Post-Lecture Assignment Chapter 06
Animation-Changes of State
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When a solid is placed in a container and heat is applied, a phase change occurs. Watch the video and sort the parts of the curve based on whether the average energy of the molecules is changing, or is constant.
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The liquid is heated at the boiling point
The solid is heated at the melting
point
The liquid is heated to reach the
boiling point
The solid is heated to reach the
melting point
Average molecule energy change
Average molecule energy constant
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Answer:

The correct answer is h20

Explanation:

i got it right on an exam.

Answer:

Nose

Explanation:

Because every time I touch it's nose, it will hide itself into the shell faster than other places

Hi!the main weakness of the tortoise is it's shell.The most shell of tortoise are so hard that most animals can't even make a scratch on it But flip one over and getting up will be a huge problem. They can suffer from dehydration or get picked off by predators. And even though reptiles are sun loving, they still can't regulate their body temperature and this could lead to over heating and death.

Answer:

no idea with the answer pls check with otherr

Answer:

D.  The reaction described by curve B is occurring with a catalyst.

Explanation:

The peak in the curve is the activation energy.  According to this graph, the activation energy was lowered.  A catalyst is what you can use to lower the activation energy.

The most likely accounts for the difference between curve A and curve B on the energy diagram is the reaction described by curve B is occurring with a catalyst,  therefore  option (d) is correct.

A catalyst is a chemical substance which alters the rate of a reaction without itself undergoing any permanent chemical change.

A catalyst does not initiate a chemical reaction. A catalyst does not be consumed in the reaction.

Catalysts tend to react with reactants to form intermediates and at the same time facilitate the production of the final reaction product. After the whole process, a catalyst can regenerate.

Catalysts encourage molecules to react and make the whole reaction process easier and efficient.

The most likely accounts for the difference between curve A and curve B on the energy diagram is the reaction described by curve B is occurring with a catalyst,  ,hence option (d) is correct.

Learn more about catalyst ,here:
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Answer:

7.2 mol * (6.02*10^23)= 4.3*10^24 atoms

Explanation:

The number of atoms in one mole of chlorine contains 6.022 × 10²³ . Therefore the number of Cl atoms in 7.2 moles is 4.3 × 10²⁴.

One mole of every substance contains 6.022 × 10²³ atoms. This number is called Avogadro number. One mole of every elements contains Avogadro number of atoms.

Chlorine is 17th element in periodic table. Cl is a non-metal with high electronegativity. The atomic mass of Cl is 35.5 g. Thus, 35.5 g contains Avogadro number of Cl atoms.

One mole of Cl contains  6.022 × 10²³  atoms. Tus, number of atoms in 7.2 mol is Avogadro number times the number of moles.

no.of atoms =  6.022 × 10²³  × 7.2 =  4.3 × 10²⁴ atoms.

Therefore, 7.2 moles of Cl contains 4.3 × 10²⁴ atoms.

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Answer:

C

Evaporation happens when a liquid substance becomes a gas. When water is heated, it evaporates. The molecules move and vibrate so quickly that they escape into the atmosphere as molecules of water vapor.

Answer:

a) Neutral

b) Basic

c) Acidic

d) Acidic

e) Basic

f) Neutral

g)

Explanation:

a) KCl is a neutral salt because K ion in solution form produces both acid and base (KOH)

b) NaClO produces basic solution because ClO− is the conjugate base of a weak acid

c) Al(ClO4)3 will produce acidic solution because ClO4 is component of strong acid

d)  NH4Cl will produce acidic solution because NH4+  ion is a strong conjugate acid of the weak base and Cl- is a weak conjugate base of the strong acid

e) Basic

f) Neutral salt

g) Acidic

Explanation:

The octet rule states that atoms tend to form compounds in ways that give them eight valence electrons and thus the electron configuration of a noble gas. ... Atoms of nonmetals tend to gain electrons in order to fill their outermost principal energy level with an octet.

Answer:

d.

Explanation:

It is a force that occurs when surfaces touch each other.

