Answer:
The salt bridge serves to complete the electrical circuit in the galvanic cell. It is pertinent that the salt bridge ions are in high concentrations as this allows electron mobility and keeps each half cell electronically neutral. The diluted salt bridge wuld cause a buildup of positive charge in the anode and negative charge in the cathode and the electrode half reactions which either reduce or oxidise species would halt. Causing the cell to stop producing electronic energy, impedeing the proper functioning of the galvanic cell.
Diethylene glycol is an organic compound used as a fuel in heating cans. Based on its structure and your data recorded in Data Table 3, how do you hypothesize its energy efficiency (cal/g) compared to isopropanol and paraffin wax?
Due to its higher oxygen content and based on its structure dietheylene glycol has a higher energy efficiency (cal/g) compared to isopropanol and paraffin wax.
What is the calorific value of a fuel?The calorific value of a fuel is the amount of heat energy released from the combustion of the fuel under standard conditions.
Dietheylene glycol, isopropanol and paraffin wax are all used as fuels.
However, due to it higher oxygen content and based on its structure, diethethylene glycol has a higher calorific value than either isopropanol or paraffin wax.
Therefore, dietheylene glycol has a higher energy efficiency (cal/g) compared to isopropanol and paraffin wax.
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3) 2H₂ +_0₂ → 2H₂O
How many grams of water would be created if 17 grams of oxygen reacted?
(50-100 points!) write the unbalanced chemical equation for the following reaction: silicon dioxide + hydrofluoric acid produces silicon tetrafluoride + water
Answer:
Unbalanced: SiO2 + HF = SiF4 + H2O
Explanation:
Unbalanced: SiO2 + HF = SiF4 + H2O
Answer:
SiO2 + HF = SiF4 + H2O
IF 0.5 MOL NITROGEN GAS HAS A VOLUME OF II.0 L SOME TEMPERATURE AND
PRESSURE, WHAT WOULD THE VOLUME BE OF 0.8 MOL OF NITROGEN GAS AT THE SAME
TEMPERATURE AND PRESSURE VALUES?
Vi= 0.5 mol
Answer:
17.92L or 17.92dm³1
Explanation:
number of moles of a gas = volume of that gas/ 22.4(S.V.P)
0.8 mol = x / 22.4
cross multiplication
x = 22.4 × 0.8
x = 17.92
:. the volume of 0.8 mol of nitrogen gas is 17.92dm³ or 17.92L
C6H12 + 9 O2 –> 6 CO2 + 6 H2O
How many grams of O2 are consumed when C6H12 is burned to yield 5.3 grams of CO2?
5.76 g of [tex]O_2[/tex] are consumed when [tex]C_6H_1_2[/tex] is burned to yield 5.3 grams of [tex]CO_2[/tex].
What is a mole?A mole is defined as 6.02214076 × [tex]10^{23}[/tex] of some chemical unit, be it atoms, molecules, ions, or others.
Calculating moles of [tex]CO_2[/tex]
Number of mole of [tex]CO_2[/tex] = [tex]\frac{\;Given \;mass}{\;Molar \;mass}[/tex]
[tex]\frac{\;Given \;mass}{\;Molar \;mass}[/tex] = [tex]\frac{5.3g}{44 g/mol}[/tex] = 0.12 mol
As is clear from the reaction stoichiometry, 9 moles of [tex]O_2[/tex] are consumed to yield 6 moles of [tex]CO_2[/tex].
Calculating the number of moles of [tex]CO_2[/tex]
[tex]\frac{0.12 X 9}{6}[/tex] = 0.18 mol
Mass of [tex]O_2[/tex] consumed is = 0.18 X 32.0 =2.7 g =5.76 g
Hence, 5.76 g of [tex]O_2[/tex] are consumed when [tex]C_6H_1_2[/tex] is burned to yield 5.3 grams of [tex]CO_2[/tex].
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Explain, in terms of structure and bonding, why iron (a metal) has higher melting point than sodium chloride (an ionic compound).
