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Gnoma [55]
3 years ago
15

What is the symbol for the change in enthalpy?

Chemistry
1 answer:
Aloiza [94]3 years ago
4 0
Delta H.
It suppose to be a little triangle in front of the H but i don't have the delta sigh in my phone. So sorry.
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write the names of the following compounds. 1) iron + sulphur . 2) manganese + oxygen. aluminium + sulphur​
Vlada [557]

Answer:

  1. FeS
  2. MnO₂
  3. Al₂S₃

Explanation:

<u>1) Iron + Sulphur = ?</u>

→ Iron sulfide

<u>2) Manganese + Oxygen = ?</u>

→ Manganese dioxide

<u>3) Aluminium + Sulphur = ?</u>

→ Aluminium sulfide

8 0
2 years ago
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An open flask sitting in a lab refrigerator looks empty, but it is actually filled with a mixture of gases called air. If the fl
ira [324]

Answer:

9.39 × 10²² molecules

Explanation:

We can find the moles of gases (n) using the ideal gas equation.

P . V = n . R . T

where,

P is the pressure (standard pressure = 1 atm)

V is the volume

R is the ideal gas constant

T is the absolute temperature (standard temperature = 273.15 K)

n=\frac{P.V}{R.T} =\frac{1atm.3.50L}{(0.08206atm.L/mol.K).273.15K} =0.156mol

There are 6.02 × 10²³ molecules in 1 mol (Avogadro's number). Then,

0.156mol.\frac{6.02\times10^{23}molecules}{mol} =9.39\times10^{22}molecules

4 0
3 years ago
I don't unerstand what I'm supposed to do for these
shepuryov [24]
You just need to multiply the terms and transform to kj by dividing by 1000
1) 10.4kj
2) 14.5 kj 
3) 44.8 kj
4) 1.04 kj

and there you go.
8 0
3 years ago
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Which of the following is a true statement about science?
Papessa [141]
D. All of the answers are true
4 0
3 years ago
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In a laboratory experiment, John uses a mesh to separate soil particles from water. Which technique of separation is he using?
Aneli [31]
Salutations!

<span>In a laboratory experiment, John uses a mesh to separate soil particles from water. Which technique of separation is he using?

The technique that John is using is the filtration technique. Filtration is a technique to separate the solid which is insoluble from the liquid. For instance: Sand and water, sand is insoluble, thus it stays in the filter paper, while the water proceeds through the filter paper.

Hope I helped :D</span>
3 0
3 years ago
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