Answer:
The stronger acid in the first pair is HBrO3 because it has a higher oxidation state of the central atom than HBrO4.
The stronger acid in the second pair is H2S04 because it has a higher oxidation state of the central atom than HSeO4.
The predominant reason determining the relative strength in each case is the oxidation state of the central atom. A higher oxidation state of the central atom will result in a stronger acid.
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a reaction has a standard free‑energy change of −11.60 kj mol−1(−2.772 kcal mol−1). calculate the equilibrium constant for the reaction at 25 °c.
The equilibrium constant for the reaction with a standard free‑energy change of −11.60 kj mol⁻¹ (−2.772 kcal mol⁻¹) at 25 °C is 1.38 × 10⁶.
To determine the equilibrium constant that the given standard free energy change (∆G°) is -11.60 kJ/mol, which is equal to -2.772 kcal/mol and the temperature is 25 °C which is 298 K, we must find the relationship between the equilibrium constant (K) and ∆G° is given by the following equation:
∆G° = -RT lnK
where, R is the gas constant = 8.314 J/mol K, T is the temperature in Kelvin, and ln is the natural logarithm.
Hence, the value of the equilibrium constant can be calculated as follows:
K = e^(-∆G°/RT)
K = e^(-(-11600)/(8.314 × 298))
K = e^(14.391)
K = 1.38 × 10⁶
Thus, the equilibrium constant (K) for the given reaction at 25 °C is 1.38 × 10⁶.
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Which of the following DECREASES the solubility of CaÂÂ3(PO4)2 solid in water?
a) Double the amount of water
b) Adding NaOH solution to the solution
c) Adding lemon juice
d) Adding HCl solution
e) Adding EDTA solution
The correct option that decreases the solubility of Ca3(PO4)2 solid in water is (e) Adding EDTA solution as it decreases the solubility of Ca3(PO4)2 solid in water by forming complexes with the calcium ions..
The solubility of a compound in water is influenced by various factors, including the presence of other substances that can interact with the compound. In this case, we are considering the solubility of Ca3(PO4)2, which is calcium phosphate, in water.
(a) Doubling the amount of water does not directly affect the solubility of Ca3(PO4)2. The amount of water available does not change the chemical properties of the compound.
(b) Adding NaOH solution to the solution would increase the solubility of Ca3(PO4)2. NaOH is a strong base that can react with the phosphate ions (PO4^3-) to form more soluble compounds.
(c) Adding lemon juice, which is acidic, can also increase the solubility of Ca3(PO4)2. The acid in lemon juice can react with the calcium phosphate, resulting in the formation of more soluble compounds.
(d) Adding HCl solution, which is also acidic, can increase the solubility of Ca3(PO4)2 for the same reason mentioned above. The acid can react with the compound and increase its solubility.
(e) Adding EDTA (ethylenediaminetetraacetic acid) solution decreases the solubility of Ca3(PO4)2. EDTA forms stable complexes with metal ions such as calcium, preventing them from participating in the dissolution process. Therefore, adding EDTA reduces the availability of calcium ions and decreases the solubility of Ca3(PO4)2.
In conclusion, the correct option is (e) Adding EDTA solution, as it decreases the solubility of Ca3(PO4)2 solid in water by forming complexes with the calcium ions.
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A student states, "When the alcohol sample was at a temperature of 500 K, all the particles were moving faster than any of the particles were moving at 400 K." Do you agree or disagree with this student’s statement? Justify your answer
Answer: i rlly dont know srry
Explanation:
In an aqueous solution which substance yields hydrogen ions as the only positive ion *
Answer:
CH3COOH
Explanation:
Which of the following is an example of a behavioral trait that
is likely to increase reproductive success?
O colorful feathers
O a dance
O tail length
Answer:
The answer is option A
Colorful feathers
Hope this helps you
Which property do these three objects have in common?
lemonade
hair clip
mustard
Select the best answer.
soft stretchy yellow
The property that lemonade, a hair clip, and mustard all have in common is that they are all yellow.
Lemonade is typically made from lemons, which gives it a yellow hue. Hair clips can come in various colors, but in this case, the hair clip being referred to is yellow. Mustard is a condiment made from mustard seeds, which are ground into a paste and mixed with other ingredients, resulting in a distinctive yellow color.
