Fill in the blanks :
1) ______ are the building blocks of every matter.
2) A _______ is made of same or different kinds of atoms.
3) The gas can be converted into liquid state by increasing the _______.
4) The freezing point of water is _____.
5) Condensation of water is a ______ change.
6) _______ is used to separate solid-solid complex mixtures.
7) Elements are represented by their ______.
8) Pure water is a ______.
9) Mixture is an ______ substance.
10) The constituents of a compound are present in _____ proportion.
Answers
Answer:
2. Matter 3. Temperature 4. 0Liquid
1 The basic building blocks that make up matter are called atoms.
2 Elements
3 On increasing pressure the volume of the gas decreases which brings gaseous molecules together and decreases the space between them and on decreasing the temperature the kinetic energy of the molecules decreases and forces of attraction between them increases and thus, gas can be converted into liquid.
4 0 °C
5 physical
6 chromatography
7 In the typical periodic table, each element is listed by its element symbol and atomic number.
8 Water is a compound of hydrogen and oxygen. Water is a pure substance and not a mixture.
9 A mixture is a substance made by combining two or more different materials in such a way that no chemical reaction occurs. A mixture can usually be separated back into its original components. Some examples of mixtures are a tossed salad, salt water and a mixed bag of M&M's candy.
10 A compound is a substance formed when two or more chemical elements are chemically bonded together. Two types of chemical bonds common in compounds are covalent and ionic bonds. The elements combine together in fixed ratio e.g. in water, hydrogen and oxygen elements are present in the ratio of 2:1.
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