Hi There!
Black powder is an explosive powder consisting of saltpeter, sulfur, and charcoal, used chiefly in old guns fired for sport, in fireworks, and for spotting charges in practice bombs; black gunpowder.
In addition to being easily ignited by friction and impact, black powder is also extremely sensitive to flame and spark. It ignites violently when unconstrained and explodes when lit in even the slightest amount of confinement.
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Eddie
Which of the following materials is the least porous?
loosely packed gravel
unsorted sand and rock
large pebbles and boulders
sorted sand and rock
Answer:
The answer is The unsorted sand and rock is the least porous.
Answer:
large pebbles and boulders
If the energy difference between two electronic states is 214.68 kJ / mol , calculate the frequency of light emitted when an electron drops from higher to lower state. Planck's constant , h = 39.79 × 1/10¹⁴ kJ sec per mol .
[tex] {\qquad\qquad\huge\underline{{\sf Answer}}} [/tex]
Here we go ~
Energy difference btween the two electronic states can be expressed as :
[tex]{ \qquad \sf \dashrightarrow \: \Delta E = h\nu} [/tex]
[ h = planks constant,[tex]{\: \nu } [/tex]= frequency ]
[tex] \qquad \sf \dashrightarrow \:214.68 = 39.79 \times 10 {}^{ - 14} \times \nu[/tex]
[tex]\qquad \sf \dashrightarrow \: \nu = \cfrac{214.68}{39.79 \times 10 {}^{ - 4} } [/tex]
[tex]\qquad \sf \dashrightarrow \: \nu = \cfrac{214.68}{39.79 } \times 10 {}^{14} [/tex]
[tex]\qquad \sf \dashrightarrow \: \nu \approx 5.395 \times10 {}^{14} \:\:hertz[/tex]
When potassium permanganate is stirred in water, it turns to purple. How would
you describe whether this mixture is a suspension or a solution?
If you burn 9.1 L of octane gas (C8H18), how many liters of steam will you produce?
From the stoichiometry of the reaction, the volume of the steam produced is 82.9 L
What is combustion?The term combustion is the term that is used to describe the kind of reaction that occurs when a substance is being burnt in oxygen. It is an oxidation reaction and the octane is burnt to produce carbon dioxide and steam.
We can try to write down the equation of the reaction as follows;
2C8H18(g) + 25O2(g) ------> 16CO2(g) + 18H2O(g)
Now 1 mole of octane gas occupies 22.4 L
x moles of octane gas occupies 9.1 L
x = 9.1 L * 1 mole /22.4 L
x = 0.41 moles
Now;
2 mole of octane gas produces 18 moles of steam
0.41 moles of octane gas produces 0.41 moles * 18 moles/2 mole
= 3.7 moles
1 mole of steam occupies 22.4 L
3.7 moles of steam occupies 3.7 moles * 22.4 L/1 mole
= 82.9 L
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What is an alkaline
Answer:
is a solution whose pH is above 7or is a basic solution
Identify the type of compound that would have the following properties?
Conducts electricity when melted or dissolved in water.
High Melting Point
Usually a Solid
Group of answer choices
A. Ionic
B. Metallic
C. Covalent
D. Molecular
Answer:
The correct answer is A
Explanation:
Ionic compounds conduct electricity when molten (liquid) or in an aqueous solution because their ions are free to move from place to place
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which water boils can be related to the weather.
Quick boiling of water can be related to the hot weather because in high temperature water changes from liquid state to gaseous state.
Which water boils can be related to the weather?Water boils quickly when the weather is hot and warm because hot weather has high temperature which leads to the quick evaporation of the water. In hot weather, the liquid water changes into vapor state very quickly as compared to cold temperature.
So we can conclude that Quick boiling of water can be related to the hot weather because in high temperature water changes from liquid state to gaseous state.
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If a 66.5 g sample of ammonium nitrate (NH4NO3) is dissolved in enough water to make 315 mL of solution, what will be the molarity (M)?
