Chemical Reactions: Endothermic, Exothermic, Combustion, Precipitation
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Questions and Answers

What is the primary characteristic of an endothermic reaction?

  • A solid product is formed
  • Heat is released
  • A substance reacts with oxygen gas
  • Heat is absorbed (correct)

Which of the following reactions is an example of combustion?

  • Burning of sugar (correct)
  • Rusting of iron
  • Melting of ice
  • Formation of magnesium and calcium oxides

What is the symbol of an element?

  • A single letter that represents an element
  • One of two letters that represent an element (correct)
  • The atomic number of an element
  • The atomic mass of an element

What is the atomic number of an element?

<p>The number of protons and electrons present in the element (A)</p> Signup and view all the answers

How is the number of neutrons in an element calculated?

<p>Atomic mass - atomic number (C)</p> Signup and view all the answers

What is the role of the independent variable in an experiment?

<p>The variable that is changed by the person executing the experiment (B)</p> Signup and view all the answers

What is the dependent variable in an experiment?

<p>The variable that is affected by the independent variable (A)</p> Signup and view all the answers

What is the characteristic of an exothermic reaction?

<p>Heat is released (D)</p> Signup and view all the answers

What is the result of a precipitation reaction?

<p>A solid product is formed (C)</p> Signup and view all the answers

What is the opposite of combustion?

<p>Endothermic Reaction (A)</p> Signup and view all the answers

What is the purpose of an independent variable in an experiment?

<p>To be changed (A)</p> Signup and view all the answers

What is the atomic mass of an element with 20 protons and 30 neutrons?

<p>40 (D)</p> Signup and view all the answers

Which of the following reactions is an example of endothermic reaction?

<p>Melting of ice (B)</p> Signup and view all the answers

What is the number of electrons/protons in an element with an atomic number of 8?

<p>8 (A)</p> Signup and view all the answers

What type of reaction involves oxygen gas and releases energy in the form of light or gas?

<p>Combustion (A)</p> Signup and view all the answers

What is the atomic mass of an element with an atomic number of 12 and 10 neutrons?

<p>22 (D)</p> Signup and view all the answers

What is the result of a combustion reaction?

<p>Release of energy (A)</p> Signup and view all the answers

What is the dependent variable affected by in an experiment?

<p>The independent variable (B)</p> Signup and view all the answers

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