The calculated percentage purity of the original sample of calcium carbonate is 44%.
What is excess titration?In the back titration of the excess acid, we neutralize the excess titrand left in a system.
We have the reaction equation;
CaCO3 + 2HCl ----> CaCl2 + H2O + CO2
To get the moles of HCl = 0.2254 M * 20/1000 L = 0.0045 moles
The reaction involving the excess acid occurs thus;
HCl + NaOH ----> NaCl + H2O
Number of moles of NaOH = 0.1041 M * 20/1000 = 0.0021 moles
We have a 1:1 hence 0.0021 moles of HCl reacted also
Number of moles of HCl that reacted with CaCO3 initially = 0.0045 moles - 0.0021 moles = 0.0024 moles
Given the stoichiometry of the reaction, 0.0012 moles of CaCO3 reacted.
Hence;
Mass of pure CaCO3 in the sample= 0.0012 moles * 100 g/mol = 0.12g
Percent purity of the sample = 0.12g/0.2719 g * 100/1
= 44%
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Which statement best summarizes the way the sun produces energy?
A. Combustion reactions in the sun release large amounts of chemical energy.
B. Fusion reactions in the sun release large amounts of chemical energy.
C. Combustion reactions in the sun convert small amounts of matter into large amounts of energy.
D. Fusion reactions in the sun convert small amounts of matter into large amounts of energy.
Answer: D. Fusion reactions in the sun convert small amounts of mayter into large amounts of energy.
The table compares some characteristics of two atoms.
Charged Particles
Atom Number of Neutrons Mass Number
х
6
12
Y
7
13
Use the table to determine the number of protons for each atom. Then, choose the statement below that is true about the two atoms.
The number of protons in X would be 6 while that of Y would also be 6. Thus, the two atoms would be isotopes of the same element.
Atomic properties of atomsThe mass number of an atom is the sum of protons and neutrons present in the atom.
For X with mass number 12 and neutron number 6, the number of protons would be:
12 - 6 = 6 protons
For Y with mass number 13 and neutron number 7, the number of protons would be:
13 - 7 = 6 protons.
Thus, both atoms have the same number of protons, meaning that they are likely isotopes of the same element.
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Which 2 elements has reactivity that is similar to chlorine?
6Li + N2 → 2Li3N chemical word equation
Answer:
this is an Oxidation-reduction
Explanation:
like is w reducing agent, N2 is an oxidizing agent
How many kilograms are present in 6.78x1025molecules of Al2(SO4)3? (hint 1kg=103g)
Atomic masses:
Al = 27
S = 32
O = 16
A) 0.891kg
B) 38.5kg
C) Cannot be determined
D) 8.44kg
mol = 6.78 x 10²⁵ : 6.02 x 10²³ = 112.62
MM Al₂(SO₄)₃ = 2.27 + 3.32+12.16 =342 g/mol
mass = 112.62 x 342 = 38516.04 g = 38.5 kg
The total mass of 6.78*[tex]10^{25}[/tex] molecules of [tex]Al_{2}(SO_{4})^3[/tex] is (b) 38.5 Kg.
To calculate the mass, we need to first understand the values given in the question:1 mole of [tex]Al_{2}(SO_{4})^3[/tex] contains 6.02*[tex]10^{23}[/tex] molecules6.78*[tex]10^{25}[/tex]/6.02*[tex]10^{23}[/tex] moles are in the given amount of [tex]Al_{2}(SO_{4})^3\\[/tex]112.62 moles of [tex]Al_{2}(SO_{4})^3[/tex] is availableWeight of 1 mole [tex]Al_{2}(SO_{4})^3[/tex] is 342 gramsHence, weight of 112.62 moles of [tex]Al_{2}(SO_{4})^3[/tex] = 112.62*342 gramsThe total mass is equal to 38516.04 grams, which is equal to 38.5 Kg.Hence, the total weight of 6.78*[tex]10^{25}[/tex] molecules of [tex]Al_{2}(SO_{4})^3[/tex] is (b) 38.5 Kg.
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Write the full electron configuration for phosphorus, atomic symbol P
Answer:
The electronic configuration for Phosphorus(P) is 1s2,2s2 2p6, 3s2 3p3
the forces that keep liquid particles together are called _____ forces of attraction
Answer:
The forces that keep liquid particles together are called intermolecular forces of attraction.
Predict the missing component in the nuclear equation
11C -> X + 0e
6 1
Answer:
A. Boron-11 with atomic number 5
. Define the term Flame?
