Answer:
Inorganic chemical reactions involve compounds without carbon atoms. Some of these chemical reactions emit light as the chemical compounds react. When light is emitted as a result of the chemical reaction, the reaction is said to be luminescent.
Explanation:
Answer:
Chemiluminescence is the production of light from a chemical reaction. Two chemicals react to form an excited (high-energy) intermediate, which breaks down releasing some of its energy as photons of light
Practice with Dilution Calculations IV,
12V
1. What is the initial volume of a 15.0 M stock solution which has been diluted to a final volume of
250.-ml at a concentration of 2.35 M?
Answer:
THE INITIAL VOLUME OF THE STOCK SOLUTION IS 0.0392 L OR 39.2 mL
Explanation:
To calculate the volume of a solution before dilution, we make use of the dilution formula;
C1 V1 = C2 V2
C1 = the concentration of the stock solution = 15 M
V 1 = the volume of stock solution = ?
C2 = concentartion of final solution = 2.35 M
V2 = volume of final solution = 250 mL = 250/ 1000 = 0.25 L
Rearranging the formula, we obtain;
V1 = C2V2 / C1
V 1 = 2.35 * 0.25 / 15
V1 = 0.5875 / 15
V1 = 0.0392 L
the initial volume of the stock solution is 0.0392 L or 39.2 mL
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Which particles are gained and lost during a redox reaction?
A) electrons
B) protons
C) neutrons
D) positrons
Answer:
Atoms of Zn (s) lose electrons and are oxidized. Atoms of Zn (s) lose electrons and are reduced. There is a net loss of mass. There is a net gain of mass.
Explanation:
The thermochemical equation shows the combustion of carbon in oxygen. How many moles of carbon, C must be burnt to produce 196.5 kJ of heat?
Given thermochemical equation; C(s) + O2(g) -> CO2(g) = -393 kJ mol ‐¹
Answer:
0.5 moles OF CARBON WILL BE BURNT SHOULD 196.5 kJ OF HEAT IS LIBERATED IN THE REACTION.
Explanation:
The standard heat of combustion of a substance is the heat evolved when one mole of the substance is burned completely in oxygen under standard conditions.
From the reaction, -393kJ of heat is required to burn 1 mole of Carbon completely in oxygen.
C(s) + O2 (g) -----> CO2(g) -393 kJ mol^-1
Should 196.5 kJ of heat was evolved by the reaction, the number of moles of carbon to be produced will be x moles;
-393 kJmol^-1 of heat was required to burn 1 mole of Carbon
196.5 kJ/mol of heat will burn x moles of carbon.
x = ( 196.5 * 1 / -393)
x = -0.5 moles
0.5 moles of carbon will be burnt when 196.5 kJ of heat is liberated
what do many bases have in common
Answer:
they often form hydroxide ions
Explanation:
What are five things gravity can do
a b c d e f g h i j k l m n o p q r s t u v w x y z
Answer:
B
Explanation:
The answer is substitution
Determine whether or not the equation below is balanced. If it isn’t balanced, write the balanced form. Also, identify the reactant(s) and product(s) in this equation. Finally, label this as one of the five types of reactions: combination, decomposition, substitution, double replacement, or reversible.
Answer:
This is a balanced equation because the same types of atoms and the same numbers of each atom are present on both sides of the equation. 8 S atoms are found on both sides of the equation, and 48 F atoms are found on both sides of the equation. S8 and 24F2 are the reactants; 8SF6 is the product. This is a combination reaction because two substances (S8 and 24F2) undergo a chemical union to form a more complex substance (8SF6).
S8+24F2→8SF6
Explanation:
Why would Pluto be colder than all of the other planets?
Answer:
Pluto is farthest from the sun and hence it receives extremely low energy of sun. The surface temperature of Pluto is about -240 !!!
no one's even answering, so i'll just uh leave this here
Answer:
answering what???
Explanation:
Answer:
I answered
Explanation:
The pH of a solution is 7.880. What is the concentration of [H30+] in the solution ?
Answer:
the concentration is 10^(-8) M
The concentration of [H30+] in the solution when the pH of the solution is [tex]1.32*10^8\ m.[/tex]
Calculation of the concentration:Since The pH of a solution is 7.880
So here
pH = -log{H+}
{H+} = [tex]10^-PH[/tex]
[H30+] [tex]= 10^{-7.88}[/tex]
[tex]= 1.3182*10^-8\ mol\\\\= 1.32*10^-8\ m[/tex]
hence, The concentration of [H30+] in the solution is [tex]1.32*10^8\ m.[/tex]
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What are electromagnetic waves, and how can they be seen?
radio waves, microwaves, infrared, light, ultraviolet, X-rays, and gamma rays. Your mind interprets the energies of light as different colors, from red to violet.
Answer for number 9 i need it asap thank you
Answer:
a) Trichloromethyl
b) Trinitrogen Pentoxide
c) Carbogen
Explanation:
How do you think climate change affected the strength of the hurricane?
