Chemistry College

A neutral atom contains 5 neutrons and 4 protons. How many electrons does it contain?

Answers

Answer 1
the answer is it has 4 electrons. If an atom is neutral than the electrons and protons will be equal.
Answer 2
Final answer:

A neutral atom with 4 protons contains 4 electrons because, in a neutral atom, the number of protons and electrons are equal.

Explanation:

In chemistry, a neutral atom is one where the number of protons and electrons are equal. Protons carry a positive charge while electrons carry a negative charge. When these charges balance out, the atom is neutral. Hence, in the case of this atom with 4 protons, it must also have 4 electrons to keep it neutral. it means that it had no overall change So, the answer is that a neutral atom with 4 protons contains 4 electrons.

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Related Questions

What is wrong with the following explanation of an experiment? When it was heated, the sample of carbon decomposed.

Answers

"Carbon" is an element. It is found in the fourth group of the periodic table, and it is a stable element. This means that it can not be decomposed via heating, because if an element were to break down, it would release its subatomic particles. The explanation was probably one used to describe the thermal decomposition of a compound into smaller compounds.

What kind of orbital is occupied by the lone pair electrons in caffeine molecule?

Answers

The middle nitrogen has two sigma bonds and one pi bond. You know that one p orbital is used in the double bond and two sp2 orbitals are involved in the sigma bond. This leaves one sp2 orbital for the lone pair to occupy.
Final answer:

The lone pair electrons in a caffeine molecule are located in an sp³ hybrid orbital. This classification comes from observing atoms with similar structures, such as the nitrogen atom in ammonia. Hybrid orbitals are a theoretical model to explain electron behavior, and sp³ and sp² hybridizations are common in structures with lone pair electrons.

Explanation:

The lone pair electrons in a caffeine molecule are typically found in an sp³ hybrid orbital. For instance, in the nitrogen atom of ammonia, which is structurally similar to parts of caffeine, we find three bonding pairs and a lone pair of electrons surrounding the atom. These are directed to the four corners of a tetrahedron, evincing that the nitrogen atom is sp³ hybridized, with one hybrid orbital occupied by the lone pair.

Essentially, any central atom surrounded by three regions of electron density will exhibit sp² hybridization. This includes molecules with a lone pair on the central atom and molecules with two single bonds and a double bond connected to the central atom.

It's important to realize that these hybrid orbitals are a theoretical model to describe the behavior of electrons within a molecule. So, in caffeine, we can predict where lone pairs of electrons are likely to be based on our knowledge of electron behavior and atomic structure.

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The density of platinum is 21.45 g/cm3 at 20 ∘c. calculate the mass of 80.00 cm3 of platinum at this temperature.

Answers

The formula for density = mass/volume.
We know the density (21.45 g/cm³)
We know the volume (80.00 cm³) of the sample
We don't know the mass, so first - solve the equation for mass:

D=m/v  [multiply v to both sides to isolate m]
Dv=m

Now, insert the known value and units...make sure the units cancel properly:
21.45 g/cm³ x 80.00 cm³ = 1716 g

Final answer:

The mass of 80.00 cm3 of platinum at 20 ℃, given its density of 21.45 g/cm3, is calculated to be 1716 grams (1.716 kilograms) using the formula Mass = Density × Volume.

Explanation:

To calculate the mass of 80.00 cm³ of platinum at a temperature of 20 ℃, given that the density of platinum is 21.45 g/cm³, we use the formula for density:

Density = Mass / Volume.

Rearranging this formula to find mass gives us Mass = Density × Volume.

Substituting the known values:

Density = 21.45 g/cm³Volume = 80.00 cm³

Gives us:

Mass = 21.45 g/cm3 × 80.00 cm³ = 1716 g or 1.716 kg.

Thus, the mass of 80.00 cm³ of platinum at 20 ℃ is 1716 grams or 1.716 kilograms.

A liquid has a density of 1.17 g/cm3, how many liters of the liquid have a mass of 3.75 kg

Answers

There are 1000 cm3 in 1 liters. Hence 1 liter of the liquid would weigh: 1000 cm3 x (1.17 g/cm3) = 1170 gm and there are 1000 gm in 1 kg, so we want enough liters to have a mass of 3.75 kg x 1000 gm/kg = 3750 gm Hence, # of liters = desired mass / # of gm per liter = 3750 gm / 1170 gm/liter = 3.2051282 liters
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