A mixture is formed of two substances (molecules, elements, compounds, etc.) that are not chemically bonded. A compound is formed of two substances chemically joined together, so the answer is A.
Answer:
a. the substances in a compound are chemically joined in a fixed proportion.
Explanation:
A compound is defined as a pure substance that has more than one element. Compounds have a fixed composition. This means that a compound always has the same elements with equal percentages by mass. Meanwhile, a mixture is made up of two or more components that are mixed, but are not chemically combined.
Georgina wants to visually represent a polymer. Witch would make that best model? Building blocks a silver chain ice pop sticks a quilt
To visually represent a polymer, Georgina should use building blocks like atomic model kits, jelly tots, playdough, and toothpicks to build models of monomers such as ethene, propene, or vinyl chloride. These materials can effectively demonstrate the connection between monomers to form a polymer chain, serving as an educational tool for understanding molecular models and polymer chemistry.
Georgina wants to visually represent a polymer. The best model for representing a polymer would be building blocks, such as atomic model kits, jelly tots, playdough, and toothpicks. These materials provide the flexibility needed to showcase how individual monomers can be connected to form more complex structures, mimicking the actual chemical bonding of polymers. For example, if one were to build models of ethene, propene, or vinyl chloride monomers, they could use colored balls or jelly tots to represent the atoms and use toothpicks or sticks to represent the bonds between them, creating clear visual representations of each monomer.
By connecting these basic structures together, one can simulate the formation of a polymer chain. This hands-on approach helps illustrate the concept of monomers linking to form polymers and enhances the understanding of the molecular models and the chemical properties of the individual building blocks or functional groups within the polymer structure.
The diagram shows four different locations in an atom. A shaded circle is shown, labeled nucleus. Two small points labeled one and three are shown inside this shaded circle. A lighter shaded concentric circle is shown with a radius more than double of the inner circle. A point labeled two is shown inside a section of this circle which does not overlap with the inner circle. A flower petal like shaded region is shown above and below these circles. A point labeled four is shown inside the lower petal. Which locations are likely to have subatomic particles that are constantly in motion?
The shaded area labeled as 2 is likely to have subatomic particle that are constantly in motion.
The subatomic particles of the atom that are constantly in motion are called as electrons. The probability of finding electrons in the region shaded and labeled as 2. Electrons are in continuous motion in orbits around the nucleus of the atom. Therefore, the answer is 2.
answer: 2 and 4
looking at the diagram, we know that 1 and 3 are both in the nucleus which contain both protons (positive charge) and neutrons (neutral charge). the outer area, or "cloud" (2), contains electrons that are in constant motion. number 4 is located in the electron cloud with the name "orbitals" which showcase "waves" created by the movement of an electron in an atom. knowing how electrons are always moving due to their charge, locations 2 and 4 would possess subatomic particles that are constantly in motion.
i also took the test !!
The mass number of an atom is equal to which of the following?
Question 15 options:
the number of protons in a nucleus
the number of protons plus the number of electrons in an atom
the number of electrons circling the nucleus of an atom
the number of protons plus the number of neutrons in a nucleus
The statement of mass number of an atom is "the number of protons plus the number of neutrons in a nucleus."
What is mass number?The total number of protons and neutrons in an atomic nucleus is known as the mass number, often known as the atomic mass number or nucleon number. Each atom also has a mass number, which is represented by the symbol A. The atom's mass number equals the sum of the number of protons and neutrons in the nucleus.
Protons + neutrons = mass number
Hence the correct answer is the number of protons plus the number of neutrons in a nucleus.
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Why do scientists study seismographs?
The scientists study seismographs to know about the force and the time duration of the earthquake.
What are seismographs?
The instrument known as seismogram that makes a record of seismic waves create because of the earthquake and explosion, or other Earth-shaking phenomenon.
Seismographs are made up with electromagnetic sensors that then translate ground motions into change in electrical field , which are then processed and recorded by the instruments for further analysis.
Therefore, scientists study seismographs to know about the force and the time duration of the earthquake.
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1. Eutrophication can cause excess algae growth. Which of the following describes how nutrients contribute to eutrophication?
A. Released naturally from rocks during weathering
B. Come from fertilizer and sewage runoff
C. Released by dead and decaying organisms
D. Come from water waste from nuclear power plants
Eutrophication causes excess algae growth because of fertilizer and sewage runoff because of the amounts of nitrogen and phosphorus it contains
Answer:
B
Explanation:
Eutrophication is a major problem for the ecosystems surrounding farmlands. This is as a result of farmers irresponsibly using fertilisers, and end up adding too much to their soil.
