Physical Changes
This physical change occurs when water goes from a liquid to a gas at 100 degrees Celsius.
What is boiling?
The browning of a sliced apple left in the air is an example of this chemical process.
What is oxidation?
When this common household ingredient is mixed with vinegar, it creates carbon dioxide gas, causing bubbling and fizzing.
What is baking soda?
This process happens when solid water turns directly into vapor without becoming liquid first, often seen in cold climates.
What is sublimation?
This chemical change happens in the body as enzymes break down food into smaller molecules for energy and nutrients.
What is digestion?
When exposed to moisture and air, this metal undergoes a chemical change and forms rust.
What is iron?
This physical process separates a mixture of salt and water by removing the water as vapor, leaving the salt behind.
What is evaporation?
This process makes bread dough rise due to carbon dioxide gas produced by yeast.
What is fermentation?
The bright light and heat released when wood is burned in a campfire are evidence of this type of chemical reaction.
What is combustion?
This gas is produced when an acid interacts with a Carbonate.
What is Carbon Dioxide (CO2)?
This reaction, often seen in cleaning, happens when bleach removes stains from clothes
What is oxidation?
This gas will reignite a glowing splint, a classic test for its presence after certain chemical reactions.
What is oxygen?
When you dissolve this in water, it separates into ions but can be recovered by evaporating the water, demonstrating a reversible physical change.
What is a salt?
This chemical change occurs in plants, using sunlight to convert carbon dioxide and water into oxygen and glucose.
What is photosynthesis?
When a copper penny is left in vinegar, it undergoes a chemical change and becomes shiny due to the removal of this layer.
What is tarnish?