Which of the following are pure elements

Iron has a density of 7.86 g/cm3 ( 1 cm3=1 mL ). Calculate the volume (in dL ) of a piece of iron having a mass of 3.92 kg . Not

igomit [66]

The volume (in dL) of the piece of iron having a mass of 3.92 kg is 4.99 dL

<h3>What is density? </h3>

The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as

Density = mass / volume

<h3>How to determine the volume of the iron</h3>

From the question given above, the following data were obtained:

Mass of iron = 3.92 kg = 3.92 × 1000 = 3920 g
Density of iron = 7.86 g/cm³
Volume of iron =?

Density = mass / volume

Thus,

Volume = mass / density

Volume of iron = 3920 / 7.86

Volume of iron = 498.7277 cm³

Divide by 100 to express in dL

Volume of iron = 498.7277 / 100

Volume of iron = 4.99 dL

Thus, the volume of the iron is 4.99 dL

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6 0

2 years ago

Which substance will have its particles of matter held most closely together?

bazaltina [42]

Answer:

c air inside an air mattress

Explanation:

let me know if you need more help

3 0

2 years ago

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On the basis of molecular structure and bond polarity, which of the following compounds is most likely to have the greatest solu

Drupady [299]

Answer:

$\boxed{\text{c) NH$_{3}$; hydrogen bonding}}$

Explanation:

For each of these molecules, you must determine their VSEPR structure and then identify the strongest intermolecular forces.

Remember that water is a highly polar molecule.

a) CH₄

Electron geometry: tetrahedral

Molecular geometry: tetrahedral

Bond polarity: C-H bond nonpolar

Molecular polarity: nonpolar

Strongest IMF: London dispersion forces

Solubility in water: low

A nonpolar molecule is insoluble in a polar solvent.

b) CCl₄

Electron geometry: tetrahedral

Molecular geometry: tetrahedral

Bond polarity: C-Cl bond nonpolar

Molecular polarity: nonpolar (symmetrical molecule. All bond dipoles cancel)

Strongest IMF: London dispersion forces

Solubility in water: low

A nonpolar molecule is insoluble in a polar solvent.

d) PH₃

Electron geometry: tetrahedral

Molecular geometry: trigonal pyramidal

Bond polarity: P-H bonds are polar

Molecular polarity: polar (all P-H bond dipoles point towards P)

Strongest IMF: dipole-dipole

Solubility in water: soluble

A polar molecule is soluble in a polar solvent.

c) NH₃

Electron geometry: tetrahedral

Molecular geometry: trigonal pyramidal

Bond polarity: N-H bonds are highly polar

Molecular polarity: highly polar (all N-H bond dipoles point towards N)

Strongest IMF: hydrogen bonding

Solubility in water: highly soluble

NH₃ is so polar that it can form hydrogen bonds with water.

$\boxed{\textbf{The compound with the greatest solubility in water is NH$_{3}$}}$

8 0

3 years ago

Explain why sharpening a pencil is a different type of physical change it freezing water to make ice cubes

laila [671]

Because you can't make the pencil go back to normal form

8 0

4 years ago

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Which of the following elements has 3 electrons in the 2p sublevel?

Arlecino [84]

Answer:

the answer is D. N

8 0

3 years ago