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4 years ago

Which question cannot be explained by chemistry?

Chemistry

2 answers:

Ostrovityanka [42]4 years ago

8 0

C. How does a convention oven cook food?

Mars2501 [29]4 years ago

8 0

Answer:

How does a convection oven cook food?

Explanation:

In the world everything related to matter, its reaction, its production, the properties and the laws which govern the reactions and properties are considered in chemistry.

However for simplification we study the reactions or chemical change in chemistry and the physical interactions between heat or energy with matter in physics.

So the yeast make bread dough rise (due to oxygen), the dissolution of sugar faster in hot water, or peeled apples turn brown (oxidation) are chemical phenomenon.

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1.3188g of antacid is weighed and mixed with 75.00 mL of excess 0.1746 M HCl. The excess wcid required 27.20 mL of 0.09767 M NaO

a_sh-v [17]

The amount of CaCO₃ in the tablet : 0.5219 g

<h3>Further explanation</h3>

Reaction

1. CaCO₃(in antacid) + 2HCl⇒ CaCl₂+H₂CO₃

2. Titration ⇒ HCl+NaOH⇒NaCl+H₂O

Reaction 2

For titration :

M₁V₁.n₁=M₂V₂n₂(n=acid/base valence⇒NaOH/HCl=1)

mol HCl=mol NaOH = excess HCl

$\tt 27.2\times 0.09767=2.657~mlmol$

Reaction 1

mol HCl

$\tt 75\times 0.1746=13.095~mlmol$

Moles of HCl used (reacted with CaCO₃) :

initial HCl - excess HCl =

$\tt 13.095-2.657=10.438~mlmol=0.010438~mol$

From reaction 1 :

mol HCl : mol CaCO₃ = 2 : 1

$\tt mol~CaCO_3=\dfrac{1}{2}\times 0.010438=0.005219$

mass of CaCO₃ :

$\tt 0.005219\times 100~g/mol=0.5219~g$

6 0

3 years ago

Write a net ionic equation for the reaction that occurs when excess hydrochloric acid (aq) and barium sulfite (s) are combined.

Dennis_Churaev [7]

Balanced chemical reaction of hydrochloric acid and barium sulfite:

2HCl(aq) + BaSO₃(s) → BaCl₂(aq) + H₂O(l) + SO₂(g).

Balanced ionic reaction:

2H⁺(aq) + 2Cl⁻(aq) + BaSO₄(s) → Ba²⁺(aq) + 2Cl⁻(aq) + H₂O(l) + SO₂(g).

Net ionic reaction:

2H⁺(aq) + BaSO₄(s) → Ba²⁺(aq) + H₂O(l) + SO₂(g).

3 0

4 years ago

Read 2 more answers

Tris is a weak base. The basic form of tris can be written tris0 and the protonated (conjugate acid) form can be written tris. T

Arada [10]

Answer:

a) [Tris0] : [Tris] = 1 : 100

b) Range = 7.1 to 9.1

Explanation:

a) Calculation of ratio of the basic and the acidic forms of tris

pH of a buffer is calculate using Henderson-Hasselbalch equation

$pH = pKa+log\frac{Salt}{Acid}$

Conjugate acid of Tris dissociated as

$Tris \leftrightharpoons Tris0 + H^+$

For tris,

Salt or Basic form = tris0

Acid or Acidic form = Tris

pKa = 8.1

pH = 6.1

$pH = pKa+log\frac{Tris0}{Tris}$

$6.1 = 8.1+log\frac{Tris0}{Tris}$

$log\frac{Tris0}{Tris} = -2$

$\frac{Tris0}{Tris} = antilog (-2)$

$\frac{Tris0}{Tris} = 10^{-2}$

[Tris0] : [Tris] = 1 : 100

b) Range of Tris

Range of any buffer is:

From (pKa -1) to (pKa+1)

So, range of Tris is:

From (8.1 - 1) to (8.1 +1)

or from 7.1 to 9.1

8 0

3 years ago

Given that Kp = 3.5 x 10-4 for the reaction 2 CO(g) <=> C(graphite) + CO2(g), what is the partial pressure of CO2(g) at eq

spin [16.1K]

<u>Answer:</u> The partial pressure of carbon dioxide at equilibrium is 0.0056 atm

<u>Explanation:</u>

The given chemical equation follows:

$2CO(g)\rightleftharpoons C\text{ (graphite)}+CO_2(g)$

<u>Initial:</u> 4.00

<u>At eqllm:</u> 4.00-2x x x

The expression of $K_p$ for above reaction follows:

$K_p=\frac{p_{CO_2}}{(p_{CO})^2}$

The partial pressure of pure solids and liquids are taken as 1 in the equilibrium constant expression.

We are given:

$K_p=3.5\times 10^{-4}$

Putting values in above expression, we get:

$3.5\times 10^{-4}=\frac{x}{(4-2x)^2}\\\\x=0.0056,718.28$

Neglecting the value of x = 718.28 because equilibrium pressure cannot be greater than initial pressure

Partial pressure of $CO_2$ = 0.0056 atm

Hence, the partial pressure of carbon dioxide at equilibrium is 0.0056 atm

4 0

3 years ago

What energy transfers happen when you cook sausages on a camp fire burning wood?

Slav-nsk [51]

Endothermic energy is taking place. The sausage is being heated by the fire and absorbing the thermal energy.

6 0

3 years ago