Answer:
A hot glowing body of ignited gas that is generated by something on fire.
the carbon atom which becomes asymmetric when the straight chain form of monosaccharide change into ring form is known as____\
Answer:
CARBOHYDRATES AND CARBOHYDRATE METABOLISM
An empty beaker has a measured mass of 27.234 g. When some salt is added to the beaker, the combined mass is 35.9564 g. Calculate the mass of the salt only (show work), reporting your answer to the correct number of significant figures.
The mass of the salt only if 35.9564g is the combined mass of the beaker and the salt is 8.7224g
How to calculate mass?According to this question, an empty beaker has a measured mass of 27.234g. However, when some salt is added to the beaker, the combined mass is 35.9564g.
This means that to calculate the mass of the salt in the beaker, we have to subtract the mass of the empty beaker from the combined mass as follows:
mass of salt only = 35.9564g - 27.234g
mass of salt only = 8.7224g
Therefore, the mass of the salt only if 35.9564g is the combined mass of the beaker and the salt is 8.7224g.
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.
A species is a group of organisms that closely resemble each other in physical appearance and behavior and can mate and produce young that can also mate and produce young. True or false?
false
true
Answer:
True
Explanation:
It's a true statement
Answer:
True
Explanation:
A species is a group of similar organisms that can breed with one another to produce fertile offspring. For example, humans are one species and dogs are another species. Individuals of the same species can reproduce to make more individuals of the same species.
When .080 moles of propane burn at STP, what volume of carbon dioxide is produced?
The answer is 5.4 L (I NEED THE STEPS)
Taking into account the reaction stoichiometry and the definition of STP, 5.4 L of carbon dioxide is produced.
Reaction stoichiometryIn first place, the balanced reaction is:
C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
C₃H₈: 1 mole O₂: 5 moles CO₂: 3 moles H₂O: 4 molesMoles of CO₂ formedThe following rule of three can be applied: if by reaction stoichiometry 1 mole of C₃H₈ form 3 moles of CO₂, 0.080 moles of C₃H₈ form how many moles of CO₂?
[tex]amount of moles of CO_{2} =\frac{0.080 moles of C_{3} H_{8}x3 moles of CO_{2} }{1 mole of C_{3} H_{8} }[/tex]
amount of moles of CO₂= 0.24 moles
Definition of STP conditionThe STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.
Volume of CO₂ producedYou can apply the following rule of three: If by definition of STP 1 mole of CO₂ occupies 22.4 L, 0.24 moles of CO₂ how much volume does it occupy?
[tex]volume of CO_{2} =\frac{0.24 molesx22.4 L}{1 mole}[/tex]
volume of CO₂= 5.376 L ≅ 5.4 L
Finally, 5.4 L of carbon dioxide is produced.
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STP conditions:
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What are two relatively unique physical properties of water? What impact do these properties have on life on Earth?
Answer:
Polar molecule. A neutral, or uncharged molecule that has an asymmetric internal distribution of charge, leading to partially positive and partially negative regions
Cohesion The attraction of molecules for other molecules of the same kind
Adhesion The attraction of molecules for other molecules of a different kind
Density The mass per unit volume of a substance
Specific heat capacity The amount of heat needed to raise the temperature of one gram of a substance by one degree Celsius
Heat of vaporization The amount of energy needed to change one gram of a liquid substance to a gas at constant temperature
Polar substance. a molecule that is neutral or uncharged but has an asymmetric internal charge distribution that produces both positive and negative regions.
What are Physical properties ?Cohesion molecules' attraction to other molecules of the same sort. Adhesion the pull of certain molecules toward others of a different type
Density a substance's mass per unit volume particular heat capacity The amount of heat required to increase a substance's temperature by one degree Celsius in one gram
Vaporization-related heat energy required to convert one gram of a liquid material into a gas at a fixed temperature.
Therefore, Polar substance. a molecule that is neutral or uncharged but has an asymmetric internal charge distribution that produces both positive and negative regions.
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345.50 grams of C6 H12 O6 = how many mol C6H12O6 ? - (MM=180.16g/mol).
100.0grams of O2 = how many mol O2? - (MM=32.00g/mol).
14.37 moles of AgNO3 = how many grams AgNO3? - (MM= 169.87g/mol).
Answer:
0.56 M
Explanation:
We are given;
Mass of glucose solute is 50.50 g
Volume of solution is 500 mL
We are required to calculate the concentration of glucose.
We need to know that, molarity is the concentration of a solution in moles per liter.
Molarity = Number of moles ÷ Molar mass
At 25°C the vapour pressure of pure pentane is 511 torr and that of hexane is 150. torr.
What is the mole fraction of pentane in a pentane-hexane solution that has a vapour pressure of 383 torr at 25°C?
ANSWER IS 6.45×10-1
QUESTION: What is the mole fraction of hexane in the vapour that is in equilibrium with this solution?
(Assume ideal gas behaviour.)
Based on the vapor pressure of the pure substances, the mole fraction of pentane is 0.45 and mole fraction of hexane at equilibrium is 0.60.
What is vapor pressure of a liquid?Vapor pressure of of a liquid is the pressure that is excreted on the walls of a sealed vessel by the molecules of the liquid that have been converted to gaseous phase.
TO determine the mole fraction of pentane in the solution, we use the vapor pressure of the pure substances.
Let the mole fraction of pentane in the mixture be X.
The mole fraction of hexane will be 1 - X
The vapor pressure of the solution = (mole fraction of pentane × vapor pressure of pentane) + (mole fraction of hexane × vapor pressure of hexane)Vapor pressure of solution = 383 torr
(mole fraction of pentane × vapor pressure of pentane) + (mole fraction of hexane × vapor pressure of hexane) = 383 torr
X × 511 + (1 - X) × 150 = 383
511X - 150X + 150 = 383
511X = 233
X = 0.45
Also , at equilibrium, the vapor pressure of pentane = 0.45 × 511 = 230 torr
mole fraction of hexane in the vapor that is in equilibrium with this solution = 230/383
mole fraction of hexane at equilibrium = 0.60
Therefore, the mole fraction of pentane is 0.45 and mole fraction of hexane at equilibrium is 0.60.
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if the concentration of H+ ions in a solution is 3.16 x 10^-4 mol/L then what is the concentration of OH- ions
Answer:
10-4mol/l
[H+]=10-7 , which we call a pH of 7.
This means, for example, that a hydrogen-ion concentration of a solution with a pH of 4 is 10-4mol/l, meaning it contains 0.0001 mol of hydrogen ions in a solution of 1 liter.
Explanation:
3.12×10⁻¹⁰M is the concentration of OH⁻ ions. Concentration in chemistry refers to the quantity of a material in a certain area.
What is concentration?
Concentration in chemistry refers to the quantity of a material in a certain area. The ratio of the solvent in the solution to the solvent or whole solution is another way to define concentration. In order to express concentration, mass every unit volume is typically used. The solute concentration can, however, alternatively be stated in moles or volumetric units.
If a formula describing a shape's boundary is known, it is possible to use integral calculus to determine the volumes of more complex shapes. No object in the dimensions of zero, one, or two has volume; in the dimensions of four and above, the hypervolume is a concept similar to the standard volume.
[H⁺] [OH⁻] = 10 ⁻¹⁴
3.16 x 10⁻⁴ × [OH⁻] = 10 ⁻¹⁴
[OH⁻] = 3.12×10⁻¹⁰M
Therefore, 3.12×10⁻¹⁰M is the concentration of OH⁻ ions.
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Which metal would cause the greatest increase in the temperature of the water in the calorimeter: the
one with the higher specific heat, or the one with the lower specific heat? Explain.
(THE EXPLANATION IS IMPORTANT)
Answer:
The one with higher specific heat
Explanation:
A metal with the highest specific heat will cause the greatest increase in temperature of water in a calorimeter because the metal would hold more heat, and then transfer it to the water.
Answer:
[tex] \sf \: \fbox{Metal \: with \: the \: higher \: specific \: heat.}[/tex]
Explanation:
HEAT:
In the universe there are only two mods of Transfer of Energy one is Heat and another is Work. That's why Heat and Work are well knowns Path function.
Specific Heat:
The specific Heat of any material is the heat gained or released by the material to raise or fall it's temperature by 1°C per unit mass of the material.
The heat gained or released (Q) is directly proportional to the mass of substance(m) and rise or fall of temp(∆T)
given by the equation,
[tex]\sf \: s = \frac{Q}{m \Delta T} [/tex]
Where S is the proportionality constant also known as specific Heat.
S.I. unit of s is joule/kg-K
C.G.S unit is cal/gm °C.
Specific heat of water: s = 4200 J/kg°C
Coming to the next important term calorimeter,
Calorimeter:
We already knew above that heat is not a form of energy it's a mod of transfer of energy, consider One Energy converted from State A to State B then the total heat(Transferred energy) during the process is measured by a device known as Calorimeter.
Now, coming to your question.
