determine the enthalpy change when 7.08g of Ag is obtained. use the abbreviated form of the unit in your answer.
2AgBr(s) -> 2Ag(s) + Br2(l) deltaH = -220kJ
2AgBr(s) ⇒ 2Ag(s) + Br₂(l) ΔH = -220kJ ⇒ for 2 mol Ag
mol Ag = 7.08 : 108 g/mol = 0.065
the enthalpy change = 0.065/2 x -220 kJ = -7.15 kJ
The hydrogen emission spectrum is shown below. What is the energy of the
410 nm emission line? (The speed of light in a vacuum is 3.00 x 108 m/s, and
Planck's constant is 6.626 x 10-34 J.s.)
400
750 pm
Answer:
C.) 4.85 x 10⁻¹⁹ J
Explanation:
To find the energy, you need to use the following equation:
E = hc / w
In this formula,
-----> E = energy (J)
-----> h = Planck's Constant (6.626 x 10⁻³⁴ J*s)
-----> c = speed of light (3.00 x 10⁸ m/s)
-----> w = wavelength (m)
Once you have converted nanometers to meters, you can plug the given values into the equation and solve.
410 nm 1 m
------------- x ---------------------- = 4.10 x 10⁻⁷ m
1 x 10⁹ nm
E = hc / w
E = (6.626 x 10⁻³⁴ J*s)(3.00 x 10⁸ m/s) / (4.10 x 10⁻⁷ m)
E = 4.85 x 10⁻¹⁹ J
A syringe containing 35.0 mL of Xe gas at 298 K has a pressure of 0.980 atm. How many grams of Xe are in the syringe? Report your answer to the nearest 0.001 g
The mass of Xe present in the syringe given the data is 0.183 g
How to determine the mole of Xe Volume (V) = 35 mL = 35 / 1000 = 0.035 L Pressure (P) = 0.980 atm Temperature (T) = 298 KGas constant (R) = 0.0821 atm.L/Kmol Number of mole (n) =?Using the ideal gas equation, we can obtain the mole of Xe as follow:
n = PV / RT
n = (0.98 × 0.035) / (0.0821 × 298)
n = 0.0014 mole
How to determine the mass of XeMole = 0.0014 moleMolar mass of Xe = 131 g/moleMass of Xe = ?Mass = mole × molar mass
Mass of Xe = 0.0014 × 131
Mass of Xe = 0.183 g
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What was the weakness of the rutherford model of the atom that bohr addressed?
The weakness of the rutherford model of the atom that bohr addressed is that
The energy of the atom is quantized andThe atom does not lose energy as the electon rotates about the nucleusWhat is Rutherford model of the atom?The Rutherford model of the atom proposed by Ernest Rutherford in 1911 shows that the atom is much hollow space with its mass concentrated at the center being surrounded by electrons. It is the planetary model.
What is the Bohr model of the atom?The Bohr model of the atom proposed by Neils Bohr in 1913 suggests that
the energy of an atom is quantized and that it does not lose energy as the electron rotates about the nucleus.What was the weakness of the rutherford model of the atom that bohr addressed?The weakness of the rutherford model of the atom that bohr addressed is that
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calculate the amount of glucose required to prepare 250g of 5% sugar solution
Answer:
12.5g
Explanation:
1. Percentage of solution = 5.
2. Mass of solution = 250g.
3. = Mass of solute / 250 x 100.
4. = 5 x 250 / 100.
5. = 12.5g.
1. How does the Key change for a weak acid?
2. How would the images change for a weak acid solution of the same concentration? Draw the images and/or
describe with words.
3. Draw the images and/or describe with words a weak acid and a strong acid solution of the greater
concentration? Make any notes that might help you remember.
4. Write the chemical reactions for a weak acid and a strong acid.
5. Is there one type of representation that might be the best one for you to remember information about weak
and strong acids?
6. Make any notes that might help you remember how to compare/contrast the two types.
The weak acid will have fewer ions than the strong acid of similar concentration.
The chemical reactions for a weak acid and a strong acid is given below:
Strong acid: HA → H⁺ + A⁻Weak acid: HA ⇆ H⁺ + A⁻What are strong and weak acids?Strong acids are acids which dissociate completely in solutions. Examples of strong acids are hydrochloric acid and sulfuric acid.
Weak acids are acids which dissociate only partially in solutions. Examples of weak acids are carbonic acid and acetic acid.
Weak acids of a similar concentration to a strong acid have fewer hydrogen ions.
The equation of the dissociation of strong acids and weak acids are given below:
Strong acid: HA → H⁺ + A⁻Weak acid: HA ⇆ H⁺ + A⁻In conclusion, weak acids produce few ions in solution while strong acids fully dissociate into ions in solution.
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The greatest progress in reducing atmospheric levels of lead pollution resulted from Group of answer choices the switch from lead to graphite in pencils. new types of lead scrubbers on smokestacks that removed lead from the air. the development of new types of batteries that use lithium instead of lead. the elimination of leaded gas.
The greatest progress in reducing atmospheric levels of lead pollution resulted from the elimination of leaded gas.
What is atmospheric lead pollution?Atmospheric lead pollution refers to the presence of lead particles in the atmosphere.
Lead is a pollutant which affects the respiratory system.
Fuels that contains lead when burned releases lead into the atmosphere.
Therefore, the greatest progress in reducing atmospheric levels of lead pollution resulted from the elimination of leaded gas.
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The first step in the formation of all three products is the loss of the ots leaving group to give a carbocation intermediate. this intermediate is resonance-stabilized, and products b and c are generated from a different resonance structure than the one used to generate product a. draw the other resonance structure (using the carbon skeleton provided) and add curved arrow(s) to convert the first resonance structure into the second one.
The carbocation stabilized by resonance structure and thereby lowers the energy of the carbocation, hydrogen will add to the carbon in the double bond that produces delocalization of electrons.
What is carbocation?A carbocation is a molecule in which a carbon atom has a positive charge and three bonds.
In general, electrons are stabilized by delocalization. The stabilization energy engendered by delocalization over more than two atoms is called the resonance stabilization energy or simply the resonance energy. The greater the extent of electron delocalization the greater the resonance stabilization.
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Describe the characteristics that identify a sample of matter as being a substance.
Answer:
Any characteristic that can be measured, such as an object's density, color, mass, volume, length, malleability, melting point, hardness, odor, temperature, and more, are considered properties of matter.
What is periodicity?
the quality of being periodic the tangency to record the intervals
the prediotic of the sun sports cycle
There are 164 g H3PO3 formed during a
reaction. How many moles of H₂O are
required? (H3PO3: 82 g/mol)
Answer:
13448
Explanation:
i think im wrong but
164(82)=13448
it's 82g/mol) for this question
Consider the reaction below.
C₂H4(g) + H₂(g) → C₂H6(g)
Answer:
I don't see a question.
Explanation:
I do see a reaction in which tells us that the C2H4 has a double-bonded C. The additrtion of H2 breaks this bond and provides the two bonding sites needed for the 2 new hydrogen atoms.
H2C=CH2 + H2 → H3C-CH3
Q2. Name, constituent of petroleum (Petrochemicals) which is used for following purposes.
(i) To make candles.
(ii) A solvent for dry cleaning
(iii) For surfacing roads.
(iii) Jet engine fuel.
(v) For lubrication.
The constituents of petroleum that are used for the following purposes are as follows:
To make candles ----- Paraffin waxA solvent for dry cleaning ----- PetrolFor surfacing roads ----- BitumenJet engine fuel ----- KeroseneFor lubrication ----- Lubricating oil.What are the constituents of petroleum?The constituents of petroleum are LPG, bitumen, paraffin wax, lubricating oil, kerosene, diesel, etc. These compounds are a mixture of hydrocarbons.
Therefore, each constituent of petroleum that is used for the following purposes is mentioned above with proper names.
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I need the answer asap
Answer:
Explanation:
i ned help
What is the change in freezing
point, ATf, when the 0.195 m
aqueous solution of K2S dissolves
into 3 particles?
-1.09'C is the change in freezing point
“Freezing point depression” depends on the solvent and the molar concentration of the solute.