How much solute will remain undissolved when 180 g of potassium iodide is added in 100 cm3 of water at 30°C?
Answer:
[tex]m_{undissolved}=27g[/tex]
Explanation:
Hello,
In this case, we first define the solubility as the maximum amount of a solute that is completely dissolved in an specific amount of solvent and it is temperature-dependent. Thus for potassium iodide, its solubility at 30°C is 153 g per 100 cm3 of water, therefore, with the given amount, the undissolved amount results:
[tex]m_{undissolved}=180g-153g=27g[/tex]
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Help ASAP it’s pass due
Answer:
I think its city y, I don't know if its right though.
Explanation:
Volume is the
variable, and the
temperature of the gas is the
variable.
DONE
Answer:
Volume is the dependent variable, and the
temperature of the gas is the independent variable.
Explanation:
Variables Independent Variable: temperature; Dependent Variable: volume
Constants: pressure and number of molecules
"Volume is the variable, and the temperature of the gas is the variable," it means that volume and temperature are both variables in a certain context or scenario.
A variable is a factor or quantity that can change or vary in value. In this case, volume and temperature are the variables being discussed.
Volume refers to the amount of space occupied by a gas. It can be altered by changing the physical conditions of the system, such as adding or removing gas molecules or changing the container size.
Temperature, on the other hand, refers to the measure of the average kinetic energy of the gas molecules. It determines the speed and energy of the gas particles. Temperature can be modified by adding or removing heat from the system.
Both volume and temperature play crucial roles in understanding the behavior of gases, particularly in gas laws such as Boyle's Law, Charles's Law, and the Ideal Gas Law.
Therefore, volume and temperature are being identified as variables that can be independently manipulated or observed to study the behavior of gases or analyze specific gas-related phenomena.
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Your question is incomplete, but most probably your full question was.
"Volume is variable, and the temperature of the gas is variable". Explain this statement.
When you standardized the Na2S2O3, what molarity of Na2S2O3 did you obtain?
V(Na2S2O3): 6.5 ml
V(KIO3)L: 5.0 ml
stoichiometric factor ( number of moles of Na2S2O3 reacting with one mole of KIO3): 6
Answer:
0.46M NaS₂O₃ (Assuming KIO₃ solution with a concentration of 1.0M)
Explanation:
Based on the reaction:
6 Na₂S₂O₃ + KIO₃ + 5 KI + 3 H₂SO₄ → 3 Na₂S₄O₆ + 3 H₂O + 3 K₂SO₄ + 6 NaI
6 moles of Na₂S₂O₃ react per mole of KIO₃
Assuming the molarity of the KIO₃ solution is 0,1M:
Moles of KIO₃: = 5.0x10⁻³L ₓ (0.1 mol / L) = 5.0x10⁻⁴ moles
As 6 moles of thiosulfate reacted per mole of iodate:
5.0x10⁻⁴ moles KIO₃ ₓ (6 moles Na₂S₂O₃ / 1 mole KIO₃) =
3.0x10⁻³ moles of Na₂S₂O₃. In 6.5mL (6.5x10⁻³L):
3.0x10⁻³moles Na₂S₂O₃ / 6.5x10⁻³ L = 0.46M NaS₂O₃
What volume of product is produced when 20.0 Mg of liquid hydrogen reacts with
excess liquid oxygen in a rocket propellant reaction? The gas is formed at 101.325 kPa and 40˚ C
Answer: The volume of product formed is 0.26 L
Explanation:
[tex]\text{Moles of solute}=\frac{\text{given mass}}\times{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} H_2=\frac{0.02g}{2g/mol}=0.01moles[/tex]
[tex]2H_2(l)+O_2(l)\rightarrow 2H_2O(g)[/tex]
As [tex]O_2[/tex] is the the excess reagent, [tex]H_2[/tex] is the limiting reagent as it limits the formation of product.
According to stoichiometry :
2 moles of [tex]H_2[/tex] give = 2 moles of [tex]H_2O[/tex]
Thus 0.01 moles of [tex]H_2[/tex] will give =[tex]\frac{2}{2}\times 0.01=0.01moles[/tex] of [tex]H_2O[/tex]
According to ideal gas equation:
[tex]PV=nRT[/tex]
P = pressure of gas = 101.325 kPa = 1 atm
V = Volume of gas = ?
n = number of moles = 0.01
R = gas constant =[tex]0.0821Latm/Kmol[/tex]
T =temperature =[tex]40^0C=(40+273)K=313K[/tex]
[tex]V=\frac{nRT}{P}[/tex]
[tex]V=\frac{0.01mol\times 0.0821L atm/K mol\times 313K}{1atm}=0.26L[/tex]
Thus the volume of product formed is 0.26 L
Draw the principal organic product expected when 2-methylthiophene reacts with hno3. show minimized formal charges, if applicable.
Answer:
2-Methyl-5-nitrothiophene
Explanation:
The 2- and 5-positions of thiophene are the most susceptible to electrophilic aromatic substitution.
Thus, the major product from the reaction of 2-methylthiophene with HNO₃ in acetic acid is 2-methyl-5-nitrothiophene.
