Ab aap Whatsapp pe solutions paa saktey h, hum aapko ping karenge. Study Materials. Why use Doubtnut? Instant Video Solutions. Request OTP. Updated On: Share This Video Whatsapp. Text Solution. Solution :. Ordinary table salt is called sodium chloride.
It is considered a substance because it has a uniform and definite composition. All samples of sodium chloride are chemically identical. Water is also a pure substance. Salt easily dissolves in water, but salt water cannot be classified as a substance because its composition can vary. You may dissolve a small amount of salt or a large amount into a given amount of water. A mixture is a physical blend of two or more components, each of which retains its own identity and properties in the mixture.
Only the form of the salt is changed when it is dissolved into water. It retains its composition and properties. A phase is any part of a sample that has a uniform composition and properties.
By definition, a pure substance or a homogeneous mixture consists of a single phase. A heterogeneous mixture consists of two or more phases. When oil and water are combined, they do not mix evenly, but instead form two separate layers. Each of the layers is called a phase.
Identify each substance as a compound, an element, a heterogeneous mixture, or a homogeneous mixture solution. Matter can be classified into two broad categories: pure substances and mixtures. A pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample. Mixtures can be classified as homogeneous or heterogeneous. Elements and compounds are both examples of pure substances. Compounds are substances that are made up of more than one type of atom.
Elements are the simplest substances made up of only one type of atom. Chem1 Virtual Textbook. Pure Substances When we speak of a pure substance , we are speaking of something that contains only one kind of matter.
Students will differentiate elemental substances and compounds. This activity is about classification of matter into pure substances and mixtures. It provides background information for the interactive activity below. Among other things, students learn that solutions are not always liquid: homogeneous mixtures can also take gaseous or solid forms. In the case of a solid solution, like a metal alloy, the different chemicals typically become mixed in the liquid phase and later harden into a solid.
In this diagram, more specific categories are nested inside of more general ones. Paraphrase :. Pretty much all the materials around us, and even in us, fit into one of two categories:. Within pure substances category there are:. Within the mixture category there are:. To practice classifying various familiar objects, we will play a Turn and Talk sorting game during which all teams will be shown an object. Then your team will discuss which of the categories corresponds to the object.
Teachers can choose whether or not to keep score. Answers :. Students drag the labels to their correct positions on the diagram using the words at the top of this page.
Answers shown on the right. This project was supported by Science Sandbox, a Simons Foundation initiative dedicated to engaging everyone with the process of science.
SciGen Teacher Dashboard. Science Thinking. Models in Science. Designing a Fair Test. Exploring a Hypothesis. Investigating a Question. Units of Measure. Measuring Up Metric. The Power of Per.
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