Answer:
An element is the simplest form of matter that cannot be split into simpler substances or built from simpler substances by any ordinary chemical or physical method. There are 110 elements known to us, out of which 92 are naturally occurring, while the rest have been prepared artificially. Elements are further classified into metals, non-metals, and metalloids.
Table 2.11.1: Characteristic properties of metallic and non-metallic elements:
Distinguishing luster (shine)
Non-lustrous, various colors
Nonmetals
Elements that tend to gain electrons to form anions during chemical reactions are called non-metals. These are electronegative elements. They are non-lustrous, brittle and poor conductors of heat and electricity (except graphite). Non-metals can be gaseous, liquids or solids.
Physical Properties of nonmetals:
Physical State: Most of the non-metals exist in two of the three states of matter at room temperature: gases (oxygen) and solids (carbon).
Non-Malleable and Ductile: Non-metals are very brittle, and cannot be rolled into wires or pounded into sheets.
Conduction: They are poor conductors of heat and electricity.
Luster: These have no metallic luster and do not reflect light
Conductivity: Poor conductors of heat and electricity
Melting and Boiling Points: The melting points of non-metals are generally lower than metals
Seven non-metals exist under standard conditions as diatomic molecules:
H2(g)
N2(g)
O2(g)
F2(g)
Cl2(g)
Br2(l)
I2(l) (volatile liquid - evaporates readily)
Chemical Properties of Nonmetals
Non-metals have a tendency to gain or share electrons with other atoms. They are electronegative in character.
Nonmetals, when reacting with metals, tend to gain electrons (typically attaining noble gas electron configuration) and become anions:
Nonmetal + Metal -> Salt
3Br2(l)+2Al(s)→2AlBr3(s)(2.11.4)
Compounds composed entirely of nonmetals are molecular substances (not ionic).
They generally form acidic or neutral oxides with oxygen that that dissolve in water react to form acids:
Physical Properties of Metalloids
State: They are all solid at room temperature.
Conduction: Some metalloids, such as silicon and germanium, can act as electrical conductors under the right conditions, thus they are called semi-conductors.
Luster: Silicon for example appears lustrous, but is not malleable or ductile (it is brittle - a characteristic of some nonmetals). It is a much poorer conductor of heat and electricity than the metals.
Solid Solutions: They can form alloys with other metals.
Chemical Properties of Metalloids
Their physical properties tend to be metallic, but their chemical properties tend to be non-metallic.
The oxidation number of an element in this group can range from +3 to -2, depending on the group in which it is located.
Trends in Metallic and Nonmetallic Character
Metallic character is strongest for the elements in the leftmost part of the periodic table, and tends to decrease as we move to the right in any period (nonmetallic character increases with increasing ionization values). Within any group of elements (columns), the metallic character increases from top to bottom (the ionization values generally decrease as we move down a group). This general trend is not necessarily observed with the transition metals.
2.10: Electron Affinities 2.12: Electronegativity
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2.4: Development of the Periodic Table
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The calculation of orbital energies in atoms or ions with more than one electron (multielectron atoms or ions) is complicated by repulsive interaction...
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Explanation:
its D
Answer:
(A) Varying ability to conduct electric current.
Explanation:
The most useful property of metalloids is their varying ability to conduct electric current.
Metalloids are elements or substances that shares properties that transcends between those of a true metal and non-metal.
Based on their properties that straddles those of metals and non-metals, they find good use in electronic parts. Most importantly because they have varying ability to conduct electric current. They conduct current under certain conditions.GIVING BRAINLIEST! Please answer with 5-7 sentences.
Describe exothermic reactions in terms of energy.
Answer:Exothermic reactions are reactions or processes that release energy, usually in the form of heat or light. In an exothermic reaction, energy is released because the total energy of the products is less than the total energy of the reactants.
Explanation:lol
In bulk, jelly beans cost 18 cents per ounce.
What is the cost of the jelly beans in dollars per pound?
Explanation:
One pound is equal to 16 ounces. One pound of jelly beans cost $2.88p
Answer:
$2.88
Explanation:
what
your events made Gautam Buddha to
go in search of the truth?
Answer:
The Buddha (also known as Siddhartha Gotama or Siddhārtha Gautama[note 3] or Buddha Shakyamuni) was a philosopher, mendicant, meditator, spiritual teacher, and religious leader who lived in Ancient India (c. 5th to 4th century BCE).[5][6][7][note 4] He is revered as the founder of the world religion of Buddhism, and worshipped by most Buddhist schools as the Enlightened One who has transcended Karma and escaped the cycle of birth and rebirth.[8][9][10] He taught for around 45 years and built a large following, both monastic and lay.[11] His teaching is based on his insight into duḥkha (typically translated as "suffering") and the end of dukkha – the state called Nibbāna or Nirvana.
