what makes an element the same as another element

The final temperature = 36 °C

The balanced combustion reaction for C₆H₆

2C₆H₆(l)+15O₂(g)⇒ 12CO₂(g)+6H₂O(l)  +6542 kJ

MW C₆H₆ : 78.11 g/mol

mol C₆H₆ :

[tex]\tt \dfrac{8.5}{78.11}=0.109[/tex]

Heat released for 2 mol C₆H₆ =6542 kJ, so for 1 mol

[tex]\tt \dfrac{0.109}{2}\times 6542=356.539~kJ/mol[/tex]

Heat transferred to water :

Q=m.c.ΔT

[tex]\tt 356.539=5.691~kg\times 4.18~kj/kg^oC\times (t_2-21)\\\\t_2-21=15\rightarrow t_2=36^oC[/tex]

umm explanation pls so i answee

Answer:

No. Moles  = 2.142   mole

Answer:

%m/m = 2.9 %

Explanation:

The mass percentage (m/m %) of a solution is calculated as follows:

m/m % = mass of solute/ mass of solution x 100

The solution is composed by : solute + solvent. In this case, the solute is NaCl and the solvent is water. We have:

mass of solute = 1.50 g

mass of solvent = 50.0 g

mass of solution = mass of solute + mass of solvent = 1.50 g = 50.0 g = 51.5 g

Thus, the mass percentage of NaCl in the solution is :

% m/m = (1.50 g)/(51.5 g) x 100 = 2.91 % ≅ 2.9 %

Answer:

7

Explanation:

This question is a neutralization reaction.

50 ml of 0.125 M of KOH = (50 x 0.125) = 6.25 ml

In this same way, 50 ml of 0.125M of HCl = 50x0.125

= 6.25 ml

Then KOH is going to neutralise the HCl fully suvh that the pH of the medium is going to be 7

(H+) + (OH-) = H2O

Then Kw = [H=][OH-]

= [H+]² = 10^-14

Such that [H+] = 10^-7

The pH would be = -log [H+]

= -log[10^-7]

When inputted on a calculator this gives us 7

= 7

This is our answer

Answer:

C

Explanation:

Grams 3/4

Answer:

9g

Explanation:

number of moles × the moleculars mass

Answer:

a. A color change

c. Precipitate being formed

e. A change in temperature

f. Bubbles being produced

Explanation:

Two types of changes occur namely: physical changes and chemical changes. A physical change does not affect the chemical composition of the substance involved. Physical changes include change of state etc.

However, on the other hand, a chemical change alters the chemical composition of the substances involved, hence, leading to the formation of new product(s). It is also called a chemical reaction. Since a new product is formed from the alteration of the chemical nature of the reacting substances, the following changes or indicators will be present or evident in a chemical reaction:

- color change of substance

- Precipitate being formed i.e. solid deposit

- A change in temperature

- Bubbles being produced (evolution of gas)

Answer:

Lithium 7

Explanation:

An isotope is based off the number of neutrons present 3+4=7

Look on the periodic table to find the element number

Answer:

Tenacity describes the reaction of a mineral to stress such as crushing, bending, breaking, or tearing. ... The majority of all minerals are brittle. An example is Quartz. (Minerals that are not brittle may be referred to as Nonbrittle minerals.)

Answer:

[tex]pH=2.3[/tex]

Explanation:

Hello!

In this case, since pyridinium chloride has a pKb of 8.77 which is a Kb of 1.70x10⁻⁹ and therefore a Ka of 5.89x10⁻⁵ which means it tends to be acidic, we write its ionization via:

[tex]C_5H_5NHCl(aq)+H_2O(l)\rightleftharpoons C_5H_5NCl^-(aq)+H_3O^+(aq)[/tex]

Because it is a Bronsted base which donates one hydrogen ion to the water to produce hydronium. Thus, we write the equilibrium expression with the aqueous species only:

[tex]Ka=\frac{[C_5H_5NCl^-][H_3O^+]}{[C_5H_5NHCl]}[/tex]

In terms of the reaction extent [tex]x[/tex], we write:

[tex]5.89x10^{-5}=\frac{x*x}{0.39-x}[/tex]

Thus, solving for [tex]x[/tex] we obtain:

[tex]x_1=-0.0048M\\\\x_2=0.0048M[/tex]

Clearly the solution is 0.0048 M because to negative values are not allowed, therefore, since it equals the concentration of hydronium which defines the pH, we write:

[tex]pH=-log([H_3O^+])=-log(0.0048)\\\\pH=2.3[/tex]

Best regards!

The molecule is the representative particle of molecular compounds. It is also the representative particle of diatomic elements.

Answer:

0.4941, 0.5059

Explanation:

[tex]P_N[/tex] = Partial pressure of nitrogen = 417 mm Hg

[tex]P_{Xe}[/tex] = Partial pressure of xenon = 427 mm Hg

Total pressure in the system is given by

[tex]P=P_N+P_{Xe}\\\Rightarrow P=417+427=844\ \text{mm Hg}[/tex]

Mole fraction is given by

[tex]X_N=\dfrac{P_N}{P}\\\Rightarrow X_N=\dfrac{417}{844}\\\Rightarrow X_{N}=0.4941[/tex]

For xenon

[tex]X_{Xe}=1-0.4941=0.5059[/tex]

or

[tex]X_{Xe}=\dfrac{P_{Xe}}{P}\\\Rightarrow X_{Xe}=\dfrac{427}{844}\\\Rightarrow X_{Xe}=0.5059[/tex]

So, mole fraction of nitrogen is 0.4941 and xenon is 0.5059.

