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Questions
A 0.10 M solution of a weak acid HA has a pH of 3.00 at 25°C. What is the acid dissociation constant, Ka, for HA?
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A 0.20 kg ball is at rest when a force is applied, accelerating it to 10 m/s in 0.050 s. What is the magnitude of the impulse delivered to the ball?
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A 0.50 kg ball traveling at 8.0 m/s to the right strikes a wall and bounces back at 6.0 m/s to the left. The ball is in contact with the wall for 0.020 s. What is the magnitude of the average force exerted by the wall on the ball?
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A 10 kg box sits on a horizontal surface with a coefficient of static friction μ_s = 0.40 and a coefficient of kinetic friction μ_k = 0.30. A horizontal force is gradually increased from zero. What is the minimum applied force needed to start the box moving,...
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A 2.0 kg ball is released from rest at a height of 5.0 m above the ground on a frictionless track. At the bottom of the track (ground level), the ball enters a rough horizontal section with a coefficient of kinetic friction μ_k = 0.50. How far along the rough...
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A 4.0 kg block slides across a rough horizontal surface. Its speed decreases from 6.0 m/s to 2.0 m/s over a distance of 4.0 m. What is the magnitude of the friction force acting on the block?
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A 5.0 kg block rests on a frictionless horizontal surface. Two horizontal forces act on the block: a 20 N force to the right and a 12 N force to the left. What is the magnitude and direction of the block's acceleration?
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A ball is launched horizontally from the edge of a table that is 1.25 m above the floor with an initial speed of 3.0 m/s. Assuming no air resistance and g = 10 m/s^2, how far from the base of the table does the ball land?
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A block of mass m oscillates on a horizontal frictionless surface attached to a spring with spring constant k. If the mass is doubled to 2m while the spring constant remains the same, how does the period of oscillation change?
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A car starts from rest and accelerates uniformly at 2 m/s^2 for 10 s. It then travels at constant velocity for another 10 s. What is the total distance traveled by the car during the entire 20 s?
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A car travels 240 miles using 8 gallons of fuel. At this same rate, how many gallons of fuel would be needed to travel 420 miles?
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A recipe calls for flour and sugar in a ratio of 5 to 2. If a baker uses 3.5 cups of sugar, how many cups of flour are needed?
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A right circular cone has a radius of 3 inches and a height of 8 inches. What is the volume, in cubic inches, of the cone?
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A right circular cylinder has a radius of 4 cm and a height of 9 cm. A second right circular cylinder has a radius of 6 cm and the same volume as the first cylinder. What is the height, in cm, of the second cylinder?
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A sealed, rigid container holds 2.00 mol of an ideal gas at 300 K and 1.00 atm. If the temperature is increased to 450 K, what is the new pressure in the container?
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A swimming pool is filled with water (ρ = 1000 kg/m^3). What is the gauge pressure at a depth of 3.0 m below the surface? Use g = 10 m/s^2.
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A thin hoop and a solid disk have the same mass M and the same radius R. Both start from rest at the top of an inclined plane and roll without slipping to the bottom. Which object reaches the bottom first, and why?
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A wheel starts from rest and accelerates uniformly at 4.0 rad/s^2 for 5.0 s. How many complete revolutions does the wheel make during this time?
Questions
According to VSEPR theory, what is the molecular geometry of XeF₂?
Topics
46 practice questions tagged Acids and Bases on the AP Chemistry exam, with what the topic covers and a worked sample.
Subjects
Passage interpretation and research summaries.
Guides
How to pace ACT Science: read the data first, order the passages, handle conflicting viewpoints, and never run out of time.
Topics
127 practice questions tagged Advanced Math on the SAT Math exam, with what the topic covers and a worked sample.
Topics
117 practice questions tagged Algebra on the SAT Math exam, with what the topic covers and a worked sample.
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An atom of an element has 20 protons, 20 neutrons, and 18 electrons. Which of the following correctly identifies this species?
Subjects
MCQ and exam-style chemistry review.
