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4 years ago

Make a sketch that shows how thermal and chemical energy

1 answer:

3 0

Ammonium chloride is salt, and when we add solid salt into water, it’s dissolved and nothing happens. The only thing happens when any salt dissolved in water, is becoming its ions and improve its conductivity.

NH4Cl(s) + H2O(l) → NH4+(aq) + Cl-(aq) + H2O(l)

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In the reaction __S+3O2→2SO3, what coefficient should be placed in front of the S to balance the reaction?

AleksAgata [21]

Answer:

Explanation:

because on the product side you have 2 sulfurs so you need 2 on the reactant side.

7 0

3 years ago

Copper atoms are used to produce pennies. The copper atoms in pennies share many electrons. Pennies contain

kaheart [24]

Answer:

Metallic bonds

Explanation:

Metallic bonds joins atoms of metals and atoms of alloys together. The copper used in making pennies is a metallic substance so it contains metallic bonds.

The formation of this bond type is predicated on the large atomic radius, low ionization energy and large number of electrons in the valence shell.
The bond is an attraction between the positive nuclei of all closely packed atoms in the lattice and the electron cloud.
The electron cloud is jointly formed by all the atoms by losing their outermost shell electrons.

This way the bond in pennies are metallic in nature.

5 0

3 years ago

What are all the possible masses of cl2 molecules that are made when two chlorine atoms bond together?

Pavel [41]

The masses of the 2 most common isotopes of Cl are 35 and 37. Therefore we can formulate 3 possible masses of Cl2:

<span>
35 + 35 = 70
35 + 37 = 72
37 + 37 = 74

<span>However, Cl 35 is the most common isotope of chlorine of the two therefore it is the most probable that two Cl 35 atoms will combine, so 70 is the most common among all.

</span></span>

6 0

3 years ago

Read 2 more answers

4.) A In an experiment, 1.056 g of a metal carbonate,

yKpoI14uk [10]

<h3>Answer:</h3>

M= Cu

<h3>Explanation:</h3>

From the question;

Mass of metal carbonate = 1.056 g

Mass of CO₂ = 0.376 g

We are required to identify the metal M in the carbonate

The equation for the combustion of the carbonate;

MCO₃(s) + heat → MO(s) + CO₂(g)

<h3>Step 1: Calculating the number of moles of CO₂</h3>

Moles = Mass ÷ molar mass

Molar mass CO₂ = 44.01 g/mol

Moles = 0.376 g ÷ 44.01 g/mol

= 0.00854 Moles

<h3>Step 2: Determining the moles of MCO₃ </h3>

From the equation;

1 mole of the metal carbonate decomposes to yield 1 mole CO₂

Therefore; Mole ratio of MCO₃ : CO₂ = 1 : 1

Hence; Moles of MCO₃ = 0.00854 moles

<h3>Step 3: Determining the molar mass of MCO₃</h3>

Moles of MCO₃ = 0.00854 moles

Mass of the carbonate = 1.056 g

But;

Molar mass = Mass ÷ moles

= 1.056 g ÷ 0.00854 moles

= 123.65 g/mol

<h3>Step 4: Atomic mass of the metal </h3>

The molar mass of metal carbonate = 123.65 g/mol

Atomic mass of carbon = 16

Atomic mass of oxygen = 12.01

Therefore;

123.65 g = M + 12.01 + (16 ×3)

M = 63.64 g

The atomic mass of M is 63.64 approximately the same as that of copper.

Atomic mass of Cu is 63.546

Therefore, identity of M is Cu

3 0

3 years ago

An aqueous solution contains 0.23 M potassium hypochlorite.

Arturiano [62]

Answer:

0.22 mol HClO, 0.11mol HBr.

0.25mol NH₄Cl, 0.12 mol HCl

Explanation:

A buffer is defined as a mixture in solution between weak acid and its conjugate base or vice versa.

Potassium hypochlorite (KClO) could be seen as conjugate base of HClO (Weak acid). That means the addition of <em>0.22 mol HClO </em>will convert the solution in a buffer. HBr reacts with KClO producing HClO, thus, <em>0.11mol HBr</em> will, also, convert the solution in a buffer. 0.23 mol HBr will react completely with KClO and in the solution you will have only HClO, no a buffering system.

Ammonia (NH₃) is a weak base and its conjugate base is NH₄⁺. That means the addition of <em>0.25mol NH₄Cl</em> will convert the solution in a buffer. Also, NH₃ reacts with HCl producing NH₄⁺. Thus, addition of<em> 0.12 mol HCl</em> will produce NH₄⁺. 0.25mol HCl consume all NH₃.

5 0

3 years ago