A student investigated the chemical properties of various gases and liquids.
The student reacted magnesium ribbon 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 reaction of hydrogen with oxygen of the form:
‾ H2(g)+‾ O2(g)→‾ H2O(g) \underline{\quad\quad} \text{ H}_2(\text{g}) + \underline{\quad\quad} \text{ O}_2(\text{g}) \rightarrow \underline{\quad\quad} \text{ H}_2\text{O}(\text{g}) H2(g)+ O2(g)→ H2O(g)To show that a colorless 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 used in some fire extinguishers to smother electrical fires. State a physical property of carbon dioxide that allows it to settle over a fire and displace oxygen.
Argon is used to fill incandescent light bulbs to protect the tungsten filament. State the chemical property of argon that makes it suitable for this purpose.
Write a chemical equation, including state symbols, to show the physical process that occurs when nitrogen gas is liquefied.
