The half-life of cesium-137 is 30 years. Suppose we have a 150 mg sample. The masses (in mg) that remains after t years A=150/2^t/30yrs
what do you mean by half-life?A substance's half-life is the amount of time it takes for half of it to decompose.
What is a half-life example?Half-life is the length of time it takes for half of an unstable nucleus to go through its decay process. A radioactive element's half-life decay time varies depending on the element. For instance, carbon-10 has a half-life of only 19 seconds, making it impossible to discover in nature. On the other hand, uranium-233 has a half-life of almost 160000 years.
When n half-lives have passed, the formula for estimating the amount still left is:-
A=A°/2^n
where,
A=initial amount
A°=remaining amount
n=t/t_{1/2}
A=150/2^t/30yrs
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A student started with 0.3295 g of copper. The mass of filter paper and copper (II) oxide product was found to be 0.5723 g, and that of the filter paper alone was 0.2568 g. Calculate the percent yield of copper (II) oxide.
The percent yield will be 95.75%
Percent yieldMass of copper = 0.3295 g
Mass of filter paper + copper (II) oxide = 0.5723
Mass of filter paper only = 0.2568
Mass of copper (II) oxide = 0.5723 - 0.2568 = 0.3155
Percent yield = yield/total x 100%
= 0.3155/0.3295 x 100% = 95.75%
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Life alters the atmosphere by producing and removing _____________________, carbon dioxide, and methane.
Life alters the atmosphere by producing and removing oxygen, carbon dioxide, and methane.
Burning fossil fuels like coal, and natural gas, including oil, solid waste, trees, and other biological materials release carbon dioxide into the atmosphere, along with some chemical reactions.
It is thought that the first billion years of Earth's history saw a lot of volcanic activity. With little to no oxygen, the early atmosphere was presumably primarily composed of carbon dioxide.
Therefore, life alters the atmosphere by producing and removing oxygen, carbon dioxide, and methane.
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Blood alcohol concentration (bac) is defined as the ration of alcohol in the system to?
Blood Alcohol Concentration (BAC) is defined as the ratio of alcohol in the system to Blood in the system.
Blood/Breath Alcohol concentration (BAC) is the quantity of alcohol within the bloodstream or on one's breath. BAC is expressed because of the weight of ethanol, in grams, in 100 milliliters of blood, or 210 liters of breath. BAC can be measured with the aid of breath, blood, or urine exams.
Blood alcohol content material shows the percentage of alcohol that is in a person's bloodstream. BAC is crucial to prosecutors because they accept it as true with it displays how tons an individual is impaired via alcohol.
Human beings making their own alcoholic beverages regularly calculate the percentage of alcohol by way of extent by way of measuring their relative density with a hydrometer or their sugar content material with a refractometer.
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In Keq expressions, "[]" represents of reactants and products.
a)concentration
b)temperature
c)moles
d)mass
Answer: concentration
Explanation:
This is a fact.
Calcium (Ca) and diatomic oxygen (O2) combine to form calcium oxide (CaO). The data table below compares the properties of these substances.
Calcium (Ca) Oxygen (O2) Calcium Oxide (CaO)
Melting Point (°C) 842 −218.4 2613
Density (g/cm3) 1.54 0.00143 3.34
Appearance silvery-white
metal colorless,
odorless gas white, odorless
powder
What can be concluded from this data?
A.
A chemical reaction occurred because calcium oxide has different properties than calcium and diatomic oxygen.
B.
A chemical reaction did not occur because solid calcium cannot chemically react with diatomic oxygen gas.
C.
A chemical reaction did occur because calcium oxide has similar properties to calcium and diatomic oxygen.
D.
A chemical reaction did not occur because calcium oxide is not a new substance.
A chemical reaction occurred because calcium oxide has different properties than calcium and diatomic oxygen. The correct option is A.
What are chemical reactions?A chemical reaction is said to occur when the chemical properties of substances change during the course of the reaction.
From the illustration, the chemical properties of calcium oxide are unique from that of calcium and oxygen. Thus, calcium oxide has become a new substance entirely.
Once a reaction leads to the formation of new substances, such a reaction is a chemical reaction.
