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Lemur [1.5K]
3 years ago
15

How do electrons impact the movement of electricity?

Chemistry
1 answer:
Oliga [24]3 years ago
5 0
When a positive charged object is placed near a conductor electrons are attracted the the object. Metals contain free moving delocalized electrons. When electric voltage is applied, an electric field within the metal triggers the movement of the electrons, making them shift from one end to another end of the conductor.
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Physical changes occur when matter changes its property but not its
NNADVOKAT [17]
This statement is true
8 0
2 years ago
Chemical properties of sodium
Svetlanka [38]

Answer:

Density 0.97 g.cm -3 at 20 °C

Melting point 97.5 °C

Boiling point 883 °C

oxidation states +1, −1 (rare)

Explanation:

Have a nice day

5 0
3 years ago
If 4.20 mol Al was mixed with 1.75 mol Fe2 O3 which reactant is the limiting reactant?
Dafna11 [192]
4.20 mol Al would react completely with 4.20 x (1/2) = 2.10 mol Fe2O3, but there is not that much Fe2O3 present, so Fe2O3 is the limiting reactant. (1.75 mol Fe2O3) x (2/1) x ( 55.8452 g Fe/mol) = 195 g Fe 3 MgO + 2 H3PO4 → Mg3(PO4)2 + 3 H2O (15.0 g MgO) / (40.3045 g MgO/mol) = 0.37217 mol MgO (18.5 g H3PO4) / (97.9953 g H3PO4/mol) = 0.18878 mol H3PO4 0.18878 mol H3PO4 would react completely with 0.18878 x (3/2) = 0.28317 mole of MgO, but there is more MgO present than that, so MgO is in excess and H3PO4 is the limiting reactant. Now we must consider why the problem tells us "17.6g of Mg3(PO4)2 is obtained". The first possibility is that it's just there for the sake of confusion -- in which case ignore it and proceed this way: ((0.37217 mol MgO initially) - (0.28317 mole MgO reacted)) x (40.3045 g MgO/mol) = 3.59 g MgO left over However, if the amount of magnesium phosphate obtained is given because the reaction was stopped before it was complete, the amount obtained governs the amount reacted and the amount left over, so proceed this way: (17.6g Mg3(PO4)2) / (262.8581 g Mg3(PO4)2/mol) x (3/1) = 0.20087 mol MgO reacted ((0.37217 mol MgO initially) - (0.20087 mole MgO reacted)) x (40.3045 g MgO/mol) = 6.90 MgO left over
7 0
3 years ago
When using microscopes, what are the two variables that matter the most<br>i think its chemistry.​
PtichkaEL [24]

Answer:

magnification and resolution  

Explanation:

Two parameters are especially important in microscopy: magnification and resolution. Magnification is a measure of how much larger a microscope (or set of lenses within a microscope) causes an object to appear.

4 0
2 years ago
Why is there no gas pressure in a vacuum?
kramer
 no gas pressure in a vacuum - like space 

nothing to 'contain' the gas 

we have air pressure because of gravity - 
air is like waves over the earth - i.e. high and low pressure 
high means a lot of air 
low means a little and a hurricane or stormy weather is imminent 

all the best
4 0
2 years ago
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