The Buddha was born into an aristocratic family in the Shakya clan but eventually renounced lay life. According to Buddhist tradition, after several years of mendicancy, meditation, and asceticism, he awakened to understand the mechanism which keeps people trapped in the cycle of rebirth. The Buddha then traveled throughout the Ganges plain teaching and building a religious community. The Buddha taught a middle way between sensual indulgence and the severe asceticism found in the Indian śramaṇa movement.[12] He taught a spiritual path that included ethical training and meditative practices such as jhana and mindfulness. The Buddha also critiqued the practices of Brahmin priests, such as animal sacrifice.
A couple of centuries after his death he came to be known by the title Buddha, which means "Awakened One" or "Enlightened One".[13] Gautama's teachings were compiled by the Buddhist community in the Suttas, which contain his discourses, and the Vinaya, his codes for monastic practice. These were passed down in Middle-Indo Aryan dialects through an oral tradition.[14][15] Later generations composed additional texts, such as systematic treatises known as Abhidharma, biographies of the Buddha, collections of stories about the Buddha's past lives known as Jataka tales, and additional discourses, i.e, the Mahayana sutras.
Explanation:
To decrease the power used:
O A. make sure the circuit wires run horizontally.
B. increase the voltage.
O C. decrease the current.
O D. increase the resistance.
Which of the following biogeochemical cycles does not contain a molecule in a gaseous state?
What are the top 5 states which consume the most turkey
Answer:
Based on Google Trends, the search term “turkey” is most popular in the states of Tennessee, Pennsylvania, and New Hampshire, with Indiana and Vermont rounding up the top 5.
Californians consume the most turkey per capita of any state, while not being one of the top five. It's Missouri. It comes in at five. Minnesota is the state that produces the most turkeys, followed by North Carolina, Arkansas, and Virginia.
What is turkey ?Turkey, or the Republic of Turkey, is a transcontinental nation with the majority of its territory in Western Asia's Anatolia Peninsula and a tiny section in Southeast Europe's Balkan Peninsula.
The official name of Turkey is now Türkiye. The United Nations has officially accepted the adjustment requested by the Turkish government that the nation be referred to by its Turkish name.
Turkey is well-known for a variety of both oriental and European aspects, including the magnificent Hagia Sophia and traditional Turkish tea. Additionally, well-known are its carpets, hammams, bazaars, travel hotspots like Cappadocia and Istanbul, and sweets like baklava and Turkish delight.
Thus, Minnesota is the state that produces the most turkeys, followed by North Carolina, Arkansas, and Virginia.
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What mass of Cu(s) is electroplated by running 19.5 A of current through a Cu2 (aq) solution for 4.00 h
Answer:
92.46 g
Explanation:
The reaction is
[tex]Cu^{2+}+2e^-\rightarrow Cu[/tex]
I = Current = 19.5 A
t = 4 hours = [tex]4\times 60\times 60=14400\ \text{s}[/tex]
F = Faraday constant = 96485.33 C/mol
Molar mass of copper = 63.546 g/mol
Charge is given by
[tex]Q=It\\\Rightarrow Q=19.5\times 14400\\\Rightarrow Q=280800\ \text{C}[/tex]
Moles of electrons is given by
[tex]\dfrac{Q}{F}=\dfrac{280800}{96485.33}\\ =2.91\ \text{mol}[/tex]
Moles of copper is
[tex]\dfrac{1}{2}\times \dfrac{Q}{F}=\dfrac{1}{2}\times 2.91\\ =1.455\ \text{mol}[/tex]
Mass of copper would be
[tex]\text{Moles}\times \text{Molar mass of copper}=1.455\times 63.546\\ =92.46\ \text{g}[/tex]
The mass of copper electroplated is 92.46 g.
Choose the most electronegative atom from the following: K, Mg, As, CI
Potassium (K)
Chlorine (CI)
Arsenic (As)
Magnesium (Mg)
Answer:
Cl
Explanation:
Electronegativity increases as you move up and to the right of the periodic table. For example, Florine is the most electronegative element.
At constant pressure for which of the reactions shown below should Delta H be greater than Delta E°?
1.2 SO2(g) + O2(g) - 2 SO3(g)
II. C5H12(9) + 8 O2(g) - 5 CO2(g) + 6 H20(1)
III. H2(g) + Br2(g) → 2 HBr(9),
IV. N204(9) - 2 NO2(g)
Answer: [tex]N_2O_4(g)\rightarrow 2NO_2(g)[/tex] has higher value of [tex]\Delta H[/tex] than [tex]\Delta E[/tex]
Explanation:
The realtion between enthalpy change and internal energy change is:
[tex]\Delta H=\Delta E+\Delta n_gRT[/tex]
where,
= enthalpy of the reaction
= internal energy of the reaction
[tex]\Delta n_g[/tex] = change in the gaseous moles of the reaction = Moles of product - Moles of reactant
R = gas constant
T = temperature
1. [tex]2SO_2(g)+O_2(g)\rightarrow 2SO_3(g)[/tex]
[tex]\Delta n_g[/tex] = 2-3 = -1
2. [tex]C_5H_{12}(g)+8O_2(g)\rightarrow 5CO_2(g)+6H_2O(l)[/tex]
[tex]\Delta n_g[/tex] = 5-9 = -4
3. [tex]H_2(g)+Br_2(g)\rightarrow 2HBr(g)[/tex]
[tex]\Delta n_g[/tex] = 2-2 = 0
4. [tex]N_2O_4(g)\rightarrow 2NO_2(g)[/tex]
[tex]\Delta n_g[/tex] = 2-1 = 1
Thus reaction . [tex]N_2O_4(g)\rightarrow 2NO_2(g)[/tex] has higher value of [tex]\Delta H[/tex] than [tex]\Delta E[/tex]
At constant pressure the given reaction that shows ΔH would be greater than ΔE is;
IV); N₂0₄(g) → 2NO₂(g)
In chemistry, he meaning of ΔH and ΔE are;
- ΔH means the change in enthalpy, which is heat content.
- ΔE means the change in energy of a system.
Now, for a closed system the relationship between ΔH and ΔE is given by;
ΔH = ΔE + PΔV
where PΔV = ΔnRT
Thus; ΔH = ΔE + ΔnRT
where Δn = number of moles of product in the gaseous state - number of moles of reactants.
Thus, if Δn is negative, then ΔE would be greater than ΔH but if Δn is positive, then ΔH would be greater than ΔE
I) 2SO₂(g) + O₂(g) ⇒ 2SO₃(g)
number of moles of product = 2
number of moles of reactants = 2 + 1 = 3
Δn = 2 - 3
Δn = -1 and so ΔE would be greater than ΔH
II) C₅H₁₂(g) + 8O₂(g) ⇒ 5CO₂(g) + 6H₂0(l)
number of moles of product = 5 (6 is not used because water is in liquid and not gas)
number of moles of reactants = 8 + 1 = 9
Δn = 5 - 9
Δn = -4 and so ΔE would be greater than ΔH
III) H₂(g) + Br₂(g) → 2HBr(g)
number of moles of product = 2
number of moles of reactants = 1 + 1 = 2
Δn = 2 - 2
Δn = 0 and so ΔE would be equal to ΔH
IV) N₂0₄(g) → 2NO₂(g)
number of moles of product = 2
number of moles of reactants = 1
Δn = 2 - 1
Δn = +1 and so ΔH would be greater than ΔE
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Which of these are properties of metals? Select all that apply.
A. ductile
B. semiconductors
C. shiny
D. gases at room temperature
E. malleable
Answer:
E,A,D i beleve
Explanation:
im pretty sure thats what it is
Cu+2AgNO 3 Cu(NO 3 ) 2 +2Ag what are the reactants
Answer:
Cu + 2AgNo3 is the reactants
State what would most likely happen to the rate of enzyme action if the temperature were reduced by 10 degrees. Support your answer.
Answer:
Explanation:afa
you can answer this for free but im not asking im just saying- why does baby donald trump cartoon with out the funny faces look like boss baby- please dont tell me boss baby is donald trump it would ruin me
Answer:
who knows..
Explanation:
Answer:
oh wow- i-
Explanation:
Which has a smaller atomic radius: antimony (Sb) or bismuth (Bi)?
Under what conditions can a supersaturated solution be formed?
A- cool the solution back down to room temperature very carefully
B- cool the solution back down to room temperature haphazardly
C- leave the solution undisturbed as it is cooling
D- heat a solvent above room temperature
E- cool a solvent below room temperature
Answer:
E. Cool a solvent below room temperature
Explanation:
When a solution that has had more solute dissolved at a higher temperature is now cooled, it becomes supersaturated at the lower temperature. Because that supersaturated solution holds more solute than is stable at the lower temperature, crystals start to form.
To solve this we must be knowing each and every concept related to supersaturated solution. Therefore, the correct option is option E among all the given options.
