Answer:
Explanation:The volume of the box is 8.6 × 10³ in².
V = lwh = 26 in × 18.4 in × 17.92 in = 8.6 × 10³ in²
Note: The answer can have only two significant figures because that is all you gave for the length of the box.
bezglasnaaz and 23 more users found this answer helpful
Naturally occurring Indium has two isotopes.
4.28
%
4.28
%
of the atoms are
Indium
−
113
Indium
-
113
(
113
In
113
In
) with a mass of
112.9
u
112.9
u
and
95.72
%
95.72
%
of the atoms are
Indium
−
115
Indium
-
115
(
115
In
115
In
) with a mass of
114.9
u
114.9
u
. Calculate the average atomic mass of Indium with the correct number of significant figures.
Answer:
Average Molar mass is 114.8u
Explanation:
» From the formula of average Relative Atomic Mass [ RAM ]
[tex]{ \rm{RAM = \sum \frac{(isotopic \: mass \times \%abundance)}{100} }} \\ [/tex]
» We have two isotopes of Indium,
Indium-113, mass » 112.9u, % » 4.28%Indium-115, mass » 114.9u, % » 95.72%[tex]{ \tt{RAM = \frac{ \blue{(112.9 \times 4.28)} + { \green{(114.9 \times 95.72)}}}{100} }} \\ \\ { \tt{RAM = \frac{11481.44}{100} }} \\ \\ { \underline{ \underline{ \tt{ \: RAM = 114.8\: }}}}[/tex]
Draw a wax structure with the lauric acid + hexadecan-5-ol.
Wax is formed from the combination of alcohol and fatty acid.
Structure of wax, lauric acid and hexadecaneA wax is a type of lipid which is formed from the alcohol and a fatty acid in which alcohol contains about 12-32 carbon atoms while on the other hand, Lauric acid is a fat that is found in many vegetable fats and also use by people as medicine.
Hexadecane is an alkane hydrocarbon which consists of a chain of 16 carbon atoms and 34 hydrogen atoms. Its chemical formula is C₁₆H₃₄.
In conclusion, we can say that wax is formed from the combination of alcohol and fatty acid.
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why must you replace the lids of chemicals immediately
Classify what type of reaction occured in these 3 problems.
1. Hg0------Hg+02 is a decomposition reaction
2.Ca+H20------Ca(OH)2+H2 is a combination reaction
3. KBr+ Cl2-----KCl+Br2 is a displacement reaction
please choose me as BRAINLIEST
Which of the following personal protective equipment (PPE) items should be donned first when garbing to prepare a compounded sterile preparation (CSP)? a) Shoe coyers b) Face shield c) Face mask d) Head cover
The first PPE to be worn when making a CSP is the face shield.
What is CSP?The acronym CSP stands for compounded sterile preparation. It is often used for sterilization and is made from non-sterile components.
Due to the harmful nature of the compounded sterile preparation, the first personal protective equipment (PPE) to be donned when preparing it is the face shield.
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Please help I’m marking branlist please
Answer:
The answer would be B
Explanation:
It has a different definition than the other options
QUESTION 33
If a 100.-g sample of a metal has a volume of 8.65 mL, what is the density of the metal?
O a, none of these
O b. 11.6 g/mL
c. 0.0865 g/mL
Od 1.16 g/mL
O e. 9 g/mL
Answer:
B.
Explanation:
Density = mass / volume
mass = 100 grams
volume = 8.65 mL
Density = 100 / 8.65 = 11.56 B.
Calculate the fraction of atom sites that are vacant for copper at its melting temperature of C (1357 K). Assume an energy for vacancy formation of 0.90 eV/atom
The fraction of the atom that are vacant for the copper atom at its melting temperature is [tex]4.57\times 10^{-4}[/tex].
Fraction of the vacant atom
The fraction of the atom that are vacant for the copper atom at its melting temperature is determined using the equation below;
[tex]\frac{N_v}{N} = e^{(\frac{-Q_v}{KT} )[/tex]
where;
Qv is the vacancy formation of the copper = 0.9 eV/atomK is Boltzmann constant = 8.62 x 10⁻⁵ eV/atom.KT is the temperature = 1357 KThe fraction of the atom that are vacant for the copper atom at its melting temperature is calculated as follows;
[tex]\frac{N_v}{N} = e^{(\frac{-0.9}{8.62 \times 10^{-5} \times 1357} )}\\\\\frac{N_v}{N} = 4.57\times 10^{-4}[/tex]
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What is the wavelength (in nm) of a 3 eV photon?
