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Ede4ka [16]
3 years ago
7

A sound is created when matter vibrates A.True B.False

Chemistry
2 answers:
Fed [463]3 years ago
5 0
A. True but what is it?
BartSMP [9]3 years ago
4 0
It can be true because when you create a sound by hitting matter and it vibrates it does create a sound. So it's TRUE.

HOPE THIS HELPS!
HAVE A GR8 DAY ;-)
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Qu 4.
Anna11 [10]

Answer:

It's the second one down.

Explanation:

Gold

Mass 197

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3 years ago
Explain the sources (SO2 & NOx)
lawyer [7]

Answer:

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Explanation:

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3 years ago
The molar heat capacity of ethane is represented in the temperature range 298 K to 400 K by the empirical expression Cp,m in J K
BabaBlast [244]

Answer:

-88.66 kJ/mol

Explanation:

The expressions of heat capacity (Cp,m) for C(s) and for H₂(g) are:

C(s):  Cp,m/(J K-1 mol-1) = 16.86 + (4.77T/10³) - (8.54x10⁵/T²)

H₂(g): Cp,m/(J K-1 mol-1) = 27.28 + (3.26T/10³) + (0.50x10⁵/T²)

Cp = A + BT + CT⁻²

For the Kirchoff's Law:

ΔHf = ΔH°f + \int\limits^{T2}_{T1} {DCp(T)} \, dT

Where ΔH°f is the enthalpy at 298 K, T1 is 298 K, T2 is the temperature given (373 K), and DCp is the variation of Cp (products less reactants). ΔH°f  for ethene is -84.68 kJ/mol and the reaction is:

2C(s) + 3H₂(g) → C₂H₆

So, DCp:

dA = A(C₂H₆) - [2xA(C) + 3xA(H₂)] = 14.73 - [2x16.86 + 3x27.28] = -100.83

dB = B(C₂H₆) - [2xB(C) + 3xB(H₂)] = 0.1272 - [2x4.77x10⁻³ + 3x3.26x10⁻³] = 0.10788

dC = C(C₂H₆) - [2xC(C) + 3xC(H₂)] = 0 - (2x(-8.54x10⁵) + 3x0.50x10⁵) = 15.58x10⁵

dCp = -100.83 + 0.10788T + 15.58x10⁵T⁻²

\int\limits^{373}_{298} {-100.83 + 0.10788T + 15.58x10^5T^{-2}} \, dT = -3796.48 J/mol = -3.80 kJ/mol (solved by a graphic calculator)

ΔHf = -84.68 - 3.80

ΔHf = -88.66 kJ/mol

7 0
3 years ago
When liquid lemonade is placed in a freezer, its temperature slowly drops. Its molecules move less and less until they can only
Natali5045456 [20]
The answer is A the heat is removed because it’s freezing and now the lemonade is frozen which makes a solid
8 0
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The density of Iron (Fe) is 7.9g/cm3, Copper (Cu) is 9.0g/cm3, Silver (Ag) is 10.5g/cm3, and Zinc (Zn) is 7.1g/cm3. Your friend
katovenus [111]

Answer: Use the formulas below to calculate the density of substances and ... Your friend wants to sell you a chain and swears that it's silver.

Explanation:

7 0
3 years ago
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