Answer:
yes and no
Explanation:
If we don't, who knows what they'll do? Remember the stem cell research? that was research that killed an embryo. Then again, that was research, not the entire science itself. Just a limit on WHAT they do would be good.
Ksp= CaSO4 is 7.10 x 10-5 at 25 oC.
Calcium chloride, CaCl2 is a freely soluble salt. When a 0.50 M CaCl2 solution is prepared, the calcium chloride dissolves without establishing an equilibrium: CaCl2(s) ==========> Ca2+(aq) + 2Cl-(aq) In a 0.50 M CaCl2 solution, the concentration of Ca2+ will be 0.50 mol/L. When the CaSO4 is dissolved in this solution, it establishes its usual equilibrium between solid and the ions in solution: CaSO4(s) <----------> Ca2+(aq) + SO42-(aq) However, the presence of CaCl2 in this solution means there will be Ca2+ ions in solution even before the CaSO4 dissolves. What is the molar solubility of CaSO4 in a 0.50 M CaCl2 solution?
4.33 x10-8 mol/L
3.16 x 10-6 mol/L
1.42 x10-4 mol/L
6.33 x 10-2 mol/L
7.35 x 10-1 mol/L
The molar solubility of CaSO4 in a 0.50 M CaCl2 solution is: 3.16 x 10-6 mol/L.
When CaSO4 is dissolved in a 0.50 M CaCl2 solution, the concentration of Ca2+ ions in the solution is already 0.50 mol/L. Therefore, we need to calculate the solubility product constant (Ksp) of CaSO4 at this concentration of Ca2+ ions, which can be expressed as:
Ksp = [Ca2+][SO42-]
To calculate the molar solubility of CaSO4, we need to find the concentration of SO42- ions in solution. Since CaSO4 is a 1:1 electrolyte, the concentration of SO42- ions will also be equal to the concentration of CaSO4 in solution. Therefore:
Ksp = [Ca2+][SO42-] = (0.50 mol/L)(x)
Where x is the molar solubility of CaSO4 in the solution.
Solving for x, we get:
x = Ksp/[Ca2+] = (9.27 x 10-6)/(0.50) = 1.85 x 10-5 mol/L
Thus, the molar solubility of CaSO4 in a 0.50 M CaCl2 solution is 3.16 x 10-6 mol/L.
It is important to note that the presence of CaCl2 in the solution increases the concentration of Ca2+ ions, which decreases the solubility of CaSO4 in the solution.
Therefore, the molar solubility of CaSO4 in a 0.50 M CaCl2 solution is lower than the molar solubility of CaSO4 in pure water.
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helllloooook this makes no sense help me plz
may i ask?
How do you use this app?
For charged particles, how does the strength of the interaction vary in each of the following cases? (Increase or decrease) a. The distance between the charges increases. b. The size of the charge decreases.
In each of the following situations, the intensity of the interaction differs for charged particles.
a. The distance between the charges increases. (decreases)
b. The size of the charge decreases. (increases)
a. The strength of the interaction between charged particles decreases as the distance between them increases. This is because the force between charged particles follows an inverse square law, which means that the force decreases with the square of the distance between the charges. Therefore, as the distance between the charges increases, the force between them decreases and the strength of the interaction decreases.
b. The strength of the interaction between charged particles increases as the size of the charge decreases. This is because the force between charged particles is directly proportional to the magnitude of the charge. Therefore, as the size of the charge decreases the force between the charged particles decreases and the strength of the interaction decreases.
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Use standard enthalpies of formation to calculate the standard enthalpy of reaction for the following reaction:
2 H2S(g) + 3 O2(g) → 2 H2O(l) + 2 SO2(g) ΔH∘rxn
The standard enthalpy of the reaction for the given equation is -863.2 kJ/mol.
The standard enthalpy of the reaction can be calculated by subtracting the sum of the standard enthalpies of the formation of the reactants from the sum of the standard enthalpies of the formation of the products:
ΔH∘rxn = ΣnΔH∘f(products) - ΣmΔH∘f(reactants)
where n and m are the coefficients in the balanced chemical equation, and ΔH∘f is the standard enthalpy of formation.
