Answer:
the apparatus are listed below
Explanation:
The apparatus used to carry out paper chromatography are:
• Chromatography paper
• Solvent (or water)
• Pencil
• Ink (pen)
• Beaker
The apparatus used to carry out the paper chromatography are chromatography paper ,organic solvents and glass capillary.
What is paper chromatography?Paper chromatography is an analytical method used to separate colored chemicals or substances.
Paper chromatography is a quick and easy process to conduct. Most of the time, it is used to test the purity of compounds and to identify substances.
It is primarily used as a teaching tool, having been replaced by other chromatography methods, such as thin-layer chromatography.
Listed are the apparatus used to carry out the paper chromatography-
Chromatography paper Organic solvents, acids, bases, buffers, etc. to make mobile phase. A glass container with a cap. Something hold the chromatography paper: a stick, or a hook. A piece of glass capillary to load the sample onto the paper.Learn more about paper chromatography ,here:
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Sabiendo el número atómico del titanio y además que su número másico es 48, ¿cuál es la cantidad de protones, neutrones y electrones respectivamente? *
Answer:
# protones: 22
# neutrones: 26
# electrones: 22
Explanation:
El número atómico del titanio es 22. Este número atómico representa la cantidad de protones del átomo en cuestión. Así:
# protones: 22.
El número másico se define como la suma de protones y neutrones, así:
48 = 22 + # neutrones
26 = # neutrones
Un átomo es neutro, esto quiere decir que sus cargas positivas y negativas son iguales (Protones: cargas positivas; Electrones: Cargas negativas).
Así, el # protones = # electrones = 22
What byproduct of nuclear energy has caused concerns about the use of this resource and why?
Answer:
Byproduct of Nuclear Energy: Nuclear Waste
Explanation:
Nuclear waste has caused plenty of concern over the health of humans and the environment. Since nuclear wastes can last for hundreds of years, it is difficult to find areas where we can store it. Nuclear waste is toxic to humans and the environment, and I believe even some are even radioactive. The byproduct is buried deep underground surrounded by cement and concrete but can still leak through.
Why was Niels Bohr atomic model superior to all the earlier models
Answer:
because it showed how the electron could orbit the nucleus without falling into it.
Study the reaction. X(s) + 2B(aq)→ X+(aq) + B2(g) Under which circumstances will the reaction rate be highest? A) the solid X is ground to a fine powder B) the solid X is in the form of a few smooth spheres C) the solid X is densely packed at the bottom of the container D) the solid X is in the form of a single, large cube.
Answer:
Option (A) the solid X is ground to a fine powder.
Explanation:
X(s) + 2B(aq) → X+(aq) + B2(g)
In the reaction above, the rate of the reaction will be highest, when X being a solid is ground to fine powder.
Grounding X to fine powder simply means increasing the surface area of X.
An increase in surface area of reactants will definitely increase the rate of reaction because the particles of the solid will collide with the right orientation and hence speed up the reaction rate.
Why crystallization technique is preferred over evaporation?
Answer:
Pure crystals of the substance of interest are recovered using crystalization
It can be used to obtain substances that decompose on heating.
Explanation:
Crystalization is the process of converting a liquid solution to a crystalline solid. It is a common method of extracting the solid product of a reaction from solution. It can also be a separation method especially for obtaining pure crystals from a solution.
Crystalization does not require heating. Common methods of inducing crystalization include; addition of crystals of the same substance as seeds or scratching the vessel containing the solution.
The advantage of crystalization over evaporation is that it can be used to recover substance that decompose on heating. Also crystalization yields pure crystals of the substance of interest compared to evaporation in which soluble impurities may not be completely removed.
When a chemical system is at equilibrium, the concentrations of the reactants are equal to:___________.
1. the concentrations of the products.
2. the concentrations of the reactants and products have reached constant values.
3. the forward and reverse reactions have stopped. the reaction quotient, , has reached a maximum.
4. the reaction quotient, , has reached a minimum.
Answer:
catalyst
Explanation:
What is a pH in biology?
