Answer:
D. A conductor that has less conductivity than do metallic conductors.
Explanation:
hope it helps .
To solve this we must be knowing each and every concept related to semiconductor. Therefore, the correct option is option D among all the given options.
What is semiconductor?A semiconductor is indeed a crystalline solid substance with electrical conductivity intermediate between that of a conductor and that of an insulator. Semiconductors are primarily utilized in the production of electronic devices such as capacitors, semiconductors, diodes, integrated circuits, and so on.
Semiconductors are frequently employed in numerous technologies because to their dependability, interoperability, power efficiency, and low cost. Semiconductors are also employed in the production of batteries, image devices, light emitters, and other electronic devices. Semiconductor is a conductor that has less conductivity than do metallic conductors.
Therefore, the correct option is option D.
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Select the correct answer.
Consider an atom that has an electron in an excited state. The electron falls to a lower energy level. What effect does that have on the electron?
ОА
ОВ.
The electron releases energy in the form of light.
The electron absorbs energy in the form of light.
The electron retains its energy without any change.
Ос.
OD
The electron transfers its energy to other electrons.
Reset
Next
Answer:
the electron releases engery in the form of light
Explanation:
it's science i don't know how to explain sorry
Answer:c
Explanation:
What are the units of molality? A. mol/kg B. g/mol C. mol/L D. kg/mol
Answer:
A. mol/kg
Explanation:
hope it helps .
what causes the difference genetically identical organisms
Answer:
the epigenetic perspective. ... Such variation among organisms with virtually identical chromosomal DNA sequences has largely been attributed to the effects of environment.Explanation:
which diagram(s) represents the bonding pattern of metals? a)A and B
b)C and D
c)A
d)C
the other guy is totally wrong. the answer is a for sure. C is showing a covalent bond between 3 atoms. Metals bond differently. Like shown in a and b. However b is innacurate because it shows the electrons being the largest(since they are negatively charged and there is a - sybmol), and we all know protons are much larger than electrons. SO a is correct because it depicts the positive protons(+ symbol) as the biggest. So go with a.
In the electron configuration for scandium (atomic number 21), what is the
notation for the three highest-energy electrons?
Select one:
O a. 30% 452
O b. 453
O c. 3d3
O d. 452 4p?
Answer:
Explanation:
d. 452 4p
hope it helps
Atoms are very small. Approximately how many atoms would it take to
make a stack as thick as a potato chip?
A. Thousands
B. Hundreds
C. Billions
D. Millions
Reset Selection
Answer:
Billions
Explanation:
A full stop contains almost trillion of atoms.
Billions of atoms would it take to make a stack as thick as a potato chip. Hence, option C is correct.
What are atoms?An atom consists of a central nucleus that is usually surrounded by one or more electrons.
Billions of atoms would it take to make a stack as thick as a potato chip. Hence, option C is correct.
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Which of the following is a combustion reaction?
O A. CO2 + H2O + H2CO3
O B. CzHg + 502 → 3002 + 4H20
O C. MgSO4 + Ba → BaSO4 + Mg
D. NaOH + HCl → NaCl + H2O
How many grams of KCl will dissolve in 100g H2O at 40°C?
Answer:
5 grams
Explanation:
What type of energy is the sum of an object’s potential and kinetic energy? -mechanical energy -electromagnetic energy -chemical energy -thermal energy
Answer:
A on EDG 2020
Explanation:
Got it right :)
The energy is the sum of an object’s potential and kinetic energy is mechanical energy. Therefore, option A is correct.
What is mechanical energy ?The term mechanical energy is defined as the sum of an object's potential energy and kinetic energies. As an object falls down its potential energy will be decreases, while its kinetic energy will be increases.
Whenever potential energy and kinetic energy are combined, they formed total mechanical energy. Mechanical energy is the energy that an object has due to its motion and due to its position. Energy of motion is called as kinetic energy, and energy of position or shape is called as potential energy.
Thus, Mechanical energy is the sum of an object's kinetic energy and potential energy, option A is correct.
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Question 25:-
A, YA are two isotopes of element A.
Difference between the number of neutrons
in the isotopes is?
Answer : The correct option is, (c) 1
Explanation :
Isotope : It is defined as the element that have the same number of protons but have the different number of neutrons of each of the atom.
Isotope notation : It is also called as nuclear notation. In isotopic notation we can easily determine an isotope's mass number, atomic number, the number of neutrons and protons in the nucleus.
The general isotopic representation of an atom is: [tex]_Z^A\textrm{X}[/tex]
where,
Z = Atomic number of the atom
A = Mass number of the atom
X = Symbol of the atom
As we are given two isotopes:
[tex]^{y}_{x}A[/tex] and [tex]^{y+1}_{x}A[/tex]
From this we conclude that,
The number of neutrons in isotope [tex]^{y}_{x}A[/tex] = y-x
The number of neutrons in isotope [tex]^{y+1}_{x}A[/tex] = (y+1)-x
Difference between the number of neutrons in the isotopes = [(y+1)-x] - [y-x] = 1
Therefore, the difference between the number of neutrons in the isotopes is 1.
Consider the following reversible reaction.
Answer:
B is the correct option
Explanation:
K= the ratio of product of concentration of products to the product of concentration of reactants raised to power equal to their cofficients.
Answer:
aaaaa
Explanation:aaaaaaa
Kool-Aid is made up of sugar (C6H12O6), food coloring, and water. It is an example of a(n)
element
heterogeneous mixture
homogeneous mixture
compound
8. What is an energy level?
A)The region outside the nucleus where the neutron is likely to be moving.
B)The region outside the nucleus where the electron is likely to be moving.
C)The region outside the nucleus where the proton is likely to be moving.
D)The region inside the nucleus where the electrons are located.
Answer:
B. The region outside a nucleus where the electron is moving
Explanation:
The more the electron moves, the higher energy level it has, the slower the electron moves the lowwer energy level it has.
Answer:
Energy levels (also called electron shells) are fixed distances from the nucleus of an atom where electrons may be found. Electrons are tiny, negatively charged particles in an atom that move around the positive nucleus at the center. Energy levels are a little like the steps of a staircase. You can stand on one step or another but not in between the steps. The same goes for electrons. They can occupy one energy level or another but not the space between energy levels.
:D
39. Which of the following substances are insoluble in water? Select all that apply.
A)Li2CO3
B)BaSO4
C)Mg3(PO4)2
D)КОН
Answer:
B) BaSO₄ and C) Mg₃(PO₄)₂
Explanation:
We can use the solubility rules to decide which substances are insoluble.
You have probably learned NAG SAG and "Cats Cradle Old People," Sally Said.
I've listed them below.
[tex]\begin{array}{lll}\textbf{Soluble} & \textbf{Insoluble}\\\textbf{N}\text{itrates} &\textbf{C} \text{arbonates }\\ \textbf{A}\text{cetates} & \textbf{C}\text{hromates}\\ \textbf{G}\text{roup 1} & \textbf{O}\text{ hydrOxides}\\ & \textbf{P} \text{hosphates}\\\textbf{S}\text{ulfates} &\textbf{S} \text{ulfites}\\ \textbf{A}\text{mmonium}& \textbf{S}\text{ulfides}\\\textbf{G}\text{roup 17} & \\\end{array}[/tex]
These aids help you remember that:
The salts of Group 1 metals are soluble (Li₂CO₃ and KOH).
Sulfates are usually soluble, except for BaSO₄. Thus, BaSO₄ is insoluble.
Phosphates are insoluble — Mg₃(PO₄)₂
The two insoluble compounds are BaSO₄ and Mg₃(PO₄)₂.
An element is:
A. A compound formed when different atoms react and form bonds with each other.
B. A pure chemical compound consisting of multiple atomic numbers.
C. A pure chemical substance consisting of one type of atom.
D. Two or more compounds that are mixed together but not chemically bonded.
Reset Selection
Which type of molecules is shown below? A. Lipid B. Nucleic acid C. Carbohydrate D. Amino acid
Amino acid is the type of molecule shown in the image.
What is an amino acid?Amino acids are small molecules that are the building blocks of proteins.
Amino acids are the smaller component pieces, called monomers, that are joined together to make the longer strand, or polymer, which is a protein. Amino acids are joined by covalent bonds called peptide bonds to make a polypeptide chain, which eventually creates proteins in our cells. There are 20 different amino acids in our cells that come together in a unique order to create the proteins organisms need.
Hence, an amino acid is the type of molecule shown in the image.
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What is the latent heat of vaporization?
A. The energy required to break molecular bonds
B. The energy required to go from a liquid to a gas
C. The energy required to go from a solid to a liquid
D. The energy required to go from a solid to a gas
B
The arrangement of a substance's molecules changes when it changes phases, but its temperature remains constant. The substance absorbs thermal energy from its surroundings to undergo a phase shift if the new arrangement has a larger thermal energy content. The substance releases thermal energy onto its surroundings if the new arrangement contains less thermal energy.
A substance's physical characteristic is its latent heat of vaporization. Its definition is the amount of heat needed to transform a single mole of liquid at its boiling point at mean atmospheric pressure. It is stated in terms of kg/mol or kJ/kg. The energy causes a liquid substance to transition from a liquid form to a vaporous one.
What determines an element's emission spectrum?
O A. The size of the sample
O B. The mass of the nucleus
O C. The electron energy levels
O D. The number of protons
An elements's emission spectrum determines the electron energy levels and the correct option is option C.
An element's emission spectrum is determined by the specific energy levels of its electrons. When an electron in an atom transitions from a higher energy level to a lower energy level, it releases energy in the form of electromagnetic radiation.
The wavelength and frequency of this emitted light correspond to specific energy differences between the electron energy levels. Each element has a unique arrangement of electron energy levels, leading to a distinct emission spectrum.
By analyzing the emitted light, scientists can identify the element and gain insights into its atomic structure. The size of the sample, mass of the nucleus, and number of protons do not directly determine an element's emission spectrum.
Thus, the ideal selection is option C.
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Which of the following is an accurate description of an ionic bond? Anions and anions attract. Cations and cations attract. Cations and anions attract. Atoms share electrons.
Answer:
Atoms of different elements, having gained or lost electrons, form negative and positive ions that are bonded together by attractive forces between ions with opposite charges.
Explanation:
The atoms have different numbers of neutrons and the same number of protons. hope this helps you :)
The possible products of a double displacement reaction in aqueous solution are SrSO4 and NaCl. Which of these possible products will form as a solid in this reaction? Question 8 options: A) SrSO4 B) Neither compound will form as a solid C) Both compounds will form as a solid D) NaCl
Answer:
SrSO4
Explanation:
According to solubility rules, we know that the sulphates of the elements of group two are insoluble in water. The solubility rules describe what chemical species are soluble in water and what species are not soluble in water.
Generally, all chlorides are soluble in water with exception of chlorides such as silver chloride. The chlorides of group one elements are usually highly soluble in water.
Since SrSO4 is a sulphate of a group two element (strontium) it will be the insoluble solid product of the double displacement reaction described in the question.
Answer:
SrSO4
According to solubility rules, we know that the sulphates of the elements of group two are insoluble in water. The solubility rules describe what chemical species are soluble in water and what species are not soluble in water. Generally, all chlorides are soluble in water with exception of chlorides such as silver chloride. The chlorides of group one elements are usually highly soluble in water.
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Dogs can have different coloured coats, this is known v________
Answer:
Genes Rule
Explanation:
The color of a dog's coat is basically at the mercy of his gene pool. Genes do two things that determine a dog's appearance. They control the pigments produced (eumelanin and phaeomelanin) and where these pigments are produced.
In what order do electrons fill orbitals?
A. The p orbitals full before the s orbitals in an energy level
B. Before pairing 1 electron occupies each s and p orbital
C. Electrons fill orbitals in order of increasing orbital energy
D. Orbitals s,p and then d fill in one energy level before starting the next
Electrons fill orbitals in order of increasing orbital energy. orbital is also known a wave function.
What is orbital ?An atomic orbital is a function that describes the position and wave-like activity of an electron in an atom in terms of both atomic theory and quantum mechanics.
This function may be used to determine the likelihood of discovering any atom's electron in any certain area surrounding the nucleus.
There are four different sorts of orbitals are s, p, d, and f, each named after a sublevel of energy. The energy of the electrons in each sort of orbital determines its particular form.
The form of the s orbital is spherical.There are three p orbitals with different three-dimensional axes of orientation.
Thus, option C is correct.
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Which describes a climate effect on the rate of weathering? Cold climates favor mechanical weathering. Chemical reactions occur slower at higher temperatures. Lower precipitation levels lead to more chemical reactions. The chemical reaction rates of minerals are not impacted by temperature.
Answer:
the answer is Cold climates favor mechanical weathering.
Explanation:
I got 100% on the Quiz
Statement that describes climate effect on the rate of weathering as regards this question is A:Cold climates favor mechanical weathering.
Weathering can be regarded as disaggregation of rocks into smaller bits by the actions of agents of weathering such as man, animals, water and so on.However, climate can also have effect on the rate of weathering, when there is cold climate, mechanical weathering is favoured.Option B,C,D are wrong because high temperature brings about increase in rate of chemical weathering.
Therefore, option A is correct.
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The world's record for the largest cup of coffee was broken on October 15, 2010 with a 2010 gallon cup of coffee in Las Vegas, Nevada. If a cup of coffee contains 318 mL of coffee, how many cups of coffee would be required to fill the world record coffee cup?
Answer: 23927 cups of coffee would be required to fill the world record coffee cup.
Explanation:
Volume of cup of coffee = 318 ml
Volume of largest cup (world record coffee cup) of coffee = 2010 gallon
Volume of largest cup of coffee in ml = [tex]2010\times 3785.41=7608678ml[/tex] ( 1 gallon = 3785.41 ml)
To find : Number of cups of coffee to fill world record coffee cup = x
Thus as we know :
[tex]{\text {Number of cups of coffee to fill world record coffee cup}}\times {\text {Volume of cup of coffee}}={\text {Volume of largest cup (world record coffee cup) of coffee}}[/tex]
Putting in the values we get:
[tex]x\times 318ml=7608678ml[/tex]
[tex]x=23927[/tex]
Thus 23927 cups of coffee would be required to fill the world record coffee cup.
Energy is involved in some way in all chemical reactions. Which type of reaction involves the absorption of energy from the surroundings? Options: exothermic reactions endothermic reactions
Answer:
endothermic reaction
Explantion:
The definition for endothermic is:
describing a process that involves the absorption of energy from the surroundings by substances undergoing change.
Think of en-dothermic as energy entering and ex-othermic as energy exiting.
Answer:
Endothermic
Explanation:
On Edge :)
Who is correct? Reggie, because baking and melting cause bonds to be broken, leading to a chemical change. Reggie, because objects that are heated always undergo chemical changes. Charlotte, because melting objects only sometimes cause a chemical change. Charlotte, because baking causes a chemical change, but melting objects is a non-chemical change.
Answer: Charlotte, because baking causes a chemical change, but melting objects is a non-chemical change.
Explanation: Baking is a chemical change you cant turn it back to what it was before. Its chemical properties have changed. Melting is a physical change. Its chemical properties are still the same it has not changed. It just changed it's physical form but the object is still the object.
Answer:
Charlotte, because baking causes a chemical change, but melting objects is a non-chemical change.
Explanation:
took the quiz on edge
Peas contain 250 kJ per 100 g. You would use the equivalent of 600 g of peas if you slept for .
Answer: 7,793 hours.
Explanation:
Let's assume you are about 150 pounds. You would use only 414 calories a night (1.7 kJ). If 250 kJ is 100 g, then 1500 kj is 600 g. So we would need 360000 calories to be eaten. You would have to sleep for about 7,793 hours.
Match the condensed structural diagrams with the correct names
I. CH3-CH2-COOH
II. CH3-CH2-OH
III. CH3-COO-CH2-CH3
IV. CH2OH-CH2-CH3
V. CHOO-CH3
VI. CH3-COOH
46. Ethanol
47. Propyl ethanoate
48. Propan 1-Ol
49. Propanoic acid
50. Ethanoic acid
51. Methyl methanoate
Question related to above)
For each of the waters provided, identify the alcohol and the carboxylic acid that reacted
52. Methyl propanoate (-)+ (-)
53. Ethyl methanoate(-) +(-)
Answer:
Here's what I get
Explanation:
1. Names
I. CH₃-CH₂-COOH = 49. propanoic acid
II. CH₃-CH₂-OH = 46. ethanol
III. CH₃-COO-CH₂-CH₂-CH₃ = 47. propyl ethanoate
IV. H-O-CH₂-CH₂-CH₃ = 48. propan-1-ol
V. H-COO-CH₃ = 51. methyl methanoate
VI. CH₃-COOH = 50. ethanoic acid
2. Precursors
52. methyl propionate ⇒ methanol + propanoic acid
53. ethyl methanoate ⇒ ethanol + methanoic acid
Who re-introduces Democritus' theory of atoms back into modern science in the 1800's?
Answer:
John Dalton with his atomic theory reintrodcued the theroy of atoms
Explanation:
Around 450 B.C., the Greek philosopher Democritus introduced the idea of the atom. However, the idea was essentially forgotten for more than 2000 years. In 1800, John Dalton re-introduced the atom. He provided evidence for atoms and developed atomic theory
Explanation:
what mass of mass phosphoric acid will be produced if 42.0 grams of water react
Answer:
4 mol H3PO4
Explanation: