A student investigated the production and properties of gases and the tests used to identify water.
The student reacted magnesium metal with dilute sulfuric acid to produce hydrogen gas. State two observations that the student could make during this reaction.
Complete the word equation for this reaction:
magnesium+sulfuric acid→+ \text{magnesium} + \text{sulfuric acid} \rightarrow \text{\quad\quad\quad\quad\quad\quad} + \text{\quad\quad\quad\quad\quad\quad} magnesium+sulfuric acid→+Balance the chemical equation for the synthesis of ammonia of the form:
‾ N2(g)+‾ H2(g)→‾ NH3(g) \underline{\quad\quad} \text{ N}_2(\text{g}) + \underline{\quad\quad} \text{ H}_2(\text{g}) \rightarrow \underline{\quad\quad} \text{ NH}_3(\text{g}) N2(g)+ H2(g)→ NH3(g)To show that a colourless liquid is pure water, the student performed a chemical test and a physical test.
The chemical test involved adding a few drops of the liquid to a sample of anhydrous copper(II) sulfate. State the colour change observed.
Choose the formula of the hydrated compound formed in this chemical test from the options below:
The physical test involved measuring a physical property of the liquid. State a suitable physical property and its value for pure water at standard pressure.
Carbon dioxide is commonly used in fire extinguishers. State a property of carbon dioxide that makes it suitable for extinguishing fires.
Water is not used to extinguish electrical fires. State the property of tap water that makes it unsafe for this purpose.
Write a chemical equation, including state symbols, to show the physical process that occurs when carbon dioxide gas undergoes deposition (solidification directly from gas) to form dry ice (solid carbon dioxide).
