Explanation:
A matchstick has a lot of chemical energy stored in it. When the match is struck, it burns and the chemical energy in it produces heat energy and light energy.
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Answer:
The age of the rock is 2.23x10⁹ years.
Explanation:
The age of the rock can be calculated using the following equation:
(1)
Where:
t: is the age of the rock =?
: is the half-life of ⁴⁰K = 1.248x10⁹ years
: is the quantity of ⁴⁰K in the sample = 281.8x10⁻⁹ mol
: is the quantity of ⁴⁰Ar in the sample = 7.25x10⁻⁹ mol
10.9%: is the percent of ⁴⁰Ar production by the decay of ⁴⁰K
By entering the above values into equation (1) we have:
Therefore, the age of the rock is 2.23x10⁹ years.
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Answer:
The answer is 0.844/10 minutes
Explanation:
You have an enzyme that catalizes a reaction which gives a product that can be quantified by an absorbance measurement. The more reaction time, the more product quantity and higher absorbance.
The rate of the reaction is the change in products quantity per time unit. As you are using the absorbance as a measure of the product quantity, you can calculate the rate as the change in absorbance (ΔA) per time (in minutes) as follows:
rate= ΔA/time
rate= (final absorbance - initial absorbance) /minutes
rate= (0.444-0.022)/5 min
rate= 0.422/5 min
In 10 minutes will be :
rate= 0.844/10 min
Commonly, a rate is the relation between two quantities measured in different units. For example, the speed of a car is the change in meters (traveled distance) per time (m/s or km/h). For an enzyme, is the same (quantity of product/time).
A ball rolls down a rat a small amount of friction heats up the more the energy transformed and I’ll take it please