Run eleven changes on a virtual lab bench, collect the evidence, and learn to tell every time whether you are looking at the same substance in a new form or a brand-new substance.
NC Science 8 · PS.8.1.4
Matter changes all the time: ice melts, cans get crushed, candles burn, iron rusts. Every one of those changes gets the same single question:
Is it still the same substance, or is there a new substance?
The substance stays the same substance. Only its form changes. There are three things to look for:
Same particles before and after. Only their arrangement or spacing is different.
A chemical reaction makes one or more new substances with new properties. There are four clues to look for:
The atoms rearrange into new kinds of particles, like $\ce{2H2 + O2 -> 2H2O}$.
Glossary (opens in a new tab): physical change, chemical change, chemical reaction, state of matter
Every station is open, so work in any order. A check mark means you logged the evidence, read the particles, classified the change, and explained it correctly.
Tick everything you observed at this station, and nothing you did not.
This is the same change, zoomed in far past what any microscope can show.
A scientist never stops at the label. Build the sentence that proves your answer.
Fourteen changes that fool people. Pick the label and the reason. Your score counts the ones you get on the first try.
Twelve new situations you have not seen in this lab. Get 10 right to earn Mastered. Every retake draws different questions.
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