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sertanlavr [38]
3 years ago
7

I just need help with these 2 questions I accidentally answered the first one

Chemistry
1 answer:
Anni [7]3 years ago
7 0

Answer:

i think the pool

Explanation:

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Which of the following has the electron configuration [ar] 4s23d5 ?
nignag [31]

Answer:

Mn Manganese

Explanation:

5 0
3 years ago
In naming the compound PCl5, the prefix used with the second element is ____________________.
Oksanka [162]

Answer:

\boxed {\boxed {\sf Hepta}}

Explanation:

We are given the formula:

PCl_5

This is a molecular formula, because it contains nonmetals.

1. Name the first element

The first element is phosphorous (P). Since this is the first element and there is only one, we don't need a prefix.

  • Phosphorous

2. Second element

The second element is chlorine (Cl). It has a subscript of 5, so we must add the prefix of <u>hepta</u>-.

  • Phosphorous heptachlorine

Add the ending of -ide.

  • Phosphorous heptachloride

The prefix used for the second element is hepta. The compound name is phosphorous heptachloride.

6 0
3 years ago
How many sulfur dioxide<br> molecules are in 2.8 moles of<br> sulfur dioxide?<br> ?]<br> [?]x10?
marshall27 [118]
There are 1,69*10^2^4 molecules. Hope this helps. This was a hard question so if im right can u give brainliest?
8 0
3 years ago
What is a variable and what do it do
frosja888 [35]
Varuable, In algebra, a symbol (usually a letter) standing in for an unknown numerical value in an equation :)
3 0
3 years ago
Read 2 more answers
In a particular redox reaction, no2– is oxidized to no3– and cu2 is reduced to cu . Complete and balance the equation for this r
lianna [129]

Reduction half reaction: Cu²⁺(aq) + 2e⁻ → Cu⁰(s).


Oxidation half reaction: NO₂⁻(aq) + H₂O(l) → NO₃⁻(aq) + 2H⁺(aq) + 2e⁻.  

Balanced chemical reaction:

Cu²⁺(aq) + NO₂⁻(aq) + H₂O(l) → Cu(s) + NO₃⁻(aq) + 2H⁺(aq).

Copper is reduced from oxidation number +2 (Cu²⁺) to oxidation number 0 (Cu) and nitrogen is oxidized from oxidation number +3 (in NO₂⁻) to oxidation number +5 (in NO₃⁻).


8 0
3 years ago
Read 2 more answers
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