This reaction is exothermic reaction and the q value is -484 kJ
An exothermic reaction is a chemical reaction that involves the release of energy in the form of heat or light
Here given reaction is
2H2(g) + O2(g) → 2H₂O(g)
In this reaction we can see that heat is released so if heat is released after completion of the reaction such reaction are called as exothermic reaction and thus given reaction is exothermic reaction
The fuel is hydrogen it react with oxygen from the air this is an exothermic reaction
So because of exothermic reaction ΔH = -ve
That why the q value is also negative so it is q = -484 kJ
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10. How many grams of KOH are needed to make a 2.00 M solution?
Answer: The mass of KOH needed is 28 grams
Explanation:
Molarity: It is defined as the number of moles of solute present in one liter of solution.
In this question, the solute is KOH.
The formula used: M = N/V
wb = mass of solute KOH = ?
mb = molar mass of solute KOH = 56 g/mole
V = volume of solution = 250 ml
Molarity = 2.00 M = 2.00 mole/L
Now put all the given values in the above formula, and we get the mass of KOH.
Now put all the given values in the above formula, and we get the mass of KOH.
Therefore, the mass of KOH needed is 28 grams.
Answer: 28 grams
Explanation:
2molarity/L= Mass of KOH/ 56g/molarity multiplied by 250ml multiplied by 1000 *Hope it helped*
What is the concentration of sodium ions in 0.130 M Na₂HPO₄?
The concentration of sodium ions in 0.130 M Na₂HPO₄ is 0.26 M.
The Na₂HPO₄ will dissociates in to ions we get :
Na₂HPO₄ ----> 2Na⁺ + HPO₄⁻
here from the above equation it is clear that,the 1 moles of Na₂HPO₄ produce the 2 moles of Na⁺ and 1 mole of Na₂HPO₄ will produce 1 mole of HPO₄⁻.
the concentration of Na⁺ = ?
concentration of the Na⁺ = 2 × Na₂HPO₄
concentration of the Na⁺ = 2 × 0.130 M
the concentration of the Na⁺ = 0.26 M
Thus, The concentration of sodium ions in 0.130 M Na₂HPO₄ is 0.26 M.
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Part 1: Name the type of chemical reaction that occurs when magnesium chloride solution (MgCl2) reacts with sodium carbonate solution (Na2CO3).
Part 2: Explain why aluminum (Al) would react with copper chloride (CuCl2) but not with magnesium chloride (MgCl2).
a) The reaction between magnesium chloride solution and sodium carbonate solution is a displacement reaction
b) Aluminum is above copper but below magnesium in the electrochemical series.
What is a displacement reaction?We know that a displacement reaction is the kind of reaction that occurs between two substances which involves an exchange of radicals. Now we know that a reaction would certainly produce a new kind of chemical substances.
A displacement reaction would occur if the substances that are involved in the reaction are far apart in the activity series. The metal that is more reaction would displace the metal that is less reactive from its salt.
Given the fact that sodium is higher than magnesium in the electrochemical series, then magnesium can be displaced from its solution by sodium
In part 2, the aluminum metal is ahead of copper in the electrochemical series hence aluminum is able to displaces copper from its solution but it is unable to displace magnesium from its solution because magnesium is above aluminum in the electrochemical series.
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1. The reaction between magnesium chloride solution and sodium carbonate solution is a displacement reaction
2. Aluminum is above copper but below magnesium in the electrochemical series.
Can you please help to learn more about chemical bonding cause I’m having a hard time learning it.
Answer:
Chemical bonding is the process by which atoms are held together to form molecules. The bond between atoms is created by the sharing of electrons. The electrons are attracted to the nucleus of the atoms, which creates a force that holds the atoms together.
The question is in picture below, help!
Answer: What are the answer choices?
Explanation: I need answer choices to see, there are a lot of definitions, verbs and nouns for an answer.
Of the following, a 0.1 M aqueous solution of ________ will have the lowest freezing point
Answer:
2
Explanation:
You have 505 mL of a 0.140 M HCl solution and you want to dilute it to exactly 0.100 M. How much water should you add?
