middle school science activities

From the previous activities one observes that all acids generate hydrogen gas on reacting with metals. Hydrogen seems to be common to all acids. In fact all acids contain hydrogen ions (H + ). A base is a substance, which on dissolving in water yields hydroxyl ions (OH - ) as the only n..

Water is an essential factor in photosynthesis. The effect of water can be understood by studying the yield of crops which is the direct result of photosynthetic activity. It is found that even slight deficiency of water results in significant reduction in the crop yield. The lack of wat..

- When the prey is active, a food cup is formed with the help of pseudopodia. ..

What do all Acids and all Bases have in Common? - From the previous activities one observes that all acids generate hydrogen gas on reacting with metals. Hydrogen seems to be common to all acids. In fact all acids contain hydrogen ions (H + ). A base is a substance, which on dissolving in..

Just behind the cornea is a dark coloured muscular diaphragm which has a small circular opening in the middle..

Sexual Transmitted Diseases - The common diseases are syphilis and gonorrhoea. Syphilis is characterized by sores around the anus, vagina, penis, lips, fingers, nipples, etc. In the later stages it results in fever and skin rashes. If untreated, it can result in insanity, heart damage or blindness...

Question: Active division takes place in the cells of ________________. 1. xylem 2. phloem 3. sclerenchyma 4. cambium Answer: ..

Detergents are surface-active agents and cause a variety of water pollution problems. Many detergents are resistant to the action of biological agents and thus are not biodegradable. Their elimination from municipal wastewaters by the usual treatments is a problem. They have a tendenc..

Question: Reabsorption of chloride ions from the glomerular filtrate in the kidney tubule is carried out by 1. Osmosis 2. Diffusion 3. Active transport 4. Brownian movement Answer: ..

Question: Why are the two non-metals, carbon and hydrogen are important chemical reference points with regard to the method of metal extraction and reactivity towards acids. Answer: The six metals K, Na, Li, Ca, Mg, and Al, which lie above carbon in the activity series, cannot ..