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Svetllana [295]
3 years ago
13

1. What is the molar mass of silicon?

Chemistry
1 answer:
hodyreva [135]3 years ago
8 0

Answer:

Si = 28

2) = 148

Explanation:

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DanielleElmas [232]

Answer:

Just Send Answers to make points

Explanation:

6 0
3 years ago
describe how a pure dry sample of solid lead carbonate can be obtained from sodium carbonate solution and lead nitrate solution
djyliett [7]

Answer:

Soluble salts can be made by reacting acids with soluble or insoluble reactants. Titration must be used if the reactants are soluble. Insoluble salts are made by precipitation reactions.

Making insoluble salts

An insoluble salt can be prepared by reacting two suitable solutions together to form a precipitate.

Determining suitable solutions

All nitrates and all sodium salts are soluble. This means a given precipitate XY can be produced by mixing together solutions of:

X nitrate

sodium Y

For example, to prepare a precipitate of calcium carbonate:

X = calcium and Y = carbonate

mix calcium nitrate solution and sodium carbonate solution together

calcium nitrate + sodium carbonate → sodium nitrate + calcium carbonate

Ca(NO3)2(aq) + Na2CO3(aq) → 2NaNO3(aq) + CaCO3(s)

It also works if potassium carbonate solution or ammonium carbonate solution is used instead of sodium carbonate solution. Remember that all common potassium and ammonium salts are soluble.

please mark as brainliest

Explanation:

7 0
2 years ago
How many moles in 110g of nahco3?
kenny6666 [7]
Hope this helps you.

5 0
3 years ago
3. A 4.00 gram sample of solid gold was heated from 274K to 314K. How much energy was involved?
MrMuchimi
Q = mcΔT = (4.00 g)(0.129 J/g•°C)(40.85 °C - 0.85 °C)
Q = 20.6 J of energy was involved (more specifically, 20.6 J of heat energy was absorbed from the surroundings by the sample of solid gold).
3 0
3 years ago
According to the bohr model of the atom which particles are allowed to exist, in any one of a number of a energy level
Licemer1 [7]
<span> the line-emission spectrum of an atom is caused by the energies released when electrons. releases energy of only certain values. </span>
5 0
3 years ago
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