Exothermic or Endothermic
Exothermic reactions feel _______ and endothermic reactions feel _______.
Warm, Cool
Give two examples of exothermic reactions.
Combustion, respiration
Atoms are made up of three smaller particles called...
Protons, Neutrons, Electrons
Define Compound
Two or more elements, chemically combined
Bond making is.....
Exothermic
Give two examples of endothermic reactions.
Thermal decomposition reactions, citric acid and sodium hydrogencarbonate. Photosynthesis
What type of acid reactions releases carbon dioxide as a product?
Acid + Carbonate
What equipment do you need for the C5 RP?
Polystyrene/insulating cup
Lid
Thermometer
measuring cylinder/balance
Ammonium Chloride is mixed with water and the temperature decreased by 10 degrees. Is this reaction exothermic or endothermic?
Endothermic.
State two uses of exothermic reactions
Self-heating cans, hand warmers
Define: Isotope
Variants of a chemical element that contains a different number of neutrons than normal
Diamond is made out of what element?
Carbon.
Bond breaking is.....
Endothermic
State two uses of endothermic reactions
Self cooling can, instant ice pack
How many electrons does an atom have if it contains 20 protons but has a charge of -2?
22 electrons
How do you make energy changes RP more accurate?
Repeat and calculate a mean
Measure the max/min temp reached
Define the term: activation energy
The amount of energy input required to activate/start a reaction.
What is the dependent variable in the energy changes RP
TEMPERATURE
What type of ion does a metal form? how?
Positive. It loses electrons
Who is credited with the invention of the modern periodic table?
Mendeleev