Answer:
as the charge of the ions increases, the lattice energy increases. as the size of the ions increases, the lattice energy decreases.
For a given arrangement of ions, the lattice energy increases as ionic radius decreases and as ionic charge increases.
What is ion?An atom or molecule is said to be an ion if one or more of whose valence electrons have been acquired or lost, providing it a net negative or positive electrical charge.
Faraday knew that metals disintegrated together into solution place at a single electrode and that a second metal was placed first from solution at the opposite electrode, as such matter had to be trying to move underneath the impact of an electrical current even though he was unable to identify the particles trying to move between the electrodes. For a given arrangement of ions, the lattice energy increases as ionic radius decreases and as ionic charge increases.
Therefore, for a given arrangement of ions, the lattice energy increases as ionic radius decreases and as ionic charge increases.
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Each pure substance has characteristic physical and chemical properties that can be used to identify it.
Compare and contrast physical properties and chemical properties of a substance. Give and example for each:
2 C2H2 + 5 O2
2 H2O + 4 CO2
what reaction type
Answer:
Combustion reaction
General Formulas and Concepts:
Chemistry
Synthesis Reactions: A + B → ABDecomposition Reactions: AB → A + BSingle-Replacement Reactions: A + BC → AB + CDouble-Replacement Reactions: AB + CD → AD + BCExplanation:
Step 1: Define
2C₂H₂ + 5O₂ → 2H₂O + 4CO₂
Step 2: Identify
Any organic molecule reacting with oxygen to produce water and carbon dioxide is a combustion reaction.
We also see from the RxN that is is a double replacement reaction.
Answer:
Answer: 0.4 g
Explanation:
1) Balanced chemical equation:
2) 2C2H2 + 5 O2 → 4CO2 + 2 H2O
3) mole ratios:
2 mol C2h2 : 5 mol O2
4) Convert 0.13 g C2H2 into number of moles
n = mass in grams / molar mass
molar mass C2H2 = 2 *12g/mol + 2*1 g/mol = 26 g/mol
n = 0.13 g / 26 g/mol = 0.005 mol
5) Set the proportion with the unknown
5 mol O2 x
----------------- = ---------------
2 mol C2H2 0.005 mol C2H2
x = 0.005 mol C2H2 * 5 mol O2 / 2 mol C2H2 = 0.0125 mol O2
6) Convert 0.0125 mol O2 to grams
mass = number of moles * molar mass
molar mass of O2 = 32 g/mol
mass = 0.0125 mol * 32 g/mol = 0.4 g
Answer: 0.4 g
Explanation:
If the % acetic acid listed on a vinegar bottle is 4%, what is the implied uncertainty of the acetic acid concentration
Answer:
This question appears incomplete
Explanation:
This question appears incomplete because the data provided only makes it possible to calculate the certainty of the acetic acid content per total volume of the vinegar. Thus, the 4% means for every 100 mL of the vinegar, there is 4 mL of acetic acid present. To calculate the volume of acetic acid in any other volume of vinegar, the formula will be
volume of acetic acid = 4/100 × total volume of vinegar
Which element has a smaller atomic radius?
tungsten (74) or oxygen (8)
Answer:
Oxygen
Explanation:
Atomic radius trend
-decreases from left to right
-increases from top to bottom
Tungsten is in period 7, which has a larger atomic radius
Oxygen is in period 2, which is in a lower energy level and is on the right side. Therefore, has a smaller atomic radius.
What is the molarity of 9.0 moles of NaCl dissolved in 15.0 liters if solution?
The movement of water is able to transport minerals and nutrients. Which statement best explains why water is able to do this?
A. Water has a density of one gram per milliliter
B. Water is an excellent solvent
C. Water absorbs heat energy
D. Water is a liquid at room temperature
2. Calculate the new molanty of a solution formed when 20 ml of water is added to 100 ml of
0.2M NaOH
Answer:
New molarity = M₂ = 0.167 M
Explanation:
Given data:
New molarity = M₂ = ?
