Get started!

  • Stage 1

    Answer 4 questions correctly in a row.

A skier activates a hot pack by rubbing it between his fingers. When chemicals inside the hot pack react, the reaction warms the skier's hands.
The reaction inside the hot pack is the
system,
and the skier's hands are the
surroundings.
Complete the sentences.
The reaction between chemicals inside the hot pack  heat, and the skier's hands  heat. The chemical reaction in the hot pack is an  process.
ref_doc_title.

Confetti

Jumping to stage 1 of 1

Excellent!

Now entering the Challenge Zone—are you ready?

Teacher tools