What is one common reaction to all hydrocarbons?
Answer:
Common properties of hydrocarbons are the facts that they produce steam, carbon dioxide and heat during combustion and that oxygen is required for combustion to take place. The simplest hydrocarbon, methane, burns as follows: CH4 + 2 O2 → 2 H2O + CO2 + energy.
Explanation:
13. Hydrogen and helium have both been used to fill balloons. Which property of helium
makes it the preferred choice to hydrogen?
Answer:
Helium is lighter than Hydrogen and Helium is a much safer gas.
Answer:
Helium gas is known to be very light which makes it a preferred choice to hydrogen. Helium has low boiling point, low density, low solubility, high thermal conductivity and inertness. Since it is less dense, it is considered suitable for filling balloons.
A proton has _______ charge.
Answer:
positive
Explanation:
Explanation:
A proton has positive charge ...
Describe, in detail, the arrangement of the periodic table, and why it is sometimes referred to as the "chemists' calendar". Describe the rows and columns. What do they tell us about the elements in each row or column? What other trends are on the periodic table?
Answer:
The periodic table is an arrangement of chemical elements based on increasing atomic numbers.
Explanation:
The periodic table is an arrangement of chemical elements in order of increasing atomic numbers. According to the modern periodic law, the properties of elements is a periodic function of their atomic numbers.
The periodic table is arranged in columns and rows. The columns are called groups of elements. All elements in the same group have the same number of electrons on their outermost shell hence they possess the same chemical behavior. Elements across a period have the same number of shells thus they have the same maximum excitation level.
There are important trends across the periodic table such as atomic radius, ionic radius, electro negativity, electron affinity, melting and boiling points, metallic properties etc. All these depend on an elements position in the periodic table. periodic properties of elements increase or decrease across the period or increase or decrease down the group as the case maybe.
Hence, just as one can easily read off the date and make predictions based on dates shown in a calendar, a chemist can read off the properties of elements and make predictions about the reactivity and physical properties of elements based on their relative position in the periodic table.
Gradual changes that occur down the group in the periodic table are called group trends and they usually very significant in discussing the properties of members of a group.
Answer:
The periodic table is an arrangement of chemical elements based on increasing atomic numbers.
Explanation:
The periodic table is an arrangement of chemical elements in order of increasing atomic numbers. According to the modern periodic law, the properties of elements is a periodic function of their atomic numbers.
The periodic table is arranged in columns and rows. The columns are called groups of elements. All elements in the same group have the same number of electrons on their outermost shell hence they possess the same chemical behavior. Elements across a period have the same number of shells thus they have the same maximum excitation level.
There are important trends across the periodic table such as atomic radius, ionic radius, electro negativity, electron affinity, melting and boiling points, metallic properties etc. All these depend on an elements position in the periodic table. periodic properties of elements increase or decrease across the period or increase or decrease down the group as the case maybe.
Hence, just as one can easily read off the date and make predictions based on dates shown in a calendar, a chemist can read off the properties of elements and make predictions about the reactivity and physical properties of elements based on their relative position in the periodic table.
Gradual changes that occur down the group in the periodic table are called group trends and they usually very significant in discussing the properties of members of a group.
Explanation:
Which technology is unted to service versand
Answer: a computer
Explanation:
How many atoms are in a casein molecule?
13) State four factors that can disrupt the
balance of the ecosystem-
Answer:
habitat change, climate change, invasive species, and pollution
Explanation:
Answer:
I’m looking for an answer aswell
Explanation:
In calculating the mass of an atom the mass of the electrons is essentially
Answer:
Sex
Explanation:
For 1 dish of potato wedges, you will need 5 potatoes , 2tbs pepper, and energy. You need to make 80 batches of potato wedges. How many potatoes do you need? Do you have enough?
Answer: you will need 400 potatoes
Explanation:
A scientist provides 454 kJ of energy to a covalent compound in order to start a reaction. As a result, heat is released. Which statement is true about this experiment?
The amount of energy produced is more than 454 kJ.
The amount of energy produced is equal to 454 kJ.
The amount of energy produced is less than 454 kJ.
The amount of energy produced is at least double that of 454 kJ.
Answer:
The amount of energy produced is less than 454 kJ.
Explanation:
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How many moles of MgCl2, are in 400. L of a 0.021 M solution?
A 0.75 mol
B 8.4 mol
C 7.5 mol
D 0.84 mol
Answer:
The correct answer to the following question will be Option B "8.4 mol".
Explanation:
The given values are:
Molarity of a solution = 0.021 M
Litres of solution = 400 L
Let the moles be "x".
As we know,
⇒ [tex]Molarity = \frac{Moles \ of \ solute}{Litres \ of \ solution}[/tex]
On putting the estimated values, we get
⇒ [tex]0.021=\frac{x}{400}[/tex]
On applying cross-multiplication, we get
⇒ [tex]x =0.021\times 400[/tex]
⇒ [tex]x=8.4 \ mol[/tex]