Erica neutralized 80. 0 mL of 0. 70 M KOH solution with 28. 0 mL of H2SO4 solution. What was the concentration of the H2SO4 solution Erica used?
Answers
The concentration of the H₂SO₄ solution Erica used was approximately 2.0 M.
To find the concentration of H₂SO₄ solution used by Erica, we can use the concept of stoichiometry and the balanced chemical equation for the neutralization reaction between KOH and H₂SO₄:
KOH + H₂SO₄ -> K₂SO₄ + 2H2O
From the balanced equation, we can see that the mole ratio of KOH to H₂SO₄ is 1:1. This means that the number of moles of H₂SO₄ used in the reaction is equal to the number of moles of KOH. We can use this fact to calculate the number of moles of H₂SO₄ used:
moles of KOH = volume of KOH solution (in L) x concentration of KOH solution
moles of KOH = 80.0 mL x (1 L/1000 mL) x 0.70 mol/L = 0.056 mol
Since the mole ratio of KOH to H₂SO₄ is 1:1, the number of moles of H₂SO₄ used is also 0.056 mol. Now we can use the same formula as above to calculate the concentration of H₂SO₄:
concentration of H₂SO₄ = moles of H2SO4 / volume of H₂SO₄ solution (in L)
concentration of H₂SO₄ = 0.056 mol / (28.0 mL x 1 L/1000 mL) = 2.00 mol/L
Therefore, the concentration of the H₂SO₄ solution Erica used was 2.00 M.
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Related Questions
How will wolf emigration affect a grassland ecosystem that supports rabbits, the wolf's primary prey?
The wolf population will increase.
The producer population will increase.
The rabbit population will increase.
The rabbit population will decrease.
Answers
The emigration of wolves from a grassland ecosystem that supports rabbits which happens to be wolve's primary prey will lead to an increase in the population of rabbits in the ecosystem
Effects of Wolf's Emigration on a grassland ecosystemPredators and preys share a relationship such that the former feeds on the latter as food. Thus, the presence of wolves serves as a limiting factor to the growth of the rabbit population.
Therefore, once the wolves emigrate away from the ecosystem, the population of rabbits will thrive because one of its limiting factors has been removed.
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Is this equation balanced and in the lowest form? 4NH3 → 2N2 + 6H2
A.
Yes, because there are equal amounts of atoms of each element on both sides.
B.
No, because the coefficients could be reduced to 2,1, and 3.
C.
Yes, because the coefficients are in their lowest whole number ratio.
D.
No, because the coefficients could be reduced to 2, 2, and 4.
Answers
Answer:
B.) No, because the coefficients could be reduced to 2,1, and 3.
Explanation:
The equation is not in its lowest molar ratio form. In this case, all of the coefficients can be divided by 2 and still result in whole numbers.
As such, the correct balanced equation is:
2 NH₃ ----> N₂ + 3 H₂
The Hot-Wheel car was accelerating across the table at 0.25 meters per second squared (m/s^2) from an applied force of 10 N. What is the mass of the Hot Wheel car? *
40 grams
2.5 grams
0.025 grams
cannot be determined
Answers
Answer:
Explanation:
Consider the motion of a Hot Wheels car beginning from rest at an elevated position. The Hot Wheels car rolls down a hill and begins its motion across a level surface. Along the level surface, the Hot Wheels car collides with a box and skids to a stop over a given distance. How could work and energy be utilized to analyze the motion of the Hot Wheels car? Would the total mechanical energy of the Hot Wheels car be altered in the process of rolling down the incline or in the process of skidding to a stop? Or would the total mechanical energy of the Hot Wheels car merely be conserved during the entire motion?
Of course the answers to these questions begin by determining whether or not external forces are doing work upon the car. If external forces do work upon the car, the total mechanical energy of the car is not conserved; the initial amount of mechanical energy is not the same as the final amount of mechanical energy. On the other hand, if external forces do not do work upon the car, then the total mechanical energy is conserved; that is, mechanical energy is merely transformed from the form of potential energy to the form of kinetic energy while the total amount of the two forms remains unchanged.
