This question is about some gases present in air and the laboratory preparation of carbon dioxide.
Which is the third most common gas in dry air? A. argon B. carbon dioxide C. nitrogen D. oxygen
Which gas makes up approximately 78% of dry air? A. argon B. carbon dioxide C. nitrogen D. oxygen
A sample of copper powder is heated strongly in open air. State the formula and colour of the solid compound formed.
Carbon dioxide gas can be prepared in the laboratory by adding a liquid dropwise from a tap funnel into a conical flask containing a solid reactant. The liquid in the tap funnel is: A. dilute hydrochloric acid B. dilute sulfuric acid C. hydrogen peroxide solution D. water
The solid reactant in the conical flask is: A. calcium carbonate B. copper(II) oxide C. manganese(IV) oxide D. zinc
Suggest why collecting carbon dioxide gas over water is less efficient than using a gas syringe.
Carbon dioxide can also be produced by the thermal decomposition of copper(II) carbonate. Complete the equation for this reaction by inserting the missing state symbols: CuCO3(...)→CuO(...)+CO2(...)\text{CuCO}_3(\text{...}) \rightarrow \text{CuO}(\text{...}) + \text{CO}_2(\text{...})CuCO3(...)→CuO(...)+CO2(...)
Describe the test used to identify carbon dioxide gas and state the expected observation.
