Answer:
- Option <u><em>d) isotope</em></u>.
Explanation:
All atoms of a same element have equal number of protons (atomic number) but <em>may</em> <em>differ in the number of neutrons.</em>
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The atoms that differ in the number of neutrons are named<em> isotopes</em>.
For example: carbon-12 and carbon-13 are diferent isotopes of the same element, carbon. They have the same number of protons (6, which is the atomic number of carbon). On the other hand, while carbon-12 has 6 neutrons, carbon-13 has 7 neutrons.
As per the other choices:
- a) <em>anions</em> are ions with negative charges: atoms (or group of atoms) that have gained one or more electrons.
- b) <em>cations</em> are ions with positive charge: atoms (or group of atoms) that have lost one or more electrons.
- e) <em>atoms</em> are the individual minimum parts of an element that preserves the properties of such element. All atoms of the same element have the same number of protons and have, essentially, the same chemical properties.
Answer:
24.5 moles of mercury are produced
Explanation:
The descomposition of mercury(II) oxide, occurs as follows:
2HgO → 2Hg + O₂
<em>Where 2 moles of HgO produce 2 moles of Hg</em>
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In other words, the ratio of descomposition of HgO/Hg is 2/2 = 1:1
That means, if 24.5 moles of mercury(II) oxide descompose:
<h3>24.5 moles of mercury are produced</h3>
Answer:
2.41 x 10²³ particles
Explanation:
Data Given:
no. of moles of KCl = 0.4 mol
no. of particles = ?
Solution:
To find number of particles we use following formula
number of moles = number of particles / Avogadro's number
as we have to find number of particles so rearrange the above equation
no. of particles = no. of moles x Avogadro's number . . . . . . . (1)
Where
Avogadro's number = 6.022 x 10²³ particles per mol
6.022 x 10²³ are number of particles in one mole of a substance. and this quantity is known as Avogadro's number
So,
put values in above equation 1
no. of particles = 0.4 mol x 6.022 x 10²³ (particles/mol)
no. of particles = 2.41 x 10²³ particles
So, 0.4 mol KCl contains 2.41 x 10²³ representative particles
The gravitational force would change because once the astronaut moves away from the Earth, the gravitational force gets weaker.