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Dec 05, 2019 · Selina Concise ICSE Solutions for Class 7 Chemistry Chapter 3 Elements, Compounds and Mixtures. Points to Remember : Every substance is made up of very tiny particles, called molecules. Molecules are formed from even smaller particles called atoms. Element— (a) Element is the simplest pure substance. It cannot be divided further into simpler ... 2019 polaris rzr turbo recall
Oct 10, 2016 · an element is a pure substance, you cant break it down any further than it already is. They are found on the periodic table and make up everything in the universe. compounds are made of 2 or more different elements, such as table salt, which is made of Chlorine and Sodium. heterogeneous means diverse or different. homogeneous means uniform and similar.

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Feb 02, 2017 · Elements and molecules are considered to be pure substances. They consist of only one component; hence, their physical and chemical properties are constant. Pure substances are of one phase and do not separate into two or more phases at a given temperature or pressure. They can be gas, liquid or solid.

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The chemical or pure substance definition is clear, all elements are pure substances. This is because they have no impurities and are not combined yet to other elements or compounds. A compound on the other hand is a combination of 2 or more elements.

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A pure substance has a definite and constant composition — like salt or sugar. A pure substance can be either an element or a compound, but the composition of a pure substance doesn’t vary. Elements. An element is composed of a single kind of atom. An atom is the smallest particle of an element that still has all the properties of the element.

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Compounds. compound - pure substance composed of two or more elements that are chemically combined. made of elements in a specific ratio that is always the same. have a chemical formula. can only be separated by . chemical meansonly (NOT physically)

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Note that an element: consists of only one kind of atom, cannot be broken down into a simpler type of matter by either physical or chemical means, and; can exist as either atoms (e.g. argon) or molecules (e.g., nitrogen). A molecule consists of two or more atoms of the same element, or different elements, that are chemically bound together ...

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Using elements, compounds or both, create a homogeneous mixture and a heterogeneous mixture and explain your reasoning for each. Air that you breathe is a mixture of gases, by volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% Ar or argon, 0.039% CO2 or carbon dioxide, and variable amount of water vapor, on average around 0.4% over ...

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Melting Point and Freezing Point. Pure, crystalline solids have a characteristic melting point, the temperature at which the solid melts to become a liquid.The transition between the solid and the liquid is so sharp for small samples of a pure substance that melting points can be measured to 0.1 o C.

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Nov 29, 2012 · a)Separating a homogeneous mixture into pure substances. b)Separating a heterogeneous mixture into pure substances. c)Distilling a saltwater mixture. d)Breaking a compound into its constituent elements. At least two of the above (a-d) require chemical methods

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4. Compounds have fixed properties. For example, a particular compound will have fixed temperatures at which it melts and boils. 5. A compound can have properties different from its constituents, as a new substance is formed when the constituents are chemically combined. 6. The constituents of a compound can be separated only by chemical methods.

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Aug 20, 2019 · Pure substances are made of only one type of atom. At least two types of atoms are required to make a compound. At least two types of atoms are required to make a molecule. Mixtures can be made of two elements, two compounds or an element and a compound.

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