Through homogeneous co-precipitation and traditional solid-state calcining, a red long persistent phosphor of -Zn3(PO4)2: Mn2+, Mg2+ was created.
Effects of mg2 on improving luminous performance for a red long-lasting phosphor, -zn3 (po4) 2: mn2X-ray diffractions, scanning electron microscopes, X-ray photoelectron spectroscopies, decay curves, and thermoluminescence spectra were used to corroborate the crystalline structures and characteristics of the materials. The phase transition of Zn3(PO4)2:Mn2+ from to as well as the enhancement of the crystallinity of phosphors will be caused by the dopant of Mg2+, according to the XRD results. A noticeable peak at 620 nm in the photoluminescence emission spectrum of the red -Zn3(PO4)2: Mn2+, Mg2+ phosphor is due to the Mn2+ ion's 4T1g-6A1g transition. The addition of Mg2+ as a dopant can significantly improve the luminous characteristics of -Zn3(PO4)2: Mn2+. For the discussion of intrinsic flaws, TL curves are used. The suggested persistent luminescence operating mechanismlearn more about phosphor here
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Scenario: (This is for questions 7-12)
One January day when it was 10 degrees F outside, an Uncle went to Safeway to collect a bouquet of balloons for his nieces birthday. He ordered a mix of latex balloons in various colors. He appreciated the warmth of the store. He watched the balloons get inflated and noticed they were full and taut with Helium. He took the balloons home. When he got to his nieces' house he noticed the balloons were sunk in and wrinkled and floating ½ way down to the floor of his car. He was so disappointed. He placed them in the back room until the party. The house was 74 degrees. The party began an hour later and when he went back into the room to retrieve the deflated balloons, much to his relief, they were full and taut as before. He wondered what could have caused this reversal?
Question:
What is your hypothesis as to why the Uncle saw these changes in the balloons?
(20 POINTS) I NEED IT TODAY!
Base your answer on the information below and on your knowledge of chemistry.
Two very stable compounds, Freon-12 and Freon-14, are used as liquid refrigerants. A Freon-12 molecule consists of one carbon atom, two chlorine atoms, and two fluorine atoms. A Freon-14 molecule consists of one carbon atom and four fluorine atoms.
To which class of organic compounds do Freon-12 and Freon-14 belong?
Liquid waste is held in the bladder until the bladder sends sensory information to the brain to let the brain know that the bladder is full. The brain controls the release of this waste. This is an example of the A respiratory system working with the circulatory system. B circulatory system working with the skeletal system. C endocrine system working with the reproductive system. D nervous system working with the excretory system.
Answer:
Option D is correct
Explanation:
Nervous system is the network of nerve cells and fibres. This system helps to transfer nerve impulses among various parts of the body.
The excretory system performs the function of excretion and helps in discharging wastes.
The brain controls the release of the waste from the bladder. This is an example of the nervous system working with the excretory system.
SCIENCE Match Term Definition Chromosphere A) The central and hottest section of the sun Convective zone B) Layer of the sun where energy is transferred by convection Core C) Layer of the sun that is known for its red color and can only be seen during eclipses Radiative zon D) Layer of the sun where energy is transferred by thermal conduction
The correct match of each term with its definition is as follows:
Core: The central and hottest section of the sunConvection zone: The layer of the sun where energy is transferred by convectionChromosphere: The layer of the sun that is known for its red color and can only be seen during eclipses Radiative zone: The layer of the sun where energy is transferred by thermal conductionWhat are the parts of the sun?The sun is a star that the Earth revolves around and from which it receives light and warmth. The parts in the sun are as follows:
The core is the center and the hottest region where the nuclear fusion reactions that power the Sun occur.The convection zone is the layer of the sun which energy travels by convection from the radiative zone to the photosphereThe radiative zone is the layer of the sun which energy is transferred away from the core by radiation.Chromosphere is the reddish extension of the sun's atmospheric envelope between the corona and the photosphere.Learn more about sun at: https://brainly.com/question/17376727
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Answer:
Chromosphere = C) Layer of the sun that is known for its red color and can only be seen during eclipses.
Convective zone = B) Layer of the sun where energy is transferred by convection.
Core = A) The central and hottest section of the sun.
Radiative zon = D) Layer of the sun where energy is transferred by thermal conduction.
