Investigation 1
What 2 factors affect kinetic energy (KE)?
Mass & Velocity
What kind of energy does a stretched out spring have?
Potential energy (specifically elastic potential energy)
Will atoms bond at a short or far distance?
Short
An ionic bond is between...
A metal and nonmetal
When a chemical reaction occurs what happens to the number of atoms before and after the chemical reaction?
The number of each type of atom stays the same
What 2 factors affect gravitational potential energy here on Earth (assume gravity stays the same)?
Mass & Height
A Van De Graaf generator has electric potential energy. Where is this energy stored?
The electric field of the Van De Graaf
Atoms will bond when potential energy is...
low
A covalent bond is between...
A nonmetal and nonmetal
Making bonds ___________ energy, while breaking bonds ____________ energy.
absorbs, releases
What is the law of conservation of energy?
Energy cannot be created or destroyed only transferred into different forms
Why is lightning bigger than the spark from the Van De Graff generator?
Clouds are able to store more electric potential energy than the Van de Graaf generator
What happens to the forces between the atom when atoms are bond?
Attractive and repulsive forces are balanced
What is the name of the following Ionic bond: CaCl2
Calcium Chloride
A chemical reaction occurs in the test tube. You notice that the test tube feels cold to the touch. What type of chemical reaction is occurring?
Endothermic
Why does a basketball eventually stop bouncing if energy cannot be destroyed?
The energy with transfer to the environment in forms of energy such as thermal and sound
Describe the energy transfers that occur when you stretch out a spring and let go.
Starts with electric potential energy that is converted to KE as it moves. As the spring gets compressed it converts back to PE, then KE as it ocalates. Eventually the KE converts to Thermal energy due to friction with the surroundings.
Atoms with a [greater / lower] binding energy will make a bond.
greater
What is the chemical formula of the compound sulfur dioxide?
SO2
When the energy involved in breaking bonds is less than making the bonds the chemical reaction is...
exothermic
Why does hot water have more energy than cold water?
The water molecules are moving faster in hot water and therefore have more KE
Explain the energy transfers when two like sided magnets are placed next to each other.
Magnetic potential energy stored in the magnets magnetic field will increase as the magnets are brought close to each other. This potential energy will convert to KE as the magnets move away from each other and the KE will convert to thermal energy to the surroundings as the magnets stop moving
In order for an atom to break the bond of another molecule the KE of the atom must be [greater than / less than ] the binding energy.
Greater than
What is the chemical formula for Magnesium fluoride?
MgF2 (Crossover Method)
Balance the equation:
___H2O2 --> ___H2O + ___O2
2, 2, 1