In the Kitchen
Baking soda and vinegar are mixed and start fizzing
What is a chemical reaction?
Evidence - A new gas forms
A candle wick burns with a bright flame.
What is a chemical reaction?
Combustion releases light and heat and produces new gases.
Fireworks explode in colorful bursts.
What is a chemical reaction?
A glow stick is bent, snaps, and starts glowing.
What is a chemical reaction?
Two chemicals mix and give off light.
You get your hair cut at the barbershop.
An ice cube melts in a glass of water
What is a state change?
Evidence: solid turned to liquid
Candle wax drips down the side and hardens.
What is a state change? Wax changes from solid to liquid
A puddle dries up on a sunny afternoon.
What is state change?
Liquid into water vapor (gas)
Salt and sand are stirred together in a bowl.
What is a mixture?
Bonus points for type of mixture.
Sweat on your skin dries up and helps cool you down.
Bread turns brown and crispy in a toaster
What is a chemical reaction?
New substances form, with new color, smell, and taste, and the change cannot be undone.
A bike chain left out in the rain turns orange-brown.
What is a chemical reaction?
Evidence - Iron reacts with oxygen and water to form iron oxide (rust).
Green leaves use sunlight, water, and CO₂ to make sugar.
What is a chemical reaction?
Photosynthesis
A pot of boiling water is full of bubbles.
What is a state change?
You chew a plain cracker for a long time and it starts to taste sweet.
What is a chemical reaction?
An enzyme in saliva breaks starch into sugar, a new substance with a new taste.
Sugar disappears when stirred into hot tea.
What is dissolving?
Aluminum foil is torn into tiny pieces.
What is the aluminum foil just got smaller and changed shape?
Water freezes in a rock’s crack and splits the rock apart.
What is physical weathering?
Two clear liquids are mixed, and a cloudy yellow solid appears.
What is a chemical reaction?
A precipitate (a new solid) formed.
Your cells combine sugar and oxygen to release energy, water, and carbon dioxide.
What is a chemical reaction?
Cellular respiration rearranges atoms into new molecules and releases energy
Milk left for days smells sour and forms lumps.
What is a chemical reaction?
Evidence - Bacteria produce new substances (lactic acid), giving off an odor and forming solids
Hydrogen peroxide bubbles when poured on a scraped knee.
What is a chemical reaction?
Catalase in your blood breaks it down into water and oxygen
The copper Statue of Liberty turned from shiny brown to green.
What is a chemical reaction?
Copper reacted with air and moisture to form a new green compound (patina).
Blue paint and yellow paint are mixed and turn green.
What is a mixture?
Bonus points for type of mixture.
You take an antacid tablet, and it calms the acid in your upset stomach.
What is a chemical reaction?
Neutralization. The base in the tablet reacts with stomach acid to form new substances (water and a salt).