Answer:
6 (STI, SIT, TIS, ITS, IST
A 80.0 g sample of copper (specific heat = 0.20 J/g °C ) is heated and then added to 100 g water at 22.3 °C. The final temperature of the water and copper is 26.9°C. What is the original temperature of the copper sample, assuming that all the heat lost by the copper is gained by the water
The original temperature of the copper is 145.4 °C
What is temperature?Temperature refers to the degree of hotness or coldness of a body. Now we know that the heat lost by the copper is equal to the heat gained by the water. The heat lost is negative while the heat gained is positive.
Hence;
-(mcdT)= mcdT
-(80.0 * 0.20 ( 26.9 - T)) = 100 * 4.12 * (26.9 - 22.3 )
-(430.4 - 16T) = 100 * 4.12 * (26.9 - 22.3 )
-430.4 + 16T = 1895.2
T = 1895.2 + 430.4 /16
T = 145.4 °C
The temperature of the copper is 145.4 °C.
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There are 1.00 mol each of H2 and I2 in a 2.00 L flask. The Kc for this reaction is 55.3. Determine the equilibrium concentrations of all chemical species at room temperature.
The equilibrium concentrations of all chemical species at room temperature are given below.
[H2] = 0.212M[I2] = 0.212M[HI] = 1.576MH2(g) + I2(g) <-----> 2HI(g)
I 1 1 0
c -x -x 2x
E 1-x 1-x 2x
[H2] ⇒ 1-x/1 = 1-x
[I2] ⇒ 1-x/1 = 1-x
[HI] ⇒ 2x
Kc = [HI]^2/[H2][I2]
55.3 = (2x)^2/(1-x)(1-x)
55.3 = (2x/1-x)^2
7.44 = 2x/1-x
7.44*(1-x) = 2x
x = 0.788
[H2] ⇒ 1-x = 1-0.788 = 0.212M
[I2] ⇒ 1-x = 1-0.788 = 0.212M
[HI] ⇒ 2x = 2*0.788 = 1.576M
In a chemical reaction, while each reactant and the products are in a concentration that does not alternate with time any extra, it is said to be in a state of chemical equilibrium. in this kingdom, the price of forwarding response is the same as the rate of backward response.
Equilibrium is whilst the fee of the ahead reaction equals the charge of the opposite reaction. All reactant and product concentrations are consistent at equilibrium.
We are saying that a chemical is in an equilibrium concentration while the products and reactants do not change as time moves on. In different words, chemical equilibrium or equilibrium awareness is a state when the price of an ahead reaction in a chemical response will become equal to the rate of a backward response.
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The equilibrium concentrations of all chemical species at room temperature are given below.
[H2] = 0.212M
[I2] = 0.212M
[HI] = 1.576M
H2(g) + I2(g) <-----> 2HI(g)
I 1 1 0
c -x -x 2x
E 1-x 1-x 2x
[H2] ⇒ 1-x/1 = 1-x
[I2] ⇒ 1-x/1 = 1-x
[HI] ⇒ 2x
Kc = [HI]^2/[H2][I2]
55.3 = (2x)^2/(1-x)(1-x)
55.3 = (2x/1-x)^2
7.44 = 2x/1-x
7.44*(1-x) = 2x
x = 0.788
[H2] ⇒ 1-x = 1-0.788 = 0.212M
[I2] ⇒ 1-x = 1-0.788 = 0.212M
[HI] ⇒ 2x = 2*0.788 = 1.576M
In a chemical reaction, while each reactant and the products are in a concentration that does not alternate with time any extra, it is said to be in a state of chemical equilibrium. in this kingdom, the price of forwarding response is the same as the rate of backward response.
Equilibrium is whilst the fee of the ahead reaction equals the charge of the opposite reaction. All reactant and product concentrations are consistent at equilibrium.
We are saying that a chemical is in an equilibrium concentration while the products and reactants do not change as time moves on. In different words, chemical equilibrium or equilibrium awareness is a state when the price of an ahead reaction in a chemical response will become equal to the rate of a backward response.
