Excess water and impurities. Option A.
Under what conditions can one get over a 100% yield?In the actual sense of it, no chemical reaction can give over a 100% yield. The upper limit cannot be breached. Thus, if more than a 100% yield is obtained, there is a problem somewhere.
One of the problems could be that the product is not sufficiently dried. In other words, excess water has contributed to the yield of the reaction.
The second likely problem could be that at some points during the reaction, impurities have been introduced. The weight of the impurities will add to the actual yield and give a bogus over a 100% yield.
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Help me asap please !
Answer:
15 is not a correct scientific measurement.
Explanation:
Is this helpful for You
Magnesium metal burns with a bright white light . At the end of the reaction , white magnesium oxide powder is produced . Suggest why magnesium is often found in fireworks . Your answer should include a word equation .
The element magnesium is often in fireworks because it burns with bright white light. It adds white sparks and hence, improves the overall brilliance of a firework.
Properties of Magnesium Magnesium metal and its alloys are explosive in nature. They are highly flammable in pure form, powder form, or ribbon formMagnesium reacts violently with waterWhen magnesium metal is burned it reacts with the oxygen present in the air. Magnesium and oxygen react with each other to form magnesium oxide which is a white powder. Magnesium gives its 2 electrons to the oxygen to form this powdered product.The reaction is as follows:
[tex]2Mg (s) + O_2 (g) \rightarrow 2MgO(s) + energy[/tex]
The reaction is exothermic in nature.
It can also reduce water to H₂ gas[tex]Mg(s)+ 2H_2O \rightarrow Mg(OH)_2(s) + H_2 (g)[/tex]
Magnesium reacts with carbon dioxide to form carbon[tex]Mg(s)+CO_2 \rightarrow 2MgO(s)+ C(s)[/tex]
As magnesium is highly flammable and burns with white bright light, hence it is used in fireworks to improve its overall experience.
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Question 2 of 10
What button on a scientific calculator is used to enter a number in scientific
notation?
Answer:
It's the button with the x, and a blank box above it.
Explanation:
Check the attachments, you'll see what it looks like. It will probably look different on your calculator, but the icon should be the same or similar.
Classify the following aqueous solutions as: strong acid, weak acid, neutral, weak base, or strong base.
vinegar pH 3.2
battery acid pH 0.5
shampoo pH 7.0
ammonia pH 11.1
Vinegar pH 3.2: Weak acid
Battery acid pH 0.5: Strong acid
Shampoo pH 7.0: Neutral
Ammonia pH 11.1 Strong base
A 250 mL sample of gas is collected over water at 35°C and at a total pressure of 735 mm Hg. If the vapor pressure of water at 35°C is 42.2 torr, what is the volume of the gas sample at standard pressure?
Answer:
The volume of the gas sample at standard pressure is 819.5ml
Explanation:
Solution Given:
let volume be V and temperature be T and pressure be P.
[tex] V_1=250ml[/tex]
[tex] V_2=?[/tex]
[tex] P_{total}=735 mmhg[/tex]
1 torr= 1 mmhg
42.2 torr=42.2 mmhg
so,
[tex] P_{water}=42.2mmhg[/tex]
[tex] T_1=35°C=35+273=308 K[/tex]
Now
firstly we need to find the pressure due to gas along by subtracting the vapor pressure of water.
[tex] P_{gas}=P_{total}-P_{water} [/tex]
=735-42.2=692.8 mmhg
Now
By using combined gas law equation:
[tex]\frac{P_1*V_1}{T_1} =\frac{P_2*V_2}{T_2}[/tex]
[tex]V_2=\frac{P_1*}{P_2}*\frac{T_2}{T_1} *V_1[/tex]
[tex]V_2=\frac{P_gas}{P_2}*\frac{T_2}{T_1} *V_1[/tex]
Here [tex]P_2 \:and\: T_2[/tex] are standard pressure and temperature respectively.
we have
[tex]P_2=750mmhg \:and\: T_2=273K[/tex]
Substituting value, we get
[tex]V_2=\frac{692.8}{750}*\frac{273}{308} *250[/tex]
[tex]V_2= 819.51 ml[/tex]
The graph shows the amount of a gaseous product formed over time during two trials of a reaction. A different concentration of a reactant was used during each trial while other factors were kept constant.
A graph is shown with two graph lines sloping upwards. The title on the x axis is Time and the title on the y axis is Amount of Product. The graph line with a steeper slope is labeled Trial 2 and the other is labeled Trial 1.
Which of the following statements explains which trial has a higher concentration of the reactant?