Answer:
pH is a scale used to specify the acidity or basicity of an aqueous solution. Lower values correspond to solutions which are more acidic in nature, while higher values correspond to solutions which are more basic or alkaline.
Explanation:
Answer: “pH, quantitative measure of the acidity or basicity of aqueous or other liquid solutions. The term, widely used in chemistry, biology, and agronomy, translates the values of the concentration of the hydrogen ion—which ordinarily ranges between about 1 and 10−14 gram-equivalents per litre—into numbers between 0 and 14.” - my science teacher I don’t know where she gets her notes from
Explanation:
Avogadro’s number is a constant that helps scientists count atoms and molecules. It is approximately equal to 602,200,000,000,000,000,000,000. How is this number expressed in scientific notation? A. B. C. 6.02/1023 D. 6.02 × 1023 E. 6.02 × 10-23
Answer:
E.6.02
[tex] \times [/tex]
10-23
Answer:
E.6.02 x 10^-23
Explanation:
2. When dividing the measurements 400 g/32.2 cm3, the answer has__
significant figures.
Answer:
When dividing the measurements 400 g/32.2 cm³, the answer has 3
significant figures.
Explanation:
400 g/32.2 cm³ = 12.422 g/cm³.
Our answer cannot have more significant figures than the number with the least significant figures. Since both the numerator and denominator have 3 significant figures, our answer will also have 3 significant figures.
So 400 g/32.2 cm³ = 12.4 g/cm³ to 3 significant figures
So, when dividing the measurements 400 g/32.2 cm³, the answer has 3
significant figures.
state the use of multimeters
Answer:
a use of mesurements
Explanation:
please help pls help 20 points Which of the following is a myth about water conservation? An important part of water conservation is preventing water pollution. Using an electric clothes dryer conserves more water than air-drying clothes. Buying bottled water does not conserve more water than drinking from the tap. A front-loading washing machine uses less water than a top-loading washing machine.
Answer:
Air-drying clothes conserves more water than using an electric clothes dryer.
The greater the amount of _____ released, the stronger the acid. H+ OH- Ka pH
Answer:H+(protons)..
Entropy can be thought of as the degree of disorganization of a system.
TRUE
FALSE
Answer:
True
Explanation:
The entropy of a system denoted by S is a thermodynamic function that increases in value when there are more ways to arrange the particles in the system. Some spontaneous chemical processes are entropy driven. An increase in entropy is said to drive the dissolution of ionic salts along with the evaporation of water are related to the spreading out of energy.
The entropy of a system can be taken as a measure of disorder of a system. In a spontaneous chemical process, the entropy of the universe is said to increase. ΔSunivu>0. Making the answer true.
Which form of energy does a battery-powered flashlight receive as an input?
Answer:
chemical energy
Explanation:
A battery stores energy in the form of chemical energy. Chemical energy is stored in the bond of atoms and molecules. These bonds break and convert to other forms of energy. In the given case, the chemical energy is converted to electric energy which powers the flashlight. Thus, flashlight receives energy input in the form of chemical energy.
In the formation of SO2 and SO3 the ratio of the weight of oxygen which combines with 10kg of sulphur is ?
Explanation:
So,0.3125 * 10 ^3 moles of Sulphur combines with 0.3125 * 10^3 moles of Oxygen to from SO2. Therfore mass ratio of SO2 : SO3 = 10 : 15 = 2:3.
(xiii)
Which element is an inert gas?
Answer:
All the noble gases are least reactive so noble gases are called inert gases.....A thermal reactor is fueled with 2.2% enriched UO, fuel with a density of 10.5 g/cm? What is the volumetric heat generation rate if the flux is 104 n/cm/sec? Hint: you need to calculate the number density of U-235
Answer:
number of density of U-235 = 6.7 × 10²⁰g/cm³
volumetric heat generated rate = 2.17 × 10³J/cm³.sec
Explanation:
given
fuel enrichment = 2.2%
What is the valence shell electronic configuration of Alkali Metals , Alkaline Earth Metals, Halogens and Noble Gases?
