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NECO SSCE Chemistry — practice by topic

Browse 107 questions across 2 Chemistry topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Chemistry topics

Stoichiometry of Chemical Reactions (79)Thermochemistry (28)

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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 →

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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