The wave B has wavelength of 415 nm. The value for c is 3.00 x 10 8 m/s. The frequency is 7.22 x 10¹¹ Hz.
What is frequency?Frequency is defined as the number of waves passing through a fixed point in a given amount of time.
The frequency can also be defined as a repeated event is the number of occurrences per unit of time.
Frequency can be expressed as
f = c / ∧
Where c = 3.00 x 10⁸ m/s
∧ = 415 nm
So, f = 3.00 x 10⁸ m/s x 415 nm
f = 7.22 x 10¹¹ Hz.
Thus, the wave B has wavelength of 415 nm. The value for c is 3.00 x 10 8 m/s. The frequency is 7.22 x 10¹¹ Hz.
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A sample of an unknown solid is found to have a volume of 24.3 cm3 and a mass of
217.0 grams. What is the density of the unknown
Explanation:
Density = mass ÷ volume
= 217.0 g ÷ 24.3 cm³
= 8.93 g/cm³
∴ the unknown sample of mass 217.0 grams and volume of 24.3 cm³ has a density of 8.93 g/cm³.
what is a molecule?
HELPPP
Answer:
a molecule is a group of atoms/elements bonded together
Ill give brainlest to the one who answers right.
How long does it take Earth to make one rotation on its axis?
12 hours
48 hours
24 hours
Please answer ASAP
Answer:
24 hours
Explanation:
There are 24 hours in a day cause that is how long for the earth to spin on its axis
Answer:
24 hours
Explanation:
The time it takes Earth to rotate so the sun appears in the same position in the sky, known as a solar day, is 24 hours. However, the time it takes Earth to complete one full rotation on its axis with respect to distant stars is actually 23 hours 56 minutes 4.091 seconds, known as a sidereal day.
Disease caused by virus are more dangerous.Why?
Answer:
Explanation:
1. Virus's are hard to detect because of their simple construction.
2. Some mutate very easily.
3. It is hard to isolate the virus and kill it without doing damage to the host.
Which of the following molecules contains only single bonds?
(A)CH3CH2COOH
(B) CH3COCH3
(C) HCN
(D)C2H6
(E) CO2
Answer:
D) C2H6
Explanation:
All the other molecules contain double (or triple) bonds except for C2H6.
Hòa tan hoàn toàn 1,93 gam hỗn hợp 2 kim loại Fe và Al vào dd HCl dư, sau phản ứng thu được m gam muối và 1,456 lít khí H2 ở đktc. Giá trị của m là:
Answer:
Sorry pal! Didn't understand your language.
:(
Explanation:
Learning Task No. 3: Complete the following sentences by filling in the appropri-
help asap ??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
Answer:
Option C
Explanation:
Something white solid forms means here is any salt reacted .And it has been reacted with any hydroxide or acid or another salt. And an undissolved solid product formed.which is white.Its totally chemical change
what term is used to describe alkaline hydrolysis of fats and oils
Answer:
Saponification
Explanation:
When treated with a base such as NaOH, the ester is transformed back to alcohol and the sodium salt of carboxylic acid. Saponification is the name given to the reaction since it is utilized in the production of soap.
Electrons are transferred from one atom to another.
Options:
Ionic Bond or Covalent Bond?
Answer:
ionic
Explanation:
ionic transfer of e^- ions formed (charges)
ionic=non-metal+ metal
ex: F+Ca
covalent sharing e^- no true charges
covalent= non-metal+ non-metal
ex: F+P
( my notes)
HELP MEEE
What is the identity of the atom shown?
A) Fluorine
B) Neon
C) Nitrogen
D) Potassium
15 POINTS
Answer:
A FLUORINE
Explanation:
Explanation:
Option A, Fluorine is the correct answer, because it has 9 electrons in its shells.
hope this helps you.
in an oxidation-reduction reaction, how is the reducing agent changed?
Explanation: The additional terminology comes from the definition that, within redox processes, a reductant transfers electrons to an oxidant; hence, the reductant (reducing agent) loses electrons, so is oxidized, while the oxidant (oxidizing agent) gains electrons, so is reduced.
In an oxidation-reduction reaction, the reducing agent loses electrons and loses potential energy, Therefore, option (C) is correct.
What is a reducing agent?A substance that loses its electrons in a redox reaction to other substances and gets oxidized is called a reducing agent. A reducing agent is one of the reactants which reduces the other reactant by donating the electrons to the reactant of an oxidation-reduction reaction.
If the reducing agent can't pass electrons to another reactant in a reaction, then the reduction process does not occur and the reaction cannot proceed.
In redox reactions, when an electron loses potential energy as a result of the transfer and energy is released. Electrons with more potential energy are associated with less electronegative atoms and less potential energy is associated with a more electronegative atom (such as O).
Therefore, the reducing agent loses electrons and loses potential energy in a redox reaction.
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Your question is incomplete, but probably the complete question was,
In an oxidation-reduction reaction, how is the reducing agent changed?
(A) it gains electrons and gains potential energy
B) it gains electrons and loses potential energy
C) it loses electrons and loses potential energy
D) it loses electrons and gains potential energy
carbon cycle carbon cycle
Hope you could get an idea from here.
Doubt clarification - use comment section.
which of the following atoms is most likely to bond with another atom?
Answer:
c. chlorine, with an outer electron shell filled with 7 of a possible 8 electrons
Explanation:
Hope this helps!
The structure in the option A has 7 electrons in the outer shell of its electronic configuration , is unstable and so is most likely to form bond with another atom.
What is electronic configuration ?Electrons are arranged in various shells around the nucleus , this arrangement is called electronic structure or configuration.
Each shell can occupy certain fixed number of electrons.
Beside Option A , all the other configurations show stable structures as the last shell has eight electrons and are stable according to the octet rule.
The structure in the option A has 7 electrons in the shell and so is most likely to form bond with another atom.
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Someone pls help me I will make you brain
Answer:
human migration
Explanation:
Answer:
I think its D
Explanation:
help me plsss yall??????
Answer:
First one answer is physical and other remaning chemical
Answer:
Hydrogen is a colorless, tasteless, and odorless gas.
physical
--------------------------------------------------------------------------------------------------------------
Hydrogen is very combustible in the presence of oxygen.
chemical
--------------------------------------------------------------------------------------------------------------
Hydrogen is very reactive with most elements.
chemical
--------------------------------------------------------------------------------------------------------------
Hydrogen is the least dense of all elements.
physical
Briefly discuss the 3 most important properties of metals
Answer: Luster: Metals are shiny when cut, scratched, or polished.
Malleability: Metals are strong but malleable, which means that they can be easily bent or shaped.
Conductivity: Metals are excellent conductors of electricity and heat.
Explanation: Hope this helped!
relative to electrons and electron states, what does each of the four quantum numbers specify
Answer:
(n, l, m sub l, m sub s)
N: principle quantum number (1,2,3,4,etc)
l: angular momentum quantum number, the shape (l has to be at least 1 less than n, but can be 0 depending on n)
M sub l: magnetic quantum number (l determines this number)
M sub s: spin quantum number (can only ever be 1/2 or -1/2)
Explanation:
The principle, azimuthal, magnetic, and spin quantum numbers specify the principle shell, the shape of the orbital, the number of orbitals, and electron spin respectively.
What are the quantum numbers?The set of numbers that describes the position and energy of the electron are called quantum numbers. Four quantum numbers are principal, azimuthal, magnetic, and spin quantum numbers.
Principal quantum numbers (n) designate the principal electron shell of the atom and the most probable distance between the nucleus and the electrons. A larger value of the principal quantum number indicates a large distance between the electron and the nucleus.
The azimuthal quantum number (l) describes the shape of an orbital in which an electron is present. Its value is equal to the total number of angular nodes in that orbital.
The magnetic quantum number describes the total number of orbitals in a subshell and the orientation of these orbitals. The value of the spin quantum number (s) offers the direction in which the electron is spinning and it has only two possible values +½ and -½.
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1
2. How does a detergent remove a stain?
?
Answer:
By using various chemical compounds to lift the stain while being gentle enough to keep fabric intact.
Cho 200 g dung dịch NaCl 0,5M tác dụng hết với 400 ml AgNO3. Sau phản ứng thu được kết tủa và dung dịch không màu
a, Viết phương trình hóa học xảy ra?
b, Tính khối lương kết tủa tạo thành
c, Tính nồng độ mol của dung dịch AgNO3 đã tham gia phản ứng.
Answer:
Explanation:
a. NaCl+ AgNO3-----> NaNO3+ AgCl
b. Số mol của NaCl= 0,2*0,5= 0,1 (mol)
------> Số mol của kết tủa AgCl tạo thành= 0,1 mol (dựa vào phương trình hóa học)
-----> Khối lượng của kết tủa AgCl tạo thành= 0,1*143,5=14,35(g)
c. Số mol của AgNO3= số mol của NaCl= 0,1 (mol)
------> Nồng độ mol của dd AgNO3 đã tham gia phản ứng= [tex]\frac{0,1}{0,4}[/tex]=0,25(M)
any atom is most stable when it’s outermost energy level contains
Explanation:
Atoms are at their most stable when their outermost energy level is either empty of electrons or filled with electrons. Sodium atoms have 11 electrons. Two of these are in the lowest energy level, eight are in the second energy level and then one electron is in the third energy level.
Any atom is most stable when it’s outermost energy level contains eight electrons.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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Which statement describes a characteristic of a question that can be answered through scientific inquiry
the correct one is D
which particles are in the nucleus of an atom of neon-20?
is a skateboard matter or no matter
Answer:
it is matter cus everything is made up of matter
Explanation:
Answer: yes
Explanation:
Matter makes up everything
write down ten laboratory safety rules
laboratory safety rules:
~Avoid wye contact with all chemics
~ Avoid skin contact with all chemicals
~Always wear safety glasses
~Don't eat in the lab
~Don't drink anything in the lab
~Avoid wearing jewellery
~Don't taste or sniff any chemicals
~Kn0w emergency exit routes
~Never leave containers of chemicals open
~Avoid distracting anyone else working in the lab
Hope this helped you- have a good day bro cya)
Which of the following statements is true?
a. An ion is negative if it has more protons than it
has electrons.
b. An ion is negative if it has more electrons than
it has protons.
c. An ion is neutral if it has an equal number of
electrons and protons.
d. An ion is positive if it has more electrons than it
has protons.
e. An ion is positive if it has more protons than it
has neutrons.
Answer:
E- an ion is positive if it has more protons than it has neutrons
Which of the following particles are found in the nucleus of an atom? (Select all that apply).electronsprotonsneutronscompounds
Answer:
protons and neutrons
Explanation:
Neutrons and protons are the particles that are found in the nucleus of an atom.
What are protons and neutrons?Protons and neutrons are subatomic particles. They are present in the nucleus of an atom and constitute most of the mass of the atom. There are three kinds of subatomic particles that are present in an atom.
These are -
Electrons: Electrons are negatively charged particles. These are present in the atomic shells of the atom. The number of electrons in the last shell of the atom constitutes the valency of the atom. Protons: Protons are positively charged particles. These are present in the nucleus of the atom.Neutrons: Neutrons are neutral molecules with no charge. These are also present in the nucleus of the atom.Since most of the mass of the atom, in the form of protons and neutrons, is present in the nucleus, the mass number is denoted as the sum of the number of protons and neutrons. Protons and neutrons together are sometimes also called nucleons.
Therefore, neutrons and protons are present in the nucleus of an atom.
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what is responsible for changes in the state of matter?
and how are
the molecules of a liquid different from that of a solid? PKSS HELOOOÑLPPPP
Answer:
Temperature and pressure are the two factors which are responsible for change in state of matter.
Solid – In a solid, the attractive forces keep the particles together tightly enough so that the particles do not move past each other. ... In the solid the particles vibrate in place. Liquid – In a liquid, particles will flow or glide over one another, but stay toward the bottom of the container.
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what is the wavelength of microwaves if the frequency is 2.45x 10^9 HZ?
Wavelength = Speed of Light ÷ Frequency
= (2.99 × 10⁸ m/s) ÷ ( 2.45 × 10⁹ /s)
= 1.22 × 10⁻¹ m
The wavelength of a light of frequency 2.45 × 10⁹ /s is 1.22 × 10⁻¹ m.
Notes:
Hz ≡ /s