Osmosis egg lab
Try an egg osmosis experiment: soak a shell-less egg in water and corn syrup, measure mass change, and explain the direction water moves.
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Gummy bear osmosis
Run a gummy bear osmosis experiment with water, salt water and vinegar; compare mass and size while accounting for gelatin’s limits as a cell model.
Elephant toothpaste
Yeast breaks down 3% hydrogen peroxide into a fast column of oxygen foam — test how the amount of yeast changes it.
Pendulum period
Change the string length, time ten swings, and graph T² against L to find the pattern behind a pendulum's rhythm.
Drops on a penny
Count how many drops of water a penny holds before the dome collapses, then test what soap does to that number.
Strawberry DNA
Mash strawberries with a soap-and-salt buffer, filter, then float DNA out of solution with cold rubbing alcohol.
Density column
Build a layered liquid density column, predict where objects will settle, and compare the observations with density measurements.
Egg drop challenge
Build a container that cushions a raw egg, then test it from rising heights to find where the padding stops working.
Paper helicopter lab
Cut paper helicopters with different rotor lengths, drop them from the same height, and time how long each one takes to land.
Skittles diffusion experiment
Arrange Skittles in a ring on a plate, add water at different temperatures, and time how fast the color spreads to the center.
Walking water experiment
Use paper towels to move colored water between cups, then investigate capillary action, timing, and how to make the test repeatable.
Mentos and soda geyser
Test how Mentos change a carbonated-soda geyser, measure the plume safely, and learn why the foam is not a new chemical reaction.
Red cabbage pH indicator lab
Boil red cabbage to make a natural pH indicator, then test household liquids to see which colors show up for acids and bases.
Potato osmosis lab
Soak identical potato strips in different salt concentrations overnight, then measure the length and mass change caused by osmosis.
Catalase enzyme lab
Drop hydrogen peroxide onto potato disks and time the bubbling to see how fast the enzyme catalase breaks it down.
Homemade lava lamp lab
Layer oil and colored water in a bottle, drop in effervescent tablets, and measure how long the bubbling lava effect lasts.
Magic milk experiment
Add food coloring to milk, touch the surface with a soap-dipped cotton swab, and compare how milk fat content changes the swirl.
Baking soda and vinegar reaction lab
React different amounts of baking soda with vinegar inside a bottle and measure how big the gas produced inflates a balloon.
Oobleck non-Newtonian fluid lab
Mix cornstarch and water at different ratios and measure how fast a marble sinks into each mixture to find where it stops acting like a liquid.
Salt water egg float lab
Dissolve different amounts of salt into water and lower an egg into each cup to find how much salt it takes to make the egg float.
Plant growth and light lab
Compare seedlings under different light conditions, record growth over time, and consider why height alone may not show plant health.
Celery and food coloring lab
Stand celery stalks in water at different temperatures and track how quickly the color travels up the stalk and into the leaves.
Yeast balloon experiment
Mix yeast, sugar and water at different temperatures inside a bottle and measure how much gas the yeast produces as it feeds.
Bouncing ball energy lab
Drop different types of balls from the same height and measure what percent of the drop height each one bounces back.
Paper towel absorbency lab
Compare paper towel absorbency by measuring how much water each brand holds before dripping; repeat trials with a consistent drain time and data table.
Sink or float lab
Predict and test whether everyday objects sink or float in water, then compare the results to each object's density.
Balloon rocket lab
Send inflated balloons racing along a string and measure how the amount of air inside changes how far each one travels.
Invisible ink lab
Write secret messages with different household liquids, let them dry invisible, then heat each one to see which reveals its message fastest.
Percent error
Learn how to calculate percent error with a worked density example, the correct formula, rounding guidance, and how to interpret a result above or below the accepted value.
Density
The density formula, a worked example with a graduated cylinder, and why density decides whether something floats.
Graduated cylinder
Why liquid curves in a cylinder, how to read the bottom of that curve correctly, and how far to estimate past the marked lines.
Triple beam balance
How a triple beam balance works, the order to slide the riders in, and how to add the three beam readings together.
Metric conversion
How the metric prefixes stack up, a step-by-step conversion example, and the shortcut for moving between them.
Significant figures
The rules for counting significant figures, why they matter for lab reports, and a worked example of rounding a calculated answer.
Lab safety
The core lab safety rules every student lab follows, what the standard hazard symbols mean, and what to do if something goes wrong.
Graphing data
How to set up a line or bar graph from lab data, choose a scale, and decide between a line graph and a bar graph.
Lab report format
The standard sections of a middle and high school lab report, what goes in each one, and the most common mistakes graders flag.
Meniscus
Why most lab liquids curve into a U shape against glass, why mercury curves the opposite way, and how that changes which edge you read.
Scientific notation
How to convert a lab measurement into scientific notation, worked both directions, and the two rules that keep it written correctly.
Microscope parts
Identify the parts of a compound light microscope, learn each function, calculate total magnification, and follow a safe low-power focusing sequence.