Answer:The wavelength of a photon with energy 3.0 eV is 413.57 nm and it is for visible light. This wavelength is of ultraviolet light.
Explanation:
We are given –
Energy of photon is = 3 eVTo find the wavelength of photon we have to use the Planck Expression.
[tex]\qquad[/tex] [tex]\star\: \: \pink{\boxed{\frak{ E = hf}}}[/tex]
[tex]\qquad[/tex][tex] \bf \longrightarrow E = hf [/tex]
[tex]\qquad[/tex][tex] \sf \longrightarrow E = h \times \dfrac{c}{\lambda} \: \: \purple{\bigg(\because f = \dfrac{c}{\lambda}\bigg)}[/tex]
Where, E is the energy of photon and f is the frequency of photon & h's called Planck Constant.
[tex]\qquad[/tex][tex] \sf \longrightarrow h = 6.63\times 10^{-34} \:Js[/tex]
[tex]\qquad[/tex] Speed of light, c =[tex]\sf 3\times10^{8} \:m/s[/tex]
[tex]\qquad\qquad\quad\underline{\sf{Substituting \ Values \ :}}[/tex]
⠀⠀⠀━━━━━━━━━━━━━━━━━━━━━━━━━━
[tex]\qquad[/tex][tex] \bf \longrightarrow E = h \times \dfrac{c}{\lambda} [/tex]
[tex]\qquad[/tex][tex] \bf \longrightarrow \lambda = \dfrac{hc}{E}[/tex]
[tex]\qquad[/tex][tex] \sf \longrightarrow \lambda = \dfrac{ 6.63\times 10^{-34}\times 3\times 10^{8}}{ 3eV}[/tex]
[tex]\qquad[/tex][tex] \sf \longrightarrow \lambda = \dfrac{ 6.63\times 10^{-34}\times 3\times 10^{8}}{ 3 \times 1.6\times 10^{-19}}\: \:\purple{ \bigg(\because 1 eV= 1.6\times 10^{-19} J\bigg)}[/tex]
[tex]\qquad[/tex][tex] \sf \longrightarrow \lambda = \dfrac{ 6.63 \times \cancel{3}\times 10^{-34+8}}{\cancel{3}\times 1.6\times 10^{-19}}[/tex]
[tex]\qquad[/tex][tex] \sf \longrightarrow \lambda = \dfrac{ 6.63 \times 10^{-26}}{1.6\times 10^{-19}}[/tex]
[tex]\qquad[/tex][tex] \sf \longrightarrow \lambda = 4.144 \times 10^{-26+19}[/tex]
[tex]\qquad[/tex][tex] \sf \longrightarrow \lambda = 4.144 \times 10^{-7}[/tex]
[tex]\qquad[/tex][tex] \sf \longrightarrow \lambda = 4.144\times 10^{-7}\: m[/tex]
[tex]\qquad[/tex][tex] \sf \longrightarrow \lambda = 4.144 \times 10^{-7}\times 10^{9} \: nm\: \: \purple{\bigg(\because 1m = 10^9\: nm \bigg)}[/tex]
[tex]\qquad[/tex][tex] \sf \longrightarrow \lambda = 4.144 \times 10^{-7+9}\: nm[/tex]
[tex]\qquad[/tex][tex] \sf \longrightarrow \lambda = 4.144 \times 10^{2}\: nm[/tex]
[tex]\qquad[/tex][tex] \pink{\bf \longrightarrow \lambda = 414.4\: nm}[/tex]
Henceforth, wavelength will be 414.4nm.A compound contains 70.9% potassium and 29.1% sulfur, what is the empirical formula?
P2O5
P8O20
P6O15
P4O10
Answer:
i think its P6O15
Explanation:
What is the frequency of a 1 MeV gamma ray?
1 Mev = 1.602 x 10⁻¹³ J
E = hf
h = Planck's constant (6.626.10⁻³⁴ Js)
Input the value:
f = E : h
f = 1.602 x 10⁻¹³ J : 6.626 x 10⁻³⁴ Js
f = 2.42 x 10²⁰ Hz
Electromagnetic waves can carry more data at higher frequencies. Why would a scientist opt to transmit data at a lower frequency instead?
What are the limitations of sending information using electromagnetic waves?