Answer:
As metals are giant lattice structures, the number of electrostatic forces to be broken is extremely large
Explanation:
This means that the melting point and boiling point of metals are more similar to those for ionic compounds than for covalent substances.
A cup of coffee contains 500 mg of caffeine which has the chemical formula C8H10N4O2. Which one of the following is the number of nitrogen atoms present in this amount of caffeine?
A 1.55x10^21
B 6.21x10^21
C 1.55x10^23
D 6.21x10^24
the answer is B but i dont know the method!
Answer:
= 6.21x10^21
Explanation:
It's the train track method, where you try to cancel all the units and end with units that you need. Here we want to end with number of atoms of N.
500 mg N x 1 g N/1000 mg N x 1 mol N/194.19 g N x 4 mol N/1 mol of caffeine x (6.022 x 10^23 particles of N / 1 mol N)
= 6.21x10^21
What pressure (in atm) is required to contain 0.034 moles of oxygen gas in a 5.1 L container at a temperature of 25.00C
Answer:
0.16 atm
Explanation:
Let's look at the formula PV=nRT. First of all, T should be in kelvin, so let's add 273. Now solve for P so we get P = nRT/V.
Now let's plug these in...
P = (0.034 mol)(0.08206 L atm mol^-1 K^-1)(298 K)/5.1 L
After solving and rounding to sig figs we get 0.16 atm
How Many grams of H2O are equivalent to 0.4 mole of H2O ?
Answer:
0.72 grams
Explanation:
How many moles of sodium ions are in 5.70 grams of sodium sulfide?
Answer:
0.07
Explanation:
to find mole you divide mass by the relative atomic mass
Now you find the relative atomic of of moles pf he number sodium sulfide
then you thequation for finding moles to find mole of sodium
can someone please show work and help me with this thank you <3
Answer:
.846 grams of H2
Explanation:
The vapor pressure of benzene at 25°C is 95.15 torr. A solution of 6.00 g of a non-volatile solution dissolved in 250.00 g of benzene has a vapor pressure of 92.8 torr at 25°C. What is the molecular weight of the solute?
Answer:
The vapor pressure of the pure solvent will be equal to 55.7 mmHg.
You're dealing with a solution of sucrose, which is your solute, dissolved in ethanol, which is your solvent.
Since sucrose is a non-volatile solute, the vapor pressure of the solution can be expressed using the mole fraction of the solvent - this is known as Raoult's Law.
P
solution
=
χ
solvent
⋅
P
∘
solvent
, where
P
solution
- the vapor pressure of the solution;
χ
solvent
- the mole fraction of the solvent;
P
∘
solvent
- the vapor pressure of the pure solvent.
The mole fraction of the solvent is defined as the number of moles of ethanol divided by the total number of moles present in the solution.
Use sucrose and ethanol's respective molar masses to determine how many moles of each you have
10.0
g
⋅
1 mole sucrose
342.3
g
=
0.0292 moles sucrose
and
100.0
g
⋅
1 mole ethanol
46.07
g
=
2.171 moles ethanol
The total number of moles will be
n
total
=
0.0292
+
2.171
=
2.20 moles
The vapor pressure of the pure solvent will thus be
P
∘
solvent
=
P
solution
χ
solvent
P
∘
solvent
=
55.0 mmHg
2.171
moles
2.20
moles
=
55.7 mmHg
Explanation:
the tutorial associated with this question.
What is the total number of atoms contained in 2 moles of
iron?
A
O 118
O 1.204 x 1024
O 2
O 6022 y 1023
A 21.94-gram sample of magnesium nitrate was used to create a 2.11 M solution. What is the
volume of the solution in milliliters?
Answer:
70.1 mL
Explanation:
First let's look at the formula for magnesium nitrate, and get the molar mass, we should end up with Mg(NO3)2 for the formula and this should have a molar mass of 148.3 g/mol.
Lets get the number of moles of the magnesium by taking the number of grams over the molar mass, (21.94 g)/(148.3 g/mol). grams cancel and we're left with approximately 0.148 moles.
