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Debora [2.8K]
3 years ago
8

How refrigerator magnets work

Chemistry
2 answers:
Neporo4naja [7]3 years ago
7 0

Answer:

the fridge is a magnet

Explanation:

magnets connect to fridge

Alchen [17]3 years ago
6 0

Answer:

Explanation:

Fridge magnets are made of weakly ferromagnetic ceramics like barium ferrite or strontium ferrite. The magnetic field created by the fridge magnet aligns the spins of unpaired electrons in metal atoms in the fridge in such a way that the magnet and the fridge door are attracted to each other; this force keeps the magnet stuck to the fridge.

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Read 2 more answers
A certain reaction has an enthalpy of Δ=44 kJ and an activation energy of a=61 kJ. What is the activation energy of the reverse
avanturin [10]

Answer:

E = 17 kJ

Explanation:

The enthalpy of the reaction is:

\Delta H = E_{p} - E_{r}  

<u>Where</u>:

Ep: is the energy of the products

Er: is the energy of the reactants

Similarly, the enthalpy of the reaction is related to the activation energy forward (E_{F}) and to the activation energy reverse (E_{R}) as follows:

\Delta H = E_{F} - E_{R}  

Having that ΔH = 44 kJ and E_{F} = 61 kJ, the activation energy of the reverse reaction is:

E_{R} = E_{F} - \Delta H = 61 kJ - 44 kJ = 17 kJ  

Therefore, the activation energy of the reverse reaction is 17 kJ.

I hope it helps you!

3 0
3 years ago
A water skier is pulled by a net force of 165 N and has an acceleration of 2.2 m/s2. What is the mass of the skier?
TiliK225 [7]
A) 75 kg

Answer^


Explanation:

a = Fnet / m : plug the numbers in

2.2 m/s ^2 = 165n /m : now cross multiple

22m / 165 : now divide 22 to both sides

M = 75

3 0
3 years ago
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