Reactions
almost always irreversible
Chemical Reactions
Ice melting
What is a change in state from a solid to a liquid?
Ductility, flammability & boiling point
What are physical properties?
The purpose of simple machines is to...
What is make work easier, or use less energy to do the same work?
Baking a cake
What is a chemical change?
Do not create new substances
What is a physical change
An example is mixing baking soda and vinegar.
What is an endothermic reaction?
A reaction that the energy flows inside.
What is an endothermic reaction?
Gravity
What is a force that pushes or pulls?
Boiling water
What is change in state?
Creates new substances with new properties
What is a Chemical Reaction?
A camp fire.
What is an exothermic change?
Odor, change in temperature, production of new products.
What are examples of chemical changes?
The amount of matter in a given space.
What is density?
You always need to back up a claim with _____
What is evidence (or data)?
Requires energy
What is breaking a bond during a reaction.
a coffee filter, screen, magnet, evaporation disc
What are examples of separation methods?
An explosion
What is an example of an exothermic reaction?
Distance and Mass
What are the two factors that affect gravity?
Mixing Koolaid and water.
What is a physical change?
An element, H20, table salt, Oxygen.
What are examples of pure substances?
All reactions require bonds to break using this.
What is energy?
Anything that has mass and takes up space.
What is matter?
Ask a question, brainstorm, make a plan, make a prototype, test it, redesign if needed
What is the Engineering Design process?