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Anna35 [415]
3 years ago
15

Could you please help

Chemistry
1 answer:
Semenov [28]3 years ago
8 0
I would say D, because you need to start with nothing to measure the different sizes as they start to grow. hope this helps!
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Which type of change must occur to form a compound? (1) chemical (3) nuclear(2) physical (4) phase?
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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. 

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Answer:

When the excited electron fall back to the lower energy levels the energy is released in the form of radiations.The characteristics bright colors are due to the these emitted radiations. These emitted radiations can be seen if they are fall in the visible region of spectrum

Explanation:

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