If the value of heat, q, is positive when the temperature of a sample of water changes, then : the temperature of water was increased.
What is the relation between heat flux and temperature?
A substance's temperature is a macroscopic indicator of how quickly the atoms or molecules inside are vibrating about their mean locations. The increase in kinetic energy of these particles is reflected as an increase in temperature when heat is applied to a body.
The heat q and the temperature change Δ T : connection is the mathematical relationship at the core of this inquiry.
q = m c Δ T ,
where c is the substance's specific heat capacity and m is the substance's mass. The last two amounts can never be negative, it should be noted.
A positive value of heat hence always suggests a positive change in temperature. In other words, if heat is positive, the substance has received heat energy, increasing its ultimate temperature over its initial temperature.
Question:
If the value of heat, q, is positive when the temperature of a sample of water changes, then:
a. the temperature of water was decreased.
b. the temperature of water was increased.
c. it depends on whether mass and specific heat values are positive or negative.
d. None of the above.
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What is the number of grams in one mole of(a) hydrogen gas (a diatomic element),(b) helium,(c) carbon monoxide, and(d) water.
Given:
Mole = 1
Formula:
Moles = Given mass / Molar mass
a) Molar mass of hydrogen = 2.016
Mass = 1 * 2.016
Mass = 2.02g
b)Molar mass of Helium = 4
Mass = 1 * 4
Mass = 4g
c)Molar mass of carbon monooxide = 28
Mass = 1 * 28
Mass = 28g
d)Molar mass of water = 18
Mass = 1 * 18
Mass = 18g
The substance's intense property, the molar mass, is independent of the sample's size. The coherent unit of molar mass in the SI is kilograms per mole (kg/mol). Molar masses are, however, virtually generally given in g/mol due to historical considerations.
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iron undergoes an allotropic transformation at 912°c: upon heating from a bcc (???? phase) to an fcc (???? phase). accompanying this transformation is a change in the atomic radius of fe—from rbcc
When iron undergoes an allotropic transformation at 912°c: upon heating from a bcc to an fcc , accompanying this transformation is a change in the atomic radius of fe—from 0.4330a to 0.353a, where a is the edge length of the cubic unit cell.
What is latent heat?The heat energy required for the change of phase of any substance is known as latent heat of that substance for a particular change of phase or process.
Iron changes from a bcc to an fcc at 912 °C, and this allotropic transformation is accompanied by a shift in the atomic radius of fe from 0.4330 a to 0.353 a, where an is the edge length of the cubic unit cell.
Thus, there would be a shift in the atomic radius of iron from 0.4330 a to 0.353 a.
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What state
of matter has a defined volume but undefined shape?
colligative properties are properties of a solution that depend only on the of solute particles in a given volume of solution, not on their .
Colligative properties are properties of a solution that depend only on the number of solute particles in a given volume of solution, not on their type.
What are Colligative properties?
Colligative properties of solutions are characteristics that depend on the quantity of molecules or ions in the solute, but not on the kind of solute. Osmotic pressure, boiling point elevation, freezing point depression, and vapor pressure reduction are examples of Colligative properties.
A property of a solution is said to be collative if it depends simply on the proportion of solute to solvent particles in the solution and not on the nature of the solute.
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What are some examples of chemistry?
plisss
creo que es fermentacion
Answer:
Es Fermentación
Whta is a major difference between the rutherford and the wave mechnaical models of the atom?
A major difference between the Rutherford atomic model and the Wave mechanical model of atom is that Rutherford model was based on the gold foil experiment which considered only the particle properties of atoms whereas the wave mechanical model considers the particle properties and the wave properties of atoms.
Rutherford atomic model was given by Ernest Rutherford to explain what an atom is. His gold foil experiment showed that atom is mostly empty space with, small, dense, positively-charged nucleus.
Wave mechanical model was given by Thomas Young. He called the experiment as Double-slit experiment, to test the nature of the light. Young discovered that electrons of the atom exhibited the particle-wave dual properties which led to this theory named as wave mechanical theory of an atom.
These theories explain different properties of atoms with the help of different experiments.
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claudia performed a flame test in her lab. the result of her flame test is shown here. what scientific questions could claudia ask about the flame? check all that apply. what element causes this flame color? is this the prettiest flame color? will the flame color change if another element is added? will changing the temperature affect the flame color? which flame test does the class like the best?
Claudia performed a flame test in her lab, different element causes different flame color, prettiest flame color means it is blue color flame, each element has different amount of extra energy, different part of flame have different temperature, blue color flame test class like the best.
Flame test means the method in which identify of unknown metal and metalloids ion on their characteristics and color which are come on heat on the Bunsen burner called flame test.
Here Claudia performed a flame test in her lab and in that flame test the scientific question could she ask that is and answer of this questions are as follow : different element causes different flame colour because each individual element had its own identity that's why different element causes different flame colour. prettiest flame color means it is blue colour flame this blue colour is so pretty to see in bunsen burner, each element has different amount of extra energy because when heated electron get excited and move to a diffrent orbit and as they cool down they move back to thier normal position and this extra energy produce light waves, different part of flame have different temperature, because different temperature take different colour on the flame like colder part show diffusion and flame will be red in this way, blue or orange colour test are like the class most because it seen so pretty on the bunsen burner.
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what mass of ammonium thiocyanate must be used if it is to react completely with 6.7 g barium hydroxide octahydrate?
Mass of ammonium thiocyanate must be used if it is to react completely with 6.7 g barium hydroxide octahydrate is 3.14g.
What is ammonium thiocyanate?Ammonium thiocyanate is an inorganic compound with formula NH4SCN. It is salt of the ammonium cation and the thiocyanate anion.
Ammonium thiocyanate is used in manufacture of herbicides, thiourea, and transparent artificial resins; in matches; as a stabilizing agent in photography; in various rustproofing compositions; as adjuvant in textile dyeing and printing; as a tracer in oil fields; in separation of hafnium from zirconium (important for the production of hafnium-free zircalloy for use in nuclear fuel cladding), and in titrimetric analyses.
Ammonium thiocyanate can also be used to determine iron content in soft drinks by colorimetry.
Ammonium thiocyanate may also be used to separate the quinidine, from liquors, after the isolation of quinine from the neutral, aqueous, sulphate solution. The salt is added to hot solution and the gummy solid that forms is strained off from the liquid. The solid is then refluxed with methanol, which dissolves most of mpurities, leaving the quinidine thiocyanate as a crystalline solid of 90 - 95% purity. Following the separation, (usually by centrifuge) the solid may then be further purified to pharmaceutical quality. (Quinidine is used for treatment of heart arrhythmia and therefore has considerable value.)
Ammonium thiocyanate = NH4SCN
Barium hydroxide octahydrate = Ba(OH)2 · 8H2O
Solution:
The Balanced chemical equation:
2NH4SCN + Ba(OH)2 · 8H2O → Ba(SCN)2 + 2NH3 + 10H2O
According to equation above: n[NH4SCN]/2 = n[Ba(OH)2 · 8H2O]
Molar mass of Ba(OH)2 · 8H2O is 315.46 g/mol.
Hence,
n[Ba(OH)2 · 8H2O] = (6.5 g) × (1 mol / 315.46 g) = 0.020605 mol
n[NH4SCN] = 2 × n[Ba(OH)2 · 8H2O] = 2 × 0.020605 mol = 0.04121 mol
Molar mass of NH4SCN is 76.122 g/mol.
Hence, mass of NH4SCN will be:
m(NH4SCN) = (0.04121 mol NH4SCN) × (76.122 g NH4SCN / 1 mol NH4SCN) = 3.137 g NH4SCN
Mass of the NH4SCN = 3.137 g = 3.14 g
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In the preparation of primary amines, how can direct nucleophilic substitution between nh3 and alkyl halide be made more practical than reacting nh3 and the alkyl halide in a 1:1 ratio?
Direct nucleophilic substitution between NH₃ and alkyl halide be made more practical than reacting NH₃ and the alkyl halide in a 1:1 ratio By Using a large excess of NH₃.
