the quantity PV/T must be held constant and both P and V are doubled, the value of T will necessarily have to,
A piece of copper absorbs 5000 J of energy and undergoes a temperature change from 100 °C to 200 °C. What is the mass of the piece of copper?
Group of answer choices
A. 12.9 grams
B. 129.9 grams
C. 0.385 grams
D. 1290 grams
Answer:
B.) 129.9 grams
Explanation:
To find the mass, you need to use the following equation:
Q = mcΔT
In this equation,
-----> Q = energy (J)
-----> m = mass (g)
-----> c = specific heat (J/g°C)
-----> ΔT = change in temperature (°C)
The specific heat of copper is 0.385 J/g°C. Knowing this, you can plug the given values into the equation and simplify to isolate "m".
Q = mcΔT <----- Equation
5000 J = m(0.385 J/g°C)(200 °C - 100 °C) <----- Insert values
5000 J = m(0.385 J/g°C)(100) <----- Subtract
5000 J = m(38.5) <----- Multiply 0.385 and 100
129.9 = m <----- Divide both sides by 38.5
Prform the following operation and express the answer in scientific notation 6.0 x 10^3-2.310^3
The value 6.0 x 10^3- 2.3 × 10^3 in scientific notation is 3.7 × 10^3.
What is scientific notation?Scientific notation is a way to write very large or very small numbers so that they are easier to read and work with.
You express a number as the product of a number greater than or equal to 1 but less than 10 and an integral power of 10 .
Why it is used?There are two reasons to use scientific notation.
The first is to reveal honest uncertainty in experimental measurements. The second is to express very large or very small numbers so they are easier to read.Given,
= 6.0 x 10^3- 2.3 × 10^3
= (6.0 - 2.3) × 10^3
= 3.7 × 10^3
Thus, we find that the value 6.0 x 10^3- 2.3 × 10^3 in scientific notation is 3.7 × 10^3.
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A gram of gasoline produces 45.0kJ of energy when burned. Gasoline has a density of 0.77/gmL. How would you calculate the amount of energy produced by burning 13.L of gasoline?
Set the math up. But don't do any of it. Just leave your answer as a math expression.
Also, be sure your answer includes all the correct unit symbols.
how do I set up the math?
Answer:
See below
Explanation:
45 kJ / gm * .77 gm / liter * 13 liter = _________ kJ
Burning 13 L of gasoline would produce 450,450 kJ of energy. For calculating the amount of energy produced by burning 13 L of gasoline, we can use the given information that 1 gram of gasoline produces 45.0 kJ of energy when burned and the density of gasoline is 0.77 g/mL.
First, we need to convert the volume of gasoline from liters to milliliters since the density is given in grams per milliliter.
13 L = 13,000 mL
Next, we can calculate the mass of the gasoline using the density:
Mass = Volume x Density
Mass = 13,000 mL x 0.77 g/mL
Mass = 10,010 g
Now, we can calculate the amount of energy produced by multiplying the mass of gasoline by the energy produced per gram:
Energy = Mass x Energy per gram
Energy = 10,010 g x 45.0 kJ/g
Energy = 450,450 kJ
Therefore, burning 13 L of gasoline would produce 450,450 kJ of energy.
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How many molecules of H₂S are required to form 79.0 g of sulfur according to the following reaction? Assume excess SO2.
2 H₂S(g) + SO2(g) → 3 S(s) + 2H₂O(1)
Answer:
9.89 x 10²³ molecules H₂S
Explanation:
To find the molecules of H₂S, you need to (1) convert grams S to moles S (via the atomic mass of sulfur), then (2) convert moles S to moles H₂S (via the mole-to-mole ratio from equation coefficients), and then (3) convert moles H₂S to molecules H₂S (via Avogadro's Number). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the sig figs of the given value.