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Activation energy is: A. The maximum amount of energy reactants can hold. B. The energy needed to begin breaking the bonds of products. C. None of these. D. The energy needed to begin breaking the bonds of reactants.
Activation energy is the energy needed to begin breaking the bonds of reactants and is denoted as option D.
What is a Reactant?These are the substances which take part in a chemical reaction and result in the formation of the product.
The activation energy is required as it breaks the bonds of the reactant thereby resulting in the product being formed. This therefore makes it the most appropriate choice.
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alue: 4 Why did Joseph Stalin not allow elections in the nations the Soviets occupied with their troops after World War II? a. He knew that these nations would not want a foreign ruler. O b. He knew these nations would be anti-Soviet since they had waged war in these nations. O c. He knew these nations would elect leaders who would try to go back to war with the Soviet Union. Od. He knew that communist members in his nation would not like elections. =/4 Prev Next >
Joseph Stalin didn't allow elections in the nations the Soviets occupied with their troops after World War II because: option B.
What is the Cold War?The Cold War was a period of open and intense conflict between the United States of America and the Soviet Union that developed almost immediately after World War II (Second World War).
Also, the Cold War officially started on the 12th of March, 1947 and came to an end on the 3rd of December, 1989.
Based on historical information and records, we can reasonably infer that Joseph Stalin didn't allow elections in the nations the Soviets occupied with their troops after World War II because he knew these nations would be anti-Soviet since they had waged war in these nations.
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Lina has worked hard to gather data for her experiments. With her last set of data she received, she is ready to publish her paper in
a peer-reviewed journal. In order to do that, she has to make sure that all of her data has consistent SI units, significant figures and
in scientific notation if necessary. Help Jessica get all of her data in order. How many significant figures are in 43.8lbs?
43.8 has 3 significant figures and 1 decimal.
What are significant figures?The term significant figures refer to the number of important single digits (0 through 9 inclusive) in the coefficient of an expression in scientific notation.
All zeros that occur between any two non-zero digits are significant. For example, 108.0097 contains seven significant digits. All zeros that are on the right of a decimal point and also to the left of a non-zero digit are never significant. For example, 0.00798 contained three significant digits.
Hence, 43.8 has 3 significant figures and 1 decimal.
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can you help me please
Answer:
A. Non-metal
B. Six
C. 2
D.NA2O
E.Oxygen
Explanation:
Oxygen is the element in the second period (second horizontal row) and Group VI A of the periodic table. These properties apply to oxygen
How is a compound different than a
mixture?
a. A compound can be separated by physical
means.
b. A mixture can be separated by physical
means.
c. A mixture is made of only one type of atom.
d. A compound is made of only one type of
atom
Answer:
B.) A mixture can be separated by physical means.
Explanation:
While it may be difficult, mixtures can be separated back into their original elements/compounds. Compounds cannot be separated because their original elements/compounds bond together to form the new compound. The only way to separate compounds is through chemical (or drastic physical) means.
Consider a rigid, thick-walled tube that is fi lled with H2O liquid and vapor at 0.1 MPa. After it is sealed, it is heated so that it passes through its critical point. What fraction of the mass in the tube is liquid
The fraction of the mass in the tube is liquid is mathematically given as
kg =0.99876 kg liquid/kg
What fraction of the mass in the tube is liquid?
Generally, the critical volume is mathematically given as
Vc=0.0560* 1/18
Vc=0.00311m3/g
at state 1, at saturated condition having volume 0.003111 m3/kg
for 0.1mpa
V1=0.00104KJ/kg
Vg=1.6720KJ/kg
Hence, the quality of the vapor-liquid mixture is
Q=[tex]\frac{0.00311-0.001043}{1.6720 - 0.001043}[/tex]
Q=0.001237kgv/kgm
Mass fraction of liquid present = (1-x)
M=(1-x)
Hence
M=(1-0.001237)
kg =0.99876 kg liquid/kg
In conclusion, a fraction of the mass in the tube is liquid
kg =0.99876 kg liquid/kg
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What is the molar mass of cholesterol if 0.00105 mol weigh 0.406 g?
Answer:
387 g/mol
Explanation:
The molar mass is a ratio comparing a substance's mass and molar value. The specific ratio looks like this:
Molar Mass (g/mol) = mass (g) / moles
You can plug the given values into the ratio to find the molar mass.