While these objects have different functions and characteristics, their commonality is the yellow color that makes them easily identifiable. This shared property helps to establish a visual connection between these three seemingly unrelated items.
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What are the two 2 types of inner transition metals?
The two types of inner transition metals are the lanthanides and the actinides. The lanthanides consist of the elements from cerium (atomic number 58) to lutetium (atomic number 71). The actinides consist of the elements from thorium (atomic number 90) to lawrencium (atomic number 103).
The lanthanides are also called the rare earth elements, and they tend to have similar chemical properties due to their close proximity on the periodic table. They are all silvery-white metals and are often used in industrial and manufacturing processes.
The actinides are also silvery-white metals, but they tend to be more radioactive than the lanthanides and have less predictable chemical properties. They are generally only found in small amounts in nature, and are mostly produced synthetically for research and industrial uses.
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Each neutral element has a unique number of____ . Therefore, each element releases specific_______ when jumping down from excited state . Each chemical plement produces unique set of _______ Stars are made up of different ________. So we can identify the star's ________ by analyzing the spectrum.
Each neutral element has a unique number of electrons and protons. Therefore, each element releases specific electrons when jumping down from an excited state. Each chemical element produces a unique set of neutrons.
What are subatomic atoms?
Any of the numerous self-contained particles of matter or energy that make up the building blocks of all matter. Also known as an elementary particle. Both the heavier constituents of the atom's small but extremely dense nucleus, the positively charged protons as well as the electrically neutral neutrons, as well as the electrons, the negatively charged, nearly massless particles that still make up the majority of the atom's size, are examples of subatomic particles.
These fundamental atomic building blocks, however, are not the only subatomic particles that have been identified. For example, quarks are the fundamental building blocks of protons, neutrons, and other basic particles. The electron is only one of these particles, along with the muon and neutrino, that belong to this class.
Therefore, each neutral element has a unique number of electrons and protons. Therefore, each element releases specific electrons when jumping down from an excited state. Each chemical element produces a unique set of neutrons.
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When is electrolysis used to extract metal?
Answer:
Explanation:
electrolysis is the technique that use direct current to drive a non spontaneous chemical reaction chemical reaction is the gain or lose of electron this technique is use to extract metal from theirs ores
How many grams of mercury can be produced if 18.0 g of mercury (11) oxide decomposes?
Answer:
m = 16.67 g of Hg
Explanation:
Let's write the overall decomposition reaction that is taking place:
2HgO ---------> 2Hg + O₂
According to the balanced reaction, we can see that the mole ratio between HgO and Hg is the same (2:2 or 1:1), therefore, we can assume that the moles reactants of HgO would be the moles produced of Hg. So, in order to get the grams of mercury, we need to determine the moles first.
To get the moles, we need to use the following expression:
moles = mass / MM (1)
The molar mass of HgO can be calculated using the atomic weights, which are:
Hg: 200.59 g/mol ; O: 15.999 g/mol
MM HgO = 200.59 + 15.999 = 216.589 g/mol
The moles are:
moles HgO = 18 / 216.589 = 0.0831 moles
As we stated before, moles reactants are the same moles produced, so:
moles HgO = moles Hg = 0.0831 moles of Hg.
Finally, to get the mass, we just solve the mass from (1):
m = moles * MM (2)
m = 0.0831 * 200.59
m = 16.67 g of HgHope this helps
calculate the concentration of the following in milligrams per liter: 0.01000 n ca2 c. 0.02000 n h2so4 1.000 m hco3 d. 0.02000 m so42
The concentration of the following in milligrams per liter will be: 0.01000 M Ca₂⁺ = 400.8 mg/ L, 0.02000 M H₂SO₄ = 1966.56 mg/L, 1.000 M HCO₃ = 61010 mg/L, 0.02000 M SO₄² = 1920.12 mg/L.
To convert the concentration of a solution from moles per liter (M) to milligrams per liter (mg/L), we need to multiply the molar concentration by the molar mass of the solute in grams.