Atomic Mass (S): 32.065 g/mol
2 H₂S(s) + SO₂(g) -----> 3 S(s) + 2 H₂O(l)
Avogadro's Number:
6.022 x 10²³ molecules = 1 mole
79.0 g S 1 mole 2 moles H₂S 6.022 x 10²³ molecules
--------------- x --------------- x ---------------------- x ------------------------------------- =
32.065 g 3 moles S 1 mole
= 9.89 x 10²³ molecules H₂S
1. Consider the unbalanced equation:
Al4C3 (s) + H2O (l) ---> Al(OH)3 (s) + CH4 (g)
How many moles of H2O are needed to react with 1.48 moles of Al4C3 ?
Hint: Write the balanced equation first
2.
Consider the balanced equation:
2 CH4 (g) + 3 O2 (g) + 2 NH3 ---> 2 HCN (g) + 6 H2O (g)
If 203.6 g of NH3 is reacted with excess CH4 and O2, what mass in grams of HCN is produced?
Answer:
1.) 17.76 moles H₂O
2.) 323.1 g HCN
Explanation:
1.) An equation is balanced when there is an equal amount of each element on both sides of the reaction. The quantities can be modified by adding coefficients in front of the molecules.
The unbalanced equation:
Al₄C₃(s) + H₂O -----> Al(OH)₃(s) + CH₄(g)
Reactants: 4 aluminum, 3 carbon, 2 hydrogen, 1 oxygen
Products: 1 aluminum, 1 carbon, 7 hydrogen, 3 oxygen
The balanced equation:
Al₄C₃(s) + 12 H₂O -----> 4 Al(OH)₃(s) + 3 CH₄(g)
Reactants: 4 aluminum, 3 carbon, 24 hydrogen, 12 oxygen
Products: 4 aluminum, 3 carbon, 24 hydrogen, 12 oxygen
Now that the equation is balanced, you can use the relevant coefficients to construct a mole-to-mole ratio. This will allow you to convert between moles Al₄C₃ to moles H₂O.
1.48 moles Al₄C₃ 12 moles H₂O
---------------------------- x ------------------------ = 17.76 moles H₂O
1 mole Al₄C₃
2.) To find the mass of HCN, you need to (1) convert grams NH₃ to moles NH₃ (via molar mass), then (2) convert moles NH₃ to moles HCN (via mole-to-mole from equation coefficients), and then (3) convert moles HCN to grams HCN (via molar mass). It is important to arrange the coefficients in a way that allows for the cancellation of units.
Molar Mass (NH₃): 14.009 g/mol + 3(1.008 g/mol)
Molar Mass (NH₃): 17.033 g/mol
Molar Mass (HCN): 1.008 g/mol + 12.011 g/mol + 14.009 g/mol
Molar Mass (HCN): 27.028 g/mol
2 CH₄(g) + 3 O₂(g) + 2 NH₃(g) ------> 2 HCN(g) + 6 H₂O(g)
203.6 g NH₃ 1 mole 2 moles HCN 27.028 g
--------------------- x ---------------- x ------------------------ x ----------------- =
17.033 g 2 moles NH₃ 1 mole
= 323.1 g HCN
What is the component concentration ratio, [CH3COO−]/[CH3COOH], of a buffer that has a pH of 4.650? (Ka of CH3COOH = 1.8 × 10−5)
Answer:
Refer to the attached page,
I've done the calculation over there
At the equivalence point of a titration of the [H+] concentration is equal to:
Group of answer choices
A. 1 x 107 M
B. 7
C. [OH-]
D. 1 x 10-7 M
B. At the equivalence point of a titration of the [H+] concentration is equal to 7.
What is equivalence point of a titration?The equivalence point of a titration is a point in titration at which the amount of titrant added is just enough to completely neutralize the analyte solution.
At the equivalence point in an acid-base titration, moles of base equals moles of acid and the solution only contains salt and water.
At the equivalence point, equal amounts of H+ and OH- ions combines as shown below;
H⁺ + OH⁻ → H₂O
The pH of resulting solution is 7.0 (neutral).
Thus, the pH at the equivalence point for this titration will always be 7.0.
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Which of the following IS a part of the Kinetic Molecular Theory (KMT)?
Group of answer choices
A. Molecules in a gas move slowly.
B. Molecules in a gas move rapidly.
C. Molecules have HUGE volumes.
D. Molecules have predictable motions.
The statement that is a part of Kinetic Molecular Theory (KMT) is Molecules in a gas move rapidly. That is option B.
What is Kinetic Molecular Theory (KMT)?Kinetic Molecular Theory (KMT) is defined as the theory that describes the physical behaviour of gases.
The Kinetic Molecular Theory (KMT) include the following:
Ideal gas molecules are constantly moving; They have negligible volume;They have negligible intermolecular forces; They undergo perfectly elastic collisions; and They have an average kinetic energy proportional to the ideal gas's absolute temperature.Therefore, the statement that is a part of Kinetic Molecular Theory (KMT) is Molecules in a gas move rapidly.
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write three disadvantages of hard water.
The three disadvantages of hard water are:
1. Hard water is unsuitable for washing because soap does not readily create a lather in it.
2. Soap may react and produce, wasting the soap.
3. Due to the development of calcium and magnesium carbonates, tea kettles will get furred.
Hard waterWater that contains a lot of minerals is referred to as hard water. In limestone, chalk, or gypsum deposits, which are mostly composed of calcium and magnesium carbonates, bicarbonates, and sulphates, hard water is created as a result of percolation. A moderate health advantage from drinking hard water is possible. In industrial settings where water hardness is regulated to prevent expensive breakdowns in boilers, cooling towers, and other water-handling equipment, it can present serious issues. Hard water is frequently detected in home settings by the build-up of lime scale in kettles and water heaters as well as by the absence of foam when soap is agitated in water. Wherever there is a worry about water hardness, water softening is frequently employed to lessen the negative impacts of hard water.
write three disadvantages of hard water.
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is Cu^2+ + 2Br^- --> Cu + Br2 a spontaneous or non-spontaneous redox reaction?
The reaction above is a spontaneous reaction
Cu^2+ + 2Br^- --> Cu + Br2
What is spontaneous redox reaction?A spontaneous redox reaction is a special type of redox reaction which involves the release of energy where the electrons are transferred from from an anode to the cathode
General spontaneous redox reactions is found mostly in electrochemical cells
So therefore, the reaction above is a spontaneous reaction.
Cu^2+ + 2Br^- --> Cu + Br2
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What volume of hydrogen (in L) is produced
from the complete reaction of 56.49 g of
magnesium metal at STP?
(Mg = 24.30 g/mol)
Mg(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g)
Hint: 1 mole of gas at STP occupies 22.4 L
Answer:
52.07 L H₂
Explanation:
Before you can find the volume of H₂, you need to find the moles of H₂. To do this, you need to (1) convert grams Mg to moles (via the atomic mass) and then (2) convert moles Mg to moles H₂ (via the mole-to-mole ratio from equation coefficients).
Atomic Mass (Mg): 24.30 g/mol
1 Mg(s) + 2 HCl(aq) ---> MgCl₂(aq) + 1 H₂(g)
^ ^
56.49 g Mg 1 mole 1 mole H₂
------------------- x ----------------- x -------------------- = 2.32 moles H₂
24.30 g 1 mole Mg
Now that you know the moles of H₂, you need to determine the volume at STP. To do this, you need to set up a proportion comparing the mole value versus the volume. Then, you can cross-multiply to solve for the unknown volume. The final answer should have 4 sig figs to match the given values.
1 mole 2.32 moles
-------------- = -------------------- <----- Set up proportion
22.4 L ? L
(1 mole) x ? L = 52.07 <----- Cross-multiply
? L = 52.07 <----- Divide both sides by 1 mole
Using standard heats of formation, calculate the standard enthalpy change for the following reaction.