Consider a metal, with lower specific heat (s), the equation we derived above tells that specific heat is directly proportional to energy per unit change in temperature, that means if specific heat will be low, lesser amount of Energy(Heat) will be produced which will cause the minor increase in the temperature.
Which is a contradiction hence the answer would be Metal with the higher specific heat.
This is the final answer!
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Which characteristic do all owl families share? A.) small eyes B.) large body size C.) nighttime hunting D.) heart-shaped faces
Need this answer in 5 MINUTES!
If any turtors are out there I need a Verified answer
Heart-shaped faces is the characteristic all owl families share and it is denoted as option D.
What is an Owl?
This is a type of bird which is known for its heart shaped face, big round eyes and reversible toe.
This animal has majority of its species as night time hunters which is why option D was chosen.
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what were possible experimental reasons for error in determining the neutralizing power of antacids ?
1000*
Explanation:
the deter monagex has to neutralize power because of the error and that leads to 1000*
PLEASE john travoltage is safe from getting a static electricity zap right now. there are two things that could change to increase his chances from getting zapped tell me what both if those things are
If he rubs his foot on the carpet or touches the metal doorknob it would increase his chances of being zapped.
Rubbing his feet would be friction.
Touching the doorknob would be potential energy.
Side note: I love the format for this question, was not expecting to see John Travolatge on here today >O< !!!
how do x rays use electromagnetic waves?
Answer:
X-rays are a form of electromagnetic radiation, similar to visible light. Unlike light, however, x-rays have higher energy and can pass through most objects, including the body. Medical x-rays are used to generate images of tissues and structures inside the body.
Explanation:
What happens to a positively charged ion during a chemical change?
Answer:
Positively charged ions move to the negative electrode during electrolysis
Explanation:
Electrolysis is the process by which electric current is passed through a substance to effect a chemical change
I hope I was able to help
A 0.563 M solution of the salt NaA has a pH of 11.56. Calculate the Ka value for the acid HA. Record your answer in scientific notation to 3 sig figs.
Answer:
[tex]\displaystyle K_a = 4.24\times 10^{-10}[/tex]
Explanation:
Write the base reaction of NaA with water:
[tex]\displaystyle \text{A}^-_\text{(aq)}+\text{H$_2$O}_\text{($\ell$)}\rightleftharpoons \text{HA}_\text{(aq)} + \text{OH}^-_\text{(aq)}[/tex]
Hence, the equilibrium constant expression for the reaction is:
[tex]\displaystyle K_b = \frac{[\text{OH}^-][\text{HA}]}{[\text{A}^-]}[/tex]
Thus, to find Ka, we can find Kb and use the fact that Ka × Kb = Kw.
From the reaction and initial concentration of NaA, create an ICE chart:
[tex]\begin{tabular}{llllll} & A^- &\text{H$_2$O} & \rightleftharpoons & HA & OH^- \\I & 0.563 M & \---- & & 0 M & 0 M \\C & -\text{ $ x$} & \---- & & +\text{ $x$ M} & + \text{$x$ M} \\E & \text{(0.563 - $x$) M} & \---- & & \text{$x$ M} & \text{$x$ M} \end{tabular}[/tex]
Find [OH⁻] from the given pH:
[tex]\displaystyle \begin{aligned} \text{pH} +\text{pOH} & = 14.00 \\ \\ \text{pOH} & = 14.00 - \text{pH} \\ \\ & = 14.00 - (11.56) \\ \\ & = 2.44 \\ \\ -\log[\text{OH}^-] & = 2.44 \\ \\ [\text{OH}^-] &= 10^{-2.44} \\ \\ & =0.00363 \text{ M}= 3.63\times 10^{-3} \text{ M} = x\text{ M}\end{aligned}[/tex]
Solve for all species concentrations at equilibrium from the found x value:
[tex]\displaystyle [\text{HA}] = [\text{OH}^-] = 3.63\times 10^{-3} \text{ M}[/tex]
And:
[tex]\displaystyle \begin{aligned} \ [\text{A}^-] & = 0.563 - 3.63\times 10^{-3} \text{ M}\\ \\ & = 0.559\text{ M}\end{aligned}[/tex]
Find Kb:
[tex]\displaystyle \begin{aligned} \displaystyle K_b &= \frac{[\text{OH}^-][\text{HA}]}{[\text{A}^-]} \\ \\ & = \frac{(3.63\times 10^{-3})(3.63\times 10^{-3})}{(0.559)}\\ \\ & = 2.36\times 10^{-5}\end{aligned}[/tex]
Find Ka:
[tex]\displaystyle \begin{aligned} K_a\cdot K_b & = K_w \\ \\ K_a & = \frac{K_w}{K_b} \\ \\ & = \frac{(1.00 \times 10^{-14})}{(2.36\times 10^{-5})} \\ \\ &= 4.24\times 10^{-10} \end{aligned}[/tex]
In conclusion:
[tex]\displaystyle K_a = 4.24\times 10^{-10}[/tex]
Calculate the pH of solution
that has
[H+]of 8.1 x10^-4
Answer:
Explanation:
Calculate the pH of solution
that has
[H+]of 8.1 x10^-4
Question 2 (1 point)
A group of friends is cooking an exotic stew in a house in South Florida. One of the
steps of the recipe is that they have to cool off the cooking mixture from 81.70 °C to
49.10 °C. The pot is too big to put it in a fridge for cooling down faster, the cooking
mixture weighted 34.6 kg. Fortunately, one of the friends remembered
thermochemistry and suggested that they put the pot in the small pool that is at the
house to cool it off faster. The pool was not heated and its temperature before
putting the pot with the stew was 19.24 °C. Given that the mass of water in the pool
was 4,825.6 kg, and the specific heat capacity of the pool is 4.30 J/(g°C) and that of
the cooking mixture is 4.20 J/(g°C), what is the final temperature of the pool after
the cooking mixture cooled down to the temperature needed by the recipe?
