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3 years ago

I need help with this problem please

Chemistry

1 answer:

Shtirlitz [24]3 years ago

6 0

Answer:Li2O

Explanation: Lithium is an alkali metal in Group 1. It has a single valence electron that it would be pleased to give up, or share, with another element. Oxygen is in Group 16, just one removed from the halogens. It has 6 valence electrons, and wants 2 mosr to complete it's valence shell. One lithium will contribute 1 electron, so oxh=ygen will keep looking for a second. If another lithium is available, it will react with that one also, resulting in Li2O.

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Determine the packing efficiency of a simple cubic unit cell that contains one atom with a metallic radius of 175 pm.

PilotLPTM [1.2K]

Answer:

the packing efficiency is 52.36%

Explanation:

Given the data in the question;

simple cubic unit cell that contains one atom with a metallic radius of 175 pm;

we know that;

Edge length of Simple cubic (a) is related to radius of atom (r) as follows;

a = 2r

since radius r = 175 pm

we substitute

a = 2 × 175 pm

a = 350 pm

Now we get the volume unit;

Volume of unit cell = a³ = ( 350 pm ) = 42875000 pm³

Next we get Volume of sphere;

Volume of Sphere = $\frac{4}{3}$ πr³

Volume occupied by 1 atom = $\frac{4}{3}$ × π × ( 175 pm )³

= $\frac{4}{3}$ × π × 5359375 pm³

= 22449297.5 pm³

Now, the packing efficiency = ( Volume occupied by 1 atom / Volume of unit cell ) × 100

we substitute;

packing efficiency = ( 22449297.5 pm³ / 42875000 pm³ ) × 100

= 0.523598 × 100

= 52.36%

Therefore, the packing efficiency is 52.36%

8 0

3 years ago

How many atoms are in an oxygen molecule (O2) ?

ella [17]

There are two oxygen atoms in an oxygen molecule. Denoted by the 2 following O

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4 years ago

The melting of ice cubes is an exothermic reaction.<br>true or false

scoray [572]

Answer:

false

Explanation:

5 0

4 years ago

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PLZZZ HELP ME ASAP

Vesna [10]

de Broglie's wave equation describes that particles have wave properties. The equation is

λ = h/mv

Where λ is the wave length of the particle (m), h is the Planck's constant (6.62607 x 10⁻³⁴J s), m is the mass of a particle (kg) and v is the velocity (m/s).

λ = ?

h = 6.62607 x 10⁻³⁴ J s

m =200 g = 0.2 kg

v = 20 m/s

By substitution,

λ = 6.62607 x 10⁻³⁴ J s / (0.2 kg x 20 m/s)

λ = 1.66 x 10⁻³⁴ m

Hence, the wavelength of the 200 g ball 1.66 x 10⁻³⁴ m.

7 0

3 years ago

All of the statements are true about the arrangement of elements in the periodic table EXCEPT that the

LUCKY_DIMON [66]

Answer: C) rare earth elements are in the first column, on the left.

Explanation:

In fact, rare earth elements are in the third column, on the left.

The periodic table of the elements is an arrangement of the chemical elements in the form of a table, ordered by their atomic number (number of protons), by their configuration of electrons and their chemical properties. It was progressively developed over time as the scientific knowledge advanced; for this reason many modifications and corrections might be done in the future.

This table is divided into rows and columns, which represent the periods and groups or families. For its location the atomic number and valence of each element was considered.

In this sense, the elements in the periodic table are mainly arranged as follows:

-Alkali metals and Alkaline Earth metals in the first two columns, on the left.

-Rare earth elements in the third column (rows 6 and 7), on the left.

-Transition metals in the center.

-Basic metals and semi-metals to the right

-Non-metals to the right (and Hidrogen in the first row and column)

-Noble gases (or inert gases) farthest to the right.

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3 years ago

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