Now let's plug our numbers into the molarity formula, M = n/L, this should give us 2.11 mol/L = (0.148 mol)/L, now let's solve for L, divide both sides by 0.148 which will give us 14.26 L^-1 = 1/L now we take the inverse of both sides to get 0.07012 L = L.
Now we have the liters, but the question askes for milliliters, so let's multiply by 1000, and then after rounding to sig figs we will get 70.1 mL as our answer. (Note: I used the exact values instead of the approximations throughout this explanation, so if you calculate the answer by plugging in these values, it might be slightly off.)
What is the molarity of a solution that contains 20 grams of CaBr2
in 0.50 liter of solution?
Answer:
2 M
Explanation:
mole weight of CaBr2 = 40 + 2 * 79.9 = 199.8 gm
20 gm is then 20/199.8 =.1 mole
.1 mole / .50 liter = 2 M
What is the molarity of a solution formed by dissolving 55.43 grams of CaF- in 3.87 L of solution?
Answer:
0.24mol/L
Explanation:
The molarity of a solution is also its Concentration (C)
C = [tex]\frac{Moles(n)}{Volume (V)}[/tex]
mass of CaF = 55.43g
volume = 3.87L
Molar mass of CaF = 58.99g/mol
moles = [tex]\frac{55.43g}{58.99g/mol}[/tex]
=0.94mol
∴ Concentration = [tex]\frac{0.94mol}{3.87L}[/tex]
= 0.24mol/L
If an atom has 16 protons, 15 neutrons, and 17 electrons, what is the atom's electrical charge?
Answer:
-1
Explanation:
Neutrons have no charge
Protons = +
Electrons = -
16 - 17 = -1
why does a phone circuitry need elements that are good conductors?
Answer:Conductors and insulators are both important in the field of electronics. Electrical conductors allow electric current to flow easily because of the make up of their atoms. In a conductor, the outer electrons of the atom are loosely bound and can freely move through the material when an electric charge is applied.
Explanation:hope its help
What are the reactants in the reaction?
What are/is the product of the reaction?
Answer:
reactants are hydrogyn and oxygen, the product is water
Explanation:
Reactants are what start the reaction, they are joined together making a reaction that can result in a mix of both or a really new product. The product is, as named, the product of the reactants reaction, it is the outcome. In this case, hydrogen and oxygen join together, making a reaction that ended up with water(the product).
ur wlcm :)
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If you burned 52 grams of methane (CH4) and obtained 100 grams of water as a
product what is your percent yield?
The percent yield of methane is 85.5%.
What is percent yield of a reaction?The percent yield of a reaction is the ratio of the actual yield and the expected yield expressed as a percentage.
Percent yield = actual yield/expected yield × 100%Equation of reaction is given below:
1 mole of methane produces 2 moles of water
16 g of methane produces 36 grams of water
52 g of methane will produce 117 g of water
Percent yield = 100/117 × 100% = 85.5%
Therefore, the percent yield of methane is 85.5%.
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A 250 mL sample of oxygen is collected over water at 25 degrees Celsius and 769 torr pressure. What is the pressure of the dry gas alone? (Vapor pressure of water at 25 degrees Celsius = 23.8 torr)
Dalton's Law
P tot = P H₂O + P gas
769 = 23.8 + P gas
P gas = 745.2 torr
What are some steps an individual can take to help combat food and water scarcity?
The following steps can be taken
Spreading awareness among all the people about combat food and water scarcitySincerity among the people about water conservationProper knowledge distribution about importance of water and combat food.Recycling of used water.Determine the hybrid orbital of this molecule
Answer:
sp³ hybridization
Explanation:
Formula to calculate hybridization :
H = 1/2 × [V + U - C + A]
V = number of valence electronsU = number of univalent atomsC = number of cationsA = number of anionsSolving :
⇒ H = 1/2 × [5 - 0 - 0 + 3]
⇒ H = 1/2 × 8
⇒ H = 4
⇒ The molecule has sp³ hybridization
What is the mass of 0.5 moles of NaCl
Answer:
29.25g
Explanation:
m=0.5×(23+35.5)
Answer:
29.25 g
Explanation:
[tex]mole = \dfrac{mass}{molar \: mass}[/tex]
mass = 0.5 × 58.5 [ 23 + 35.5]
= 29.25 gm
would the water in a pond or the water in a full bathtub have more thermal energy? why?
