What is a Chemical Reaction?
In a chemical reaction, old ones are broken and new ones are formed.
chemical bonds
What is the gas required for combustion reactions to occur?
oxygen
Thermal energy is transfered from the body with the (blank) temperature to the one with the (blank) temperature.
higher/lower
gasoline to a car moving
chemical to mechanical
What is the total kinetic energy of particles in a substance called?
heat or thermal energy
The starting substances in a chemical reaction.
reactants
The combustion of hydrocarbons usually produces these two substances.
CO2 and H2O
THe type or thermal transfer when two objects touch each other.
conduction
When candle wax burns, these two forms of energy are produced.
heat/light
As temperature increases, what happens to the motion of the atoms or molecules?
It increases
These are the new substances formed during a chemical reaction.
products
A common gas in combustion reactions used for cooking or lab burners.
This unit is commonly used to measure heat energy in chemistry.
joule
Food to peddling a bike.
chemical to mechanical
What is measures the average kinetic energy of atoms or molecules called.
temperature
This law states that matter cannot be created or destroyed in a chemical reaction.
the law of conservation of energy
If all the hydrocarbon burns, this is called (blank) combustion.
complete
In calorimetry, this symbol represents thermal energy
q
Generator to electrons flowing in a wire.
mechanical to electrical
Water has a high value for this property, because it takes a lot of energy to change its temperature.
specific heat
This is the kind of reaction that gives off more energy than it absorbs.
exothermic reaction
An orange burner flame gives off less energy than a blue one because the combustion is (blank).
incomplete
A common substance that gains much heat with little change in temperature.
water
100 J of electric energy but only 80 J of light produced. What is the efficiency of the system.
80%
What equation is used to calculate heat energy?
q = m c delta t