Digital ACT Practice Questions

If 100.0 g of liquid water at 100.0°C were mixed with 100.0 g of liquid water at 20.0°C in the same calorimeter, the final temperature would be closest to: Expe...

Based on Table 25, which wavelength is absorbed most strongly by Chlorophyll b? Experiment Context (Spectrophotometric Absorption of Photosynthetic Pigments): B...

Both chlorophyll a and chlorophyll b exhibit their lowest absorption at 550 nm. This explains why: Experiment Context (Spectrophotometric Absorption of Photosyn...

Having two distinct pigments (chlorophyll a and b) with differing peak absorption wavelengths provides an evolutionary advantage because it: Experiment Context ...

Based on Table 26, which star is classified as a Red Supergiant? Experiment Context (Hertzsprung-Russell Stellar Data): Astrophysicists surveyed four representa...

How can Star 4 (Sirius B) possess an extremely hot surface temperature of 25,000 K while radiating a luminosity of only 0.003 L_sun? Experiment Context (Hertzsp...

Based on standard spectral classification (O, B, A, F, G, K, M from hottest to coolest), the correct ordering of these stars from highest to lowest surface temp...

Based on Table 27, as water temperature increases from 10°C to 80°C, the dissolution of PbCl2(s) is: Experiment Context (Thermal Solubility of Lead(II) Chloride...

The solubility product expression for the dissolution PbCl2(s) Pb2+(aq) + 2 Cl-(aq) is: Experiment Context (Thermal Solubility of Lead(II) Chloride): Chemistry ...

If 0.10 M NaCl is added to a saturated solution of PbCl2 at 20°C, what will happen? Experiment Context (Thermal Solubility of Lead(II) Chloride): Chemistry stud...

Based on Table 28, the phenotypic ratio observed in the F2 generation closely approximates: Experiment Context (Dihybrid Inheritance in Pisum sativum): Genetici...

What fraction of the F2 seeds display the double-recessive phenotype (green and wrinkled)? Experiment Context (Dihybrid Inheritance in Pisum sativum): Geneticis...

The 9:3:3:1 ratio demonstrates Mendel's Law of Independent Assortment, which holds true because: Experiment Context (Dihybrid Inheritance in Pisum sativum): Gen...

Based on Table 29, the induced electromotive force (EMF) is: Experiment Context (Electromagnetic Induction in a Wire Coil): Students moved a bar magnet into a 5...

Why is the induced EMF exactly 0.00 V when the magnet sits motionless inside the coil? Experiment Context (Electromagnetic Induction in a Wire Coil): Students m...

According to Lenz's Law, the direction of the induced current in the coil will always: Experiment Context (Electromagnetic Induction in a Wire Coil): Students m...

Based on Table 30, across which depth interval is the steepest drop in seawater temperature (the thermocline) observed? Experiment Context (Subtropical Oceanic ...

Seawater density increases continuously from 1,024.2 kg/m^3 at the surface to 1,027.9 kg/m^3 at 2,000 m primarily because: Experiment Context (Subtropical Ocean...

Why does the surface mixed layer (0 to 100 m) maintain a nearly uniform temperature (24.5°C to 23.8°C)? Experiment Context (Subtropical Oceanic Depth Profiles):...

Based on Table 31, the relationship between capillary tube internal diameter and the equilibrium rise height of water is: Experiment Context (Capillary Rise of ...

Capillary rise occurs in glass tubes because: Experiment Context (Capillary Rise of Water in Glass Tubes): Physics students immersed clean vertical borosilicate...

If liquid mercury (which has cohesive forces far stronger than adhesive forces to glass) were used instead of water: Experiment Context (Capillary Rise of Water...

Comparing Experiment 1 and Experiment 2, doubling [A] while holding [B] constant causes the initial rate to: Experiment Context (Reaction Orders of Reaction 2A ...

Comparing Experiment 1 and Experiment 3, doubling [B] while holding [A] constant causes the rate to: Experiment Context (Reaction Orders of Reaction 2A + B -> C...