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which of these attacking reagent is an electrophile 1:HNO3 2:Nh3 3:Br- 4: H+
The attacking reagent which is an electrophile is H+; option D.
What are electrophiles?Electrophiles are electron-loving reagents which attack and attach to electron-rich reagents.
Electrophiles usually are positively charged reagents.
Therefore, the attacking reagent which is an electrophile is H+.
In conclusion, electrophiles are electron-loving reagents.
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Which answer best describes what is happening in the following reaction?
2C8H18 + 25O2 Right arrow. 16CO2 + 18H2O
This is not a redox reaction. It is an example of combustion.
This is a redox reaction in which octane (C8H18) is the reducing agent.
This is a redox reaction in which carbon dioxide (CO2) burns due to ignition.
This is not a redox reaction, because a solution of carbon dioxide and water results.
A. This is not a redox reaction. It is an example of combustion.
Combustion reaction of hydrocarbonDuring the combustion of a hydrocarbon, the hydrocarbon reacts with oxygen to create carbon dioxide, water, and heat.
Example of combustion reaction2C8H18 + 25O2 → 16CO2 + 18H2O
Thus, we can conclude that, this is not a redox reaction. It is an example of combustion.
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Answer:
A: This is not a redox reaction. It is an example of combustion.
Explanation:
Which of the following measurements
have four significant figures? Select all
that apply.
1.001
120.0
Explanation:Significant figures are used in science to determine the precision of a number. Depending on the decimal point, sig figs are counted in different ways.
Decimal Points
When counting sig figs, you always start at the first non-zero number. However, sometimes you start from the left, other times the right.
If the decimal point is present, start counting sig figs from the left.If the decimal point is absent, start counting sig figs from the right.Remember to start counting at the first non-zero number.
For people in the Americas, there is a trick to remembering this.
If this decimal is Present, start from the Pacific. If it is Absent, start from the Atlantic.This works because the Pacific ocean is to the left of the Americas, and the Atlantic is to the right.
4 Significant Figures
The number 1.001, has 4 significant figures. Since there is a decimal point, we start counting from the left. The first digit is not zero, so we count all four places as significant.
The number 120.0 also has 4 sig figs. Like the number above, we start counting from the left because of the decimal. The first digit on the left is not zero, so we once again count all 4 digits as significant.
Chemical A has a toxicity level of 1 and chemical B has a toxicity level of 2. If a mixture of the two chemicals has a toxicity level of 3, what can we say about the results of the mixture
If chemical A has a toxicity level of one and chemical B has a toxicity level of two and the mixture of these two chemicals has a toxicity level of three, it means that the mixture of these two chemicals form a synergistic mixture. This is condition is known as synergism.
A synergistic effect is exerted when a greater effect is exerted than the added effect of both the chemicals together. This is applicable for toxic chemicals as well as non-toxic chemicals. Synergism can be dangerous in the case of both toxicology or chemicals in general. The greater effect of toxic chemicals can result in a dangerous mixture, which could prove to have fatal effects in many cases. The opposite of synergistic effect is antagonistic effect. The antagonistic effect is the effect where the overall effect of these two chemicals would be less than the sum of the effects imparted by the individual chemicals.
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Please help me!!!!!!!!!!!!!
1)The limiting reactant will be aluminum acetate
2) The mass of aluminum hydroxide formed will be 9.75 grams.
Stoichiometric problemThe equation of the reaction is as below:
[tex]Al(C_2H_3O_2)_3 + 3NaOH --- > 3C_2H_3NaO_2 + Al(OH)_3[/tex]
The mole ratio of the 2 reactants is 1:3.
Mole of 100 mL. 1.25 mol/L [tex]Al(C_2H_3O_2)_3[/tex] = 0.1 x 1.25 = 0.125 mol
Mole of 300 mL, 2.30 mol/L NaOH = 0.3 x 2.3 = 0.69 mol
Thus, aluminum acetate is limited.
Mole ratio of [tex]Al(C_2H_3O_2)_3[/tex] and [tex]Al(OH)_3[/tex] = 1:1
Equivalent mole of [tex]Al(OH)_3[/tex] = 0.125 mol
Mass of 0.125 mole [tex]Al(OH)_3[/tex] = 0.125 x 78 = 9.75 grams.
