Nature of Matter Elements Compounds and Mixtures Class 8 Short Question Answer
hardNature of Matter Elements Compounds and Mixtures Class 8 Short Question Answer
Nature of Matter Elements Compounds and Mixtures Class 8 Short Question Answer
Question 1.
What is the difference between an element and a compound?
Answer:
An element is a pure substance that cannot be broken down into simpler substances, while a compound is a substance formed when two or more elements chemically combine in a fixed ratio.
Question 2.
How can mixtures be classified based on their uniformity?
Answer:
Mixtures can be classified as homogeneous (uniform composition) or heterogeneous (non-uniform composition), depending on whether the individual components are easily distinguishable.
Question 3.
What is a pure substance?
Answer:
A pure substance consists of only one type of particle and has a consistent composition and properties throughout.
Question 4.
Give an example of a compound formed from non-metals.
Answer:
An example of a compound formed from non-metals is carbon dioxide (CO2), which consists of carbon and oxygen.
Question 5.
Why does water have different properties compared to its constituent elements, hydrogen and oxygen?
Answer:
Water (H2O) has different properties than hydrogen and oxygen because it is a compound formed from these elements, resulting in new chemical and physical characteristics that are not present in the individual elements.
Question 6.
How can mixtures be classified, and what distinguishes a homogeneous mixture from a heterogeneous mixture?
Answer:
Mixtures can be classified as homogeneous or heterogeneous based on their composition. A homogeneous mixture has a uniform composition throughout, such as saltwater, while a heterogeneous mixture contains visibly different substances or phases, like salad or muddy water.
Question 7.
Why is water classified as a compound rather than a mixture?
Answer:
Water is classified as a compound because it is formed from the chemical combination of hydrogen and oxygen in a fixed ratio of 2:1, resulting in unique properties that differ from those of its constituent elements. Unlike a mixture, the components of water cannot be separated by physical means.