The way they see it, is that the more fertiliser they give the plants, the better the plants will grow, unfortunately plants can only take up so much nutrients, and what ends up happening is when the rain comes, a lot of the nutrients in the soil get washed away, and they usually end up in steams or lakes.
Now fertilisers are not specific to certain plants, so algae, which grows in lakes and streams, now have access to an almost endless supply of nutrients. So, what happens is the algae take up nutrients, and grow so much, that it ends up absorbing all the oxygen dissolved in the water. This causes the fish to die, due to the lack of oxygen and the body of water becomes uninhabitable.
2H2O + 2Na ? 2NaOH + H2 Which of these is a reactant in this chemical reaction?
Water (H2O) and Sodium (Na) are reactants.
Explanation:2H2O+2Na......2NaOH+H2
In the above reaction the water (H2O) and sodium (Na) are reactants and sodium hydroxide (NaOH) and hydrogen are products.
And this is the single displacement reaction.
Final answer:
In the equation 2H2O + 2Na → 2NaOH + H2, water (H2O) and sodium (Na) are the reactants, while sodium hydroxide (NaOH) and hydrogen gas (H2) are the products.
Explanation:
In the chemical reaction 2H2O + 2Na → 2NaOH + H2, the reactants are the substances that start the reaction. In this case, the reactants are water (H2O) and sodium (Na). When sodium metal is placed in water, a reaction occurs where these reactants transform into the products, which are sodium hydroxide (NaOH) and hydrogen gas (H2).
Specifically, solid sodium reacts with liquid water, producing molecular hydrogen gas and ionic compound sodium hydroxide, which is a solid in pure form but readily dissolves in water to form an aqueous solution.
I’m so confused on this one!
Which list of elements contains a metal, a metalloid, and a nonmetal?
1) Ag, Si, I2
2) Ge, As, Ne
3) K, Cu, Br2
4) S, Cl2, Ar
The correct answer is 1) Ag, Si, I₂
Ag or silver is a metal. Silver is a transition element which lies in the d-block of the periodic table.
Si or silicon is a metalloid. Silicon is a metalloid which lies in the p-block of the periodic table.
I₂ or iodine is a nonmetal. Iodine is a halogen which lies in group 17 of the periodic table. All halogens are nonmetals.
Option 1: Ag, Si, I2 is the correct answer, where Ag is a metal, Si is a metalloid, and I2 is a nonmetal. These elements exhibit distinctive properties of metals, metalloids, and nonmetals.
Explanation:The correct answer is option 1: Ag, Si, I2. In this group, Ag (Silver) is a metal, Si (Silicon) is a metalloid, and I2 (Iodine) is a nonmetal. Metals are elements that have properties such as good electrical and thermal conductivity, malleability, ductility, and a shiny appearance. Metalloids, on the other hand, have properties of both metals and nonmetals. Nonmetals are typically poor conductors of heat and electricity, and they aren't malleable or ductile; they are brittle.
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Which element is represented by the electron configuration in example B? Example B: 1s22s22p63s23p64s23d104p2
Answer is: germanium is represented by the electron configuration in example B.
Electron configuration of an element: 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p².
According to electron configuration, this element has 32 electrons.
Element with 32 electrons and 32 protons (atomic number 32) is germanium.
Germanium (symbol: Ge) is a lustrous, hard, grayish-white metalloid in the carbon group.
The element that can be represented with the given electron configuration [.1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p².] is Germanium
The electronic configuration of an element can be regarded as a symbolic notation which represent the ways electron of that particular atoms are distributed at atomic orbitals. In this configuration, energy level as well as the type of orbital are first written then the number of electrons.The given configuration belongs to the elements belongs to germanium which has 32 electron and this 32 electron is used for the atomic configuration and an atomic number of 32.Therefore, germanium has the electron configuration of [..1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p².
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Which two changes in state are most represented in water cycle
Answer: Evaporation and condensation are the two changes in state which are most represented in water cycle.
Explanation:
A process of circulation of water by passing through different states between the atmosphere, oceans and land is known as water cycle.
In water cycle, the most represented changes in state are evaporation and condensation. As during evaporation, the water present in the oceans, rivers, wells or on the land evaporates because of the heat from the sun as a result the liquid state is changing into gas.
Whereas, during condensation gas or water vapours changes into liquid. For example, when water condenses in the atmosphere it results in the formation of clouds.
