Chemical change
What are four pieces of evidence of a chemical change?
Sound, colour change, bubbles observed, light, temperature change.
State the law of conservation of mass.
Matter cannot be created or destroyed (in a chemical reaction).
What is a hydrocarbon?
A comound that contains the elements hydrogen and carbon.
An ice cube melting.
Endothermic
Write the generalised word equation for an acid-metal reaction.
acid + metal --> hydrogen gas + salt
The arrow points to products.
How many of each type of atom are in the following compound?
3Fe(OH)3
3x Fe
9x O
9x H
What are the two reaction conditions required for photosynthesis?
Chlorophyll and light
Endothermic or exothermic?
Acid-metal reaction
Exothermic
Write the generalised word equation for an acid and a metal carbonate.
acid + metal-carbonate --> salt + water + carbon dioxide
A catalyst, heat and light are all examples of what?
Reaction conditions
CH4 + O2 --> H2O + CO2
CH4 + 2O2 --> 2H2O + CO2
What is the reaction condition required for cellular respiration?
Enzymes (catalyst)
Exothermic or endothermic?
Photosynthesis.
Endothermic
Ethanoic acid + calcium
Acid-metal
Is melting a candle an example of a chemical or physical change?
Both
Complete and balance the following equation
C6H12O6 + O2 -->
C6H12O6 + 6O2 --> 6H2O + 6CO2
What is incomplete combustion?
When there is not sufficient oxygen to completely react in a chemical reaction.
In combustion, do the reactants or the products have more enthalpy (energy stored between the bonds)?
Reactants
Identify the type of reaction.
H2SO4 + CaOH --> CaSO4 + H2O
Acid-base
What is the term given to the energy required for a chemical change to occur?
Activation energy
Write the balanced equation for photosynthesis and draw the energy profile diagram to represent the change in enthalpy.
6H2O + 6CO2 --> C6H12O6 + 6O2
See whiteboard
When methane gas has undergone incomplete combustion, what product is created in addition to water?
Carbon monoxide
In photosynthesis, do the reactants or the products have more enthalpy (energy stored between the bonds)?
Identify the salt produced between vinegar and calcium carbonate.
Calcium ethanoate or Calcium acetate