C2H4(g) + H2O(g) ------> CH3CH2OH(g)
The enthalpy change of the reaction is -44.79 kJ/mol.
What is the enthalpy change?We can define the enthalpy change as the energy that is given out or taken in in a reaction. it can be calculated from the enthalpies of formation of species by the use of the relation;
ΔH = ∑Enthalpy of formation of products - ∑Enthalpy of formation of reactants
ΔHfC2H4(g) = +52kJ/mol
ΔHf H2O(g) = - 241.82 kJ/mol
ΔHf CH3CH2OH(g)= -234.61 kJ/mol
ΔHrxn = (-234.61) - [52 + (- 241.82 )]
ΔHrxn = (-234.61) - (-189.82)
ΔHrxn = -44.79 kJ/mol
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Nuclear explosions require a specific amount of mass to trigger and self-sustain a nuclear chain reaction. That mass is called the
Answer:
Explanation:
The term you want is the critical mass. It is the mass needed to trigger a nuclear reaction and keep it going.
Approximately 104 pounds of Uranium 235 is needed for the critical mass to occur. If it is less than 104 pounds, no reaction will occur.
Which best explains the effect of chemicals on the environment?
O A. Chemicals are only harmful to the environment.
OB. Chemicals do not affect the environment.
C. Chemicals are only helpful to the environment.
OD. Chemicals can be helpful or harmful to the environment.
The best effect of chemicals on the environment is that Chemicals can be helpful or harmful to the environment.
Environmental chemical compounds seek advice from a chemical compound or chemical element present in air, water, meals, soil, dust, or other environmental media which includes customer merchandise.
Chemical substances can be toxic due to the fact they are able to harm us after they enter or touch the frame. exposure to a poisonous substance together with fuel can have an effect on your fitness. due to the fact that drinking gas can motive burns, vomiting, diarrhea and, in very huge amounts, drowsiness or dying, it's far poisonous.
Nutrient loading from over-fertilization can bring about runoff that causes damaging consequences in aquatic ecosystems. sizable publicity to, or misuse of, insecticides can damage non-centered plants and animal, as well as lead to improvement of pesticide-resistant pest species.
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A crystal of potassium permanganate is placed in a beaker of water. The purple colour of potassium permanganate gradually spreads throughout the water by diffusion Explain, using the kinetic particle theory, how this process occurs.
When the crystals of potassium permanganate are preserved in water, the purple-coloured crystals of potassium permanganate break further into smaller particles that populate the distance between the molecules of water imparting a purple colour to the water. This is an example of diffusion.
What are the two conclusions given out in the method of diffusion?
Diffusion is the process of movement of solvent from higher concentration to lower concentration through a semipermeable membrane. So, we can form the decision that it cannot occur through a thick membrane from which small molecules cannot pass through.
What is difference between osmosis and diffusion?Osmosis is the direction of solvent particles from a solution that is diluted to a more concentrated one. In contrast, diffusion is the movement of particles from a higher concentration region to a part of lower concentration.
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If the pressure is doubles and the temperature is held constant what will happen to the volume of a gas?
Group of answer choices
A. Quadrupled
B. Doubled
C. Reduced by Half
D. Reduced by a Fourth
Answer:
C
Explanation:
Of course increasing the pressure will reduce the volume
P1V1 = P2V2
P1V1/P2 = V2 WHEN P2 = 2 P1----multiply both sides by 1/2
P1 V1 / 2P1 = 1/2 V2 <===== 1/2 the original
Calculate the molality of a 5.51 M ethanol (C2H5OH) solution whose density is 0.9349 g/mL
Molality of C2H5OH is 1.1.27m.
What is Molality?
Molality is no.of moles present in One Kg solution .
