The half-life of a radioactive element is 8 years, the percentage of the original sample would be left after 32 years is 6.25%
What is half life ?
The amount of time it takes for a radioactive element to decay to half its original value is known as its half life. The time it takes for a source's activity to decrease to half its initial value is implied by this to be the definition of a half life.
Let us consider half life as t1/2=8years t=32 years
∴ n=t/t1/2 =4 years
Amount of remaining radioactive element, R=Ro/2n
Therefore R/Ro=1/ 2^4 = 0.0625
Percentage of original sample remained, RoR×100=6.25%
Therefore half-life of a radioactive element is 8 years, the percentage of the original sample would be left after 32 years is 6.25%
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why is it important different types of chemical reactions (i.e acid-base, precipitation, and oxidation-reduction reactions)?
Precipitation, acid-base, and oxidation-reduction reactions are the three most common types of chemical reactions.
When dissolved substances react, one (or more) solid products are produced, which is known as Precipitation reaction. These kinds of reactions, which are also occasionally known as double displacement, double replacement, or metathesis reactions, frequently involve the exchange of ions between ionic compounds in aqueous solutions. These interactions, which occur frequently in nature, are what cause kidney stones in mammals and coral reefs to grow in ocean waters. They are extensively utilized in industry to produce a variety of common and specialized compounds. Many chemical analysis procedures, such as gravimetric methods for figuring out the composition of matter and spot tests used to identify metal ions, heavily rely on precipitation reactions as well. This is called Precipitation reaction.
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write the half reactions and overall reaction for the zn/ zn2 // cu2 / cu cell and calculate the cell potential from the standard reduction potentials
The cell potential of the Zn/Zn2+//Cu2+/Cu cell is +1.10 V.
What is cell potential?
Just two examples as to how chemical reactions generate power through the movement of electrons are the batteries throughout your remote control and the engine throughout your car. The voltage that exists between a battery's two half cells can be measured using the cell potential. We will describe how to do this and what elements make it possible for us to determine the voltage that is present inside an electrochemical cell. The potential difference between the two half cells inside an electrochemical cell is measured by the cell potential, or Ecell. The ability of electron density to move from one half cell to another is what determines the potential difference. Due to the fact that the chemical reaction is just a redox reaction, electrons can move between the electrodes.
The half reactions for the Zn/Zn2+//Cu2+/Cu cell are:
Oxidation: Zn → Zn2+ + 2e-
Reduction: Cu2+ + 2e- → Cu
The overall reaction is:
Zn + Cu2+ → Zn2+ + Cu
The cell potential can be calculated from the standard reduction potentials of the two half reactions:
Ecell = Ereduction - Eoxidation
Ecell = (Ereduction for Cu2+ + 2e- → Cu) - (Eoxidation for Zn → Zn2+ + 2e-)
Ecell = + 0.34 V - (-0.76 V)
Ecell = + 1.10 V
This means that the cell potential of the Zn/Zn2+//Cu2+/Cu cell is +1.10 V.
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a firm runs its technology operations on a fleet of amazon ec2 instances. the firm needs a certain software to be available on the instances to support their daily workflows. the developer team has been told to use the user data feature of ec2 instances.
User Data is generally used to perform common automated configuration tasks and even run scripts after the instance starts. When you launch an instance in Amazon EC2, you can pass two types of user data - shell scripts and cloud-init directives. You can also pass this data into the launch wizard as plain text or as a file.
In general, a configuration is the arrangement of the components that make up a whole, or the act of creating that arrangement. A configuration, or particular shape, is produced when objects are placed in any spatial arrangement. As an illustration, scientists refer to a configuration as the particular, bound arrangement of atoms that forms a molecule.
Text, observations, figures, photos, numbers, graphs, and symbols can all be used as forms of data. Individual prices, weights, addresses, ages, names, temperatures, dates, or distances, for instance, could be included in the data. Data is an unprocessed type of knowledge and has no meaning or use by itself.
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Which of the following best represents the transition state of the rate-determining step for the given reaction?
The transition state is only present when the reaction's potential energy is at its greatest. It is quite unstable for the species in the transition state.
The meaning of a transitionThe term is derived from the Latin word "transire," which meaning to cross. It frequently describes the action rather than the outcome. Thus, "transitioning" is the process of changing, of moving from one set of traits or circumstances to another.
What makes a good sentence for a transition?An excellent transition sentence might contain a word or phrase like although, despite this/that, in comparison, or yet if you needed to convey a point that contradicted your prior assertion.
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how is the number of molecular orbitals approximated by a linear combination of atomic orbitals related to the number of atomic orbitals used in proximation
In quantum chemistry, Linear Combination of Atomic Orbitals or LCAO is a superposition or mixing of atomic orbitals and a technique used for calculating molecular orbitals.
By Linear Combination of Atomic Orbitals , we can predict which atomic orbitals can mix to form a molecular orbital on the basis of orbital symmetry. We can also predict the number of molecular orbitals that can be produced from the interaction between two atomic orbitals.
By LCAO, the position of electrons can be determined. If can electron is found in an atomic orbital say "A" and also in atomic orbital say B". Then the superposition of the two atomic orbitals A and B will give the overall wave function. It is represented by ψ.
ψ± = N(A ± B)
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if a 1.00 ml sample of the reaction mixture for the equilibrium constant experiment required 32.40 ml of 0.258 m naoh to titrate it, what is the monoprotic acetic acid concentration in the mixture? select one: 0.399 m 5.82 m 8.36 m 7.96 m 12.6 m
The mixture contains a concentration of monoprotic acetic acid of
(8.36 M). (0.0083592 mol/1000 mL = 8.36 M) = 0.258 M x 32.40 mL/1000 L.
What is an example of monoprotic acid?Monoprotic acids include benzoic acid (C6H5CO2H), acetic acid (CH3CO2H or HOAc), nitric acid (HNO3), and hydrochloric acid (HCl).
What strength of acid is monoprotic acid?H2SO4 and H3PO4 are examples of polyprotic acids that contain two or three hydrogen ions. Although it is alluring to believe that polyprotic acids are more powerful than monoprotic acids since they include several hydrogen ions, this is not the case.
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write the balanced reaction for the combustion of hexanol, ch3ch2ch2ch2ch2ch2oh? (be sure to use whole number coefficients.)
The balanced reaction for the combustion of hexanol is:
2C₆H₁₄(g)+19O₂(g)→12CO₂(g)+14H₂O(g) 2 C ₆ H 14 ( g ) + 19O₂ ( g ) → 12CO₂ ( g ) + 14 H₂O ( g )
What is balanced reaction?
An equation for a chemical reaction is said to be balanced if both the reactants and the products have the same total charge and the same number of atoms for each component of the reaction. In other words, the reaction has equal amounts of mass and charge on both sides.
For instance, think about the response: O2 (g) + 2Mg(s) = 2MgO (g) Two magnesium and two oxygen atoms are present on the reactant and product sides of this reaction. The chemical reaction is a balanced chemical equation because it follows the law of conservation of mass.
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a chemical reaction happens in three steps. step 1:step 2:step 3:a→b cc→d ed a→f(fast)(slow)(fast)step 1:a→b c(fast)step 2:c→d e(slow)step 3:d a→f(fast) what is the rate-determining step
Answer:
Step 2 only
Explanation:
what volume (ml) of 7.48 × 10-2 m phosphoric acid can be neutralized with 115 ml of 0.244 m sodium hydroxide?
Volume of the original phosphoric acid solution is 375.133 ml.
What is phosphoric acid?
Phosphoric acid, also known as orthophosphoric acid, monophosphoric acid, or phosphoric(V) acid, is an inorganic solid with the chemical formula H3PO4 that contains phosphorus. It is frequently found as an 85% aqueous solution, that is a syrupy liquid that is colourless, odourless, and non-volatile. It is a significant industrial chemical that is used in numerous fertilisers. This substance is an acid. The phosphate ion PO 3 4 is produced when all three H+ ions are removed. Dihydrogen phosphate ion H2PO 4 and hydrogen phosphate ion HPO24 are produced, respectively, by removing one or two protons. Organophosphates are esters created by phosphoric acid.
Here, we have given two solution with their conc. and volume .
So, formula used to calculate volume is:
M1V1 = M2V2
let, M1 = molarity of phosphoric acid
V1 = volume of phosphoric acid used
M2 = molarity of NaOH
V2 = volume of NaOH used
Now,
7.48 X 10-2 X V1 = 0.244 x 115
V1 = 0.244 x 115/ 7.48 X 10-2
V1 = 375.133 ml.
Hence, the volume of phosphoric acid is 375.133 ml.
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what term is used to describe the thick mixture of liquid and solid used to form the chromatography column?
Thick liquid layer that interacts with an inert carrier gas or mobile phase and is chemically linked to the inside of a capillary column
What is a chromatographic example?
Chromatography Methods
Some forms of liquid chromatography include high-performance liquid chromatography (HPLC), size exclusion chromatography, and supercritical fluid chromatography. Ion-exchange, resin, and paper chromatography are a few other varieties of chromatography.
What is the chromatography's fundamental tenet?
Chromatography is one more method for separating and analyzing chemical mixtures. The method is based on the interaction of polarity between the sample and two additional components, the solid (or stationary) phase, and the mobile phase, which can be either a liquid or a gas.
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if a chemical reaction produces hydroxide ion, oh- , what would be the range for the target ph of a buffer solution that would favor ph stabilization under these conditions? explain your answer
The range for the target ph of a buffer solution that would favours ph stabilization unders this condition in (4.75-4.85).
What is Henderson Hasselback equation ?
The Henderson-Hasselbalch equation, pH = pKa + log([A]/[HA]), can be used to determine the pH of a buffer. The terms "HA" and "A" in this equation stand for the equilibrium concentrations of the conjugate acid-base pair that were employed to make the buffer solution.
What is acetate?
A proton is taken out of the carboxy group of acetic acid to produce acetate, a monocarboxylic acid anion. It performs a function as a Saccharomyces cerevisiae metabolite as well as a human metabolite. The base is a conjugate of an acetic acid. ChEBI. Alternatives to ACETIC ACID
The Henderson Hasselback equation for a suitable acetic acid / acetate buffer-
Ph= Pka + log (salt)/(acid)
(salt) = (acetate)
(acid) = (acetic acid)
now, CH3 COOH dissociates as
CH3COOH ⇔ CH3COOH +H
Pka for CH3COOH = 4.75
If a chemical reaction produced hydroxide ions, then CH3COOH gets consumed and more acetate ions with produces. This leads to change in Ph of the solution as due (CH3C00H-) increases the ph absence increases.
The range for the target ph of a buffer solution that would favours ph stabilization unders this condition in (4.75-4.85)
The buffer capacity is the ability of a given buffer to resist any changes in ph when small amount of acid or base added to it.The buffer capacity of a mixed weak acid( here Acetic acid)-base (NaOH) buffer is much greater when the individual pKa values are in close proximity with each other.
Therefore, The range for the target ph of a buffer solution that would favours ph stabilization unders this condition in (4.75-4.85).
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What is the molecular formula for a compound that is 24.82% nitrogen, 49.87% oxygen, and
25.31% fluorine and has a molar mass of 450.08g?
Molecular formula is n times the empirical formula, where n is integers 1,2,... The empirical formula is F[tex]_3[/tex]N[tex]_4[/tex]O[tex]_7[/tex]. Therefore, the molecular formula of the given compound is F[tex]_6[/tex]N[tex]_8[/tex]O[tex]_{14}[/tex].
What is molecular formula?
Molecular formula is a chemical formula for a compound existing as discrete molecules that gives the total number of atoms of each element in a molecule.
Number of gram atoms in compound and Divide by smallest Number of gram atoms in compound
F=(25.31%)÷18=1.40÷1.40=3
N=(24.82%)÷14=1.77÷1.40=4
O=(49.87%)÷16=3.11÷1.40=7
The atomic ratio is 1:1.21:2.2
Whole number is 1:1:2
Empirical formula corresponding to this whole number is F[tex]_3[/tex]N[tex]_4[/tex]O[tex]_7[/tex].
molecular formula mass= n ×empirical formula mass
450.08g= n ×225.04
n= 2
molecular formula= F[tex]_6[/tex]N[tex]_8[/tex]O[tex]_{14}[/tex]
Therefore, the molecular formula of the given compound is F[tex]_6[/tex]N[tex]_8[/tex]O[tex]_{14}[/tex].
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when gas molecules collide (for example molecules of o2 or n2 in the air), why don't they stick together?
when gas molecules collide (for example molecules of o2 or n2 in the air), they don't stick together due to their high thermal energy.
Why are collisions between gas molecules said to be elastic?Because gas molecules are so small, the kinetic theory of gases assumes that every collision between them will be fully elastic. The energy and momenta of the molecules are conserved during collisions if the molecules are small. As a result, regardless of accidents, the temperature does not change.
What is an elastic collision between gas particles according to the kinetic theory?Any collision in which there is no overall kinetic energy loss is said to be elastic. During an elastic collision, kinetic energy may be transmitted from one particle to another, but the combined energy of the colliding particles remains unchanged. Between gas particles, there are no forces of attraction or repulsion.
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What belief has the scientist in The Daily Times article developed as a result of experimentation?
1. He believes that if deafness is caused by a defective gene, gene therapy has the potential to cure many forms of hearing loss.
2. He believes that deafness is not hereditary, therefore there is no gene treatment that applies.
3. He believes that the scientists that conducted the study do not have the credentials to validate the results.
4. He believes that the tests are not valid and the results are not true.
The belief that scientists in The Daily Times article developed as a result of experimentation is he believes that if deafness is caused by a defective gene, gene therapy has the potential to cure many forms of hearing loss. The correct option is 1.
What is gene therapy?Gene therapy is a process in which the defective gene is repaired by scientific methods. Gene therapy is a form of genetic engineering. It is an attempt to cure diseases. It involves replacing a mutated gene.
Therefore, the correct option is 1. He believes that if deafness is caused by a defective gene, gene therapy has the potential to cure many forms of hearing loss.
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As Nicole walks to her dorm room after a study group in the library she sees a backpack being stolen. The neurotransmitter activated during this emergency situation is
Multiple choice question.
a. norepinephrine.
b. endocrine.
c. insulin.
d. serotonin.
The neurotransmitter activated during the emergency situation is option A: norepinephrine.
A neurotransmitter and a hormone, norepinephrine is also known as noradrenaline. Dopamine is converted into norepinephrine, a neurotransmitter. Nerve cells in the brainstem region and a region close to the spinal cord produce norepinephrine. Your adrenal glands release norepinephrine, a hormone, in response to stress. The fight-or-flight response is a response that alters several bodily functions. Thus, it perceives danger as mentioned in the question.
The sympathetic nervous system, which is a component of your body's immediate "fight-or-flight" response to danger, produces norepinephrine. The flight-or-flight reaction is also referred to as the acute stress response in medicine.
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describe what happens during the citric acid cycle and identify where the carbon atoms of acetyl coa end up and where the energy that was stored in acetyl coa ends up.
Through a series of enzymatic reactions, the two carbons that were formerly the acetyl group of acetyl CoA are released as carbon dioxide, one of the primary byproducts of cellular respiration, in the citric acid cycle.
All six carbon atoms from the original glucose molecule are eventually incorporated into carbon dioxide because the two acetyl carbon atoms will eventually be released on later turns of the cycle.
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How many individual decay steps are in the decay chain of uranium-238 before the stable end product of lead-206 is produced?
When stable lead-206 is produced by the radioactive decay of uranium-238, it passes through a 14-step radioactive decay series. There are eight and six decays in this sequence.
What is radioactive decay ?Ionizing radiation is released as a result of radioactive decay. Ionizing radiation offers a health concern by destroying tissue and the DNA in genes because it can damage the atoms in living things.
