Answer:
Atoms form chemical bonds to make their outer electron shells more stable. The type of chemical bond maximizes the stability of the atoms that form it. ... Covalent bonds form when sharing atoms results in the highest stability. Other types of bonds besides ionic and covalent chemical bonds exist, too.
What is the new concentration of a solution after 250mL of 2.5M sulfuric acid is diluted to a final volume of 700mL?
Please show your work
Answer:
The new concentration of the solution is 0.89 M.
Explanation:
In chemistry, dilution is the reduction in concentration of a chemical in a solution. This is accomplished by adding more solvent to the same amount of solute.
So, in a dilution, the amount of solute does not vary, but the volume of the solvent varies: as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.
In a dilution the expression is used:
Ci*Vi = Cf*Vf
where:
Ci: initial concentration Vi: initial volume Cf: final concentration Vf: final volumeIn this case:
Ci= 2.5 M Vi= 250 mLCf=? Vf= 700 mLReplacing:
2.5 M* 250 mL= Cf* 700 mL
Solving:
[tex]Cf=\frac{2.5 M*250 mL}{700 mL}[/tex]
Cf= 0.89 M
The new concentration of the solution is 0.89 M.
A sample of an unknown metal has a mass of 120.4 g. As the sample cools from 90.5°C to 25.7°C, it releases 7020 J of energy. Usinf the chart below, what is the identity of the metal in the sample? Hint Calculate specific heat first Substance Specific Heat Water (liquid) 4.184 J/g °C 0.899 J/g °C 0.803 J/g °C 0.449 J/g °C a) Aluminum ) b) Granite Oc) Water d) Iron
Answer:
Explanation:
sheesh i wouldn’t know
How much energy is released when 75g of liquid water is reduced from 65c to 0c and completely freezes?
Answer:
Q = 20377.5 Joules
Explanation:
Given the following data;
Mass = 75g
Initial temperature = 65°C
Final temperature = 0°C
Specific heat capacity of water = 4.18 J/g°C.
To find the quantity of heat released;
Heat capacity is given by the formula;
[tex] Q = mcdt[/tex]
Where;
Q represents the heat capacity or quantity of heat.
m represents the mass of an object.
c represents the specific heat capacity of water.
dt represents the change in temperature.
Substituting into the equation, we have;
[tex] Q = 75 * 4.18 * 65 [/tex]
Q = 20377.5 Joules
how to calculate the mass percent of hydrogen
Answer:
divide the mass of element in 1 mole of the compound by the compound's molar mass and multiply the answer by 100.
Explanation:
take the molar mass of hydrogen in the water molecule, divide by the total molar mass of water, and multiply by 100.
does it help?
Zn + 2HCl → ZnCl2 + H2
How many moles of hydrogen are produced from the reaction of
6.0 moles of zinc?
Answer:
6
Explanation:
6.0mol ( 1 mol H2/ 1 mol Zn ) = 6.0 mol of H2
H2 is hydrogen gas (hydrogen in the air).
4) The equilibrium constant, Kc, is 3.2 x 10-34 at 25 °C for the reaction represented
below.
2 HCl(g) = H2(g) + Cl2(g)
a. Write the equilibrium expression, Kc, for the reaction.
b. Suppose you start out with only reactants in a rigid container at 25°C. The
initial concentration of HCl(g) is measured to be 0.375 M. What are the
concentrations of each gas when the system reaches equilibrium?
