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Yogita Ingle 4 years, 2 months ago
It should be cleaned before burning due to the following reasons:
- Magnesium very reactive element which rapidly reacts with oxygen in the air to form a white layer of magnesium oxide and this layer will not burn.
- To remove the Magnesium oxide layer from the ribbon which may prevent or slow down the burning of
- magnesium ribbon.
- Unwanted impurities deposited on the magnesium ribbon can be removed and only pure magnesium can be used for the reaction.
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Virajit Singh 4 years, 2 months ago
Yogita Ingle 4 years, 3 months ago
Physical Properties of Bases
- Bases taste bitter – There are very few food materials that are alkaline. It is even more important that care be taken in tasting bases. Tasting of bases is more dangerous than tasting acids because of the property of stronger bases to denturate protein.
- Bases release a hydroxide ion in water solution.
- Bases neutralise acids in a neutralization reaction – The word reaction means that an acid plus a base makes water plus a salt. Symbolically where “Y” is the anion of acid “HY”. ‘X’ is the cation of base ‘XOH’ and ‘XY” is the salt in the product, the reaction is
HY + XOH → HOH + XY
- Bases denature protein – This accounts for the slippery feeling on the hands when exposed to a base. Strong bases that dissolve in water well, such as sodium or potassium lye, are very dangerous because a great amount of the structural material of human beings is made of protein. Serious damage to flesh can be avoided by careful use of strong bases.
- Bases turn red litmus to blue – This is not to say that litmus is the only acid base indicator, but that it is likely the oldest one.
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Yogita Ingle 4 years, 3 months ago
Electronic configuration of an element gives the information of valence electrons and number of shell present in the element. We get the information of group number after knowing valence electrons.
The number of shells present in an element is equal to the period number. Thus, by knowing electronic configuration we know the group number and period number of an element, and the position of an element in the periodic table.
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Principle Axis: The straight line passing through the pole P and the centre of curvature C of the mirror, is called principal axis of the mirror.
Normal: The normal at any point of the spherical mirror is the straight line obtained by joining that point with the centre of the mirror.
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यदि हम हामिद के स्थान पर होते और मेले में जाते तो अपने तीन पैसों में कोई ऐसी वस्तु खरीदते जो उपयोगी होती। हामिद ने चिमटा खरीदा था। हम भी ऐसी ही वस्तु खरीदते। वह कोई कॉपी या कलम भी हो सकती थी। हामिद ने अपने पैसों का सही प्रयोग किया था। हम भी ऐसा ही करते ।
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Mohd Salman 1 year, 7 months ago
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Yogita Ingle 4 years, 4 months ago
Lencho was a farmer. He writes a letter to God when his crops were ruined.
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