Yes. The free plan includes 5 practice tests per course. Full access is $19.99/mo per course.

What exams does Cognify cover?

Cognify covers AP Psychology, Digital SAT, AP Biology, and AP Statistics with practice tests, rubric-graded FRQs, and score prediction.

How does Cognify compare to Khan Academy?

Cognify focuses on exam-format practice with AI grading and score prediction. Khan Academy provides broad video instruction. Cognify is purpose-built for AP and SAT exam day performance.

How does Cognify compare to UWorld and Princeton Review?

UWorld and Princeton Review rely on static question banks that students exhaust after a few sessions. Cognify generates fresh questions on demand against the official College Board exam blueprint, so every practice test is unique. FRQs are graded point-by-point against AP rubrics with specific feedback on what you earned and missed.

How accurate is the AP score prediction?

Cognify maps your percentage correct to the public AP composite scoring buckets (1-5) using historical score distributions. The prediction improves as you take more practice tests. For the Digital SAT, scores map to the 400-1600 scale using official section score conversion tables.

Does Cognify cover AP FRQ practice?

Yes. Cognify provides rubric-graded FRQ practice for AP Psychology, AP Biology, and AP Statistics. Each response is scored criterion by criterion against the official AP rubric with specific written feedback explaining what you earned, what you missed, and how to improve.

Properties of Water

AP Biology — Chemistry of Life

Overview

Water's unique properties: polarity, hydrogen bonding, cohesion, adhesion, surface tension, high specific heat, solvent properties, and density anomaly.

Key Terms

polarity
hydrogen bond
cohesion
adhesion
specific heat
surface tension

Exam Tips

Connect water properties to biological functions
Know how hydrogen bonds explain each property

Common Mistakes to Avoid

Forgetting that ice floats because of hydrogen bond geometry
Not connecting cohesion to water transport in plants

Frequently Asked Questions

Why is water essential for life?

Water acts as a universal solvent, moderates temperature through high specific heat, enables transport in organisms through cohesion/adhesion, and supports many biochemical reactions.

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AI-generated questions with instant feedback. Free to start.

Start Practicing Free

Properties of Water

AP Biology — Chemistry of Life

Overview

Water's unique properties: polarity, hydrogen bonding, cohesion, adhesion, surface tension, high specific heat, solvent properties, and density anomaly.

Key Terms

polarity
hydrogen bond
cohesion
adhesion
specific heat
surface tension

Exam Tips

Connect water properties to biological functions
Know how hydrogen bonds explain each property

Common Mistakes to Avoid

Forgetting that ice floats because of hydrogen bond geometry
Not connecting cohesion to water transport in plants

Frequently Asked Questions

Why is water essential for life?

Water acts as a universal solvent, moderates temperature through high specific heat, enables transport in organisms through cohesion/adhesion, and supports many biochemical reactions.

Ready to practice Properties of Water?

AI-generated questions with instant feedback. Free to start.

Start Practicing Free

Properties of Water

Overview

Key Terms

Exam Tips

Common Mistakes to Avoid

Frequently Asked Questions

Ready to practice Properties of Water?

Related Chemistry of Life Topics

Properties of Water

Overview

Key Terms

Exam Tips

Common Mistakes to Avoid

Frequently Asked Questions

Ready to practice Properties of Water?

Related Chemistry of Life Topics