Molar Mass = mass / moles
Molar Mass = 0.406 g / 0.00105 mol
Molar Mass = 387 g/mol
Describe the type of force which exists between particles in an ideal gas.
A. There are strong attractive and repulsive forces between gas particles.
B. There are no attractive or repulsive forces between gas particles.
C. There are only attractive forces between gas particles.
D. There are only repulsive forces between gas particles.
The force that exists between particles in an ideal gas are no attractive or repulsive forces between gas particles.
What is an ideal gas?An ideal gas is a gas that obeys the ideal gas law. Ideal gases do not liquify at normal temperature and pressure since the gases do not interact.
Hence, the force that exists between particles in an ideal gas are no attractive or repulsive forces between gas particles.
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ure and
mical
ations
3
3
Posttest
Mole
ulation
Formulas
What happens when hydrogen and oxygen react?
OHydrochloric acid is produced.
Water is produced.
O Sulfuric acid is produced.
No product is formed.
The answer is Water is produced.
Which factor does not increase the rate of a reaction? decreasing the concentration of the reactants increasing the temperature of the system increasing the surface area of the reactants adding an effective catalyst to the system
Rate of Reaction:
The factor that does not increase the rate of a reaction is "decreasing the concentration of the reactants".
Factors that increase the rate of a reaction:
Increasing the temperature of the system: The average kinetic energy of the reactant molecules will rise as the temperature rises. As a result, a higher percentage of molecules will possess the minimal amount of energy required for an efficient collision, increasing the rate of reactions.Increasing the surface area of the reactants: More particles are exposed to the other reactant when the surface area of a reactant is increased. Particles collide more frequently, increasing the number of successful collisions per second. Thus increasing the rate of reaction.Adding an effective catalyst to the system: A catalyst is a substance that participates in a reaction without being absorbed, speeding up the process. An additional reaction pathway to produce compounds is offered by catalysts.
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Compared to water, the pH of a buffer solution ____________ when the same small amount of a strong acid (such as HCl) or strong base (such as NaOH) is added to both.
Compared to water, the pH of a buffer solution resist changes when the same small amount of a strong acid (such as HCl) or strong base (such as NaOH) is added to both.
What is buffer solution?A buffer solution, also known as a buffer, is a mixture of a weak acid and its conjugate base (or a mixture of a weak base and its conjugate acid). When a weak acid or a weak base is applied in modest amounts, buffer solutions withstand the pH shift.
The conjugate base of the buffer system reacts with a small amount of strong acid to change it into the weak acid of the buffer system. The pH then just slightly declines, the weak acid concentration rises, and the conjugate base concentration falls.
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A 55.0 kg sample of an unknown metal C requires 675kj of energy to heat it from 25.0 to 118.0C. Okie hat is the specific best of the unknown metal?
Answer:
See below
Explanation:
Specific heat is 'c'
Q = m c T where T i s change in temp
675 = 55 c (118-25)
c = .13196 kJ / kg-C ...I do not know what units you want....
this is also .13196 J/gm-C
What mass of carbon dioxide is produced upon the complete combustion of 17.0 LL of propane (the approximate contents of one 5-gallon tank)
The mass of carbon dioxide that is produced will be 31,671 grams or 31.671 kg
Stoichiometric calculationsFirst, the equation of the reaction:
[tex]C_3H_8(g)+5O_2(g)-- > 3CO_2(g)+4H_2O(g)[/tex]
The mole ratio of propane burned to carbon dioxide produced is 1:3.
The density of propane gas is 0.621 g/mL, thus, 17.0 L of propane will weigh:
Density = mass/volume, mass = 0.621 g/mL x 17000 = 10,557 g
Mole of 10,557 g of propane = 10557/44.1 = 239.39 moles
Equivalent mole of carbon dioxide produced = 239.39 x 3 = 718.16 moles
Mass of 718.16 moles carbon dioxide = 718.16 x 44.1 = 31,671 grams or 31.671 kg
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What is the molarity of a solution where 36.1 grams of potassium permanganate is dissolved in enough water to make 0.566 L of solution
0.4 M is the molarity of the solution.
The molarity of solution can be calculated by : [tex]C_M[/tex] = [tex]n/V[/tex] where,
n is the no. of moles of solute([tex]KMNO_4[/tex]) and
[tex]V[/tex] is the volume of the solution in L.
Now,
No. of moles can be calculated by: Given mass/ Molar mass
Molar mass of [tex]KMNO_4[/tex] is 158.034 g/mole
No. of moles of [tex]KMNO_4[/tex] = 36.1 g / 158.034 g/mole = 0.228 (app.) moles
Molarity of solution = 0.228 moles /0.566 L = 0.4 mol/L or 0.4 M
Hence, the molarity of a solution where 36.1 grams of potassium permanganate is dissolved in enough water to make 0.566 L of solution is 0.4 M
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What is h called in the equation e - tha ?
o a. planck's constant
o b. einstein's constant
o c. the em constant
o d. the speed of light
Planck's constant symbolized (h) relates the energy in one quantum (photon) of electromagnetic radiation to the frequency of that radiation.
What is Planck's constant ?The equation, E=hf, is referred to as the Planck relation or the Planck-Einstein relation. The letter h is named after Planck, as Planck's constant.
The letter h is named after Planck, as Planck's constant. Energy (E) is related to this constant h, and to the frequency (f) of the electromagnetic wave.Planck’s constant, (symbol h), fundamental physical constant characteristic of the mathematical formulations of quantum mechanics, which describes the behaviour of particles and waves on the atomic scale, including the particle aspect of light. it's value is Plank's constant (h=6.626×10^-34 J s).Learn more about Planck's constant here:
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Who arranged the elements into the first periodic table?
Answer:
Chemist Dmitri Mendeleev
Q1. What are decomposition reactions? Explain with the help of a balanced chemical equation. (2 marks)
Q2. Draw the structure of a nephron and label the following on it- Glomerulus, Bowman’s capsule, Renal artery and Collecting duct. (2 marks)
Q3. What happens when zinc metal reacts with sulphuric acid? Write the chemical equation involved in this reaction. (2 marks)
Q4. Draw ray diagrams showing the image formation by a convex lens when an object is placed (2 marks)
(a) between optical centre and focus of the lens
(b) between focus and twice the focal length of the lens
Q5. Sunita and her mother had an appointment with an optician. Optician prescribed corrective lenses to Sunita having a power equal to + 5.0 D. The lens prescribed to
her mother has power equal to – 2.5 D. (3 marks)
(a) What is the focal length of the lens prescribed to Sunita?
(b) Which type of spherical lens is prescribed to Sunita’s mother?
(c) What is the power of the combination of the two lenses (if placed in contact), prescribed to Sunita and her mother?
Q6. Give the reason for the following: (3 marks)
(a) The taste and smell of chips change when the packet is left open for a few days.
(b) Magnesium ribbon is cleaned before burning in air.
(c) Iron articles get coated with reddish brown powder when left for sometime.
Q7. (a) Why do arteries have thick and elastic walls while veins have thin walls? (2 marks)
(b) What is the role of valves in the heart? (1 mark)
pls help me someone
Decomposition reaction represents the breakdown of single compound into more products.
What are decomposition reactions?A decomposition reaction is a type of reaction in which one reactant breaks down into two or more products. This can be represented by the general equation: H2O2 → 2H + 2O. In this example the breakdown of hydrogen peroxide occurs and water and oxygen are formed.
What happens when zinc metal reacts with sulphuric acid?Zinc reacts with dilute sulphuric acid to form zinc sulphate and hydrogen This hydrogen goes up into the atmosphere whereas the zinc sulphate remains.
Why should a magnesium ribbon be cleaned before burning in air?Magnesium ribbon should be cleaned before burning in air because Magnesium metal combines with oxygen to form Magnesium Oxide (MgO) layer, which is a very stable molecule.
Why arteries have thick, elastic walls, while veins have thin walls?Arteries have thick, elastic walls, while veins have thin walls because arteries are under more pressure, as compared to veins that are under less pressure. Arteries are big in size whereas veins are small.
