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3 years ago

What does the term normal imply when used in Alkanes?

Chemistry

1 answer:

arlik [135]3 years ago

7 0

Answer:

The simplest alkanes have their C atoms bonded in a straight chain; these are called normal alkanes. They are named according to the number of C atoms in the chain.

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Select the false statement below concerning period 4 transition elements. A. The nickel atom has 18 inner/core electrons. B. Bot

zepelin [54]

Explanation:

Atomic number of nickel is 28 and its electronic distribution is 2, 8, 8, 2, 8. Therefore, in the inner/core electrons there are 18 electrons.

Atomic number of chromium is 24 and its electronic configuration is $[Ar]4s^{1}3d^{5}$ . Whereas atomic number of manganese is 25 and its electronic configuration is $[Ar]4s^{2}3d^{5}$ .

Hence, the statement both chromium atom and the manganese atom have half-filled d sub-shells, is true.

Atomic number of Vanadium is 23 and its electronic configuration is $[Ar]4s^{2}3d^{3}$ . Atomic number of nickel is 28 and its electronic configuration is $[Ar]4s^{2}3d^{8}$ .

So, there are three unpaired electrons in a Vanadium atom and in nickel atom there are 2 unpaired electrons.

Hence, the statement vanadium atom has fewer unpaired electrons than the nickel atom, is false.

Atomic number of titanium is 22 and its electronic configuration is $[Ar]4s^{2}3d^{2}$ . Atomic number of zinc is 30 and its electronic configuration is $[Ar]4s^{2}3d^{10}$ .

There are no unpaired electrons in a zinc atom. Hence, the statement titanium atom has more unpaired electrons than the zinc atom, is true.

Atomic number of iron is 26 and its electronic configuration is $[Ar]4s^{2}3d^{6}$ . Since, 4s is the outermost shell so, in iron atom there are 2 valence electrons.

Hence, the statement iron atom has 8 valence electrons, is not true.

Thus, we can conclude that false statements below concerning period 4 transition elements are as follows.

The vanadium atom has fewer unpaired electrons than the nickel atom.

The iron atom has 8 valence electrons.

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3 years ago

Why are cleaning compounds often bases?

Whitepunk [10]

Cleaning agents are substances used to remove dirt, including dust, stains, bad smells, and ... Cleaning agents may also be solvent-based or solvent-containing and are then ... Often, surfactants and corrosion inhibitors are added to the acid.

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4 years ago

Read the scenario. is this an example of weather, climate, or neither?

Brilliant_brown [7]

Answer:

it is just because of the weather because that's how it usually is in Arizona

Explanation:

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2 years ago

A vessel of volume 22.4 dm3 contains 20 mol h2 and 1 mol n2 ad 273.15 k initially. All of the nitrogen reacted with sufficient h

NikAS [45]

Nitrogen combine with hydrogen to produce ammonia $\text{NH}_3$ at a $1:3:2$ ratio:

$\text{N}_2 \; (g) + 3 \; \text{H}_2 \; (g) \leftrightharpoons 2\; \text{NH}_3 \; (g)$

Assuming that the reaction has indeed proceeded to completion- with all nitrogen used up as the question has indicated. $3 \; \text{mol}$ of hydrogen gas would have been consumed while $2 \; \text{mol}$ of ammonia would have been produced. The final mixture would therefore contain

$17 \; \text{mol}$ of $\text{H}_2 \; (g)$ and
$2 \; \text{mol}$ of $\text{NH}_3 \; (g)$

Apply the ideal gas law to find the total pressure inside the container and the respective partial pressure of hydrogen and ammonia:

$\begin{array}{lll} P(\text{container}) &= & n \cdot R \cdot T / V \\ & = & (17 + 2) \; \text{mol} \times 8.314 \; \text{L} \cdot \text{kPa} \cdot \text{mol}^{-1} \cdot \text{K}^{-1} \\ & &\times 273.15 \; \text{K} / (22.4 \; \text{L}) \\ &=& 1.926 \times 10^{3} \; \text{kPa} \end{array}$
$\begin{array}{lll} P(\text{H}_2) &= & n \cdot R \cdot T / V \\ & = & (17) \; \text{mol} \times 8.314 \; \text{L} \cdot \text{kPa} \cdot \text{mol}^{-1} \cdot \text{K}^{-1} \\ & &\times 273.15 \; \text{K} / (22.4 \; \text{L}) \\ &=& 1.723 \times 10^{3} \; \text{kPa} \end{array}$
$\begin{array}{lll} P(\text{NH}_3) &= & n \cdot R \cdot T / V \\ & = & (2) \; \text{mol} \times 8.314 \; \text{L} \cdot \text{kPa} \cdot \text{mol}^{-1} \cdot \text{K}^{-1} \\ & &\times 273.15 \; \text{K} / (22.4 \; \text{L}) \\ &=& 2.037 \times 10^{2} \; \text{kPa} \end{array}$

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3 years ago

How much of Earth's atmosphere is made up of nitrogen and oxygen?

Archy [21]

The right answer is the option B. Close to 99 percent. The atmosphere is a mixture of gases: nitrogen, oxygen, CO2, H2O, argon, among others. Nitrogen is about 78% and oxygen is about 21%, so they two together constitute about 99 percent of the Earth's atmosphere.

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3 years ago

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What does the term normal imply when used in Alkanes?​

What does the term normal imply when used in Alkanes?