Thus, it can be concluded that evaporation and condensation are the two changes in state which are most represented in water cycle.
Evaporation and condensation are the two primary changes of state represented in the water cycle, where water continually transitions between liquid and gas as it is heated by the sun and cools in the atmosphere.
The two changes in state that are most represented in the water cycle are evaporation and condensation. During evaporation, liquid water is transformed into water vapor, a gas, as it gains heat from the sun or the air. This water vapor then rises into the atmosphere. When the water vapor cools, it undergoes condensation, turning back into liquid water and forming clouds. These two processes play a vital role in the recycling of water on Earth and are essential aspects of the global climate system.
Evaporation and condensation, respectively, represent the equilibrium between the liquid and gas states of water. They are continually occurring throughout the Earth's surface and atmosphere, driving the water cycle and influencing weather and climate.
what state of matter is air?
Air is in the state of matter known as a gas. While it can sometimes contain particles from other states (liquid or solid), these are suspended within the air, and the air itself remains a gas. Air is not normally in the state of plasma on Earth.
Explanation:Air is considered to be in the state of matter known as a gas. This is one of the three most common states of matter, the others being solid and liquid. Gases have the property of conforming both to the shape and volume of their container. They can be compressed or expanded, unlike solids or liquids, which have a fixed volume.
Occasionally, air might contain particles from other states of matter, such as small droplets of water (a liquid) or dust (a solid). However, these are not part of the air itself, but suspended within it, so the air still remains a gas.
There is also another state of matter called plasma, which is like a gas but with some of the atoms ionized. This state of matter, typically found in high-temperature environments like stars and lightning strikes, is distinct from gases. However, under normal conditions on Earth, air is not a plasma but a gas.
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Someone give a 100ml of a certain liquid that weighs 20g, could that be water?
100 mL of water weighs 100 g.
If 100 mL of a liquid that weighs only 20g, it cannot be water because of the great difference in density, unless there is an enormous error in the weighing process.
Pleeease answer! 10 POINTS
An endothermic reaction will start when the required (delta)H energy is received from the environment or solution.
True or False
It is false because an endothermic reaction will also start when energy is received from the environment when there is no solution involved
Mixing vinegar and with baking soda produces carbon dioxide and water. Is this a chemical change or a physical change?
Which of the following elements has the first ionization energy?
A. Stronium (Sr)
B. Oxygen (O)
C. Phosphorous (P)
D. Scandium (Sc)
Among these elements the strontium (Sr) has lowest first ionization energy.
Explanation:The first ionization energy is the energy required to remove one mole of the most loosely held electrons from one mole of gaseous atoms to produce 1 mole of gaseous ions each with a charge of 1+.
The first of two main methods which scientists use to calculate the ionization energy is the Subtraction Method.
Answer:
Sr
Explanation:
A gas mixture contains 0.150 mol of oxygen (O2) gas, 0.419 mol of nitrogen (N2) gas. And 0.211 mol of argon (Ar) gas in a 0.250 L flask at 298 K. What is the total pressure of the mixture?
Hey There!:
Total number of moles of gases:
0.150 + 0.419 + 0.211 => 0.780 moles
Volume = 0.250 L
Temperature = 298 K
Using the ideal gas law:
p*V = n*R*T , putting all the values we get :
p * 0.250 = 0.780 * 0.0821* 298
p* 0.250 = 19.083
p = 19.083 / 0.250
p = 76.3 atm
Hope That helps!
To find the total pressure of a gas mixture, calculate the individual pressures of each gas using the Ideal Gas Law and add them to get the total pressure according to Dalton's Law of partial pressures. The pressure of each component is calculated using its respective moles, the gas constant, temperature and volume, and adding up these pressures gives the total pressure of the mixture.
Explanation:To calculate the total pressure of a gas mixture, we use the Ideal Gas Law PV=nRT, where P stands for pressure, V for volume, n for the number of moles, R is the universal gas constant and T is the temperature. In this context, it comes in hand with Dalton's Law of partial pressures, which states that in a mixture of non-reacting gases, the total pressure exerted is equal to the sum of the partial pressures of the individual gases.
Firstly, calculate the individual pressures of each gas in the mixture using the Ideal Gas Law, where for each gas, the number of moles, volume and temperature are known. Once the individual pressures are calculated, you add them together to get the total pressure of the gas mixture.
Therefore you would find that:
Pressure of Oxygen (O2): (0.150 mol * 0.0821 L.atm/K.mol * 298 K) / 0.250 LPressure of Nitrogen (N2): (0.419 mol * 0.0821 L.atm/K.mol * 298 K) / 0.250 LPressure of Argon (Ar): (0.211 mol * 0.0821 L.atm/K.mol * 298 K) / 0.250 LSum these up to determine the total pressure of the mixture.
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What is the empirical formula of a compound that is 14 g calcium, 11g oxygen, and 0.7 g hydrogen
HELP!!1 mL is equal to 1 cm^3. What is the mass (in kg) of 2.0m^3 of Br2? Hint: you will have to make a new conversion factor between cm^3 and m^3. This can be done by cubing both sides of the 100 cm= 1m conversion factor. You must remember to cube the number as well as the units. PLEASE HELP!!!
(Im not sure if this helps but.... 3.1 g Br2= 1ml br2)
Answer:- 6200 kg
Solution:- Volume of bromine is given as [tex]2.0m^3[/tex] and it's density is [tex]\frac{3.1g}{mL}[/tex]. It asks to calculate the mass of bromine in kg.
We need to do the unit conversions for volume from [tex]m^3[/tex] to [tex]cm^3[/tex] and then mL. After this the volume is multiplied by density to get the mass in grams that could further be converted to kg. The set is shown as:
[tex]2.0m^3(\frac{(100cm)^3}{1m^3})(\frac{1mL}{1cm^3})(\frac{3.1g}{1mL})(\frac{0.001kg}{1g})[/tex]
= 6200 kg
So, the mass of bromine in the given volume of it is 6200 kg.
Final answer:
To find the mass in kg of 2.0 m3 of Br2, we convert the volume to cm3, use the given density to find the mass in grams, and then convert the mass to kilograms, resulting in 6,200 kg.
Explanation:
The question asked is: What is the mass (in kg) of 2.0m3 of Br2? Given that 1 mL is equal to 1 cm3 and 3.1 g Br2 = 1 mL Br2, the first step is to convert the given volume in meters cubed (m3) to cubic centimeters (cm3). Knowing that 1 m = 100 cm, we cube both sides to get 1 m3 = 1,000,000 cm3 or 106 cm3.
Therefore, 2.0 m3 = 2.0 × 106 cm3. Next, we use the density of Br2 to find the mass: 3.1 g/cm3. So, the mass of 2.0 m3 of Br2 in grams is 2.0 × 106 cm3 × 3.1 g/cm3 = 6,200,000 g. To convert this to kilograms, we divide by 1,000, resulting in 6,200 kg.
an example of a chemical change is
a) dissolving sugar in water
b) sanding wood
c) gasoline burning
d) melting ice
and explain plz so i can rlly learn it !!!
What is a the volume of a salt crystal measuring 3.22 x 10^-2 cm by 1.5 x 10^-4 cm by 4.30 x 10^-3 cm?
A. 2.1 x 10^-8 cm3
B. 21 x 10^-9 cm3
C. 2.1 x 10^-24 cm3
D. 21 x 10^-6 cm3
What is the process of intentionally interfering with the breeding process to encourage certain traits over others.
The process of intentionally interfering with the breeding process to encourage certain traits over others is called artificial selection or selective breeding.
Explanation:In selective breeding, the breeding of plants and animals are done intentionally to produce desirable traits. Organisms with the desired traits, such as size or taste, are artificially mated or cross-pollinated with organisms with similar desired traits. The deliberate exploitation of selective breeding to produce desired results has become very common in agriculture and experimental biology. In this way, the scientists control and introduce the desirable traits in plants and animals.
Answer:
I thin the artificial selection is the answer it also fits the spaces
Explanation:
ok so I went in did the crossword answers are
1. biotechnology
2. DNA
3. transgenic animals
4. Genetic Engineering
5. plant
6. transgenic crop
7. Artificial Selection
8. food
9. clones
10. reproduction
the density of water at different temperature is listed in the table above. Based on this information we can predict that the density of water at 50 might be and the density at 150 might be?
look it nup on google should help
Final answer:
The density of water decreases slightly below 1000 kg/m³ as temperatures increase from 4°C to 50°C. At 150°C, water would be a gas with much lower density. This behavior is due to the unique molecular structure and hydrogen bonding in water.
Explanation:
The question regarding the density of water at different temperatures touches on fundamental principles of chemistry and physics. The unique properties of water mean that its density does not simply decrease linearly with temperature. Instead, due to hydrogen bonding and molecular structure, water is at its densest at around 4°C. As the temperature increases from 4°C, the density of liquid water decreases due to increased molecular movement that causes water molecules to occupy more space. Therefore, at 50°C, we can predict the density of water would be slightly lower than its maximum density at 4°C, likely a little under 1000 kg/m³. At 150°C, water would be in a gaseous state under normal atmospheric pressure, and thus its density as a gas would be significantly lower than as a liquid.