Final volume = V₂ = 100mL + 20 mL = 120 mL
Initial volume =M₁ = 100 mL
Initial molarity =V₁ = 0.2 M
Solution:
M₁V₁ = M₂V₂
0.2 M × 100 mL = M₂ × 100 mL
M₂ = 0.2 M × 100 mL/120 mL
M₂ = 20 M.mL/120 mL
M₂ = 0.167 M
HELP ME PLEASE I will mark brainliest
Answer:
Nice pic there
Explanation:
No need
What property of gases confirms that the space between the particles of gas is significantly larger than when the same substance is in a liquid state?
A. Mobility
B. Reactivity
C. Volatility
D. Compressibility
Answer:
D. Compressibility
Explanation:
What is the wavelength, in nanometers, of light with a frequency of 1.90x10^15 Hz?
Answer:
1.58×10² nm
Explanation:
Given data:
Frequency of light = 1.90 ×10¹⁵ Hz
wavelength of light = ?
Solution:
Speed of light = wavelength × Frequency
Speed of light = 3×10⁸ m/s
3×10⁸ m/s = λ × 1.90 ×10¹⁵ Hz
Hz = s⁻¹
λ = 3×10⁸ m/s / 1.90 ×10¹⁵s⁻¹
λ = 1.58×10⁻⁷ m
meter to nm:
1.58×10⁻⁷ m ×10⁹ nm/ 1m
1.58×10² nm
The heat of vaporization of acetic acid is . Calculate the change in entropy when of acetic acid condenses at .
The question is incomplete, the complete question is;
The heat of vaporization ΔHv of acetic acid HCH3CO2 is 41.0 /kJmol. Calculate the change in entropy ΔS when 954.g of acetic acid condenses at 118.1°C. Be sure your answer contains a unit symbol. Round your answer to 3 significant digits.
Answer:
-1.67 JK-1
Explanation:
Since Heat of vaporization of acetic acid = 41.0 kJ/mol
Therefore:
Heat of condensation of acetic acid = -41.0 kJ/mol
Mass of acetic acid = 954 g
Temperature of condensation = 118.1 °C or 391.1 K
Number of moles of acetic acid = 954 g/60g/mol = 15.9 moles
Heat evolved during condensation = 15.9 moles * -41.0 kJ/mol = -651.9 KJ
Entropy change (ΔS) = Heat evolved/ Temperature = -651.9 KJ/391.1 K
Entropy change (ΔS) = -1.67 JK-1
Give two everyday examples of the thermal energy of a substance being decreased
Answer:
An example of the thermal energy of a substance being decreased is with our food. With the thermal energy of food being decreased it is easier for foods to be eaten comfortably without any damage to the tongue or alimentary canal.
Another good example is in the handling of hot objects in the home. Thermal energy decrease in objects such as iron, pots etc helps to prevent serious burns and injuries.
Answer:
Water turning into ice
juice frozen to make popsicles
Explanation:
When something goes from liquid to a solid, that is a process called freezing. When a object loses thermal energy the particles move slower forming a solid.
what type of change occurs when rust on a nail a. chemical change b. physical change
Answer:
Chemical change
Explanation:
The rusting of iron/a nail is a chemical change
Iron (Fe) and Oxygen (O) combine to create the compound Iron Oxide (Fe2O3), which is rust.
A 2.4L balloon filled with helium at room temperature 25oC is put into liquid nitrogen
(-196oC). What will the new volume be?
Answer:
V₂ = 0.62 L
Explanation:
Given data:
Initial volume = 2.4 L
Initial temperature = 25°C
Final temperature = -196°C
Final volume = ?
Solution:
Initial temperature = 25°C (25+273 = 298 K)
Final temperature = -196°C ( -196+273 = 77 K)
The given problem will be solve through the Charles Law.
