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34kurt
3 years ago
10

I NEED HELP PLEASE, THANKS!

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

Explanation:

<h2><u>Difference:</u></h2>

in single displacement reactions, one chemical species replaces a part of another chemical species whereas, in double displacement reactions, exchange of two ionic species between two molecules occur.

<h2><u>Similarities</u><u>:</u></h2>

A single replacement reaction occurs when one element replaces another element in one compound. This type of reaction is represented by: A + BC → B + AC. A double replacement reaction occurs when two ionic compounds exchange ions, producing two new ionic compounds.

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miskamm [114]
What force causes water to run down a mountain
5 0
3 years ago
Un átomo X posee 29 protones y de carga +2 ¿Cuántos electrones tiene?
lesya [120]

Responder:

27

Explicación:

Dado que:

Número de protones en el átomo X = 29

Carga en el átomo X = +2

Si no hay cargo neto;

número de protones = número de electrones

Sin embargo, dado que el átomo X tiene una carga de +2 (dando 2 electrones).

Por lo tanto,

Número de electrones = número de protones - número de carga en el átomo)

Número de electrones = (29 - 2) = 27

4 0
3 years ago
Which substance can be broken down by a chemical change
ELEN [110]
Lots of substances. Rocks, metals, minerals, you name it.
5 0
2 years ago
Read 2 more answers
4 Na + O2 → 2 Na2O<br><br> 6.79 moles of O2 will react to form how many moles of Na2O?
Nataly_w [17]

Answer:

13.94moles of Na₂O

Explanation:

The balanced reaction expression is given as:

        4Na  +  O₂  →   2Na₂O

Given parameters:

Number of moles of O₂ = 6.97moles

Unknown:

Number of moles of Na₂O

Solution:

 To solve this problem;

            1 mole of O₂  will produce 2 moles of Na₂O ;

            6.97 moles of O₂ will produce 6.97 x 2  = 13.94moles of Na₂O

6 0
2 years ago
Both protons and neutrons (and their anti-particles) froze out:
VladimirAG [237]
I think Both protons and neutrons (and their anti-particles) froze out at 1013 K, about 0.0001 seconds after the Big Bang. Protons and neutrons are sub atomic particles of an atom that are found in the nucleus of an atom. Proton is the positively charge particle while the neutron has no charge. The proton positive charge accounts for the positive nuclear charge. 
6 0
3 years ago
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