The standard enthalpy of formation for H2S(g), H2O(l), and SO2(g) can be found in tables as follows:
ΔH∘f(H2S(g)) = -20.2 kJ/mol
ΔH∘f(H2O(l)) = -285.8 kJ/mol
ΔH∘f(SO2(g)) = -296.8 kJ/mol
O2(g) is an elemental form and has a standard enthalpy of formation of 0 kJ/mol.
Using these values and the balanced chemical equation, we can calculate the standard enthalpy of the reaction:
ΔH∘rxn = [2(-285.8 kJ/mol) + 2(-296.8 kJ/mol)] - [2(-20.2 kJ/mol) + 3(0 kJ/mol)]
= -863.2 kJ/mol
Therefore, the standard enthalpy of the reaction for the given equation is -863.2 kJ/mol.
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Match the atomic particles with their characteristics.
1. atomic mass = 4
2. mass of electron; positive charge
3. 100 percent energy; zero mass
4. mass <1; unstable charge (+)
5. electron emitted from the nucleus
alpha
gamma
meson
beta
positron
Answer:
alpha: atomic mass = 4
beta: mass of electron; positive charge
gamma: 100 percent energy; zero mass
positron: mass <1; unstable charge (+)
beta: electron emitted from the nucleus
Note: Mesons are particles composed of a quark and an antiquark and do not fit the descriptions provided.
A 35.0-L steel tank at 20.0?C contains acetylene gas, C2H2, at a pressure of 1.39 atm. Assuming ideal behavior, how many grams of acetylene are in the tank?
Aiming towards ideal conduct The tank holds 52.7 grams of acetylene. Acetylene and oxygen combine to produce carbon dioxide and water when they are near a flame.
Why is C2H2 referred to as "acetylene"?The name, derived from the French word acetylene, was created by French scientist Marcelin-Pierre-Eugène Berthelot. The German chemist Justus von Liebig first named acetic acid in 1839, and it was obtained from the chemical ending ene + acetyl.
When welding, what kind of gas is used?Due to its flame's high temperature and rapid flame propagation, only acetylene is a fuel gas that is suited for gas welding. However, they can be used for cutting, torch brazing, and soldering. Other fuel gases, such as propane, propylene, or natural gas, do not create enough heat input for welding.
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State your claim. Make sure your claim fully explains how infrared photography can be used to visualize temperature differences
My claim is that infrared photography can be used to visualize temperature differences by capturing the infrared radiation emitted by objects and converting it into visible light, with warmer objects appearing brighter and cooler objects appearing darker in the final image. This is because all objects emit some level of infrared radiation, and the amount of radiation emitted increases as the temperature of the object increases. By using a specialized camera that is sensitive to infrared radiation, it is possible to capture these differences in radiation and convert them into visible light, allowing the viewer to see temperature variations in the final image.
can some one help me and say any 2 ice uses of dry ice with explanation
The two uses of dry ice include the following:
Cooling agent in preservation.Accelerated plant growth in agriculture.What is Dry ice?This is defined as a solid form of carbon dioxide and doesn't have a liquid state under normal atmospheric pressure. This is therefore the reason why it undergoes sublimation which involves the direct conversion of the solid phase to the gas phase.
Dry ice is used as a cooling agent in the preservation of substances via refrigeration etc and is also used in agriculture to speed up the growth of plants.
This is because plants need carbon dioxide for their photosynthetic activities and the aforementioned are therefore the appropriate uses of dry ice.
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g a reaction which is exothermic and has an overall increase in entropy is a) spontaneous only at high t b) spontaneous only at low t c) always spontaneous d) spontaneous in the reverse direction.
A reaction which is exothermic and has an overall increase in entropy is
A) spontaneous only at high T
B) spontaneous only at low T
C) always spontaneous
D) spontaneous in the reverse direction.