Answer:

8.3

Explanation:

pH is the measure of the H+ or H30 (they r the same thing) ions in a solution. it is equal to -log[H+]. [H+]=  Molar concentration of H+ ions.

Answer:

CO + 2NaOH(aq) ---------- Na2CO3 + H2O

When carbon dioxide is dissolved in an aqueous solution of sodium hydroxide, the mixture reacts to yield aqueous sodium carbonate and liquid water. The net ionic equation is CO + [tex]2OH^{-}[/tex] → [tex]CO^{2-} _{3}[/tex]

The molecular formula for a process known as the net ionic equation only includes the species which are really involved in the reaction. In double displacement reactions, and redox reactions, including acid-base neutralization processes, the net ionic equation would be frequently employed.

When carbon dioxide is dissolved in an aqueous solution of sodium hydroxide, the mixture reacts to yield aqueous sodium carbonate and liquid water.

CO + 2NaOH → [tex]Na_{2} CO_{3} + H_{2}O[/tex]

The ionic equation can be written as:

CO + [tex]2Na^{+} + 2OH^{-}[/tex] → [tex]2Na^{+} + CO^{2-} _{3}[/tex]

Hence, the net ionic equation is CO + [tex]2OH^{-}[/tex] → [tex]CO^{2-} _{3}[/tex]

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Answer:

hi

Explanation:

Hello good evening' but for me it's a good night

Explanation:

Anyway, thank you for the points have a great day!

Answer:

A: 2

Explanation:

Level one has one sublevel, whereas a Level two has two sublevels.

Answer:

GRACIAS

Explanation:

Answer:

Thnx

Explanation:

Answer:

Explanation:

(NH4)2SO4+Pb(NO3)2...............PbSO4+2NH4NO3

The balanced net ionic equation for the reaction between ammonium sulfate (NH₄)2SO₄ and lead(II) nitrate Pb(NO₃)₂, resulting in the formation of lead(II) sulfate (PbSO₄), can be written as follows:

[tex]2NH_{4+} + SO_{4}^2- + Pb^{2+} + NO_{3-} + PbSO_{4} (s) + 2NH_{4+} + 2NO_{3-}[/tex]

In this equation, the ammonium cation (NH₄₊) and nitrate anion (NO₃₋) are spectator ions, meaning they appear on both sides of the equation and do not participate in the actual chemical reaction. Therefore, they are not included in the net ionic equation.

The net ionic equation represents only the species that undergo a change, which in this case is the sulfate anion (SO₄²⁻) and the lead(II) cation (Pb²⁺), leading to the formation of the white precipitate, lead(II) sulfate (PbSO₄).

Therefore, the balanced net ionic equation can be wriiten as:

[tex]2NH_{4+} + SO_{4}^2- + Pb^{2+} + NO_{3-} + PbSO_{4} (s) + 2NH_{4+} + 2NO_{3-}[/tex]

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Answer:

proton 5

Explanation:

I think it is fluorine

Answer:

A is the only neutral atom there.

Explanation:

It consists of 6 atoms 6 neutrons and 6 electrons which means it is neutral. I am currently in chemistry.

Answer:nonmetal

Explanation: gggg

Answer:

When the molecular composition changes.

Explanation:

A physical change is a change in size or appearance that can usually be reversed; a chemical change cannot be reversed easily and changes the atomic composition of something.

Answer:

[tex]T_f=26.7\°C[/tex]

Explanation:

Hello.

In this case, when two substances at different temperature are placed in contact in an isolated container, we can say that the heat lost by the hot substance is gained by the cold substance. In such a way, since granite is at 76.0 °C and water at 22.0 °C we infer granite is hot and water is cold, so we write:

[tex]Q_{granite}=-Q_{water}[/tex]

In terms of mass, specific heat and change in temperature, we write:

[tex]m_{granite}C_{granite}(T_f-T_{granite})=-m_{water}C_{water}(T_f-T_{water})[/tex]

Thus, since the temperature is the same for both substance, we can solve for it as shown below:

[tex]T_f=\frac{m_{granite}C_{granite}T_{granite}+m_{water}C_{water}T_{water}}{m_{granite}C_{granite}+m_{water}C_{water}}[/tex]

By plugging in each variable, we obtain:

[tex]T_f=\frac{11.1g*0.790\frac{J}{g\°C} *76.0\°C+22.0g*4.18\frac{J}{g\°C} *22.0\°C}{11.1g*0.790\frac{J}{g\°C} +22.0g*4.18\frac{J}{g\°C}}\\\\T_f=26.7\°C[/tex]

Best regards!

Answer:

I think that it might be 2.7

Explanation:

Answer:

liquid

a semi permeable membrane

oxygen

Explanation:

plz give me brainiest

true because I asked my sister

Answer:

false

Explanation:

yep

Answer:

Ionization Energy increases from left to right on the periodic table. Atomic radius decreases moving left to right on the periodic table.

Atomic size gradually decreases from left to right across a period of elements. This is because, within a period or family of elements, all electrons are added to the same shell.

Answer:

Trioxocarbonate (iv) are salts derived from trioxocarbonate (iv) acid when it reacts with metals and metallic oxides. All trioxocarbonate (iv) salts of Sodium (Na), Potassium (K) and Ammonium(NH4+) are soluble while all others are insoluble.