The state of matter


The state of matter: solid and liquid – exploring the change


Introducing the concepts „the state of matter”, „solid” and „liquid”
Shaping the comprehension of the chemical processes underlying the state of matter change (freezing, melting, dissolving, crystallizing, solidifying);
Exploring the function of external factors in turning the state of matter (inhibitors and catalysts such as: salt, temperature, wrapping etc.)
Developing the skills of observing the chemical and physical processes
Strengthening the exploratory attitudes in children

Intended Learning Outcomes

The child will be able to:

  • explain the concepts of liquid / solid and differentiate between freezing, melting, crystallizing, solidifying
  • participate in experiments under the supervision of a teachers
  • observe the process of turning the state of matter into a different one (freezing, melting, dissolving, crystallizing, solidifying);
  • draw conclusions about factors inhibiting and catalyzing the process of changing the state of matter
  • design his/ her own experiments related to the topic (using materials provided by a teacher);
  • reflect on his/ her own learning results

The structure of the learning pathway

Stage I

Introducing the concept „the state of matter”, „solid” and „liquid”. Introducing the scientific terms into child’s everyday language. Understanding the the process of turning the liquid into solid may take a different form (freezing, crystallizing, solidifying).

Stage II

Exploring the external conditions and factors influencing the state of matter changes – recognizing the 2 types of factors: inhibitors and catalysts in the process of melting the ice or chocolate and solidifying the substances

Stage III

Between solid and liquid – exploring unusual/ atypical substances.


Initial – building a mind-map (What do I know about? What I would like to learn about…? – activating the prior knowledge of children

Ongoing – described in every resource

Final assessment

  • Reflection with the mind map prepared at the beginning – What have we learned? What was the most intriguing? What else would we like to know about different states of matter?
  • Voting for the most interesting experiment (children can put the sticker under the photo presenting their favorite experiment)
  • Self-evaluation of one’s own learning process – with the chart prepared by a teacher

1. I can recognize liquid and solid
2. I can explain when and how the solid changes into liquid
3. I can delay and speed up the process of ice melting
4. I can make a non-newtonian liquid
5. I know what is the process of crystallizing
6. I know what is „an experiment”
7. I can observe and make notes
8. I like to conduct scientific experiments in the preschool
9. I can be a cautious scientist – I know how to behave safely in scientific laboratory


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