Btec Applied Science Unit 1 Chemistry Questions And Answers

What type of exercise are slow twitch muscles designed for? {Ans: Aerobic exercise}Explain why red blood cells have a biconcave shape {Ans: Increased surface area for gas exchange}Explain why sperm cells have a shaped head {Ans: To push through the protective layer of the egg cell}How are permanent dipole-dipole forces formed? {Ans: Permanent dipole in one molecule attracts oppositely charged permanent dipole in neighbouring molecule}Describe the trend in reactivity down group 1 {Ans: They become more reactive down the group}Describe the trend in first ionisation energy down groups 1 and 2 {Ans: First ionisation energy decreases}Which subshells are available in the first energy level? {Ans: s}Describe the adaptations found in a palisade cell {Ans: Closely packed together Chloroplasts Large vacuole}How fast do electromagnetic waves travel in a vacuum? {Ans: All electromagnetic waves travel at the same speed in a vacuum. 3 x 10^8}Explain why egg cells have a zona pellucida (protective layer) {Ans: Protects the cell and only allows one sperm cell to enter.}Why do myelinated neurones transmit action potentials quicker than non-myelinated {Ans: Insulated by myelin sheath Impulse 'jumps' from node to node (where the sodium gates are