Fire cracker manufacturers use metal salts to bring color to firework displays. Seeing yellow sparks indicates the presence of what metal salt?*CopperCalciumPotassiumSodium

When carrying out a flame test, which cation is identified by a yellow flame? Hydrogen, H+Copper II, Cu2+Sodium, Na+Lithium, Li+2What is meant by the term ‘precipitate’? Insoluble solidColourless gasClear solutionColoured solution3Which metal ions all form white precipitates when added to sodium hydroxide solution? Al3+, Na+ and K+Li+, Na+ and K+Al3+, Mg2+ and Cu2+Al3+, Mg2+ and Ca2+4How would you test whether a white precipitate formed in sodium hydroxide solution is the calcium Ca2+ ion?Does not dissolve in excess NaOH, burns with an orange-red flameDissolves when excess NaOH addedDoes not dissolve in excess NaOH, burns with no colourDoes not dissolve in excess NaOH, burns with a crimson flame5Which metal ion forms a green precipitate when added to sodium hydroxide solution?Copper (II), Cu2+Copper (I), Cu+Iron (III), Fe3+Iron (II), Fe2+6What is the balanced equation, with state symbols, for the reaction of iron(II) chloride with sodium hydroxide solution? FeCl (aq) + 2NaOH (aq) → 2NaCl (aq) +Fe(OH)2 (s)FeCl2 (aq) + NaOH (aq) → NaCl (aq) +FeOH (s)FeCl2 (aq) + 2NaOH (aq) → 2NaCl (aq) +Fe(OH)2 (s)Fe2Cl2 (aq) + 2NaOH (aq) → 2NaCl (aq) +2FeOH (s)

Which of the following metals burn with brick red flame?A. PbB. CaC. NaD. Mg

When a metal is put in water it starts floating and some gas is evolved from it without any fire. A burning candle is put off with a pop sound when a candle is exposed to this gas. The metal can be ____ .a. potassiumb. lithiumc. irond. magnesium

Iron or steel hand tools may produce sparks that can be an ignition source around flammable substances. Where this hazard exists, spark-resistant tools made of non-ferrous materials should be used: A. True B. False

is metal glowing hot a chemical change