Your Answer:
Answer
units
Knowing that the system will attin a state of thermal equilibrium, the final temperature of the system is 19.24°C.
What is Thermochemistry?The term thermochemistry has to do with the heat evolved or absorbed in a chemical reaction.
Now we know that the heat gained by the pool is equal to the heat lost by the stew. Hence;
34.6 * 4.20 * ( 81.70 - T) = 4,825.6 * 4.30 * (T - 19.24)
11873 - 145.3T = 2075008T - 39923153.92
11873 + 39923153.9 = 2075008T + 145.3T
39935026.92 = 2075153.3T
T = 39935026.92/2075153.3
T = 19.24°C
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If a bottle of nail polish remover contains 174 mL of acetone, how much heat would be released by its complete combustion? The density of acetone is 0.788 g/mL .
Answer:
liberates 1790 kJ of heat.
Explanation:
How many grams of CO2 are produced from the burning of 3.0 mol of amyl alcohol?
2C5H11OH + 15O2➡️ 10CO2 + 12H2O
*Please show work
The amount, in grams, of [tex]CO_2[/tex] that would be produced from the burning of 3.0 mol amyl alcohol would be 660.15 grams
Stoichiometric calculationFrom the equation of the reaction:
[tex]2C_5H_1_1OH + 15O2 ---- > 10CO_2 + 12H_2O[/tex]
The mole ratio of amyl alcohol to the [tex]CO_2[/tex] produced is 2:10.
Thus, for 3.0 mol of amyl alcohol, 15 mol of [tex]CO_2[/tex] would be produced.
Mass of 15 mol [tex]CO_2[/tex] = 15 x 44.01 = 660.15 grams
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Calculate the specific heat in J/(g·ºC) of an unknown substance if a 2.50-g sample releases 12.0 cal as its temperature changes from 25.0ºC to 20.0ºC. _________J/(g·°C)
Answer:
[tex]\fbox{c = - 4.01 \: joule/g°C}[/tex]
Step by step explanation:
Given:
Mass of given sample (m) = 2.50 g
Initial temperature (T1) = 25°C
Final temperature (T2) = 20°C
Heat Energy Q = 12 cal
To find:
[tex]Specific \: Heat \: c = \: ?[/tex]
Solution:
We know that,
Specific heat of any substance is directly proportional to the mass and change in temperature.
Represented by equation,
[tex]Q = mc \triangle T[/tex]
Where,
Q = Heat Energy
m = mass of given sample
c = specific heat
∆T = change in temperature
Substituting corresponding values,
[tex]Q = mc \triangle T \\ 12 = 2.5\times c \times (20-25) \\ c = \frac{12}{2.5 \times ( - 5)} \\ c = - 0.96 \: cal/g°C \\ [/tex]
We also know that,
[tex]1 \: cal = 4.184 \: joules[/tex]
multiplying above answer by 4.184,
[tex]c = - 0.96 \times 4.184 \\ \fbox{c = - 4.01 \: joule/g°C}[/tex]
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About how many centimeters will make an inch?
A)5
B)2+
C) 200
D)10
Answer: B) 2+
Explanation:
There are exactly 2.54 centimeters in an inch, the closest option is:
B) 2+
Answer:
2.54 centimetres
Explanation:
Ur options are wrong
