[!]STUDY GUIDE: Big IdeasUse to answer form questions
1.Mass is always conserved; atoms rearrange but aren't created or destroyed. Students often think mass is lost or gained in chemical reactions, but evidence from investigations shows otherwise. Use data from today's stations to identify which observations best support this understanding.
2.Chemical changes form new substances; physical changes alter form but not composition. Students often think difficulty distinguishing chemical from physical changes, but evidence from investigations shows otherwise. Use data from today's stations to identify which observations best support this understanding.
3.Atoms are conserved; they rearrange into new molecules but aren't destroyed. Students often think reactions destroy or create atoms, but evidence from investigations shows otherwise. Use data from today's stations to identify which observations best support this understanding.
DRAWKEY TERMSGoogle each → Images tab → sketch what you see
OTHER VOCAB: precipitate · indicator · exothermic
Chemical Reaction
Process where substances transform into new substances
Reactant
Starting substance in a chemical reaction
Product
New substance formed in a chemical reaction
Conservation of Mass
Mass is neither created nor destroyed in reactions
WRITEFOCUS QUESTIONYour initial thinking
You snap a glow stick at a concert and it blazes neon green. Hours later it is dim; by morning it is dead. The chemicals inside mixed when you bent the tube, but something ran out -- even though the stick weighs exactly the same.
Why do glow sticks eventually stop glowing?
I think...
WRITEAFTER HOOK FORMReflect before continuing
I learned that...
Station 1 — Reaction Evidence Lab
I observed that...
This shows that...
The key concept is...
CHECKDAY 1 CHECK-INBefore you leave
Q1:Based on today's investigation of evidence of chemical reactions,
explain one key finding using evidence from your data. Connect your
answer to this week's focus question: Why do glow sticks eventually
stop glowing?
Confidence:
Evidence of Chemical Reactions (Day 2)
Name: Period:
Station 2 — Mass Conservation Investigation
The data shows...
This connects to...
The main idea is...
This connects to what we learned because...
I can apply this by...
DRAWCONCEPT MODELShow your understanding visually
Draw a model that shows the main concept. Include labels and arrows
to explain relationships.
Labels included
Relationships shown
Key terms used
CHECKTEST YOUR THINKINGRate each: FALSE ← 1-2-3-4-5 → TRUE
1. When something burns, mass is lost because the material disappears.
F12345T
2. Dissolving sugar in water is a chemical change because the sugar disappears.
F12345T
3. Chemical reactions destroy atoms and create new ones to form products.
F12345T
4. In a chemical reaction, atoms rearrange into new molecules but the total number of each type of atom stays the same.
F12345T
5. Evidence of a chemical reaction includes color change, gas production, temperature change, or precipitate formation.
F12345T
Pick any TWO statements -- especially any you rated 2, 3, or 4. Justify your rating with evidence:
Statement #___ -- I rated it ___ because:
Statement #___ -- I rated it ___ because:
THINKSCIENTIST CIRCLE DEBRIEFReflect after your Scientist Circle discussion
AHA! Moment
The one I changed my thinking most about is...
Remaining Question
I still wonder...
WRITEFOCUS QUESTION REVISITFinal written response
Why do glow sticks eventually stop glowing?
Word Bank: chemical reaction · reactant · product · conservation of mass · precipitate · indicator · exothermic