Which is the balanced chemical equation representing the reaction between barium sulfide and platinum fluoride? BaS + PtF2 BaF2 + PtS A. BaS + PtF2 BaF2 + PtS B. BaS + 2PtF2 BaF2 + 2PtS C. 2BaS + PtF2 2BaF2 + PtS D. 2BaS + PtF2 2BaF2 + 2PtS
BAS might be an improperly capitalized: BAs, BaS
PTF2 might be an improperly capitalized: PtF2
BAF2 might be an improperly capitalized: BaF2
PTS might be an improperly capitalized: PtS
Answer:
BaS + PtF2 → BaF2 + PtS
Explanation:
This is an Double Replacement Reaction, so the products gonna be Barium fluoride and Platinum sulfide.
BaS + PtF → BaF + PtS
C3H8 is saturated or unsaturated
C3H8 is saturated compound.
Explanation:A saturated compounds are organic compounds having single covalent bond between carbon atoms.
Answer: saturated
Explanation:
Saturated hydrocarbons are defined as the hydrocarbons in which a single bond is present between carbon and carbon atoms. The general formula for these hydrocarbons is [tex]C_nH_{2n+2}[/tex].
Unsaturated hydrocarbons are defined as the hydrocarbons which have double or triple covalent C-C bonds. They are known as alkenes and alkynes respectively. The general formula for these hydrocarbons is [tex]C_nH_{2n}[/tex] and [tex]C_nH_{2n-2}[/tex].
The given compound is [tex]C_3H_8[/tex] belongs to formula [tex]C_nH_{2n+2}[/tex] where n=3 and thus a saturated hydrocarbon.
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The question does not contain any relevant information or topic.
This question contains a series of unrelated and nonsensical words and phrases, which do not provide any coherent information. It is difficult to determine the specific subject or grade level of this question. The content appears to be random text and does not relate to any specific topic or subject.
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Why don't we get an eclipse every month? *
ANSWER:
We don't get an eclipse all period because the Moon's revolution is turned at approximately 5∘ to the ecliptic.
EXPLANATION:
If the Moon's revolution was in the equal level as the Earth's we would encounter two eclipses all period. A solar eclipse would appear every new moon also a lunar eclipse would appear every full moon. As the Moon's orbit is turned at 5∘ to the ecliptic, an eclipse can simply happen when the Moon is near one of its links which are the points where the Earth and Moon circles intersect. The line joining the links also has to be facing towards the Sun.
A person is standing on ice. He throws a snowball with a force of 4 N to the right, while the snowball pushes the person with a force of 4 N to the left. What is the net force on the person?
0 N
8 N
4 N, right
4 N, left
Final answer:
Correct option is: 4 N, left. The net force on the person standing on ice who throws a snowball to the right with a force of 4 N is 4 N to the left, in accordance with Newton's third law of motion.
Explanation:
The question involves understanding Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. In this scenario, a person standing on ice throws a snowball to the right with a force of 4 N. According to Newton's third law, the snowball exerts an equal force of 4 N to the left on the person. Therefore, the net force on the person is 4 N to the left, as the forces exerted by the person on the snowball and by the snowball on the person are action-reaction pairs and do not cancel each other out. Instead, they act on different objects.
How many moles of O2 are produced when 0.400 mol of KO2 reacts in this fashion?
The produced moles of O₂ is "0.300 mol".
According to the question,
Moles of KO₂:
0.400The equation is:
→ [tex]4 KO_2 + 2 CO_2 \rightarrow 2 K_2CO_3+ 3 O_2[/tex]
Now,
→ The moles of O₂ will be:
= [tex]\frac{3}{4}\times moles \ of \ KO_2[/tex]
By substituting the values, we get
= [tex]\frac{3}{4}\times 0.400[/tex]
= [tex]0.300 \ mol[/tex]
Thus the above answer is right.
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Chemistry!! Please help asap!! Will mark brainiliest!!
