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pickupchik [31]
3 years ago
9

A battery is connected at its positive end by a wire to the head of an iron nail. The wire then coils aground the nail to its ti

p and from there to the negative end of the battery.
Predict what would happen to the strength of the electromagnet in each situation.
Using a battery with a higher voltage:
Wrapping the wire around the nail only three times:
Changing the direction of the current by reversing the battery connections:
Using a plastic stick in place of the iron nail:
Holding the nail vertically rather than horizontally: it
Chemistry
2 answers:
cupoosta [38]3 years ago
7 0

Answer:

sing a battery with a higher voltage:  

✔ stronger force of attraction

Wrapping the wire around the nail only three times:  

✔ weaker force of attraction

Changing the direction of the current by reversing the battery connections:  

✔ no change

Using a plastic stick in place of the iron nail:  

✔ weaker force of attraction

Holding the nail vertically rather than horizontally:  

✔ no change

Explanation: You're Welcome

puteri [66]3 years ago
7 0

Answer:

✔ stronger force of attraction

✔ weaker force of attraction

✔ no change

✔ weaker force of attraction

✔ no change

Explanation:

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he equilibrium constant, Kc , for the following reaction is 7.00×10-5 at 673 K.NH4I(s) NH3(g) + HI(g)If an equilibrium mixture o
frosja888 [35]

<u>Answer:</u> The number of moles of HI in the solution is 1.24\times 10{-3} moles.

<u>Explanation:</u>

We are given:

K_c=7.00\times 10^{-5}\\n_{NH_3}=0.405mol\\n_{NH_4I}=1.45mol\\V=4.90L

To calculate the concentration of a substance, we use the equation:

\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}     ......(1)

  • Concentration of ammonia:

[NH_3]=\frac{0.405mol}{4.90L}=0.083mol/L

  • Concentration of ammonium iodide:

[NH_4I]=\frac{1.45mol}{4.90L}=0.30mol/L

For the given chemical reaction:

NH_4I(s)\rightleftharpoons NH_3(g)+HI(g)

The expression of K_c for above equation follows:

K_c=\frac{[HI][NH_3]}{[NH_4I]}

Putting values in above equation, we get:

7.0\times 10^{-5}=\frac{[HI]\times 0.083}{0.30}

[HI]=2.53\times 10^{-4}

Calculating the moles of hydrogen iodide by using equation 1, we get:

2.53\times 10^{-5}=\frac{\text{Moles of HI}}{4.9}\\\\\text{Moles of HI}=1.24\times 10^{-3}

Hence, the number of moles of HI in the solution is 1.24\times 10{-3} moles.

3 0
3 years ago
In a mixture of He, O, and N, gases He exerts a partial pressure of 15.22 mm Hg and
gayaneshka [121]

Answer:

P(N)  = 38.48 mmHg

Explanation:

Given data:

Partial pressure of He = 15.22 mmHg

Partial pressure of O = 35.21 mmHg

Partial pressure of N = ?

Total pressure = 88.91 mmHg

Solution:

According to Dalton law of partial pressure,

The total pressure inside container is equal to the sum of partial pressures of individual gases present in container.

Mathematical expression:

P(total) = P₁ + P₂ + P₃+ ............+Pₙ

Now we will solve this  problem by using this law.

P(total) = P(He) + P(O) + P(N)

88.91 mmHg = 15.22 mmHg + 35.21 mmHg + P(N)

88.91 mmHg = 50.43 mmHg + P(N)

P(N)  = 88.91 mmHg  - 50.43 mmHg

P(N)  = 38.48 mmHg

7 0
3 years ago
Which substance is least soluble at 90°C?
jekas [21]

Answer:

NH3

Explanation:

Which salt is least soluble at 90 degrees Celsius

7 0
3 years ago
50 points!! i need 3 answers!!!
tester [92]
Option E, Real gas particles have more complex interactions than ideal gas particles.

In ideal gases, there is absolutely no interaction between any atoms. At all. Atoms simply don't bump into each other in ideal gases.

Obviously, you know that's unrealistic. In real gases, atoms collide into each other all the time.

-T.B.
3 0
3 years ago
Read 2 more answers
The Lewis dot notation for two atoms is shown.
Iteru [2.4K]

Answer:

Mg donates two electrons to O

Explanation:

Lewis dot notation uses dots and crosses to represent valence electrons on atoms.

Magnesium is a metal and would donate or lose electrons during bonding.

Oxygen is a non metal and would gain electrons during bonding.

The correct option is;

Mg donates two electrons to O

5 0
3 years ago
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