Vocabulary
These are the characterstics of an object and you use your senses to identify them.
What are PHYSICAL PROPERTIES?
Is Alka-Seltzer and water an example of a physical change?
What is NO? When you mix Alka-Seltzer and water, bubbles form, which indicates a chemical change as taken place.
Name the six indicators of a chemical change.
What are color change, gas bubbles, temperature change, light emission, smell or odor, or precipitate formation?
Name the states of matter.
What are SOLID, LIQUID, GAS?
Opening a carton of sour, spoiled milk gives off a terrible smell, providing a clear chemical clue known by this 4-letter word?
What is an odor?
Anything that has mass (weight) and takes up space.
What is MATTER?
Is rust an example of a physical change?
What is No? You cannot change rust back into the metal is was before; therefore, it is a chemical change.
Is a melted popsicle an example of a chemical change?
What is NO? You can melt and refreeze a popsicle and it will still be a popsicle, so it is a Physical Change.
Saliva converting a caracker's starch molecules into simple sugars is an example of what type of change?
What is a CHEMICAL CHANGE?
Name 2 physical properties of water.
What is liquid, wet, odorless, etc.
An solid forming from a chemical reaction.
What is a PRECIPATE?
Melting, freezing, boiling, and condensing are all examples of changes in what. What type of change is this?
What is a change in the state of matter? This is a physical change.
Name a food that is an example of a chemical change and explain why.
What is a cake, because you cannot turn a cake back into the eggs, flour, sugar, etc. that you mixed together?
As iron is exposed to air and water over time a chemical change will occur, name the term used to describe this change.
What is RUSTING?
Evident by the appearance of bubbling or fizzing.
What is a GAS?
When you mix sugar or salt into water, it disappears, but it can easily be recovered by doing this to the liquid.
What is evaporation?
When baking soda is mixed with vinegar, the rapid formation of these inside the liquid signifies that a new gas has been produced.
What are bubbles? What is fizzing?
These molecules move rapidly and freely whereever there is open space.
What is a GAS?
When a pumpkin rots on the porch after Halloween and turns into mush, it is going through this natural process of breaking down. What is the name of this process? Would this be a chemical or physical change?
What is decomposition? This is a chemical change.
When gas or vapor changes into a liquid (ex: steam changes into water)
What is a CONDENSATION?
CHALLENGE (not a quiz question): Explain how the water cycle an example of a physical change.
What is YES, it is a physical change, because water changes from a liquid/solid when it precipitates, to a gas when it evaporates, then forms back into a liquid when it condensates. Then the process repeats again with the same substance, WATER!
True or False. Hydrochloric Acid and pepsin digest proteins into amino acid in the stomach. This is a chemical change. Explain your answer.
What is TRUE? The food in the stomach is becoming a new substance - proteins to amino acids.
Identify 1 example of a precipitation, condensation, and evaporation.
Precipitation = rain water
Evaporation - Boiling water
Condensation - Water drops on a lemonade glass
Identify one process in digestion that is a chemical change and one that is a physical change.
What is chewing my food is a physical change? What is the process of breaking down food into smaller molecules is a chemical change?
Energy released through a change in visible light such as glowing
What is LIGHT?
What is the process that takes place when making cheese or milk sours?
What is a precipitate forming?
A campfire burning wood produces what new substance? Name 2 pieces of evidence that suggest a new substance was created?
What is smoke and ash? What is light, color change, or temperature change?
Green plant leaves absorbing carbon dioxide and water to synthesize glucose sugars is known as what process? What type of change is this?
What is photosynthesis? What is a chemical change?
The wave-like muscle contractions that move swallowed food down the esophagus is this type of change.
What is a physical change?