Water
Cards (17)
- Specific heat capacity definitionThe amount of energy required to raise the temperature of one gram of a substance by one degree
- What is the specific heat capacity of water and what does that mean?Very high - takes a lot of energy to increase temperature
- Explain the specific capacity of waterHydrogen bonds take a lot of energy to be broken before the particles can gain kinetic energy in order to move faster and increase temperature.
- Why is the value of waters specific heat capacity important to living things?Buffers temperature change meaning that enzymes are at the optimum temperature for chemical reaction
- what is latent heat of vaporisation?energy needed to change the state of a substance from liquid to gas
- Why is waters latent heat of vapourisation high?Hydrogen bonds have to be broken before kinetic energy of water molecules can be increased
- How is waters high latent heat of vaporisation important in humans ?Water in sweat takes a high amount of energy to evaporate and this uses up a lot of excess energy the body has when it is overheating , providing a cooling effect
- What is a hydrogen bond?the electrostatic attraction between a slightly positive region on the hydrogen atom of one molecule and the slightly negative charge of the oxygen on a different molecule
- What is a metabolite?Reactant or product of a metabolic reaction
- 2 examples of chemical reactions where water is a metabolite:condensation and hydrolysis
- 3 examples of polymers formed using condensation reactions:proteins, DNA, carbohydrates
- 2 examples of hydrolysis reactions:digestion, conversion of ATP to ADP
- What is cohesion ?attraction of water molecules to each other due to H bonds
- How is cohesion useful within the xylem?allows water to form a continuous column of water molecules so mass flow can occur in the transpiration stream within the xylem
- What is oxygens partial charge?Negative
- What is hydrogens partial charge?Positive
- A hydrogen bond is a weak intermolecular force