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4 years ago

9

A brown solid element conducts electricity well. Is it a metal or non-metal?

2 answers:

OLga [1]4 years ago

7 0

Answer:

it's a metel

Explanation:

as far as it can conduct electricity.

it's not a metal if it can't except it it's a metalloids

cupoosta [38]4 years ago

6 0

Answer:

Metal

Explanation:

Metals conduct electricity, because they have free and mobile electrons that can carry the electricity and spread it around. Nonmetals usually cannot conduct electricity, but there are a few exceptions.

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How many electrons are in the π system of the ozone molecule, o3?

algol13

Ozone 03 have 2 sigma bond and 1 pie bond.
just remember this and you can do any problem for pie and sigma with this.
single bond = 1 sigma
double bond = 1 sigma and 1 pie
triple bond = 1 signa and 2 pie

7 0

3 years ago

A compound consists of only one type of element?

Gnoma [55]

Answer:

A compound can easily be split up into its different elements.

Explanation:

5 0

3 years ago

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Umnica [9.8K]

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4 0

3 years ago

An element crystallizes in a face-centered cubic lattice. If the length of an edge of the unit cell is 0.408 nm, and the density

V125BC [204]

Answer:

Au

Explanation:

For the density of a face-centered cubic:

$Density = \dfrac{4 \times M_w}{N_A \times a^3}$

where

$M_w$ = molar mass of the compound

$N_A=$ avogadro's constant

$a^3 =$ the volume of a unit cell

Given that:

Density $(\rho)$ = 19.30 g/cm³

a = 0.408 nm

a = $0.408 \times 10^{-9} \times 10^{2} \ cm$

a = $4.08 \times 10^ {-8} \ cm$

∴

$19.3 = \dfrac{4 \times M_w}{(6.023 \tmes 10^{23})\times (4.08 \times 10^{-8})^3}$

$M_w= \dfrac{19.3\times (6.023 \times 10^{23})\times (4.08 \times 10^{-8})^3}{4}$

$M_w=197.37 \ g/mol$

Thus, the molar mass of 197.37 g/mol element is Gold (Au).

4 0

3 years ago

How many moles of water are made from complete reaction of 2.2 moles of oxygen gas with hydrogen gas? Given the reaction: 2H2 +

nadezda [96]

Answer : The number of moles of water produced are, 4.4 moles.

Explanation : Given,

Moles of oxygen gas = 2.2 moles

The given chemical reaction is:

$2H_2+O_2\rightarrow 2H_2O$

By the stoichiometry we can say that, 2 moles of hydrogen gas react with 1 mole of oxygen gas to give 2 moles of water as a product.

From the balanced chemical reaction we conclude that,

As, 1 mole of oxygen gas react to give 2 moles of water.

So, 2.2 mole of oxygen gas react to give $2.2\times 2=4.4$ moles of water.

Thus, the number of moles of water produced are, 4.4 moles.

3 0

3 years ago