Science · Year 1 · The Junior Scientist: Inquiry Skills · Term 3

Making Informed Predictions (Hypotheses)

Students will learn to make informed predictions (hypotheses) before conducting an experiment, justifying their reasoning based on prior knowledge.

• ACARA Content Descriptions
• AC9S1I01

About This Topic

Making informed predictions, or hypotheses, teaches Year 1 students to suggest experiment outcomes based on prior knowledge, not random chance. They practice stating what they think will happen and why, such as predicting a wooden block sinks because it feels heavy like stones they know. This directly supports AC9S1I01, where students pose questions and make predictions to plan fair tests.

Within inquiry skills, this topic distinguishes guesses from scientific predictions and explains their role in guiding experiments. Students connect predictions to observations from daily life, like shadow changes or plant needs, building reasoning habits for future units on earth and space or chemical sciences. Justifying predictions strengthens oral language and critical thinking.

Active learning fits perfectly because students make quick predictions on familiar setups, like magnet pulls or sinking objects, then test immediately in pairs. Group discussions after testing reveal thought processes, encourage evidence-based revisions, and boost confidence in science talk.

Key Questions

1. Explain why scientists make predictions before an experiment.
2. Compare a guess to a scientific prediction.
3. Predict the outcome of a simple experiment and justify your reasoning.

Learning Objectives

• Compare a scientific prediction to a simple guess, identifying key differences in their basis.
• Explain the purpose of making a prediction before conducting a science investigation.
• Formulate a prediction for a simple experiment based on prior knowledge or observations.
• Justify a prediction by stating the reason or evidence supporting the expected outcome.

Before You Start

Observing and Describing

Why: Students need to be able to observe and describe objects and events to build the prior knowledge needed for making predictions.

Asking Questions

Why: The ability to ask questions about the world is foundational to developing curiosity and the desire to make predictions and test them.

Key Vocabulary

Prediction	A statement about what you think will happen in the future, often based on what you already know.
Hypothesis	A scientific prediction that is a testable statement about the expected outcome of an experiment, based on prior knowledge or observations.
Prior Knowledge	Information, experiences, or facts that a person already knows before learning something new.
Justify	To explain or give reasons why you made a particular prediction or came to a certain conclusion.

Watch Out for These Misconceptions

Common Misconception

Predictions are the same as guesses with no reasons.

What to Teach Instead

Predictions draw on evidence, like knowing clay sinks from bath time. Pair prediction charts prompt students to write or draw reasons first, helping them see the difference through talk and testing.

Common Misconception

Predictions must always be right or they fail.

What to Teach Instead

Tests check predictions; surprises lead to new learning. Small group ramp tests show wrong predictions still guide fair trials, building resilience via shared reflections.

Common Misconception

Scientists do not need to explain predictions.

What to Teach Instead

Justification plans better tests. Whole-class shadow demos require reason-sharing before acting, so students practice science talk and link ideas to observations.

Active Learning Ideas

Pairs: Sink or Float Challenge

Pairs select classroom objects and predict if each sinks or floats, drawing their prediction and one reason from past play. They test in shared water trays, observe results, and note matches or surprises. Pairs share one finding with the class.

25 min·Pairs

Small Groups: Ramp Roll Predictions

Groups predict which balls roll farthest down ramps of different heights, using words like 'faster because taller.' They test three times, measure with rulers, and adjust predictions. Groups chart results for class comparison.

35 min·Small Groups

Whole Class: Shadow Length Trial

As a class, predict how a toy's shadow changes when moving a torch closer or farther. Record predictions on a shared chart with reasons. Test together, observe, and vote on pattern explanations.

30 min·Whole Class

Individual: Magnet Attraction Hunt

Each student predicts which items a magnet attracts, listing reasons like 'metal paperclip yes, because fridge magnets stick.' They test at desks, tick correct predictions, and share errors with a partner.

20 min·Individual

Real-World Connections

• Weather forecasters at the Bureau of Meteorology make predictions about rain or sunshine based on patterns they have observed and data from weather instruments, helping farmers plan planting schedules.
• A chef might predict that a cake will rise in the oven because they know that heat causes ingredients like baking soda to expand.

Assessment Ideas

Exit Ticket

Provide students with a scenario: 'You have a toy car and a ramp. What do you predict will happen when you let go of the car?' Ask them to write their prediction and one sentence explaining why they think that will happen.

Discussion Prompt

Present two statements about a simple experiment, for example: 'I think the ball will bounce high' (guess) versus 'I predict the ball will bounce higher on the hard floor than the carpet because the carpet is soft and will absorb some of the bounce.' Ask students to identify which is a scientific prediction and explain their reasoning.

Quick Check

During a hands-on activity, ask students to show you their prediction before they start. Then, ask them to point to the part of their prediction that explains 'why'.

Frequently Asked Questions

What is the difference between a guess and a scientific prediction in Year 1?

A guess relies on luck or feelings alone, while a prediction uses prior knowledge or observations, like 'the ball rolls far because it did on grass.' Teach this by having students label ideas on charts before simple tests. Class discussions reinforce that predictions guide fair experiments and invite testing, unlike guesses.

Why do scientists make predictions before experiments?

Predictions focus inquiries, suggest what to measure, and set expectations for results. In Year 1, this helps students plan tests, like predicting shadow sizes to check light distance effects. When predictions match or differ, students learn evidence drives science, preparing for data analysis later.

How can I teach Year 1 students to justify predictions?

Use sentence starters like 'I predict... because...' tied to experiences. Model with sinking objects, then have pairs practice on magnets before testing. Chart reasons and outcomes class-wide to show strong justifications predict better, building reasoning skills step by step.

How does active learning help teach making informed predictions?

Active tasks like pair sink-float tests let students predict, test, and revise right away, making reasoning tangible. Collaborative sharing uncovers errors gently, while hands-on reps build prediction fluency. This approach fits Year 1 attention spans, links play to science, and sparks excitement for inquiry.