Chemical Reactions and Equations Activity 1.1

Milk left at room temperature during summers undergoes a chemical reaction.

A chemical change results in the formation of new substances, while a physical change only alters the appearance or form of a substance.

The nature and the identity of the initial substance change.

<p>A chemical reaction is a process that leads to the formation of new substances with different chemical properties from the original substances.</p> Signup and view all the answers

<p>The experiment requires teacher's assistance and proper eye protection, as burning magnesium ribbon emits bright light.</p> Signup and view all the answers

<p>A clean magnesium ribbon is burned with a spirit lamp or burner, and the ash formed is collected in a watch glass.</p> Signup and view all the answers

<p>Cleaning the ribbon with sandpaper removes any oxide layer on the surface, ensuring a clean and efficient burning reaction.</p> Signup and view all the answers

<p>The ash, magnesium oxide, represents a new substance formed due to a chemical reaction between magnesium and oxygen.</p> Signup and view all the answers

<p>The occurrence of a chemical reaction can be identified by observing changes in the nature and identity of the initial substance.</p> Signup and view all the answers

<p>Understanding chemical reactions helps us comprehend various natural phenomena and technological processes, enabling us to control and utilize chemical reactions to our benefit.</p> Signup and view all the answers

<p>Cleaning the magnesium ribbon with sandpaper removes any oxide layer that might have formed on its surface. This ensures a clean and reactive surface for burning, allowing for a more visible and accurate observation of the chemical reaction.</p> Signup and view all the answers

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

<p>Burning magnesium produces a very bright light that can be harmful to the eyes. The eyeglasses protect the eyes from this intense light.</p> Signup and view all the answers

<p>The magnesium ribbon glows brightly and changes from a solid silvery ribbon into a white powdery ash.</p> Signup and view all the answers

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

<p>Magnesium oxide</p> Signup and view all the answers

<p>It indicates that a chemical change has occurred, and a new substance has been formed.</p> Signup and view all the answers

<p>To prevent contamination and make it easier to analyze the product of the reaction.</p> Signup and view all the answers

<p>Rusting of iron is an analogous reaction where a metal changes its appearance and forms a new compound.</p> Signup and view all the answers

<p>A physical change is a change in the form or appearance of a substance but not its chemical composition, like melting ice. A chemical change results in the formation of a new substance with different properties, as seen in the changing magnesium into magnesium oxide.</p> Signup and view all the answers

A process where substances change to form new substances.

A change that does not alter the substance's identity.

A change that results in the formation of new chemical substances.

A thin strip of magnesium used to demonstrate chemical reactions.

A white powder formed when magnesium burns in oxygen.

A chemical process where a substance reacts with oxygen to produce heat and light.

Noticing changes during a chemical reaction, like color change or gas production.

Safety measures taken while conducting chemical reactions.

A demonstration of combustion by burning magnesium to create magnesium oxide.

Common occurrences, like cooking or rusting, showing chemistry in life.

Common situations where chemical changes occur, like fermentation and respiration.

A product formed when magnesium burns in oxygen, resulting in ash.

A demonstration of combustion producing light and heat, changing magnesium to oxide.

Signs that a chemical reaction has occurred, such as color change or gas release.

Exposing iron to humidity can cause it to rust, a type of chemical change.

A chemical change in which sugars are converted into alcohol or acids by microorganisms.

Changing ingredients into new flavors and textures through heat application.

A biochemical process where glucose is converted to energy, releasing carbon dioxide.

The practice of noting changes through experiments to understand reactions better.