Answer: The average atomic mass of Strontium is 87.65 u
Explanation:
Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.
Formula used to calculate average atomic mass follows:
[tex]\text{Average atomcic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i[/tex] .....(1)
For [tex]_{38}^{86}\textrm{Sr}[/tex] isotope:Mass of [tex]_{38}^{86}\textrm{Sr}[/tex] isotope = 85.91 u
Percentage abundance of [tex]_{38}^{86}\textrm{Sr}[/tex] isotope = 9.46 %
Fractional abundance of [tex]_{38}^{86}\textrm{Sr}[/tex] isotope = 0.09460
For [tex]_{38}^{87}\textrm{Sr}[/tex] isotope:Mass of [tex]_{38}^{87}\textrm{Sr}[/tex] isotope = 86.91 u
Percentage abundance of [tex]_{38}^{87}\textrm{Sr}[/tex] isotope = 7.00 %
Fractional abundance of [tex]_{38}^{87}\textrm{Sr}[/tex] isotope = 0.0700
For [tex]_{38}^{88}\textrm{Sr}[/tex] isotope:Mass of [tex]_{38}^{88}\textrm{Sr}[/tex] isotope = 87.91 u
Percentage abundance of [tex]_{38}^{88}\textrm{Sr}[/tex] isotope = 83.54 %
Fractional abundance of [tex]_{38}^{88}\textrm{Sr}[/tex] isotope = 0.8354
Putting values in equation 1, we get:
[tex]\text{Average atomic mass of Sr}=[(85.91\times 0.0946)+(86.91\times 0.0700)+(87.91\times 0.8354)][/tex]
[tex]\text{Average atomic mass of Sr}=87.65u[/tex]
Hence, the average atomic mass of Strontium is 87.65 u
If exactly 50 ml of a 0.050m solution of hydrochloric acid is added to exactly 50 ml of 0.050m ammonia, what is the ph of the resulting solution?
The equilibrium constant kc for the decomposition of phosgene, cocl2, is 4.63 10-3 at 527°c. cocl2(g) equilibrium reaction arrow co(g) + cl2(g) calculate the equilibrium partial pressure of all the components, starting with pure phosgene at 0.760 atm.
To determine the equilibrium partial pressures for the components of phosgene decomposition, we first establish the initial conditions and use the given equilibrium constant. We then set up an equation based on the changes at equilibrium and solve it to find the equilibrium partial pressures.
Explanation:Equilibrium Partial Pressure of Phosgene Decomposition ComponentsThe decomposition of phosgene (COCl2) into carbon monoxide (CO) and chlorine gas (Cl2) can be observed using the equation COCl2(g) ⇌ CO(g) + Cl2(g). From the problem, we can consider an initial pressure of 0.760 atm of COCl2 and a negligible amount of CO and Cl2. Given that the equilibrium constant (Kc) for this reaction is 4.63 x 10-3, we can set up an equation derived from the equilibrium expression: Kc = (PCO x PCl2)/PCOCl2.
As the reaction proceeds, the pressure of COCl2 decreases by an 'x' amount to establish equilibrium, and the pressure of CO and Cl2 increases by the same 'x' amount. Thus, at equilibrium: Kc = ((0.760-x)x)/x. Solving this equation for 'x', we can obtain the equilibrium partial pressure of all components in the system.
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What type of polymer is made by bonding an alkene to one or more alkanes or alkenes?
an addition polymer, because your continuing the chain
Will medal!!!
The addition of hydrochloric acid to a silver nitrate solution precipitates silver chloride according to the reaction:
AgNO3(aq)+HCl(aq)→AgCl(s)+HNO3(aq)
When you combine 70.0mL of 0.185M AgNO3 with 70.0mL of 0.185M HCl in a coffee-cup calorimeter, the temperature changes from 23.16∘C to 24.25∘C.
Calculate ΔHrxn for the reaction as written. Use 1.00 g/mL as the density of the solution and C=4.18J/g⋅∘C as the specific heat capacity.,
Which of the following is a characteristic of most non-metals and is not a characteristic of most metals?
A. Replaces the hydrogen in acids to form stable compounds
B. Is malleable and ductile
C. Has a negative charge when a current is run through its solution
D. Can conduct electricity and heat
Answer: Option (C) is the correct answer.
