Apparatus used to investigate whether oxygen is used during aerobic respiration Questions 1. Identify the experiment and the control. Explain your answer. (2) 2. What precaution do you need to take before setting up the experiment? (2) 3. What is the function of the soda lime in the test tube? Explain why this is necessary. • As the beetle respires and uses the gas in the test tube what happens: a) to the volume of the gas in the test tube? (1) b) to the coloured water in the rubber tubing? Why is the test tube kept in water at a constant temperature? (2) What temperature should the water be? Give a reason for your answer. (2) Why is oxygen necessary during aerobic respiration? (2)

this transfer is call conjunction

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.