The correct option is C) i.e., always spontaneous
Spontaneity is determined by the free energy. When ΔGΔG is negative, it is spontaneous.
ΔG=ΔH−TΔSΔG=ΔH−TΔS
The problem indicates that the ΔSΔS is positive. If the reaction is exothermic, this means that the ΔHΔH is negative.
ΔGΔG is going to be negative no matter the temperature.
A spontaneous process is one that occurs on its own, without any energy input from the outside. For example, a ball will roll down an incline; water will flow downhill; ice will melt into water; radioisotopes will decay, and the iron will rust.
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what best describes the required composition of a 5-member iacuc?
The five members that make up the IACUC committee are a Doctor of Veterinary Medicine (DVM) who is a member of the institution, one scientist, one non-scientist, and two members of the institution's community.
The Institutional Animal Care and Use Committee (IACUC) is a board of specialists responsible for inspecting animal treatment facilities and their compliance with animal welfare legislation and regulations, according to the federal Animal Welfare Act (AWA).
The Institutional Animal Care and Use Committee (IACUC) must include a minimum of five members, according to the AWA, who possess certain qualifications to review animal protocols from the institution or research project. Below is the required composition of a 5-member IACUC: One Doctor of Veterinary Medicine (DVM) who is a member of the institution. One scientist, who should not be affiliated with the institution, but who is qualified in the field of research and who is not a family member of the institutional employees. One person should be designated as a non-scientist and who is not affiliated with the institution in any way. Two members of the institution's community, one of whom should be an individual who is not affiliated with the institution, a layperson representative.
According to the Animal Welfare Act (AWA), the Institutional Animal Care and Use Committee (IACUC) is a group of experts that is required to include at least five members with various qualifications in order to review animal protocols from the institution or research project. It is the IACUC's responsibility to examine animal treatment facilities and their compliance with animal welfare regulations and legislation.
In general, the five members that make up the IACUC committee are a Doctor of Veterinary Medicine (DVM) who is a member of the institution, one scientist, one non-scientist, and two members of the institution's community. To qualify to be a member of the IACUC, each member must have a certain level of expertise in their field, be qualified to evaluate the science that is being conducted, and have the necessary resources to review protocols in a thorough and accurate manner. In addition, IACUC members must not have a conflict of interest and must recuse themselves from the review process if they do.
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select all the common sources that emit vocs. question 14 options: paint gasoline glues/adhesives ddt iron/steel/tin products heavy metals
The common sources that emit VOCs are paint, gasoline, glues/adhesives, iron/steel/tin products, heavy metals.
Organic substances that have a high vapour pressure at room temperature are known as volatile organic compounds (VOCs). Low boiling point and high vapour pressure are related to volatility, which is the proportion of the sample's molecules in the surrounding air.
Along with being pollutants, VOCs are also responsible for smells and perfumes' odour. In order to attract pollinators, protect plants from predators, and even converse among themselves, VOCs are crucial in animal-plant communication. Some VOCs are harmful to the environment or pose a risk to human health. Laws are in place to control anthropogenic VOCs, especially indoors where concentrations are highest. Although the majority of VOCs are not immediately toxic, they may have long-term, chronic health effects. VOCs have been employed in several pharmaceutical products.
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100 POINTS IF ANSWERED CORRECTLY
Think of the composition of each layer of Earth and their relative sizes. Also consider Earth's atmosphere, its oceans, its ice caps, and other materials on its surface. Think about how large or small these parts of Earth are compared to one another. Then complete the following sentence.
Overall, the Earth is made up primarily of: 1. water 2. air 3. soil 4. rock
They are extremely small infront of earth size.
We live in a very small dot like place on earth.The earth size is too big.As we are in dot like we can see objects far biggerBut according to earth It's extremely big than usHydrogen is special because it can act like two groups, _____
and _____
Answer: gas and alkaline earth metal
Explanation:
0.12 g of magnesium reacted to produce 0.20 g of magnesium oxide.
Calculate the number of moles of oxygen gas (O₂) that reacted.