While the Hot Wheels car moves along the incline, external forces do not do work upon it. This assumes that dissipative forces such as air resistance have a negligible affect on the car's motion. This is a reasonable assumption for the low speeds of the car and its streamline characteristics. Since external forces do not do work on the car, the total mechanical energy of the car is conserved while moving along the incline. As the work-energy bar charts in the animation below depict, energy is transformed from potential energy (the stored energy of position) to kinetic energy (the energy of motion). The car gains speed as it loses height. The bar chart also depicts the fact that the total amount of mechanical energy is always the same; when the two forms are added together, the sum is unchanging.
When the Hot Wheels car collides with the box and skids to a stop, external forces do a significant amount of work upon the car. The force of friction acts in the direction opposite the car's motion and thus does negative work upon the car. This negative works contributes to a loss in mechanical energy of the car. In fact, if 0.40 Joules of mechanical energy are lost, then -0.40 Joules of work are done upon the car. As this work is done, the mechanical energy of the car (in the form of kinetic energy) is transformed into non-mechanical forms of energy such as sound and heat.
A + B = AB
The greatest amount of AB would be produced if the equilibrium constant of the
reaction is equal to
A. 1.0 x 10-5
B. 1.0 x 10¹
C. 1.0 x 10-1
D. 1.0 × 105
I
Answers
The greatest amount of AB would be produced if the equilibrium constant of the reaction is equal to \(1.0 \;X \;10^5\). Hence, option D is correct.
What is an equilibrium constant?A number that expresses the relationship between the amounts of products and reactants present at equilibrium in a reversible chemical reaction at a given temperature.
The equilibrium constant expression is a mathematical relationship that shows how the concentrations of the products vary with the concentration of the reactants.
If the value of K is greater than 1, the products in the reaction are favoured. If the value of K is less than 1, the reactants in the reaction are favoured.
Hence, option D is correct.
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A sample of helium is initially at 535 torr in a volume of 2.85 L. At 24.7∘C you found the density of He to be 0.130 g/L and the density of Ar to be 1.30 g/L even though both samples had the same number of moles. Which one of the following best explains why the densities are different?
A) Argon is a heavier atom than helium, so it has more mass in the same volume occupied by the gas. B) Argon is a larger atom than helium so it occupies more volume. C) An argon atom is more dense than a helium atom. D) The densities are different only because of rounding.
Answers
The correct answer is A) Argon is a heavier atom than helium, so it has more mass in the same volume occupied by the gas.
The density of a gas is directly proportional to its molar mass. Since argon has a larger molar mass than helium, it will have a higher density than helium even if they both have the same number of moles. Therefore, option A is the correct explanation for the difference in densities. Option B is incorrect because the size of an atom does not necessarily determine its density. Option C is also incorrect because density is related to mass, not the density of individual atoms. Option D is incorrect because the difference in densities is not due to rounding.
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At what colored dot does the map indicate the steepest location? Provide an explanation for your reasoning below.
Answers
how to make testosterone with sodium borohydride
Answers
Sodium borohydride is not typically used to synthesize testosterone. Testosterone is a steroid hormone that is synthesized in the human body through a complex series of biochemical reactions
This process involves the conversion of cholesterol into testosterone through a series of enzymatic reactions that are regulated by various hormones and signaling molecules.It is not recommended to attempt to synthesize testosterone at home as it can be dangerous and illegal. Synthesis of testosterone requires specialized equipment, a deep understanding of organic chemistry, and access to potentially hazardous chemicals. Additionally, attempting to synthesize testosterone without proper training and equipment can result in serious harm to yourself and others. In conclusion, attempting to synthesize testosterone using sodium borohydride is not recommended and should not be attempted.
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You have a 2.50 gram sample of potassium permanganate. How many moles of potassium permanganate are in your sample?
a. 0.016 mols
b. 158.04 mols
c. 15.8 mols
d. 63.22 mols
Answers
The number of moles of potassium permanganate in 2.5 grams of the solution is 0.016moles (option A).
How to calculate number of moles?The number of moles of a substance is amount of the substance of a system which contains exactly 6.02214076 × 10²³ atoms or molecules.
The number of moles of a substance can be calculated by dividing the mass of the substance by its molar mass as follows:
no of moles = mass ÷ molar mass
According to this question, there are 2.50 grams sample of potassium permanganate. The molar mass of potassium permanganate is 158.034 g/mol.
no of moles = 2.5g ÷ 158.034g/mol
moles = 0.016moles
Therefore, 0.016moles are in 2.5 grams of the solution.
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Considering the definition of molar mass, the correct answer is option a. 0.016 moles of potassium permanganate are in the sample
Definition of molar massThe molar mass of substance is a property defined as the amount of mass that a substance contains in one mole.
The molar mass of a compound is the sum of the molar mass of the elements that form it multiplied by the number of times they appear in the compound.
Molar mass of potassium permanganateIn this case, you know the molar mass of the elements is:
K= 39.1 g/moleMn= 54.94 g/moleO= 16 g/moleSo, the molar mass of the compound KMnO₄ is calculated as:
KMnO₄= 39.1 g/mole + 54.94 g/mole + 4× 16 g/mole
Solving:
KMnO₄= 158.04 g/mole
Moles of 2.50 grams of KMnO₄You can apply the following rule of three: If by definition of molar mass 158.04 grams of the compound are contained in 1 mole, 2.50 grams are contained in how many moles?
amount of moles= (2.50 grams× 1 mole)÷ 158.04 grams
mass= 0.016 moles
Finally, there are 0.016 moles.
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A student investigated the factors that affect math grades. Which statement from the lab report best represents a conclusion for this investigation?
Answers
The correct answer choice from the statement above about investigated factors from lab results is :
Students who spend less time studying after school get lower math grade
Option D is the correct answer
What is mathlab?This is an online platform where mathematics tutors help students to solve their difficulties in mathematics.
Mathematics is one of the most important aspect of knowledge in the education.
So therefore, The correct answer choice from the statement above about investigated factors from lab results is :
Students who spend less time studying after school get lower math grade
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How many of a magnesium atom’s electrons are valence electrons?
Answers
Magnesium (Mg) has an atomic number of 12, which means it has 12 electrons. In the case of magnesium, it has an electron configuration of [Ne] 3s2, which means it has 2 valence electrons.
The number of valence electrons in an atom is equal to its electron configuration in the highest energy level (also called the outermost energy level). In the case of magnesium, it has an electron configuration of [Ne] 3s2, which means it has 2 valence electrons. Valence electrons are the outermost electrons of an atom that are involved in chemical reactions and bonding with other atoms. They are the electrons in the highest energy level of an atom and determine its chemical reactivity and behavior. The number of valence electrons in an atom can be determined by its electron configuration and the periodic table, and is used to predict its chemical properties, such as its tendency to form bonds with other atoms and its reactivity with other chemicals.
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(115 pts.) Ferrous nitrate reacts with silver nitrate in aqueous solution to form ferric nitrate and metallic
silver according to the chemical equation
Fe(NO3)2(aq) + AgNO3(aq) + Fe(NO3)3(aq) + Ag(s),
for which K = 3.0.
(a) Derive the net ionic equation for this reaction.
(b) Determine whether the reaction is a replacement reaction or an oxidation-reduction
reaction, and, in the latter case, identify the oxidizing and reducing agents.
(c) Write the expression for Q in terms of the activities (the [] symbols) of the species
responsible for driving the reaction to equilibrium.
Answers
Answer:
Explanation:
a )
Fe(NO₃)₂(aq) + AgNO₃(aq) = Fe(NO₃)₃(aq) + Ag(s)
Fe⁺² + 3NO₃⁻ + Ag⁺ = Fe⁺³ + Ag + 3NO₃⁻
b )
Reaction is an oxidation - reduction reaction .
oxidation :--
Fe⁺² = Fe⁺³ + e⁻
Reduction : ---
Ag⁺ + e = Ag
c )
Q = [ Fe( NO₃)₃ ] / [ Fe(NO₂) ] [ AgNO₃ ]
22 Directions: Select the correct food web. In Ottawalley National Park, grass is abundant. Gazelles spend most of the day feeding on grass, their main source of food. Gazelles are hunted and eaten by the park's wild dogs. Lions are a predator of both wild dogs and gazelles. Which of the following food webs best represents the relationships described above? lion lion wild dog - wild dog gazelle gazelle grass grass lion lion wild dog wild dog gazelle gazelle grass grass
Answers
Answer:
Explanation:
22 Directions: Select the correct food web. In Ottawalley National Park, grass is abundant. Gazelles spend most of the day feeding on grass, their main source of food. Gazelles are hunted and eaten by the park's wild dogs. Lions are a predator of both wild dogs and gazelles. Which of the following food webs best represents the relationships described above? lion lion wild dog - wild dog gazelle gazelle grass grass lion lion wild dog wild dog gazelle gazelle grass grass
Answer:
its the 4th one i just did it on study island
Explanation:
please help
Why does a smoke detector use alpha radiation rather than beta or gamma radiation?
Answers
Answer:To be honest i dont know
Explanation:
e
Answer:
Explanation:
Alpha radiation ionizes the air. When smoke interaccts with the ionized particles it causes the alarm to sound.
Students are experimenting with a substance that they
think can be added to soil to increase the number of
flowers a certain plant will make. They set up 20 pots of
soil, each planted with the same type of seed. They
divide the pots into two groups and add 15 drops of the
substance to pots in one group and only 10 drops to pots
in the other group. After the plants grow for four weeks,
the students count how many flowers each plant has
made
What does this experimental investigation lack?
a control group
an independent variable
a dependent variable
a procedure
Answers
Answer:
A: Control Group
Explanation:
The control group is part of an expierment left untouched by anything that could possibly alter it, in the case of this question, the students have two groups of plants that have drops of liquid that could alter them, in order to see the growth, and to see if the liquid actually did anything, in order to do so, you would have to have a untouched plant, that shows what it looks like with out any alteration from researchers. So the answer would be control group.
Answer:
i think control group?
Explanation:
meow x3 UwU
The pressure for 1.0 mol of a gas at 0oC in 3.0 L container is calculated to be 7.5 atm using the ideal gas equation (PV = nRT). The pressure of the gas is measured and found to be 7.1 atm. Which of the following best explains the reason for the discrepancies in the two values?
Answers
The best explanation would be that the temperature of the gas has dropped before measuring the pressure.
Relationship between temperature and pressure of gasesAccording to pressure law, the pressure of a gas is directly proportional to its temperature, provided the volume of the gas remains constant.
Thus, since the initial pressure of the gas was calculated to be 7.5 atm, the temperature of the gas must have dropped in order for the measured pressure to be 7.1 atm.
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which of the following statements are true regarding the remainder of the experiment if the scientist wants to use the combined gas law to calculate different properties?a.the pressure must stay at 200 kpa, but the volume, temperature, and amount can change.b.the volume must stay at 300 ml, but the pressure, temperature, and amount can change.
Answers
If the scientist intends to apply the combined gas law to determine various attributes, the following statement is accurate: (A) The pressure must remain at 200 kPa, but the volume, temperature, and amount can change.
Among the statements provided:
A. The statement "The pressure must stay at 200 kPa, but the volume, temperature, and amount can change" is true regarding the remainder of the experiment if the scientist wants to use the combined gas law to calculate different properties. In the combined gas law, the pressure is a constant value, while the volume, temperature, and amount of gas can vary.
B. The statement "The volume must stay at 300 mL, but the pressure, temperature, and amount can change" is not true regarding the remainder of the experiment if the scientist wants to use the combined gas law. The combined gas law allows for changes in all four variables: pressure, volume, temperature, and amount of gas.
C. The statement "The temperature must stay at 900 K, but the pressure, temperature, and amount can change" is not true regarding the remainder of the experiment if the scientist wants to use the combined gas law. The combined gas law considers variations in temperature along with other variables.
D. The statement "The amount must stay at 0.008 mol CO₂, but the temperature, pressure, and volume can change" is not true regarding the remainder of the experiment if the scientist wants to use the combined gas law. The combined gas law takes into account changes in all four variables, including the amount of gas.
In summary, only statement A is true regarding the remainder of the experiment if the scientist wants to use the combined gas law.
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Complete question :
Which of the following statements are true regarding the remainder of the experiment if the scientist wants to use the combined gas law to calculate different properties?
A. The pressure must stay at 200 kPa, but the volume, temperature, and amount can change.
B. The volume must stay at 300 mL, but the pressure, temperature, and amount can change.
C. The temperature must stay at 900 K, but the pressure, temperature, and amount can change.
D. The amount must stay at 0.008 mol CO2, but the temperature, pressure. and volume can change. are filled with comcsodiocodec
A water sample that has been diluted to 10-3 has been diluted by a factor of _______ times.
a. 1/300
b. 300
c. 1/1,000
d. 1,000
e. 3,000
Answers
In this case, a water sample has been diluted to 10^-3, which means it has been diluted by a factor of 1,000 times. So, the correct answer is:
The answer is option b. 300.
When a solution is diluted, it means that more solvent (usually water) has been added to decrease the concentration of the solute. The dilution factor is the ratio of the final volume of the solution to the initial volume of the solution.
In this case, the water sample has been diluted to 10-3, which means that the concentration of the original solution has been reduced by a factor of 10-3.
To calculate the dilution factor, we need to take the reciprocal of the concentration reduction factor:
Dilution factor = 1/10-3 = 1,000
So the water sample has been diluted by a factor of 1,000 times.
Therefore, the correct answer is option b. 300 is not the dilution factor, but rather the concentration reduction factor (1/300), which is the reciprocal of the dilution factor.
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Which change to the setup is least likely to cause an increase production of bubbles?
Adding a bright light source.
Adding a source of carbon dioxide to the water.
Adding a different fluid to the water.
Adding a second plant to the test tube.
Answers
Answer:
D, adding a second plant to the test tube
write the ground-state electron configuration for calcium, ca.
Answers
the electron configuration for calcium can be written as:
1s2 2s2 2p6 3s2 3p6 4s2
The atomic number of calcium is 20, indicating that it has 20 electrons. The ground-state electron configuration for calcium can be written using the following rules: 1s2 2s2 2p6 3s2 3p6 4s2
The first number before each sub-shell indicates the principal quantum number (n), while the letter indicates the type of sub-shell (s, p, d, or f) and the superscript indicates the number of electrons in that sub-shell. Therefore, the electron configuration for calcium can be written as:
1s2 2s2 2p6 3s2 3p6 4s2. Electronic configuration refers to the distribution of electrons in the orbitals of an atom or ion. It describes the arrangement of electrons in the electron shells or energy levels and subshells or orbitals of an atom or ion.
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PLEASE HELP!!! Lead (II) nitrate as Pb(NO3)2 and potassium iodide as KI combine to form the products shown.
2 KNO3 + PbI2
How many moles of each reactant are involved in the reaction?
(1 point)
Responses
2 moles of lead (II) nitrate and 2 moles of potassium iodide
2 moles of lead (II) nitrate and 2 moles of potassium iodide
1 mole of lead (II) nitrate and 1 mole of potassium iodide
1 mole of lead (II) nitrate and 1 mole of potassium iodide
1 mole of lead (II) nitrate and 2 moles of potassium iodide
1 mole of lead (II) nitrate and 2 moles of potassium iodide
2 moles of lead (II) nitrate and 1 mole of potassium iodide
Answers
The number of moles of each reactant involved in the reaction are as follows: 1 mole of lead (II) nitrate and 2 moles of potassium iodide (option C).
What is a chemical reaction?A chemical reaction is said to occur when there is a breaking or formation of interatomic bonds and involves the transformation of one or more substances into others.
This question states that lead (II) nitrate and potassium iodide react to form potassium nitrate and lead iodide as follows:
Pb(NO₃)₂ + 2KI → PbI₂ + 2KNO₃
It can be observed from the above equation that 1 mole of lead nitrate and 2 moles of pottasium iodide are needed on the reactant sides.
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Hg2(NO3)2 + Na2CO3 = NaNO3 + HgCO3 balance this
Answers
Answer:
Hg(NO3)2 + Na2CO3 --> 2NaNO3 + HgCO3
compare protons neutrons and electrons to a family or a business
Answers
For a p-type silicon, in which the dopant concentration is
2*10^18 cm^-3, find the electron concentration at room temperature.
Express answer in cm^-3.
Answers
The electron concentration at room temperature is 1.125 x 10^4 /cm3 for p-type silicon with the given dopant concentration.
In an intrinsic semiconductor, the electron concentration equals the hole concentration. When doping a semiconductor, this is not the case.
The carrier concentration can be calculated using the formula below: nd - number of donor atoms/cm3 (for n-type material) or na - number of acceptor atoms/cm3 (for p-type material).
For p-type silicon, the electron concentration at room temperature, ne is given by: ne = ni^2 / Na
Where ni is the intrinsic carrier concentration and Na is the acceptor concentration.
Substituting the values in the formula we get: ni = 1.5 x 10^10/cm3Na = 2 x 10^18/cm3ne = (1.5 x 10^10)^2/2 x 10^18= 1.125 x 10^4 /cm3
Therefore, the electron concentration at room temperature is 1.125 x 10^4 /cm3 for p-type silicon with the given dopant concentration.
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PLEASE HELP DUE IN 15!!!!!!!!!!!! WILL GIVE BRAINLIEST!!
Question 17: 2C2H6 + 7O2 ---> 4CO2 + 6H20
How many moles of O2 are needed to completely react with 4.50 moles of C2H6 according to the above equation?
a. 5.8 moles
b. 3.11 moles
c. 1.29 moles
d. 63.0 moles
Answers
Explanation:
n=,4.5 moles C2H6
the ratio 2:7
4.5:x
x=15.75 moles
HELP ASTROMONY 20 POINTS AND BRAINLIEST
Answers
Answer: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
Explanation: Hope this helps
FILL THE BLANK. ibm's watson utilizes a massively parallel, text mining–focused, probabilistic evidence-based computational architecture called ________.
Answers
IBM's Watson utilizes a massively parallel, text mining-focused, probabilistic evidence-based computational architecture called DeepQA.
IBM's Watson utilizes a massively parallel, text mining-focused, probabilistic evidence-based computational architecture called DeepQA.
IBM's Watson utilizes a massively parallel, text mining-focused, probabilistic evidence-based computational architecture called DeepQA.
IBM's Watson utilizes a massively parallel, text mining-focused, probabilistic evidence-based computational architecture called DeepQA.
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50 POINTS
a 6.7g piece of rock boiled to 100.0 degrees celsius is placed in 100.0 mL of water with an initial temperature of 23 degrees celsius. the equilibrium temperature when the rock is added is 45 degrees celsius. what is the specific heat of the rock?
Answers
q = m * c * ΔT
where q is the heat absorbed or released, m is the mass of the substance, c is the specific heat of the substance, and ΔT is the change in temperature.
In this case, the heat released by the rock is equal to the heat absorbed by the water, so we can write:
q_rock = -q_water
where q_rock is the heat released by the rock and q_water is the heat absorbed by the water.
The heat released by the rock can be calculated as:
q_rock = m_rock * c_rock * ΔT
where m_rock is the mass of the rock and c_rock is the specific heat of the rock. We know that the mass of the rock is 6.7 g and the ΔT is 45 - 100 = -55 degrees Celsius (because the rock is losing heat to the water).
