2Fe₂O₃ + 3C --> 4Fe + 3CO₂
(2·2)Fe → 4Fe
(2·3)O → 6O
3C → 3C
Let's go through each of the answers and think about why they work or don't work.
Chemical forms compounds.
Nuclear changes the element completely. We're going to use the sun as an example. The sun is in a state of plasma. It's really hot and has all these particles hitting into each other. The nucleus' of atoms are hitting into each other forming larger elements. It's real crazy. Nuclear is not correct.
Physical cannot form a compound.
<u>Answer:</u> The correct answer is 3500 miliseconds.
<u>Explanation:</u>
We are given a quantity of 3.5 seconds and we need to convert it into miliseconds.
To convert it into miliseconds, we will use the conversion factor:
1 second = 1000 miliseconds
Now, converting 3.5 seconds into miliseconds:
3,5 seconds = 3.5 × 1000 = 3500 miliseconds
Hence, the correct answer is 3500 miliseconds.
Like PERIODic table.). All of the elements in a period have the same number of atomic orbitals. For example, every element in the top row (the first period) has one orbital for its electrons. All of the elements in the second row (the second period) have two orbitals for their electrons.
<h3>
Answer:</h3>
4.227 × 10^-19 Joules
<h3>
Explanation:</h3>
Energy of a photon of light is calculated by the formula;
E = hf, where h is the plank's constant, 6.626 × 10^-34 J-s and f is the frequency.
But, f = c/λ
Where, c is the speed of light (2.998 × 10⁸ m/s), and λ is the wavelength.
Given the wavelength is 470 nm or 4.7 × 10^-7 m
Therefore;
E = hc/λ
= (6.626 × 10^-34 J-s × 2.998 × 10^8 m/s) ÷ 4.7 × 10^-7 m
= 4.227 × 10^-19 Joules
Therefore, the energy of a photon with 470 nm is 4.227 × 10^-19 Joules