Relative atomic mass (A): O = 16
Mass of magnesium (Mg) = 0.12 g
Atomic mass of Mg = 24.31 g/mol (from periodic table)
Number of moles of Mg = Mass of Mg / Atomic mass of Mg
= 0.12 g / 24.31 g/mol
= 0.00494 mol
Number of moles of O₂ = Number of moles of MgO produced / 2
= 0.00650 mol / 2
= 0.00325 mol
When 12 g of Mg fully interacts with oxygen, how much MgO is formed?When the experiment is performed without the crucible cover, the magnesium oxide created reacts with any oxygen in the air. When more oxygen reacts with the magnesium, the amount of magnesium oxide generated will be larger than when the experiment was run without a cover on the crucible.
Also, any water vapour or other gases in the air may react with the magnesium oxide, influencing the final product's mass. As a result of the existence of extra reactants in the air, the mass of magnesium oxide formed will change when the crucible is not covered.
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Flammable liquids are those that have a flashpoint of:.
Answer:
Flammable liquid is any liquid having a flashpoint at or below 199.4 °F (93 °C).
Explanation:
:)
Flashpoints for flammable liquids are at 100°F. Lower flash points allow for easier ignition of liquids. A liquid's flash point is the lowest temperature at which a concentrated enough layer of vapor accumulates on top of its surface to allow for ignition.
A liquid that is flammable has a flash point* below 37.8 ° C (100 ° F). A flammable liquid has a flash point that ranges from 37.8 to 93.3° C (100 to 200° F), which is above the standard working temperature. Flammable liquids emit a vapor that, at standard working temperatures, is easily ignitable.
The substance ignites more readily the lower the flash point. For instance, petrol is more flammable than ethylene glycol and has a flash point of about -40 degrees C (-40 °F).
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A sample of what was thought to be gold was removed from a mine in San Francisco during the gold rush. After analysis, it was determined that it was actually fool's gold, or pyrite. The sample contained 17.6 grams of iron and 103 grams of sulfur. What is the percentage composition of each element in pyrite?
Answer:
14.594% Iron and 85.406% Sulfur
Explanation:
103g (S) + 17.6g (Fe) = 120.6g total mass
103/120.6 × 100 = 85.406% Sulfur
17.6/120.6 × 100 = 14.594% Iron
What is the percent by mass of iron in FeCl 3 ?
Answer:
34.429%
Explanation:
6. What are formed from the chemical reaction of the substances given
below? Write the balanced chemical reaction as well.
a) when calcium carbonate and hydrochloric acid react with eachother
CaCO3(s) + 2HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g)
A student in chm 11500 lab measured the mass of a 250-ml erlenmeyer flask and recorded it as 79. 83 g. She added 10. 00 ml of deionized water from a 25-ml buret to the flask. The mass of the flask plus the water was 89. 82 g. The temperature of the water was 22 °c. What is the calculated volume of the water that the student measured?.
An Erlenmeyer flask is also termed as conical flask and titration flask. Invented in the year 1860. It is made up of glass and plastic. Inventer - Emil Erlenmeyer
Weight of empty erlenmeyel flask = 79.83 g
Weight after addition of water = 89.82 g
Weight of water = 89.82 - 79.83 = 9.99 g
Density of water at 22 deg celcius = 0.99777
Density = mass / volume
Volume = mass / density
= 9.99 g / 0.99777 g/ ml
= 10.01 ml
Calculated volume of water that the student measured is 10.01 ml.
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04. (a) Explain briefly what you understand by Corrosion penetration rate and how it is measured The rate of oxidation and how it is measured (b) Explain the following deterioration mechanism of polymetric materials; 17 marles (i) Thermal degradation 17 marks) (1) Weathering (c) In respect to corrosion, explain the consequences of; (4 marks (i) Riveting a steel plate with copper rivets (ii) Connecting buried steel pipework to zinc plates (4 marks (d) One-half of an electrochemical cell consists of a pure nickel electrode in a solution of Nid'ions, other half is a cadmium electrode immersed in a Cda solution. If the cell is a standard one, (6 marks (1) Write the spontaneous overall reaction (6 mark (ii) Calculate the voltage that is generated
(a) Corrosion Penetration Rate (CPR) is a measurement of the thickness of a material's corrosion layer in terms of linear millimeters per year. Corrosion Penetration Rate is an important parameter that is widely used in the corrosion field to estimate the corrosion rate of a metal.