Guides
Equilibrium for AP Chemistry: writing K expressions, comparing Q to K, applying Le Chatelier, and using Ka, Kb, and Kw with a worked ICE table.
Guides
AP Chemistry exam strategy: reasoning from particle models, earning free-response partial credit, using the equations sheet, and pacing.
Subjects
Unit practice, MCQ, and FRQ review.
Guides
Draw free-body diagrams that actually solve problems: what belongs on them, a repeatable procedure, and worked incline and elevator examples.
Guides
How to study for AP Physics 1: build concepts, master free-body diagrams and energy, and write the reasoning the exam rewards.
Questions
Practice record from the ScoreMint question bank.
Questions
Practice record from the ScoreMint question bank.
Topics
43 practice questions tagged Applications of Thermodynamics on the AP Chemistry exam, with what the topic covers and a worked sample.
Topics
35 practice questions tagged Atomic Structure and Properties on the AP Chemistry exam, with what the topic covers and a worked sample.
Guides
Build an SAT study schedule you'll follow: work backward from test day, balance practice and review, and keep sessions short.
Topics
31 practice questions tagged Chemical Reactions on the AP Chemistry exam, with what the topic covers and a worked sample.
Topics
22 practice questions tagged Conflicting Viewpoints on the ACT Science exam, with what the topic covers and a worked sample.
Questions
Consider the balanced equation: 2 Al(s) + 3 Cl₂(g) → 2 AlCl₃(s) If 5.4 g of Al (molar mass 27.0 g/mol) reacts with excess Cl₂, what mass of AlCl₃ (molar mass 133.5 g/mol) is produced?
Topics
43 practice questions tagged Data Representation on the ACT Science exam, with what the topic covers and a worked sample.
Guides
How the digital SAT differs from the old paper test: the section-adaptive format, on-screen tools, the calculator, and how to prepare for it.
Questions
Approximately 66 million years ago, at the boundary between the Cretaceous and Paleogene periods (the K-Pg boundary), roughly 75% of all species on Earth, including all non-avian dinosaurs, went extinct. Scientists have proposed different explanations for thi...
Questions
Catalase is an enzyme found in nearly all living organisms. It catalyzes the decomposition of hydrogen peroxide (H₂O₂) into water (H₂O) and oxygen gas (O₂). A group of students investigated how temperature affects the rate of catalase activity. The students...
Topics
47 practice questions tagged Energy and Momentum of Rotating Systems on the AP Physics 1 exam, with what the topic covers and a worked sample.
Topics
44 practice questions tagged Equilibrium on the AP Chemistry exam, with what the topic covers and a worked sample.
Questions
Students investigated the factors that affect the period of a simple pendulum. The period (T) is the time for one complete back-and-forth swing. They constructed simple pendulums by attaching a small, dense metal bob to a lightweight string, which was clamped...
Topics
43 practice questions tagged Fluids on the AP Physics 1 exam, with what the topic covers and a worked sample.
Questions
For the reaction A + B → C, the following initial rate data were collected: Experiment 1: [A] = 0.10 M, [B] = 0.10 M, Rate = 2.0 × 10⁻³ M/s Experiment 2: [A] = 0.20 M, [B] = 0.10 M, Rate = 8.0 × 10⁻³ M/s Experiment 3: [A] = 0.10 M, [B] = 0.20 M, Rate = 4....
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For the reaction N₂(g) + 3 H₂(g) ⇌ 2 NH₃(g), the equilibrium constant Kc = 0.50 at a certain temperature. If the equilibrium concentrations are [N₂] = 1.0 M and [H₂] = 2.0 M, what is [NH₃] at equilibrium?
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For which of the following reactions is ΔS° expected to be the most positive (greatest increase in entropy)?
Topics
48 practice questions tagged Force and Translational Dynamics on the AP Physics 1 exam, with what the topic covers and a worked sample.
Topics
53 practice questions tagged Geometry and Trigonometry on the SAT Math exam, with what the topic covers and a worked sample.
