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Nadusha1986 [10]
3 years ago
8

Explain how scientific observations led to the development of, and changes to, the periodic table.

Chemistry
1 answer:
Vesna [10]3 years ago
7 0
By the observations made by scientists on the properties of the elements that is found in the periodic table, these elements are arranged accordingly depending on their properties. The rows are called as the periods while columns are known as groups. In the case of the size of the atom, they are arranged in a way that from left to right across a period the atomic radius increases as well as going down a group. For reactivity, it increases from left to right and up to down. Also, the elements are arranged with respect to increasing atomic number. It is Dmitri Mendeleev that is one of the chemist  who arranged the periodic table which has been used up to till now.
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True

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Which distinguishes chemical changes from physical changes?
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2 years ago
A plant release it’s seed , but soon there after, the area seeds are in experiences a yearlong drought. How would the seeds most
SOVA2 [1]

Answer:

Plants will absorb water through their roots and release water as vapor into the air through these stomata. To survive in drought conditions, plants need to decrease transpiration to limit their water loss. Some plants that live in dry conditions have evolved to have smaller leaves and therefore fewer stomata.

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6 0
3 years ago
The decomposition of carbon disulfide to carbon monosulfide and sulfur is first order with k=2.8 ×10^-7 at 1000°C .What is the h
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2.5×10⁶ s

Explanation:

From the question given above, the following data were obtained:

Rate constant (K) = 2.8×10¯⁷ s¯¹

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The half-life of a first order reaction is given by:

Half-life (t½) = 0.693 / Rate constant (K)

t½ = 0.693 / K

With the above formula, we can obtain the half-life of the reaction as follow:

Rate constant (K) = 2.8×10¯⁷ s¯¹

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t½ = 2.5×10⁶ s

Therefore, the half-life of the reaction is 2.5×10⁶ s

6 0
2 years ago
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