BATHTUB BATHTUB BATHTUB
What is the number of moles of glucose (C,H,O,) in 0.500
of a 0.40
M
solution?
Molarity (M) = Moles of Solute (mol) / Liters of Solution (L)
List Known Quantities into Above Equation
A. Molarity of Glucose Solution = 0.4 M
B. Liters of Glucose Solution = 0.5 L
Substitute Known Quantities into Above Equation
A. 0.4 M = x mol / 0.5 L
Solve for unknown value "x"
A. 0.5 * 0.4 = x
B. x = 0.2 mol of Glucose in the Solution
Write the unbalanced chemical
equation for the following reaction:
butane (C4H10) + oxygen gas yields
carbon dioxide + water
Answer:
C₄H₁₀ + O₂ --> CO₂ + H₂O
Explanation:
The other reactant is stated below the reaction, which is oxygen.
Oxygen is a diatomic element meaning there are usually 2 bonded oxygens. O is incorrect since oxygen is never found as a single atom.
The products are stated below the question. The products are:
- Carbon dioxide
- Water
The chemical formula for carbon dioxide is CO₂
The chemical formula for water is H₂O
Both of the above formulas are very common and are widely known.
THE MOON GOES THROUGH A COMPLETE ORBIT EVERY 27 DAYS ? WHY DOES THIS HAPPEN?
Answer:
Cause the size of the moon is what determines how long it takes so that means the moon is small
Explanation:
Aretha measures a circuit at 110 V and 240 . Using Ohm’s law, what can she calculate for the circuit?
voltage
ohms
resistance
current
Answer:
C 100% correct. trust me
Explanation:
Only when the given temperature and the other physical variables remain constant does Ohm's law apply. Increasing the current causes the temperature to rise in some components. Here the voltage is 110 V and the current is 240, so the resistance can be measured. The correct option is C.
What is Ohm's law?The relationship between electric current and potential difference is stated by Ohm's law. Under the assumption that all physical parameters and temperatures remain constant, Ohm's law asserts that the voltage across a conductor is directly proportional to the current flowing through it.
Most conductors' current is directly proportional to the voltage applied to them. German physicist Georg Simon Ohm was the first to empirically confirm Ohm's law. Ohm's law is one of the most fundamental and significant principles governing electrical circuits.
The equation is V = IR, 'R' is the resistance and 'I' is the current and 'V' is the voltage.
Thus the correct option is C.
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C6H12 + 9 O2 –> 6 CO2 + 6 H2O
How many grams of O2 are consumed when C6H12 is burned to yield 5.3 grams of CO2?
5.76 g of [tex]O_2[/tex] are consumed when [tex]C_6H_1_2[/tex] is burned to yield 5.3 grams of [tex]CO_2[/tex].
What is a mole?A mole is defined as 6.02214076 × [tex]10^{23}[/tex] of some chemical unit, be it atoms, molecules, ions, or others.
Calculating moles of [tex]CO_2[/tex]
Number of mole of [tex]CO_2[/tex] = [tex]\frac{\;Given \;mass}{\;Molar \;mass}[/tex]
[tex]\frac{\;Given \;mass}{\;Molar \;mass}[/tex] = [tex]\frac{5.3g}{44 g/mol}[/tex] = 0.12 mol
As is clear from the reaction stoichiometry, 9 moles of [tex]O_2[/tex]6 moles of [tex]CO_2[/tex].
Calculating the number of moles of [tex]CO_2[/tex]
[tex]\frac{0.12 X 9}{6}[/tex] = 0.18 mol
Mass of [tex]O_2[/tex] =5.76 g
Hence, 5.76 g of [tex]O_2[/tex] are consumed when [tex]C_6H_1_2[/tex] yield 5.3 grams of [tex]CO_2[/tex].
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