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Marat540 [252]
3 years ago
8

Which of the below elements are part of a group? Feel free to use the periodic table.

Chemistry
2 answers:
LUCKY_DIMON [66]3 years ago
5 0

Answer:

B. Be, Mg, Ca, Sr

Explanation:

Be, Mg, Ca, Sr are parts of the alkaline Earth metal family/group. So they are the second most reactive elements following behind alkali metals. Furthermore, Be, Mg, Ca, Sr all have 2 valence electrons that lose them to form cations. They have low melting points, low boiling points, can conduct electricity, have high malleability and ductility.

Hope it helped!

gogolik [260]3 years ago
4 0
B. Be, Mg, Ca, Sr (hope this helps)
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<h3>What is an experiment?</h3>

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<h3>What causes different results in similar experiments?</h3>

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3 years ago
What is kinetic energy of a 155 kg object moving at speed of 20 m/s
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The decomposition of NI3 to form N2 and I2 releases −290.0 kJ of energy. The reaction can be represented as 2NI3(s)→N2(g)+3I2(g)
EastWind [94]

Answer:

-7.34 kilo Joules is the change in enthaply when 20.0 grams of nitrogen triiodide decomposes.

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According to reaction, 2 moles of nitrogen triiodide gives 290.0 kilo Joules of heat on decomposition ,then 0.05063 moles of nitrogen triiodide will give :

\frac{-290.0 kJ}{2}\times 0.05063=-7.34 kJ

-7.34 kilo Joules is the change in enthaply when 20.0 grams of nitrogen triiodide decomposes.

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3 years ago
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