CognitoQuiz

Acids The chemicals causing sourness of substance, is called acids .  These are not soapy to touch.  These turn blue litmus into red.  Example- Acetic acid(chemical in vinegar)  Bases The chemicals causing bitterness of substance, is called bases .  These are soapy to touch.  These turn red litmus into blue.  Example- baking soda, calcium hydroxide etc.  Indicator The substance used to test whether a substance is acidic or basic, are called indicator.  Example- Turmeric, litmus, china rose petals, phenolphthalein etc.  Litmus:A natural dye It is a natural indicator.  It is extracted from lichen.  When added to acid, it turns red.  When added to base, it turns blue.  Available in- Solution form, Paper strips Neutral solution The solution which donot change the colour of either red or blue litmus, is known as neutral solution.  Example- Sugar solution, water etc.  China rose as indicator China rose indicator t...

Heat Energy that increases hotness of an object.  Temperature A reliable measure of the hotness of an object, is its temperature .  Thermometer A device used to measure temperature, is called thermometer .  Types of thermometer (i) Clinical thermometer (ii) Laboratory thermometer (iii) Maximum-minimum thermometer Clinical thermometer -The thermometer used to measure temperature of body, is called clinical thermometer.  -It consists of- glass tube,                           Bulb                           Mercury thread                           Kink -Range- 35°C to 42°C. -It has kink.  Clinical thermometer Laboratory thermometer -The thermometer used to measure temperature of an object, is c...