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2 years ago

CAN SOMEONE PLEASE HELP ME ASAP PLEASEE ANYBODY LITERALLY ANYONE OUT THERE PLEASE

Chemistry

1 answer:

IgorC [24]2 years ago

4 0

Answer:

Electrons

Explanation:

Atoms can combine together and share electrons between them. Atoms that share electrons are linked to each other in a form, called a molecule that is in a lower energy state than either of the separate atoms alone.

Pls Brainliest! It would mean a lot! ;)

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What temperature in celsius is 563.18 K

OleMash [197]

Answer:

Explanation: So 1 Kelvin is equal to -272.15 Celsius. Now we need to do some math,

563,180 x -272.15 = -153,269,437 Celsius

I hope this helps :)

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2 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

2 years ago

A reaction occurs when solid X is placed into solution Y. As a result, the temperature of the new solution increases by 3°C. The

Hoochie [10]

Answer:Increased the number of molecular collisions and increased the reaction rate

Explanation:

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2 years ago

A laboratory technician needs to prepare 500 milliliters of a 2 M solution of sodium hydroxide (NaOH) in a flask. The flask has

Marat540 [252]

Answer:

40 g NaOH

Step-by-step explanation:x

To make 500 mL of a 2 mol·L⁻¹ solution, the technician must measure the correct mass of NaOH.

Step 1. Calculate the moles of NaOH

c = n/V Multiply both sides by V

n = Vc

c = 2 mol·L⁻¹

V =0.5 L

n = 0.5 × 2

n = 1 mol NaOH

Step 2. Calculate the mass of NaOH

The molar mass of NaOH is 40.00 g/mol.

m = 1 × 40.00/1

m = 40 g NaOH

The technician must measure 40 g of NaOH.

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2 years ago

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Silicon is located in this spot. What is it most likely to be.

dexar [7]

Answer:I would have to say d because isn’t that what they make phones out of and it has to be safe right ?

Explanation:

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2 years ago