Answer:
a. Kc = [H2] [Cl2] / [HCl]²
b. [H2] = 6.7x10⁻¹⁸M
[Cl2] = 6.7x10⁻¹⁸M
HCl ≈ 0.375M
Explanation:
a. The expression, Kc, is defined as the ratio of the concentrations of the products over reactants powered to its coefficients. For the reaction, Kc is:
Kc = 3.2x10⁻³⁴ = [H2] [Cl2] / [HCl]²b. If you start with a concentration of HCl of 0.375M, the concentrations in equilibrium are:
[H2] = X
[Cl2] = X
[HCl] = 0.375M - 2X
Where X is reaction coordinate
Replacing:
3.2x10⁻³⁴ = [X] [X] / [0.375M - 2X]²
3.2x10⁻³⁴ = X² / 0.140625 - 1.5 x + 4 X²
4.5x10⁻³⁵ - 4.8x10⁻³⁴X + 1.28x10⁻³³X² = X²
4.5x10⁻³⁵ - 4.8x10⁻³⁴X - X² = 0
Solving for X:
X = -6.7x10⁻¹⁸. False solution, there is no negative concentrations
X = 6.7x10⁻¹⁸M
Thus:
[H2] = 6.7x10⁻¹⁸M
[Cl2] = 6.7x10⁻¹⁸M
HCl ≈ 0.375M
The correct Answer is:
Answer a. Kc = [H2] [Cl2] / [HCl]²
Answer b. [H2] = 6.7x10⁻¹⁸M
Then [Cl2] = 6.7x10⁻¹⁸M
Now, HCl ≈ 0.375M
Explanation:a. When The first expression, Kc, is defined as the ratio of the concentrations of the products that will be over reactants powered to its coefficients. For the reaction, Kc is:
After that Kc = 3.2x10⁻³⁴ = [H2] [Cl2] / [HCl]²b. When If you start with a concentration of HCl of 0.375M, so that, concentrations in equilibrium are:
After that [H2] = X Now, [Cl2] = X So that, [HCl] = 0.375M - 2X Where X is reaction coordinate After that the Replacing: 3.2x10⁻³⁴ = [X] [X] / [0.375M - 2X]² 3.2x10⁻³⁴ = X² / 0.140625 - 1.5 x + 4 X² 4.5x10⁻³⁵ - 4.8x10⁻³⁴X + 1.28x10⁻³³X² = X² 4.5x10⁻³⁵ - 4.8x10⁻³⁴X - X² = 0 After Solving for X that is: Then X = -6.7x10⁻¹⁸. False solution, there is no negative concentrations Then X = 6.7x10⁻¹⁸M Thus that: When [H2] = 6.7x10⁻¹⁸M When [Cl2] = 6.7x10⁻¹⁸M Then HCl ≈ 0.375MLearn more about:
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If an object is on top of a hill or in a position raised above the ground, it must have __________.
Answer:
The force applied to the object is an external force, from outside the system. When it does positive work it increases the gravitational potential energy of the system. Because gravitational potential energy depends on relative position, we need a reference level at which to set the potential energy equal to 0.
If an object is on top of a hill or in a position raised above the ground, it must have gravitational potential energy.
What is Potential Energy ?
In physics, potential energy is the energy held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors
If an object is lifted, work is done against the force of gravity.
When work is done energy is transferred to the object and it gains gravitational potential energy.
If the object falls from that height, the same amount of work would have to be done by the force of gravity to bring it back to the Earth’s surface.
Due to the Principle of Conservation of Energy we can say that:
Gravitational potential energy at the top = kinetic energy at the bottom
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How many moles are in 15.3 grams of KNO3?
Answer:
0.151 mol
Explanation:
molar mass of KNO3 = (39.1 + 14 + 3×16) g/mol = 101.1 g/mol
number of moles = mass/molar mass
n = m/M = 15.3 g/(101.1 g/mol) = 0.151 mol
Name the following alkyne:
A. propane
B. propene
C. propyne
D. methyne
The name of the alkyne which is given in the question with structure is propyne as in that 3 carbon atoms are present.
What are alkynes?Alkynes are those hydrocarbons in which triple bond is present between two adjacent carbon atoms.
In the given structure one triple bond is present between first two carbon atoms and then with this a single bonded carbon atom is also attached. As in the structure total three carbon atoms are present so prefix shoul be 'prop' and as this is an alkyne then name should be propyne.
Propane is wrong because it is used with single bonded hydrocarbons.Propene is also wrong as it is used with double bonded hydrocarbons.Methyne is also wrong as it is not a word that make any sesne.Hence name of compound is propyne.
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Propyne is the chemical name for the given alkyne. Therefore, the correct option is option C.
