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3 years ago

6

it was observed that the atoms of a substance were arranged in a closely packed structure. What is most likely the state of matt

er of the substances? Gas Liquid Plasma Solid

1 answer:

Kryger [21]3 years ago

5 0

Answer:

Solid

Explanation:

Atoms are closely packed in a "<em>Solid</em>" substance, So, the substance is a solid.

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The answer for this question is: Atoms

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When harmful bacteria invade a wound, the skin around the wound turns red. This is known as:

nasty-shy [4]

Answer:

Inflammation

Explanation:

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3 years ago

A chemist working as a safety inspector finds an unmarked bottle in a lab cabinet. A note on the door of the cabinet says the ca

BaLLatris [955]

Answer: The density of the liquid is $1.10g/cm^3$

Explanation:

Density is defined as the mass contained per unit volume.

$Density=\frac{mass}{Volume}$

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Putting in the values we get:

$Density=\frac{938g}{852cm^3}$

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2 years ago

At a particular temperature the first-order gas-phase reaction N 2O 5→ 2NO 2 + (1/2)O 2 has a half-life for the disappearance of

m_a_m_a [10]

Answer:

B. 0.105 atm

Explanation:

Let's consider the following first-order reaction.

N₂O₅ → 2NO₂ + 1/2 O₂

We can find the pressure of N₂O₅ at a certain time t using the following expression.

$pN_{2}O_{5}=(pN_{2}O_{5})_{0}.e^{-k.t}$

where,

$(pN_{2}O_{5})_{0}$ is the initial pressure

k is the rate constant

Given the half-life (t1/2), we can calculate k using the following expression.

k = ln 2 / t1/2 = ln 2 / 5130 s = 1.351 × 10⁻⁴ s⁻¹

When t = 3.00 h (10,800 s),

$pN_{2}O_{5}=0.450atm.e^{-1.351 \times 10^{-4}s^{-1} \times 10,800 s } =0.105atm$

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3 years ago