.21.4
65015.611.32.8
70014.29.82.5
Question 9

Researchers investigated the effect of temperature on the growth rate of E. coli bacteria. Two experiments were conducted: one to measure bacterial colony size at different temperatures, and another to assess the rate of bacterial division over time. The goal was to determine the optimal temperature for E. coli growth.

Researchers investigated the effect of temperature on the growth rate of E. coli bacteria. Two experiments were conducted: one to measure bacterial colony size at different temperatures, and another to assess the rate of bacterial division over time. The goal was to determine the optimal temperature for E. coli growth.

Temperature (°C)Colony Size mmmmDivision Rate (per hour)
202.10.3
304.50.8
376.21.2
405.81
4530.4
Read the full strategy guideStrategies for Conflicting viewpoints

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