The heat absorbed by the water can be calculated as:
q_water = m_water * c_water * ΔT
where m_water is the mass of the water and c_water is the specific heat of water. We know that the mass of the water is 100.0 g (which is equivalent to 100.0 mL) and the ΔT is 45 - 23 = 22 degrees Celsius (because the water is gaining heat from the rock).
Since q_rock = -q_water, we can set the two equations equal to each other and solve for c_rock:
m_rock * c_rock * ΔT = -m_water * c_water * ΔT
c_rock = -m_water * c_water * ΔT / (m_rock * ΔT)
Plugging in the values, we get:
c_rock = -(100.0 g) * (4.184 J/g°C) * (22°C) / [(6.7 g) * (-55°C)]
c_rock = 0.811 J/g°C
Therefore, the specific heat of the rock is 0.811 J/g°C.
Answer:
To calculate the specific heat of the rock, you can use the formula for heat transfer: Q = mcΔT, where Q is the heat transferred, m is the mass of the substance, c is the specific heat capacity and ΔT is the change in temperature.
In this case, we can assume that the heat lost by the rock is equal to the heat gained by the water. Therefore:
Q(rock) = Q(water)
m(rock)c(rock)(T(final) - T(initial, rock)) = m(water)c(water)(T(final) - T(initial, water))
where m(rock) = 6.7 g, T(initial, rock) = 100.0°C, T(final) = 45°C, m(water) = 100.0 g (assuming the density of water is 1 g/mL), c(water) = 4.18 J/g°C (specific heat capacity of water), and T(initial, water) = 23°C.
Substituting these values into the equation above and solving for c(rock), we get:
c(rock) = (m(water)c(water)(T(final) - T(initial, water))) / (m(rock)(T(final) - T(initial, rock)))
c(rock) = (100.0 g * 4.18 J/g°C * (45°C - 23°C)) / (6.7 g * (45°C - 100.0°C))
c(rock) ≈ 1.26 J/g°C
So the specific heat of the rock is approximately 1.26 J/g°C.
Match each scientist to their discovery regarding the atom
Thomson
Electrons have a charge of -1.
Rutherford
Atoms are indivisible
Millikan
Atoms have a positive nucleus
Dalton
Atoms contain electrons.
Answers
Answer:
Thomson--atoms cotain electron
Ernest Rutherford--atoms have a positive nucleus
R.A Millikan--electrons have Q=-1
Dalton--atoms are indivisible
Millikan---> Electrons have a charge of -1
Rutherford ---> Atoms have a positive nucleus
Thomson -----> Atoms contain electrons
Dalton --------> Atoms are indivisible
The atomic theory went through several modifications and different scientists proposed various models of the atom until our present conception of the atom was developed.
The atom was first defined as the smallest indivisible particle of a substance. This idea of "indivisibility" of the atom stems from Dalton's theory.
The fact that atoms were composed of negatively charged electrons was proven by the experiments of J.J Thompson using the cathode ray tube. Millikan's charge to mass experiment showed that the electron has a charge of -1.
Rutherford, in his famous gold foil experiment showed that atoms were composed of a positively charged nucleus.
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How many joules of energy are released when 2 grams of ice melt?
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Answer:
If it takes 334 joules of energy to melt 1 gram of ice then 2 gram should be 668 joules which is your answer.
In three to five sentences describe the mistake the student made and determine whether or not the reaction is a redox reaction. explain your answer (4 points)
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A redox reaction is when there is simultaneous oxidation and reduction. CuO+H2→Cu+H2O. Example: In this reaction, hydrogen is oxidised to water while copper oxide is reduced to copper.
By assuming that all bindings to the atoms in molecules are ionic, we can use the oxidation numbers assigned to atoms in molecules to detect redox reactions. In a reaction, oxidation is shown by an increase in the number of oxidations, and reduction is indicated by a copper. Consider the sodium-water reaction. In this reaction, sodium removes hydrogen from water while both becoming oxidised by obtaining oxygen and reducing the water to hydrogen by removing oxygen at the same time.
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