Science Test Flashcards
Name 2 liquids with low viscosity.
Vanilla extract and water
Name 2 liquids with high viscosity.
Caramel and honey.
Why do some liquids become more viscous when they are cold?
They don’t have as much energy.
How would you separate a mixture of sand and iron shavings?
Use a magnet. The iron would stick to the magnet while the sand would be left behind.
What is the difference between an open and closed system?
In an open system, matter can escape, but not in a closed system.
What is the Law of Conservation of Mass?
Mass can’t be created or destroyed, it can only change form.
What are 3 ways heat can be transferred?
Conduction, convection, and radiation.
Transfer of thermal energy between two substances that are touching.
Conduction
The movement of thermal energy in heated liquids and gasses.
Convection
Transfer of thermal energy with no matter.
Radiation
What is albedo?
The reflectiveness of thermal energy and light.
What is something with high albedo?
Snow
What is something with low albedo?
Black rocks
What is a conductor?
Materials that allow heat to move easily.
What is an insulator?
Materials that do NOT allow heat to move easily.
Conductor or insulator: copper wires, nickel, pots and pans.
Conductor
Conductor or insulator: styrofoam, plastic, and feathers.
Insulator.
What are 5 signs of chemical changes?
- Color
- Odor
- Light
- Sound
- Gas/bubbles
What are 3 signs of physical changes?
- Reversible
- The state changes
- Solubility
What are 2 examples of a chemical change, and how do you know?
Firework- light, sound, heat, and energy are produced.
Burning paper- new substance is created, is not reversible.
What are 2 examples of a physical change, and how do you know?
Ripping paper- it’s still the same substance
Freezing water- it can be reversed.
What are the 3 main states of matter?
Solids, liquids, and gasses.
Solid to gas
Sublimation
Solid to liquid
Melting