Explanation:
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Answer: C
Explanation:
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What does the 2 mean in the formula 5Mg3(PO4)2? There are two elements in magnesium phosphate. There are two molecules of magnesium phosphate. There are two magnesium ions in a molecule of magnesium phosphate. There are two phosphate ions in a molecule of magnesium phosphate.
Answer: In this compound, phosphorous and oxygen act together as one charged particle, which is connected to magnesium, the other charged particle.
Explanation:
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Given the unbalanced equation below, answer the following: Calculate the number of liters of 3.00 M lead (II) iodide solution produced when 1.66 mol Kl react?
Pb(NO3)2 + 2KI → 2KNO3 + PbI2
The number of liters of 3.00 M lead (II) iodide : 0.277 L
Further explanationReaction(balanced)
Pb(NO₃)₂(aq) + 2KI(aq) → 2KNO₃(aq) + PbI₂(s)
moles of KI = 1.66
From the equation, mol ratio of KI : PbI₂ = 2 : 1, so mol PbI₂ :
[tex]\tt \dfrac{1}{2}\times 1.66=0.83[/tex]
Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution
[tex]\large \boxed {\bold {M ~ = ~ \dfrac {n} {V}}}[/tex]
Where
M = Molarity
n = Number of moles of solute
V = Volume of solution
So the number of liters(V) of 3.00 M lead (II) iodide-PbI₂ (n=0.83, M=3):
[tex]\tt V=\dfrac{n}{M}\\\\V=\dfrac{0.83}{3}\\\\V=0.277~L[/tex]
Why is density a property but mass and volume is not a property?
Answer:
Extensive properties, such as mass and volume, depend on the amount of matter being measured. Intensive properties, such as density and color, do not depend on the amount of the substance present. Physical properties can be measured without changing a substance's chemical identity.
Explanation:
Beth has a one-day-old baby daughter. When Beth puts her finger in the baby’s hand, the baby grasps her finger. Which statement best describes why the baby grasps Beth’s finger?
A.) The baby’s reflex to grab is an innate behavior.
B.) The baby’s visual memory recognizes Beth’s finger.
C.) The baby is a day old and has learned to reach for Beth.
D.) The baby’s homeostatic response is to touch objects that are warm
Answer:
The baby`s reflex to grab is an innate behavior.
It`s not B because if the baby is 1 day old it`s not going to 'remember'.
It`s not C because it hasn`t really 'learned' anything.
It`s not D because babies can`t sense heat like a snake or something. -_-
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The statement which statement best describes why the baby grasps Beth’s finger is that it is a reflex to grab is an innate behavior.
What is reflex?
In biology, a reflex, or reflex action, is an involuntary, unplanned sequence or action and nearly instantaneous response to a stimulus.
The simplest reflex is initiated by a stimulus, which activates an afferent nerve. The signal is then passed to a response neuron, which generates a response.
Reflexes are found with varying levels of complexity in organisms with a nervous system. A reflex occurs via neural pathways in the nervous system called reflex arcs. A stimulus initiates a neural signal, which is carried to a synapse. The signal is then transferred across the synapse to a motor neuron, which evokes a target response. These neural signals do not always travel to the brain,so many reflexes are an automatic response to a stimulus that does not receive or need conscious thought.
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The two liquids of the mixture having the same boiling point cannot be seperation of distillation Explain.
Answer:
True
Explanation:
Two liquids of a mixture having the same boiling point cannot be separated using the process of distillation.
Distillation is one of the process of physical separation techniques.
It relies on physical property called the boiling point. In a fractionating column, a mixture is heatedAs the boiling point of the each component compound in the mixture is reached, the compound rises up within the column.So without a difference in the boiling point of the compound that makes up a mixture, the separation by distillation will not be possible.
How many grams are in 3.01 x 1024 molecules of H2SO4
Answer:
490. g H₂SO₄
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
3.01 × 10²⁴ molecules H₂SO₄
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of H - 1.01 g/mol
Molar Mass of S - 32.07 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of H₂SO₄ - 2(1.01) + 32.07 + 4(16.00) = 98.09 g/mol
Step 3: Convert
[tex]3.01 \cdot 10^{24} \ molecules \ H_2SO_4(\frac{1 \ mol \ H_2SO_4}{6.022 \cdot 10^{23} \ molecules \ H_2SO_4} )(\frac{98.09 \ g \ H_2SO_4}{1 \ mol \ H_2SO_4} )[/tex] = 490.287 g H₂SO₄
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
490.287 g H₂SO₄ ≈ 490. g H₂SO₄
What is the ground-state electron configuration of chlorine and the number of valence electrons in it?
Explanation:
Chlorine is an element in group 7 on the periodic table.
It is the second element in this group of halogens
The element has a total of 17 electrons:
Ground state configuration = 1s² 2s² 2p⁶ 3s² 3p⁵
Valence electrons are the outermost shell electrons;
From the configuration: 3s² 3p⁵ is the valence shell
Number of electrons = 2 + 5 = 7
You and your lab group have been asked to design an investigation to determine the effects of heat transfer between two different objects.
Which of the following investigation designs explains the heat transfer when atoms directly touch?
А
Boiling water, in a pan, sitting on a lit Bunsen burner.
B
Boiling water, in a pan, in front of a lit Bunsen burner.
С
Hands warming in front of a lit Bunsen burner.
D
Hands touching the handle of pan sitting on a lit Bunsen burner.
The investigation designs that explain the heat transfer when atoms directly touch have been the hand touching the handle of the pan sitting on the lit bunsen burner. Thus, option D is correct.
Heat has been the energy that can neither be created nor destroyed. The heat energy can be transferred from one body to another with the transfer of atomic energy.
The atoms of an object gaining energy start to vibrate and transfer the energy to another atom that is in close proximity to the vibrating atoms.
The boiling of water in a pan by sitting it onto the bunsen burner has been an example of the transfer of heat energy. The heat energy of the burner has been transferred to the atoms of the pan that resulting in the boiling of the water in the pan. It has been the transfer of energy in an object.
By touching the pan, the energy of the pan has been transferred to the body. Thus the transfer of energy takes place between two different objects.
Thus, the example of heat transfer between two different objects has been the transfer of energy from the bunsen burner to the pan, and from touching the pan by hands, the energy has been transferred to the hands, Thus, option D is correct.
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which chemical equation represents a redox reaction?
Answer:
B if i'm not mistaken.
Explanation:
Write the complete and net ionic equation for the following reaction:
Al2(SO4)3(aq) + Mg(OH)2(aq) → MgSO4(aq) + Al(OH)3(s)
Answer:
Al2(SO4)3 + 3Mg(OH)2 → 2Al(OH)3 + 3MgSO4
Explanation:
What is Atomic Radius
Answer:
Atomic Radius can be simply defined as the distance between the last shell of electrons and the nucleus of an atom.
Answer: The atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding shells of electrons. Illustrated Glossary of Organic Chemistry - Atomic radius. Atomic radius: The radius of an atom. This distance between an atom's nucleus and outer electron shell. ... Atomic radius differs with the bonding state of an atom (for example a nonbonded atom of an element versus the same element within a covalent bond). Atomic radius is determined as the distance between the nuclei of two identical atoms bonded together. The atomic radius of atoms generally decreases from left to right across a period. The atomic radius of atoms generally increases from top to bottom within a group.
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How many molecules are in 5.06L of oxygen gas?
_Fe +_02 → _Fe2O3
Answer:4,3,2
Answer:
4Fe+3O2------>2fe2O3
Explanation:
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Is a gummy worm increased by two inches a qualitative or quantitative
Answer:
quantitative
Explanation:
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1. Examples of pure substances are
elements and _____.
O mixtures
O compounds
Answer: Examples of pure substances include iron, aluminum, silver, and gold. Mixtures: Substances that have two or more different particles are mixtures. Examples of mixture include the salt solution which is a 'mixture' of two components, salt, and water.
Explanation:
Q.2. How does the valency of elements vary in going down a group of the periodic table?
Answer:
The valency does not change going down a group since the bonding behavior is not affected by the core electrons.
What is a molecular geometry
Answer:
Molecular geometry, also known as the molecular structure, is the three-dimensional structure or arrangement of atoms in a molecule. Understanding the molecular structure of a compound can help determine the polarity, reactivity, phase of matter, color, magnetism, as well as the biological activity.