A triple bond exists between the carbon atoms in alkynes, a group of hydrocarbon molecules. They are given names based on the IUPAC (International Union of Pure and Applied Chemistry) guidelines for systematic nomenclature. Alkyne nomenclature's primary objective is to provide each compound a precise and distinctive name that accurately captures its structure. Based on the quantity of carbon atoms, the placement of triple bonds, and the presence of functional groups, alkyne compounds are named systematically.
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The [OH-] of an aqueous solution is 3.5 x 10-5. What is the [H+]?
Answer: The concentration of hydrogen ion in the given solution is [tex]2.81 \times 10^{-10}[/tex].
Explanation:
pOH of a solution is the negative logarithm of concentration of hydroxide ions.
Hence, if [tex][OH^{-}][/tex] is [tex]3.5 \times 10^{-5}[/tex] then its pOH value is calculated as follows.
[tex]pOH = -log [OH^{-}]\\= -log (3.5 \times 10^{-5})\\= 4.45[/tex]
Now, the relation between pH and pOH is as follows.
pH + pOH = 14
pH + 4.45 = 14
pH = 14 - 4.45
= 9.55
And, pH is the negative logarithm of concentration of hydrogen ions. Hence, [tex][H^{+}][/tex] is calculated as follows.
[tex]pH = -log [H^{+}]\\9.55 = -log [H^{+}]\\H^{+} = 2.81 \times 10^{-10}[/tex]
Thus, we can conclude that the concentration of hydrogen ion in the given solution is [tex]2.81 \times 10^{-10}[/tex].
is sodium oxide an acidic oxide or a basic oxide
Answer:It a Basic oxide
Plz trust Me
Explanation:
Answer:
Sodium oxide is a simple strongly basic oxide. It is basic because it contains the oxide ion, O2-, which is a very strong base with a high tendency to combine with hydrogen ions. Reaction with water: Sodium oxide reacts exothermically with cold water to produce sodium hydroxide solution.
Explanation:
The specific heat of water is 4.184 J/g·K. How much energy must be added to 100.0 g of water to raise the temperature of water from 22.0 ºC to 90.0 ºC?
Answer:
10.9C digrey celsios and im sorry
Suppose you used a needle to poke two holes in a sealed tube of toothpaste. One hole near the cap and one hole is in the middle of the tube. You then squeeze the tube at the base. Compare how the toothpaste will leave each needle hole. Be sure to explain using theory, why this happens.
Answer:
done this before in my science class
Explanation:
the hole by the cap will have slightly more coming out at first due to all the toothpaste pushing forward, but over time, the middle will get more do to all the front end of the toothpaste being pushed out first
(sorry if that sounded confusing im tired, heres a cat)
The hole by the cap will have slightly more coming out at first due to all the toothpaste pushing forward, but over time, the middle will get more do to all the front end of the toothpaste being pushed out first.
What is toothpaste?Toothpaste is a key part of your daily oral hygiene routine. Along with your toothbrush and floss it helps to remove food debris and plaque from your teeth and gums.
Toothpastes can come in a gel, paste or powder form. While the ingredients differ slightly, all toothpastes contain the same general components.
With some help from your toothbrush, these help to remove debris and surface stains. This ingredient helps to prevent water loss, and keeps your toothpaste from drying out or getting gummy. This is what gives your toothpaste a little bit of sweetness, and that minty fresh scent. Since these do not contain sugar, they also do not promote tooth decay.
Therefore, The hole by the cap will have slightly more coming out at first due to all the toothpaste pushing forward, but over time, the middle will get more do to all the front end of the toothpaste being pushed out first.
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Describe how you could show that a compound is an acid
1. How do scientific investigations begin?
conclusion
inquiry
testing
hypothesis
Answer:
Hypothesis is the answer
What biological molecule that is used for energy is represented by the structure below?
Answer:
Glucose. C6H12O6
Explanation:
In aerobic respiration glucose generate ATP. Which are the source of energy.
According to collision theory, which of the following statements explain why an increase in temperature increases the rate of a chemical reaction? (Select all that apply.)
Answer:
The reactant particles have a greater average kinetic energy.
A smaller fraction of the reactant particles have energy greater than the Ea.
How is a TV like our brain?
