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In-s [12.5K]
3 years ago
6

A table has several directional compasses, several lengths of wire, a battery, an ammeter, a light bulb, a battery holder and a

rubber eraser.
A student is asked to create an electric motor. Looking at the materials provided, what other materials would they need?
A) An armature
B) An iron nail.
Reactivate
C) A permanent magnet
Reactivate
D) an electric generator.
Chemistry
2 answers:
umka21 [38]3 years ago
8 0

An electric motor needs a permanent magnet to spin the armature.

lubasha [3.4K]3 years ago
5 0
<span>C) A permanent magnet
Reactivate</span>
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2. If 1.204 X 1024 atoms of sodium is 20% of the total sodium atoms in sodium
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Answer:

584.2 g

Explanation:

Hello there!

In this case, since we know the 20% of the atoms correspond to sodium, we can compute the total atoms as shown below:

\frac{1.204 x10^{24}}{0.2}=6.02x10^{24}atoms

Which are also equal to 1 mol and the Avogadro's number of sodium chloride with a molar mass of 58.44 g/mol; thus, the grams of salt turn out to be:

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At 22 °C, an excess amount of a generic metal hydroxide, M(OH)2, is mixed with pure water. The resulting equilibrium solution ha
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Answer:

2.29x10⁻¹² is Ksp of the salt

Explanation:

The Ksp of the metal hydroxide is:

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As you can see in the reaction, 2 moles of OH⁻ are produced per mole of M²⁺. It is possible to find [OH⁻] with pH, thus:

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And [M²⁺] is the half of [OH⁻], <em>[M²⁺] = 8.30x10⁻⁵</em>

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Replacing in Ksp formula:

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