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dem82 [27]
3 years ago
9

What is the difference between a contractor and a starter

Chemistry
1 answer:
Lunna [17]3 years ago
6 0
"A contactor is a electrically controlled switch which uses an electromagnetic coil to pull in the contacts.”

"A motor starter is a contactor, plus an overload relay that will drop out the coil voltage if the motor overloads. If there is not overload relay, it is not a starter any longer, it's back to being just a contactor."
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0.5mol/dm3 hydrochloric acid is added gradually to a flask containing 20cm3 of 2 mol/ dm3 sodium hydroxide solution.
sweet-ann [11.9K]

Answer:

The answer is B which is 40

7 0
2 years ago
When 2 crystalline solid barium hydroxide octahydrate and crystalline solid ammonium nitrate are mixed in a beaker at room tempe
podryga [215]
It is endothermic reaction ΔH>0 (sign is +).
Because it is spontaneous reaction ΔG<span><0 (Gibbs free energy)
</span>ΔG=ΔH-TΔS, so must be TΔS>ΔH and ΔS<span>>0 (sign +).</span>
5 0
3 years ago
5. Which are generally less soluble, compounds with chlorate ions or carbonate ions?
Vitek1552 [10]

Answer:

Compounds with Carbonate ions are less soluble than the compounds with Chlorate ions.

Explanation:

The reason is that the compounds with carbonate ions have less attraction between positive and negative charges. (Solvation)

7 0
3 years ago
Used to measure an exact volume of liquids
irakobra [83]
Breaker measures a large amount and graduated cylinder measures a small amount
6 0
3 years ago
A 2.89 g sample of a metal chloride, MCl2, is dissolved in water and treated with excess aqueous silver nitrate. The silver chlo
dsp73

Answer:

58.0 g/mol

Explanation:

The reaction that takes place is:

  • MCl₂ + 2AgNO₃ → 2AgCl + M(NO₃)₂

First we <u>calculate how many moles of silver chloride</u> were produced, using its <em>molar mass</em>:

  • 6.41 g AgCl ÷ 143.32 g/mol = 0.0447 mol AgCl

Then we <u>convert AgCl moles into MCl₂ moles</u>, using the <em>stoichiometric ratio</em>:

  • 0.0447 mol AgCl * \frac{1molMCl_2}{2molAgCl} = 0.0224 mol MCl₂

Now we<u> calculate the molar mass of MCl₂</u>, using the original<em> mass of the sample</em>:

  • 2.86 g / 0.0224 mol = 127.68 g/mol

We can write the molar mass of MCl₂ as:

  • Molar Mass MCl₂ = Molar Mass of M + (Molar Mass of Cl)*2
  • 127.68 g/mol = Molar Mass of M + (35.45 g/mol)*2

Finally we<u> calculate the molar mass</u> of M:

  • Molar Mass of M = 57 g/mol

The closest option is 58.0 g/mol.

6 0
3 years ago
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