The decay chain is the collection of decay products produced to achieve this equilibrium. For instance, after producing intermediates like Uranium-234, Thorium-230, Radium-226, and Radon-222, the decay chain starting with Uranium-238 ends in Lead-206. Known as the "decay series" as well.
The daughter nucleus, thorium 234, is created by the alpha emission of a uranium 238 nuclei. This thorium then changes into protactinium 234 and experiences beta-negative decay to yield uranium 234 as a byproduct.
Thus, When stable lead-206 is produced by the radioactive decay of uranium-238, it passes through a 14-step radioactive decay series.
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PLEASE HELP!!!
Consider the decomposition of hydrogen peroxide. Complete the chemical reaction. What is the missing product? How many molecules are needed to balance the equation?
Responses
A 3 molecules of water.3 molecules of water.
B 1 water molecule.1 water molecule.
C 2 molecules of H202 molecules of H 2 0
D 2 molecules of H2
Answer:
C
Explanation:
Hydrogen peroxide is H2O2 which decomposes to water and oxygen
so
2H2O2 => 2H2O + O2
Which of the following is the net ionic equation for the
reaction between aqueous sodium fluoride and hydrochloric
acid?
NaF(aq)+HCl(aq)→NaCl(aq)+HF(aq)
Na+(aq)+F−(aq)+H+
(aq)+Cl−(aq)→Na+(aq)+Cl−(aq)+HF(aq)
Na+(aq)+Cl−(aq)→NaCl(aq)
F−(aq)+H+(aq)→HF(aq)
This reaction's molecular equation is NaF(aq) + HCl(aq) ==> NaCl(aq) + HF (aq) Because HF is a weak acid, we won't ionize it and will instead write the following net ionic equation: H+(aq) plus F-(aq) equals HF (aq)
How is an ionic equation written?By dissolving all soluble ionic chemicals (those denoted with a (aq)) into their corresponding ions, the ionic equation can be written. To demonstrate that an ion is present in solution, it should be displayed with its charge and a (aq). To display the quantity of each ion present, use coefficients.
What does "net ionic equation" mean?A chemical equation known as a net ionic equation only includes the ions that are undergoing chemical change as the reaction progresses.
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PLEASE HELP AS SOON AS POSSIBLE!!
Balance the equation and indicate whether it is a synthesis reaction, a dedo position reaction, a single-displacement reaction, a double- displacement reaction or a combustion reaction.
The question is in the photo below!!! Thanks!!
Answer:
2H2 + O2 → 2H2O
Double-displacement reaction
too ezyyy
Explanation:
Triglycerides are biosynthesized by phosphorylated glycerol and enzyme functionalized fatty acid esters. Triglycerides are produced by enzymatic ______________________.
The action of lipase is much more manifest on triglyceride, and it is also much faster the higher the molecular weight of the fatty acid present.
What enzyme breaks down triglycerides into monoglycerides?The salivary glands, stomach, and pancreas secrete lipase enzymes to break down triglycerides into monoglycerides, fatty acids, and glycerol.It acts on the surface and in an aqueous medium, the emulsifying agent represented by bile salts is essential for optimum effectiveness.They are widely distributed, with a presence in the animal and plant kingdoms and even in the simplest unicellular organisms.Every fatty acids has a long hydrocarbon chain (with even amounts of carbons, usually 16 or 18) and a carboxyl group.Glycerol is a 3-carbon molecule with 3 -OH groups. Fatty accids and glycerol can be connected by single or double bonds, depending on if the fatty acid is saturated or unsaturated.when a lipid forms, the -COOH functional groups of 3 fatty acids react with -OH groups of glycerol. This leaves 16, 18, or 20 carbons, making a triglyceride 16, 18, or 20 carbons long.Lipases are a set of water-soluble enzymes that hydrolyze substrates such as triglycerides and phospholipids, have a similar structure and are essential in the metabolism of lipoproteins and lipids.That is, the function of lipase enzymes is to hydrolyze triglycerides to generate diglycerides, monoglycerides, fatty acids and glycerol.To learn more about triglycerides refer to:
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dalton supported his atomic theory with experimental evidence. what experiment would have supported the postulate that in chemical reactions, atoms are combined, separated, or rearranged
In 1803 Dalton discovered that oxygen combined with either one or two volumes of nitric oxide in closed vessels over water and this pioneering observation of integral multiple proportions provided important experimental evidence for his incipient atomic ideas.
In closed vessels over water, Dalton observed in 1803 that oxygen interacted with either one or two volumes of nitric oxide. This ground-breaking observation of integral multiple proportions offered crucial experimental support for his developing atomic theories.
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when considering whether a toxic compound will easily move through soil and enter the groundwater--which of the following properties must be identified?
The property that must be identified to consider whether a toxic compound will easily move through soil and enter the groundwater is: D. Soil sorption coefficient (Kd).
What is the soil sorption coefficient?Soil sorption coefficient (Kd) is the measurement to predict the amount of chemical substance absorbed into the soil per amount of water. This measurement is also called Freundlich solid-water distribution coefficient. To calculate the Kd value, we could use the equation as follows:
Kd = concentration on the solids (mg/kg) / concentration in the pore water (mg/L)
“The question seems incomplete. The complete query is as follows:
When considering whether a toxic compound will easily move through soil and enter the groundwater—which of the following properties must be identified?
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a mixture of helium and neon gases is collected over water at 28oc and 456 mmhg. if the partial pressure of he is 240 mmhg, what is the partial pressure of neon? (vapor pressure of water at 28oc is 28.3 mmhg)
Answer:
i need points
Explanation:
what mass of cacl2 is required to make 53 ml of a 0.020 m cacl2 solution? g cacl2 how many moles of chloride ions are present in the solution?
1.176 g of CaCl2 is required to make 53 mL of a 0.020 M CaCl2 solution, and there are 0.0106 moles of chloride ions present in the solution.
What is chloride ion?
The anion (negative charges ion) called Cl is the chloride ion. It is created when a compound like hydrogen chloride dissolves in water or even other polar solvents, or when the halogen element chlorine gains an electron. Sodium chloride and other chloride salts are frequently very water soluble. It is a crucial electrolyte that is present in all bodily fluids and is in charge of maintaining the proper acid-base balance, transmitting nerve signals, and controlling the flow of fluid into and out of cells. Less frequently, this same word chloride could also be included in chemical compounds' "common" names. These compounds contain one or even more chlorine atoms bound together covalently.
To calculate the mass of CaCl2 required to make 53 mL of a 0.020 M CaCl2 solution, we need to use the equation:
Mass (g) = Volume (mL) x Molarity (M) x Molar Mass (g/mol)
Mass (g) = 53 mL x 0.020 M x 110.98 g/mol
Mass (g) = 1.176 g CaCl2
To calculate the number of moles of chloride ions in the solution, we need to use the equation:
Moles = Mass (g) x (1mol/Molar Mass (g/mol))
Moles = 1.176 g x (1mol/110.98 g/mol)
Moles = 0.0106 moles Cl- ions
Therefore, 1.176 g of CaCl2 is required to make 53 mL of a 0.020 M CaCl2 solution, and there are 0.0106 moles of chloride ions present in the solution.
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in a titration of 35.00 ml of 0.737 m h2so4, ml of a 0.827 m koh solution is required for neutralization. question 25 options: 25.8 62.4 39.3 1.12 35.0
For neutralization in a titration of 35.00 mL of 0.737 M H₂SO₄, 62.4 mL of a 0.827 M KOH solution is needed.
H₂SO₄ + 2 KOH ---> K₂SO₄+ 2 H₂O
from the concentration equation
m1 n1 v1 = m2 n2 v2 ( since m = molarity , n = factor and v = volume)
M1 = 0.737 M
n1 = 2
V1 = 35 mL
M2 = 0.827 M
n2 = 1
V2 = ??
0.737 m x 2 x 35 mL = 0.827 m x 1 x v2
v2 =62.4
Hence, 62.4 mL of a 0.827 M KOH solution is needed for neutralization.
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Calculate the standard reaction entropy for the decomposition of 1 mol calcite to carbon dioxide gas and solid calcium oxide at 25°c.
For the breakdown of 1 mol of calcite to carbon dioxide plus white precipitate oxide at 25°c, the standard reaction entropy is 160.6 J/mol*K.
How do you define reaction in chemistry?In a chemical reaction, one or more materials known as reactants—are changed into one or more additional substances as products. Chemical elements or chemical compounds make up substances.
What kind of response?Synthesis, decomposition, only one, double-replacement, and combustion are the five fundamental varieties of chemical reactions. You can classify a reaction into one of these groups by looking at the reactants and products. Several categories will apply to some reactions.
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The complete question is-
Calculate the standard reaction entropy for the decomposition of 1 mol calcite to carbon dioxide gas and solid calcium oxide at 25°C.
CaCO₃ (s) → CO₂ (g) + CaO (s)
(a). -160.6 J/mol*K
(b). 160.6 J/mol*K
(c). 346.4 J/mol*K
(d). -266.9 J/mol*K
equal volumes of 0.500 m hco2h and 0.100 m na(o2cch3) are mixed. what is the ph of the resulting solution? the pka of hco2h is 3.75 and the pka of ch3co2h is 4.75.
The addition of 0.1 M HCl lowers the pH of the solution. The pH starts to decline gradually at first.
Sodium acetate is 0.1M and acetic acid is 0.2M. So, 4.7 and log (0.1/0.2) added together give the pH value. i.e., 4.39. A solution with 0.2M acetic acid and 0.1M sodium acetate, therefore, has a pH of 4.39. Because H+ aq is smaller in size and more mobile than Na+ aq, it will have a greater m in 0.1 M HCl.
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the specific heat of solid water and liquid watrer are 2.03 jgc and 4.18 g c respectively. calculate the heat of fusion of water in j/g
The heat of fusion of water is 335.091 j/g when considering the concept of calorimetry, sensible heat, and latent heat.
What is a simple definition of calorimetry?
Calorimetry is a branch of science that measures a body's status with regard to temperature in order to look at changes in its physical and chemical composition. The changes could be chemical, like burning, acid-base neutralization, or physical, such melting or evaporation.
What is the calorimetry's fundamental tenet?
Calorimeter Theory
While the body at a lower temperature absorbs heat, the body at a higher temperature releases heat. The law of conservation of energy is demonstrated by the principle of calorimetry, which states that the total amount of heat lost by a heated body is equal to
Briefing:
The total heat required is calculated as:
Total heat required= Q1 + Q2 + Q3
Total heat required= 2.50 kJ + 49.3 g× ΔHfus + 9.21 kJ
Heating a 49.3 g sample of g ice from -25.0 °C to water at 44.7 °C requires 28.23 kJ of heat. This is, the total heat required is 28.23 kJ. Then:
28.23 kJ= 2.50 kJ + 49.3 g× ΔHfus + 9.21 kJ
Solving:
28.23 kJ= 11.71 kJ + 49.3 g× ΔHfus
28.23 kJ- 11.71 kJ = 49.3 g× ΔHfus
16.52 kJ = 49.3 g× ΔHfus
16.52 kJ / 49.3 g= ΔHfus
0.335091= 335.091 =ΔHfus
In summary, the heat of fusion of water is 335.091 .
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the fusion of hydrogen into helium in the core of the sun can be summarised as : 4 hydrogen nuclei are converted into one helim nucleus some gamma rays a netruino
The statement give in question is false as 4 hydrogen nuclei are converted into one helim nucleus some gamma rays, only two atom come together for fusion reaction.
The core is the power generator in the Sun. The core radius is close to one-fourth of that of the star. Inside the core, pressures and temperatures are high enough to make fusion. In a nuclear fusion reaction, the nuclei of two atoms come together to make a new atom. In the core of a sun, two hydrogen atoms combine to form a helium atom. The proton-proton cycle is an essential reaction that occurs within the core of the Sun.
H + H → He + ENERGY
In the proton-proton chain reaction, hydrogen nuclei are converted to helium nuclei through many intermediates. This reaction generates high-energy photons (gamma rays). This energy can be calculated by the famous Einstein equation, E = mc2.
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