Explanation:
Non-metals are the substances which gain electrons in order to gain stability and hence they form anions.
Some properties of non-metals are as follows.
Non-metals are bad conductors of heat and electricity. They are brittle in nature.Non-metals have non-shiny surface.But non-metals when gain an electron they they acquire a negative charge. Hence, when non-metal is present in ionic form in a solution then it is able to conduct electricity.
Thus, we can conclude that has a negative charge when a current is run through its solution is a characteristic of most non-metals and is not a characteristic of most metals.
for: rate=k[A]^x determine the value of x if the rate doubles when [A] is doubled; and if the rate quadruples when [A] is doubled.,
To determine the value of x in the rate law expression rate = k[A]^x we set up equations based on the given conditions and solve for x. However, the provided conditions imply two different values for x which suggests a misunderstanding since the reaction order cannot have two different values under the same conditions.
Explanation:The question is asking to determine the value of x in the rate law expression rate = k[A]^x given that the rate doubles when the concentration of A is doubled and the rate quadruples when the concentration of A is doubled. This can be determined by substituting the given conditions into the rate law expression and solving for x.
For the first condition, when [A] is doubled, the rate doubles. This means if the initial rate is R with an initial concentration [A], the rate with 2[A] will be 2R. Plugging this into the rate law, we get: 2R = k(2[A])^x. Dividing both sides by R we get 2 = 2^x, which implies that x = 1.
For the second condition, we are told if [A] is doubled, the rate quadruples. So, we expect 4R = k(2[A])^x. By the same reasoning, 4 = 2^x, which gives us x = 2.
However, this presents a contradiction since we cannot have an x equal to 1 and an x equal to 2 at the same time. Therefore, it's possible that some additional information is missing or has been misinterpreted. The scenario where the rate doubles or quadruples accordingly implies that the order x is directly proportional to the factor by which the rate increases. Based on the conditions provided, two different orders are suggested which is not possible for a single reaction under the same conditions.
Can can someone lease check my answers and tell me if im right???
You have four fixed-volume containers at STP. Container A has 0.5 mol of gas in 11.2 L. Container B has 2 mol of gas in 22.4 L. Container C has 1 mol of gas in 22.4 L. Container D has 2 mol of gas in 11.2 L. Which of the four containers have equal pressures?
(Points : 3)
A and C
A and B
B and C
C and D
*****MY answer is A
Sulfur reacts with oxygen to form sulfur dioxide (so2(g), hf = –296.8 kj/mol) according to the equation below. what is the enthalpy change for the reaction? use . –593.6 kj –296.8 kj 296.8 kj 593.6 kj
Sulfur reacts with oxygen to form sulfur dioxide (SO₂(g), hf = –296.8 kj/mol) according to the equation below. The enthalpy change for the reaction is –296.8 kj.
What is enthaply?It is a thermodynamic quantity that is equal to the total heat content of a system. It is equal to the internal energy of the system plus the product of pressure and volume.
Enthalpy is nothing but energy and they are of 4 types in thermodynamics-
1. Internal Energy, U
2. Heat enthalpy, H
3. Helmholtz enthalpy, A
4. Gibb's Free enthalpy, G
The total energy of a system cannot be measured directly because the internal energy contains components that are unknown, not easily accessible, or are not of interest in thermodynamics.
Enthalpy change for reaction = Enthalpy of formation of SO₂ - Enthalpy of formation of O₂
Enthalpy of formation of O₂ = 0
Therefore, Sulfur reacts with oxygen to form sulfur dioxide (SO₂(g), hf = –296.8 kj/mol) according to the equation below. The enthalpy change for the reaction is –296.8 kj.
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#1: Which element has the same number of valence electrons as hydrogen (H)?
A. helium (He)
B. oxygen (O)
C. nitrogen (N)
D. lithium (Li)
***my answer: D. lithium (Li)
is that right?
Hydrogen and lithium both have one valence electron, causing them to behave similarly in chemical reactions. Hence, lithium is the correct answer.
Explanation:The number of valence electrons an element has determines its behavior in chemical reactions. Hydrogen (H) has one valence electron in its outermost energy level. Looking at the given options, the correct answer is D. lithium (Li).