Questions
Given the following standard enthalpies of formation: ΔH°f [CO₂(g)] = -393.5 kJ/mol ΔH°f [H₂O(l)] = -285.8 kJ/mol ΔH°f [C₂H₆(g)] = -84.7 kJ/mol ΔH°f [O₂(g)] = 0 kJ/mol What is ΔH°rxn for the reaction as written? 2 C₂H₆(g) + 7 O₂(g) → 4 CO₂(g) + 6 H₂O(...
Guides
A diagnostic-driven plan to raise your SAT score: baseline, target weak skills, review every miss, and simulate the full test.
Guides
A method for ACT Science figures: orient to axes and units, name the trend, track what changed between experiments, and cross-reference two figures.
Guides
How to write AP free-response answers that score: command verbs, showing work for partial credit, and self-scoring against the rubric.
Questions
If 5(x - 2) + 3 = 2x + 5, what is the value of x?
Questions
If 7 - 2(3x + 1) = 4x - 5, what is the value of x?
Topics
54 practice questions tagged Intermolecular Forces and Properties on the AP Chemistry exam, with what the topic covers and a worked sample.
Topics
44 practice questions tagged Kinematics on the AP Physics 1 exam, with what the topic covers and a worked sample.
Topics
32 practice questions tagged Kinetics on the AP Chemistry exam, with what the topic covers and a worked sample.
Topics
41 practice questions tagged Linear Momentum on the AP Physics 1 exam, with what the topic covers and a worked sample.
Topics
34 practice questions tagged Molecular and Ionic Compound Structure and Properties on the AP Chemistry exam, with what the topic covers and a worked sample.
Questions
On a map, 1 inch represents 25 miles. If two cities are 7.5 inches apart on the map, what is the actual distance, in miles, between the two cities?
Topics
44 practice questions tagged Oscillations on the AP Physics 1 exam, with what the topic covers and a worked sample.
Topics
53 practice questions tagged Problem-Solving and Data Analysis on the SAT Math exam, with what the topic covers and a worked sample.
Topics
55 practice questions tagged Research Summaries on the ACT Science exam, with what the topic covers and a worked sample.
Subjects
Algebra, functions, geometry, and data analysis.
Guides
SAT Math strategy that works: pacing, plugging in numbers, avoiding trap answers, and building accuracy with focused, well-reviewed practice.
Guides
Why spaced repetition beats cramming for the SAT and AP: the forgetting curve, the spacing effect, active recall, and how to run it in your prep.
Questions
The function f is defined by f(x) = |x - 3| + 2. What is the minimum value of f(x)?
Questions
The length of a rectangle is 3 more than twice its width. If the perimeter of the rectangle is 36, what is the area of the rectangle?
Guides
The avoidable SAT Math errors that cost points: answering the wrong question, sign slips, misreading graphs, and leaving blanks.
Topics
31 practice questions tagged Thermodynamics on the AP Chemistry exam, with what the topic covers and a worked sample.
Topics
39 practice questions tagged Torque and Rotational Dynamics on the AP Physics 1 exam, with what the topic covers and a worked sample.
Guides
How to use the digital SAT's built-in Desmos graphing calculator: solve by graphing, find intersections, use sliders, and know when to skip it.
Questions
What is the product of all values of x that satisfy |3x + 1| = 10?
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What is the sum of all values of x that satisfy the equation |2x - 5| = 7?
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What value of x satisfies the equation (3x + 1)/4 = (x + 3)/2?
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When aqueous solutions of silver nitrate (AgNO₃) and sodium chloride (NaCl) are mixed, a white precipitate forms. What is the net ionic equation for this reaction?
Questions
Which of the following compounds is expected to have the highest melting point?
Questions
Which of the following represents the ground-state electron configuration of a neutral chromium (Cr, Z = 24) atom?
Topics
44 practice questions tagged Work, Energy, and Power on the AP Physics 1 exam, with what the topic covers and a worked sample.