The volume of water that should be added in the given solution is equal to 202 ml.
What is the dilution law?The concentration or the volume of the dilute or concentrated solution can be calculated from the following equation:
M₁V₁ = M₂V₂
where M₁, V₁, M₂, and V₂ are the concentration and volume of the concentrated solution and dilute solution respectively.
Given, the concentration of the solution, M₁ = 0.14 M
The concentration of the diluted solution, M₂ = 0.100 M
The volume of concentrated solution, V₁ = 505 ml
Put the value of the molarity and volume in equation (1):
(0.140)× (505) = (0.100) × (V₂)
V₂ = 707 ml
The amount of water should be added = 707 - 505 = 202 ml
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How are nuclear reactions different from chemical reactions?
Nuclear reactions involve a change in an atom's nucleus, usually producing a different element. Chemical reactions, on the other hand, involve only a rearrangement of electrons and do not involve changes in the nuclei. Different isotopes of an element normally behave similarly in chemical reactions.
I hope this helps!
What is the shielding constant of phosphorus?
Answer: shielding constant is +20.494 ppm for σ(P) and À0. 221 ppm for σ(H).
Arsenic is in the same family as this element that has a mass of 14.
Answer:
below
Explanation:
From periodic table:
Arsenic is a metalloid in the family with Silicon (Si) which has a mass of 14
The following reaction takes place: 2K + 2H20 ---> 2KOH + Hz
a. Calculate the number of moles of hydrogen that will be produced if 11.5 g of potassium are reacted.
b. Calculate the number of grams of hydrogen that will be produced in this same reaction.
As per the balanced reaction, 2 moles of potassium gives 2 moles of hydrogen molecules. Thus 11.5 g or 0.302 mol will produce 0.302 moles of hydrogen. The mass of 0.302 mol of hydrogen is 0.604 g.
What is hydrolysis ?Hydrolysis is the reaction of a substance with water to form hydroxides or hydrides. The given reaction is hydrolysis of potassium giving 2 moles of H2.
The atomic mass of potassium is 38 g/mol. Thus the mass of 2 mole of potassium is 38 × 2 = 76 g. The number of moles in 11.5 g K is 0.302 moles. 2 moles of potassium gives 2 moles of H2, thus 0.302 moles gives 0.302 moles of H2.
The molecular mass of H2 is 2 g/mol. Thus mass of 0.302 moles is 0.302 × 2 = 0.604 g.
Hence, the mass in grams of hydrogen produced is 0.604 g.
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Which of the following animals are an example of coevolution? *
Acacia ant and acacias animals are an example of coevolution
Coevolution is the reciprocal evolutionary change in a set of interacting population over time resulting from the interaction between those population and an example of coevolution that is not characteristics of an arm race but one which provides a mutual benefit to both a plant species and insect is that of the acacia ant and acacia plant and many cases of coevolution can be found between plants and insects
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PLEASE HELP I LAREADY FAILED ONCE
What is the mass of 6.02 x 10^^24
molecules of hydrogen, H2? The molar
mass of H2 is 2.02 g/mol.
A- 2.02 g H2
B- 2.98 x 10^24 g H2
C- 10.0 g H2
D- 1.22 x 10^25 g H2
Answer: a
Explanation:
2. What kinds of events develop over oceans?
O avalanches
O hurricanes
O landslides
O solar flares
If 96.3 g of A1203 decomposed, determine the percent yield of 02 if you
isolated 43.2 g 02.
2Al₂O3 →4A1+30₂
Your answer
25 points
2
I need answer asap
If actual yield and theoretical yield are same then the percent yield will be 100%. Generally, the actual yield is lower than the theoretical yield. The percent yield of 0₂ is 93%.
What is percent yield?Percent yield is the percent ratio of actual yield to the theoretical yield.