Common lab equipment
A reference table of common lab equipment, what each piece is actually used for, and the mistake students most often make with it.
Lab notebook
The habits that make a lab notebook a reliable record, and why rewriting your data neatly later actually defeats its purpose.
Data table
The order data tables should follow, where units belong, and a side-by-side look at a poorly built table versus a clear one.
The scientific method
The six-step loop scientists use to turn a question into evidence, and why real research rarely runs in a straight line.
Hypothesis
How to turn a question into a testable if-then-because prediction, with a worked example and what makes a hypothesis testable.
Independent vs dependent
How to tell the independent variable from the dependent variable in any experiment, with a worked example and common mix-ups.
Controlled variables
Why every fair test needs a list of controlled variables, and what goes wrong in an experiment when one gets left out.
Control vs experimental
Understand control vs experimental groups, choose an appropriate baseline, assign samples fairly, and see how group comparisons support or limit causal claims.
Qualitative vs quantitative
How to sort a lab observation into qualitative (described) or quantitative (measured), with side-by-side examples from real labs.
Observation vs inference
How to tell a direct observation from an inference (an educated guess based on that observation), with examples students mix up most.
Confounding variable
What a confounding variable is, how it's different from a controlled variable, and a worked example of one ruining a fair test.
Placebo effect
Why experiments involving people need a placebo group, and how that group helps separate a real effect from a psychological one.
Peer review
The steps a scientific study goes through before publication, and why peer review — while not perfect — raises the bar for credibility.
Correlation vs. causation
Why two variables moving together isn't proof one causes the other, with a classic example and how experiments get closer to real causation.
Hypothesis examples
Worked hypothesis examples from biology, chemistry, physics, and environmental science, all following the same testable format.
Experimental design
The decisions that make up a solid experimental design — variables, controls, trials, and bias — and the most common ways weak designs fail.
Theory vs. law
Why a theory doesn't 'graduate' into a law, what each one actually describes, and real examples of both from across science.
Graduated cylinder reader
Practice reading a graduated cylinder at eye level, with a new randomized cylinder each try.
Percent error calculator
Enter an experimental and accepted value to see the percent error formula worked out line by line.
Density calculator
Enter mass and volume, or use water displacement, to calculate density with the formula shown.
Triple beam balance reader
Practice reading a triple beam balance by sliding three riders on a randomized mass.
Metric conversion tool
Convert between common metric length, mass and volume units with the conversion shown step by step.
Significant figures counter
Type a number to see which digits are significant and why, following the standard counting rules.
Variable spotter
Read a short experiment scenario and identify the independent, dependent and controlled variables.
Hypothesis builder
Fill in the if-then-because template to build a testable hypothesis for your own experiment.
Graph paper maker
Generate and print graph paper with the grid size, line weight and paper size you choose.
Lab report builder
Fill in each section of a lab report on screen, then print a clean copy with all your answers.
Can you spot a fair test?
Identify variables, controls and evidence in a simple investigation.
Read the osmosis evidence
Use mass change to infer net water movement—and avoid overclaiming the model.
Catalysts, gas and foam
Explain what yeast, oxygen and soap each contribute to elephant toothpaste.
Catalyst
A substance that increases a reaction rate without being consumed as a reactant. Enzymes such as catalase are biological catalysts.
Claim–Evidence–Reasoning (CER)
A way to explain a result: state a claim, point to relevant evidence, and explain why that evidence supports the claim.
Confounding variable
A factor that changes alongside the tested variable and could offer another explanation for the measured result.
Control group
A comparison condition that does not receive the treatment being studied, or receives the standard condition, helping interpret the treatment result.
Dependent variable
The outcome a researcher measures or observes in response to a planned change.
Diffusion
Net movement of particles from a region of higher concentration toward a region of lower concentration, caused by random motion.
Evidence
Observations or measurements used to evaluate a claim. Evidence is stronger when methods, units, conditions and uncertainty are clear.
Hypothesis
A testable, reasoned prediction about a relationship between variables. A result can support or fail to support it; a hypothesis is not proven by one trial.
Independent variable
The factor deliberately changed in an investigation. A fair test usually changes one planned factor at a time.
Inference
An interpretation drawn from observations and prior knowledge. It should be distinguished from what was directly observed.
Osmosis
Net movement of water across a selectively permeable membrane driven by differences in water potential or solute concentration. Water molecules still move in both directions.
Peer review
Evaluation of a research report by other knowledgeable researchers before publication. It can identify weaknesses but does not guarantee that a finding is correct.
Percent change
The change relative to the starting value, expressed as a percentage: (final − start) ÷ start × 100.
Replication
Repeating measurements or an investigation with additional samples or trials to assess variability and whether a pattern recurs.
Selectively permeable membrane
A barrier that allows some substances to cross more readily than others. Real cell membranes have complex transport processes.
Uncertainty
The range of doubt associated with a measurement or estimate. Repeated trials, calibrated equipment and clear precision help describe it.