Answer:
this is the reason why scientists opt to transmit data at lower frequency instead of electromagnetic even it can carry more data at a higher frequencies is because using higher frequencies of electromagnetic spectrum travel shorter distances but have higher data carrying capacity.So this physical characteristic of electromagnetic waves limits the range and availability of frequencies for sending information.
Explanation:
Communication refers to the process of conducting and obtaining information in the form of signals. The electromagnetic waves are used by the high technology communications systems, and there are different kinds of electromagnetic waves, which are utilized like microwaves, infrared, radio waves, and others.
However, there are some of the limitations with the applications of electromagnetic waves:
1. Due to a confined number of broadcast frequencies, the application of transmitters must be restricted in a certain manner or they will lead to interference.
2. The physical features like buildings and mountains can interfere or prevent certain transmissions.
3. In the air, the signals can be misleaded due to atmospheric conditions and the signals from the space are at certain occasions get distorted by solar activity.
plus someone answer
Explanation:
if the first one was just O, then:
i) no of moles = mass/ molar mass
2= m/ 16
m = 16*2
m = 32g
ii) the second answer would be the same.
help please please help me
Answer:
percentage is the given amount/total in solution times 100
Answers.
A (3.42/78.2)*100 = 4.37℅ ( 3 significant place )
B 21.98℅
C 13.7℅
The atomic weight of an atom is the sum of the mass of the particles in the nucleus of the atom. These particles are called?
a) electrons and neutrons
b) electrons and protons
c) neutrons and protons
d) electrons, protons, and neutrons
Answer:
c) neutrons and protons
Explanation:
The nucleus of the atom contains only neutrons and protons. Electrons are not in the nucleus but outside the nucleus in 'atomic orbitals'.
Hey l need help with math and reading
Answer:
I can try helping with math (I take honors math), and can definitely help with reading (I take AP literature composition)
Explanation:
Is this right? How to write potassium chloride plus sodium chloride?
Which statement is best supported by this scale? (LT 2)
(Insert Mohs Hardness scale)
Your answer:
A fingernail will scratch calcite, but not quartz.
A piece of glass can be scratched by calcite, but not quartz.
A piece of glass can be scratched by quartz, but not calcite.
Answer:
The answer is C I think..
Matter is defined as a substance made up of particles that has weight and can occupy space.
There are three main states of matter which include:
Solid: They have their particles vibrate in their fixed positions.
Liquid: The particles are generally slightly further apart than in a solids; and
Gas: particles are widely spaced and tend to be only slightly attracted to each other.
The windsurfer, his board, and his surroundings is made up of particles that are tightly packed together and vibrate in their fixed positions.
Therefore, the components that make up the windsurfer, his board, and his surroundings is matter.
Answer:
what is th question??????????
Which metal does not react with dilute hydrochloric acid?
A. Iron
B. Sodium
C. Zinc
D. Copper
Answer:
D. Copper
Explanation:
Less reactive metals like Copper, gold and silver does not react with dilute HCl to produce Hydrogen gas.
Answer:
D. Copper
Explanation:
Copper is less reactive than Hydrogen.
What volume would be occupied by 100. g of oxygen gas at a pressure of 1.50 atm and a temperature of
25 °C?
Answer:
Use PV = nRT. Don't forget T must be in kelvin.
Explanation:
I need help with this question. I dont understand. Please answer fully since there are 3 marks on question
Answer:
The alpha scattering experiment done by Rutherford proved that an atom is not a bowl of positively charge atom, where the electrons were evenly spread out inside it like the plum pudding model. This is because Rutherford discovered that the atoms are mostly empty space with the aplha particles passing straight through the foil. However, a small number of the alpha particles were deflected and bounced back; meaning that the center of the atom is were the mass was mostly concentrated with a positive charge nucleus.
Hope this helps!
The compound barium acetate is a strong electrolyte. Write the reaction when solid barium acetate is put into water.
Include states of matter in your answer.
Answer:
Explanation:
If any doubt comment your question or what needs clarification.
The compound barium acetate is a strong electrolyte. The reaction when solid barium acetate is put into water is written as
Ba(C₂H₃O₂)₂ --> Ba ²⁺ + 2 C₂H₃O₂⁻¹
Barium acetate has the molecular formula of Ba(C₂H₃O₂)₂. It is a strong electrolyte. Strong electrolytes are those substances which when dissolved in water dissociates into ions. So when this specific substance is placed into water, this compound simply dissociates into its corresponding ionic forms, that is shown below
Ba(C₂H₃O₂)₂ (s)--> Ba ²⁺ (aq) + 2 C₂H₃O₂⁻¹ (aq)
So here We must take note that the 2+ and 1- are the charges of the ion.
