What is the color of the aqueous product of the reaction of hexaaquacopper(II) and chlorine? turquoise false sea green true blood red false lemon yellow false Single Which of the following statements best describe the group of elements in the periodic table called the "Noble gases"? They can only exist in a gaseous state false They tend to be unreactive with most elements true This group includes Oxygen and Carbon false They are all artificially-made elements false Single The combustion of which of the following compounds produces a greenhouse gas? SO₂ false CH₄ true Fe₂O₃ false CFCl₃ false Single What is the chemical formula for the compound called "acetylene"? C₂H₂ true CH₄ false C₁₂H₁₁O₂₂ false CH₃COOH false Single What is the full name of the compound with the chemical formula H₂O₂? hydrogen oxide false hydrogen peroxide true dihydrogen monoxide false hydroxyl false Single What is the difference between sodium bicarbonate and sodium carbonate? one of them contains sodium false one of them contains carbon false one of them contains oxygen false one of them contains hydrogen true Single How many oxygen atoms are in a molecule of calcium carbonate, CaCO₃? 0 false 1 false 2 false 3 true Single Which of the following scenarios best reflect the Law of Conservation of Mass? Paper can be destroyed by burning it but can be restored if its smoke is cooled false Atoms cannot be split into lighter particles nor heavier particles false An atom of oxygen may have different numbers of neutrons false The total mass of A and B are unchanged before and after a reaction true Single Which of the following types of food involve the Maillard reaction during their preparation? yogurt false ice cream false hard-boiled egg false cookies true Single Which of the following substances is a molecule but not a compound? He false H₂O false Na₂₊ false O₃ false Single