Answers
Answer:
122.7 mL
Explanation:
Step 1: Given data
Volume of water: 100.0 mLMass of the piece iron (m): 178.5 gDensity of iron (ρ): 7.87 g/mLStep 2: Calculate the volume of the piece of iron
Density is equal to the mass of the piece divided by its volume.
ρ = m/V
V = m/ρ
V = 178.5 g/(7.87 g/mL) = 22.7 mL
Step 3: Calculate the volume of the mixture
The volume of the mixture is equal to the sum of the volume of water and the iron piece.
100.0 mL + 22.7 mL = 122.7 mL
Related Questions
What type of compound is represented by the graph at right? A. strong base B. strong acid C. weak base D. weak acid
Answers
The type of compound represented by the graph at right is a strong acid (option B).
What is a strong acid?An acid is generally any compound capable of dissociating into its respective constituent ions when in an aqueous solution.
An acid is categorised as strong or weak depending on whether it can dissociate completely or partially. A strong acid dissociates completely in water.
According to this question, HA, when added to water, dissociates into H+ and A- ions, hence, is a strong acid.
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How many moles of calcium chloride are there when you have 55.5 grams of calcium chloride(CaCl2)
Answers
Answer:
0.5mol
Explanation
Please mark answer as brainliest
Please Help me ASAP - Next 90 minutes!! With my Homework Assignment!
100 Points + Brainliest if correct! Both questions please!!!!
Answers
Answer:
see below
Explanation:
1) here we are given that one mole of propane releases 2221kJ of energy.
now use unitary method as ,
to burn 1 mol (44g) propane 2221kJ of energy is required
to burn 1g of propane 2221kJ/44g of energy is required
therefore to burn 25g of propane 2221/44*25kJ of energy is required= 1261.93kJ ≈ 1262 kJ
Hence 1262kJ of energy is required to burn 25g propane.
2) amount of heat absorbed= 25kJ
amount of work done = 12J
change in energy= (25-12)kJ = 13kJ
Hence the value of ∆E is 13kJ .
and we are done!
You have a small block of gallium that has a mass of 2.5g. How much heat was required to raise its temperature from 22.0 Celsius to 29.8 Celsius?
Answers
To solve this question, we have to use the formula of heat transfer which is given as
\(\begin{gathered} Q=mc\Delta\theta \\ m\text{ = mass} \\ c\text{ = specific heat capacity} \\ \Delta\theta\text{ = change in temperature} \end{gathered}\)Let us define our variables and proceed to substitute the values in the equation.
\(\begin{gathered} m\text{ = 2.5} \\ c\text{ = 0.37J/}g\text{ K} \\ \Delta\theta\text{ = (29.8 - 22.0) = 7.8} \end{gathered}\)Substituting the values, we would have
\(\begin{gathered} Q=mc\Delta\theta \\ Q=2.5\cdot0.37\cdot7.8=7.215J \end{gathered}\)From the calculations above, the heat transfer in the block was 7.215J
20 points!!!!!!!!UNIT 3 LAB The Art Forger Who Tricked the Nazis Where did the trial take place? What was the defendant accused of? What was strange about his defense? How did Han van Meegeren manage to forge the works of art so well? What did he do to make them look authentic? How could forensic testing have changed this case? What ultimately happened to van Meegeren? Money to Run, But No Skills to Hide How did Schrenker try to fake his own death? How did he get caught? Why is creating a new state ID harder to do these days? Why is it so difficult to fake a passport? What is the easiest way for criminals to obtain a passport? Why does Mr. Abagnale claim it is easy to get a fraudulent passport? What steps does someone have to take to make this happen? Why was Mr. Abagnale arrested? What happened to him after his arrest?
Answers
The Art Forger Who Tricked the Nazis:
The trial took place in Dutch.The defendant was accused of forging art.He admitted to his crime.Han van Meegeren studied the old masters.He made paint mixtures using the pigments and oil from the era of each artist.The use of resins to prove forgery.He was released at first and later jailed for 1 year for selling the paintings to the Nazis.What are the details of Money to Run, But No Skills to Hide?Schrenker crashed his plane and made a fake call. He mail his friend. It is harder to create a fake ID now because of increased security features. With all of the security features, it is not an easy thing to master. To take a legitimate one.
Mr. Abagnale believes that all that is required to obtain a birth certificate is a child's death record from a courthouse. A birth certificate and some white-out on an apartment lease gets you a driver's license, which gets you a passport.
He despised what he was doing and became lonely. He was eventually imprisoned for everything.
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PLEASE SOLVE THIS QUESTION.
VERY MUCH IMPORTANT
Answers
Answer:
\(thank \: you\)
Part 2:Construct a graph of temperature versus time. Put temperature on the y-axis and time on the x-axis. Graph all three sets of data on the same graph. Use a different colored pencil for each test material. Provide a key on the graph relating the pencil color to the test material. Calculate the change in temperature from start to finish for the air and each of the samples and record on your data sheet. Which water sample lost the least amount of heat energy over the 6-minute time interval? Was the rate of heat loss constant during each experiment? How can you tell? Which material was the best insulator? Which material was the least effective insulator? Write a summary paragraph discussing this experiment and the results. Summarize the conclusions that you can draw from this experiment. Explain why the design of the bird's nest provides good insulation for the eggs
Answers
The change in temperature from start to finish for the air and each of the samples would be calculated by subtracting the initial temperature from the final temperature. For example, if the initial temperature of the air was 20°C and the final temperature was 15°C, the change in temperature would be -5°C.
The water sample that lost the least amount of heat energy over the 6-minute time interval would be the one with the smallest change in temperature. In the example above, if the change in temperature for water sample 1 was -3°C and the change in temperature for water sample 2 was -4°C, water sample 1 would have lost the least amount of heat energy.
The rate of heat loss was not constant during each experiment because the slope of the lines on the graph is not constant. The slope of the line represents the rate of heat loss, and if the slope is not constant, the rate of heat loss is not constant.
The material that was the best insulator would be the one with the smallest change in temperature. In the example above, water sample 1 would be the best insulator because it had the smallest change in temperature.
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Please help will provide good points.
Answers
The possible combinations are;
1) n = 5, l = 2, ml = 0, ms = -1/2
2) n = 3, l = 1, ml = -1, ms = +1/2
What are quantum numbers?We know that quantum numbers are used to show the position of the electron in an atom. The quantum number shows us the position or the place that we could be able to locate a particular electron that is under study. Recall that the region in space where there is a high probability of finding the electron is called the orbital.
The following are the possible combinations of quantum numbers for a given electron;
1) n = 5, l = 2, ml = 0, ms = -1/2
2) n = 3, l = 1, ml = -1, ms = +1/2
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Question 1 of 30
What is the change in entropy (AS) when a solid substance decomposes and
produces gaseous products?
A. 1
B. Greater than 0
C. 0
D. Less than 0
SUBMIT
Answers
Greater than 0 is the change in entropy (AS) when a solid substance decomposes and produces gaseous products. The correct option is B.
The change in entropy (ΔS) is a measure of the degree of randomness or disorder in a system. When a solid substance decomposes and produces gaseous products, the number of particles (molecules or atoms) in the system increases, and the arrangement of the particles becomes more disordered. This results in an increase in entropy, which is greater than 0.
When a solid substance decomposes and produces gaseous products, the change in entropy (ΔS) is greater than 0. This is because the number of particles in the system increases, leading to an increase in disorder or randomness.
The entropy of a system is a measure of the degree of disorder, and it tends to increase in processes that lead to a greater dispersion of energy or matter. In the case of the decomposition of a solid substance into gaseous products, the transition from a more ordered solid state to a more disordered gas state leads to an increase in entropy.
This phenomenon is a manifestation of the second law of thermodynamics, which states that the entropy of a closed system tends to increase over time.
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Consider the reaction: CO (g) + 2 H2 (g) ⇌ CH3OH (g) where the Kp is 2.26 x 10^4 at 25°C. Calculate ΔGrxn for the reaction at 25°C under standard conditions.
Answers
The standard Gibbs free energy change of the reaction at 25°C is -18,262 J/mol.
What is energy?Energy is the ability to do work. It exists in many forms, such as kinetic energy (energy of motion), potential energy (stored energy), thermal energy (heat), chemical energy (energy stored in the bonds of molecules), electrical energy (energy carried by electrons), and nuclear energy (energy produced in the nucleus of an atom).
The reaction given is a reversible reaction and the given Kp value is at 25°C. Therefore, we can use the equation ΔG°rxn = -RT ln Kp to calculate the standard Gibbs free energy change of the reaction.
We know that R = 8.314 J/mol K and T = 298 K (25°C)
Therefore, ΔG°rxn = - 8.314 J/mol K x 298 K x ln (2.26 x 10⁴)
ΔG°rxn = -18,262 J/mol
Therefore, the standard Gibbs free energy change of the reaction at 25°C is -18,262 J/mol.
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VSEPR model,central atom and Br (Bromine).
Answers
Explanation:
The Lewis electron-pair approach can be used to predict the number and types of bonds between the
atoms
in a substance, and it indicates which
atoms
have lone pairs of electrons. This approach gives no information about the actual arrangement of
atoms
in space, however. We continue our discussion of structure and bonding by introducing the valence-shell electron-pair repulsion (VSEPR) model (pronounced “vesper”), which can be used to predict the shapes of many molecules and
polyatomic ions
. Keep in mind, however, that the VSEPR model, like any model, is a limited representation of reality; the model provides no information about bond lengths or the presence of multiple bonds.
A stainless steel knife has a volume of 1.2 cubic centimeters and a mass of 9.0 grams.
Calculate its density.
Write your answer to the tenths place.
Answers
Answer:
7.5
Explanation:
density = mass / volume
9÷1.2 = 7.5
if there are more products than reactants, does that mean there is an increase in the forward or backward reaction? And if there are more reactants that products, is there an increase in the forward or backward reaction?
Answers
Answer:
If there are more products than reactants, that means the reaction has shifted towards the left, which is the backward direction. If there are more reactants than products, that means the reaction has shifted towards the right, which is the forward direction.
Which is not a compound
A.Sugar
B.Water
C.Gold
D.Silicon dioxide
Answers
Answer:
C
Explanation:
thats my guess but im not completely sure
copper reacts with oxygen to form two oxides x and y. on analysis 1.535g of x yielded 1.365g of copper and 1.450g of y yielded 1.160g of copper (I) determine the chemical formula for x and y (ii) calculate the mass cooper which can react with 0.5g of oxygen to yield x and y (iii) which of the laws of chemical combination is illustrated by the result above?
Answers
The chemical formula for x and y is Cu₂O and CuO. The mass cooper which can react with 0.5g of oxygen to yield x and y is 2.745 g.
What is chemical formula ?A chemical formula is a phrase that lists the constituent parts of a compound together with their relative quantities. No subscript is used if there is just one atom of a certain kind. A subscript is added to the symbol of an atom if it contains two or more of a certain type of atom.
1. 1.535 g of X → 1.365 g of Copper
1.535 – 1.365 = 0.170g of Oxygen
Atomic weight of Cu = 63.5,
Atomic weight of Oxygen = 16
For Cu 1.365 g / 63.5 = 0.02 mol
For Oxygen 0.170 g / 16 = 0.01 mol
X = Cu₂O
1.450 g of Y → 1.160 g of Cu
1.450 – 1.160 = 0.290 g of Oxygen
For Cu = 1.160 g / 63.5 = 0.018 mol
For Oxygen = 0.290 g / 16 = 0.018 mol
Y = CuO
2. The total mass of Oxygen = 0,170 g + 0,290 g
= 0.460 g
Total mass of Cu = 1.160 g + 1. 365 g
= 2.525 g
0.460 g of Oxygen → 2.525 g of Cu
0.500 g of Oxygen → (2.525 x 0.5) / 0.460
= 2.745 g of Cu
Thus, The law of multiple proportions was formulated by John Dalton in 1804.
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Glucose, C6H12O6, is used to prepare intravenous feeding solutions. What volume of 5.0 % W/V glucose solution can be prepared using 125 g of glucose? Show your working.
Please if the answer is correct, ill give brainliest
Answers
250 L of 5.0% w/v glucose solution can be prepared using 125 g of glucose.
We use the below formula to solve our problem,w/v = [ mass of solute (g) / volume of solution (mL) ] × 100
Substitute the values from our problem,5.0 % w/v = [ 125 g / volume of solution (mL) ] × 100
Rearranging the formula, we havevolume of solution (mL) = [ 125 g / 5.0 % w/v ] x 100
Substitute further for w/v,volume of solution (mL) = [ 125 g / (5.0 / 100) ] x 100
Simplify the expression,volume of solution (mL) = [ 125 g / 0.05 ] x 100
Hence, the volume of solution (mL) = 250,000 mL or 250 LWhich of the following statements explain how creativity leads to new investigations? Check all of the boxes that apply.
Creativity lets scientists use their imagination to invent results.
Creativity leads scientists to design new methods to test their hypotheses.
Creativity allows scientists to investigate untestable hypotheses.
Creativity permits scientists to think of new questions to investigate.
Answers
Answer:
Creativity leads scientists to design new methods to test their hypotheses.
Creativity permits scientists to think of new questions to investigate.
Explanation:
A scientist must be very creative and must be a critical thinker.
Creativity is the ability of someone to use imaginations to solve a problem.
It is the art of being inventive. To the scientific world, creativity is very essential. It helps scientists to design new methods to validate their hypothesis. It also helps to bring up new questions that might be investigated.Answer:
B and D
Explanation:
Determine the energy released per kilogram of fuel used.
Given MeV per reaction, calculate energy in joules per kilogram of reactants.
Consider 1 mole of tritium plus 1 mole of deuterium to be a mole of “reactions” (total molar mass = 5 grams).
Answers
1. Calculate the energy released per reaction using Einstein's famous equation E = mc^2, where E is the energy released, m is the mass defect of the reactants, and c is the speed of light. The mass defect is the difference between the mass of the reactants and the mass of the products.
2. Convert the energy released per reaction from MeV (mega-electron volts) to joules using the conversion factor 1 MeV = 1.602 × 10^-13 joules.
3. Calculate the number of reactions per kilogram of reactants. Since 1 mole of tritium plus 1 mole of deuterium is a mole of "reactions," and the total molar mass of the reactants is 5 grams, we can calculate the number of moles of reactants per kilogram.
4. Multiply the energy released per reaction by the number of reactions per kilogram of reactants to get the energy released per kilogram of fuel used.
Here's the formula:
Energy released per kilogram of fuel used = (Energy released per reaction x Conversion factor x Reactions per kilogram of reactants) / 1000
What are the possible values of 1 and m for
n=4 ?
Answers
Answer:
If n = 4, then the possible values of 1 and m depend on the equation or expression being used. Without more information, it is impossible to determine what the possible values of 1 and m might be. Can you please provide more context or information about the problem you are trying to solve?
Draw the structure for the organic radical species produced by reaction of the compound with a chlorine atom. Assume reaction occurs at the weakest C-H bond.
Answers
Answer:
See explanation
Explanation:
The reaction of chlorine with the pictured compound will occur via free radical mechanism. The stability of the free radical formed will depend on its structure.
The order of stability of free radicals is methyl < primary < secondary < tertiary. Hence a tertiary carbon free radical is the most stable.
Looking at the compound, the radical will form at the position shown in the image attached since it will lead to a secondary free radical which is more stable.
The structure that should be drawn is shown below.
The reaction of chlorine:It should be within the pictured compound that will arise via a free radical mechanism. The stability should be based on the structure. The stability of the order of free radicals should be methyl < primary < secondary < tertiary. Thus, a tertiary carbon free radical should be most stable.
Here look at the compound, the radical should form at the position that should be shown in the image that resulted in the secondary free radical i.e. more stable.
The dissolution of ammonium nitrate, EON'HN is represented by the equation + (be)-EON NH4N03 (s) V Cbe)4HN One common use of this process S in chemical "ice packs" for first aid for injuries. Water is mixed with solid ammonium nitrate, NH4NO3. when the inside pouch of the "ice pack "iS broken. This results in the "ice ed getting cold enough cool injured muscles or joints. Using this information, please complete the reaction pathway diagram shown below. Label the products and AH.
Answers
This shows that the process is exothermic and that heat energy is released.
The dissolution of ammonium nitrate, \(NH_4NO_3\), can be represented by the following equation:
\(NH_4NO_3 (s) \rightarrow NH_4^{+}(aq) + NO_3^{-} (aq)\)
The dissolution of ammonium nitrate in water results in the formation of its constituent ions, ammonium (\(NH_4^+\)) and nitrate (\(NO_3^{-}\)). This process is exothermic, meaning that it releases energy in the form of heat. This process is used in chemical “ice packs” for first aid as the release of energy cools the surrounding area.
The reaction pathway diagram for this process is shown below. The reactant is ammonium nitrate (\(NH4NO_3\)) and the products are ammonium ion (\(NH_4^+\)) and nitrate ion (\(NO_3^{-}\)). The ΔH (enthalpy) of the reaction is represented by the downward-pointing arrow. This indicates that the reaction is exothermic, releasing energy in the form of heat.
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complete question:The dissolution of ammonium nitrate, NH4NO3, is represented by the equation
NH4NO3 (s) → NH4+(aq) + NO3 – (aq)
One common use of this process is in chemical “ice packs” for first aid for injuries. Water is mixed with solid ammonium nitrate, NH4NO3, when the inside pouch of the “ice pack “is broken. This results in the “ice pack” getting cold enough to cool injured muscles or joints. Using this information, please complete the reaction pathway diagram shown below. Label the products and ΔH.
Magnesium has three stable isotopes. The most commonly occurring isotope, Mg24,
has an isotopic mass of 23.985 u and makes up 78.99% of naturally occurring magnesium atoms. The isotope Mg25 makes up 10.00% of magnesium atoms and has an isotopic mass of 24.986 u. The isotope Mg26 makes up 11.01%
of magnesium atoms and has an isotopic mass of 25.983 u .
Using the isotopic composition provided, calculate the average atomic mass of magnesium.
average atomic mass:
Answers
The average atomic mass of magnesium is 24.305 amu.
The mass of a single atom is too small to be measured directly, but chemists and physicists use the atomic mass unit (amu) to describe the mass of an atom.
The atomic mass unit is defined as 1/12th of the mass of a carbon-12 atom. Magnesium (Mg) has three isotopes: Mg-24, Mg-25, and Mg-26, with masses of 23.985 amu, 24.986 amu, and 25.983 amu, respectively.
These isotopes make up 78.99%, 10.00%, and 11.01%, respectively, of all naturally occurring Mg atoms.
The atomic mass of Mg can be calculated using the weighted average of the three isotopes as follows:Average atomic mass = (78.99/100 x 23.985 amu) + (10.00/100 x 24.986 amu) + (11.01/100 x 25.983 amu)Average atomic mass = 23.940 amu + 2.499 amu + 2.864 amuAverage atomic mass = 29.303 amu.
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do materials like bubble wrap or cotton balls reduce the amount of peak force in a collision
THIS IS JUS ENVIRONMENTAL SCIENCE, THERE WAS NO OPTION SO I JUS PUT CHEM
Answers
Answer:
yes
Explanation:
but not much
Answer:
Yes they do in a less rate
How will the volume of a gas be affected if the pressure is tripled, but the temperature remains the same?
Answers
Answer:
Volume of the gass will decrease by three times of the original volume
Explanation:
Volume is inversly propotional to the pressure applied on it.
Answer:
it is decreased to one third of its original volume
Explanation:
Which substances in the list give me some of the reactants and products in the same condition reaction?
Answers
Answer:
1. CuO, 2. O2, and 3. Cu2O.
Explanation:
You can identify that we can state a synthesis reaction between Cu2O and O2 to form CuO:
\(2Cu_2O+O_2\rightarrow4CuO.\)The reactants are Cu2O and O2, and the product is CuO.
The answer would be 1. CuO, 2. O2, and 3. Cu2O.
please select all plausible lewis dot structures which are theoretically possible. note: this question has multiple correct answers.
Answers
A Lewis dot structure is a representation of the valence electrons of an atom or molecule.
The dots represent the electrons in the outermost shell, and it is possible to draw multiple Lewis dot structures for a molecule if there are different arrangements of valence electrons that are theoretically possible.
For example, for the molecule BF3, the following Lewis dot structures are possible:
(i)
F : B : F
: ::
. . . .
(ii)
F : B :: F
: :
. . . .
(iii)
F : B : : F
: .
. . . .
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After being ignited in a Bunsen burner flame, a piece of magnesium ribbon burns brightly, giving off heat and light. In this situation, the Bunsen burner flame providesA)ionization energyB)activation energyC)heat of reactionD)heat of vaporization
Answers
The reaction that involves the combustion of Magnesium will not start unless some amount of energy is added to it, therefore we need the Bunsen burner flame to be the source of the activation energy for the reaction properly occur, since the reaction would not occur in a spontaneous way. Therefore answer letter B
. Explain with examples following characteristics of chemical reactions:
a. Change of colour b. Evolution of gas c. Change of smell d. Change of state
Answers
Answer:
See explanation.
Explanation:
Hello,
a. In this case, the change of color is evident for instance when copper reacts with nitric acid to form hydrogen and copper (II) nitrate since copper orange-like and nitric acid is colorless, but copper (II) nitrate is green (dry) or blue (hydrated).
b. In this case, when we make react hydrochloric acid and magnesium, we notice a gas giving off while the magnesium chloride remains aqueous, due to the fact that magnesium displaces hydrogen which is given off as a gas.
c. In this case, we can consider an egg since when it is edible it has a tasty smell but when it decomposes to rotten egg, hydrogen sulfide is given off due to the action of specific bacteria, causing a change in smell to a quite stinky one.
d. In this case, a reaction by which a change of state is exhibited is for instance when aqueous lead (II) nitrate reacts with aqueous potassium iodide to yield potassium nitrate which remains aqueous whereas the lead (II) iodide precipitates out as a solid due to its tiny solubility as a yellow solid.
Best regards.
I want to know how to solve this question by step by step.
Question: What is the pH value of 500ml of an aqueous solution of 0.005 mol HCl ?
Answers
The pH value of 500 mL of an aqueous solution of 0.005 mole HCl is 2
How do I determine the pH of the solution?We'll begin our calculations by obtaining the molarity of the solution. Details below:
Volume of solution = 500 mL = 500 / 1000 = 0.50 LMole of HCl = 0.005 moleMolarity = ?Molarity = mole / volume
Molarity = 0.005 / 0.50
Molarity = 0.01 M
Next, we shall obtain the concentration of the hydrogen ion, H⁺ in the solution. Details below:
HCl(aq) <=> H⁺(aq) + Cl¯(aq)
From the balanced equation above,
1 mole of HCl contains 1 mole of H⁺
Therefore,
0.01 M HCl will also contain 0.01 M H⁺
Thus, the concentration of the hydrogen ion, H⁺ in the solution is 0.01 M
Finally, we shall determine the pH of the solution. Details below:
Concentration of hydrogen ion [H⁺] = 0.01 MpH of solution =?pH = -Log H⁺
pH = -Log 0.01
pH = 2
Thus, we can conclude that the pH of the solution is 2
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Complete the balanced molecular chemical equation for the reaction below. If no reaction occurs, write NR after the reaction arrow. Pb ( N O ₃ ) ₂ (aq) + K I (aq) → ☐⁴⁻ ☐³⁻ ☐²⁻ ☐⁻ ☐⁺ ☐²⁺ ☐³⁺ ☐⁴⁺ 1 2 3 4 5 6 7 8 9 0 ☐₁ ☐₂ ☐₃ ☐₄ ☐₅ ☐₆ ☐₇ ☐₈ ☐₉ ☐₀ + ( ) → ⇌ (s) (l) (g) (aq) NR Pb I N O K Reset
Answers
Answer: \(Pb(NO_3)_2(aq)+2KI(aq)\rightarrow PbI_2(s)+2KNO_3(aq)\)
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
The double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.
The balanced molecular equation is:
\(Pb(NO_3)_2(aq)+2KI(aq)\rightarrow PbI_2(s)+2KNO_3(aq)\)