Molality is represented by m
m= no.of moles/ weigt of solution in kg
Given is Molarity= 51.30M
molar mass of C2H5OH is 46g / mol , Density =0.9349g/ ml
Density=m/V
V = 107 ml
Molarity= no of moles/ Volume
51.5×46×107= x × 1000
weight of C2H5OH = 27.7g
molality = 27.7/1000××46
m= 1.27m
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Definition
a visual representation of data that uses unconnected plotted points
What is the equilibrium constant for the reaction
Answer:
B.) [tex]K_{eq} = \frac{[SO_3][NO]}{[SO_2][NO_2]}[/tex]
Explanation:
The general equilibrium expression looks like this:
[tex]K_{eq} = \frac{[C]^c[D]^d}{[A]^a[B]^b}[/tex]
In this expression,
-----> K = equilibrium constant
-----> uppercase letters = formulas
-----> lowercase letters = balanced equation coefficients
The products are in the numerator and the reactants are in the denominator. Since all of the molecules are gases, they should all be included in the expression. Since the coefficients in the balanced equation are all 1, they do not need to be represented in the expression.
The equilibrium constant expression is:
[tex]K_{eq} = \frac{[SO_3][NO]}{[SO_2][NO_2]}[/tex]
Difference between jaanto and panighatta..
Answer:
they're both completely different games
Explanation:
Answer: uh.. tricky
Explanation:
If a chemical reaction produces 20.0 grams of product, but by stoichiometry it is supposed to have 25.0 grams of product; what is the percent yield of the reaction?
Group of answer choices
A. 125%
B. 75%
C. 20%
D. 80%
Using the periodic table, choose the more reactive non-metal.
S or As
Answer:
Sulfur
Explanation:
In general, elements are more reactive the more electronegative they are. The most electronegative elements are at the top-right of the periodic table. Since sulfur (S) is one unit up and one unit to the right of arsenic (As), it is considered more electronegative, and therefore more reactive, than arsenic.
For the following questions state the oxidation number of the element in the given compound.
1. sul fur in Li2SO#3
2. chlorine in MgCl2
3.Silicon in SiO2
4.sul fur in H2SO4
5.Sulfur in SO4^2-
6. manganese in MnO4^-
7. Cr in Cr2O7^2-
in the periodic tables
elements in the same column have the same charge
in a compound oxidation numbers have to equal 0
1.
sulfur in Li2SO3
charges :
Li = +1 S = +4 O = -2
multiply the charge with the subscripted number next to the element
Li = +1
Li2 = +2
O = -2
O3 = -8
in a compound oxidation numbers have to equal 0
+2 S -6 = 0
S -4 = 0
S = +4
Sulfur = +4
2.
MgCl2
Mg = +2
+2 Cl2 = 0
Cl2 = -2
Cl by itself = -2 divided by 2 = -1
Chlorine = -1
3.
SiO2
Silicon = +4
4.
Sulfur in H2SO4
H: +1 S: +6 O: -2
H2SO4
H2 : +2 O4: -8
+2 +S -8 = 0
S - 6 = 0
S = +6
Sulfur = +6
5.
Sulfur in SO4^2-
Sulfur in SO4
Sulfur = +4
6.
Manganese in MnO4^-
Manganese in MnO4
Manganese = +4
7.
Cr2O7^2-
Dichromate
Cr in Cr2O7^2- or Cr2O7-2-
Cr: +6 O: -2
How many moles of NaOH are in a 356 mL solution that has a concentration of 7.2 M?
Answer:
2.56 moles
Explanation:
7.2 M is 7.2 moles/L
356 mL = .356 Liters
x moles / .356 Liters = 7.2 M (moles/L)
x = .356 * 7.2 = 2.5632 moles
1. Calculate the average atomic mass of rubidium. Rubidium has two isotopes, 85Rb and 87Rb. 85Rb has an atomic mass of 84.912 amu and occurs at an abundance of 72.17%. 87Rb has an atomic mass of 86.909 amu and occurs at an abundance of 27.83%. Show your work
What is the pH of a 0.0100 M sodium benzoate solution? Kb (C7H5O2-, ) = 1.5 x 10^-10. Show how it is worked out.