The penetration rate is determined by exposing a metal sample to the corrosive environment and measuring the quantity of metal that has been lost due to corrosion over a certain period of time. The formula used to calculate CPR is: CPR = Weight loss of the sample (mg) x 31556926.0 / A x D x t Where, A= Surface area of the sample (m²), D= Density of the sample (g/cm³), t= Exposure time in seconds
(b)Deterioration mechanism of polymetric materials:
(i) Thermal degradation: It is the process in which chemical decomposition occurs when a polymer is exposed to elevated temperatures, which can result in the loss of essential properties of the polymer.
(ii) Weathering: The process by which a polymer's structure and properties are altered as a result of exposure to the natural elements is referred to as weathering.
(c) Consequences of corrosion:
(i) Riveting a steel plate with copper rivets: When riveting a steel plate with copper rivets, galvanic corrosion is caused as a result of the contact between copper and steel. The steel will corrode more quickly than it would if it were in contact with a material that is less reactive than copper.
(ii) Connecting buried steel pipework to zinc plates: Connecting buried steel pipework to zinc plates can cause galvanic corrosion. Because zinc is more reactive than steel, the zinc plate corrodes and prevents the steel pipe from corroding. As a result, the zinc plate will corrode away, leaving the steel pipe vulnerable to corrosion.
(d) One-half of an electrochemical cell consists of a pure nickel electrode in a solution of Nid'ions, other half is a cadmium electrode immersed in a Cda solution. If the cell is a standard one:
(i) Spontaneous overall reaction: Ni(s) + Cd²⁺ (aq) → Cd(s) + Ni²⁺ (aq)
(ii) The voltage generated by the cell is: E°cell = E°cathode - E°anode
E°cell = E°Cd - E°Ni
E°cell = (-0.40) - (-0.25)
E°cell = -0.15V
Therefore, the voltage generated by the cell is -0.15V.
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Show Michael Faraday, James Maxwell experiment diagram
Faraday's first law of electromagnetic induction states that: Whenever conductor is placed in varying magnetic field, electromotive force is induced.
What is Faraday's and Maxwell experiment of electromagnetism?From the experimental observations, Faraday concluded that emf is induced when magnetic flux across coil changes with time. Therefore, Faraday's first law of electromagnetic induction states the following: Whenever conductor is placed in varying magnetic field, then an electromotive force is induced.
Maxwell's equations of electromagnetism is :
They demonstrate that electric and magnetic fields are two manifestations of same phenomenon. In vacuum with no charge or current, Maxwell's equations are : ∇ · E = 0. ∇ · B = 0. ∇ x E = -(∂B/∂t)
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if two objects repel from one another, what must be happening on the subatomic scale?
Answer:
The electromagnetic force is at work. They must have the same charge. for example, two electrons repel each other.
If two objects repel each other they must contain like charges.
According to the first law of electrostatics, like charges repel and unlike charges attract. An atom is neutral if it is made up of equal number of positive and negative charges.
If an atom has more positive than negative charges then it is positively charged. If the atom has more negative than positive charges, then it is negatively charged.
if two objects repel from one another, they must contain like charges.
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how many drops are in 655 mL of a can of soda?
Answer:
13100 drops
Explanation:
there are 20 drops in 1 ml so 20 x 655 = 13100
What was done to the linear parent function, f(x) = x, to get the function
g(x) = 1/6 x
Answer:
Vertically Shrunk by a factor of 1/6
Explanation:
Parent Formula: f(x) = a(bx - c) + d
a - vertical shrink/stretch and x-reflections
b - horizontal shrink/stretch and y-reflections
c - horizontal movement left/right
d - vertical movement up/down
Since we are only modifying a, we are dealing with vertical shrink/stretch:
Since a < 1 (1/6 < 1), we are dealing with a vertical shrink of 1/6.