Answer:
2.64 M
Explanation:
To find the molarity, you need to (1) convert grams to moles (via molar mass), then (2) convert mL to L, and then (3) calculate the molarity (via molarity ratio). The final answer should have 3 sig figs to match the sigs figs of the given values.
(Step 1)
Molar Mass (NH₄NO₃): 2(14.007 g/mol) + 4(1.008 g/mol) + 3(15.998 g/mol)
Molar Mass (NH₄NO₃): 80.04 g/mol
66.5 grams NH₄NO₃ 1 mole
--------------------------------- x ---------------------- = 0.831 moles NH₄NO₃
80.04 grams
(Step 2)
1,000 mL = 1 L
315 mL 1 L
-------------- x ------------------ = 0.315 L
1,000 mL
(Step 3)
Molarity = moles / volume
Molarity = 0.831 moles / 0.315 L
Molarity = 2.64 M
A mixture of 0.600 mol of bromine and 1.600 mol of iodine is placed into a rigid 1.000-L container at 350°C.
Br2(g) + I2(g) ↔ 2IBr(g)
When the mixture has come to equilibrium, the concentration of iodine monobromide is 1.190 M. What is the equilibrium constant for this reaction at 350°C?
The equilibrium constant for this reaction at 350°C is determined as 5.85.
Concentration of each componentconcentration of bromine, C(Br) = 0.6 mol/1 = 0.6
concentration of iodine, C(I) = 1.6 mol/1 = 1.6
Create an ICE tableWhat is ICE table?An ICE table is a tabular system of keeping track of changing concentrations in an equilibrium reaction.
ICE is an abbreviation that stands for initial, change, equilibrium.
Create ICE table for the reactants and products formed;
Br2(g) + I2(g) ↔ 2IBr(g)
I 0.6 1.6 0
C -1.19 -1.19 1.19
E 0.6 - 1.19 1.6 - 1.19 1.19
E = -0.59 0.41 1.19
Equilibrium constantThe equilibrium constant is calculated as follows;
KC = [IBr]²/[Br][I]
KC = (1.19²) / (0.59 x 0.41)
KC = 5.85
Thus, the equilibrium constant for this reaction at 350°C is determined as 5.85.
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The energy required for the hypothetical reaction
2A+B⇌2C+2D
is 309 kJ as written.
How much heat is absorbed when 2.60 mol of A reacts?
Express your answer to three significant figures and include the appropriate unit.
Answer:
402 kJ
Explanation:
Because the energy of the reaction is positive, the reaction is endothermic. This means energy is a reactant.
You can determine how much energy/heat is absorbed using the balanced chemical equation. You can convert the moles A using the ratio composed of the coefficient in front of A and the energy required for each reaction.
2A + B + 309 kJ ⇌ 2C + 2D
2.60 moles A 309 kJ
---------------------- x -------------------- = 402 kJ
2 moles A
If 1.240g of carbon dioxide dissolves in 1.01L of water at 755mmHg, what quantity of carbon dioxide in grams will dissolve at 790mmHg?
Taking into account the Henry's Law, 1.297 g carbon dioxide will dissolve at 790 mm Hg in 1.01 L water.
Henry's LawA change in pressure does not appreciably influence the solubility of solids or liquids or liquids in liquids; however, that of gases in solvents increases when the partial pressure of the gases increases. The solubility of a gas depends on pressure and temperature.
In this way, Henry's Law describes the effect of pressure on the solubility of gases. This law states that the solubility of a gas in contact with the surface of a liquid at a given temperature is directly proportional to the partial pressure of said gas on the liquid.
Mathematically, Henry's law is expressed as:
C=k×P
Where:
P is the partial pressure of the gas.C is the concentration of the gas.k is Henry's constant, which depends on the nature of the gas, the temperature, and the liquid.At 2 different partial pressure values, the Henry's law is expressed as:
[tex]\frac{C1}{C2} =\frac{P1}{P2}[/tex]
Quantity of carbon dioxideIn this case, you know:
C₁ = [tex]\frac{1.240 g}{1.01 L}[/tex] =1.228 [tex]\frac{g}{L}[/tex]C₂ = ?P₁ = 755 mm HgP₂ = 790 mm HgReplacing in Henry's Law:
[tex]\frac{1.228\frac{g}{L} }{C2} =\frac{755 mmHg}{790mmHg}[/tex]
Solving:
[tex]1.228\frac{g}{L} =\frac{755 mmHg}{790mmHg}xC2[/tex]
C2= [tex]\frac{1.228\frac{g}{L} }{\frac{755 mmHg}{790mmHg}}[/tex]
C2= 1.285 [tex]\frac{g}{L}[/tex]
Then, the concentration of carbon dioxide at 790 mmHg is 1.285 g/L. But you have 1.01 L of water. So the amount of gas dissolved can be calculated as 1.01 L×1.285 g/L = 1.297 g
Finally, 1.297 g carbon dioxide will dissolve at 790 mm Hg in 1.01 L water.
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7. What is the name of an element with 3 protons and 5 neutrons?
Answer: Lithium - 8
Answer:
Lithium-8
Explanation:
The atom with three protons and five neutrons that has a mass number of eight is known as lithium-8.
whats 21-4/1002-730+83920/839
The answer will be - 1.67 x [tex]10^{-6[/tex]
Mathematical operationsThe problem can be solved by using the rule of BODMAS.
21-4/1002-730+83920/839
First, the operation is divided into 3 parts
21-41002-730+83920839For the first part:
21 - 4 = 17
For the second part:
1002-730+83920
According to BODMAS, addition operations come before subtractions.
So, the operation becomes (1002)-(730+83920)
= (1002) - (84650)
= -83648
The entire operation becomes 17/-83648/839
17/-83648 x 1/839 = -17/70180672
= - 1.67 x [tex]10^{-6[/tex]
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At the equivalence point of a titration of the [H+] concentration is equal to:
Group of answer choices
A. 1 x 107 M
B. 7
C. [OH-]
D. 1 x 10-7 M
B. At the equivalence point of a titration of the [H+] concentration is equal to 7.
What is equivalence point of a titration?The equivalence point of a titration is a point in titration at which the amount of titrant added is just enough to completely neutralize the analyte solution.
At the equivalence point in an acid-base titration, moles of base equals moles of acid and the solution only contains salt and water.
At the equivalence point, equal amounts of H+ and OH- ions combines as shown below;
H⁺ + OH⁻ → H₂O
The pH of resulting solution is 7.0 (neutral).
Thus, the pH at the equivalence point for this titration will always be 7.0.
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A nitric acid solution that is 70.0% HNO3 (by mass) contains:
Question 8 options:
70.0 g HNO3 and 100.0 g water
70.0 mol HNO3
70.0 g HNO3 and 30.0 g water
70.0 g HNO3 and 70.0 g water
none of the above
Answer:
Correct answer is option C
70.0 g HNO3 and 30.0 g water
The equilibrium constant for reaction (1) below is 276. Under the same conditions, what is the equilibrium constant of reaction (2) ? (Think about the basic definition !)
(1) 1/2 X2(g) + 1/2 Y2(g) ↔ XY(g)
(2) 2XY(g) ↔ X2(g) + Y2(g)
The equilibrium constant of the reaction is 76176.
What is the equilibrium constant?In chemistry, the equilibrium constant is used to show the extent to which we can convert reactants to products in a given chemical process. A large value of the equilibrium constant shows that most of the reactants are converted into products under the given conditions. A small value of the equilibrium constant shows that most of the reactants are not converted into products.
Thus, if we have the reactions;
(1) 1/2 X2(g) + 1/2 Y2(g) ↔ XY(g)
(2) 2XY(g) ↔ X2(g) + Y2(g)
It then follows that;
K1 = [XY]/[X2]^1/2 [Y2]^1/2
K2 = [XY]^2/[X2] [Y2]
It is clear that;
K2 = (K1)^2
K2 = (276)^2
K2 = 76176
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Write the balanced redox reaction Fe2+ and MnO4
Answer:
The balanced equation is 5Fe2++MnO-4+8H+→5Fe3++Mn2++4H2O .
Explanation:
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Answer:
5Fe2++MnO-4+8H+→5Fe3++Mn2++4H2O .
Explanation:
A 7.74 L balloon is filled with water at 3.88 atm. If the balloon is squeezed into a 0.23 L beaker and does NOT burst, what is the pressure of water in the balloon?
Answer:
131 atm
Explanation:
To find the new pressure, you need to use Boyle's Law:
P₁V₁ = P₂V₂
In this equation, "P₁" and "V₁" represent the initial pressure and volume. "P₂" and "V₂" represent the final pressure and volume. You can find the new pressure (P₂) by plugging the given values into equation and simplifying.
P₁ = 3.88 atm P₂ = ? atm
V₁ = 7.74 L V₂ = 0.23 L
P₁V₁ = P₂V₂ <----- Boyle's Law
(3.88 atm)(7.74 L) = P₂(0.23 L) <----- Insert values
30.0312 = P₂(0.23 L) <----- Simplify left side
131 = P₂ <----- Divide both sides by 0.23
The reaction of charcoal (carbon) and oxygen is sped up by grinding the charcoal into a fine powder. This is an example of:
Group of answer choices
A. All of the above
B. Increasing concentration to increase reaction rate
C. Increasing temperature to increase reaction rate
D. increasing surface area to increase reaction rate
Answer:
D
Explanation:
Grinding to a powder increases the surface area of the charcoal .
The reaction of charcoal (carbon) and oxygen is sped up by grinding the charcoal into a fine powder. This is an example of increasing surface area to increase reaction rate. Option D is the answer.
Reason for the grindingGrinding charcoal into a fine powder enhances its reactivity by increasing surface area. This finer texture promotes more frequent collisions between charcoal particles and oxygen molecules, facilitating faster chemical reactions.
The heightened contact points enable efficient utilization of reactants, optimizing resource consumption. Shorter diffusion paths within smaller particles expedite reactant diffusion, aiding quicker reaction rates.
Additionally, the augmented surface area promotes efficient heat transfer, crucial in reactions involving temperature changes.
Grinding charcoal amplifies the reaction rate by maximizing interaction opportunities, accelerating the conversion of charcoal and oxygen into products.
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The amount of heat transferred from an object depends on
Group of answer choices
A. The initial temperature of the object
B. All of the above
C. The specific heat of the object
D. The mass of the object
The amount of heat transferred from an object depends on the following;
The initial temperature of the object
The specific heat of the object
The mass of the object
Therefore, the answer is all of the above (option B).
What is heat?
Heat is the internal energy of a system in thermodynamic equilibrium due to its temperature.
The amount of heat absorbed or released by an object can be calculated using the following expression:
Q = m × c × ∆T
Where;
Q = quantity of heat
m = mass of object
c = specific heat capacity of object
∆T = change in temperature
Therefore, this suggests that amount of heat transferred from an object depends on the following;
The initial temperature of the object
The specific heat of the object
The mass of the object
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What is the structure of polypropylene
The Structure of polypropylene(C3H6)n is linear.
The chemical formula for polypropylene is (C3H6)n.It is a polymer with complex structure and also known as polypropene. Polypropylene is similar to polyethylene which belongs to polyolefin groups. Generally the polymers are synthesized from the polymerization process.What is polymerization?The process in which atom or small molecules joined together repeatedly to form a polymer with complex structure is called as polymerization.
The repeated unit of atom or small molecule is called monomer
Structure of polypropylenePolypropylene is synthesized from the polymerization of propylene which is the monomer unit.
It has a linear structure made of propylene hydrocarbon units.
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If an electron falls from the n = 2 to the n = 1 energy levels in a Hydrogen atom what wavelength of light is emitted?
Group of answer choices
A. 122 nm
B. 1024 nm
C. 97 nm
D. 103 nm
A. The wavelength of light that is emitted is 122 nm.
What is wavelength?
Wavelength is the distance between identical points (adjacent crests) in the adjacent cycles of a waveform signal propagated in space or along a wire.