According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.
Mathematical expression:
V₁/T₁ = V₂/T₂
V₁ = Initial volume
T₁ = Initial temperature
V₂ = Final volume
T₂ = Final temperature
Now we will put the values in formula.
V₁/T₁ = V₂/T₂
V₂ = V₁T₂/T₁
V₂ = 2.4 L × 77 K / 298 k
V₂ = 184.8 L.K / 298 K
V₂ = 0.62 L
An atom has 10 protons and 10 electrons. What happens to the charge if you add 1 more electron
Answer:
it becomes a negstive charge
To prepare 380 mL of 0.500 M NaCl (MW = 58.5 g/mol), how many grams of sodium chloride is required?
11.12 grams of sodium chloride is required to prepare 380 mL of 0.500 M NaCl (MW = 58.5 g/mol).
HOW TO CALCULATE MASS:
The mass of a substance can be calculated by multiplying the number of moles of the substance by its molar mass. However, the number of moles of sodium chloride must first be calculated by multiplying the molarity by its volume. Molarity = no. of moles ÷ volume 0.500M = n ÷ 0.380Ln = 0.5 × 0.380n = 0.19molmass of NaCl = 58.5g/mol × 0.19molMass of NaCl = 11.12gTherefore, 11.12 grams of sodium chloride is required to prepare 380 mL of 0.500 M NaCl (MW = 58.5 g/mol).Learn more about how to calculate mass at: https://brainly.com/question/14948089?referrer=searchResults
among the intermolecular forces,which forces are typically the weakest
Answer:
The London dispersion force is the weakest intermolecular force. The London dispersion force is a temporary attractive force that results when the electrons in two adjacent atoms occupy positions that make the atoms form temporary dipoles.
Give the name for the molecular compound O3Cl2.
Answer:
dichlorine trioxide
Explanation:
di-2 tri-3 there are three oxygens and two chlorines.
Answer:
Dichlorine Trioxide
Explanation:
The molar mass and molecular weight of Cl2O3 is 118.904.
Sean plated an unknown metal onto his silver earring which initially weighed 1.41 g. He constructs an electrolytic cell using his ring as one of the electrodes. After running the cell, 0.022 moles of the unknown metal was plated onto his ring and the mass of the ring increased to 3.952 g. What is the atomic weight of the unknown metal in g/mol
Answer:
115 g/mol
Explanation:
Step 1: Given data
Initial mass of the earring (mi): 1.41 gFinal mass of the earring (mf): 3.952 gMoles of the unknown metal deposited (n): 0.022 molStep 2: Calculate the mass of the unknown metal deposited
An earring is plated in an electrolytic cell. The mass of the unknown metal deposited can be calculated using the following expression.
m = mf - mi
m = 3.953 g - 1.41 g
m = 2.54 g
Step 3: Calculate the molar mass (M) of the unknown metal
0.022 moles of the metal have a mass of 2.54 g. The molar mass of the metal is:
M = m/n
M = 2.54 g / 0.022 mol
M = 115 g/mol
How many alkyl substituents does N-ethyl-N-methylaniline have?
one
two
O three
o eight
none
Answer:
Two.
Explanation:
Hello!
In this case, considering the attached picture wherein you can see the presence of the parent chain as aniline, we can see radicals at the nitrogen, named by N-ethyl and N-methyl which are the present alkyl substituents. In such a way, the benzene ring is not considered an alkyl radical because it belongs to the parent chain on aniline and therefore, N-ethyl-N-methylaniline has two alkyl substituents.
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There are two alkyl substituents attached to the nitrogen; one ethyl and one methyl group
Aniline consists of a benzene ring to which an -NH2 moiety is attached. Usually, it is possible for the any of the two hydrogen atoms in the -NH2 moiety to become substituted leading to N-alkylated product.
In the compound N-ethyl-N-methylaniline, there are two alkyl substituents attached to the nitrogen; one ethyl and one methyl group as shown in the image attached to this answer.
