Which test is used to identify carbon dioxide? What is the positive result?

In the reaction below, _____________ undergoes oxidation. Please choose the reactant that fits in the blank.

Ammonium chloride is added to water containing universal indicator. The universal indicator turns green. What is the pH of the solution?

True or False: Sexual reproduction involves fusion of nuclei and produces genetically identical offspring.

The letters are not the symbols for the elements. Which letter of the element forms an ionic compound with element P?

Sodium carbonate is added to vinegar in a beaker and stirred. The reaction causes water in the watch glass to freeze. Would this reaction be an endothermic or exothermic reaction?

Diagram below shows the structure of the heart. Which labelled part has the correct function stated?

Substance X is dilute sulphuric acid. Can you identify gas P and gas Q respectively?

The diagram represents a food chain. How many consumer levels are there?