Answer:
Explanation:
Because your brain and the TV are programed to do certain things. As if you're going back into a memory, and you're simply rewatching a season of Beyblade: Metal Fusion on the TV.
.What is the significance of genetic variation within the population of moths during and after the Industrial Revolution in London?
Answer:
The evolution of the peppered moth is an evolutionary instance of directional colour change in the moth. The frequency of dark-coloured moths increased at that time, an example of industrial melanism.
Explanation:
I did this on Savvas Realize got it right.
Genetic variation is said to be the difference in the hereditary sequence. After the industrial revolution, the frequency of the dark-colored moth increased dramatically more than the light-colored moths.
What is industrial melanism?
Industrial melanism was an example of the evolutionary effect that occurred in the moths where the dark-colored species were favored over the light-colored species of peppered moths.
Before the industrial population, light-colored moths were large in number which later decreased with an increase in pollution. This occurred due to an increase in the pollutants and dust deposition that altered the environment.
As the pollution increased over time the dark-colored moths became dominant and increased their population over time. This is an example of industrial melanism as the color of the body was the determining factor in survival.
Therefore, dark-colored moths were prevalent after the industrial revolution.
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helium gas (He) effuses ___ times faster than methane (CH4)
a. 1.80
b. 2.00
c. 2.20
d. 2.40
Answer:
b 2.00
Explanation:
I am pretty sure that is right
Which is not an example of a
parasite/host relationship?
A flea on a dog
A tick on a horse
A toad on a lily pad
A barnacle on a whale
Answer:
A toad on lily pad
Explanation:
have a great day
Please help me!!!! I will give you brainliest!!!
Answer:
A and C
Explanation:
I think it's A and C but I could be wrong
The decomposition of water into hydrogen gas Hy and oxygen gas Oz can be modeled by the balanced chemical equation
A)
H2 + 02 - H20
B)
H20 - H2 + O2
C) 2H2 + 02 - 2H20
D)
2H20 - 2H2 + O2
Answer:
D. ) 2H2O - 2H2 + O2
The specific heat of lead is 0.129 J/gC. Find the amount of heat released when 2.4 moles of lead are cooled from 37.2C to 22.5C.
Answer:
-943J or 943J released
Explanation:
m=2.4 mol x 207.g/ mol=497.3g
c=.129 J/gC
T= T f-Ti=(22.5-37.2)=-14.7C
Q=?
Q=(49.3g)(.129 J/g C) (-14.7 C)
= -943 J or 943 J released
gu khayo bhana m hunxa hola
Answer:
[tex] \huge\pink{\boxed{\mathfrak{Hola}}}[/tex]
I didn't understand the rest of your question, it's not in English or Spanish.
[tex]\huge\fbox{HôLLa}[/tex]
What is the molar mass of Fe(NO3)2?
Answer:
Explanation:
179.8548 g/mol
The total mass of all the atoms that make up a mole of a specific molecule, measured in grams, is known as the molar mass or molecular weight. Here the molar mass of Fe(NO₃)₂ is 179.87 g/mol.
One mole of any substance has a mass known as a molar mass. An amount that has a mass equal to its atomic or molecular mass in grams is referred to as a mole of any species (atoms, molecules, ions, or particles). The letter "M" stands for molar mass.
In other terms, the molar mass is the sum of the masses of all the atoms that make up a mole of a specific molecule, expressed in grams.
Here the molar mass of Fe(NO₃)₂ is :
Fe(NO₃)₂ = (1 x 55.85 g) + (2 x 14.01 g) +(6 x 16.00 g)= 179.87 g/mol
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In order to calculate the number of neutrons you must subtract the what from the what?
Answer:
You take the atomic, or proton number of the element, and you subtract it from the element's mass number.
Answer:
protons
Explanation:
neutrons and protons make up the mass of the atom
What mass in grams of PCl5 will be produced from 0.25 moles of PCl3 and excess chlorine gas?
Answer:
d
Explanation:
Calculate the amount of heat energy is needed to raise the temperature of 5.00 grams of lead from 25.0 to 35.0 degrees Celsius, if the specific heat capacity of lead is 0.129 J/g/C.
Answer: 6.45 Joules
Explanation: I just did it
help me please i don’t understand this