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NECO SSCE Stoichiometry of Chemical Reactions — practice questions

Explore 79 free Stoichiometry of Chemical Reactions questions in NECO SSCE Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Stoichiometry of Chemical Reactions questions and exercises with answers

Showing questions 1–30 of 79.

In a chemical equation, where are the formulas of the reactants placed?Read the answer and worked solution →What are the substances generated by a chemical reaction called, and where do they appear?Read the answer and worked solution →In a balanced chemical equation, what is done with a coefficient of 1?Read the answer and worked solution →Why may the subscripts in a formula not be altered when balancing an equation?Read the answer and worked solution →Which smallest whole-number coefficients balance N2 + O2 giving dinitrogen pentoxide, N2O5?Read the answer and worked solution →In a chemical equation, what does the abbreviation aq written after a formula indicate?Read the answer and worked solution →What does an uppercase Greek delta written over a reaction arrow show?Read the answer and worked solution →What distinguishes a molecular equation from a complete ionic equation?Read the answer and worked solution →Which equation type shows every dissolved ionic reactant and product as its separate ions?Read the answer and worked solution →Aqueous CaCl2 and AgNO3 react to give solid AgCl. Which ions are the spectator ions?Read the answer and worked solution →What is a spectator ion?Read the answer and worked solution →Mixing solutions of CaCl2 and AgNO3 gives solid AgCl. What does the net ionic equation state?Read the answer and worked solution →Carbon dioxide dissolved in aqueous sodium hydroxide gives aqueous sodium carbonate and water. Which ion is the spectator?Read the answer and worked solution →Which law makes it necessary for a chemical equation to be balanced?Read the answer and worked solution →What defines a precipitation reaction?Read the answer and worked solution →Precipitation reactions between two ionic compounds in solution are also known by which name?Read the answer and worked solution →How is the solubility of a substance defined?Read the answer and worked solution →Which group of cations forms soluble compounds with no exceptions listed in the solubility guidelines?Read the answer and worked solution →Chloride, bromide and iodide salts are generally soluble. Which cations are the listed exceptions?Read the answer and worked solution →Sulfate salts are generally soluble. Which of these sulfates is an exception and therefore insoluble?Read the answer and worked solution →Hydroxide compounds are generally insoluble. Which cations are the stated exceptions?Read the answer and worked solution →Which solution would precipitate barium ions from a water sample, and what solid forms?Read the answer and worked solution →What is transferred between species during an acid-base reaction?Read the answer and worked solution →In aqueous solution, what does an acid produce?Read the answer and worked solution →Which compound is listed among the common strong acids?Read the answer and worked solution →About what fraction of acetic acid molecules are in the ionized form in water under typical conditions?Read the answer and worked solution →What is a base in aqueous solution?Read the answer and worked solution →Why are NaOH, KOH and Ba(OH)2 all classified as strong bases?Read the answer and worked solution →Ammonia dissolved in water gives NH4+ and OH- ions. How is ammonia classified, and why?Read the answer and worked solution →What are the usual products of a neutralization reaction?Read the answer and worked solution →

Worked practice questions

In a chemical equation, where are the formulas of the reactants placed?

  1. On the left side of the equation
  2. On the right side of the equation
  3. Just above the reaction arrow
  4. Just below the reaction arrow
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Correct answer: A. On the left side of the equation

1. Reactants are the substances that are used up as the reaction proceeds. 2. Their formulas are written on the left side of the equation, before the arrow. 3. The arrow points from reactants to products, so the right side is reserved for what forms. 4. Nothing is written above or below the arrow except special conditions such as heating. _Source: OpenStax Chemistry (CC BY 4.0), Ch 4 "Stoichiometry of Chemical Reactions", section 4.1 Writing and Balancing Chemical Equations_

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What are the substances generated by a chemical reaction called, and where do they appear?

  1. Reactants, written on the left
  2. Products, written on the right
  3. Coefficients, placed in front
  4. Subscripts, placed inside
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Correct answer: B. Products, written on the right

1. A chemical equation separates what goes in from what comes out using an arrow. 2. Substances generated by the change are the products. 3. Product formulas sit on the right side of the arrow. 4. Coefficients and subscripts are numbers, not substances, so neither names this group. _Source: OpenStax Chemistry (CC BY 4.0), Ch 4 "Stoichiometry of Chemical Reactions", section 4.1 Writing and Balancing Chemical Equations_

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In a balanced chemical equation, what is done with a coefficient of 1?

  1. It is written as a subscript
  2. It is placed after the formula
  3. It is normally left out entirely
  4. It is placed above the arrow
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Correct answer: C. It is normally left out entirely

1. A coefficient is the number placed immediately to the left of a formula. 2. It states how many units of that species take part. 3. A coefficient of 1 is understood, so it is normally omitted rather than written. 4. Subscripts belong inside a formula and describe the substance itself, so a coefficient never moves there. _Source: OpenStax Chemistry (CC BY 4.0), Ch 4 "Stoichiometry of Chemical Reactions", section 4.1 Writing and Balancing Chemical Equations_

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