Answer:
pure substance does not contain two or more elements
the answer is A. 22 ,because A=40 and A-z = 22
Answer:
C. 6.76 x 10^18 photons
Explanation:
First, we need to find the energy falling on 1 cm² in 1 minute. It is given to be:
Energy = E = 0.698 cal
Converting it into Joules:
E = (0.698 Cal)(4.184 J/1 Cal)
E = 2.92 J
Now, for the number pf photons, we know that this energy from sun is given by the formula:
E = nhυ
where,
h = Plank's Constant = 6.625 x 10^-34 J.s
n = number of photons
υ = frequency of wave
But,
υ = c/λ
where,
c = speed of light = 3 x 10^8 m/s
λ = wavelength = 460 nm = 460 x 10^-9 m
Therefore,
E = nhc/λ
n = Eλ/hc
n = (2.92 J)(460 x 10^-9 m)/(6.625 x 10^-34 J.s)(3 x 10^8 m/s)
<u>n = 6.76 x 10^18</u>
Answer:
The word equation is:
This reaction happens when there is the decomposition of hydrogen peroxide into oxygen and water. Thus, the equation would be
Balancing the equation requires to have the same number of atoms of each element on both the side. To balance this equation we need to add 2 water (
) molecules and 2 hydrogen peroxide (
) molecules . As we know, oxygen is naturally diatomic. Thus, the balancing equation would be:
