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2 years ago

Which is a pure substance helium in a balloon

Chemistry

1 answer:

11Alexandr11 [23.1K]2 years ago

3 0

Answer:

An element is a pure substance as well, because if we fill up a balloon with just helium gas ,it will only contain helium atoms

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Electrons cause it is the right answer

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Drag each label to the correct location on the image.

Mandarinka [93]

Answer:

Uses energy: Amoeba and clock both use energy

Contains cells: true for the amoeba.

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Which of the following is not a property of most transition metals?

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Low melting point

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Conductivity (Electrical and Thermal)

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High melting point

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Which is a molecule? A. Ne B. NaCL C. Trail Mix D. graphene

elixir [45]

B) NaCl is a molecule.

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2 years ago

2 HI(g) ⇄ H2(g) + I2(g) Kc = 0.0156 at 400ºC 0.550 moles of HI are placed in a 2.00 L container and the system is allowed to rea

Alex_Xolod [135]

Answer: The concentration of hydrogen gas at equilibrium is 0.0275 M

Explanation:

Molarity is calculated by using the equation:

$\text{Molarity}=\frac{\text{Number of moles}}{\text{Volume of solution (in L)}}$

Moles of HI = 0.550 moles

Volume of container = 2.00 L

$\text{Initial concentration of HI}=\frac{0.550}{2}=0.275M$

For the given chemical equation:

$2HI(g)\rightleftharpoons H_2(g)+I_2(g)$

Initial: 0.275

At eqllm: 0.275-2x x x

The expression of $K_c$ for above equation follows:

$K_c=\frac{[H_2][I_2]}{[HI]^2}$

We are given:

$K_c=0.0156$

Putting values in above expression, we get:

$0.0156=\frac{x\times x}{(0.275-2x)^2}\\\\x=-0.0458,0.0275$

Neglecting the negative value of 'x' because concentration cannot be negative

So, equilibrium concentration of hydrogen gas = x = 0.0275 M

Hence, the concentration of hydrogen gas at equilibrium is 0.0275 M

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2 years ago