Since a > 0 (1/6 > 0), we do not have a reflection over the x-axis.
Answer:Vertically compressed by a factor of 6
Explanation:
how many atoms are in 4(NH3)2NO2?
There are a total of 38 atoms in the compound 4(NH3)2NO2.
How to find the number of atomsTo determine the number of atoms in the given compound, we first need to break down the formula and identify the number of atoms in each element.
The formula is 4(NH3)2NO2, which can be written as:
4 x 2(NH3) + 1 x 2(NO2)
Each molecule of NH3 contains
one atom of nitrogen and three atoms of hydrogenEach molecule of NO2 contains
one atom of nitrogen and two atoms of oxygen.Therefore, the total number of atoms in the given compound is:
4 x 2 x (1 nitrogen atom + 3 hydrogen atoms) + 1 x 2 x (1 nitrogen atom + 2 oxygen atoms)
= 4 x 2 x 4 + 1 x 2 x 3
= 32 + 6
= 38
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which group processing statement produced the proc means output shown below?
The "proc means" output shown below is produced by the "proc means" procedure in SAS. This procedure is used to create a means file, which is a summary of the data in a SAS dataset.
The means file contains information about the central tendency, dispersion, and other statistical measures for each variable in the dataset. The "proc means" procedure takes one or more arguments that specify the variables to include in the means file. The output of the procedure includes information about the mean, median, and standard deviation of each variable, as well as other measures such as the minimum and maximum values, the quartiles, and the percentiles.
To use the "proc means" procedure to produce the output shown below, you would use a command similar to the following:
proc means data=mydataset;
class variable1 variable2 variable3;
output out=meansfile;
run;
In this example, "mydataset" is the name of the SAS dataset that you want to include in the means file, and "variable1", "variable2", and "variable3" are the names of the variables that you want to include in the means file. The "class" statement specifies the variables that should be included in the means file, and the "output" statement specifies the name of the file where the means file will be saved.
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3.) All matter has both physical and chemical properties. A physical property is one that does not change the chemical nature of matter. Which of these choices is a physical property?
A.) height
B.) flammability
C.) ability to rust
D.) reaction with water
Answer:
D
Explanation:
It would be D because you are observing the reaction and don’t change anything
The concentration of CO_2 in the Earth's atmosphere prior to significant human influences was
390ppm 280ppm 480ppm 160ppm
The Earth's atmospheric CO2 concentration was around 280ppm before human activities, but since the Industrial Revolution, burning fossil fuels has increased it to above 400ppm, well outside the range.
The concentration of CO2 in the Earth's atmosphere prior to significant human influences was 280ppm.
Before human activities, such as burning fossil fuels, deforestation, and industrial processes, the concentration of carbon dioxide in the atmosphere was relatively stable for thousands of years. This pre-industrial concentration of CO2 was around 280 parts per million (ppm).
To put it into perspective, 280ppm means that for every million molecules of air, around 280 of them were CO2 molecules. This level was maintained through a balance between natural sources of CO2, like volcanic activity and respiration, and natural sinks, such as photosynthesis and ocean absorption.
Since the Industrial Revolution, the burning of fossil fuels has significantly increased the concentration of CO2 in the atmosphere. Currently, the concentration is above 400ppm, which is considered to be well outside the range seen in the past 800,000 years.
In summary, the concentration of CO2 in the Earth's atmosphere prior to significant human influences was approximately 280ppm.
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Factors affecting movement of colored pigments in a paper chromatography
solubility of the solvent,
molecular size of the solute
The state of matter which has no definite shape or volume is calledAsolidBliquidCgasDwater
Answer: C. Gas
Explanation:
A gas is a state of matter that has no definite shape or volume, and its particles are usually far apart and moving quickly in random directions.