Sulfide is highly basic, consequently
K2S
completely and irreversibly hydrolyzes in water according to the following equation:
K2S+H2O→KOH+KSH
What is freezing?Freezing, also known as solidification, is a phase transition where a liquid turns into a solid when its temperature is lowered below its freezing point.
the temperature at which a liquid solidifies specifically : the temperature at which the liquid and solid states of the substance are in equilibrium at atmospheric pressure : melting point the freezing point of water is 0° Celsius or 32° Fahrenheit.
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Answer:1.0881
Explanation:
calculate the number of moles in positive and negative ions in 1.75 moles of calcium fluoride quizlet
CaF₂ ⇒ Ca²⁺ + 2F⁻
1.75 1.75 3.5
balanced equation for bromine and potassium iodide?
Answer:
Br2+KI→KBr+I2
Explanation:
Add distilled water to the beaker until the volume
totals 15 mL.
Record the amount of sodium chloride that
dissolved.
Ionic compounds such as sodium chloride, which dissolve in water and dissociate to form ions, are called electrolytes.
What are electrolytes?Electrolytes are substances that have a natural positive or negative electrical charge when dissolved in water.
Water molecules pull the sodium and chloride ions apart, breaking the ionic bond that held them together. After the salt compounds are pulled apart, the sodium and chloride atoms are surrounded by water molecules, as this diagram shows. Once this happens, the salt is dissolved, resulting in a homogeneous solution.
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Based on the electron configuration of the two
atoms, predict the ratio of metal cationic (+) atom
to nonmetal anionic (-) atom in the compound.
Magnesium 1s²2s²2p63s²
Sulfur 1s²2s²2p63s²3p4
A compound formed between Magnesium and Sulfur is MgS.
What is a cation?Cations are positively-charged ions (atoms or groups of atoms that have more protons than electrons due to having lost one or more electrons).
Magnesium, Mg, is located in period 3, group 2 of the periodic table, and has two electrons on its outermost shell.
On the other hand, sulfur, S, is located in period 3, group 16 of the periodic table, and has six electrons on its outermost shell.
Chemical reactivity is governed by an atom's "desire" to have a stable electron configuration and to have eight electrons in its outermost shell to complete an octet.
In this case, magnesium can complete its octet by giving up those two valence electrons, becoming the magnesium cation.
[tex]Mg^{2+}[/tex], in the process.
Sulfur, which only needs two electrons to complete its octet, will pick up the two electrons coming from magnesium, becoming the sulfide anion,
[tex]S^{2−}[/tex], in the process.
The electrostatic force of attraction will then bring the magnesium cations and the sulfur anions together to form an ionic bond.
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When molten magma cools ________ under the surface, it forms _________ igneous rocks.
A. rapidly, extrusive
B. slowly, extrusive
C. rapidly, intrusive
D. slowly, intrusive
what is the wavelength of a microwave with a frequency of 2450 mhz
Answer:
See below
Explanation:
The way to calculate this
speed of light = wavelength * frequency
3 x 10 ^8 m/s = wavelength * 2450000000 Hz
wavelength = .12245 meters
= 1.2245 x 10^-1 Meters
The wavelength of a microwave with a frequency of 2450 mhz is 1.2245 x 10⁻¹ meters.
What is wavelength?The wavelength is the time period or spatial period between the periodic wave and the distance between two waves. A microwave is a form of electromagnetic radiation.
The frequency of a microwave, f = 2450 MHz
We need to find the wavelength and the period of the microwaves
c = f λ
c = speed of light = 3 x 10 m/sec. 8 c = λf where λ = wavelength, f = frequency. Length
The relation between the wavelength and frequency is given by
The speed of light = wavelength x frequency
3 x 10⁸ m/s = wavelength x 24500 Hz
Wavelength = .12245 meters
1.2245 x 10⁻¹ Meters
Therefore, the wavelength of a microwave with a frequency of 2450 MHz is 1.2245 x 10⁻¹ meters.
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2 attempts left check my work
be sure to answer all parts.
calculate the density of a solid substance if a cube measuring 2.72 cm on one side has a mass of 129 g.
Answer:
6.41 gm / cm^3
Explanation:
cube volume = 2.72 x 2.72 x 2.72 cm^3 = 20.124
Density = mass / volume = 129 g / 20.124 cm^3 = 6.41 gm / cm^3
A student spilled a bottle of ammonia in one corner of the laboratory. Soon the whole laboratory was felled with pungent irritating small. The students immediately opened the windows and doors and switched on the exhaust fans. After sometime, students got relief. Explain what did actually happen?
Answer: Initially when the student spilled the bottle of ammonia the ammonia gas particles diffused with the particles of air in the room. We know that the rate of diffusion of gases is very high. So the entire room filled up with the pungent smell of ammonia.
When he opened the doors and windows and switched on the exhaust fan, the air from the room along with the ammonia gas diffused with the air outside the room.Moreover, outside air entered into the room so the concentration of ammonia gas in the room air reduced.Due to these reasons the student got relief.
How can i calculate the concentration of 2.357g of sodium chloride in 75ml solution
Answer:
See below
Explanation:
Simply : 2.357 g / 75 ml = .03142 gm/ml or 31.42 gm / liter
What is the correct formula that would result from the combination of the two ionic species?
Cs¹+ and Cl¹-
Answer: CsCl
Explanation:
When naming ionic compounds, the metal comes before the nonmetal.
How many moles of hydrogen atoms are contained in one mole of[tex]C_{6}H_{12}[/tex]?
The number of moles of hydrogen atoms contained in 1 mole of c6h12 is 12.
What is hydrogen made of?Hydrogen can be produced from various domestic resources such as fossil fuels, biomass, and the electrolysis of water by electricity. The environmental sustainability and energy efficiency of hydrogen depends on how hydrogen is produced.
Hydrogen is the simplest element. Each hydrogen atom has only one proton. Hydrogen is also the most abundant element in the universe. Stars like the Sun are mainly made of hydrogen. The sun is essentially a giant sphere of hydrogen and helium gas.
Some facts about hydrogen:
Hydrogen is the most abundant element on earth. Hydrogen is an alternative fuel with a very high energy content by weight.The fuel cell can be used to power multiple applications.Fuel cells are a clean way to generate electricity.Fuel cell vehicles are very similar to traditional gasoline vehicles
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Suppose you use bottles and balloons to run an experiment to measure the amount of metabolism by yeast. One of your bottles has black coffee and yeast, with a balloon sealing the top of the bottle. After 3 hours, you note that the balloon has not inflated at all. What is the most likely reason that it did not inflate
The yeast was not able to metabolize the sugar in black coffee and so, no carbon dioxide was produced.
What is the product of the action of glucose on yeast?Yeast metabolizes sugar or glucose to produce alcohol and carbon dioxide.
The carbon dioxide produced is responsible for the raising action of yeast on dough and for the inflation of the balloon.
In the experiment, the possible reason why the balloon did not inflate is that the yeast was not able to metabolize the sugar in black coffee and so, no carbon dioxide was produced.
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It is the year 2040, and you are a research scientist. The amount of sunlight that reaches the earth has been drastically reduced due to a major event like pollution, fires, or volcanoes. Farmers are asking you for help to save their failing crops.
Hydrogen reacts with an element to form a compound. which element would have the most valence electrons available to react with hydrogen?
Answer:
the element is oxygen
Explanation:
it will react to give H2O
How many grams of aluminum will
react fully with 1.25 moles Cl₂?
2Al + 3Cl₂ → 2AlCl₃
mol Al = 2/3 x 1.25 = 0.83
mass Al = 0.83 x 27 g/mol = 22.41 g
According to the stoichiometry 21.66 grams of aluminum will react fully with 1.25 moles Cl₂.
What is stoichiometry?Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.It is useful in balancing chemical reactions.
According to the chemical reaction between aluminium and chlorine, 2 moles of aluminium reacts with 3 moles of chlorine , thus,1.25 moles of chlorine will react 1.25×2/3=0.83 moles which is mass of aluminium =0.83×26=21.66 g.
Thus, 21.66 grams of aluminum will react fully with 1.25 moles Cl₂.
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