Just like hydrogen, lithium also has one valence electron in its outermost energy level, which causes it to behave similarly in chemical reactions to hydrogen. The other options - helium (He) has two valence electrons, oxygen (O) has six, and nitrogen (N) has five, so none of these elements behave like hydrogen in chemical reactions.
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what is a saturated solution in your own words, please!!!!
Answer:
A saturated solution is a solution that has the maximum amount of solute that is capable of being dissolved
Explanation:
The combustion of titanium with oxygen produces titanium dioxide: ti (s) + o2(g) â tio2 (s) when 1.000 g of titanium is combusted in a bomb calorimeter, the temperature of the calorimeter increases from 25.00 °c to 60.00 °c. in a separate experiment, the heat capacity of the calorimeter is measured to be 9.84 kj/k. the heat of reaction for the combustion of a mole of ti in this calorimeter is ________ kj/mol.
Answer:
The heat of reaction for the combustion of a mole of Ti in this calorimeter is -16,557.69 kJ/mol.
Explanation:
Mass of titanium = 1.000 g
Moles of titanium =[tex]\frac{1 g}{47.87 g/mol}=0.0208 mole[/tex]
Heat capacity of the calorimeter ,c= 9.84 kJ/K
Initial temperature of the calorimeter ,T=25°C =298 K
Final temperature of the calorimeter ,T'= 60°C = 333 K
Heat gained by calorimeter = q
[tex]q=c\times \Delta T= 9.84 kJ/K\times(333K-298 K)=344.4 kJ[/tex]
Heat of combustion released when 1 g of titanium = -344.4 kJ
Heat if released that is why negative sign is used.
In 1 g of titanium = 0.0208 mole
Heat of combustion of 0.0208 moles of titanium = -344.4 kJ
Heat of combustion of 1 moles of titanium:
[tex]\frac{-344.4 kJ}{0.0208}=-16,557.69 kJ[/tex]
The heat of reaction for the combustion of a mole of Ti in this calorimeter is -16,557.69 kJ/mol.
A chemical that will ignite spontaneously in air at a temperature of 130 degree fahrenheit (54.4 degree celsius) or below is identified by the term _____.
If 3.0×105 j of heat are added to the ice, what is the final temperature of the system?
How can you determine the number of moles of a contained gas when the pressure, volume, and temperature are known values?
Under STP conditions (1 atm and 0°C), 1 mole of an ideal gas occupies 22.4 liters.
The Ideal Gas Law is a fundamental equation that relates the pressure (P), volume (V), and temperature (T) of an ideal gas to the number of moles (n) of the gas. The law is expressed by the equation:
[tex]\[ PV = nRT \][/tex]
where:
- [tex]P[/tex] is the pressure of the gas, typically measured in atmospheres (atm),
- [tex]V[/tex] is the volume of the gas, usually measured in liters (L),
- [tex]n[/tex] is the number of moles of the gas,
- [tex]\( R \)[/tex] is the ideal gas constant, which has a value of 0.0821 L·atm/(mol·K) when the pressure is in atm and the volume is in liters, and
- [tex]\( T \)[/tex] is the temperature of the gas in Kelvin (K).
To find the number of moles [tex]n[/tex], we can rearrange the Ideal Gas Law equation to solve for [tex]n:[/tex]
[tex]\[ n = \frac{PV}{RT} \][/tex]
For example, if we have a gas at a pressure of 1 atm, a volume of 22.4 L (which is the molar volume of an ideal gas at STP), and a temperature of 273 K (0°C), we can calculate the number of moles as follows:
[tex]\[ n = \frac{(1 \text{ atm})(22.4 \text{ L})}{(0.0821 \text{ L·atm/(mol·K)})(273 \text{ K})} \][/tex]
[tex]\[ n = \frac{22.4}{0.0821 \times 273} \][/tex]
[tex]\[ n \approx 1 \text{ mol} \][/tex]
This calculation confirms that under STP conditions (1 atm and 0°C), 1 mole of an ideal gas occupies 22.4 liters.
How to calculate C02 molecules in 5.24x10 -2?
What happens to the concentration of the reactants and products during the course of a forward chemical reaction
During photosynthesis, plants absorb energy from sunlight, they take in water from the soil using their roots, and they take in carbon dioxide from the atmosphere. What is produced in the leaves of plants, in addition to oxygen?
Answer:
Sugar
Explanation:
Sugar Transport. Sugars, which are formed by the plant during photosynthesis, are an essential component of plant nutrition. Like water, sugar (usually in the form of sucrose, though glucose is the original photosynthetic product) is carried throughout the parts of the plant by the vascular system. Welcome.
Write a balanced chemical equation depicting the formation of one mole of h2o2(g) from its elements in their standard states. express your answer as a chemical equation. identify all of the phases in your answer.
What is most plastic made of?
SELECT ALL THAT APPLY
- inorganic compounds
- organic compounds
- petroleum or coal materials
- carbon containing compounds
- synthetic materials
The plastic is a polymer. A polymer is defined as a substance which is made from the monomers. The plastic is made of petroleum or coal materials. The correct option is D.
What is plastic?The wide range of synthetic or semi synthetic materials which use polymers as a main ingredient is defined as the plastic. The property plasticity makes it possible for the plastics to be moulded or pressured into objects of various shapes.
Most of the modern plastics are from the fossil fuel based chemicals such as natural gas or petroleum. The raw materials like natural gas, oil or plants are refined into ethane and propane. Both of these molecules are subjected to a process called cracking.
As a result of cracking, ethane and propane changes into ethylene and propylene. These materials are combined to form many polymers.
Thus the correct option is D.
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A student is told that both energy and mass must be conserved in every chemical reaction. She measures the mass of Hydrochloric acid and a zinc strip separately. She then places the zinc strip into the acid and bubbles form as the zinc looks like it disappears. The combined mass afterward is less than the original. Which of these can explain this result? A) The student must have not measured the mass correctly. B) The zinc disappears and therefore the mass is less after the reaction. C) This is not a chemical reaction so the conservation laws do not apply. D) The bubbles indicate that a gas is created and mass is loss as it escapes from the container.
what is the molality of a 10.5% by mass glucose (C6H12O6) the density of the solution is 1.03 g/ml. i got up to m = 0.058281527 mol/ kg... please help !!!!,
When the following equation is balanced with the lowest whole number coefficients possible, what is the coefficient in front of Ca(OH)2? Ca(OH)2 + H3PO3 yields H2O + Ca3(PO3)2
Ans: Lowest coefficient in front of Ca(OH)2 is 3
Given equation:
Ca(OH)2 + H3PO3 → Ca3(PO3)2 + H2O
Reactants: Products:
Ca = 1 Ca = 3
O = 5 O = 7
H = 5 H = 2
P = 1 P = 2
Balanced equation:
3Ca(OH)2 + 2H3PO3 → Ca3(PO3)2 + 6H2O
Why do some molecules begin sticking together when you add in more molecules?
Some molecules begin sticking together when you add in more molecules because like attracts like and opposites repel.
What is molecules?A collection of two and more substances joined through chemical bonds is still referred to as a molecule.
What is like attracts like?like attracts like means It is repulsive when two items with identical charges interact. That is fascinating to watch how two objects with opposing charges interact.
Some molecules begin sticking together when you add in more molecules because like attracts like and opposites repel
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Due to the formation of hydrogen bonds, _____ is highly soluble in water.
Due to the formation of hydrogen bonds, methanol is highly soluble in water.
What is Hydrogen bonding?Hydrogen bonding may be defined as a type of electrostatic force of attraction between a hydrogen atom that is significantly bonded to a more electronegative atom such as Nitrogen, Oxygen, and fluorine. There are generally two types of hydrogen bonding that exist in nature.
Intermolecular Hydrogen bonding: occurs between two separate molecules.Intramolecular Hydrogen bonding: occurs between the two different atoms of the same molecules.The molecules of water typically are polar in nature. Due to this, the hydrogen of one water molecule significantly forms a hydrogen bond with the oxygen of the same or different water molecules.
Water is an extensive framework of hydrogen bonds. This also leads to the methanol solubility in water due to hydrogen bonding between methanol and water molecules.
Therefore, methanol is highly soluble in water, due to the formation of hydrogen bonding.
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Fossils provide evidence that
1) Life on earth millions of years ago was more complex than life is today
2) The changes that will occur in species in the future are easy to predict
3)Many species of organisms that lived long ago are now extinct
4)Most species of organisms that lived long ago are exactly same today
As you read the passage below, highlight all of the biotic factors. Bobby is helping his dad make dinner. They are having steak and boiled potatoes. Bobby’s dad asks him to get the potatoes from the pantry. Bobby cannot reach the shelf, so he uses a wooden stool to stand on. While Bobby’s dad finds a knife to cut the steak, Bobby puts the potatoes in a pot of boiling water. While the steak and potatoes cook, Bobby and his dad set out ceramic dishes on the table and some sour cream for the potatoes
Answer:
A,B,C,E, and H
Explanation:
Unagi
In the passage, the biotic factors are the steak and the potatoes, which are derived from living organisms - an animal and a plant, respectively. Other mentioned items like the wooden stool and ceramic dishes are abiotic factors and, therefore, not highlighted as biotic. The importance of biotic factors, such as potatoes, in ecology and human history is also discussed, including their role in the Irish potato famine.
Explanation:The student has asked to highlight all of the biotic factors in the given passage. In ecology, biotic factors are the living components of an environment, which include organisms from the same or different species. Examples of biotic factors in the scenario provided would be the steak, since it comes from an animal, and the potatoes, as they are plant-based food. Both of these are derived from living organisms, making them biotic factors.
Contrastingly, abiotic factors refer to the non-living components such as sunlight, soil, and water which are also mentioned in the background information provided. The wooden stool, boiling water, and ceramic dishes mentioned in the passage are examples of abiotic factors since they are non-living and do not directly represent former living organisms.
To put it in context, potatoes as mentioned in the scenario, are significant biotic factors in human diets and ecosystems, as they are photosynthetic autotrophs and interact with abiotic factors like soil nutrients, water, and sunlight to grow. The Irish potato famine, caused by late blight of potato (Phytophthora infestans), illustrates the importance of biotic interactions, particularly how diseases can impact plant populations and subsequently human societies.
What type mirror is this?
concave
plane
convex
parabolic
• describe/recognize the molecular structure of water. • define these terms o matter o element o atom • know and be able to define the subatomic particles found in atoms. • define atomic number and atomic mass. • be able to determine the reactivity of an element by how many electrons are in the valence shell. • distinguish between ionic, covalent, polar covalent, nonpolar covalent and hydrogen bonds. • state the difference between a compound and a molecule.
Which term describes the degree to which an element attracts electrons? which term describes the degree to which an element attracts electrons? electronegativity. polarity. oxidation. reduction?
Electronegativity is the term which describes the degree to which an element attracts electrons in a bond. It's different from electron affinity, which involves energy exchange when an isolated atom acquires an electron. More nonmetallic elements, due to their high electronegativities, can form covalent compounds called oxyacids.
Explanation:The term that describes the degree to which an element attracts electrons is known as electronegativity. This is a property of atoms that determines how the shared electrons in a bond are distributed. For example, in a polar covalent bond, the electrons are shifted toward the more electronegative atom, and this atom is the one that acquires a partial negative charge.
There is, however, an important distinction between electronegativity and electron affinity. The electron affinity of an element refers to the energy released or absorbed when an isolated gas-phase atom acquires an electron. But electronegativity involves attraction of electrons within a bond.
High electronegativities are characteristic of the more nonmetallic elements. These elements can form covalent compounds containing acidic -OH groups that are called oxyacids.
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A reaction has an equilibrium constant of 6.5×103 at 298 K. At 764K , the equilibrium constant is 0.44.
Find ΔHorxn for the reaction.,
Using the van't Hoff equation and the provided equilibrium constants at two different temperatures, the enthalpy change (ΔHrxn) of the reaction can be calculated.
Explanation:The student wants to find the change in the heat content, or enthalpy change (ΔHrxn), of a reaction given the equilibrium constants at different temperatures. This can be done through the van't Hoff equation, which relates the equilibrium constant (K) to temperature (T) and enthalpy change (ΔHrxn). Using the provided equilibrium constants at 298 K and 764 K, as well as the constants 55.7 x 103J/mol and 8.314 J/mol K, we can set up and solve the van't Hoff equation to calculate ΔHrxn.
The van't Hoff equation is ln(K2/K1) = (-ΔHrxn/R)(1/T1 - 1/T2), where R is the ideal gas constant (8.314 J/mol K). By rearranging for ΔHrxn, we can input the given values for K1, K2, T1, and T2 to determine the enthalpy change for the reaction.