What is the role of valves in the heart?The role of valves in the heart is that these valves prevent the backward flow of blood.
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When balancing a chemical equation, the subscripts on the individual
chemical formulas can be changed.
True
False
Answer:
False
Explanation:
The subscripts of chemicals can't be changed in a chemical reaction, otherwise the products or the reactants would be a completely different molecule. We can't just change O2 to being O3, but we can change O2 into 3/2 O2 (in some cases)
How many groups are in the modern periodic table?
Answer:
there are 18 groups
Explanation:
Answer:
IA....... VIIIA. main groups (A groups)
IB....... VIIIB. sub groups (B groups)
totally they are 18
1. The spontaneous disintegration of a nucleus into a a slightly lighter and more ________ nucleus, accompanied by emission of particles, electromagnetic radiation, or both
The spontaneous disintegration of a nucleus into a slightly lighter and more radioactive nucleus is accompanied by the emission of particles, electromagnetic radiation, or both.
Radioactivity is the phenomenon of the spontaneous disintegration of unstable atomic nuclei into atomic nuclei to shape greater energetically strong atomic nuclei.
Radioactive decay is a tremendously exoergic, statistically random, first-order system that occurs with a small amount of mass being converted to strength.
Spontaneous disintegration of a radionuclide with the emission of lively particles or radiation, consisting of alpha or beta debris or gamma rays.
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Question 4 of 10
A new type of technology that uses stem cells to grow body parts is called
what?
OA. Organ engineering
OB. Passive prosthetics
OC. Tissue engineering
OD. Stem cell scaffolding
SUBMIT
Help!!
Answer:
A new type of technology that uses stem cells to grow body parts is called stem cell scaffolding.
Explanation:
"In stem cell transplants, stem cells replace cells damaged by chemotherapy or disease or serve as a way for the donor's immune system to fight some types of cancer and blood-related diseases, such as leukemia, lymphoma, neuroblastoma, and multiple myeloma. These transplants use adult stem cells or umbilical cord blood." - Mayo Clinic
Radiation
Project: Solar Cooker
In the solar cooker, reflective material like aluminum is used to collect and trap the heat from the sunlight while the interior is painted to reduce heat loss.
What is a solar cooker?A solar cooker is a cooker which uses the energy of sunlight to cook food.
In designing a solar cooker, a solar collector such as reflective material like aluminum is used to collect and trap the heat from the sunlight.
The interior of the cooker is painted black to avoid heat loss by radiation.
Cardboard boxes are used as insulating materials.
In conclusion, a solar cooker is designed to maximize solar energy collected and minimize heat loss.
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4. A weather balloon containing 35.0 L of helium at 98.0 kPa is released and rises.
Assuming that the temperature is constant, fine the volume of the balloon when the
atmospheric pressure is 25.0 kPa at a height of about 25 km.
Answer:
137.2 L
Explanation:
p1v1 = p2v2
p1v1 / p2 = v2
98 * 35 / 25 = v2 = 137.2 L
To find the volume of the balloon when the atmospheric pressure is 25.0 kPa at a height of about 25 km, we can use Boyle's Law,as per which volume is 137.2 L.
Boyle's law is an experimental gas law which describes how the pressure of the gas decreases as the volume increases. It's statement can be stated as, the absolute pressure which is exerted by a given mass of an ideal gas is inversely proportional to its volume provided temperature and amount of gas remains unchanged.
Boyle's Law equation: P₁ V₁ = P₂ V₂
Given:
P₁= 98.0 kPa (initial pressure of the balloon)
V₁ = 35.0 L (initial volume of the balloon)
P₂ = 25.0 kPa (final atmospheric pressure)
V₂= unknown (final volume of the balloon)
Plugging in the values into Boyle's Law equation, we have:
98.0 kPa × 35.0 L = 25.0 kPa × V₂
To find V₂, we can rearrange the equation:
V₂ = [tex]\dfrac{98}{35}\times{25}\\=137.2 \ L.[/tex]
Therefore, the volume of the balloon when the atmospheric pressure is 25.0 kPa at a height of about 25 km is approximately 137.2 L.
