Yes, Chemical reactions occur slower at lower temperatures and faster at higher temperatures. When you put a glow stick in cold water, the chemical reaction slows down but will last for a longer period of time. When you put a glow stick in hot water, the reaction speeds up but will be over quicker.
Not sure about the variable one though, sorry!
Answer: False
Explanation:
The teeth of mammals do not have the similar function to perform. They have different types, number and sizes of teeth that are equipped to perform different functions.
Example: Human beings have incisors,canines, molar and premolar. The incisors are used to cut the food and hold the food.
The canines are use to tear hard food such as meat. The molars and premolars are used to grind the food.
Hence, the given statement is false.
The question is simply asking for the volumetric flow rate of the water in the river. It<span> is the volume of fluid which passes per unit time. It has units of m^3 /s. We calculate as follows:
Q = 750 m^2 (4 m/s ) = 3000 m^3/s
Hope this answers the question. Have a nice day.</span>
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