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3 years ago

Which statement about subatomic particles is true?

Chemistry

2 answers:

katrin2010 [14]3 years ago

4 0

The statement that is true about the subatomic particle is

$\boxed{{\text{Electrons are the subatomic particles with the smallest mass}}}$

Further explanation:

Atom is the building unit of matter and is the smallest particle that an element can possess. The central part of an atom is called atomic nucleus. There are three subatomic particles, namely protons, electrons and neutrons in an atom. Out of these three, protons and neutrons reside in the nucleus of the atom while electrons revolve around the atomic nucleus in definite orbits.

Proton is the subatomic particle that carries a positive charge, electrons are negatively charged and neutrons are neutral with no charge on them.

Protons are the only subatomic particles to have charge.

Only neutrons have no charge whereas both protons and electrons are charged subatomic particles. Therefore this statement is false.

Electrons are the subatomic particles with the smallest mass.

The mass of an electron is $9.1 \times {10^{ - 31}}{\text{ kga}}$ , that of protons is $1.6726219 \times {10^{ - 27}}{\text{ kg}}$ and that of neutrons is $1.674927471 \times {10^{ - 27}}{\text{ kg}}$ . So the mass of electrons is the smallest among all the subatomic particles. Therefore this statement is true.

Neutrons orbit the nucleus of the atom.

Neutrons and protons are located inside the nucleus of an atom while electrons revolve around it in definite orbits. Therefore this statement is false.

Subatomic particles all have the same mass.

The mass of an electron is $9.1 \times {10^{ - 31}}{\text{ kg}}$ , that of protons is $1.6726219 \times {10^{ - 27}}{\text{ kg}}$ and that of neutrons is $1.674927471 \times {10^{ - 27}}{\text{ kg}}$ . The mass of protons and neutrons is almost same but that of electrons is quite different from masses of the other two particles. Therefore this statement is false.

Learn more:

Component of John Dalton’s atomic theory: brainly.com/question/2357175
Basis of investigation for the scientists: brainly.com/question/158048

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Atomic structure

Keywords: atom, matter, atomic nucleus, proton, electron, neutron, mass, positive charge, subatomic particle, smallest mass.

Dafna1 [17]3 years ago

3 0

The correct statement about subatomic particles is Electrons are the subatomic particles with the smallest mass.

The mass of protons and neutrons which are considered as 1 unit of mass of atoms is approximately 1836 times the mass of the electron

$\boxed {\boxed {\bold {Further ~ explanation}}}$

Atoms are composed of 3 types of basic particles namely protons, electrons, and neutrons

The mass of this basic particle is expressed in units of atomic mass

This atomic unit uses the standard atomic mass, that is, the C-12 isotope

1 atom C-12 = 12 atomic mass units

1 atomic mass unit = 1/12 x mass 1 C-12 atom

1 unit of atomic mass = 1.66.10⁻²⁴

the mass of each basic particle in atomic mass units is:

electron mass = 9.11.10⁻²⁸

proton mass = 1.6726.10⁻²⁴

neutron mass = 1,675.10⁻²⁴

The proton mass is considered to be equal to 1 atomic mass unit and a neutron which is also considered to be equal to 1 atomic mass unit

The charge of 1 proton is equal to a charge of 1 electron but has a different sign

The proton is positively charged (+1), the electron is negatively charged (-1). and neutrons not charged (neutral)

For a charge of 1 electron = e = 1.66.10⁻¹⁹ coulomb

Whereas the neutron charge = 0

Let's look at the answer choices

1. Protons are the only subatomic particles to have a charge.

This statement is wrong because in the nucleus there are electrons charged -

2. Electrons are the subatomic particles with the smallest mass.

The statement is true because the mass of protons and neutrons which are considered as 1 unit of mass of atoms is approximately 1836 times the mass of the electron

3. Neutrons orbit the nucleus of the atom.

This statement is wrong.

It can be explained by the Bohr atomic model, where electrons circulate the nucleus on a particular path so that electrons are not attracted to the nucleus.

4. Subatomic particles all have the same mass

This statement is wrong because the mass of protons and neutrons is the same while the electron mass is smaller

So the correct statement about subatomic particles is Electrons are the subatomic particles with the smallest mass.

$\boxed {\boxed{\bold {Learn ~ more}}}$

The subatomic particle

brainly.com/question/2224691

the main difference between the Bohr model of the atom and the rutherford model.

brainly.com/question/1528920

The equation between Bohr and Rutherford models

brainly.com/question/1184332

the hypothesis of Thomson's atomic model

brainly.com/question/10943651

Keywords: atomic model, Bohr, atoms, protons, electrons, atomic, neutrons

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The flask contains 10.0 mL of HCl and a few drops of phenolphthalein indicator. The buret contains 0.160 M NaOH. It requires 18.

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Answer:

Approximately $0.291\; \rm M$ (rounded to two significant figures.)

Explanation:

The unit of concentration $\rm M$ is the same as $\rm mol \cdot L^{-1}$ (moles per liter.) On the other hand, the volume of both the $\rm NaOH$ solution and the original $\rm HCl$ solution here are in milliliters. Convert these two volumes to liters:

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$\begin{aligned} n(\mathrm{NaOH}) &= c(\mathrm{NaOH})\cdot V(\mathrm{NaOH})\\ &= 0.160\; \rm mol \cdot L^{-1} \times 0.0182\; \rm L \approx 0.00291\; \rm mol\end{aligned}$ .

$\rm HCl$ reacts with $\rm NaOH$ at a one-to-one ratio:

$\rm HCl\; (aq) + NaOH\; (aq) \to NaCl\; (aq) + H_2O\; (l)$ .

Coefficient ratio:

$\displaystyle \frac{n(\mathrm{HCl})}{n(\mathrm{NaOH})} = 1$ .

In other words, one mole of $\rm NaOH$ would neutralize exactly one mole of $\rm HCl$ . In this titration, $0.291\; \rm mol$ of $\rm NaOH\!$ was required. Therefore, the same amount of $\rm HC$ should be present in the original solution:

$\begin{aligned}&n(\text{$\mathrm{HCl}$, original})\\ &= n(\mathrm{NaOH})\cdot \frac{n(\mathrm{HCl})}{n(\mathrm{NaOH})} \\ &\approx 0.00291\; \rm mol \times 1 = 0.00291\; \rm mol\end{aligned}$ .

Calculate the concentration of the original $\rm HCl$ solution:

$\displaystyle c(\text{$\mathrm{HCl}$, original}) = \frac{n(\text{$\mathrm{HCl}$, original})}{V(\text{$\mathrm{HCl}$, original})} \approx \frac{0.00291\; \rm mol}{0.0100\; \rm L} \approx 0.291\; \rm M$ .

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