Answer:
alkali metals: 1
alkaline earth metals: 2
Halogens: 7
noble gases : 8
Answer:
Alkali Metals: 1 valence electron
Alkaline Earth metals: 2 valence electrons
Halogens: 7 Valence electron
Noble Gases: 8 Valence electrons
Which of the following questions can be answered by science? What is the composition of air? Should the driving age be reduced? What is the purpose of our existence on Earth? Should students be allowed to bring toys to school?
Your answer is A. What is the composition of air?
The question that can be answered by science is What is the composition of air? The correct option is A.
What is science?Science is a subject that deals with the components of the earth. It has a wide variety of components of earth. Like planets and meteorites. Plants, animals, and other creatures. Nature, trees, and other abiotic factors.
Science gives answers to the secrets of the earth, and they unravel the mysteries of nature and the earth. They solve the mysteries of air, water, and other natural processes.
So the composition of air can be told by science. The air is made up of a mixture of gases. Air is present in the atmosphere. It is needed for breathing, and it is an important component of life because it provides oxygen to the body.
The correct option is A. What is the composition of air?
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What are the 5 best and easy science fair projects that will help and make me win the science fair? From the 5 science fair projects pick 1 really good and easy project that will help and make me win the science fair. PLZ, I REALLY NEED HELP!!! NOTHING WITH VOLCANOES!!! Itś for 7th grade.
Answer:
Salt Bridge Over Electrified Waters: How Electricity Changes pH
Explanation:
give an example of process you notice or use each day that obeys the law of conservation of mass. and explain how this process works
Answer:
Cellular respiration:
[tex]C_6H_{12}O_6+6O_2\rightarrow 6CO_2+6H_2O[/tex]
Explanation:
Hello,
In this case, the law of conservation of mass states that matter cannot be created nor destroyed but modified, therefore, typical examples are the raft chemical reactions in nature or carried out in a laboratory. Thus, a typical one that could be daily found is in the cellular respiration wherein glucose and oxygen are converted into carbon dioxide, water and energy for us to use it in our daily activities. It is chemically represented by:
[tex]C_6H_{12}O_6+6O_2\rightarrow 6CO_2+6H_2O[/tex]
Law of conservation of mass is verified as six carbon atoms are before and after the chemical reaction, twelve hydrogen atoms are before and after it and eighteen oxygen atoms as well.
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Jamal is a student in the health care professions class. He had a very exciting day at clinical and decided to post about
it on his social media account. He posted the following “Great day saving lives today! I did CPR and saved the patient!"|
Jamal did not post his location or the patient's personal health information; however, a friend of his (Dario) saw the
post and realized that his neighbor was in a similar situation that day, Dario called his neighbor's wife and inquired as
to his health. During the conversation, Dario told the wife that his friend was there and performed the CPR. The wife
reported Jamal to his program director,
Which law did Jamal violate?
Оа. НІРАА
b. FERPA
c. Affordable Care Act
d. None
Answer:
The correct option is;
a. HIPAA
Explanation:
The federal law which safeguards Personal Health Information (PHI) is the health Insurance Portability and Accountability (HIPAA) Act of 1996 with rules regarding the security, privacy and transmission (electronically) of medical health data, was passed to improve the ease healthcare movement between healthcare providers has also added new limitations on PHI disclosure
The HIPAA restricts with whom, when, how and where PHI can be disclosed including physically (direct in person or writing) or electronically (online, over the phone)
Therefore, Jamal had violated HIPAA.
Which interaction contributes to the greenhouse effect? Gases in the atmosphere absorb heat. Dust particles scatter and reflect light from the Sun. Green visible light is trapped in Earth’s atmosphere. Light travels through a thick part of the atmosphere at sunrise and sunset.
Answer:Gases in the atmosphere absorb heat.
Explanation: :) edge2020
Gases in the atmosphere absorb heat is the interaction that contributes to the greenhouse effect.
• The solar energy captivated at the surface of the Earth is radiated back to the atmosphere in the form of heat. The greenhouse gases absorb the majority of this heat.
• The greenhouse gases are the complex molecules in comparison to other gases present in the atmosphere, they comprise the composition, which captivates heat.
