Answer:
Q = 25.6 j
Explanation:
Given data:
Energy needed= ?
Mass of lead = 10.0 g
Initial temperature = 30 °C
Final temperature = 50°C
Cp = 0.128 j/g.°C
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 50°C - 30°C
ΔT = 20°C
Now we will put the values in formula.
Q = 10 g × 0.128 j/g.°C × 20°C
Q = 25.6 j
19 points:
The chemical reaction represented by the following balanced chemical equation takes place in aqueous
solution: MnO4 + 5 Fe2+8H - Mn2 + 5 Fe3+ 4H2O
When the disappearance of the permanganate ion, MnO4, is monitored, the rate of reaction for the
consumption of the ion is 4.0x10^2 mol/L.s. Calculate the reaction rate for all other reactants and products.
Answer:
Explanation:
MnO₄⁻ + 5 Fe2⁺ + 8H⁺ = Mn⁺² + 5Fe⁺³ + 4H₂O.
- d [MnO₄⁻ ] / dt = 4 x 10² mol /L.s.
- [ Fe²⁺ ] / dt = 5 x - d [MnO₄⁻ ] / dt
= 5 x 4 x 10² mol /L.s.
20 x 10²
- d [ H⁺] / dt = 8 x - d [MnO₄⁻ ] / dt
= 8 x 4 x 10²
= 32 x 10² mol /L.s.
+d [ Mn⁺² ] / dt = - d [MnO₄⁻ ] / dt
= 4 x 10² mol /L.s
+d [ Fe⁺³ ] / dt = 5 x - d [MnO₄⁻ ] / dt
= 20 x 10² mol /L.s
a. Adding or removing gas to a constant volume. What happens to the pressure? Is this a
direct or indirect relationship?
I think the answer is direct
Are scientific theories all proven facts?
Answer:
Any scientific theory must be based on a careful and rational examination of the facts. Facts and theories are two different things. In the scientific method, there is a clear distinction between facts, which can be observed and/or measured, and theories, which are scientists' explanations and interpretations of the facts.
Explanation:
A scientific theory is an explanation of an aspect of the natural world that can be repeatedly tested and verified in accordance with the scientific method, using accepted protocols of observation, measurement, and evaluation of results.
What role does genetic variation play in the existence of an organism?
Why is a coin able to float on top of water?
Answer:
i think it is because of surface tension
Explanation:
Answer:
sample response - Surface tension is the result of water molecules pulling inward with a strong attractive force. This attractive force brings the molecules on the surface of the water close together and causes the surface of the water to be drawn toward the water molecules beneath the surface. Since there are no water molecules above the surface, there are uneven forces. This causes surface tension, allowing the coin to float on the water’s surface.
Explanation:
ywww :) from edg.
what is the mass in grams of 0.375 mol if the element potassium, k?
Answer: 14.625g
Explanation:
No of moles= mass given/molar mass
No of moles given= 0.375mol
Mass is the unknown (?)
Molar mass of K= 39
No of moles = mass given/molar mass
Substitute the values
0.375= mass/39
Cross multiply
Mass = 39×0.375
Mass= 14.625g
The mass is 14.625g
Answer:
14.625g
Explanation:
Mass of a substance =number of moles of the substance × molar mass of the substance
Substance of interest is potassium, K
Given, Number of moles of K =0.375mol
Molar mass of K =39g/mol
Therefore, mass of K =0.375×39=14.625g
How much heat is required, in calories, to raise the temperature of 57.8g of silver from 17.0oC to 43.5oC, if the specific heat of silver = 0.057cal / goC?
Answer:
83.60oC per cal
Explanation:
The amount of heat required to raise the temperature of 57.8g of silver from 17.0°C to 43.5°C is 87.31 calories.
How to calculate energy?The energy required to raise the temperature of a substance can be calculated using the following formula:
Q = m × c × ∆T
Where;
Q = quantity of heat absorbed or releasedm = mass of the substancec = specific heat capacity∆T = change in temperatureQ = 57.8 × 0.057 × (43.5 - 17)
Q = 87.31calories
Therefore, the amount of heat required to raise the temperature of 57.8g of silver from 17.0°C to 43.5°C is 87.31 calories.
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Therefore, the independent variable was
and the dependent
variable was
In a study or experiment, the independent variable is what the researcher manipulates and the dependent variable is the response being measured. An example of this would be studying the effect of sunlight (independent variable) on plant growth (dependent variable).
Explanation:In any experiment or study, the independent variable is the factor that the researcher manipulates or chooses intending to cause a change. It's the variable you have control over. The outcome of this change is observed and measured in the dependent variable. The dependent variable responds to the change you made to the independent variable. For example, if you were studying the effect of varying amounts of sunlight on plant growth. The amount of sunlight would be the independent variable (as you are controlling the amount each plant gets), and the plant growth would be the dependent variable (as you measure it after).
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Answer:
first part of the problem: temperture and volume
second part: tempture and volume
hope this helps
Explanation:
How many representative particles are in 1.45 g of a molecular compound with a molar mass of 237 g?
Answer: 3.68 x 10^21 particles
Explanation:
Based on Avogadro's law:
1 mole of any substance has 6.02 x 10^23 atoms
Since 1 mole is the same as molar mass of a substance
237 g = 6.02 x 10^23 atoms
1.45g = Z atoms
To get the value of Z, cross multiply:
(Z atoms x 237g) = (6.02 x 10^23 atoms x 1.45g)
237Z = 8.729 x 10^23
Z = (8.729 x 10^23 / 237)
Z = 3.68 x 10^21
Thus, there are 3.68 x 10^21 representative particles in 1.45 g of the molecular compound.
To find the number of representative particles in 1.45 g of a substance with a molar mass of 237 g/mol, first calculate the number of moles by dividing the mass by the molar mass, then multiply by Avogadro's number. The calculation shows there are approximately 3.69 × 10²± representative particles.
Explanation:To calculate the number of representative particles in 1.45 g of a molecular compound with a molar mass of 237 g/mol, we need to use Avogadro's number and the concept of molar mass.
First, we determine the number of moles in 1.45 g:
Number of moles = mass (g) / molar mass (g/mol) = 1.45 g / 237 g/mol.
After finding the number of moles, we use Avogadro's number (6.02 × 10²³ particles/mol) to find the number of representative particles:
Number of particles = number of moles × Avogadro's number.
Therefore, we would calculate:
1.45 g / 237 g/mol = 0.0061180 moles.
Number of particles = 0.0061180 moles × 6.02 × 10²³ particles/mol.
After performing the multiplication, we find:
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If 0.214 mol of argon gas occupies a volume of 343.4 mL at a particular temperature and pressure, what volume would 0.375 mol of argon gas occupy under the same conditions?
Answer:
601.8mL
Explanation:
First, we'll begin by obtaining an equation connecting volume and number of mole together. This is illustrated below:
From the ideal gas equation:
PV = nRT
Divide both side by P
V = nRT/P
Now divide both side by n
V/n = RT/P
Under the same conditions simply means temperature(T), pressure (P) and the gas constant (R) are all constant i.e
RT/P => constant
Therefore, the above equation can be written as:
V1/n1 = V2/n2
Now we can solve for the final volume otherwise known as the new volume as follow:
Data obtained from the question include:
n1 (initial mole) = 0.214 mol
V1 (initial volume) = 343.4 mL
n2 (final mole) = 0.375 mol
V2 (final volume) =?
Applying the the equation V1/n1 = V2/n2, the final volume is obtain as illustrated below:
V1/n1 = V2/n2
343.4/0.214 = V2/0.375
Cross multiply to express in linear form
0.214 x V2 = 343.4 x 0.375
Divide both side by 0.214
V2 = (343.4 x 0.375)/0.214
V2 = 601.8mL
Therefore, 0.375 mol of argon gas will occupy 601.8mL under the same condition.
The illustration shows the path of a laser leaving a laser pointer. At what point is the laser being absorbed?
Answer:
D not c
Explanation:
The point showing the laser being absorbed is D.
What is Laser?LASER stands for “Light Amplification by Stimulated Emission of Radiation”
Lasers not only increase the intensity of light but also generate light. Lasers emit light by stimulated emission of radiation, which increases the intensity of radiation. Some lasers produce visible light, and some produce ultraviolet or infrared rays.
The laser light exhibits some peculiar properties compared with the conventional light which make it unique.
Therefore, The point showing the laser being absorbed is D.
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what happens if 0.87 mol NaCl is dissolved in pure water creating 3.00 L of solution, what is its molarity of the resulting solution?
Answer:
0.29 molL-1 or 0.29 M
Explanation:
Now we have to use the formula
n=CV
Where
n= number of moles = 0.87 moles
C= concentration of the solution (the unknown)
V= volume of the solution = 3.00L
Now having specified all parameters except the unknown (molarity if the sodium chloride solution) we can now proceed to find it.
C= n/V
C= 0.87mol/3.00L
C= 0.29 molL-1
Answer:
0.29 mol/L
Explanation:
When sodium chloride (NaCl) is dissolved in water, it will dissociates to produce sodium ion (Na+) and chloride ion (Cl-) in solution as shown below:
NaCl —> Na+ + Cl-
Next, let us calculate the molarity of NaCl. This is illustrated below:
Mole of NaCl = 0.87 mole
Volume of solution = 3 L
Molarity =?
Molarity = mole of solute /Volume
Molarity = 0.87mole /3L
Molarity = 0.29 mol/L
Therefore, the molarity of NaCl is 0.29 mol/L
Which statement describes a reaction at equilibrium?
1. The mass of the products must equal the mass of the reactants
2. The entropy of the reactants must equal the entropy of the products
3. The rate of formation of the products must equal the rate of formation of the reactants.
4. The number of moles of the reactants must equal the number of moles of the products.
Answer:
3. The rate of formation of the products must equal the rate of formation of the reactants.
Explanation:
The reaction at the equilibrium represents the rate of formation of the products that is equivalent to the rate of formation of the reactants.
What is the reaction?It is arise at the equilibrium at the time when the amounts of reactants or products should be same. The Chemical equilibrium refers to the dynamic process that represent the rate of formation of products via the forward reaction i.e. equivalent to the rate where the products should be reform reactions via the reverse reaction.
hence, the option 3 is correct.
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3. How many grams of
CoCl, in 1/2 Liter would be
used to make a 1.0 molar
solution?
Answer:
47 grams CoCl needed.
Explanation:
1 mole weight of CoCl in 1 Liter solution => 1.0 molar solution
∴ 1/2 mole weight of CoCl in 1/2 Liter solution => 1.0 molar solution.
1/2 mole weight of CoCl = 1/2(94 g/mole) = 47 grams CoCl needed.
Final answer:
To make a 1.0 molar solution of CoCl₂ in half a liter of water, you would need 64.915 grams of CoCl₂, using its molar mass of 129.83 g/mol.
Explanation:
The question you are asking is about making a 1.0 molar solution of cobalt(II) chloride, CoCl₂, in 1/2 liter of water. To calculate the amount of CoCl₂ required, we will use the formula:
mass (grams) = molarity (mol/L) × volume (L) × molar mass (g/mol).
First, we need to establish the molar mass of CoCl₂. Cobalt has an atomic mass of about 58.93 g/mol, and each chlorine has an atomic mass of about 35.45 g/mol. So, the molar mass of CoCl₂ is:
58.93 g/mol (for Co) + 2 × 35.45 g/mol (for Cl) = 129.83 g/mol.
Now, we can calculate the required mass of CoCl₂ for a 1.0 M solution:
mass = 1.0 mol/L × 0.5 L × 129.83 g/mol = 64.915 grams.
Therefore, you would need 64.915 grams of CoCl₂ to make a 1.0 molar solution in half a liter of water.
Which of the following statements best describes what happens to water during vaporization?
A. The temperature of the water increases until the water molecules react with nitrogen in the air.
B. Water molecules overcome intermolecular forces and change into the gas phase.
C. Water molecules steadily increase in kinetic energy and gradually become further apart.
D. The temperature of the water increases until the water molecules separate into oxygen and hydrogen gas.
Answer: im pretty sure its D
Explanation:
According to intermolecular forces of attraction, statement which best describes what happens to water during vaporization is 'B'.
