To wire your stereo equipment, you need 325 centimeters (cm) of speaker wire tha
ID: 516776 • Letter: T
Question
To wire your stereo equipment, you need 325 centimeters (cm) of speaker wire that sells for $0.15/ft. What is the price of the wire? Convert 325 cm to inches Convert inches to feet Calculate the price 3. The scenes below represent an atomic-scale view of substance A undergoing two different changes. Decide whether each scene physical or a chemical change. From A to B, what change has happened? From A to C, what change has happened? Decide whether each of the following processes is primarily a physical or a chemical change, and explain briefly: (a) Frost forms as the temperature drops on a humid winter night. (b) A cornstalk grows from a seed that is watered and fertilized. (c) A match ignites to form ash and a mixture of gases. (d) Perspiration evaporates when you relax after Jogging. (e) A silver fork tarnishes slowly in air.Explanation / Answer
2) 1 cm = 0.3937 inch
So, 325 cm = 128 inch = 10.67 ft as 12 inch = 1 feet
Price = 10.67*0.15 = 1.6$
3) A to B is a Chemical change as structure is changing. A to C is physical change as only arrangement is changing.
4) (a) Frost forming is a physical change as water vapors are just condensing to form frost and we can have vapors back if we heat the frost.
(b) It is a chemical change since a seed is changing its chemical composition to grow into a cornstalk.
(c) It ia chemical change as match is burning means reacting with ambient oxygen to form flame i.e. heat and other gases.
(d) It is a physical change as prespiration is nothing but the sweat i.e. water that is being evaporated there by cooling the body.
(e) It is a chemical change as Silver is raction with air to form a layer of tarnishes.
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