Gr 8 Natural Sciences Ch 2.3: How do we know a chemical reaction has taken place?

<p>The presence of bubbles</p> Signup and view all the answers

<p>Precipitate</p> Signup and view all the answers

<p>By smelling new substances with distinct smells</p> Signup and view all the answers

<p>A reaction between acid and base</p> Signup and view all the answers

<p>A reaction that produces fizzing or explosions</p> Signup and view all the answers

<p>Release of carbon dioxide gas</p> Signup and view all the answers

<p>To react with the calcium carbonate in the eggshell</p> Signup and view all the answers

<p>They break their bonds and form new bonds</p> Signup and view all the answers

<p>Calcium acetate and carbon dioxide gas</p> Signup and view all the answers

<p>The eggshell dissolves</p> Signup and view all the answers

<p>To hold the egg</p> Signup and view all the answers

<p>Formation of a solid</p> Signup and view all the answers

<p>To contain the reactants and products</p> Signup and view all the answers

<p>The reaction between hydrochloric acid and sodium hydroxide</p> Signup and view all the answers

<p>Exothermic</p> Signup and view all the answers

<p>Taste</p> Signup and view all the answers

<p>A change in the hue of the colour</p> Signup and view all the answers

<p>Chemical reaction</p> Signup and view all the answers

<p>The formation of a precipitate</p> Signup and view all the answers

<p>It is a byproduct of the reaction that helps to dissolve the eggshell.</p> Signup and view all the answers

<p>To ensure the eggshell is completely dissolved.</p> Signup and view all the answers

<p>They are a sign of gas formation, specifically carbon dioxide.</p> Signup and view all the answers

<p>The creation of substances with different properties from the original reactants.</p> Signup and view all the answers

<p>It is a reactant that reacts with the acetic acid.</p> Signup and view all the answers

<p>All of the above.</p> Signup and view all the answers

<p>Nuclear Reaction</p> Signup and view all the answers

<p>The release or absorption of heat</p> Signup and view all the answers

<p>Smell</p> Signup and view all the answers

<p>To measure the rate of reaction</p> Signup and view all the answers

<p>Rusting of iron</p> Signup and view all the answers

<p>Reaction Vessel</p> Signup and view all the answers

<p>Dissolution of a solid</p> Signup and view all the answers

<p>Products</p> Signup and view all the answers

<p>The increase in pressure from the accumulation of carbon dioxide gas</p> Signup and view all the answers

<p>A neutralization reaction that yields calcium acetate and water</p> Signup and view all the answers

<p>To allow for the complete dissolution of the eggshell</p> Signup and view all the answers

<p>To protect the egg from the acidic environment</p> Signup and view all the answers

<p>To form a precipitate with the eggshell</p> Signup and view all the answers

<p>A change in the chemical properties of the reactants</p> Signup and view all the answers

<p>The presence of bubbles in the reaction flask</p> Signup and view all the answers

<p>Sight</p> Signup and view all the answers

<p>To observe changes in the properties of the substances involved</p> Signup and view all the answers

<p>Chemical Reaction</p> Signup and view all the answers

<p>A change in the shape of the reactants</p> Signup and view all the answers

<p>The vinegar reacts with the calcium carbonate in the eggshell.</p> Signup and view all the answers

<p>It is one of the products of the reaction.</p> Signup and view all the answers

<p>The formation of new substances with different chemical properties.</p> Signup and view all the answers

<p>To allow sufficient time for the reaction to occur and the shell to dissolve.</p> Signup and view all the answers

<p>It is a sign of gas formation during the reaction.</p> Signup and view all the answers