Naming and Writing Formulas
This compound has the chemical formula CaCl₂.
calcium chloride
A solution with a pH of 1 is classified as this.
strong acid
This product is always formed when an acid reacts with a base.
water/salt
Identify the reaction type:
Mg + 2HCl → MgCl₂ + H₂
single displacement
Red cabbage juice is used as this type of substance in chemistry experiments.
an indicator
Write the formula for aluminum oxide.
Al₂O₃
This ion is responsible for the basic properties of a solution.
OH⁻ (hydroxide ion)
Phenolphthalein turns this colour in a basic solution.
pink
Identify the reaction type:
2H₂O → 2H₂ + O₂
decomposition
During the red cabbage lab, a solution turned pink. This indicates the solution is likely what?
acidic
This compound contains the polyatomic ion sulfate and an alkali metal
sodium sulfate (Na₂SO₄)
A solution changes red litmus paper blue. Identify the solution.
a base
Hydrochloric acid reacts with sodium hydroxide. Name the salt produced.
sodium chloride
Predict the products:
BaCl₂ + Na₂SO₄ →
BaSO₄ + 2NaCl
Name two observations that indicate a chemical reaction may have occurred.
colour change, gas production, precipitate formation, temperature change, or light production
Write the formula for magnesium phosphate.
Mg₃(PO₄)₂
Compare the concentration of hydrogen ions in a solution with pH 3 and pH 5.
pH 3 has 100 times more hydrogen ions
A solution changes blue litmus paper red and has a pH of 2. Identify two pieces of evidence that indicate it is acidic.
pH below 7 and turning blue litmus red
A white precipitate forms when two aqueous solutions are mixed. This is evidence of which reaction type
double displacement
A student tests two colourless liquids. One conducts electricity and one does not. What can be concluded about the conducting solution?
it contains ions
Name the compound Fe₂O₃.
iron(III) oxide
A student claims a pH 10 solution is only slightly more basic than a pH 8 solution. Explain why the statement is incorrect.
because the pH scale is logarithmic and pH 10 is 100 times more basic than pH 8
A solution with a pH of 11 would be classified as this.
base
Explain why the formation of a precipitate indicates that a chemical reaction has occurred
because a new substance with different properties has formed
A student measures the pH of lemon juice as 2 and soap as 10. Which substance contains more hydrogen ions?
lemon juice