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Will give u brainliest!!!
part e
drop a single crystal of sodium acetate into the flask. observe the contents of the flask. what happens to the sodium acetate solution in the flask after you drop in the crystal?
Answer:
I dropped a crystal of sodium acetate into the solution it immediately became cloudy again, it became supersaturated.
Explanation:
I used this and scored 100% but if you copy and paste they will flag you for plagiarsm so make sure to rewrite it in your own words.
I dropped a crystal of sodium acetate into the solution it immediately became cloudy again, it became supersaturated.
What is Sodium acetate solution?Chemically known as CH3COONa, sodium acetate is a hygroscopic powder that is very water soluble. The addition of sodium acetate to products like heating pads, food, industries, and concrete is possible.
When administered intravenously, sodium acetate plays a critical role in medicine as an electrolyte replenisher. It is mostly recommended to treat hyponatremic patients' sodium levels. Additionally, it can be used to alkalinize urine and treat metabolic acidosis.
In patients with limited or no oral intake, salt should be added to high volumes of intravenous fluids to prevent or treat hyponatremia. for the patient's needs cannot be addressed by conventional electrolyte or nutrient solutions, it is also helpful as an addition for creating customized intravenous fluid formulas.
Therefore, I dropped a crystal of sodium acetate into the solution it immediately became cloudy again, it became supersaturated.
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how do protons determine the identity of an atom
Explanation:
Proton is one of the subatomic particles which has a positive charge. The number of protons present will give the atomic number of the chemical element. Every element will have a unique atomic number. Thus, we can say that protons will determine the identity of an element.
Hat product forms at the anode during the electrolysis of molten nabr?
a. Na+ (l) Na(l).
b. Br–(l).
c. Br^3–(I).
d. Br^2(g).
Reaction at anode
2 Br- (aq) -----> Br2 (g) + 2e-
The product formed at the anode is Br2 (g).
In chemistry and production, electrolysis is a technique that makes use of direct electric present-day (DC) to power an otherwise non-spontaneous chemical response.
Electrolysis is commercially crucial as a degree inside the separation of factors from clearly going on sources including ores the usage of an electrolytic cell.
The voltage that is wanted for electrolysis to occur is called the decomposition capacity. The word "lysis" way to split or break, so in phrases, electrolysis would imply "breakdown via power".
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Listed following are some distinguishing characteristics of comets, meteors, and asteroids. Match these to the appropriate category of objects.
The distinguishing characteristics of comets, meteors, and asteroids are its composition.
What are the characteristics of comets, meteors and asteroids?Asteroids are the fragments of rock that were left over from the creation of the solar system, Meteors are the rocks that enter the atmosphere of the Earth from space while on the other hand, Comets are the remnants of the formation of the solar system that are made of dust, rocks, and ice. All these materials i.e. comets, meteors and asteroids are different from one another due to its structure and chemical composition.
So we can conclude that the distinguishing characteristics of comets, meteors, and asteroids are its composition.
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A diprotic acid is titrated with a strong base. The pH at the first half-equivalence point is 3.27. The pH at the second half-equivalence point is 8.53. What is the value of ka2
A diprotic acid is titrated with a strong base. The pH at the first half-equivalence point is 3.27. The pH at the second half-equivalence point is 8.53. The value of ka2 is 27.89.
What is pH ?pH is used to measure whether the substance is acidic, basic or neutral and the range is 0-14. If the pH is less than 7 then the solution is acidic in nature. if the pH is more than 7 then the solution is basic in solution. If the pH is equal to 7 then the solution is neutral in nature.
How to find the polyprotic value ?To find the polyprotic value
[tex]K_{a_2}[/tex] = pH of first half equivalence point × pH of second half equivalence point
[tex]K_{a_2}[/tex] = 3.27 × 8.53
= 27.89
Thus from the above conclusion we can say that A diprotic acid is titrated with a strong base. The pH at the first half-equivalence point is 3.27. The pH at the second half-equivalence point is 8.53. The value of ka2 is 27.89.
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What happens to iron in a bolt as the bolt rusts?
