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Harrizon [31]
3 years ago
15

Please help

Chemistry
1 answer:
ki77a [65]3 years ago
7 0

Answer:

Ruthenium or Dubnium

Explanation:

<em>Ruthenium</em> after Ruthenia or <em>Dubnium</em> after Dubna, a place in Russia

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The electrons in the outer shell of an atom are called:<br> outer<br> ionized<br> polar<br> valence
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Valence.

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Valence electrons determine whether the an element is ready form compounds. These electrons can be gained, lost, or shared in the formation of compounds.
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Which of the following statements is true about rain falling from clouds?*
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Answer:

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Which of the following is an example of an experimental scientific investigation
sleet_krkn [62]

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7 0
3 years ago
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How many liters of oxygen gas, at standard temperature and pressure, will react with 35.4 grams of calcium metal? Show all of th
Margaret [11]
Answer: 19.8 l


Explanation:

1) Chemical equation:

2Ca + O₂ → 2CaO


2) Mole ratios: 2 mol Ca : 1 mol O₂ : 2 mol CaO

3) Convert 35.4 g of Ca to moles:

n = mass in grams / molar mass = 35.4 g / 40.1 g/mol = 0.883 mol

4) Volume proportion: 1 mol of gas at STP = 22.4 l


1 mol at STP              0.883 mol at STP

--------------------- = ------------------------------

22.4 l                                      x

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3 years ago
What are Metals that are less reactive than alkali metals and alkaline-earth metals called
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4 0
2 years ago
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