What are forces of attraction ?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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Harry uses a pulley to pull up a bucket of water from a well. He uses chemical energy in his body to apply mechanical energy to the system. Which of the following energy transformations also occurs as the bucket rises?
In pulling up a bucket of water, Harry uses chemical energy converted into mechanical energy, which transforms into gravitational potential energy as the bucket rises.
Explanation:When Harry pulls up the bucket of water from the well using a pulley, a number of energy transformations occur. Initially, he uses the chemical energy in his body (obtained from the food he eats) to apply mechanical energy to the system (pulley and bucket). As the bucket begins to rise, the mechanical energy is transformed into gravitational potential energy. This is similar to water at a higher elevation having a higher potential energy than water at a lower elevation.
This process demonstrates a key principle in physics: energy is conserved and can be transferred or transformed from one form to another, but is never lost. So in this case, the chemical energy in Harry's muscles is converted into mechanical energy, which in turn is transformed into gravitational potential energy as the bucket is lifted higher in the well.
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Which elements have similar behavior?
A. Barium
B. Silicon
C. Aluminum
D. Strontium
E. Osmium
F. Beryllium
Answer:
The elements which have similar behavior are Barium, strontium and beryllium.
The elements that have similar behavior are Barium, strontium, and beryllium. The correct options are A, D, and F.
What are chemical elements?Chemical elements are substances present in the periodic table. There are 118 elements in the periodic table. All elements are arranged according to the atomic numbers of the elements.
Barium, strontium, and beryllium belong to the same group of the periodic table. They are called alkaline earth metals. They are very reactive at room temperature. These metals are all white, silvery, and shiny metals.
Alkaline earth metals have two electrons in their outer shell. Which gives them the same oxidation number, which is 2+. Alkaline earth metals have beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).
Thus, the correct options are A, Barium, D, Strontium, and F, Beryllium.
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Describe the electrolysis of molten lithium chloride to produce lithium and chlorine gas.
Answer:
it mainly depends what state of lithium chloride that you use to electrolysis, if you choose the aqueous state of lithium chloride then you'll have a produce of chlorine and oxygen at the anode, lithium and hydrogen is produce at the cathode but lithium will react with water to form lithium hydroxide
Explanation:
Final answer:
The electrolysis of molten lithium chloride results in the formation of lithium metal at the cathode and chlorine gas at the anode, involving the direct conversion of chemical energy into electrical energy through electrolysis.
Explanation:
The question is about describing the electrolysis of molten lithium chloride to produce lithium and chlorine gas. The process of electrolysis involves passing an electric current through molten lithium chloride (LiCl), resulting in the formation of lithium metal (Li) and chlorine gas (Cl₂). This process takes place in an electrolytic cell.
At the cathode (negative electrode), lithium ions (Li⁺) gain electrons (e⁻) to form lithium metal (Li).At the anode (positive electrode), chloride ions (Cl⁻) lose electrons to form chlorine gas (Cl₂).Overall reaction: 2LiCl(l) → 2Li(s) + Cl₂(g)
At the cathode: Li⁺ + e⁻ → Li(s)
At the anode: 2Cl⁻ → Cl₂(g) + 2e⁻
These reactions demonstrate the principle of electrochemistry where chemical energy is converted into electrical energy, and vice versa. The electrolysis of molten lithium chloride is an efficient way to produce pure lithium metal and chlorine gas, which have various applications in industries.
determine the molarity of a solution that has 0.267 mol of solute dissolved in 2.25 Liters of solution
Answer:
0.11866M
Explanation:
molarity is mol/L
0.267 mol/2.25L = 0.1186666...
round depending on how many digits you need
The Volume of a certain gas is 29.3 liters at STP. What would be the volume of the same gas at 1.39 atmospheres and -23.0oC? (R= 0.0821 L.atm/mol.k)
Answer:
V₂ =19.30 L
Explanation:
Given data:
Initial volume of gas = 29.3 L
Initial temperature = standard = 273 K
Initial pressure = standard = 1 atm
Final volume = ?
Final temperature = -23°C (-23+273 =250 K)
Final pressure = 1.39 atm
Solution:
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
Solution:
V₂ = P₁V₁ T₂/ T₁ P₂
V₂ = 1 atm × 29.3 L × 250 K / 273 K × 1.39 atm
V₂ = 7325 atm.L.K / 379.47 K.atm
V₂ =19.30 L
Answer this question in 2-3 sentences.
How is it possible that the water you are drinking today, is the same water the dinoaurs drank????
Answer ASAP
Extra Points!
Will mark brainiest
15L tank of gas is contained at a high pressure of 8.20 •10 ^4 torr. The tank is opened and the gas expands into an empty chamber with a volume of 6• 10^4 L
The question is incomplete. The complete question is:
15L tank of gas is contained at a high pressure of [tex]8.20\times 10^4 torr[/tex]. The tank is opened and the gas expands into an empty chamber with a volume of [tex]6\times 10^4 L. What is the final pressure if the temperature remains constant.
Answer: 20.5 torr
Explanation:
To calculate the new pressure, we use the equation given by Boyle's law. This law states that pressure is directly proportional to the volume of the gas at constant temperature.
The equation given by this law is:
[tex]P_1V_1=P_2V_2[/tex]
where,
[tex]P_1\text{ and }V_1[/tex] are initial pressure and volume.
[tex]P_2\text{ and }V_2[/tex] are final pressure and volume.
We are given:
[tex]P_1=8.20\times 10^4torr\\V_1=15L\\P_2=?\\V_2=6\times 10^4L[/tex]
Putting values in above equation, we get:
[tex]8.20\times 10^4\times 15L=P_2\times 6\times 10^4L\\\\P_2=20.5torr[/tex]
Thus new pressure will be [tex]20.5torr[/tex]
You’re at the zoo and have a big red 1.80 L helium balloon. The barometric pressure today is 785 mmHg. Then you hear the roar of a lion. Startled, you accidentally release the balloon. It flies away. By the time it reaches the clouds, the atmospheric pressure that high is only 3.00 atmospheres. What would the volume of the balloon up there? (Temperature is constant)
Answer:
0.62 L
Explanation:
Step 1:
Data obtained from the question.
Initial Volume (V1) = 1.80 L
Initial pressure (P1) = 785 mmHg
Final pressure (P2) = 3.00 atm
Final volume (V2) =?
Step 2:
Conversion of the pressure in mmHg to atm.
It is important to express the initial and the final pressure in the same unit. Either express both in atm or in mmHg. What ever the case is, we'll still arrive at same answer. Here, we shall be converting from mmHg to atm. This is illustrated below:
760mmHg = 1atm
Therefore, 785 mmHg = 785/760 = 1.03 atm
Step 3:
Determination of the final volume. This is illustrated below.
We shall be applying the Boyle's law equation since the temperature is constant.
P1V1 = P2V2
Initial Volume (V1) = 1.80 L
Initial pressure (P1) = 1.03 atm
Final pressure (P2) = 3.00 atm
Final volume (V2) =?
P1V1 = P2V2
1.03 x 1.8 = 3 x V2
Divide both side by 3
V2 = (1.03 x 1.8) /3
V2 = 0.62 L
Therefore, the new volume of the balloon is 0.62 L
Answer:
The volume of the balloon up there will be 0.618 L
Explanation:
Given:
V₁ = 1.8 L
P₁ = 785 mmHg = 1.03 atm
P₂ = 3 atm
Question: What would the volume of the balloon up there, V₂ = ?
According the ideal gas law:
PV = nRT
However, in this case, the number of moles of helium balloon is constant. The temperature will also be assumed to be constant. Therefore, the expression of the ideal gases is as follows:
P₁V₁ = P₂V₂
Solving for V₂
[tex]V_{2} =\frac{P_{1}V_{1} }{P_{2} } =\frac{1.03*1.8}{3} =0.618L[/tex]
What is the mass of solute in a 500 mL solution of 0.200 M
sodium phosphate (Na3PO4: M.W. 164.0)?
16.4 grams is the mass of solute in a 500 mL solution of 0.200 M .
sodium phosphate
Explanation:
Given data about sodium phosphate
atomic mass of Na3PO4 = 164 grams/mole
volume of the solution = 500 ml or 0.5 litres
molarity of sodium phosphate solution = 0.200 M
The formula for molarity will be used here to know the mass dissolved in the given volume of the solution:
The formula is
molarity = [tex]\frac{number of moles of solute}{volume in litres}[/tex]
putting the values in the equation, we get
molarity x volume = number of moles
0.200 X 0.5= number of moles
number of moles = 0.1 moles
Atomic mass x number of moles = mass
putting the values in the above equation
164 x 0.1 = 16.4 grams
16.4 grams of sodium phosphate is present in 0.5 L of the solution to make a 0.2 M solution.
The mass of solute in 500mL solution is 16.4 grams. The number of moles can be calculated by using Molarity formula to find Mass of the solute.
Given:
Atomic mass of Na3PO4 = 164 grams/mole
Volume of the solution = 500 ml or 0.5 litres
Molarity of sodium phosphate solution = 0.200 M
Calculation of Molarity:The formula for molarity will be used here to know the mass dissolved in the given volume of the solution:
Molarity = Number of solute / Volume of solution
Molarity * volume = number of moles
0.200 * 0.5= number of moles
Number of moles = 0.1 moles
Mass= Atomic mass * number of moles
On subsituting:
164 * 0.1 = 16.4 grams
16.4 grams of sodium phosphate is present in 0.5 L of the solution to make a 0.2 M solution.
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Dustin saw the following moon phase in the sky. What moon phase will he most likely see in 14 days? A. a first-quarter moon B. a new moon C. a last quarter moon D. a full moon Reset Submit
Answer: New Moon
Explanation: I Tried it on study island
Answer:
Answer: New Moon
Explanation:
Meteorologists in New York City are tracking a hurricane that is approaching the city. What type of instrument or system are these meteorologists most likely using?
a ground station
a weather buoy
a ship
a satellite
Molecules of two substances at the same temperature have the same:
A) average kinetic energy.
B) heat content.
C) distance between the molecules.
D) average potential energy.
Answer:
heat content
Explanation:
the kinetic energy , distance between molecules, and potential energy are all depending on the substance
C6H1206 +602 → 6002 + 6H20 AH = -2,799 kJ
How much energy is given off when 100.0 g of C6H1206 react?
Answer:
C^6 H^1206, 602,6002, 6H ^20, 2799 AHkJ, 100g C^6 H^1206
Explanation:
1- A gas occupies a volume of 4.0 L at 2.5 kPa. What volume will the gas occupy at 20.0 kPa?
I
Answer:
0.5 L
Explanation:
V1 (initial volume) = 4 L
P1 (initial pressure) = 2.5 kPa
P2 (final pressure) = 20 kPa
V2 (final volume) = ?
Use Boyle's law P1V1 = P2V2, to find the the final volume
P1V1 = P2V2
2.5 x 4 = 20 x V2
Divide both side by 20
V2 = (2.5 x 4)/20
V2 = 0.5 L
Answer: 0.5L
Explanation:
Using Boyle's law
P1V1=P2V2
P1= 2.5kpa
V1= 4l
V2= ?
P2= 20.0kpa
Substitute the value into this formula
P1V1=P2V2
2.5×4=20×V2
Cross multiply
2.5×4=20V2
V2= 2.5×4/20
V2= 80/2.5
V2= 0.5L
So 0.5L of gas will occupy 20.0kpa
The number 40 in the name calcium-40 represents
A. the atomic number
B. the number of protons in the atom
C. the sum of the protons and neutrons
D. none of these
Answer:
A. the atomic number
Explanation:
It is a member of the alkaline earth family of metals with the atomic symbol Ca, atomic number 20, and atomic weight 40. Calcium is the most abundant mineral in the body and combines with phosphorus to form calcium phosphate in the bones and teeth.