Answer:
write the following as fractions in their simplest form
A certain mass of nitrogen gas occupies a volume of 8.56 L at a pressure of 3.72 atm. At what pressure will the volume of this sample be 10.94 L
The final pressure of the nitrogen gas with the increase in volume is 2.91 atm.
What is Boyle's Law?Boyle’s law is a gas law that states that the pressure exerted by a gas (of a given mass, kept at a constant temperature) is inversely proportional to the volume occupied by it.
The relation can be given as:
[tex]P_1V_1=P_2V_2[/tex]
The initial pressure of the gas, [tex]P_1[/tex] = 3.72 atm
The initial volume of the gas, [tex]V_1[/tex] = 8.56L
The final volume of the gas, [tex]V_2[/tex] = 10.94 L
Substituting the values, the final pressure [tex]P_2[/tex] is given as:
3.72 × 8.56 = [tex]P_2[/tex] × 10.94
[tex]P_2 =\frac{3.72 * 8.56}{10.94} \\\\P_2 =2.91 atm[/tex]
Therefore, the final pressure of the nitrogen gas with the increase in volume is 2.91 atm.
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a group of atoms of more than one elements forms
Considering the definition of chemical compounds, a group of atoms of more than one elements forms chemical compounds.
What is a chemical compoundChemical Compounds are substances that are made up of a minimum of 2 elements that have reacted with each other to give another substance different from the initial elements. Elements are held together by what is known as a chemical bond.
In other words, a chemical compound is any substance formed by the union of two or more types of chemical elements, that is, by atoms of two or more different types of chemical elements, joined together by chemical bonds in certain proportions.
A chemical compound can be separated into its constituent elements by chemical reactions.
SummaryIn summary, a group of atoms of more than one elements forms chemical compounds.
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At a particular temperature, the solubility of He in water is 0.080 M when the partial pressure is 1.7 atm. What partial pressure (in atm) of He would give a solubility of 0.200 M
At a particular temperature, the solubility of He in water is 0.080 M when the partial pressure is 1.7 atm. 4.25 atm is the partial pressure of He would give a solubility of 0.200 M.
What is Henry's Law ?Henry's Law is a gas law states that at a constant temperature the amount of gas that dissolved in a liquid is directly proportional to the partial pressure of that gas.
What is relationship between Henry's Law constant and Solubility ?The solubility of gas is directly proportional to partial pressure.
It is expressed as:
[tex]S_{\text{gas}} = K_{H} P_{\text{gas}}[/tex]
where,
[tex]S_{\text{gas}}[/tex] = Solubility of gas
[tex]K_{H}[/tex] = Henry's Law constant
[tex]P_{\text{gas}}[/tex] = Partial pressure of gas
Now put the values in above expression we get
[tex]S_{\text{gas}} = K_{H} P_{\text{gas}}[/tex]
0.080M = [tex]K_{H}[/tex] × 1.7 atm
[tex]K_{H} = \frac{0.080\ M}{1.7\ \text{atm}}[/tex]
= 0.047 M/atm
Now we have to find the partial pressure of He
[tex]S_{\text{gas}} = K_{H} P_{\text{gas}}[/tex]
0.200 M = 0.047 M/atm × [tex]P_{\text{gas}}[/tex]
[tex]P_{\text{gas}} = \frac{0.200 M}{0.047\ \text{M/atm}}[/tex]
= 4.25 atm
Thus from the above conclusion we can say that At a particular temperature, the solubility of He in water is 0.080 M when the partial pressure is 1.7 atm. 4.25 atm is the partial pressure of He would give a solubility of 0.200 M.
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EXPERIMENT 1: How do you expect your coarse titration volume at the color change to compare to your fine titration volumes?
In the endpoint when the indicator changes color it gives the information that the acid is neutralized by the base.
What is Titration ?Titration is also known as titrimetry is a technique where a solution of known concentration is used to calculate the concentration of the unknown solution. Titration is a laboratory technique.
What is Endpoint ?The point at which the indicator changes the color is known as Endpoint.
Thus from the above conclusion we can say that In the endpoint when the indicator changes color it gives the information that the acid is neutralized by the base.
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Assume that helium behaves as an ideal gas. what is the estimated density of 1.0 g of helium gas at a temperature of 27 °c and a pressure of 3.0 atm? (note: use r = 0.0821 l∙atm∙mol−1∙k−1)
The density of the helium gas is 0.487 g/L
Calculation,
According to Ideal gas equation,
PV = nRT ...(I)
The values of some terms are given as,
P is the pressure = 3 atm
V is the volume = ?
T is the temperature = 27°C = 27°C + 273 = 300 K
R is the universal gas constant = 0.0821 L∙atm∙mol−1∙K−1
n is the number of moles of helium = given mass of helium/molar mass of helium
n is the number of moles of helium = 1 g/ 4 g/mole = 0.25 mole
So, by putting the value of all data given in the equation (i) we get,
3 atm × V = 0.25 mol ×0.0821 L∙atm∙mol−1∙K−1×300 K
V = 0.25 mol ×0.0821 L∙atm∙mol−1∙K−1×300 K/3 atm
V = 2.05 L
The formula of density = given mass /volume = 1g/2.05 L = 0.487 g/L
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A molecule that contains delocalized electrons ________
Answer:
benzene molecule
Explanation:
The molecules exhibiting delocalization of electrons will have at least two resonance structures. These two resonance structure are having the equal energy.
What is resonance?Resonance is an electronic property of molecules by which, the sigma bond or pi bond moves from one location to other forming different mesomeric structures of the compound.
For example carbon dioxide can have two resonance structures.The lone pair in oxygen delocalize from one oxygen to the other. The double bond with carbon can be of either side of carbon. Thus one negative charge forms for one oxygen. This charge can be on the second hydrogen too.
In this way free electrons can delocalise through the orbitals and this process make the molecule more stable. The resonance structures together form the canonical structure which is the most probable and stable form of the compound.
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state and appearance sodium chloride
Sodium chloride is white, crystalline solid at room temperature.
Sodium chlorideIt is a compound whose components atoms are sodium and chlorine.
The atoms of the two elements combine chemically through an ionic bond. The sodium donates it valence electron to the chlorine atom.
Thus, sodium chloride is an ionic compound. It has a characteristic white appearance and crystalline structure.
The compound is a solid at room temperature. It has a melting point of 801 °C.
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About how long does it take for the reaction to reach equilibrium in this concentration versus time graph?
a graph of reactant and product concentration vs. time; a red curve shows the reactant concentration decreasing while two blue curves show the product concentration increasing with time; both blue curves intersect the red curve; the chemical equation is water reacting to produce hydrogen and oxygen
A.
0.5 second
B.
1.5 seconds
C.
2.5 seconds
D.
4.5 seconds
The time taken for the reaction to reach equilibrium in this concentration versus time graph is 4.5 seconds and is denoted as option D.
What is Time?This refers to the duration in which a certain action or activity takes place with its unit being seconds.
From the graph we can deduce that:
The two blue lines, the concentrations of H₂ and O₂, become flat between 4 and 5 seconds.The red line, the concentration of H₂O, becomes flat, also, between 4 and 5 seconds.This therefore means that the time taken for the reaction to reach equilibrium in this concentration versus time graph is 4.5 seconds.
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Answer: 4.5 is right just took the test.
Explanation:
Two trains, A and B are moving at a speed of 20 km per hour
and 30 km per hour respectively. Which type of energy do
these two trains have?
Answer:
[tex]\fbox {kinetic motion}[/tex]
Explanation:
As the trains are clearly in motion, we can understand the these trains possess kinetic energy, which is by virtue of a motion of a body.
Answer:
type of energy that two train have are kinetic energy
Consider the following equation in chemical equilibrium. C2H4(g) H2(g) C2H6(g) 137 kJ What happens to the amount of ethane (C2H6) when the temperature of the system is increased
The amount of ethane decreases
increasing the temperature (adding energy), will drive the reaction to the left
What happens to the amount of ethane (C2H6) when the temperature of the system is increased ?C2H4(g) <--> C2H6(g) + 137 kJ
because this reaction is an exothermic reaction and the heat is a product of this reaction, So when the number of temperature increases
so (more heat will be added) so the reaction will go leftward (toward reactants ) so the amount of C2H4 & H2 will increase and the amount of ethane C2H6 will decrease.Learn more about Chemical Equilibrium here:
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The solubility of pbso₄ in water at 25 °c is 7. 9 × 10⁻⁴ m. What is ksp for pbso₄?.
ksp = 2S²
= 2 [ 7.9* 10-⁴ moldm-³ ]²
= 124.82 * 10-⁸ mol² dm-⁶
The term Ksp denotes the solubility product. It is generally used to predict the precipitation of reactions. The Ksp of PbSO₄ is 6.24 × 10⁻⁷.
What is solubility product?The solubility product of a sparingly soluble salt is defined as the product of the molar concentrations of its ions in a saturated solution of it at a given temperature. By knowing the solubility product of a substance, it is possible to predict whether a substance precipitate out or not.
In short, the precipitation of an ionic substance from the solution occurs when the ionic product exceeds the value of its solubility product at that temperature.
Here PbSO₄ dissociates as:
PbSO₄ → Pb²⁺ (aq) + SO₄²⁻ (aq)
Ksp = [Pb²⁺] [SO₄²⁻ ]
= [7. 9 × 10⁻⁴] [7. 9 × 10⁻⁴]
= 6.24 × 10⁻⁷
Thus the value of Ksp is 6.24 × 10⁻⁷.
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Which answer best describes what is happening in the following reaction?
2C8H18 + 25O2 Right arrow. 16CO2 + 18H2O
This is not a redox reaction. It is an example of combustion.
This is a redox reaction in which octane (C8H18) is the reducing agent.
This is a redox reaction in which carbon dioxide (CO2) burns due to ignition.
This is not a redox reaction, because a solution of carbon dioxide and water results.
The statement that best describes what is happening in the following reaction is this is not a redox reaction, It is an example of combustion (option A).
What is a combustion reaction?A combustion reaction is a reaction wherein a substance is combined with oxygen, usually at high temperature, releasing heat.
According to this question, octane undergoes a combustion reaction to produce carbon dioxide and water as follows: 2C8H18 + 25O2 = 16CO2 + 18H2O
Therefore, the statement that best describes what is happening in the following reaction is this is not a redox reaction, It is an example of combustion.
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Answer:
A: This is not a redox reaction. It is an example of combustion.
Explanation:
What mass of oxygen gas (o2) should occupy a 25. 0 l container when the pressure is 665 torr and the temperature is 55. 0ºc?
The mass of oxygen gas is 26.0 g.
Given,
Volume (V) = 25.0 L
665
Pressure (P) = 665 torr =
760 atm = 0.875 atm
Temperature (T) = 55 C = (55+2730) K = 328 K
Now using the Ideal gas law, calculate the mole of oxygen gas (02)
PV = nRT
atm . L
0.875 atm x 25.0 L = n x 0.082-
X 328K
mole . K
n = 0.813 mole
Using the molar mass of Oz = 32.0 g/mole, Calculate the mass of Oz
mass = 0.813 mole x 32.0 mole
mass = 26.016 g
mass = 26.0 g
The answer is 26.0 g.
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When 30.0 g of carbon is heated with silicon dioxide, 28.2 g of carbon monoxide is produced. What is the percent yield of carbon monoxide for this reaction? SiO₂(s) + 3C(s) SiC(s) + 2CO(g)
Answer: 60.5%
Explanation:
When 30.0 g of carbon is heated with silicon dioxide, 28.2 g of carbon monoxide is produced. 60.5% is the percent yield of carbon monoxide for this reaction.
The % ratio of the theoretical yield to the actual yield is known as the percent yield. It is calculated as the theoretical yield times by 100% divided by the experimental yield. The percent yield equals 100% if the theoretical and actual yields are equal.
SiO₂(s) + 3C(s)→ SiC(s) + 2CO(g)
moles of carbon =30.0 / 12=2.5moles
3 moles of carbon give 1 moles of SiC
1 mole of carbon will give 1/3 moles of SiC
2.5 mole of carbon will give (1/3)×2.5 =0.83 moles of SiC
mass of SiC = 0.83× 40.09=33.27
percent yield = (actual yield/theoretical yield) x 100%
percent yield= (28.2 / 33.27)x 100%
percent yield = 60.5%
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