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Which is a pure substance? air nitrogen apple juice tap water
Answer:
A Pure substance cant be broken down in any way. Nitrogen cant be broken down any further
Explanation:
Air is a mixture of gasses
Juice and be reduced to sugars
Tap water can be boiled into vapor
Answer: Air nitrogen. Elements and compounds are the two types of pure substances. Examples of common elements include carbon, nitrogen and hydrogen. They consist of one type of atom and cannot break down into something else. ... Compounds such as water, salt and sugar are also pure substances.
Explanation:
Identify each of the reactions as synthesis (S), decomposition (D), combustion (C), single replacement (SR) or double replacement (DR).
Identifying each reaction with their correct term
Reaction A Synthesis ( S )Reaction B Double replacement ( DR )Reaction C Decomposition ( D )Reaction D Single replacement ( SR )Reaction E Double replacement ( DR )Reaction F Single replacement ( SR )Reaction G Synthesis ( S )Reaction H DecompositionReaction I Synthesis ( S )Reaction J Single replacement ( SR)What is double replacement reactionA double replacement reaction is a type of chemical reaction whereby two reactants exchanges its ions ( cations or anions ) to produce two new products. It can also known as a double displacement reaction. while a single replacement reaction leads to the substitution of one element for another in chemical compound.
Hence we can conclude that the answers to your questions are as listed above.
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The number of grams in 2.56 x 1025 molecules of HCl are
Answer:
1569.5g
Explanation:
Given parameters:
Number of molecules = 2.56 x 10²⁵
Unknown:
Mass of HCl = ?
Solution:
To solve this problem, let us find the number of moles first;
Number of moles = [tex]\frac{number of particles}{2.56 x 10^{25} }[/tex]
So,
Number of moles = [tex]\frac{2.56 x 10^{25} }{6.02 x 10^{23} }[/tex] = 0.43 x 10² = 43mol
Now;
Mass of HCl = number of moles x molar mass
Molar mass of HCl = 1 + 35.5 = 36.5g/mol
Mass of HCl = 43 x 36.5 = 1569.5g
Write a ""lifeline"" of a robin over the first year of its life. Include important events.
Explanation:
Robins are born in the spring or summer and are mature birds and ready to breed in the following spring or summer. They do not mate for life. Pairs usually remain together during an entire breeding season, which can involve two or three nestings.
Since leaving the nest (fledging), it takes another 10-15 days for babies to become good fliers and individual birds. The parents continue to feed their young throughout this time.
a homogeneous mixture has the same composition throughout, while a heterogeneous mixture has different compositions in different regions.
This is the difference between a homogeneous and a heterogeneous mixture.
For example, salt (NaCl) and water make a homogeneous mixture (the same proportions of its components throughout any given sample), because both substances are polar.
A solution is homogeneous mixture composed of two or more substances.
In aqueous solution, a solvent is water and solute (in this example sodium chloride) is a substance dissolved in water.
A heterogeneous mixture is not uniform in composition (in this mixture different metals and minerals), but proportions of its components (for example mixture particles of different colors, small pebbles) vary throughout the sample.
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Explain why mass was lost in activity b when the reaction was done in the normal setup, but stayed the same when the reaction was done in the gas collection setup. cite evidence from activity b of the chemical changes gizmo to support your answer.
In accordance with the law of conservation of mass, in any reaction, mass cannot be gained or lost; it must instead be constant in a system. Therefore, in a closed system, mass is not lost, but in an open system, mass is lost as it gets released into the air.
Because the reaction was balanced and contained in the gas collecting arrangement, the mass remained constant, but in the conventional configuration it was not, and the gas had to be released. Due to the gas being released into the atmosphere rather than being retained inside the arrangement, mass was lost.
When the reaction was studied in a closed environment where the gas was collected after the reaction, the mass changes were noted down, which helped to prove the point of the law of conservation of mass and energy. In this case, when the reaction setup was performed in a normal way, the mass lost in the surroundings was not considered or being calculated.
One might consider a soda can as an example, where the carbonated beverage has pressurized carbon dioxide gas in it. When the container is opened, the gas bubbles dissipate into the environment, therefore the mass changes are not recorded. The mass altered would stay the same if the soda can was opened in a manner that allowed the gas evolution to be monitored.
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I need help fast!!! Fill in the coefficients
Answer:
2HCl - H2 + Cl2
Explanation:
The two hydrochloric acid molecules decompose into one hydrogen molecule (H2) and one chlorine molecule (Cl2). If there is only one type of a specific molecule present, you should not have to add a coefficient of 1 behind it.