1. The half-reaction 2MnO2 + H2O + 2e- Mn2O3 is missing
a. electrons
b. OH- ions
c. Mn2+ ions
d. O2- ions
2. The reaction Mg(s) + 2Ag+ (aq) → Mg2+ (aq) + 2Ag(s) will occur because Mg(s) is
a. a stronger oxidizing agent than Ag(s)
b. a stronger reducing agent than Ag(s)
c. reduced
d. disproportionated
3. After the equation below has been balanced, what will the coefficients of the reactants and products be, in order?
Equation: Fe²⁺ (aq) + MnO₄⁻ (aq) + H⁺ (aq) --> Fe³⁺ (aq) + Mn²⁺ (aq) + H₂O (l)
a. 5, 1, 7, 5, 1, 4
b. 5, 1, 8, 5, 1, 4
c. 1, 1, 2, 1, 1, 4
d. 1, 1, 4, 1, 1, 2
Option B is correct option.
The half-reaction 2MnO2 + H2O + 2e- Mn2O3 is missing OH- ions.
Explanation:
Full equation:
2MnO2 + H2O + 2e- → Mn2O3 + 2OH-
Part 2:The option B which is Mg is stronger reducing agent than Ag is correct option.
Explanation:
Equation:
Mg(s) + 2Ag+ (aq) → Mg2+ (aq) + 2Ag(s)
According to equation Mg converts to Mg+2 which means it gives to electron to reduce Ag. So it act as an reducing agent.
Part 3:The correct option is B. Which is 5, 1, 8, 5, 1, 4.
Explanation:
Full equation :
5 Fe²⁺ (aq) + MnO₄⁻ (aq) + 8 H⁺ (aq) --> 5 Fe³⁺ (aq) + Mn²⁺ (aq) + 4 H₂O (l)
The study of chemicals and bonds is called chemistry. There are different types of elements and these are metals and nonmetals.
The correct answer is mentioned below.
What is oxidizing agent?An oxidizing agent, also known as an oxidant or oxidizer, is a substance that has the ability to oxidize other substances In other words to accept their electrons. Common oxidizing agents are oxygen, hydrogen peroxide, and the halogensThe answer to the first question is as follow:-
The half-reaction[tex]2MnO_2 + H_2O + 2e^- Mn_2O_3[/tex] is missing OH- ions.The full reaction is as follows:-
[tex]2MnO_2 + H_2O + 2e^- ----> Mn_2O_3 + 2OH^-[/tex]
The answer to the second question is as follow:-
Mg is a stronger reducing agent than Ag is correct
The reaction is as follows:-
[tex]Mg(s) + 2Ag+ (aq) ---> Mg2^+ (aq) + 2Ag(s)[/tex]
According to the equation Mg converts to Mg+2 which means it gives to electron to reduce Ag. So it acts as a reducing agent.
The answer to the third question is option B Which is 5, 1, 8, 5, 1, 4.
The full equation is as follows:-
[tex]5 Fe^{2+} (aq) + MnO_4^- (aq) + 8 H^+(aq) --> 5 Fe^{3+} (aq) + Mn^{2+} (aq) + 4 H_2O (l)[/tex]
Hence, the correct answer is described.
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Of the elements pt v li and kr which is a nonmetal
Answer is: Kr (krypton).
Krypton is a chemical element with symbol Kr and atomic number 36.
Krypton has 36 electron and 36. It is noble gas (group 18).
Noble gases are in group 18: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe) and radon (Rn). They have very low chemical reactivity.
Platinum (Pt), vanadium (V) and lithium (Li) are metals.
Answer:
Krypton is non metal.
Explanation:
The difference between a metal and non metal is that metals are ready to give electrons to attain half filled or full filled electron stability.
Non metal are reluctant to give electrons.
Out of the given choices
a) Pt : platinum is a transition metal.
b) V : Vanadium is a transition metal.
c) Li: Lithium is an alkali metal
d) Kr : Krypton is a non metal. It is a noble gas with full filled stability.
Calculate the energy of a photon of electromagnetic radiation whose frequency is 2.81×1014 s?1
Answer : The energy of a photon is [tex]18.619\times 10^{-20}J[/tex].
Solution : Given,
Frequency of a photon = [tex]2.81\times 10^{14}s^-[/tex]
Planck' constant = [tex]6.626\times 10^{-34}Js[/tex]
Formula used :
[tex]E=h\nu[/tex]
where,
E = Energy of a photon
h = Planck's constant
[tex]\nu[/tex] = Frequency of a photon
Now put all the given values in above formula, we get
[tex]E=(6.626\times 10^{-34}Js)\times (2.81\times 10^{14}s^-)[/tex] [tex]=18.619\times 10^{-20}J[/tex]
Thus, the energy of a photon is [tex]18.619\times 10^{-20}J[/tex].