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timama [110]
2 years ago
9

The primary coil in a transformer has 250 turns; the secondary coil has 500. Which is correct?

Chemistry
1 answer:
pishuonlain [190]2 years ago
4 0

Answer: B. is the correct one.

Explanation:

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3 years ago
Explain each of the following observation the melting point of lithium is higher than that of potassium
lakkis [162]

Due to its small size, lithium has a high melting and boiling point.

<h3>Why does lithium have high melting and boiling point explain?</h3>

With only one valence electron to contribute to the metallic lattice, lithium and potassium are both alkali metals. We could infer that the metallic bonding is less strong between the electron cloud and the larger potassium cation than it is in the lithium structure. This means that because lithium creates a smaller cation, the electrostatic force in this situation should be greater also Lithium has high ionization energy and a high melting and boiling point because of its small size. As a result, its crystal structure has an extremely high binding energy.

<h3>Alkali metals</h3>

The chemical elements lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium make up the alkali metals (Fr). They make up group 1, which is located in the s-block of the periodic table, along with hydrogen.

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5 0
2 years ago
How many moles are in 5g of Na2CO3? <br>a) 0.047<br>b) 1<br>c) 2<br>d)21.2​
stepladder [879]

Answer:

0.047

Explanation:

Data : 5g , Na2CO3

Formula:

Molecular mass of Na2Co3 = no.of atomic mass x no. of atom

moles = mass÷ molecular mass

molecular mass = 2(23)+1(12)+3(16)

=106amu

moles = 5÷106

= 0.047 Ans:

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3 years ago
What the significance of “Er” in the diagram
Vlada [557]

Answer:

D

Explanation:

3 0
3 years ago
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