3000.0 J of thermal energy is added to a 250.0 g block of metal and thetemperature is increased by 37.5 °C. Based on the values in the followingtable of specific heats, which is the most likely identity of this metal
Answers
ANSWER
\(\begin{gathered} \text{ The specific heat of the metal block is 0.32 J/g}\degree C \\ \text{ The metal is Germanium} \end{gathered}\)EXPLANATION
Given information
The thermal energy added is 3000 J
The mass of the metal block is 250.0 grams
The temperature change is 37.5 degrees Celcius
Firstly, we need to find the specific heat capacity of the metal block
To find the specific heat capacity of the metal block, follow the steps below
Step 1: Write the formula for calculating the heat of a substance
\(\begin{gathered} \text{ q = mc}\Delta\theta \\ \text{ Where} \\ q\text{ = heat energy} \\ m\text{ = mass} \\ c\text{ = specific heat capacity} \\ \Delta\theta=\text{ increase in temperature} \end{gathered}\)Step 2: Substitute the given data into the formula in step 1 to find c
\(\begin{gathered} q\text{ = mc}\Delta\theta \\ \text{ make c the subject of the formula} \\ \text{ c = }\frac{q}{m\Delta\theta} \\ \text{ c = }\frac{3000}{250\text{ }\times37.5} \\ c\text{ = }\frac{3000}{9375} \\ c\text{ = 0.32 J/g}\degree C \end{gathered}\)Hence, the specific heat capacity of the metal block is 0.32 J/g degrees Celcius
According to the table of specific heats, the metal that has the above specific heats is Germanium
Related Questions
Which one of the following compounds behaves as an acid when dissolved in water?
A) CH4
B) KOH
C) HBr
D) BaO
Answers
When a substance is dissolved in water, it exhibits acidic behavior.C) HBr
What does HBr serve?There are three different ways to define purpose: competency (the function of our product provides); culture (the intention with which we conduct our business); and cause (the societal good we strive for).
HBr is peer reviewed, right?Harvard Business Journal is not a journal.HBR is not an academic publication.Peer-reviewed academic works undergo a quality assurance procedure.The research & conclusions offered in an article are evaluated by professionals and academics within the same subject.
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oxygen is a product of the electron transport chain.- true or false?
Answers
CO2 play a role in earlier processes of cellular respiration.ture
On Greg's last visit to his doctor, he complained of feeling tired. Sandra, the registered nurse, withdrew 6.5 mL of blood, which was sent to the lab and tested for iron. The normal range for serum iron in men is 80 to 160 mcg/dL. Greg's iron test showed a blood serum iron level of 39 mcg/dL, How many micrograms of iron were in the 6.5-mL sample of Greg's blood?
Answers
Answer:
2.5 mcg of iron
Explanation:
Density is given as;
D= m/v
Where;
m= mass
v= volume
mass= ?
volume= 6.5 ml or 0.065 dl
d= 39 mcg/dL
m= density × volume
m= 39 mcg/dL × 0.065 dl
m= 2.5 mcg of iron
A .952 L container of gas is exerting a pressure of 108 kPa while at a temperature of 48 C. Calculate the pressure of this same amount of gas in a 1.236 L container at a temperature of 64 C.
Show Your Work
Answers
Answer:
87.33 kPa (2 d.p.)
Explanation:
To solve this problem, use the combined gas law.
Combined Gas Law\(\boxed{\sf \dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}}\)
where:
P₁ is the initial pressure.V₁ is the initial volume.T₁ is the initial temperature (in kelvin).P₂ is the final pressure.V₂ is the final volume.T₂ is the final temperature (in kelvin).As we want to find the final pressure, rearrange the formula to isolate P₂:
\(\sf P_2=\dfrac{P_1V_1T_2}{T_1V_2}\)
As the temperatures have been given in Celsius, we need to first convert the temperatures from Celsius to kelvin by adding 273.15:
\(\implies \sf T_1=48+273.15=321.15\;K\)
\(\implies \sf T_2=64+273.15=337.15\;K\)
The given values are:
P₁ = 108 kPaV₁ = 0.952 LT₁ = 321.15 KV₂ = 1.236 LT₂ = 337.15 KSubstitute the values into the formula and solve for P₂:
\(\implies \sf \sf P_2=\dfrac{108 \cdot 0.952 \cdot 337.15}{321.15 \cdot 1.236}\)
\(\implies \sf \sf P_2=\dfrac{34664.414}{396.9414}\)
\(\implies \sf P_2=87.3287946...\)
\(\implies \sf P_2=87.33\;kPa\;(2\;d.p.)\)
Therefore, the final pressure of the gas is 87.33 kPa (2 d.p.).
T₁ = 300 K
A. 100 K
C. 325 K
T₁ = 100 K
What is a possible
temperature of the
system after the
divider has been
removed?
B. 75 K
D. 185 K
Answers
Answer:
185K
Explanation:
After the molecules mix, they reach a thermal equilibrium.....
Teq =(T1 + T2)/2 =(100+300)/2 =200K
since 185K is closer to 200K than the other options... Therefore the possible equilibrium temperature is 185K
We are given an initial temperature of the system, T1, as:
T1 = 300 K
After the divider is removed, the system will reach thermal equilibrium. According to the second law of thermodynamics, heat will flow from the hotter object to the colder object until the temperatures equalize.
This means the final temperature of the system after the divider is removed will be somewhere in between the initial temperatures of the two parts.
So considering the four answer choices:
A) 100 K - This is too low, the final temperature will be higher than 100K
B) 75 K - Also too low
C) 325 K - This is the initial temperature of one part, so the final temperature cannot be 325K
D) 185 K - This is a plausible final temperature in between 100K and 300K
Therefore, the answer is likely to be D) 185 K
In short, the key points are:
Heat will flow from the hotter to colder object until temperatures equalize
The final temperature will be somewhere in between the initial temperatures of the two parts
Answer choices A,B and C are too low or the same as one of the initial temperatures
Only D) 185K is a plausible intermediate temperature between 100K and 300K
Which statement correctly describes compounds? Compounds cannot be broken down into simpler substances by chemical means. Each compound is composed of one type of molecule. Compounds can be broken down into simpler substances by physical means. Each compound is composed of one type of atom.
Answers
Each compound have consisted of one type of molecule. Thus, option B is correct.
Compounds have been the chemical moiety that has been consisted of the number of molecules.
The molecules have consisted of varying atoms in the fixed proportion formed by the intermolecular interactions. The identical molecules club together with the intramolecular interactions and result in the compound.
Examples of compounds have been sugar, water, carbon dioxide, table salt, etc.
Thus, each compound have consisted of one type of molecule. Thus, option B is correct.
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Describe the correct electron dot diagrams for the first ten elements of the periodic table.
Answers
Answer:
Describe the correct electron dot diagrams for the first ten elements of the periodic table. H and Li will each have one dot, He and Be will each have two dots, B will have three, C will have four, N will have five, O will have six, F will have seven, and Ne will have eight. Sulfur has 16 electrons in its atoms.
which material allowed house to have highest average internal Temperature? explain your answer
A.Fiberglass
B.Brick
C.Soil
Answers
Brick retains the most heat out of all the choices.
4) What type of reaction is the following?
exothermic
endothermic
not enough information given
Answers
Answer:
Endothermic
Explanation:
Notice that heat is written as part of the reactants. Therefore, heat is necessary for the reaction to proceed.
In other words, the reaction is endothermic.
Conversely, if the heat is written as part of the products, heat is released as the reaction proceeds and hence the reaction is exothermic.
An equation that represents the relationship between b and e
Answers
Answer:
Explanation:
Understand that the graph of an equation in two variables is the set of all its solutions plotted in the coordinate plane, often forming a curve (which could be a line).
A proportional equation y=kx where k is the so-called "constant of proportionality".
What happens to the tape at the closer markers compared to the markers that are further away?
Answers
explain why it is the freezing point depression of a solvent does depend on the concentration of the solute.
Answers
The reason why the freezing point depression of a solvent depends on the concentration, it is because the solute occupies space between the solvent molecules.
The freezing point depression of a solvent depends on the concentration of the soluteThe freezing point depression of a solvent does depend on the concentration of the solute because the solute occupies space between the solvent molecules, thus reducing the number of molecules that can interact.
When a solute is dissolved in a solvent, it takes up space between the solvent molecules. This reduces the number of molecules that can interact, and thus lowers the freezing point of the solvent. The more concentrated the solution, the greater the effect on the freezing point.
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A single piece of salt has a mass 0.583 g and was placed in a graduated cylinder which contained 4.02 mL oil, the volume increased to 4.22 mL. What is the density of the salt?
Answers
The density of the salt is 2915 kg/dm³.
To determine the density of the salt, we need to calculate the volume of the salt and then divide the mass of the salt by this volume. The volume of the salt can be found by subtracting the initial volume of oil in the graduated cylinder from the final volume after the salt was added. In this case, the initial volume was 4.02 mL and the final volume was 4.22 mL, so the volume of the salt is 0.20 mL.
To convert this volume to dm³, we multiply by the conversion factor 10^-3, resulting in 0.20 x 10^-3 dm³. Finally, we divide the mass of the salt (0.583 g) by the volume (0.20 x 10^-3 dm³) to find the density, which is 2915 kg/dm³.
Therefore, the density of the salt is determined to be 2915 kg/dm³.
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7. What measures are applicable in the context of Nepal to push energy crisis further. Describe any three points clearly.
Answers
Answer:
which energy?........
Explanation:
..........................
........
....
An atom forms an ion with a -2 charge. It is:
A:A metal in group 2
B:A metal in group 6
C:A non-metal in group 2
D:A non-metal in group 6
Answers
a gas mixture contains 78% nitrogen and 22% oxygen. if the total pressure is 1.12 atm, what is the partial pressure of nitrogen?
Answers
The partial pressure of nitrogen in the gas mixture is 0.875 atm.
We can use Dalton's Law of partial pressures to find the partial pressure of nitrogen. Here's a step-by-step explanation:
1. Calculate the fraction of nitrogen in the gas mixture:
Fraction of nitrogen = 78% (nitrogen) / 100% (total)
Fraction of nitrogen = 0.78
2. Multiply the fraction of nitrogen by the total pressure to find the partial pressure of nitrogen:
Partial pressure of nitrogen = Fraction of nitrogen × Total pressure
Partial pressure of nitrogen = 0.78 × 1.12 atm
3. Calculate the partial pressure of nitrogen:
Partial pressure of nitrogen ≈ 0.87 atm
So, the partial pressure of nitrogen in the gas mixture is approximately 0.87 atm (rounded to two significant figures).
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complete question:
gas mixture contains 78% nitrogen and 22% oxygen. if the total pressure is 1.12 atm, what is the partial pressure of nitrogen?Express your answers in atmospheres to two significant figures.
From each of the following ion concentrations in a solution, predict whether a precipitate will form in the solution. (Hint: Calculate Q and compare Q to Ksp)
a) [Ba2+] = 0.020 M, [F-] = 0.015 M Ksp= 1.0x10-6
BaF2(s) Ba2+(aq) + 2F-(aq)
b) [Pb2+] = 0.035 M, [Cl-] = 0.15M Ksp= 1.6x10-5
PbCl2(s) Pb2+(aq) + 2Cl-(aq)
Answers
If the ionic constant Q is greater than Ksp the solution forms precipitate if it is lower than the solubility constant Ksp then there will be no precipitate. Both of the given solutions forms precipitate.
What is ionic constant?The ionic constant Q of a solution is the product of molar concentrations of reactants. Solubility constant Ksp is the product of solubilities of the reactant ions when the reaction is in equilibrium.
For the first solution Q = 0.020 M × 0.015M = 0.003.
Ksp = 0.000001. Hence, Q is greater than Ksp which means the solution forms precipitate of BaF₂.
For the second solution Q = 0.035 M × 0.15 M =0.0025.
This is greater than Ksp = 1.6 × 10⁻⁵. Hence, this solution forms a precipitate of PbCl₂.
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Calculate the mass of hydrogen produced when 72 g of magnesium
reacts with sulfuric acid.
Answers
Since this is a single replacement reaction, the equation for the reaction is:
\(\text{Mg}+\text{H}_{2}\text{SO}_{4} \longrightarrow \text{MgSO}_{4}+\text{H}_{2}\)
From this, we know that for every mole of magnesium consumed, 1 mole of hydrogen is produced.
The atomic mass of magnesium is 24.305 g/mol, so 72 grams of magnesium is 72/24.305 = 2.9623534252211 moles.
This means we need to find the mass of 2.9623534252211 moles of hydrogen.
Hydrogen has an atomic mass of 1.00794 g/mol, so doubling this to get the formula mass of of \(\text{H}_{2}\), we get 2.01588 g/mol, which his a mass of:
(2.01588)(2.9623534252211). which is about 5.97 g
Part E
Study the trend of the graph from part C. What would the reaction time be (in seconds) if the water were cooled to
5°C?
Answers
According to the information of the graph we can infer that if the water were cooled to 5°C the reaction time would be close to 30 seconds.
What would the reaction time be if the water were cooled to 5°C?To establish what would the reaction time be if the water were cooled to 5°C we have to analyze the information of the graph specially the trend. In this case, we have to take into account where are located the point that relate time and temperature.
In this case, the trend is more time with less temperature. So if the water were colled to 5°C, the time would be close to 30 seconds.
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you are about to compound a sterile order for chlorothiazide. you calculate the amount you'll need to withdraw is 20 ml. which syringe size should you pick? select one: 10 ml 15 ml 20 ml 30 ml
Answers
Based on the information provided, you should choose a 20 ml syringe for compounding the sterile order for chlorothiazide, as it will allow you to withdraw the exact calculated amount needed.
You should pick a 30 ml syringe to withdraw 20 ml of chlorothiazide. This will allow you to withdraw the medication with enough room in the syringe to prevent any spills or contamination. It is always important to choose a syringe size that is larger than the volume you need to withdraw to ensure accuracy and safety in compounding sterile orders.
Based on the information provided, you should choose a 20 ml syringe for compounding the sterile order for chlorothiazide, as it will allow you to withdraw the exact calculated amount needed.
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The diagram below shows the eye, with several features labeled.
Which part of the eye is responsible for focusing an image onto the retina?
A
B
C
D
Answers
For your question about diagram it is definitely A
Answer:
A
Explanation:
the threshold frequency for gold is 1.20x 1015 hz. if the total energy emitted by a sample of gold is 12.2 kj, calculate the number of atoms present in the sample? (assume each atom emits one photon)
Answers
Answer: Number of atoms: 1.82 x 10^21
Explanation:
To calculate the number of atoms present in the sample of gold, we can use the equation:
E = Nhf
Where:
E is the total energy emitted by the sample,
N is the number of atoms,
h is the Planck's constant (approximately 6.626 x 10^-34 J·s),
f is the frequency of each photon.
We are given the total energy emitted by the sample as 12.2 kJ, which we need to convert to joules:
12.2 kJ = 12.2 x 10^3 J
The frequency of each photon is related to the threshold frequency by the equation:
f = threshold frequency
Substituting the given values:
f = 1.20 x 10^15 Hz
Now we can rearrange the equation E = Nhf to solve for N:
N = E / (hf)
Substituting the values:
N = (12.2 x 10^3 J) / ((6.626 x 10^-34 J·s) * (1.20 x 10^15 Hz))
Performing the calculation:
N ≈ 1.82 x 10^21
Therefore, the number of atoms present in the sample is approximately 1.82 x 10^21.
How many moles of water (H2O) are needed to react completely with 7. 3 moles of iron (Fe)? *
2 points
5. 5 mol water
2. 4 mol water
4. 0 mol water
9. 7 mol water
Answers
D. 9. 7 mol of water are needed to react completely with 7. 3 moles of iron (Fe)
To determine the number of moles of water needed to react completely with 7.3 moles of iron (Fe), we need to balance the chemical equation for the reaction between iron and water. The balanced equation is:
3 Fe + 4 \(H_{2}O\) -> \(Fe_{3}O_{4}\) + 4 \(H_{2}\)
According to the balanced equation, 4 moles of water are required to react with 3 moles of iron. This means that the stoichiometric ratio between water and iron is 4:3.
Given that we have 7.3 moles of iron, we can use this ratio to calculate the amount of water needed. We set up the following proportion:
4 moles \(H_{2}O\) / 3 moles Fe = x moles \(H_{2}O\) / 7.3 moles Fe
Cross-multiplying and solving for x, we find:
x = (4 moles \(H_{2}O\) / 3 moles Fe) * 7.3 moles Fe
= 9.73 moles \(H_{2}O\)
Therefore, approximately 9.7 moles of water are needed to react completely with 7.3 moles of iron. The closest option provided is 9.7 mol water. Therefore, Option D is correct.
The question was incomplete. find the full content below:
How many moles of water (\(H_{2}O\)) are needed to react completely with 7. 3 moles of iron (Fe)? * 2 points
A. 5. 5 mol water
B. 2. 4 mol water
C. 4. 0 mol water
D. 9. 7 mol water
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[H+] for a solution is 1 x 10^-7 M. This solution is _____________.
A. acidic
B. basic
C. neutral
Answers
Answer:
the answer is C neutral
Explanation:
if the ph is lower then 7 its acidic
if its higher then 7 its basic
and a ph of 7 is neutral
The periodic table is arranged by various patterns. Is there a pattern with regard to oxidation number? In three to five sentences, explain your reasoning and provide specific examples.
Answers
The oxidation number of elements becomes increasingly higher from left to right. Elements have more than one stable oxidation state as we move from left to right in the periodic table.
The periodic table contains an arrangements of elements in groups and periods. All elements in a group have similar chemical reactions while elements in the same period have the same highest energy level.
As we move from left to right in the periodic table, we notice that higher oxidation numbers of elements begin to appear. Also, we begin to see elements having more than one oxidation numbers.
Most main group metals on the left hand side of the table have only one stable oxidation number. However, across the period, higher oxidation numbers begin to appear.
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Explain why the answer is correct and why the others aren’t.
Pleaseeee
Answers
Answer:
Buffalo and Watertown.
Explanation:
This is correct as the Interior lowlands are located ib the US. These are correct as the others are in the US but aren't located anywhere near the Interior Lowlands.
pls help me 13 min left if you go past and not help are not mine
Answers
Answer:
mushroom
mold
spore cases
hyphae
fungus
Water has a specific heat capacity of 4.184J/g Celsius. The experiment heated 200 grams of water from 30 Celsius to 100 Celsius. How much energy is absorbed by the water?
Answers
Taking into account the definition of sensible heat, the amount of energy absorbed by the water is 58,576 J.
Definition of sensible heatWhen heat added or removed from a substance causes a temperature change in it without affecting its molecular structure, it is called sensible heat.
The expression that allows to calculate heat exchanges is:
Q = c× m× ΔT
where:
Q is the heat exchanged by a body of mass m.c is the specific heat substance.ΔT is the temperature variation.Energy absorbed by the waterIn this case, you know:
Q= ?c= 4.184J/g Celsiusm= 200 gΔT= Tfinal - Tinitial= 100 C - 30 C= 70 CReplacing in the definition of sensible heat:
Q = 4.184J/g Celsius× 200 g× 70 C
Solving:
Q=58,576 J
Finally, 58,576 J is absorbed by the water.
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Which of these atoms (if any) are isotopes of the same element? Explain your reasoning.
2. Use the information given below to calculate the average atomic mass of element X.
ISOTOPE ABUNDANCE (%) MASS (u or g/mol)
302 X 12.64 302.04
304 X 18.23 304.12
306 X 69.13 305.03
Answers
Relative and average atomic mass both describe properties of an element related to its different isotopes. Out of these two Relative atomic mas is more accurate. The average atomic mass is 303g.
What is mass?Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.
Average atomic mass = (mass of first isotope× percent abundance of first isotope)+(mass of second isotope× percent abundance of second isotope)
Substituting the given values
Average atomic mass=( 302 × 12.64 %)+(304 × 18.23 %) + (306 × 69.13% )
Average atomic mass=303g
Therefore, the average atomic mass is 303g.
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Which of the following products is NOT generated via TCA cycle or electron transport chain? A) water. B) energy. C) ammonia. D) carbon dioxide. C) ammonia.
Answers
The correct answer is C) ammonia.
The products generated via the tricarboxylic acid (TCA) cycle and electron transport chain include water (A), energy (B) in the form of ATP, and carbon dioxide (D). These processes are part of cellular respiration, where organic molecules are broken down to produce energy.
However, ammonia (C) is not a direct product of the TCA cycle or electron transport chain. Ammonia can be generated through other metabolic pathways, such as amino acid metabolism or the breakdown of nitrogen-containing compounds, but it is not a primary product of the TCA cycle or electron transport chain.
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