Vocabulary
What is a chemical property?
Something you can only see or measure after a reaction happens (i.e: oxidation, flammability)
What happens to the energy level of particles in a solid when you decrease the temperature (make it colder)?
The energy of the particles goes down - they stop moving and reform their bonds
What happens to the particles in ice cream if you leave it outside on a hot summer day?
The bonds start to break and the ice cream turns to a liquid.
In bottle and the balloon lab, what are two things that happened when the bottle was placed in the hot water?
Condensation, made the bottle expand, balloon inflated
What is matter?
Matter is anything that takes up space and has mass.
What is physical property?
Can be seen or measured without changing the substance (like color or texture).
What happens to the energy level of particles in a solid when you increase the temperature (make it hotter)?
The energy of the particles go up - they move more
What happens to the particles in Kool-aid that was left outside in the middle of winter? Is this a physical or chemical change?
The particles start to slow down, forming bonds, and turning into a solid. This is just a physical change.
What are two things that happened when the bottle was placed in ice water in bottle and balloon lab?
Balloon deflated, bottle contracted, water at bottom of bottle
Describe how these things are related:
States of matter
Motion of particles
Energy
States of matter change based on the energy in the particles. The amount of energy the particles have determines the speed.
What is an indicator?
An indicator is a trait/part of a reaction that shows a chemical reaction occurred (like a color change or bubbles).
What is the energy level of particles in a LIQUID?
Medium energy (they can slide past one another but still touch)
It was the first warm day in Spring, and the snow starts to turn into giant puddles. Is this a physical or chemical change?
This is a physical change.
Why is it important for scientists to use computer simulations?
To test things that maybe cannot be seen by the naked eye.
What is the difference between physical and chemical reactions?
Physical reactions do NOT change the substance.
Chemical reactions CHANGE the substance completely (making 1+).
What is a precipitate?
A precipitate is a solid that forms when two liquids mix.
The phase change from water vapor to liquid water is known as...
Condensation
Ella notices her car is starting to rust. Is this a physical or chemical change?
This is a chemical change. Iron reacts with oxygen and water to form a new substance, iron oxide.
What happens to the amount of water particles when ice melts?
Water molecules move past each other and break some bonds.
How is energy related to physical changes in matter?
The amount of energy contributes to phase changes. Higher energy can create heat which leads to melting and evaporation, lower energy can cause freezing.
What is electrical energy?
energy that is caused by the movement of charged particles in an electrical field
What is it called when a solid turns directly into a gas (like dry ice when you have it out at room temperature)
Sublimation
Josh was sitting out by the pool with a glass of lemonade, and noticed that there were droplets of water on the outside of the lemonade glass. What is happening here?
Phase change- condensation
What happened when you added heat to the particles in the computer simulation?
The particles would start to heat up and change state.
What are reactants and what are products? Give and example of each. (Hint= think about the science (math) equations)
Reactants are the original substances before a chemical reaction takes place. Products are the substance(s) after a chemical reaction has happened. The examples can vary. As long as they have products that equal their reactant(s).