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irga5000 [103]
3 years ago
5

How many electrons are contained in an electrically neutral atom of element number 44? 22 44 121 88

Chemistry
2 answers:
ElenaW [278]3 years ago
8 0
44, because the atomic number shows how many electrons are in the neutral atom
Anika [276]3 years ago
6 0
In an electrically neutral Atom of element number 44, or atomic number 44, there would be also 44 electrons, as the net charge of the subatomic particles, protons and electrons would be zero.
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During an experiment a thermometer was placed in a beaker containing hydrogen peroxide. The following observations were recorded
wlad13 [49]

The states of matter change to produce the same or the new substance. When yeast is added to hydrogen peroxide bubble of carbon dioxide is formed which indicates chemical change.

<h3>What is a chemical change?</h3>

A chemical change is the formation of a new substance by the chemical alterations in the reactants. The yeast releases products of cellular respiration that react with hydrogen peroxide.

The reaction is exothermic as it releases heat and increases the temperature when measured by the thermometer. The Fizzing and bubbling occur when carbon dioxide reacts with H₂O₂ to produce a new substance.

Therefore, addition of yeast to hydrogen peroxide is a chemical change.

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6 0
2 years ago
(50 POINTS) HELPPP
Debora [2.8K]
The answer is D, Magnesium.

For an anion or cation(negatively or positively charged ion) to replace a similarly-charged ion, it needs to be more active.  This means that only a cation that is above Zinc on the reactivity scale can replace Zinc.

Since Aluminum was displaced in the reaction, that means the unknown metal is more reactive.  
This means that our options are:
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But because the metal did not displace the Sodium, it must be less reactive than it.
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Magnesium, Aluminum, Zinc, Iron, Nickel, etc.

The only metal on both lists is Magnesium, and that means that your answer is D, Magnesium.
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