Types of Energy
What is the definition of heat?
The transfer of thermal energy between two things/Energy transfer between two objects at different temperatures
Name one place that polar bears live
What is an atom?
Basic building block of everything
What is the conservation of mass?
Matter cannot be created or destroyed in a chemical reaction
What is the definition of potential energy?
Stored or still energy
If thermal energy is removed from a system, what happens to the system?
Temperature decreases, kinetic energy decreases
Two or more atoms chemically combined
What is a chemical reaction?
Two or more substances are combined and the atoms are rearranged to form new substances
What is kinetic energy?
What is colder on average, Antarctica or the North Pole?
Antarctica!
What is a subscript?
The number of atoms of an element that are in a molecule
If my products in a chemical equation weigh 32 g how much should my reactants weigh?
32 g
What is the definition of thermal energy?
Kinetic and potential energy of the molecules
If thermal energy is added to a liquid, what happens to it?
Molecules move faster and turn into a gas
What is a coefficient?
The number of molecules that are present
Fill in the blank in the following chemical equation weight:
Na + HCO2 --> NaCO + OH
3g + ____ --> 4g + 6g
7g
Conductivity and number of atoms are two of the three factors that determine thermal energy. What is the third factor?
Temperature
0 Degrees Celsius
How many atoms of each element do I have in the chemical formula: 3NaHCO3
Na (Sodium) - 1 x 3 = 3
H (Hydrogen) - 1 x 3 = 3
C (Carbon) - 1 x 3 = 3
O (Oxygen) - 3 x 3 = 9
Name an example of an experiment we did in class that did not show the conservation of mass, and one that did
Did: chemical reaction in a bag, balloon and the beaker