Digital ACT Practice Questions

Calcium carbonate reacted with 1.0 M HCl to produce CO2: - Form 1 (Solid marble chip, 5.0 g): Reaction completed in 320 s - Form 2 (Coarse granules, 5.0 g): Rea...

Water rose in glass capillary tubes of different internal radii: - Radius = 0.2 mm: Height = 74 mm - Radius = 0.4 mm: Height = 37 mm - Radius = 0.8 mm: Height =...

A PCR assay amplified a 500 bp target gene from 1 initial copy: - Cycle 10: ~1,000 copies - Cycle 20: ~1,000,000 copies - Cycle 30: ~1,000,000,000 copies This e...

Two carts collided on a frictionless air track: - Cart A (1.0 kg, 3.0 m/s) collides with stationary Cart B (2.0 kg, 0 m/s) and they stick together. - Combined f...

Vapor pressure of three liquids was measured at 20°C: - Water: 2.3 kPa - Ethanol: 5.8 kPa - Diethyl ether: 58.6 kPa Which liquid has the weakest intermolecular ...

A patient's blood was tested with Anti-A and Anti-B diagnostic antibodies: - Anti-A added: Strong agglutination (clumping) - Anti-B added: No agglutination What...

A Daniell galvanic cell Zn(s) | Zn^2+(aq) || Cu^2+(aq) | Cu(s) had cell voltage measured: - [Cu^2+] = 1.0 M, [Zn^2+] = 1.0 M: Voltage = 1.10 V - [Cu^2+] = 1.0 M...

A paleoclimatology study compared Earth's orbital parameters with Pleistocene ice volume: - Orbital eccentricity oscillates on a ~100,000-year period. - Axial o...

Water flows through a horizontal pipe that constricts from radius 5 cm to 2 cm: - In wide section (5 cm): Velocity = 1.0 m/s, Pressure = 150 kPa - In narrow con...

Oat coleoptiles were exposed to unidirectional light: - Tip intact: Bends toward light (42° curvature) - Tip removed: No bending (0°) - Tip covered with opaque ...

A 1.0 kg mass oscillates on a vertical spring (k = 100 N/m): - At top of swing (maximum displacement): Kinetic energy = 0 J, Potential energy = 2.0 J - At equil...

Hoffman apparatus electrolysis of acidified water (2 H2O -> 2 H2 + O2) produced gases at cathode and anode: - Cathode: Gas A volume = 40.0 mL - Anode: Gas B vol...

An object was placed at various distances d_o in front of a concave mirror (focal length f = 20 cm): - d_o = 60 cm: Image distance d_i = 30 cm, Real, Inverted -...

Biochemists measured DNA melting temperature (Tm) for synthetic oligonucleotides: - Oligo 1 (20% GC, 80% AT): Tm = 68.2°C - Oligo 2 (40% GC, 60% AT): Tm = 76.5°...

A uniform lever balanced horizontally on a central fulcrum: - Left side: Mass m1 = 4.0 kg at distance d1 = 1.5 m (Torque = 4.0 * 1.5 = 6.0 kg*m) - Right side: M...

Precipitation of lead(II) iodide: Pb(NO3)2 + 2 KI -> PbI2(s) + 2 KNO3. - Flask 1: 0.10 mol Pb(NO3)2 + 0.10 mol KI -> 0.05 mol PbI2 formed - Flask 2: 0.10 mol Pb...

Global climate simulations modeled atmospheric cyclone rotation: - Northern Hemisphere low-pressure systems rotate COUNTERCLOCKWISE. - Southern Hemisphere low-p...

A monochromatic green laser (532 nm) illuminated two slits separated by distance d: - Slit separation d = 0.25 mm: Fringe spacing delta y = 4.2 mm - Slit separa...

The primary conflict in the passage centers on Elias's: Passage Excerpt (Literary Narrative): Master horologist Elias Vance worked not by the chime of the cathe...

As it is used in the passage, the phrase 'idiosyncratic heartbeat' most nearly emphasizes that mechanical watches: Passage Excerpt (Literary Narrative): Master ...

It can reasonably be inferred from the passage that Elias values mechanical watches primarily because they: Passage Excerpt (Literary Narrative): Master horolog...

The author's tone when describing the quartz clock ('unfeeling, quartz-locked precision') can best be described as: Passage Excerpt (Literary Narrative): Master...

According to the passage, what was a primary economic advantage of maritime trade over overland caravan routes? Passage Excerpt (Social Science): While 19th-cen...

The author's attitude toward 19th-century historians who focused primarily on overland routes can best be described as: Passage Excerpt (Social Science): While ...