CHEMISTRY HIGH SCHOOL

How many moles are in 4.818 x 1024 chloride ions

Answers

Answer 1

Answer:

Answer:

The answer is 8.00 moles

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

$n = (N)/(L) \n$

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

$n = \frac{4.818 * {10}^(24) }{6.02 * {10}^(23) } \n = 8.00332225...$

We have the final answer as

8.00 moles

Hope this helps you

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In going across a row of the periodic table, protons and electrons are added and ionization energy generally increases. In going down a column of the periodic table, protons and electrons are also being added but ionization generally decreases. Explain.

Answers

Answer:

Explanation:

Ionization energy:

It is the minimum amount of energy required to remove the electron from isolated gaseous atom to make the ion.

As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell.

When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required. Where as,

When we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.

As the size of atom increases the ionization energy from top to bottom also decreases because it becomes easier to remove the electron because of less nuclear attraction and as more electrons are added the outer electrons becomes more shielded and away from nucleus.

Final answer:

In a period (across a row), ionization energy generally increases due to an increased atomic charge pulling electrons inward. In a group (down a column), despite more protons and electrons being added, the ionization energy decreases due to the electrons occupying larger and higher-energy orbitals, making them easier to be removed.

Explanation:

As we traverse a row (period) in the periodic table from left to right, the count of protons as well as electrons increases with every subsequent element. This increase makes the nucleus more positively charged, which in turn pulls the additional electrons inward, reducing atomic size and increasing ionization energy. Ionization energy refers to the energy required to remove an electron from an atom. An increase in ionization energy in a period is because it's difficult to remove an electron from a smaller, low-energy orbital.

However, when we move down a column (group) in the periodic table, despite the fact that protons and electrons are being added, ionization energy decreases. This decrease is primarily because the electrons being added are going into larger and higher energy orbitals farther from the nucleus, making them easier to remove. Hence, the ease of electron removal explains the decrease in ionization energy as we move down a group in the periodic table.

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What volume of carbon dioxide is produced when 0.489 mol of calcium carbonate reacts completely according to the following reaction at 0°C and 1 atm? calcium carbonate ( s ) calcium oxide ( s ) + carbon dioxide ( g )

Answers

Answer:

11.0L of carbon dioxide is produced

Explanation:

Balanced equation: $CaCO_(3)(s)\rightarrow CaO(s)+CO_(2)(g)$

According to balanced equation, 1 mol of $CaCO_(3)$ produces 1 mol of $CO_(2)$

So, 0.489 mol of $CaCO_(3)$ produces 0.489 mol of $CO_(2)$

Let's assume $CO_(2)$ behaves ideally.

So, $P_{CO_(2)}V_{CO_(2)}=n_{CO_(2)}RT$

where P is pressure, V is volume , n is number of moles, R is gas constant and T is temperature in kelvin

Plug-in all the values in the above equation-

$(1atm)* V_{CO_(2)}=(0.489mol)* (0.0821L.atm.mol^(-1).K^(-1))* (273K)$

or, $V_{CO_(2)}=11.0L$

So, 11.0L of carbon dioxide is produced

Which term is defined as a measure of the disorder of a system? (A) heat (B) kinetic energy (C) entropy (D) activation energy

Answers

The question is asking which of the following choices is defined as a measure of the disorder of a system, and base on the question and further research of the said question, I would say that the answer would be C. Entropy. I hope you are satisfied with my answer and feel free to ask for more

Answer:

C. Entropy

Explanation:

Heat is defined as the energy transferred from a hotter to a cooler body.

Kinetic energy is defined as the energy of a body in motion.

Entropy is a thermodynamic quantity that could be defined as a mesure of the disorder of a system. For a ordered crystal, entropy is zero.

Activation energy is defined as the minimum quantity of energy required to activate a particular chemical process.

I hope it helps!

Which compound is an example of a binary ionic compound?Question 6 options:

H2O

H2SO4

MgF2

SF6

Answers

C, Since binary ionic compound is only of 2 elements. Mg is ionic and so i F so thats it. H20 is covalent B is more than 1 element, D looks dodgy, nah its dat ionic compunds wouldnt form big ones like SF (6)

C is the correct answer.

yes, the right answer is C. MgF2

Which of these reactions can be classified as double replacement reactions?A) Zn + 2HCl → ZnCl2 + H2

B) 2NaCl + F2 → 2NaF + Cl2

C) 2AlBr3 + 3K2SO4 → 6KBr + Al2(SO4)3

D) 2K + MgBr2 → 2KBr + Mg

Answers

C is the answer. Reasons being that, two elements from both side of the reactant switches side to form two new compounds. On the other hand, A , B and D involves one element displacing the other to produce a new compound.

Answer:

The correct answer is option C.

Explanation:

Double displacement reaction is defined as the reaction in which exchange of ions takes place to give a product.

$AB+CD\rightarrow CB+AD$

Single displacement reaction is defined as the reaction in which more reactive element displaces a less reactive element from its chemical reaction.

$AB+C\rightarrow CB+A$

From all the given options the reaction which is classified as Double displacement reaction is :

$2AlBr_3 + 3K_2SO_4\rightarrow 6KBr + Al_2(SO_4)_3$

Where as other reactions are the examples of Single displacement reaction.

Over 100 existing elements are listed and classified on the ____________________.

Answers

Final answer:

The Periodic Table of Elements lists over 100 known elements, providing critical information such as the element's atomic number, symbol, name, and atomic mass. Elements are grouped based on their chemical properties and electron configuration.

Explanation:

Over 100 existing elements are systematically organized and displayed on the Periodic Table of Elements. Each box on the Periodic Table represents a different element and provides critical information such as the element's atomic number, symbol, name, and atomic mass. Elements are grouped together based on their chemical properties and electron configuration, which is a representation of the organization of electrons around the nucleus.

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Final answer:

Over a hundred elements, both naturally occurring and experimentally discovered, are listed and classified on the Periodic Table of the Elements. They are sorted by atomic number, and those with similar properties and valence shells are grouped into columns and rows respectively.

Explanation:

Over 100 existing elements are listed and classified on the Periodic Table of the Elements. This list of elements is arranged in ascending order of atomic number, which is the number of protons in each nucleus. The periodic table not only identifies the chemical symbol, atomic number, and mass number of each element but also groups elements according to their propensity to react with other elements.

It's important to note that elements found on the periodic table have an equal number of protons and electrons. However, the number of protons and neutrons may not always be equal across all elements. In addition to the 92 naturally occurring elements, there are several larger, unstable elements that have been discovered experimentally

Aside from organizing elements according to their atomic number, the periodic table is also structured in a way that elements with similar properties compose columns in the table, while elements with the same number of valence shells compose rows, making it an essential tool for understanding and predicting chemical behaviors.

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