plz ans my worksheet of sci.....
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6 salt is a mixture of acid and base. for example NaCl,kCl.
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1-)Atoms are positively charged when they share their electrons.
2-)Atoms are negatively charged when they gain some electrons.
3-) Atoms are electrically neutral because they consists of equal number of positively charged protons and negatively charged electrons which cancel eachother to make atoms neutral.
4-)Acids are those chemical substances which give hydrogen ions when dissolve in water.for example: HCL,HNO3 etc.
5-) Metallic oxides and hydroxides are called base. for example: NaOH, KOH etc.
6-)Salt is a chemical substance which is formed by partial or complete replacement of hydrogen ion of an acid molecule by a metal or ammonium radical. for example: Nacl.
7-)A solid is a sample of matter that retains its shape and density when not confined.
8-) A liquid is a nearly incompressible fluid that conforms to the shape of its container but retains a (nearly) constant volume independend of pressure. It is the only state with a definite volume but no fixed shape.
9-)A gas is a sample of matter that conforms to the shape of a container in which it is held and acquires a uniform density inside the container, even in the presence of gravity and regardless of the amount of substance in the container.If not confined to a container, gaseous matter, also known as vapour , will disperse into space .The term gas is also used in reference to the state or condition of matter having this property.
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2-)Atoms are negatively charged when they gain some electrons.
3-) Atoms are electrically neutral because they consists of equal number of positively charged protons and negatively charged electrons which cancel eachother to make atoms neutral.
4-)Acids are those chemical substances which give hydrogen ions when dissolve in water.for example: HCL,HNO3 etc.
5-) Metallic oxides and hydroxides are called base. for example: NaOH, KOH etc.
6-)Salt is a chemical substance which is formed by partial or complete replacement of hydrogen ion of an acid molecule by a metal or ammonium radical. for example: Nacl.
7-)A solid is a sample of matter that retains its shape and density when not confined.
8-) A liquid is a nearly incompressible fluid that conforms to the shape of its container but retains a (nearly) constant volume independend of pressure. It is the only state with a definite volume but no fixed shape.
9-)A gas is a sample of matter that conforms to the shape of a container in which it is held and acquires a uniform density inside the container, even in the presence of gravity and regardless of the amount of substance in the container.If not confined to a container, gaseous matter, also known as vapour , will disperse into space .The term gas is also used in reference to the state or condition of matter having this property.
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10-) A fluid is any substance that flows or deforms under applied shear stress.
12-)A solute is a substance dissolved in another substance. for example: milk and sugar.
13-)A solvent is a liquid that dissolves a solid, liquid, or gaseous solute. for example: water , milk, acetone etc.
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