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A chemist dissolves 249.mg of pure perchloric acid in enough water to make up 380.mL of solution. Calculate the pH of the solution. Be sure your answer has the correct number of significant digits.
Answer:
pH = 2.18
Explanation:
Perchloric acid (HClO₄) is a strong acid. This means that in an aqueous solution it completely dissociates into H⁺ and ClO₄⁻ species.
First we convert 249 mg HClO₄ into moles, using its molecular weight:
249 mg HClO₄ ÷ 100.46 mg/mmol = 2.49 mmol HClO₄Because it is a strong acid, 2.49 mmol HClO₄ = 2.49 mmol H⁺
We calculate the molar concentration of H⁺:
2.49 mmol H⁺ / 380 mL = 6.52x10⁻³ MFinally we calculate the pH of the solution:
pH = -log[H⁺] = -log(6.52x10⁻³)pH = 2.18Why is K lighter than Na
Answer:
Basically, in the case of sodium and potassium the increase in shell size outweighs the pull of the core on the outer shell electron and so potassium is less dense than sodium. When we more from Na to K, effect of increase in volume is more pronounced as compared to effect of increase in atomic mass.
Question 2 (2 points)
Saved
How many grams of water do will you need to prepare 480 g of 8.5% solution of
C6H12O6
Answer:
[tex]m_w=439.2g[/tex]
Explanation:
Hello!
In this case, since the by-mass percent of a solution is a measure of the mass of the solute over the mass of the solution:
[tex]\%m/m=\frac{m_{solute}}{m_{solution}} *100\%[/tex]
As we know the mass of the solution and the by-mass percent, we can compute the mass of glucose in the 480 g of solution:
[tex]m_{solute}=\frac{\%m/m*m_{solution}}{100\%}[/tex]
Thus, by plugging in the data, we obtain:
[tex]m_{solute}=\frac{8.5\%*480g}{100\%}=40.8g[/tex]
Finally, since the solution is made up of glucose and water, we compute the mass of water as follows:
[tex]m_w=m_{sol}-m_{solute}=480g-40.8g\\\\m_w=439.2g[/tex]
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A student with a body temperature of 37℃ holds a piece of ice that has a temperature of -8℃. Which statement best explains what happens?
A. Heat transfers coldness from the ice to the student's hand.
B. Thermal energy transfers heat from the student's hand to the ice.
C. Heat transfers thermal energy from the student's hand to the ice.
D. Thermal energy transfers coldness from the student's hand to the ice.
Answer: C. Heat transfers thermal energy from the student's hand to the ice.
Explanation: It seems confusing; b and c seem to be saying the same thing, but the definition of heat is the transfer of thermal energy from a warmer object to a colder object.
A party balloon filled with helium deflates to 2/3 of its original volume in 8.0 hours. How long will it take an identical balloon filled with the same number of moles of air (ℳ = 28.2 g/mol) to deflate to 1/2 of its original volume?
Answer:
The easy way to do this is to assume the number of moles. Make it a number easily divided by both 2 and 3, so say 6. Now you can have numbers to plug in to Graham's Law to find the second rate, then use the second rate to find the time. Does that make sense?
Calculate the standard cell potential, ∘cell, for the equation Co(s)+F2(g)⟶Co2+(aq)+2F−(aq) Use the table of standard reduction potentials. ∘cell=
Answer:
3.15 V
Explanation:
Step 1: Write the balanced cell reaction
Co(s) + F₂(g) ⟶ Co²⁺(aq) + 2 F⁻(aq)
Step 2: Identify both half-reactions:
Cathode (reduction): F₂(g) + 2 e⁻ ⟶ 2 F⁻(aq) E°red = 2.87 V
Anode (oxidation): Co(s) ⟶ Co²⁺(aq) + 2 e⁻ E°red = -0.28 V
Step 2: Calculate the standard cell potential
We will use the following expression.