The pH of a 0.0100 M sodium benzoate solution is determined as 8.09.
What is pH of a solution?The pH of a solution is a measure of hydrogen (H+) ion concentration, which is, in turn, a measure of acidity of the solution.
pH is can also be determined from pOH of the solution as shown below;
pH = 14 - pOH
pH of the benzoate solutionlet the hydroxyl concentration, OH = x
x²/M = kb
x²/0.01 = 1.5 x 10⁻¹⁰
x² = 1.5 x 10⁻¹²
x = √(1.5 x 10⁻¹²)
x = 1.2247 x 10⁻⁶
pOH = - log(OH⁻)
pOH = -log( 1.2247 x 10⁻⁶)
pOH = 5.91
Calculate the value of the pHpH = 14 - 5.91
pH = 8.09
Thus, the pH of a 0.0100 M sodium benzoate solution is determined as 8.09.
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2Al(s)+Fe2O3(s) → Al2O(s)+2Fe(s) with a delta H=-847 KJ.
Railroad maintenance initiates a thermite reaction of 4.0 mol Al to connect two lengths of rail using the reaction above. How much heat is released during the reaction?
∆H for given reaction -847kJ
As it's negative reaction is exothermicSo
2 mol of Al releases 847KJ heat
4 mol Al releases
2(847)1694KJ∆H=-1694KJ
It is given that the energy released during the reaction of 2 moles of Al metal is - 847 KJ. The n the heat energy released by 4 moles of Al will be - 1694 KJ.
What is reaction enthalpy?The enthalpy change of a reaction is the heat energy absorbed or released by a reaction. For an endothermic reaction, the heat energy is absorbed and the enthalpy change is positive. For an exothermic reaction, where the energy is released, the enthalpy change will be negative.
The heat energy change during a reaction is equal to the product of mass, specific heat and temperature difference of the substanc eunder reaction or phase transition.
Given that, the heat evolved by 2 moles of Al is - 847 kJ. Then, the heat evolved when 4 moles of Al reacted is calculated as follows:
(4 × - 847) / 2 = - 1694 KJ.
Therefore, the heat energy released is - 1694 KJ.
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Given the reaction:
N2(g) + 3 H2(g) <--> 2 NH3(g)
If the system is at equilibrium, what will happen is pressure is added?
Group of answer choices
A. Nothing. Pressure does not affect equilibrium position.
B. The reaction will shift to the right to produce more product.
C. All of the above
D. The reaction will shift to the left to produce more reactants
Answer:
B.) The reaction will shift to the right to produce more product.
Explanation:
When the pressure of a reaction is increased, the equilibrium shifts to the side with less moles of gas.
You can determine the moles of gas by adding the coefficients on each side of the reaction. The reactants have 4 moles of gas (1 + 3 = 4) and the products have 2 moles of gas. Since there are less moles of gas on the product side, the equilibrium will shift to that side. As such, more product will be produced.
Predict and Balance the following reaction:
Na + H2O →
Group of answer choices
A. 2Na + 2H2O → 2NaOH + H2
B. No Reaction Occurs
C. Na + H2O → NaOH2
D. 2Na + H2O → Na2O + H2
A. The balanced chemical reaction of Sodium metal and Water is 2Na + 2H₂O → 2NaOH + H₂.
What is a balanced chemical equation?A balanced equation contains the same number of each type of atoms on both the left and right sides of the reaction arrow.
Reaction of Sodium metal and WaterSodium metal reacts rapidly with water to form a colourless solution of sodium hydroxide (NaOH) and hydrogen gas (H2).
The balanced chemical reaction is written below;
2Na + 2H₂O → 2NaOH + H₂
Thus, the balanced chemical reaction of Sodium metal and Water is 2Na + 2H₂O → 2NaOH + H₂.
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