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UAE MoE Grade 10 Chemical Reactions — practice questions

Explore 30 free Chemical Reactions questions in UAE MoE Grade 10 Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Chemical Reactions questions and exercises with answers

Showing questions 1–30 of 30.

The number written to the left of a formula in a chemical equation is called a:Read the answer and worked solution →An equation with equal numbers of each element on both sides is described as:Read the answer and worked solution →A chemist writes a coefficient of one in front of a formula. Convention says this should be:Read the answer and worked solution →A balanced equation ends up with coefficients 2, 4 and 6. Convention asks for the smallest whole:Read the answer and worked solution →The maximum concentration of a substance that can dissolve in a solvent is its:Read the answer and worked solution →Mixing solutions of lead nitrate and potassium iodide gives a solid because the insoluble product is lead:Read the answer and worked solution →Virtually every HCl molecule reacts when dissolved in water, so HCl is classed as a strong:Read the answer and worked solution →A substance that dissolves in water to yield hydroxide ions is defined as a:Read the answer and worked solution →Sodium hydroxide in water separates into hydroxide ions and ions of:Read the answer and worked solution →Sodium loses electrons to chlorine during their reaction, so sodium has been:Read the answer and worked solution →Because sodium supplies those electrons to chlorine, sodium acts as the:Read the answer and worked solution →The oxidation number of an atom in an elemental substance such as pure oxygen gas is:Read the answer and worked solution →The oxidation number of a monatomic ion is equal to that ion's:Read the answer and worked solution →Hydrogen combined with a nonmetal is normally assigned an oxidation number of:Read the answer and worked solution →Oxygen in most of its compounds is assigned an oxidation number of:Read the answer and worked solution →The oxidation numbers of every atom in a neutral molecule must add up to:Read the answer and worked solution →A balanced equation makes ammonia from hydrogen in a 2 to 3 ratio. Such a ratio is called a stoichiometric:Read the answer and worked solution →Two reactants are mixed in a non-stoichiometric ratio. The one consumed entirely is the:Read the answer and worked solution →Silicon yields less product than nitrogen does in a given mixture, so silicon is the:Read the answer and worked solution →The amount of product predicted by the balanced equation under given conditions is the:Read the answer and worked solution →Percent yield compares actual with theoretical yield, and the units cancel provided they are:Read the answer and worked solution →Measuring the strength of vinegar by adding measured base from a buret is an example of:Read the answer and worked solution →Catch the equation wordsRead the answer and worked solution →Pop the redox wordsRead the answer and worked solution →Run the reaction gatesRead the answer and worked solution →Slice the chemistry wordsRead the answer and worked solution →Oxidised or reducedRead the answer and worked solution →Sort the chemistry wordsRead the answer and worked solution →Type the numberRead the answer and worked solution →Chemistry bingoRead the answer and worked solution →

Worked practice questions

The number written to the left of a formula in a chemical equation is called a:

  1. Coefficient
  2. Coordinate
  3. Compression
  4. Combination
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Correct answer: A. Coefficient

1. It tells how many units of that species take part. 2. It sits immediately before the chemical formula. 3. That number is a coefficient. _Source: OpenStax Chemistry 2e, Chapter 4, Stoichiometry of Chemical Reactions._

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An equation with equal numbers of each element on both sides is described as:

  1. Buffered
  2. Balanced
  3. Bonded
  4. Boiled
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Correct answer: B. Balanced

1. Atoms are neither created nor destroyed in a reaction. 2. So each element must be counted equally on both sides. 3. Such an equation is balanced. _Source: OpenStax Chemistry 2e, Chapter 4, Stoichiometry of Chemical Reactions._

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A chemist writes a coefficient of one in front of a formula. Convention says this should be:

  1. Omitted
  2. Doubled
  3. Circled
  4. Bracketed
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Correct answer: A. Omitted

1. One unit is what a bare formula already means. 2. Writing the digit adds nothing to the meaning. 3. So a coefficient of one is omitted. _Source: OpenStax Chemistry 2e, Chapter 4, Stoichiometry of Chemical Reactions._

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More Chemistry topics

ChemistryStoichiometry