Why is direct nucleophilic substitution of an haloalkane with NH₃ not a very useful method for preparing primary amines?
Polyalkylation of the amine will end in multiple products
What happens when haloalkane reacts with NH₃?Ch₂₂: RX + NH₃. Ammonia reacts as a nucleophile with alkyl halides to offer primary amines in a nucleophilic substitution reaction. Yields are often poor because the product, a primary amine, RNH₂, is itself a nucleophile and may react with more alkyl halide.
Is NH₃ a robust nucleophile?
NH₃(Ammonia) has the stronger nucleophilic character than water molecule. Because the Oxygen within the water molecule doesn't likely to bond with any carbon atom compared to Nitrogen atom. Since Oxygen has more electronegativity than Nitrogen. Hence it holds onto its lone pair tightly than Nitrogen.
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why is it important to know what substances you have available to work with, and how they might change when you developing special effects
Editing and VFX software has advanced to the point where the only limitations are your technical skills and your imagination
Although they are distinct, special effects and visual effects are frequently confused. There are further categories, however special effects are frequently manufactured artificially on set and are known as practical effects (for example, a controlled explosion in an action scene). On the other side, visual effects are produced in the editing room or post-production. While modern visual effects deal with animation, computer generated imagery (CGI), and other post-production effects, early visual effects saw filmmakers experimenting with film stock.
Each has advantages and disadvantages. According to filmmaker Steven Bernstein, special effects are frequently preferable because they allow actors to react to the effects in real time. They also provide lighting effects and other characteristics that would otherwise need expensive computer creation.
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A student is trying to classify an unidentified, solid gray material as a metal or a nonmetal. Which question will best help the student classify the material?
In order to help the learner categorize the material, the following inquiry is best:" Is the material malleable or ductile?".
What is a malleable material?
Any substance that can be easily hammered into a thin sheet is bendable. The metal that is most malleable is gold. In contrast, ductility refers to a solid material's capacity to deform when subjected to tensile stress.
A ductile substance is what?
The capacity of a material to be hammered thin or stretched into wire without breaking is known as its ductility. You can draw a ductile material into a wire. The majority of metals, including gold, silver, copper, erbium, terbium, and samarium, are excellent examples of ductile materials.
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Questions:
A student is trying to classify an unidentified, solid gray material as a metal or a nonmetal. Which question will best help the student classify the material? A. Is the material malleable or ductile? B. Does the material feel hard to the touch? C. Will the material float in water? D. Does the material feel rough or smooth?
mass = 10g
volume = 25mL
Find the density, Remember: density = mass/volume
Answer: p = 4.0E-7 g/cm^3
arene and functionalized arene based two dimensional organic-inorganic hybrid perovskites for photovoltaic applications
Our study reveals that both the perovskites are direct band gap semiconductors and possess desirable band gap for solar energy absorption.
What is perovskites?Calcium titanium oxide mineral perovskite is made up of calcium titanate and has the pronunciation /prvskat/. (chemical formula CaTiO3). The perovskite crystal structure, which is the same as that of CaTiO3 (XIIA2+VIB4+X23), is the name given to the group of substances that share this structure. A wide range of tailored materials can be created by embedding numerous different cations in this framework.
It was named after Russian mineralogist Lev Perovski after being found in the Ural Mountains of Russia by Gustav Rose in 1839. (1792–1856).
Victor Goldschmidt's study on tolerance factors from 1926 is where the noteworthy crystal structure of perovskite was first discovered. X-ray diffraction data on barium titanate by Helen Megaw led to the publication of the crystal structure in 1945.
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classify each reactant and product in this reaction as an acid or base according to the brønsted theory. hf h2o↽−−⇀f− h3o
Bronsted-lowry theory does not define acid and bases particularly but they particularly tell how they react or act in the given chemical reaction.
Bronsted-Lowry theory are also known as proton theory of acids and bases.
