💙 EPI Exam Prep

What is a hypothesis?

A prediction based on science.

Good hypothesis formula?

If (IV), then (DV), because...

Independent variable?

The variable you change.

Dependent variable?

The variable you measure.

Controlled variables?

Variables kept the same.

Why control variables?

To make it a fair test.

Filtration?

Separates an insoluble solid from a liquid.

Evaporation?

Separates a dissolved solid from a liquid.

Distillation?

Separates liquids by boiling point.

Chromatography?

Separates substances by how far they travel.

Sieving?

Separates solids by size.

Magnetic separation?

Uses a magnet to separate metals.

Decanting?

Pours liquid away from a solid.

Why repeat experiments?

To improve reliability (to keep similar)

What is a fair test?

Only the Independent variable changes

Why measure carefully?

To improve accuracy.

Materials?

Equipment needed

Methods?

Step-by-step instructions.

Why write clear methods?

So others can repeat.

Why use tables?

To organise results.

What should tables include?

Title, headings, and units.

Line graph?

Continuous data.

Bar graph?

Categories.

Independent variable goes on...?

X-axis.

Dependent variable goes on...?

Y-axis.

Graphs need...?

Title, labels, units, and scale.

Trend?

Overall direction of data.

Overall direction of data.

Both variables increase.

Negative relationship?

One increases, one decreases.

Pattern?

Repeated result.

Anomaly (outlier)?

A result that doesn't fit.

What goes in a conclusion?

Answer the aim and hypothesis.

What should support your conclusion?

Evidence from results.