E°cell = E°red,cathode - E°red,anode
E°cell = 2.87 V - (-0.28 V) = 3.15 V
Given E°cell > 0, the reaction is spontaneous.
Taking into account the definition of standard cell potential, E°cell has a value of 3.15 V.
The balanced cell reaction is:
Co(s) + F₂(g) ⟶ Co²⁺(aq) + 2 F⁻(aq)
First of all, it must be taken into account that oxidation is a reaction where an atom, ion or molecule loses electrons while reduction corresponds to the gain of electrons from an atom, ion or molecule.
Both oxidation and reduction depend on the change in the oxidation state of the atom, that is, on the difference in the charge of the atom in a reaction.
The oxidation and reduction reactions always occur simultaneously for what are generally known as oxidation-reduction reactions or redox reactions.
So, the anode corresponds to the negative electrode which normally oxidizes in the electrolytic chemical reaction while the cathode corresponds to the positive electrode which normally reduces its oxidation state when it receives electrons.
Si, in this case, the both half-reactions will be:
Cathode (reduction): F₂(g) + 2 e⁻ ⟶ 2 F⁻(aq) E°red = 2.87 V Anode (oxidation): Co(s) ⟶ Co²⁺(aq) + 2 e⁻ E°red = -0.28 V
The potential of an Ecel cell is a measure of the difference in electronic energy between the two electrodes. The electronic energy of each electrode is related to the force with which the reaction occurs at the electrode-solution interface. The unit in which it is measured is the volt.
In electrochemistry, because a cell reaction is made up of two half-cell reactions, each of which has a characteristic electrode potential, the potentials measure the driving force of the two half-reactions.
The cell potential is obtained by subtracting the potentials of both half cells as shown below:
E°cell= Ecatode - Eanode
So, in this case, the Ecell is calculated as:
E°cell = 2.87 V - (-0.28 V) = 3.15 V
In summary, E°cell has a value of 3.15 V.
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A gas-forming reaction produces 1.95 m3 of gas against a constant pressure of 196.0 kPa. Calculate the work done by the gas in joules.
Answer:
Work done W = -382,206 J (Approx)
Explanation:
We know that;
1 atm = 101.32 kPa
1 L-atm = 101.325 J
1 m³ = 1,000 L
Computation:
Work done W = -P∆V
Pressure = 196 kPa × (1 / 101.32 kPa)
Pressure = 1.9344 atm
∆V = 1.95 × (1000 L) = 1,950 L
So,
W = -(1.9344 atm) × (1,950 L)
W = -3772.0 L-atm
Work done W = -3772.0 L-atm × (101.325 J / 1 L.atm)
Work done W = -382,206 J (Approx)
The work done by the gas in Joules is equal to 3,763.5 Joules.
Given the following data:
Pressure = 196.0 kPa. Volume = 1.95 [tex]m^3[/tex]Conversion:
1 atm = 101.325
X atm = 196.0 kPa
X = [tex]\frac{196.0}{101.325} = 1.93\; atm[/tex]
Conversion:
1 [tex]m^3[/tex] = 1000 Liter
1.95 [tex]m^3[/tex] = 1950 Liter
To calculate the work done by the gas in Joules:
Mathematically, the work energy by a system is given by the formula:
[tex]Work = P \delta V[/tex]
Where:
P is the pressure. V is the volume.
Substituting the parameters into the formula, we have
[tex]Work\;energy = 1.93 \times 1950[/tex]
Work energy = 3,763.5 Joules.
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A pure substance made of two two or more elements that are chemically combined is a(n)
Answer:
A pure substance made up of two or more elements that are chemically combined is a compound
Explanation:
A substance that functions to prevent rapid, drastic changes in the pH of a body fluid by changing strong acids and bases into weak acids and bases is called a(n):
A. Buffer
B. Salt
C. Enzymes
D. Coenzyme