What is supersaturated solution?The excess solute solution that the solvent can dissolve is known as a supersaturated solution. The substance that may dissolve in a solution, such as salts but not limited to salts, is referred to as a solution if we are unsure of what a solute or solvent is.
A solution becomes supersaturated at a lower temperature when it is cooled after having additional solute incorporated at a higher temperature. Crystals begin to form because the supersaturated solution contains more solute than would be stable just at lower temperature.
Therefore, the correct option is option E among all the given options.
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In an atomic model, what particals are found inside the nucleas of an atom. Thanks
Answer:
protons and nuetrons
Explanation: protons have a positive charge and nuetrons which have no charge together the make up the middle of an nuclues in a atom. i may be incorrect please tell me if i am
The reaction HNO3(aq) + NaOH(aq) ->NaNO3(aq) + H2O(l) is an example of _____?
Answer: It is a double displacement reaction sry I dont know an example of it tho
Explanation:
Please help!!!Which statement accurately describes relationship between weight and mass? If the picture is black just don’t answer
Answer:
A
Explanation:
Mass is a raw measurement, weight is effected by gravity
A student measures out exactly 0.0970 g of salicylic acid and carries out an aspirin synthesis using salicylic acid, acetic anhydride, heat, and an acid catalyst. Salicylic acid is the limiting reagent in this reaction, which yields 0.1030 g of aspirin. What is the percent yield for the reaction?
Answer: 106.19%
Explanation:
percent yield = actual/theo * 100%
our theoretical yield is the limiting reagent and then we have our actual given
.1030/.0970* 100% = 106.19%
The percent yield of prepared aspirin is 102.84%.
What is percent yield?Percent yield is defined as the ratio of actual yield to the theoretical yield multiplied by 100. If the actual and theoretical yield are same then the percent yield is 100%.If actual yield is less than the theoretical yield then the percent yield is less than 100%.Reason of this condition arising is the incompletion of reaction or loss of sample during recovery process.
In cases where percent yield is over 100% it indicates that more sample is recovered than the predicted amount.This condition arises when there are other simultaneous reactions taking place leading to the formation of product. It can also arise if there is incomplete removal of impurities from the sample .
By using the formula of percent yield , yield of aspirin is calculated as,
0.1030/0.1264 ×100=81.48%.
Thus, the percent yield of aspirin is 81.48%.
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which of the following disease is not transmitted by mosquito
(a) Dengue (b) Malaria (c)Bain fever (d)Pneumonia
pneumonia is not transmitted by mosquito
Two 1 kg masses are heated up on a hotplate for the same amount of time. One is made of copper, the other of iron. The copper one rises from 20°C to 30°C , but the iron one only goes from 20°C to 25°C. Explain why this happens.
Answer:
my explanation is best on conduction which is the process of heat being evenly distributed between or in metals and in this case copper absorbs heat faster than iron that's what I think
What is the correct formula that would result from the combination
of the two ionic species?
The correct formula : BeSO₄
Further explanationChemical formula shows the composition number of the constituent atoms
Polyatomic ion consists of 2 or more ions
The equal charge of the two ions will cancel each other out, while the different charges of the two ions will be crossed each other
Be²⁺ (monatomic ion) has a positive charge of +2, while SO₄²⁻ (polyatomic ion) has a negative -2 charge, so that the two charges with the same magnitude but with different charges cancel each other out so that the compound form is BeSO4
7 proton, 7 neutrons, 10 electrons
Answer: its nitride ion
Explanation:
What is the frequency of a photon that has a wavelength of 754 um?
Answer:
Explanation:
What is the frequency of a photon that has a wavelength of 754 um?
Which layer of the sun is responsible for producing the light shown in the picture above? Radiative zone Convective zone Photosphere Chromosphere
Answer:
Answer Expert Verified
The lights shown in the figure comes from the outermost layer of the Sun. This layer is called photosphere. This is the layer from where the light of the Sun is radiated, before travelling through space and reaching us.
Answer:
That guy is wrong, I believe it is c
Explanation:
During a chemical reaction, how do the substances that form differ from the substances that react?
I need serious help
Answer:
with what may I ask?
Explanation:
enshdufhd
Answer:
No teooobh the awnser is carrot
Explanation:
What is the answer please help
Answer: C
Explanation:
there should be 2 molecules which leaves A and C. But there should be 1 white circle and 3 black circles which means C is the right answer
What type of weathering causes mineral. composition of rocks to change?
A:chemical weathering
B:General weathering
C:Mechanical weathering
D:Permeable weathering
Answer:
Chemical weathering
Explanation:
which of these is the smallest unit?
ds
ks
cs
ms
Answer:
ks
Explanation:
Is it right