Mathematically,
Percent yield= actual yield of a product÷ theoretical yield of the product
The balanced reaction is
2Al₂O₃ →4A1+30₂
moles of Al₂O₃=given mass÷ molar mass
=96.3 g ÷100g/mol
=0.96moles
From 2 mole of Al₂O₃, 3 moles of 0₂ is produced
From 0.96moles of Al₂O₃=(3÷2)×0.96moles of 0₂
=1.44moles of 0₂
mass of 0₂=moles of 0₂×Molar mass of moles of 0₂
mass of 0₂=1.44×32
=46.08g
Percent yield= 43.2 g÷46.08g=93%
Therefore the percent yield of 0₂ is 93%.
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Carbon dioxide formation
Carbon dioxide is generated when any substance that contains carbon is burned. It is also a product of respiration and fermentation. Plants absorb carbon dioxide during photosynthesis.
What is the pH of a solution that has [H3O+] = 6.0 x 10-³ M?
Answer:
2.2
Explanation:
What are the four possible sub levels an electron can occupy?
Four possible sub levels an electron can occupy are s, p, d, f
A level that is lower than or subordinate to another level called as sublevel and electron fill principal energy level or shell to have lowest possible energy and within the shell they also fill the sublevel are s,p,d,f to have the lowest energy and so electron in orbital in the s sublevel called s orbital and have less energy than those in p sublevel and the s sublevel has just one orbital and so can contain 2 electron maximum and the p sublevel has 3 orbital and so can it contain 6 electron maximum and in d 5 orbital and it contain 10 electron and f has 7 orbital and it contain 14 electron maximum
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A weather balloon has a volume of 556 L when filled with helium at 30 C at a pressure of 386 torr. What is the new volume of the balloon (in liters) if the balloon rises to a point where the air
pressure is 229 torr and the temperature is -9 C
The new volume of the balloon will be 484.43 L.
This is an example of Charles' law, sometimes called the temperature-volume law. It states that the volume of a gas is directly proportional to the Kelvin temperature, while pressure and amount are held constant.
The equation is V1/T1=V2/T2, where V is volume and T is temperature in Kelvins.
Known
V1=556 L
T1=30∘C+273.15=303 K
T2=-9∘C+273.15=264 K
Unknown
V2
Solution
Rearrange the equation to isolate V2. Substitute the known values into the equation and solve.
V2=V1T2/T1
V2=(556L×264K)/303K=484.43 L.
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Is copper a fcc or bcc?
Answer: copper is a fcc.
Explanation:
Solid copper can be described as the arrangement of copper atoms in a face-centered-cubic (fcc) configuration.
Solid copper can be described as the arrangement of copper atoms in a face-centered-cubic (fcc) configuration.
Two of the most recognizable crystal shapes are face-centered cubics (FCC) and body-centered cubics (BCC). There are FCC, BCC, or HCP structures for almost all elements.
The atomic configurations are where FCC and BCC crystals diverge most drastically. All 8 corner positions and the centers of each of the six faces are occupied by atoms in the face-centered cubic structure. All eight corner positions and the cube's center are occupied by atoms in the body-centered cubic structure.
Compared to BCC metals, FCC metals are often more ductile, more stable at high temperatures, and more dense. This is a result of their packaging design and slip systems.
The most effective atomic configuration is found in FCC (tied with HCP).
Because of this, we refer to FCC as a "close-packed" structure. FCC metals will typically be more dense and stable because FCC atoms are grouped more tightly together than BCC atoms.
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What is the maximum number of electrons that the 3d sublevel can hold?
A flask with a volume of 125.0 mL contains air with a density of 1.241 g/L.What is the mass of the air contained in the flask?
Answer:
Below
Explanation:
125 ml = .125 L
.125 L * 1.241 g/ L = . 155 g
Predict a product of the following reaction:
Al + CuCl2→
Answer:
CuCl2 + Aluminum = Chemical / Physical change
How many grams of calcium are in 3.01 x 1022 atoms of calcium?
The amount, in grams, of calcium that are in 3.01 x [tex]10^{22[/tex] atoms of calcium would be 1.9992 grams.
