alleryStart learning →What does an uppercase Greek delta written over a reaction arrow show?
AThe reaction gives off a gas
BThe reaction is run in water
CThe reaction is run in acid
DThe reaction is run by heating
Answer & Solution
Correct answer: D. The reaction is run by heating
1. Special conditions for a reaction are shown by a word or symbol written on the arrow.
2. An uppercase Greek delta over the arrow stands for heating.
3. The decomposition of CaCO3 to CaO and CO2 is written this way.
4. Solvents and gaseous products are shown by state symbols instead, not by the arrow.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 4 "Stoichiometry of Chemical Reactions", section 4.1 Writing and Balancing Chemical Equations_
Keep practising Stoichiometry of Chemical Reactions
Browse all Stoichiometry of Chemical Reactions questions for NECO SSCE, or explore more Chemistry topics.
Related questions
Pop only the soluble compoundsKnock out the false limiting claimsFill in the percent yield formulaOrder the mass to mass routeBalance the splitting of waterIn the old vinegar test, potassium carbonate was added until bubbling stopped. What gas caBurning 0.00126 g of polyethylene gives 0.00394 g CO2 (44.01 g/mol) and 0.00161 g H2O (18.A 0.4550 g mixture treated with excess Ba(NO3)2 gives 0.6168 g of BaSO4 (233.43 g/mol). Wh