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Which of the following describes humidity?
1) The temperature of the air
2) The weight of the air pressing down on you
3) The amount of water vapor in the air
4) The direction the wind is blowing
Answer: 3) The amount of water vapor in the air.
3.
It was so hard
Explanation:
Nothing
What element is the electron configuration representing?
1s2 2s2 2p6 3s2 3p6 4s2.
Answer:
calcium
Explanation:
1s2 2s2 2p6 3s2 3p6 4s2
total number of electrons: 2+2+6+2+6+2=20
the atomic number of the element is 20
the element is calcium
The electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 represents the element calcium (Ca).
The electron configuration notation describes the distribution of electrons in the energy levels or orbitals of an atom. In this case, the numbers and letters indicate the specific orbitals and the number of electrons in each orbital.
Breaking it down:
1s2 represents the 1s orbital with 2 electrons.
2s2 represents the 2s orbital with 2 electrons.
2p6 represents the 2p orbital with 6 electrons.
3s2 represents the 3s orbital with 2 electrons.
3p6 represents the 3p orbital with 6 electrons.
4s2 represents the 4s orbital with 2 electrons.
Considering the filling order of orbitals and the number of electrons, the element with this electron configuration is calcium (Ca).
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Someone can help me please??
Answer:
gas heating
Explanation:
the rising curves are the states rising in tempurature while the flat sequences are the states of matter actually changing. A-b is the solid heating, then b-c is the melting (changing into liquid), c-d is liquid heating, then d-e is vaporizing, leaving e-f being gas heating.
edit: typo
Answer:
gas heating
Explanation:
that's all I hope it helps
How does the behavioral adaptation of leaves curling up when touched help a plant survive?
A-Helps generate toxins
B- Acts as a sheild
C- causes predators to lose interest
D-protects pollen
Please Help!!
Answer:
Acts as a sheild so b
Explanation:
Answer
:C- causes predators to lose interest
Explanation:
b was wrong i took the test
The term used to describe atoms chemically joined together is...
a. linked.
b. coupled.
c. fused.
d. bonded
Answer:
D. Bonded
Explanation:
The answer is D. Bonded.
I hope it helps! Have a great day!
Lilac~
Two atoms will likely form a polar covalent bond if the electronegativity difference is
a. 0.1.
b. 1.0.
c. 2.5.
d. 4.0.
Answer:
b. 1.0
Explanation:
Potassium Chlorate decomposes into Potassium Chloride and Oxygen.
What volume of oxygen gas does 9.32 grams of potassium chlorate produce at STP based on the equation shown?
Answer:In order to be able to calculate the volume of oxygen gas produced by this reaction, you need to know the conditions for pressure and temperature.
Since no mention of those conditions was made, I'll assume that the reaction takes place at STP, Standard Temperature and Pressure.
STP conditions are defined as a pressure of
100 kPa
and a temperature of
0
∘
C
. Under these conditions for pressure and temperature, one mole of any ideal gas occupies
22.7 L
- this is known as the molar volume of a gas at STP.
So, in order to find the volume of oxygen gas at STP, you need to know how many moles of oxygen are produced by this reaction.
The balanced chemical equation for this decomposition reaction looks like this
2
KClO
3(s]
heat
×
−−−→
2
KCl
(s]
+
3
O
2(g]
↑
⏐
⏐
Notice that you have a
2
:
3
mole ratio between potassium chlorate and oxygen gas.
This tells you that the reaction will always produce
3
2
times more moles of oxygen gas than the number of moles of potassium chlorate that underwent decomposition.
Use potassium chlorate's molar mass to determine how many moles you have in that
231-g
sample
231
g
⋅
1 mole KClO
3
122.55
g
=
1.885 moles KClO
3
Use the aforementioned mole ratio to determine how many moles of oxygen would be produced from this many moles of potassium chlorate
1.885
moles KClO
3
⋅
3
moles O
2
2
moles KClO
3
=
2.8275 moles O
2
So, what volume would this many moles occupy at STP?
2.8275
moles
⋅
22.7 L
1
mol
=
64.2 L
Explanation: