Answer:
548.089 J
Explanation:
-The molar mass of copper is 63.546 grams.
-We obtained the mass of 0.762 moles of copper:
[tex]mass =moles\times molar\ mass\\\\\\=0.762\times 63.546\\\\=48.422\ g[/tex]
-We apply the specific heat formula to calculate the amount of heat released:
[tex]q=mC\bigtriangleup T\\\\\\=48.422\ g\times 0.385 \ J/g\textdegree C\times (81.6-52.2)\textdegree C\\\\\\=548.089 J[/tex]
Hence, the amount of heat released is 548.089 J
The heat released when 0.762 mol of copper cools from 81.6°C to 52.2°C can be calculated using the formula q = mcΔT where q is the heat transferred, m is the mass, c is the specific heat capacity and ΔT is the temperature change. The calculated heat released is approximately -548.07 Joules.
Explanation:To calculate the heat released when 0.762 mol of the copper cools from 81.6°C to 52.2°C, we need to first know the specific heat capacity of copper, which is 0.385 J/g°C.
Calculate the temperature change: ΔT = Tfinal - Tinitial = 52.2°C - 81.6°C = -29.4°C. The negative sign indicates a decrease in temperature or that heat is released. Convert the number of moles of copper to mass: mass = moles x molar mass = 0.762 mol x 63.5 g/mol = 48.4 g. Then, use the equation for heat transfer: q = mcΔT where m is the mass of the copper, c is the specific heat capacity of copper, and ΔT is the temperature change. Substituting the known values gives q = 48.4 g x 0.385 J/g°C x -29.4°C. Doing the math, q = -548.07 Joules. As q is negative, this indicates that heat is released.Learn more about Heat Transfer here:
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Boiling point non example
Answer:
any thing under 212 degrees Fahrenheit
Explanation:
the boiling point of water is 212 degrees Fahrenheit so any thing below this would be a non example.
The temperature of a sample of iron with a mass of 10.0g changed from 50.4 degrees C with the release of 114J. What is the specific heat of iron ?
Answer:
[tex]c = 449 \: j \: kg {}^{ - 1} \: k {}^{ - 1} [/tex]
2 Points
Which role do fish ladders serve?
O
A. They allow fish farmers to raise certain kinds of fish.
O
B. They help some kinds of fish migrate past dam barriers.
O
C. They improve the nutritional value of some kinds of fish.
O
D. They help certain kinds of fish stay physically fit.
Answer:
B. They help some kinds of fish migrate past dam barriers.
Explanation:
Description
A fish ladder, also known as a fishway, fish pass or fish steps, is a structure on or around artificial and natural barriers (such as dams and waterfalls) so as to enhance diadromous fishes' natural migration as well as movements of potamodromous species.
In Figure 9-2, are both kinds of atoms in balance, only nitrogen atoms in balance, only oxygen atoms
in balance, or neither kind of atom in balance?
Figure 9-2
A) The equation is balanced for both kinds of atoms
B) The equation is balanced for oxygen atoms only
C) The equation is balanced for nitrogen atoms only
D) The equation is balanced for either kind of atom
Answer:
C) The equation is balanced for nitrogen atoms only
Explanation:
nitrogen (black one) - 1 before and 1 after reaction
oxygen (white one) - 3 before and 2 after reaction
So,
C) The equation is balanced for nitrogen atoms only
how many sex chromosomes would be present in an individual with 80 chromosomes?
A)2
B)1
C)39
D)40
Answer:
D) 40
Explanation:
The number of sex chromosomes in an organism is half the number of chromosomes the individual has.
So if the individual has 80 chromosomes, they’ll have 80/2 =40 sex chromosomes.
Answer:
A)2
Explanation:
How many moles of H2SO4 are present in 0.500 L of a 0.150 M H2SO4 solution?
Answer: 0.075
Explanation:
(concentration in molarity)(volume in liter) = answer
0.15 mol/L *0.500L = 0.075 mol
The number of moles of H2SO4 in the given solution is 0.075 moles.
Explanation:The question is asking how many moles of H2SO4 are present in 0.500 L of a 0.150 M H2SO4 solution.
To answer this question, we can use the equation:
Moles of solute = concentration (M) x volume (L)
In this case, the concentration is 0.150 M and the volume is 0.500 L. Plugging these values into the equation, we get:
Moles of H2SO4 = 0.150 M x 0.500 L = 0.075 mol
Therefore, there are 0.075 moles of H2SO4 present in 0.500 L of the solution.
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How much energy in Joules is released by burning a cheese ball that raises the temperature of
74.2 g water from 24°C to 41°C? How many Calories is this?
Answer:
1. The heat energy in Joules is 5280.22J
2. The heat energy in calories is 1261.4 calories
Explanation:
Step 1:
Data obtained from the question.
The following data were obtained from the question:
Mass of water (M) = 74.2 g
Initial temperature (T1) = 24°C
Final temperature (T2) = 41°C
Change in temperature (ΔT) = T2 - T1 = 41 - 24 = 17°C
Heat energy (Q) =?
Recall:
Specific heat capacity of water = 4.186 J/g°C
Step 2:
Determination of the energy in Joules.
This is illustrated below:
Q = MCΔT
Q = 74.2 x 4.186 x 17
Q = 5280.22J
Step 3:
Conversion of the heat energy in Joules to calories. This is illustrated below:
4.186 J = 1 calorie
Therefore, 5280.22J = 5280.22/4.186 = 1261.4 calories
Sally adds 3.13 moles of argon to a 5.29 liter balloon that already contained 2.51 moles of argon. What is the volume of the balloon after the addition of the extra gas?
Answer:
6.60 L
Explanation:
3.13 mol * 5.29 L / 2.51 mol = 6.59669323 liters but sig figs so 6.60 L
The volume of the balloon after adding the extra argon gas is approximately 11.89 liters.
To determine the volume of the balloon after adding the extra argon gas, we can use the concept of the ideal gas law, which states:
PV = nRT
where:
- P is the pressure
- V is the volume
- n is the number of moles
- R is the ideal gas constant
- T is the temperature
Since the problem doesn't specify changes in pressure or temperature, we'll assume they remain constant. Therefore, the volume is directly proportional to the number of moles of gas ( [tex]V \propto n[/tex] ).
Initially, the balloon contains 2.51 moles of argon in 5.29 liters.
We can set up the proportional relationship:
[tex]\frac{V_1}{n_1} = \frac{V_2}{n_2}[/tex]
Given:
- V₁ = 5.29 liters
- n₁ = 2.51 moles
- n₂ = 2.51 + 3.13 = 5.64 moles
We need to find V₂ :
[tex]\frac{5.29 \, \text{L}}{2.51 \, \text{moles}} = \frac{V_2}{5.64 \, \text{moles}}[/tex]
Solving for V₂ :
[tex]V_2 = \frac{5.29 \, \text{L} \times 5.64 \, \text{moles}}{2.51 \, \text{moles}} \\\\V_2 = \frac{29.8356 \, \text{L} \cdot \text{moles}}{2.51 \, \text{moles}} \\\\V_2 \approx 11.89 \, \text{L}[/tex]
Therefore, the volume of the balloon after adding the extra argon gas is approximately 11.89 liters.
liters of a 2.40 M
M
KBr
K
B
r
solution to obtain 3.40 moles of KBr
Answer:
1.42 L
Explanation:
Step 1:
The following data were obtained from the question :
Molarity of KBr = 2.40 M
Mole of KBr = 3.40 moles
Volume of solution =?
Step 2:
Determination of the volume of the solution.
Molarity of solution is simply the mole of the solute per unit volume the of solution. It is given as :
Molarity = mole /Volume
Volume = mole /Molarity
Volume = 3.4/2.4
Volume = 1.42 L
Therefore, the volume of the solution is 1.42 L
Which of the following characteristics are true of enzymes? Check all that apply.
The structure of an enzyme can change if conditions change.
A single enzyme can normally catalyze a wide variety of reactions under many conditions
Enzymes are found only in nonliving systems.
2 Enzymes allow living things to regulate body conditions through feedback mechanisms.
Enzymes bind to specific substrates in specific ways.
Enzymes increase the rate of reaction.
When shown in energy-reaction diagrams, enzymes represent the higher activation energy.
Answer:
The structure
Enzymes allow
Enzymes blind
Emzymes increase
Explanation:
Enzymes are biological catalysts that are essential to the functioning of living things. They are able to adapt their structure in response to various circumstances, which allows them to perform catalytic tasks with flexibility.
One enzyme can catalyse a wide variety of processes, which adds to the metabolic flexibility. Through feedback mechanisms, enzymes give organisms the ability to control physiological circumstances and maintain homeostasis.
Enzymes increase reaction speeds by lowering activation energy barriers by precisely binding to particular substrates. Cells can function well thanks to this catalytic process.
Thus, on the contrary, enzymes reduce the activation energy, speeding up processes. Enzymes are dynamic organisms at the centre of biological processes that expertly direct molecular changes.
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After applying the keratin treatment to Kimi's hair and blowdrying it, Chelsea should set her flat iron to what temperature
The statement for flat iron temperature is "450°F (i.e., 230°C)."
What is temperature?Temperature is the measurement of a body's level of hotness or coolness.
The average kinetic energy of the system is measured by temperature. The kinetic energy of particles in a matter raises as they move faster, which boosts the temperature of the system. When two bodies of differing temperatures come into touch, heat is the energy exchanged between them.
Fine hair strands should be kept at 350–375 degrees Fahrenheit , whereas coarse or thick hair should be at 400–450 degrees Fahrenheit.
Wavy hair can become flat due to heat damage, losing the texture. For some context, 450 degrees Fahrenheit is the temperature at which semi-permanent keratin straightening procedures are performed.
Chelsea should set her flat iron to 450 degrees Fahrenheit, that is 230 degrees Celsius after applying the keratin treatment on Kimi's hair and blow drying it.
Hence, the correct answer is 450°F (i.e., 230°C).
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How many protons and neutrons does the isotope Ab-298 have? 118 protons and 200 neutrons 200 protons and 178 neutrons 119 protons and 179 neutrons 119 protons and 180 neutrons
Answer:
119 protons and 179 neutrons
Explanation:
Given an element of the form AB-298, we know that 298 is the mass, which means it's the sum of the number of protons and number of neutrons.
Look at the answer choices and find the one whose numbers add up to 298. Only C (119 protons and 179 neutrons) is correct because 119 + 179 = 298.
Hope this helps!
A propane stove burned 470 grams propane and produced 625 grams of water (this is the actual yield) C3H8 +5O2=3CO2+4H20. What was the percent yield of water for the stove?
I would really appreciate the help. I don't understand how to begin.
Answer:
81.3%
Explanation:
Step 1:
The balanced equation for the reaction:
This is shown below:
C3H8 + 5O2 —> 3CO2 + 4H2O
Step 2:
Data obtained from the question. This includes:
Mass of propane (C3H8) = 470 g
Actual yield of water (H2O) = 625 g
Percentage yield of water (H2O) =?
Step 3:
Determination of the mass of propane (C3H8) burned and the mass of water (H2O) produce from the balanced equation. This is illustrated below:
C3H8 + 5O2 —> 3CO2 + 4H2O
Molar Mass of C3H8 = (3x12) + (8x1) = 36 + 8 = 44g/mol
Molar Mass of H2O = (2x1) + 16 = 2 + 16 = 18g/mol
Mass of H2O from the balanced equation = 4 x 18 = 72g
From the balanced equation above,
44g of C3H8 was burned and 72g of H2O was produced.
Step 4:
Determination of the theoretical yield of H2O. This is illustrated below:
From the balanced equation above,
44g of C3H8 produced 72g of H2O.
Therefore, 470g of C3H8 will produce = (470x72)/44 = 769.09g of H2O.
Therefore, the theoretical yield of H2O is 769.09g
Step 5:
Determination of the percentage yield of water (H2O). This is illustrated below:
Actual yield of water (H2O) = 625g
theoretical yield of H2O = 769.09g
Percentage yield of water (H2O) =?
Percentage yield = Actual yield/Theoretical yield x100
Percentage yield = 625/769.09 x100
Percentage yield = 81.3%
Therefore, the percentage yield of water (H2O) is 81.3%
Final answer:
The percent yield of water produced during the combustion of propane is calculated as the actual yield divided by the theoretical yield, multiplied by 100. Using stoichiometry, it is determined to be 81.35%.
Explanation:
The question is about the percent yield of water produced during the combustion of propane. The formula to calculate percent yield is actual yield divided by theoretical yield, multiplied by 100. First, we must establish the theoretical yield of water in moles. Propane has a molar mass of approximately 44.1 g/mol, so 470 grams of propane is equivalent to approximately 10.657 moles (470g / 44.1g/mol). The balanced equation states there are 4 moles of water produced per mole of propane, which would yield 42.628 moles of water (10.657 moles C3H8 x 4 moles H2O). Since the molar mass of water is about 18.015 g/mol, we multiply the moles of water by its molar mass to find the theoretical yield in grams: 768.311 g (42.628 moles x 18.015 g/mol). With an actual yield of 625 grams, we can now determine the percent yield: (625g / 768.311g) x 100% = 81.35%. Therefore, the percent yield of water for the stove is 81.35%.
Summarize a paragraph of what you’ve learned about mile carnival
You and a friend both roll a die at the same time. On the first roll, the dots on the two dice add up to 7. The second roll, they add up to 2. Which do you think was more likely, rolling a total of 2 or a total of 7? Explain your answer
Answer:
rolling a 7
Explanation:
Because to roll a 2 you'd need double one's and to roll a 7 you'd need 2 different numbers so you'd have a better chance of rolling 2 different numbers than rolling the same numbers.
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Rolling a total of 7 is more likely than a total of 2 when two dice are rolled because there are more combinations (six) that add up to 7 compared to only one combination that adds up to 2.
Explanation:Rolling a total of 7 is more likely than rolling a total of 2 when two six-sided dice are rolled. To determine the probability of these outcomes, we must consider all possible combinations that each die can produce. The sum of 7 can be achieved with six different combinations: (1,6), (2,5), (3,4), (4,3), (5,2), and (6,1). On the contrary, the sum of 2 can only be achieved with one combination: (1,1).
Since a fair six-sided die has an equal chance of landing on any one of its faces, each combination above has an equal chance of occurrence. Therefore, the probability of rolling a sum of 7 with two dice is 6/36 (since there are 6 favorable combinations out of a total of 36 possible combinations when two dice are rolled), which simplifies to 1/6. Meanwhile, the probability of rolling a sum of 2 is only 1/36, because there is only one favorable combination.
Hence, rolling a total of 7 has a higher probability than rolling a total of 2, since 1/6 is greater than 1/36.
How many atoms of chlorine are in 1.00 mol of chlorine gas
1.00 mole of chlorine gas contains 1.20442815×10²⁴ atoms of chlorine.
Explanation:The subject of this question is chemistry, specifically moles and atoms. In chemistry, a mole is a unit used to talk about a very large number of things — approximately 6.02214076×10²³, which is known as Avogadro's Number. When you have 1.00 mole of something, you have 6.02214076×10²³ of it. This means that 1.00 mol of chlorine gas (Cl₂) contains 2.00 moles of chlorine atoms. Therefore, 1.00 mol of chlorine gas contains 2.00 x 6.02214076×10²³ = 1.20442815×10²⁴ atoms of chlorine.
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Final answer:
In 1.00 mol of chlorine gas, which is diatomic (Cl₂), there are 1.2044 × 10²´ atoms of chlorine, as one mole of Cl₂ contains 6.022 × 10²³ molecules, and each molecule has two chlorine atoms.
Explanation:
To determine how many atoms of chlorine are in 1.00 mol of chlorine gas (Cl₂), we must understand the molecular composition of chlorine gas. Chlorine gas is diatomic, which means each molecule consists of two chlorine atoms. According to Avogadro's number, one mole of any substance contains 6.022 × 10²³ entities (atoms, molecules, etc.). Thus, in 1 mole of Cl₂, there are 6.022 × 10²³ molecules of Cl₂.
Since each Cl₂ molecule contains two chlorine atoms, to find the total number of chlorine atoms in one mole of Cl₂, we simply multiply Avogadro's number by two:
6.022 × 10²³ molecules/mol × 2 atoms/molecule = 1.2044 × 10²´ atoms of chlorine.
Therefore, 1.00 mol of chlorine gas contains 1.2044 × 10²´ atoms of chlorine.
Select the correct answer.
The chemical composition of most stars usually has which element in the highest concentration?
A. oxygen
B. hydrogen
OC. chromium
OD. lead
Answer:
B. Hydrogen
Explanation:
Answer:
B. Hydrogen
Explanation:
The most abundant gas is hydrogen which is fuel used by stars to create energy.
A student is designing an experiment about the factors that affect math
grades. Which statement best represents a possible hypothesis for this
experiment?
Answer: B. If students spend at least 1 hour per night studying math, then they will get a grade of 85 or higher.
Explanation: A hypothesis is defined as a tentative or predictions or an educated guess of scientific questions. A hypothesis is always done before performing an experiment.
The correct hypothesis for the given experiment will be "If students spend at least 1 hour per night studying math, then they will get a grade of 85 or higher" because it has an if-then statement which is a conditional statement where statement after "if represents hypothesis" and "then represents conclusion".
Hence, the correct answer is "B. If students spend at least 1 hour per night studying math, then they will get a grade of 85 or higher."
A possible hypothesis for an experiment on factors affecting math grades could be: 'The amount of time spent studying directly affects math grades'. This hypothesis can be tested by tracking students' study times and their corresponding math grades.
Explanation:In designing an experiment about factors that affect math grades, a possible hypothesis could be: 'The amount of time spent studying directly affects math grades.' This hypothesis is testable and directly relates to the experiment's topic. You could set up an experiment where you track a group of students' math grades and measure the amount of time they dedicate to studying math. If those who study more have better math grades, your hypothesis would be supported.
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Which step in naming unsaturated hydrocarbons is used for alkenes but not alkynes?
Answer:
Examine the multiple bond for cis- and trans- isomers.
Explanation:
Answer:
B. Examine the multiple bond for cis- and trans- isomers.
Explanation:
What is the molarity of the solution if 1.50 grams of CaCl2 is dissolved to make 0.095 liters of solution?
Answer:
0.142 M
Explanation:
First, convert grams of CaCl2 to moles. The molar mass of CaCl2 is 110.984 g/mol. You should get 0.0135 moles.
Divide moles by liters to find molarity. You should get 0.142 M
Will heating generally increase or decrease the amount of solid solute that will dissolve in the solution?
A. Increase
B. Decrease
Answer:
A: Increase
Explanation:
Benzene is a non-polar molecule, meaning that it does not have a positive or negative side. Which statement BEST describes how benzene will dissolve in water? A) Benzene can only exist as a gas and gases will not dissolve in water. B) Benzene dissolves well in water since polar molecules dissolve well in polar solvents. C) Benzene will dissolve in water because water is a universal solvent; it will dissolve anything. D) Benzene will not dissolve well in water since non-polar molecules do not dissolve in polar solvents.
Answer:
D) Benzene will not dissolve well in water since non-polar molecules do not dissolve in polar solvents.
Explanation:
Benzene is nonpolar because it is a symmetrical molecule in which all the bond dipoles cancel.
Polar solvents have large dipole moments or partial charge; they contain bonds between atoms with very different electronegativities.
Polar solvents like water cannot dissolve non-polar substances like benzene.
Benzene can only be dissolved by other non-polar solvents like n-hexane, carbon tetrachloride [tex](CCl_{4} )[/tex], e.t.c.
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To be considered _____ they must have lived over a very short period of time and had to be many of them.
A) An index fossil
B) A trace fossil
C) A petrified fossil
D) A carbon fossil
Answer:
A) Index Fossils
Explanation:
Index fossils are fossils used to define and identify geologic periods. Index fossils must have a short vertical range, wide geographic distribution and rapid evolutionary trends.
What are some physical properties in a water hat?
Was energy made or created
Answer:
Energy cannot be created nor destroyed
Explanation:
Law of conservation of energy
How many moles of MgCl2 are contained in 261.5 mL of a 0.005 M MgCl2 solution? Please show your work.
The answer for the following problem is mentioned below.
Therefore the no of moles in the magnesium chloride solution is 1.3075 moles.Explanation:
Molarity:
The no of moles of moles present in one litre of the solution is called molarity
Given:
molarity of magnesium chloride (m) = 0.005 M
volume of magnesium chloride solution (V) = 261.5 ml
To find:
no of moles of magnesium chloride solution (n)
We know;
molarity = [tex]\frac{n}{V}[/tex]
m = [tex]\frac{n}{V}[/tex]
where;
m represents the molarity of the magnesium chloride solution
n represents the no of moles of magnesium chloride solution
V represents the volume of magnesium chloride solution
So;
0.005 = [tex]\frac{n}{261.5}[/tex]
n = 0.005 × 261.5
n = 1.3075 moles
Therefore the no of moles in the magnesium chloride solution is 1.3075 moles.
i need helppp(science)
Answer:
Flat plains because when the magma flies out the spews out the volcano it will sinks to the ocean floor it rise and then once more eruptions come the magma will form with land that was previously there.
Explanation:
At what time of day are dissolved oxygen levels most likely to be highest?
Answer:
It's C - 6:00PM.
Explanation:
5. Which are generally less soluble, compounds with chlorate ions or carbonate ions?
Answer:
Compounds with Carbonate ions are less soluble than the compounds with Chlorate ions.
Explanation:
The reason is that the compounds with carbonate ions have less attraction between positive and negative charges. (Solvation)
A description of the solar system in which all the planets revolve around
the sun is called