Trial 1, because the final amount of product formed is higher.
Trial 1, because this reaction lasted for a longer duration than Trial 2.
Trial 2, because this reaction was initially fast and slowed down later.
Trial 2, because the amount of product formed per unit time is higher.
Trial 1 has a lower concentration of the reactant because the because the average rate of the reaction is lower.
What is a reaction?The term reaction has to do with the combination of reactants in order to yield products. Now we know that the reaction profile is used to show the interaction that exists between the reactants and the products.
The y-axis of the graph is for the amount while the x axis of the graph is the reaction time. The rate of reaction is the time taken for a given amount of products to appear or for a given amount of reactants to disappear.
Thus, from the graph, we can see that trial 1 has a lower concentration of the reactant because the because the average rate of the reaction is lower.
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Answer: D, Trial 2, because the amount of product formed per unit time is higher.
Explanation:
If the concentration is higher, more reactions can occur, causing more product.
In Boston elevation 20 feet, your mass is 75 kg. On top of Mt. Everestt (elevation 29,029 feet) you mass would be
Answer:
75 kg or 75,000 g
Explanation:
Mass is a measurement that describes the amount of matter within an object. This is a constant measurement that does not change regardless of the object's location.
As such, a person's mass would be the same at both elevations.
**Their weight, however, may change.
** 1 kg = 1,000 g
A 34.4 L sample of oxygen gas at 229°C and 752 torr is cooled to 34°C at 668 torr. The volume of the sample is now
L.
Answer:
23.55 L
Explanation:
USe the following 'identity' of gs laws
P1 V 1 / T1 = P2 V2 / T2 ( T must be in Kelvin)
re arrange to
P1 V 1 T2 / (T1 P2) = V2 NOW SUB IN THE VALUES
752 * 34.2 * ( 34 + 273.15) / [( 229 + 273.15) * 668] = V2 = 23.55 L
Which of the following best describes the interaction between water molecules?
Group of answer choices
A. Hydrogen Bonding
B. London Dispersion Forces
C. Dipole-Dipole Forces
D. Van der Waals Forces
Answer:
hydrogen bonding
Explanation:
I just think it is I am not sure
Answer: C. Dipole-dipole interactions.
Which of the following happens when a reaction reaches dynamic equilibrium in a closed system? (4 points)
Group of answer choices
The concentrations of the reactants and products increase.
The concentrations of the reactants and products decrease.
The rate of the forward reaction equals the rate of the reverse reaction.
The rate of the forward reaction is slower than the rate of the reverse reaction.
The rate of the forward reaction equals the rate of the reverse reaction.
What is dynamic equilibrium?When it comes to chemical reactions, a dynamic equilibrium is a condition in which a reversible reaction produces products and reactants at an equal rate.
Dynamic equilibrium can only be achieved in a closed system. That is, a system in which there are no external influences in form of energy, material, or pressure.
For example, consider the following reversible reaction:
[tex]A + B < --- > C + D[/tex]
If the reaction is in dynamic equilibrium, there will not be a net production of reactants and products. In other words, the rate of production of A and B will be the same as the rate of production of C and D.
This is as opposed to static equilibrium in which the production of both reactants and products stops completely after reaching equilibrium.
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URGENT
A 10 M concentrated stock solution of NaCl is used to prepare 3 liters of diluted 1 M solution. Which of the following is true for the process used to achieve the required dilution?
The volume of stock solution used is less than 0.2 liters.
The volume of stock solution used is less than 3 liters.
The volume of the solvent used is less than 0.2 liters.
The volume of the solvent used is more than 3 liters.
Taking into account the definition of dilution, the answer is "The volume of stock solution used is less than 3 Liters."
DilutionWhen it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.
Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volumeVolume of stock solution usedIn this case, you know:
Ci= 10 MVi= ?Cf= 1 MVf= 3 LReplacing in the definition of dilution:
10 M× Vi= 1 M× 3 L
Solving:
Vi= (1 M× 3 L)÷ 10 M
Vi= 0.3 L
In summary, to prepare 3 Liters of 1 M solution, you need 0.3 L of the 10 M concentration stock solution and dilute to 3 L. Therefore, the answer is "The volume of stock solution used is less than 3 Liters."
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The average energy consumption for a new Samsung refrigerator is 5.47 × 10 2 kWh/ye ar. What is the average energy consumption of this refrigerator in gigajoules per day? (Given 1 GJ = 277.8 kWh ) show work.
Answer:
Explanation:
'nsofikldng[ousgafi'fjsngds[sbuofdia
what type of forces which exist in liquid hydrogen fluoride ?
Answer:
H-F is a polar covalent molecule in which dipole-dipole interactions exists
How many moles of solute particles are present in 1 mL (exact) of aqueous 0.0040 M Ba(OH)2?
The number of mole of solute particles are present in 1 mL (exact) of aqueous 0.0040 M Ba(OH)₂ is 0.000004 mole
What is molarity?Molarity is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:
Molarity = mole / Volume
With the above formula, we can determine the number of mole present in the solution. Detail below:
How to determine the mole of the solute in the solutionVolume of solution = 1 mL = 1 / 1000 = 0.001 LMolarity of solution = 0.004 MMole of solute =?Molarity = mole / Volume
Cross multiply
Mole = Molarity × volume
Mole of solute = 0.004 × 0.001
Mole of solute = 0.000004 mole
Thus, the mole of the solute in the solution is 0.000004 mole
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[Ir(NH3)₂CI(CO)] draw cis and trans isomers
The IUPAC name of this compound is diamminecarbonylchloroIridium ..
What are Isomers?Isomers are structure of compund in different forms but they have same molecular mass .
The cis and trans form are given in the picture
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on 1: A piece of unknown metal weighs 348 g. When the metal piece absorbs 6.64 kJ of heat, its temperature increases from 22.4 °C to 43.6 °C.
Answer:
.900 J / g-C°
Explanation:
I assume you are looking for the specific heat of the metal
Specific heat = J / g-C
= 6640 J / 348 g[ (43.6 - 22.4) ] = .900 J / g-C
The specific heat of the unknown metal is approximately [tex]\rm \( 0.90 \, \text{kJ/kg\°C} \)[/tex].
To find the specific heat of the unknown metal, we can use the formula:
[tex]\rm \[ q = m \cdot c \cdot \Delta T \][/tex]
where:
[tex]\rm \( q \)[/tex] = heat absorbed by the metal (in kJ)
[tex]\rm \( m \)[/tex] = mass of the metal (in g)
[tex]\rm \( c \)[/tex] = specific heat of the metal (in kJ/kg·°C)
[tex]\rm \( \Delta T \)[/tex] = change in temperature (in °C)
Given data:
[tex]\( m = 348 \, \text{g} \)\\\( \Delta T = 43.6°C \\\\- 22.4°C = 21.2°C \)\\\( q = 6.64 \, \text{kJ} \)[/tex]
Now, let's rearrange the formula to solve for [tex]\rm \( c \)[/tex]:
[tex]\rm \[ c = \frac{q}{m \cdot \Delta T} \][/tex]
Substitute the values:
[tex]\rm \[ c = \frac{6.64 \, \text{kJ}}{348 \, \text{g} \times 21.2°C} \][/tex]
Convert the mass to kg and temperature to °C:
[tex]\rm \[ c = \frac{6.64 \, \text{kJ}}{0.348 \, \text{kg} \times 21.2\°C} \]\\\\\ c \approx 0.90 \, \text{kJ/kg\°C} \][/tex]
The specific heat of the unknown metal is approximately [tex]\rm \( 0.90 \, \text{kJ/kg\°C} \)[/tex].
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Your question is incomplete, but most probably your full question was,
A piece of unknown metal weighs 348 g. When the metal piece absorbs 6.64 kJ of heat its temperature increases from 22.4°C to 43.6°C. Determine the specific heat of this metal. What is your unknown metal?
Which of these have the highest volume
A. - 1kg of lead
B. - 1kg of iron
C. - 1kg of gold
D. - 1kg of aluminum
Answer:
D. 1kg Aluminium
Explanation:
First of all, you have to know that you were given two quantities, volume and mass.
The relationship between both quantities is given by the formula of density which is:
Density = Mass / Volume
Volume = Mass / Density
Since mass is constant, it means that the volume is inversely proportional to the density.
Volume = k / Density where k is a constant.
This means that the substance with the lowest density would have the highest volume and the one with the highest density would have the highest lowest.
The density of the substances are given as:
Lead = 11.2
Iron = 7.874
Gold = 19.3
Aluminium = 2.7
This means that Aluminium would have the highest volume as its the least dense.
How many grams of NaOH are needed to make a 250.0 mL or a 4.2 M NaOH solution?
Group of answer choices
A. 1.05 grams NaOH
B. 42,000 grams NaOH
C. 42 grams NaOH
D. 1050 grams NaOH
Answer:
C.) 42 grams NaOH
Explanation:
To find the mass of NaOH, you need to (1) find the moles (using the molarity equation) and then (2) convert moles to grams (using the molar mass).
(Step 1)
250.0 mL / 1,000 = 0.2500 L
Molarity = moles / volume (L)
4.2 M = moles / 0.2500 L
1.05 = moles
(Step 2)
Molar Mass (NaOH): 22.990 g/mol + 15.998 g/mol + 1.008 g/mol
Molar Mass (NaOH): 39.996 g/mol
1.05 moles NaOH 39.996 g
----------------------------- x ------------------ = 42 grams NaOH
1 mole
Determine the concentration of a solution (M) made by dissolving 18.8 g of sodium chloride (NaCl) in 750.0 mL of solution.
Answer:
0.429 M
Explanation:
To find the molarity, you need to (1) convert grams to moles (using the molar mass), then (2) convert mL to L, and then (3) calculate the molarity (using the molarity ratio).
(Step 1)
Molar Mass (NaCl): 22.990 g/mol + 35.453 g/mol
Molar Mass (NaCl): 58.443 g/mol
18.8 grams NaCl 1 mole
-------------------------- x ------------------------ = 0.322 moles NaCl
58.443 grams
(Step 2)
1,000 mL = L
750.0 mL 1 L
------------------ x ----------------- = 0.7500 L
1,000 mL
(Step 3)
Molarity (M) = moles / volume (L)
Molarity = 0.332 moles / 0.7500 L
Molarity = 0.429 M
Which would be the best way to represent the concentration of a 1.75 M K2CrO4 solution?
O 1.75% K2CrO4
O [K2CRO4]
(K2CrO4)
K2CRO4, [M] = 1.75
The best way to represent the concentration of a 1.75 M K2CrO4 solution is 1.75% K2CrO4 (option A).
What is molarity?Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.
The molarity is a measure of the concentration of a chemical species, in particular of a solute in a solution, in terms of amount of substance per unit volume of solution.
The molarity is measured in mol/L or M, hence, it can be said that the molarity of a solution is 0.1M.
However, the concentration of a solution is best represented by using %. In accordance with this question, the best way to represent the concentration of a 1.75 M K2CrO4 solution is 1.75% K2CrO4.
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Compare how entropy changes for the following two systems
System A: Solid particles are dissolved in water
System B: Vapor from a gas is condensed
Remember the fact
Randomness follows the order
Gas>Liquid>Solid#System A
As solid particles are dissolved in water their randomness increases so entropy increases
#System B
Gas is converted to liquid so entropy decreases as randomness decreases
Why do you use the same amount of water for each shape of ice?
Answer:
the water level remains the same when the ice melts
Answer:
Because then the shape that it would look would supposed to look like, would be different.
Explanation:
Given the following reaction: 2 NO(g) + O2(g) <--> 2 NO2(g), what is the equilibrium constant (K), if the concentrations at equilibrium are [NO] = 0.0542 M, [O2] = 0.127 M, and [NO2] = 15.5 M?
Group of answer choices
A. K = 2.35 x 102
B. K = 2.54 x 10-1
C. K = 6.44 x 105
D. K = 3.4 x 103
The equilibrium constant of a reaction, [tex]K_{c}[/tex] = 6.44 * 10⁵; option C.
What is equilibrium constant of a reaction?Equilibrium constant, [tex]K_{c}[/tex] of a reaction is a measure of the ratio of the equilibrium concentration of the products of a reaction, to the equilibrium concentration of the reactants; with each concentration raised to the exponent corresponding to the coefficient in the balanced equation of the reaction.
[tex]K_{c} = \frac{(products)^{a}}{(reactants)^{b}}[/tex]
The balanced equation of the given reaction is as follows:
2 NO (g) + O₂ (g) ⇄ 2 NO₂ (g)The concentrations at equilibrium of the species are as follows:
[NO] = 0.0542 M,
[O₂] = 0.127 M, and
[NO₂] = 15.5 M
Equilibrium constant, [tex]K_{c}[/tex] = (15.5)²/(0.127) * (0.0542)²
[tex]K_{c}[/tex] = 6.44 * 10⁵
In conclusion, the equilibrium constant of a reaction, tells on in which direction, the reaction is favored at equilibrium.
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the weak ionization constant (Ka) for HNO2 is equal to:
Answer:
the answer is A
Explanation:
The weak ionization constant (Ka) for HNO₂ is:
[tex]\displaystyle K_a = \frac{[H^+][NO_2^-]}{HNO_2}[/tex]
What is the ionization constant?Acid-ionization constant Ka can be described as a quantitative measure of the strength of an acid in solution. It can be represented as the equilibrium constant for a chemical reaction:
[tex]{\displaystyle {\ce {HA \longrightarrow A^- + H^+}}}[/tex]
The chemical species HA can dissociate into A⁻ the conjugate base of the acid and a hydrogen ion, H⁺. In equilibrium, when the concentrations will not change over time, because both forward and backward reactions have the same rate.
The ionization constant can be described as the ratio of products and reactants raised to stoichiometric powers.
The dissociation constant is defined as:
[tex]{\displaystyle K_{\text{a}}=\mathrm {\frac {[A^{-}][H^{+}]}{[HA]}} }[/tex]
Given the dissociation of the HNO₂ as follows:
HNO₂ ⇄ H⁺ + NO₂⁻
The weak ionization constant (Ka) for HNO₂ is equal to:
[tex]\displaystyle K_a = \frac{[H^+][NO_2^-]}{[HNO_2]}[/tex]
Therefore, option A is correct.
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What is an expression of Boyle's law (k = constant)?
A. V/T=K
B. V = kn
C. PV = k
D. Ptotal= P₁ + P₂ + P3 + &
Answer:
C.) PV = k
Explanation:
Boyle's Law is a variation of the Ideal Gas Law when all variables, except for pressure and volume, are held constant.
Pressure is represented by "P" and volume is represented by "V". In the Ideal Gas Law, pressure and volume are inversely proportional (if one goes up, the other goes down). That being said, the equation which best represents Boyle's Law is PV = k.
Question 6 (Essay Worth 5 points)
(03.04 MC)
What is the name of Pb(NO3)2? Explain how you determined the bond type and the steps you used to determine the naming convention for the compound.
The correct name for the compound is written as lead II trioxonitrate V.
What is the bonding?We know that a compound is formed when atoms are bonded together. The bond that holds atoms together could be ionic, metallic or covalent. We know that in Pb(NO3)2, there is both ionic and covalent bonding.
This is because, the kind of bond between the lead II ion and the nitrate ion is an ionic bond while the bond between the nitrogen and the oxygen atoms in the nitrate ion is covalent bond.
Hence, the correct name for the compound is written as lead II trioxonitrate V.
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what does it mean Emphasis on object vs woman
Emphasis on object vs woman simply means s- e- x- ual objectification
This goes to say that it emphasizes seeing women as objects of se- xu- al pleasure
What is objectification?Objectification simply refers to the act of treating or viewing a person as an object, devoid of thought or feeling.
Most of the time, objectification is targeted at women and reduces them to objects of se- xu- al pleasure
So therefore, emphasis on object vs woman simply means se- xu- al objectification
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If the pressure of 1.5 moles of a gas is 2 atm and the temperature is 27°C, what is the volume of the gas?
Group of answer choices
A. 9.25 L
B. 5.0 L
C. 37.0 L
D. 18.5 L
Answer:
D
Explanation:
Ideal gas law PV = n RT R = .082057 T must be in Kelvin
n = moles
V = n RT / P
= 1.5 (.082057) ( 27+ 273.15) / 2 = 18.5 liters
What is the isotopic symbols for
Beryllium atom that contains 9 nucleon?
Answer:
Beryllium-9 is the isotope of beryllium with relative atomic mass 9.
2C2H2(g)+5O2(g)=4CO2(g)+2H2O(g)
How many liters of C2H2 are required to product 12.0 moles CO2, assuming the reaction is at STP?
The volume of ethyne, C₂H₂ required to produce 12 moles of CO₂ assuming the reaction is at STP is 134.4 L
Balanced equation2C₂H₂(g) + 5O₂(g) --> 4CO₂(g) + 2H₂O(g)
From the balanced equation above,
4 moles of CO₂ were produced by 2 moles of C₂H₂
How to determine the mole of C₂H₂ needed to produce 12 moles of CO₂From the balanced equation above,
4 moles of CO₂ were produced by 2 moles of C₂H₂
Therefore,
12 moles of CO₂ will be produce by = (12 × 2) / 4 = 6 moles of C₂H₂
How to determine the volume (in L) of C₂H₂ needed at STPAt standard temperature and pressure (STP),
1 mole of C₂H₂ = 22.4 L
Therefore,
6 moles of C₂H₂ = 6 × 22.4
6 moles of C₂H₂ = 134.4 L
Thus, we can conclude that the volume of C₂H₂ needed for the reaction at STP is 134.4 L
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