Answer: Frequency

Explanation: Without a doubt my answer is Frequency, none of the other options have nothing to do with sound waves so Frequency is my best bet.

Answer:

D. [tex]2NaBr + Cl_2\rightarrow 2NaCl + Br_2[/tex]

Explanation:

Hello!

In this case, for the given set of chemical reactions, it is possible to infer that D. is a categorized as redox due to the following:

Since both chlorine and bromine remain as diatomic gases, their oxidation states in such a form is 0, but as anions with lithium cations they have a charge of - according to the following reaction and half-reactions:

[tex]2NaBr + Cl_2\rightarrow 2NaCl + Br_2[/tex]

[tex]Cl_2^0+2e^-\rightarrow 2Cl ^-\\\\2Br^- \rightarrow Br_2^0+2e^-[/tex]

Unlike the other reactions whereas no change in the oxidation states is evidenced.

Answer:

D. 2NaBr + Cl2

Answer:

158.35 K

Explanation:

Using the general gas law

P₁V₁/T₁ = P₂V₂/T₂ where P₁ = 150.4 kPa, V₁ = 12.2 L, T₁ = 22.7 °C = 273 + 22.7 = 295.7 K, P₂ = 101.3 kPa, V₂ = 9.7 L and T₂ = unknown.

Making T₂ subject of the formula, we have

T₂ = P₂V₂T₁/P₁V₁

Substituting the values of the variables into the equation, we have

T₂ = P₂V₂T₁/P₁V₁

T₂ = 101.3 kPa × 9.7 L × 295.7 K/150.4 kPa × 12.2 L

T₂ = 290,557.777 K/1,834.88

T₂ = 158.35 K

Answer:

gain

Explanation:

Answer:

b. in the middle

Explanation:

your answer choice is correct!

Answer:

nitrous oxide

Explanation:

Answer:

A. Ba(OH)₂ (aq) <==> Ba²⁺ (aq) + 2OH¯ (aq)

B. The molar concentration of OH¯ is 0.072 M

C. The pH of the solution is 12.86

Explanation:

A. Dissociation equation

Barium hydroxide Ba(OH)₂ dissolves in water by the following equation:

Ba(OH)₂ (aq) <==> Ba²⁺ (aq) + 2OH¯ (aq)

B. Determination of the molar concentration of OH¯.

We'll begin by calculating the number of mole in 1.5 g of Ba(OH)₂. This can be obtained as follow:

Mass of Ba(OH)₂ = 1.5 g

Molar mass of Ba(OH)₂ = 137 + 2(16 + 1)

= 137 + 2(17)

= 137 + 34

= 171 g/mol

Mole of Ba(OH)₂ =?

Mole = mass / Molar mass

Mole of Ba(OH)₂ = 1.5 / 171

Mole of Ba(OH)₂ = 0.009 mole

Next, we shall determine the molarity of Ba(OH)₂. This can be obtained as follow:

Mole of Ba(OH)₂ = 0.009 mole

Volume of solution = 0.250 L

Molarity of Ba(OH)₂ =?

Molarity = mole / Volume

Molarity of Ba(OH)₂ = 0.009 / 0.250

Molarity of Ba(OH)₂ = 0.036 M

Finally, we shall determine the molar concentration of OH¯.this can be obtained as follow:

Ba(OH)₂ (aq) <==> Ba²⁺ (aq) + 2OH¯ (aq)

From the balanced equation above,

1 mole of Ba(OH)₂ produced 2 moles OH¯.

Therefore, 0.036 M Ba(OH)₂ will produce = 0.036 × 2 = 0.072 M OH¯.