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If the system 3H2(g) N2(g) 2NH3(g) is at equilibrium and more N2 is added, a net reaction that consumes some of the added N2 will occur until a new equilibrium is reached. Group startsTrue or False
Group Starts True
A rightward change in equilibrium.
The concentration of gases = [H2] will decrease, [N2] will increase, [NH3] will increase when the new equilibrium is reached.
Additional heat is produced.
The forward and backward reactions' rates quicken in the new equilibrium.
The equilibrium constant decreases as more heat is released.
the exothermic nature of the process.
The equilibrium constant would not have changed if the temperature had remained constant.
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A synthesis reaction takes place when carbon monoxide (CO) and hydrogen gas (H2) react to form methanol (CH3OH). How many grams of methanol are produced when 14 grams of carbon monoxide reacts with 1.5 grams of hydrogen gas
12 g CH3OH are produced when 14 grams of carbon monoxide reacts with 1.5 grams of hydrogen gas.
Writing the balanced equation for the reaction taking place:
CO(g) + 2H2(g) ⇒ CH3OH
Finding the limiting reactant:
moles CO present ⇒ 14 g x 1 mol CO / 28 g = 0.5 moles CO
moles H2 present ⇒ 1.5 g x 2 mol H2 / 2 g = 0.75 moles H2O
Because according to the balanced equation it takes 2 moles of H2 for every 1 mole CO, there isn't enough H2, so it is limiting and will dictate how much CH3OH can be made.
Mass of CH3OH produced
= 0.75 moles H2 x 1 mol CH3OH / 2 mol H2 x 32 g CH3OH / mol
= 12 g CH3OH
A synthesis response is a sort of reaction in which a couple of reactants combine to form a single product. it's a kind of chemical reaction wherein two or extra simple materials combine to shape a more complicated product.
it is surely a matter of creating connections or placing things collectively. We synthesize statistics evidently to help others see the connections between things. For example, whilst you document to a pal the matters that numerous other pals have said approximately a tune or movie, you're carrying out a synthesis.
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/Why does an atom want all of it’s orbitals filled
Why does it want to be in a stable state
Using chemical equations, show how the triprotic acid h3po4 ionizes in water. Phases are optional.
The acid that contains three hydrogen ions are called triprotic acid.
The triprotic acid h3po4 ionizes in water:White solid pure anhydrous phosphoric acid melts into a viscous liquid at 42.35 degrees Celsius. Phosphoric acid, which contains three ion hydrogen atoms, acts as a triprotic acid in an aqueous solution. The hydrogen ions disappear one at a time.
H₃PO₄ (aq) ⇄ H⁺ (aq) + H₂PO₄⁻ (aq) Kₐ₁ = 7.5 × 10⁻³
H₂PO₄⁻ (aq) ⇄ H⁺ (aq) + H₂PO₄²⁻ (aq) Kₐ₂ = 6.2 × 10⁻³
HPO₄²⁻ (aq) ⇄ H⁺ (aq) + PO₄³⁻ (aq) Kₐ₃ = 7.5 × 10⁻³
The first dissociation constant of phosphoric acid indicates that it is not an especially potent acid. It is a weaker acid than hydrochloric acid and sulfuric acid, but stronger than acetic acid. The ease with which each subsequent dissociation stage happens decreases. As a result, H₂PO₄⁻ is a relatively weak acid but HPO₄²⁻ is an extremely weak acid.
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what is the formal charge of the central nitrogen atom in the best lewis structure dinitrogen sulfide
The formal charge of the nitrogen atom present at the center in dinitrogen sulfide is +1.
Formal charge:
The formal charge relates the presence of electrons on the atom when it is not present in a molecule and when it present in a molecule.
Lewis structure:
The structural representation of a compound by showing the electrons present around the atom with dots is called the Lewis dot structure.
The three possible Lewis structures of dinitrogen sulfide are shown below.
However, the best Lewis structure among those is first one. The central nitrogen atom is carrying a positive charge while the sulfur atom has a negative charge. The charges on these atoms are most stable thereby making the compound stable.
Therefore, the formal charge on the central nitrogen atom is +1.
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