0.01000 M Ca²⁺: The molar mass of Ca₂⁺ is 40.08 g/mol, so the concentration in mg/L is 0.01000 M × 40.08 g/mol × 1000 mg/g = 400.8 mg/L
0.02000 M H₂SO₄: The molar mass of H₂SO₄ is 98.08 g/mol, so the concentration in mg/L is 0.02000 M × 98.08 g/mol × 1000 mg/g = 1966.56 mg/L
1.000 M HCO₃-: The molar mass of HCO₃⁻ is 61.01 g/mol, so the concentration in mg/L is 1.000 M × 61.01 g/mol × 1000 mg/g = 61010 mg/L
0.02000 M SO₄²⁻: The molar mass of SO₄²⁻ is 96.06 g/mol, so the concentration in mg/L is 0.02000 M × 96.06 g/mol × 1000 mg/g = 1920.12 mg/L
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why oxalic acid prevents catalytic degradation of ascorbic acid by catalytic ferric acid
Oxalic acid prevents the catalytic degradation of ascorbic acid by catalytic ferric acid due to its ability to form a complex with ferric ions, thereby inhibiting their catalytic activity. This complex formation prevents the ferric ions from participating in the oxidation reaction of ascorbic acid.
Catalytic degradation of ascorbic acid refers to the process where ascorbic acid (vitamin C) undergoes oxidation in the presence of a catalyst, such as ferric ions (Fe³⁺), resulting in the degradation of ascorbic acid and the formation of degradation products. However, oxalic acid can prevent this catalytic degradation by forming a complex with ferric ions.
Oxalic acid contains carboxylic acid groups, which can readily bind to metal ions like ferric ions. When oxalic acid is present in the reaction mixture, it can complex with the ferric ions, forming a stable complex. This complex formation prevents the ferric ions from being available as catalysts for the oxidation reaction of ascorbic acid.
By sequestering the ferric ions, oxalic acid effectively inhibits their catalytic activity, thereby preventing the degradation of ascorbic acid. This protective effect of oxalic acid is attributed to its ability to chelate with the ferric ions, forming a stable complex that reduces their reactivity towards ascorbic acid.
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Now prepare the cold sand and cold water samples from part A:
Fill a 100-milliliter container with 50 grams of sand. Fill a 100-milliliter container with 50 grams of cold tap water. Fill the last 100-milliliter container with 100 grams of cold tap water. Use the scale to measure the masses.
a scale measuring 100 grams of cold water in a 100-milliliter container, with 100-milliliter containers holding 50 grams of sand and 50 grams of cold water alongside
Pour all the ice cubes into a tub, and fill it with cool tap water to a depth of 2 inches. Place the sand and water samples in the ice water. Cover the entire tub.
three 100-milliliter containers in an ice bath inside a covered tub, with one container holding 50 grams of sand, one holding 50 grams of cold water, and one holding 100 grams of cold water
Every 15 minutes, remove the cover and check the temperatures of the samples using the three thermometers. Wait 30 seconds before recording the thermometer reading. Once the temperatures of the three samples are no more than a degree apart, record the temperatures.
After 45 minutes, the temperature of the sand sample was -1°C, the temperature of the 50-gram cold water sample was 0°C, and the temperature of the 100-gram cold water sample was 0°C.
What is temperature?
The experiment is testing the ability of different substances to retain or lose heat in a cold environment. By placing the sand and water samples in an ice water bath and checking their temperatures every 15 minutes, the experiment shows how long it takes for each substance to reach thermal equilibrium with the cold environment. The final temperatures of the samples after 45 minutes show that the sand reached a lower temperature than the water samples, indicating that it lost heat more quickly. This is because sand has a lower heat capacity than water, meaning it takes less energy to change its temperature. The two water samples reached the same temperature, demonstrating that the amount of water in a sample does not affect its ability to retain heat in a cold environment.
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How is a double displacement reaction completed and balanced
A double displacement reaction is a type of reaction in which two reactants exchange ions to form two new compounds. Many double displacement reactions occur between ionic compounds that are dissolved in water. A double replacement reaction is represented by the general equation.
When Hydrogen and Oxygen
form a molecule, what happens to their neutrons?
A. They share their neutrons:
B. They both lose neutrons.
C. Nothing happens to their neutrons.
8. When 50.0 g of MgCO3 react completely with H3PO4, as shown below, 15.8 g of CO₂ is produced.
Determine the theoretical and percent yield for this reaction?
2 H3PO4 + 3 MgCO3 → Mg3(PO4)2 + 3 CO2 + 3 H₂O
The theoretical yield for this reaction is 78.61 g of CO2 and the percent yield is 20.0%, when 50.0 g of MgCO3 react completely with H3PO4.
What is theoretical yield?The theoretical yield is the maximum amount of product that can be produced from a chemical reaction, calculated using the stoichiometry of the reaction equation. It is based on the assumption that the reaction proceeds perfectly, without any loss or waste of reactants, and without any interference from side reactions.
The theoretical yield is calculated by determining the number of moles of each reactant, using the balanced chemical equation to calculate the number of moles of product that can be produced, and then converting this to the corresponding mass of product. It is a useful reference for determining the efficiency of a reaction and for evaluating the quality of the results obtained in a laboratory experiment.
Calculation of Theoretical yield
To calculate the theoretical yield, determine the number of moles of MgCO3 and use the balanced chemical equation to calculate the number of moles of CO2 produced.
The number of moles of MgCO3 is given by:
n(MgCO3) = m(MgCO3) / M(MgCO3)
n(MgCO3) = 50.0 g / 84.31 g/mol
n(MgCO3) = 0.595 mol
Using the balanced chemical equation, calculate the number of moles of CO2 produced:
n(CO2) = 3 * n(MgCO3)
n(CO2) = 3 * 0.595 mol
n(CO2) = 1.785 mol
The mass of CO2 produced can then be calculated:
m(CO2) = n(CO2) * M(CO2)
m(CO2) = 1.785 mol * 44.01 g/mol
m(CO2) = 78.61 g
This is the theoretical yield for the reaction.
The percent yield is a measure of the efficiency of the reaction, and is calculated as the ratio of the actual yield to the theoretical yield, multiplied by 100:
% yield = (actual yield / theoretical yield) * 100
% yield = (15.8 g / 78.61 g) * 100
% yield = 20.0%
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An aluminum wing on a passenger jet is 26 m long when the temperature is 24.3 degrees Celsius. Using eBook Table 5.2, at what temperature (in degrees Celsius) would the wing be 1 mm shorter?
The correct answer is -24.3°C.
What is Thermal expansion?
Thermal expansion refers to the process whereby an object increases in size as a result of temperature changes. Since most materials expand when heated and contract when cooled, this phenomenon is commonly observed. When materials are heated, they expand; as they are cooled, they contract. Because of the way molecules interact with one another, the expansion and contraction of materials are linked to changes in their internal energy. Consideration of thermal expansion is essential when designing everything from buildings to bridges and from satellites to coffee cups.
Explanation:We'll use the formula for linear thermal expansion to calculate the temperature change.ΔL = αLΔT,
whereΔL = change in length
L = original length
ΔT = change in temperature
α = coefficient of linear expansion
The formula can be rearranged to solve for ΔT.ΔT = ΔL / αL
From Table 5.2 in the eBook, the coefficient of linear expansion for aluminum is 24.0 × 10^-6 (°C)^-1.ΔL = 1 mm = 0.001 mL = 26 mΔT = ΔL / αLΔT = (0.001 m) / (24.0 × 10^-6 (°C)^-1 × 26 m)ΔT = 16.03°C
Now, we must find the temperature at which the aluminum wing is 1 mm shorter.
ΔT = T2 - T1ΔT = (T2 - 24.3°C) = 16.03°CT2 = 40.33°C -24.3°C = T2 - 24.3°CT2 = -24.3°C + 40.33°CT2 = 16.03°C
Therefore, at -24.3°C, the aluminum wing on a passenger jet is 1 mm shorter.
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A student is trying to identify an unknown metal X. When he puts it in copper sulphate there is a reaction and red brown pieces of copper fall to the bottom of the test tube. But when he puts metal X into magnesium chloride nothing happens
A) Give two identity of metal X.
B) Out of these two which one is metal X ?
The unknown metal X is iron metal as it reacts with copper sulfate solution but does not react with magnesium chloride.
What is displacement reaction?Some metals are very reactive while other metals are less reactive or unreactive. When a more reactive metal is added to the solution of a less reactive metal, then the more reactive displaces the less reactive metal from its solution is known as a displacement reaction.
The general form of a single displacement reaction can be represented as:
\(A + BC \longrightarrow B + AC\)
When iron is placed in copper sulfate (CuSO₄) solution then the blue color of the copper sulfate solution turns a red-brown coating of copper metal deposited on the iron.
\(CuSO_4 (aq)+ Fe (s)\longrightarrow FeSO_4 (aq) +Cu(s)\)
Iron lies above the electrochemical series and is more reactive than copper. So it reacts with copper sulfate but does not give any reaction with magnesium chloride.
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HELP !!!
1. How do substances like CO2 and water move in and out of the cell? Explain.
Answer:
The substances like CO2 and water move in and out of a cell by diffusion from the region of high concentration to low concentration. ... When the concentration outside the cell becomes low and it is high inside the cell, they moves out.
Answer:
CO2 moves by diffusion and H2O move by osmosis through cell membrane .2KCIO3 -- 2KCL+3o2 is a balanced equation
a) state what is a balanced equation
b) Give a reason why the above equation is balecand
Answer:
a) Balanced equation:
An equation is called balanced if there are same number and same type of atom on both sides of the equation.
b)Reason:
2KClO3--------2KCl + 3O2
Consider this equation in the reactants there are 2KClO3 and in the product there are 2KCl+3O2 . So reactants =products which is a case of balanced chemical equation .
Explanation:
Chemical Formula:
4Ca(OH)2
In the chemical formula above, how many different types of elements are present in a molecule of this formula?
Answer:
They are just two....Ca and OH
2 H2 + 1 O2 -> 2 H2O How many grams of water can be produced from 3 moles of hydrogen gas?
Answer:
54 grams
Explanation:
Mole ratio is 2:2
3 mol H2 * 2 mol H2O/2 mol H2 = 3 mol H2O
Convert to grams by using the mass of water
3*18=54 grams
how to make sweetened condensed milk from evaporated milk?
Answer:
Just combine one 12-oz can of evaporated milk and 1-1/2 cups granulated sugar in a sauce pan. Bring the mixture to a boil over medium heat, stirring constantly. Continue cooking, until the sugar dissolves, and the milk thickens slightly. Allow your sweetened condensed milk to cool.
Explanation:
hope this helps
Answer:
Mix one 12-oz can of evaporated milk and 1-1/2 cups granulated sugar. :)
Using the following equation:
2NaOH + H2SO4 = 2H2O + NaSO4
How many grams of sodium sulfate will be formed if you start with 200 grams of sodium hydroxide and you have an excess of sulfuric acid?
Taking into account the reaction stoichiometry, 355 grams of Na₂SO₄ will be formed if you start with 200 grams of sodium hydroxide and you have an excess of sulfuric acid.
Reaction stoichiometryIn first place, the balanced reaction is:
H₂SO₄ + 2 NaOH → Na₂SO₄ + 2 H₂O
By reaction stoichiometry, the following amounts of moles of each compound participate in the reaction:
H₂SO₄: 1 moleNaOH: 2 moles Na₂SO₄: 1 moleH₂O: 2 molesThe molar mass of the compounds is:
H₂SO₄: 98 g/moleNaOH: 40 g/moleNa₂SO₄: 142 g/moleH₂O: 18 g/moleBy reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
H₂SO₄: 1 mole× 98 g/mole= 98 gramsNaOH: 2 moles× 40 g/mole= 80 gramsNa₂SO₄: 1 mole× 142 g/mole= 142 gramsH₂O: 2 moles× 18 g/mole= 36 gramsMass of Na₂SO₄ formedIt can be applied the following rule of three: if by reaction stoichiometry 80 grams of NaOH form 142 grams of Na₂SO₄, 200 grams of NaOH form how much mass of Na₂SO₄?
mass of Na₂SO₄= (142 grams of Na₂SO₄×200 grams of NaOH) ÷80 grams of NaOH
mass of Na₂SO₄= 355 grams
Finally, 355 grams of Na₂SO₄ are formed.
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Which part of a cell directs the cell's activities and holds its DNA?
A. Mitochondrion
B. Ribosome
C. Nucleus
D. Cell membrane
Answer:
Nucleus is the answer
A micrograph of animal cells, showing the nucleus (stained dark red) of each cell. Known as the cell's “command center,” the nucleus is a large organelle that stores the cell's DNA (deoxyribonucleic
Answer:
nucleus is the part of a cell directs the cells Activities and holds it's DNA
Henry’s law constant for gas x is 3. 30 x 10-2 m/atm. What total volume of solution is needed to completely dissolve 1. 65 l of gas at a pressure of 725 torr and a temperature of 25 °c?.
Henry's law, a gas law in physical chemistry, asserts that the quantity of dissolved gas in a liquid is inversely proportional to the partial pressure of the gas above the liquid. Henry's law constant is the name of the proportionality constant.
William Henry, an English chemist, developed Henry's law around the beginning of the 19th century. It claims that the relationship between dissolved gas concentration and gas phase partial pressure is linear. The Henry's law constant is the name of the proportionality factor.
Kн K1 is equal to 1.25 x 10-3 mol dm-3 atm-2.
KH times Pgas equals soluble.
Solvability = 1.25 x 10-3 x 2.5
Solubility is equal to 3.125* 10-3 mol/dm2.
The Henry's law constant (KH), commonly known as the air-water partition coefficient, is the ratio of a compound's concentration in water to its partial pressure in the air at a given temperature.
For example, moles per cubic meter for water and atmospheres for air (atm-m3/mol), or in a dimensionless unit like KH′ = KH/(RT), where KH′ is the dimensionless unit Henry's law constant (atm-m3/mol), ideal gas constant (8.20575 105 atm-m3/mol-K), and water temperature (K).
When a compound's molecular weight is less than 200 grammes per mole and its Henry's law constant is more than 103 atm-m3/mol, it is often classified as volatile.
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The most likely reason for colloidal dispersion is __________.
[A] the Tyndall effect
[B] emulsion formation
[C] precipitation
[D] electrostatic repulsion
[E] coagulation
The most likely reason for colloidal dispersion is electrostatic repulsion. Option [D] is correct.
What is colloidal dispersion?This sample shows particles invisible to standard microscopy. It will pass through the filter paper, but not through the semi-permeable membrane. Centrifuged particles. spread gradually.
Three types of colloidal dispersion:
Emulsions are between two liquids. Foam occur when many gas particles are trapped in a liquid or solid.Aerosols contain small liquid or solid particles dispersed in a gas.Repulsive electrostatic double-layer forces are involved in stabilizing charged colloidal particles in the presence of adsorbed light. Aggregation occurs simply as a result of a decrease in the surface charge of the particles (decreased zeta potential), a decrease in the electrical repulsion between colloidal particles, and the formation of van der Waals forces that promote initial aggregation of the colloidal particles.
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distance time graphs are made by plotting data for time and what?
Answer:
A distance-time graph shows how far an object has travelled in a given time. Distance is plotted on the Y-axis (left) and Time is plotted on the X-axis (bottom).
If a substance has a half-life of 72.8 min, and if 65.0 g of the substance are initially present, how many grams will remain after precisely three hours
11.7 grams will remain after precisely three hours.
Why does radioactivity exist?The word "radioactivity" is used to define the natural mechanism by which certain atoms spontaneously split apart, producing energy and particles as they change into new, more stable atoms. Due to the tendency of unstable isotopes to change from a more stable state, this process, also known as radioactive decay, takes place.
Determine grams remaining after precisely three hours.
Given, t = 72.8 min
T = 3hours = 180 min
initial amount, A° = 65 g
now, A = A° (1/2)∧T/t
A = 65(1/2)∧180/72.8
A = 65(1/2)∧2.47
A = 65 (0.1805)
A = 11.7 g
11.7 grams will remain after precisely three hours.
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Edward is going to paint the front and back of 6 rectangular doors. Each door measures 2. 8 ft wide and 6. 8 ft long. One can of paint covers 62. 5 ft2. What is the minimum number of cans of paint Edward will need to paint all the doors?
To find the minimum number of cans of paint Edward will need to paint all the doors, we first need to calculate the total area that needs to be painted. Each door has a front and a back, so there are 2 sides per Door .
The area of one side is the product of the width and length, which is 2.8 ft * 6.8 ft = 19.04 ft². Therefore, the total area for both sides of one door is 2 * 19.04 ft² = 38.08 ft².
Since Edward has 6 doors, the total area to be painted is 6 * 38.08 ft² = 228.48 ft².
Given that one can of paint covers 62.5 ft², we can calculate the minimum number of cans needed by dividing the total area by the coverage of one can: 228.48 ft² / 62.5 ft² = 3.6552.
Since we can't have a fraction of a can, Edward will need a minimum of 4 cans of paint to paint all the doors.
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