Avogadro's numberAccording to the rules, 1 mole of any substance contains Avogadro's number, which is 6.022 x [tex]10^{23[/tex] atoms or molecules.
Now, we have a substance with 3.01 x [tex]10^{22[/tex] atoms of calcium.
If, 1 mole = 6.022 x [tex]10^{23[/tex] atoms
Then, 3.01 x [tex]10^{22[/tex] atoms = 3.01 x [tex]10^{22[/tex]/ 6.022 x [tex]10^{23[/tex]
= 3.01/60.22
= 0.04998 moles
Recall that:
Mole = mass/molar mass
The molar mass of the calcium atom is 40 g/mol.
Thus, the mass of 0.04998 mole of calcium = mole x molar mass
= 0.04998 x 40
= 1.9992 grams
In other words, 3.01 x [tex]10^{22[/tex] atoms of calcium would weigh 1.9992 grams of ca.
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If an element is bonded to 4 other atoms and has a formal charge of +1, what group must the element be in?
A) 5A
B) 6A
C) 7A
D) 3A
E) 4A
What is kintec energy?
Arrange the following transitions in from most energy absorbed to most energy emitted.
n=3 <— n=5
n=1 —> n=3
n=2 —> n=4
n= 2 <— n=4
n=3 <— n=5, n= 2 <— n=4 are most energy emitted and n=1 —> n=3, n=2 —> n=4 are most energy absorbed
In chemistry, energy is the capacity to carry out work. It may take on a variety of shapes, including potential, kinetic, thermal, electrical, chemical, radioactive, etc. Heat and labor are other examples of energy being transferred from one body to another. Once it has been transported, energy is always allotted according to its kind. Thus, heat transmission might manifest as thermal energy, but work could produce mechanical energy.
All energy kinds have the characteristic of motion. For instance, a body has kinetic energy if it is moving. A tensioned item, such as a spring or bow, has the capacity to move even while at rest; this property results from the design of the object, which incorporates potential energy.
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In a lab you test the properties of a substance. The substance is a solid, with
a dull appearance. It does not conduct electricity but will dissolve in water.
When hit with a hammer it shatters into pieces. Which structure would you
predict this substance to have?
Answer: Glass or plastic
Explanation:
Because they both are able to shatter hehehhe ;)))))))
A protein subunit from an enzyme is part of a research study and needs to be characterized. A total of 0.135 g of this subunit was dissolved in enough water to produce 2.00 mL of solution. At 28 ∘C the osmotic pressure produced by the solution was 0.138 atm . What is the molar mass of the protein?
The molar mass of the protein under the conditions that we have in this question can be obtained to be 12065 g/mol.
What is the molar mass of the protein?We know that the osmotic pressure is one the colligative properties of the solution. The colligative properties are the properties that depend on the amount of substance that is present in the solution.
Mass of the protein = 0.135 g
Volume of the solution = 2.00 mL
Temperature of the system = 28 ∘C + 273 = 301 K
Osmotic pressure of the solution = 0.138 atm
We can get the osmotic pressure from;
π = iCRT
π = Omotic pressure
i = Van't Hoff factor
C = concentration of the solution
R = gas constant
T = temperature
Let the molar mass of the protein be M
0.138 = 1 * 0.135/M/0.002 * 0.082 * 301
0.138 = 1 * 0.135/0.002M * 0.082 * 301
0.138 = 3.33/0.002M
0.138 * 0.002M = 3.33
M = 3.33/0.138 * 0.002
M = 12065 g/mol
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1 According to the law of conservation of mass, the total mass of the reacting substances is
A always more than the total mass of the products.
B always less than the total mass of the products.
C sometimes more and sometimes less than the total mass of the products.
D always equal to the total mass of the products.
According to the law of conservation of mass, the total mass of the reacting substances is
A. always more than the total mass of the products.
B. always less than the total mass of the products.
C. sometimes more and sometimes less than the total mass of the products.
D. always equal to the total mass of the products.
This is the one that I would have to choose.
Hope this helps:)