From the given reaction, HF contribute a proton, in the form of an H+ atom, to water H2O, producing the fluoride F− and hydronium H3O+ ions. The reactant side of Bronsted-Lowry acid is :
Bronsted−Lowry acid: HF
On the other hand the Bronsted-Lowry base is
Bronsted−Lowry base : H2O
Meanwhile, the particle on the product side that same after the Bronsted-Lowry acid contribute a proton to the Bronsted-Lowry base is called a conjugate base (are able to take a proton) while the persist particles taking a proton is the conjugate acid (are able to contribute a proton). Hence,
Bronsted−Lowry acid : H3O + Bronsted−Lowry base : F−
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Look at the image. The velocity between point A and point B is
m/s. Only use one decimal point. (3.0, 1.2, 0.9, etc.)
The velocity between point A and point B is 1.0 m/s
How to determine the velocity between point A and point B
What is velocity?
Velocity is simply defined as the rate of change of displacement with time. Mathematically, it can be expressed as:
Velocity = Change of displacement / time
From the question given above, the following data were obtained:
Displacement at A = 0 mDisplacement at B = 8 mChange of displacement = 8 - 0 = 8 mTime at A = 0 sTime at B = 8 sChange in time = 8 - 0 = 8 s Velocity =?The velocity between point A and point B can be obtained as follow:
Velocity = Change of displacement / time
Velocity = 8 / 8
Velocity = 1.0 m/s
Thus, the velocity between point A and point B is 1.0 m/s
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To get the most reliable temperature measurment, a thermometer should be placed ?
A thermometer should always be submerged in a substance just deep enough to completely cover the bulb in order to measure temperatures accurately.
What is thermometer?An instrument known as a thermometer is used to measure temperature or a temperature gradient. A thermometer consists of two key components: a temperature sensor that changes in response to changes in temperature and a way to translate these changes into a numerical value.
An instrument that measures temperature is a thermometer. It is able to gauge the temperature of solids like food, liquids like water, and gases like air.
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given that the density of mercury is 13.6 g/mL, and a sample is 4.2 cm^3, what is the mass of the sample?
I don't understand how to figure this out, so a step by step explanation would be great. Thanks!
Answer:
5.712g
Explanation:
density =mass÷volume
13.6g/mL=mass÷4.2cm^3
mass=13.6×4.2
mass=5.712g
The variables for this experiment include mass, volume and the materials in the various balls, as well as their
densities. In Part II, you will be comparing an inflated football with a deflated one. Use the drop-down menus to
complete the sentences and identify the independent and dependent variables.
The mass of air inside the balloon is an independent variable, whereas the balloon's volume is a dependent variable.
When compared to the deflated balloon, the expanded balloon has a bigger capacity.
The following are some of the variables connected to the inflated and deflated balloons:
volume of the balloon and the amount of air inside it
The amount (mass) of air inside the balloon determines the balloon's volume.
What are dependent and independent variable ?There are often two different sorts of variables in analytical health research. We anticipate that independent variables will have an impact on dependent variables. What occurs as a result of the independent variable is referred to as a dependent variable.
As a result, we can say that the balloon's volume is a dependent variable and its air mass is an independent variable.
The balloon's volume grows as the volume of air inside it does.
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What is a theory?
Group of answer choices
another word for hypothesis
an educated guess
a possible explanation of a general principle offered to explain observed facts
a possible explanation for a hypothesis
An explanation for a natural occurrence is provided by a hypothesis, which is supported by observation and testing.
A hypothesis is a well-informed prediction based on specific data that serves as the basis for more research.
Many of them dismiss evolution as "simply a hypothesis," in contrast to gravity, which must exist because it is a law. In the scientific community, the terms "theory," "facts," "laws," and "hypothesis" have extremely particular meanings that don't quite correspond to the ones we use in ordinary language. A testable hypothesis is a speculative explanation for an observable. It serves as a springboard for additional explanation. Contrarily, a theory is an explanation of a particular feature of the natural world that is supported by facts, validated hypotheses, and rules.
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while pipetting diiodoacetic acid, a few droplets landed onto my arm. i washed it off for 15 minutes and did not see any sign of a chemical burn on my skin. i should proceed to do the following: 1 point
If you washed it off for 15 minutes and did not see any sign of a chemical burn on your skin , you can: visit a doctor if you see any sign on your skin.
Steps to follow in case of acid dropped on skin:
Immediately run lukewarm water over the area for 30 minutes.Remove any jewelry and clothing from the afflicted region.Watch for symptoms to develop. After 20 to 30 minutes, if the burning feeling on your skin is still there, keep rinsing under a stream of clean water and call your doctor or the Poison Control Hotline.What is Diiodoacetic acid?
A disinfection by-product (DBP) created during the disinfection of water is Diiodoacetic acid. Asparagopsis taxiformis contains the natural substance diiodoacetic acid, according to accessible information.
Iodoacetic acid: What is it?
A byproduct of acetic acid is iodoacetic acid. Because it is an alkylating agent, like many alkyl halides, this substance is poisonous.
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Hazardous gas released from a factory’s smokestack is an example of __________ externality. a. local b. positive c. resource d. negative
Answer: D. negative
Explanation:
identify the properly written and balanced equation for the precipitation reaction between potassium phosphate and magnesium sulfate.
The reaction is double displacement reaction of potassium phosphate and magnesium sulfate between balanced equation for the precipitation reaction is
2 K3PO4 + 3 MgSO4 → Mg3(PO4)2 + 3 K2SO4
Here reaction is between potassium phosphate and magnesium sulfate we have to understand the balance chemical equation. precipitation reactions are double displacement reactions in which the conversion of a solution into solid by converting the substance into insoluble form or by making the solution a super saturated one. here the reaction is two mole of aqueous tribasic potassium phosphate react with three mole of aqua magnesium sulphate to form one mole of solid farringtonite and three mole of aqueous potassium sulphate this is balanced chemical reaction of potassium phosphate and magnesium sulfate.
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Which isotope has a longer half-life? select the correct answer and explanation.
Xenon-124 isotope has a longer half life.
The duration needed for a quantity to decrease to half of its initial value is known as the half-life.One of those isotopes whose half life are longer is xenon 124, whose half-life has been calculated by experts to be 18 sextillion years due to its disintegration into tellurium 124.Half-life does not imply that atoms degrade at a constant rate. The figure simply represents the time it will take, on average, for the majority of a radioactive element to diminish itself by half.While the majority of xenon isotopes have half-lives of less than 12 days, Xenon-124 is believed to have extraordinarily long half-lives and to be fundamentally stable.These decays, which are the rarest processes ever directly recorded, have been detected in the XENON1T detector in 2019.Thus Xenon-124 has highest half life.
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Phosphorus-32 has a half-life of 14.0 daysdays. starting with 2.00 gg of 32p32p, how many grams will remain after 112 daysdays pearson?
By the half-life of radioactive, the remaining mass of radioactive elements is 7.8125 x 10¯³ gram.
We need to know about the half-life of the radioactive elements to solve this problem. The radioactive element will decay over time and follow the equation
N = No(1/2)^(t/t'')
where N is the final quantity, No is the initial quantity, λ is the decaying constant, t is time and t'' is the half-life of a radioactive element.
From the question above, we know that
t'' = 14 days
No = 2 grams
t = 112 days
Calculate the remaining mass
N = No(1/2)^(t/t'')
N = 2(1/2)^(112 / 14)
N = 7.8125 x 10¯³ gram
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a cell containing only pure water is placed into a solution containing 1m sucrose. the cell's membrane is impermeable to water, sucrose, sodium ions and chloride ions. how could you make the cell isosmotic to the outside solution?
Cell containing pure water with membrane impermeable to water, sucrose, sodium ions and chloride ions can't be made isosmotic to a solution of 1m sucrose.
Osmolarity represents the total amount or concentration of solute in a solution. Solution with low osmolarity means the solution has less solute particles, while solution with high osmolarity has more solute particles. Solution with low osmolarity is referred as hypoosmotic and solution with high osmolarity is referred as hyperosmotic.
When a cell is kept in a solution, the ability of the extra cellular solution to move the water across the cell membrane is called tonicity. Water move from low concentration of solute to high concentration of solute. Water move out of cell if it is kept in hypertonic solution, while water move inside the cell if it is kept in hypotonic solution. The water keeps moving across the membrane until the concentration outside and inside the cell become equal. If cell is placed in an an isotonic solution, the net flow of water is zero.
Impermeable membranes hinders the movement of substance through them. Membrane impermeable to water will not allow the movement of water through it.
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which of the following sentences is the correct way to answer the following question te gusta ir a la escuela
The correct way to answer
Spanish Ques; te gusta ir a la escuela?
Ans; si, me gusta ir a la escuela.
English Ques; You like go to school?
Ans; I enjoy going to school.
Where spanish language is spoken?
Along with Spain in Europe and Equatorial Guinea in Africa, Spanish is the official language of 18 nations in the Americas (Venezuela, El Salvador, Ecuador, Bolivia, Chile, Colombia, Costa Rica, Cuba, Dominican Republic, Mexico, Nicaragua, Panama, Paraguay, and Uruguay.)
Twenty different countries have made Spanish their official language.
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15.91 kilometers to meters
Answer: 15910 meters
Explanation:
1 kilometer = 1000 meters
15.91 kilometers * 1000 meters/1 kilometer =
15.91 * 1000/1=
15.91*1000=15910 meters
A grignard synthesis begins with 6.00 g of bromobenzene and ends with 3.94 g benzoic acid. what is the percent yield of the benzoic acid? assume all other reagents are in excess.
6.00 g of bromobenzene and 3.94 g of benzoic acid are used in a grignard synthesis. 84.4% of the yield of benzoic acid is produced.
Given:
Grignard synthesis begins with
Bromobenzene = 6 g
to Benzoic acid = 3.94 g
122 g of benzoic acid would be generated from 157 g of bromobenzene.
As a result, 6 g of bromobenzene will result in
Then,
= 122 / 157 × 6
= 4.66g
3.94 is prepared then,
The percentage will be
(3.94/4.66) x 100 = 84.4 percent
An organomagnesium halide with the formula RMgX is a Grignard reagent, and in it, X is a halogen (-Cl, -Br, or -I), and R is an alkyl or aryl group (based on a benzene ring) group. A Grignard reagent is used to start a Grignard reaction, which produces a secondary or tertiary alcohol from a ketone or aldehyde.
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List 4 kinds of hazards that are caused by Volcanoes.
Four kinds of hazards that are caused by the volcanoes are lava flow, floods or tsunami, landslides, and volcanic earthquakes.
Volcanoes emits the hot, dangerous gases, ash, lava, and rocks which can be powerfully destructive. People have been dying from the volcanic blasts. Volcanic eruptions results in the additional menances to the health, such as floods, power outages, water contamination, and wildfires.
Ash exposure can be harmful to infants, elderly people, and people with respiratory conditions such as asthma, emphysema, and other chronic lung diseases.
Hazards such as -
Earthquakes such as preparing for, surviving, and recovering from an earthquake. Floods such as making sure food and water are safe, cleaning up, and emergency supplies. Landslides and Mudslides such as protective measures to take before, during, and after a landslide or debris flow. Power outages such as carbon monoxide poisoning, alternative heat and energy sources, downed power lines, and food and water safety. Wildfires such as smoke inhalation and other wildfire hazards.
Sources
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What mass of co2 is produced when 25.00 ml sample of ethanol (density = 0.789 g/ml) combusts?
The mass of CO2 gas is 19.725 grams when a 25.00 ml sample of ethanol with a density of 0.789 g/ml combusts.
What is Density?Density may be defined as a type of physical property that significantly deals with the description of how much space an object or substance takes up with respect to the amount of matter in that object or substance.
In a more simple sense, it is characterized as the measurement of quantity or mass per unit of volume in a particular substance.
According to the question,
The mass of the CO2 = ?
The density of the CO2 gas = 0.789 g/ml.
The volume of CO2 gas = 25.00 ml.
The formula for calculating the density is as follows:
Density = Mass/Volume.Mass = Density × Volume.= 0.789 g/ml × 25.00 ml. = 19.725 grams.
Therefore, the mass of CO2 gas is 19.725 grams when a 25.00 ml sample of ethanol with a density of 0.789 g/ml combusts.
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