Reactions
Phases of Matter
Heat Transfer
Substances
Energy
100
Evidence that a chemical reaction has occurred is...
Bubbling, color change, temperature change, new substances formed.
100
The phase of matter in which the particles travel the fastest and the farthest apart.
Gas!
100
What kind of heat transfer is it when a solid is involved?
Conduction
100
Give me an example of a substance.
Everything. O, H2O, He, NaCl...
100
What is kinetic energy?
The energy of motion.
200
What is a chemical reaction?
When starting substances change into new, different substances.
200
The phase of matter in which an object will freeze.
Liquid
200
Energy is defined as what?
The ability to do work
200
Give me an example of a Heterogenous mixture
meatballs & spaghetti, colored M&Ms, Soda & ice, Salad...etc
200
True or false: All objects are always in motion (always have a little bit of kinetic energy).
True!
300
What happens to atoms when a chemical reaction occurs?
They rearrange. (are not created or destroyed)
300
What needs to happen in order for a substance to Evaporate?
A liquid needs to be heated so that it turns into a gas.
300
Fire gives off heat and is not considered matter. What is fire considered?
A chemical reaction
300
Give me an example of a Homogeneous mixture
Water, air, chocolate pudding... etc.
300
If Iron and water are the same temperature, which has more energy? Why?
Neither, they are at equilibrium.
400
True or false: A chemical reaction always occurs when substances combine?
False!
400
Take a look at this heat graph and tell me in which section is the substance turning into a gas.
Section D-E
400
Sea breeze is the result of which kind of heat transfer?
Convection
400
What is a compound? Give a SPECIFIC example.
Two or more elements combined. Example H2O, NaCl, CO2 etc.
400
Energy coming from heat is called what?
Thermal energy
500
Write an example of a chemical reaction using chemical formulas.
H2 + O2 = H2O
500
The law of conservation of mass states that Mass cannot be created or destroyed, only rearranged. Describe an experiment that will prove this law.
Substances need to be in a weighing device and in a CLOSED system to be able to prove this law.
500
Describe how fire transfers heat
All 3 ways. Give examples of all 3 ways.
500
What is a difference between melting and dissolving?
Melting needs one substance while dissolving needs two.
Melting requires heat, dissolving does not.
500
Name 2 types of potential energy...
Elastic and gravitational