(Q).
Answer the following question given this paragraph: A: Other examples of liquid mixtures include salt water and salad dressing. Air is a mixture of gases, mainly nitrogen and oxygen. The rock pictured in the Figure below is a solid mixture. Q: What two gases are the main components of air? Choices: - oxygen and helium - carbon and oxygen - hydrogen and helium - nitrogen and oxygen A:
(A).
nitrogen and oxygen

(Q).
Answer the following question given this paragraph: An acid also produces negative ions, and a base also produces positive ions. For example, the acid hydrogen chloride (HCl), when dissolved in water, produces negative chloride ions (Cl - ) as well as hydrogen ions. The base sodium hydroxide (NaOH) produces positive sodium ions (Na + ) in addition to hydroxide ions. These other ions also combine when the acid and base react. They form sodium chloride (NaCl). This is represented by the equation:. Q: When dissolved in water, the base sodium hydroxide (naoh) produces sodium ions with what charge? Choices: - constant - similar - negative - positive A:
(A).
positive

(Q).
Answer the following question given this paragraph: Electron transport is the final stage of aerobic respiration. In this stage, energy from NADH and FADH 2 , which result from the Krebs cycle, is transferred to ATP. Can you predict how this happens? ( Hint: How does electron transport occur in photosynthesis?). Q: What is the final stage of aerobic respiration, when energy from the krebs cycle is transferred to atp? Choices: - glycolysis - acetyl-CoA - cytoplasm transport - electron transport A:
(A).
electron transport