Wavelength of light is emittedWhen an electron falls from the n = 2 to the n = 1 energy levels in a Hydrogen atom, the wavelength of light is emitted is calculated as follows;
¹/λ = R(1/n₁² - 1/n₂²)
¹/λ = 109677(1/1 - 1/2²)
¹/λ = 109677(1 - ¹/₄)
¹/λ = 82,257.25
λ = 1/8,225.25
λ = 1.22 x 10⁻⁵ cm
λ = 1.22 x 10⁻⁷ m
λ = 122 nm
Thus, the wavelength of light that is emitted is 122 nm.
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is there any methods to determine number of water crystallization?
Answer:
In the formula, we can see that for each unit of copper(II) sulfate, there are five molecules of water associated with it. One way to determine the amount of water of crystallization in a hydrated salt is to use volatilization gravimetry
Which element belongs to the p6-block of the periodic table?
Oalkaline earth metals
Ohalogens
alkali metals
Onoble gases
Question 21
Which of the following salts will produce an acidic solution?
K2CO3
Sr(CIO4)2
KBr
NH41
NaNO3
Answer:
NH4
Explanation:
its an acid duhhhhhhhhh
In the chemical reaction:
Cu + 2AgNO3 → 2Ag + Cu(NO3)2
What is the limiting reactant if you start with 1.8 moles of copper and 2.0 moles of silver nitrate?
Group of answer choices
A. copper (II) nitrate
B. copper
C. silver
D. silver nitrate
Answer:
d
Explanation:
d
Chromium metal can be produced by the following reaction:
3Si + 2Cr2O3 - 4Cr + 3SiO2
In an experiment where there is an excess of cr2o3, what mass (in grams) of cr can be produced from 0.250 moles of si?
Answer:
17.3 g Cr
Explanation:
To find the mass of chromium, you need to (1) convert moles Si to moles Cr (using the mole-to-mole ratio from equation coefficients) and then (2) convert moles Cr to grams Cr (using the atomic mass). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the sig figs of the given value (0.250).
3 Si + 2 Cr₂O₃ ---> 4 Cr + 3 SiO₂
^ ^
Atomic Mass (Cr): 51.996 g/mol
0.250 moles Si 4 moles Cr 51.996 g
------------------------- x -------------------- x ------------------- = 17.3 g Cr
3 moles Si 1 mole
QUESTION 16
What is the product of the following reaction?
+ H₂(g) → ?
Answer:
n2(g)+3h2(g)→2nh3(g) balanced
Explanation:
Wayne Breslyn
Select which of the following characteristics match with the correct state of matter.
No definite shape
Highly compressible
Definite volume
Low density
The gases have no definite shape, low density, and are highly compressible while the liquids only have a definite volume but no definite shape.
What is a Matter?Any substance which has mass and occupies space is called matter. Commonly, there are three states of matter that are:
Solid - Solids have a rigid shape, definite volume, and high density.Liquid - Liquids have definite volume but no definite shape. They take the shape of the container in which they are placed.Gas - Gases have neither definite shape nor definite volume and have low density. They completely occupy the container in which they are placed.There are other two states of matter that are Plasma and man-made Bose-Einstein condensates. They are not so common.
Plasma is commonly found in the universe. Stars are the superheated balls of the plasma.
Thus, gases have no definite shape, low density, and are highly compressible. On the other hand, the liquids only have a definite volume but no definite shape.
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A solution has a hydrogen ion concentration of [H+] = 4.6 x 10 -3 M.
What is the hydroxide ion concentration [OH-] of this solution?
Answer:
[OH⁻] = 2.2 x 10⁻¹²
Explanation:
(Step 1)
Calculate the pH.
pH = -log[H⁺]
pH = -log[4.6 x 10⁻³]
pH = 2.34
(Step 2)
Find the pOH.
pH + pOH = 14
2.34 + pOH = 14
pOH = 11.66
(Step 3)
Calculate the [OH⁻].
[OH⁻] = 10^(-pOH)
[OH-] = 10^(-11.66)
[OH⁻] = 2.2 x 10⁻¹²