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3 years ago

Crystals are characterized by particular patterns that repeat in how many dimensions? A. three dimensions

Chemistry

2 answers:

Andreyy893 years ago

8 0

A option is correct answer .

ruslelena [56]3 years ago

4 0

Answer:

A. three dimensions

Explanation:

Crystal lattice have a three dimensional array of repeating units. For example, in the NaCl crystal the repeating units are the Na⁺ and Cl⁻ ions. The Na⁺ and Cl⁻ ions are arranged alternately along the x, y and z axis. The smallest repeating unit of a cell is called unit cell. Crystal lattice have a definite geometry which is because of this rigid array of unit cells.

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3 years ago

calcium and strontium are close to one another on thw oeriodic table. what do you know about their ionization energies ,their el

Firdavs [7]

Both Ca and Sr are in Group 2 of the Periodic Table, with Sr below Ca (see image)..

Ionization energies

They are both metals, so they have relatively low ionization energies.

Sr is below Ca in the Group, so Sr has the lower ionization energy.

Electron configurations

Their electron configurations both end in ns².

For example, the electron configuration of Ca is [Kr]4s² and that of Sr is [Kr]5s².

Physical chsrscteristics:

metallic lustre
malleable
ductile
good conductors of heat and electricity

Chemical characteristics

Both metals react with

• Hydrogen to form hydrides: M + H₂ ⟶ MH₂

• Oxygen to form oxides: 2M + O₂ ⟶ 2MO

• Nitrogen to form nitrides: 3M + N₂ ⟶ M₃N₂

• Halogens to form halides: M + X₂ ⟶ MX₂

• Water to displace hydrogen: M + 2H₂O ⟶ M(OH)₂ + H₂

4 0

3 years ago

In this experiment you used an excess of the BaCl2 solution. How would your results be affected if you did not use an excess of

Igoryamba

if we did not use an excess of the BaCl2 solution it would decrease the mass percentage of sulfate in the unknown sample.

The net precipitation equation would be.

Ba2+(aq) + SO42-(aq) → BaSO4(s)

If BaCl2 (Ba2+) is not taken in excess then the precipitation would not be completed as some of the sulfate ions would still be remaining in the solution. This would decrease the mass percentage of sulfate in the unknown sample.

If some tiny pieces of filter paper still remained mixed with the precipitate(BaSO4) then the mass of sulfate would increase and it gives a high mass percentage of the sulfate.

mass percentage of sulfate = (mass of sulfate/mass of sample)*100

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2 years ago

You throw a barbeque for your friends. Before you start the grill, your propane tank has a pressure of 78 psi. When you’re finis

Dvinal [7]

Answer:

b. 485 kPa

Explanation:

Gay-Lussac's law express that the pressure of a gas under constant volume is directly proportional to the absolute temperature. The equation is:

P1T2 = P2T1

P is pressure and T absolute temperature of 1, initial state and 2, final state of the gas

Where P1 = 74psi

T2 = 20°C + 273.15 = 293.15K

P2 = ?

T1 = (95°F -32) * 5/9 + 273.15 = 308.15K

Replacing:

74psi*293.15K = P2*308.15K

70.4psi

In kPa:

70.4psi * (6.895kPa / 1psi) =

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3 years ago

Mention 4 products formed formed from destructive distillation of coal

LenaWriter [7]

coal gas, gas carbon, coal tar and ammonia liquor,

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3 years ago

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