Therefore, the molar concentration of OH¯ is 0.072 M

C. Determination of the pH.

We'll begin by calculating the pOH of the solution. This can be obtained as follow:

Concentration of OH¯, [OH¯] = 0.072 M

pOH =?

pOH = –Log [OH¯]

pOH = –Log 0.072

pOH = 1.14

Finally, we shall determine the pH. This can be obtained as follow:

pOH = 1.14

pH =?

pH + pOH = 14

pH + 1.14 = 14

Collect like terms

pH = 14 – 1.14

pH = 12.86

Answer:

The atomic number is the number of protons in the nucleus

Answer:

2

Explanation:

75.0 g of ammonium sulfate

Answer:

D. For the atoms lower in the periodic table, the valence electrons are in higher energy levels and farther from the nucleus.

Explanation:

Atomic radius increases down the group because down the group, there an increase in the number of principle energy levels occupied. Now, these higher principal energy levels are made up of orbitals that are larger than the orbitals from the lower energy levels in size.

Therefore, the effect of this is that the greater number of principal energy levels will outweigh the increase in nuclear charge since nuclear charge also increases down the group and this in turn makes the atomic radius to increase as we go down the group.

Answer: C. For the atoms lower in the periodic table, the balance electrons are in higher energy levels and farther from the nucleus.

Explanation: As the valance electrons orbit farther from the nucleus the energy level increases from the top to the bottom of the periodic table. So the atoms lower in the periodic table, the balance electrons are in higher energy levels and farther from the nucleus, which result in an increase in the atomic radius.

Answer:

The given equation [tex]Al(OH)_3[/tex] →[tex]Al_2O_3+H_2O[/tex] is the type of decomposition reaction.

Explanation:

DECOMPOSITION REACTION-: A decomposition reaction occurs when a single compound decomposes into two or more elements or new compounds. These reactions take place when energy is supplied in the form of heat, electricity, or light, which allows the material to break down into simpler substances.

The most common form of decomposition reaction is -

      [tex]AB[/tex] → [tex]A+B[/tex]

TYPES OF DECOMPOSITION REACTION IS -

    Example- As calcium carbonate (limestone or chalk) is heated, it breaks down into calcium oxide and carbon dioxide. The following is the chemical reaction:

                [tex]CaCO_3[/tex] →[tex]CaO+CO_2[/tex]

      Example -: When electricity is passed through an aqueous solution of sodium chlorine (NaCl), sodium and chlorine are created.

                   NaCl → Na + Cl

    Example - As silver chloride is exposed to light, it decomposes into silver metal and chlorine.

              [tex]2AgCl[/tex] →[tex]2Ag+Cl_2[/tex]

Answer:

nice

Explanation:

how is it

Answer:

7) C. Sodium

8) G. 1 valence electron

Explanation:

Answer: C. All atoms of one kind share common properties.

Explanation:

Answer:

32000 kilometers

Explanation:

In order to convert from miles to kilometers, we need to use a conversion factor. In other words, we put miles in the denominator and kilometers in the numerator, as follows:

That way the units for miles cancel each other, leaving the equivalent amount in kilometers.

Answer:

[tex]2LiCl +Br_2 \rightarrow 2LiBr +Cl_2[/tex]

Single displacement reaction.

Explanation:

Hello!

In this case, by firstly rearranging the chemical reaction as shown below:

[tex]LiCl +Br_2 \rightarrow LiBr +Cl_2[/tex]

It is also necessary to balance it at follows:

[tex]2LiCl +Br_2 \rightarrow 2LiBr +Cl_2[/tex]

Thus, since bromine and chlorine are being exchanged as a result of the atoms rearrangement, we infer this is a single displacement reaction.

Best regards!

Hey there! :

Molar mass:

Al = 26.9815 g/mol

AlCl₃ = 133.3405 g/mol

Reaction stochemistry ,calculates the mass of AlCl3 produced

2 Al + 3 Cl₂ =  2 AlCl₃

2 * 26.9815 g Al ---------------------  2 *  133.3405 g AlCl₃

8.82 g Al -------------------------------  ( mass of AlC₃ )

mass of AlCl₃  =  ( 8.82 * 2 * 133.3405 ) /  ( 2 * 26.9815 )

mass of AlCl₃ = 2352.12642 / 53.963

mass of AlCl₃ = 43.58 g of AlCl₃

Hope this helps!