• These gases radiate the heat back to the surface of the Earth, to another molecule of greenhouse gas and thus contributing to greenhouse effect.
• There are many kinds of greenhouse gases, of them the major ones are the carbon dioxide, methane, and nitrous oxide.
Thus, the statement, that is, gases in the atmosphere absorb heat is correct.
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Humans are not the only animals that pollute the air.
Please select the best answer from the choices provided
F T
Answer:
TRUE
Explanation:
Humans and many animals are responsible for air pollution. Even natural processess such as excreting feces results in release of methane, CO2 etc which contribute to air pollution
Humans are not the only animals that pollute the air. This statement is True.
What is air pollution ?Substance that alters the natural properties of the atmosphere, whether it be chemical, physical, or biological, is considered an air pollutant. Air pollution can occur inside or outdoors. Common causes of air pollution include motor vehicles, industrial operations, household combustion appliances, and forest fires.
Although there are certain natural processes that can produce air pollution, such as sulfur and chlorine gases from volcanic activity, smoke and ash from wildfires, dust storms, and biological degradation, manmade causes account for the majority of pollution in the atmosphere.
Particles that are both solid and liquid, as well as certain gases that are suspended in the air, are what produce air pollution. These gases and particles can be produced by industries, volcanoes, wildfires, dust, pollen, and vehicle and truck emissions.
Thus, Humans are not the only animals that pollute the air. This statement is True.
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help answer this no copying from Google
describe the particle theory of light
describe the wave theory of light
Answer:
The particle theory of light was given by Isaac Netwon state that light was made of particles that allow light to undergo reflection and refraction.
The wave theory of light was contemporary of the particle theory of light given by Christiaan Huygens. It states that light was a wave that allows light to undergo reflection and refraction when passes through different mediums.
(Please!!!) Which of the following is not an example of kinetic energy? (2 points) sound chemical energy radiant energy heat
Answer:
heat
Explanation:
A cesium sulfate solution reacts with barium bromide solution to produce a precipitate of barium sulfate and a solution of cesium bromide. Write the molecular equation for this reaction. part 1 - (Use the lowest possible coefficients. Use the pull-down boxes to specify states such as (aq) or (s). If a box is not needed, leave it blank.) part 2-Write the corresponding net ionic equation. (Use the lowest possible coefficients. Use the pull-down boxes to specify states such as (aq) or (s). If a box is not needed, leave it blank.)
Answer:
molecular eq.
Cs2SO4 (aq) + BaBr2(aq) → BaSO4(s) + 2CsBr(aq)
ionic eq.
SO₄²-(aq) + Ba^+2 (aq) → BaSO4 (s)
explanation
separate the ions
Cs₂^+1(aq) + SO₄^+2(aq) + Ba^+2(aq) + Br₂^-1(aq) → BaSO₄(s) + 2Cs(aq) + Br(aq)
than simplify it
SO₄²-(aq) + Ba^+2 (aq) → BaSO4 (s)
Use the periodic table to answer the following questions. How many valence electrons does oxygen have?
Answer:Oxygen has 6 valence electrons
A=2
B=2
C=4
The charge of an oxygen Ion is -2
Explanation:
According to the electronic configuration,there are 6 valence electrons in an oxygen atom.
What is electronic configuration?
Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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why are the metals like gold and silver prefferred for making jwellery?
Answer:
Such metals like gold and silver are preferred for making jewelry because they are highly malleable, meaning they can be made into any shape or design without breaking. Also, gold and silver do not leave marks on skin, and silver tends to tarnish (lose its color), but very slowly.
Answer:
Explanation:Pleased to help u....
Which of the following is a chemical property of iron.
The melting point of iron is 1536 degrees Celsius.
The boiling point of iron is 3000 degrees Celsius.
Iron has a hardness of 4-5.
Iron rusts when exposed to water and oxygen.
Answer:
Iron rusts when exposed to water and oxygen.
Explanation:
Ths other options have nothing to do with chemical properties.
Iron rusts via a process called oxidation which is a chemical reaction.
Answer:
D
Explanation: