Answer:
5.0g/cm^3
Explanation:
Since we have the mass of the wood (25.0g) and the volume of the wood (5.0cm^3), can use the formula for density to answer this question.
Density=mass/density
Density=25.0g/5.0cm^3
Density=5.0g/cm^3
Therefore, the density of the piece of wood is 5.0g/cm^3.
I hope this helps!
i need the answer for this
Answer:
need points
Explanation:
The average speed of an oxygen molecule is 6.14 x 104 cm/sec at a certain temperature. What is the average speed of a CO2 molecule at the same temperature? (molar mass O2 = 31.9988; CO2 = 44.0098)
Answer:
the average speed of [tex]V_{av} CO_2[/tex] is 5.24 × 104 cm/s
Explanation:
The computation of the average speed of a [tex]CO_2[/tex] is as follows:
[tex]\sqrt{average} = \sqrt{\frac{8 RT}{\pi M} }[/tex]
where,
M = Molar mass
[tex]V_{av} = \frac{\sqrt{1}}{M}[/tex]
Given that
[tex]V_{av} \ of\ oxygen= 6.14 \times 10^4 cm/s[/tex]
The molar mass of oxygen i.e. (MO_2) = 31.9988 g/mol
And, the molar mass of CO_2 is 44.0098 g/mol
Now
[tex]\frac{V_{av} CO_2}{V_{av} O_2} = \frac{\sqrt{M_{O2} }}{M_{CO2}}[/tex]
Now place these values to the above formula
[tex]\frac{V_{av}CO_2}{6.14\times 104 cm/s} = \frac{\sqrt{31.9988} }{44.0098}[/tex]
So,
V_av CO_2 is 5.24 × 104 cm/s
hence, the average speed of [tex]V_{av} CO_2[/tex] is 5.24 × 104 cm/s
How many equivalents are in 0.70 mole of Fe 3+?
The number of the ions or the electrons transferable is called the number of equivalents. The number of equivalents of 0.70-mole iron (Fe³⁺) is 2.1 eq.
What is the number of equivalents?The number of equivalents is the property of the atom, molecule, or compound to transfer its ions or electrons in a chemical reaction. The equivalents can be said to be the moles of the ions with a valency of one to neutralize the oppositely charged species.
The number of equivalents is calculated as,
Number of equivalents = number of moles × valence
Given,
Valency of iron (Fe³⁺) = +3
Number of moles of iron = 0.70 moles
Substituting values above to calculate equivalents as
Number of equivalents = 0.7 × 3
Number of equivalents = 2.1 eq
Therefore, there are 2.1 equivalents in 0.70 moles of iron.
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HELPPPPPPPPP 35 POINTSSSSSS!!!!!FILL IN THE BLANKS with either "reduce" or "oxidize"
Magnesium is able to ——copper, and copper is able to —— magnesium.
Zinc is able to—— magnesium, and magnesium is able to—— zinc.
Copper is able to—— zinc, and zinc is able to—— copper.
Look at my screenshot:
why is more dew formed on a grass and not on polished metal surface
Answer
Incidentally, they all form dew but because grass is closer to the soil, which maintains heat longer than the air where tree leaves are found, you will find more condensation in that region. Also, higher up the wind and sun will allow faster evaporation which makes the dew less noticable on tree leaves.
Explanation:
Preferred objects of dew formation are thus poor conducting or well isolated from the ground, and non-metallic, while shiny metal coated surfaces are poor infrared radiators. ... If the wet soil beneath is the major source of vapor, however (this type of dew formation is called distillation), wind always seems adverse.
1. What is a wave?
a.) a vibrating disturbance that transfers energy from place to place
b.) a material which a wave travels through
c.) an area where coils spread out
d.) the maximum distance a medium moves from its rest position
Answer:
A.
Explanation:
A wave is a disturbance that moves energy from one place to another. Only energy — not matter — is transferred as a wave moves. The substance that a wave moves through is called the medium. That medium moves back and forth repeatedly, returning to its original position. But the wave travels along the medium
A kind of sedimentary rock formed from plant material over a long period of time is __________.
a.
limestone
b.
cementation
c.
coal
d.
compaction
Please select the best answer from the choices provided
A
B
C
D
Answer:
Cementation
Explanation:
Sedimentary rocks are types of rock that are formed by the accumulation or deposition of mineral or organic particles at the Earth's surface, followed by cementation. Sedimentation is the collective name for processes that cause these particles to settle in place :)
Answer:
Coal
Explanation:
Coal is formed from plants trapped in dust and dirt for a long time, so coal would fit plant material, and it also takes a long time to make coal, that's why it will run out at some point
In which unit is the wavelength of an electromagnetic wave commonly measured?
A. J
B. nm
C. s-1
D. kg
Answer:
nm
Explanation:
trust me:)
A system gains 687 kJ of heat, resulting in a change in internal energy of the system equal to 156 kJ. How much work is done?
1. Work was done by the system.2. Work was done on the system.
Answer:
w = -531 kJ
1. Work was done by the system.
Explanation:
Step 1: Given data
Heat gained by the system (q): 687 kJ (By convention, when the system absorbs heat, q > 0).Change in the internal energy of the system (ΔU°): 156 kJStep 2: Calculate the work done (w)
We will use the following expression.
ΔU° = q + w
w = ΔU° - q
w = 156 kJ - 687 kJ
w = -531 kJ
By convention, when w < 0, work is done by the system on the surroundings.
What is the molecular structure of H2O?
Answer:
A water molecule consists of two hydrogen atoms and one oxygen atom. The three atoms make an angle; the H-O-H angle is approximately 104.5 degrees. The center of each hydrogen atom is approximately 0.0957 nm from the center of the oxygen atom.
Explanation:
Which reason best explains why metals are malleable?
A. because they have delocalized electrons
B. because they have localized electrons
C. because they have ionic bonds
D. because they have rigid bonds
The correct answer is A on edg 2020
How many moles are in a sample of 4.57 x 1024 atoms of neon (Ne)?
a.7.59 mol Ne
b.27.5 mol Ne
c.91.4 mol Ne
d.151 mol Ne
Answer:
A 7.59 mol Ne
Explanation:
The number of moles of Ne in a sample of 4.57 x 10²⁴ atoms of neon (Ne) are 7.59 mol of Ne. Hence Option (A) is the correct option. It can be solved with the help of Mole concept.
What is Mole concept ?The mole, symbol mol, is the SI base unit of amount of substance.
The quantity amount of substance is a measure of how many elementary entities of a given substance are in an object or sample.
n = given number / Avogadro's number
= 4.57 x 10²⁴ / 6.022 x 10²³
= 7.59 mol of Ne
Therefore, The number of moles of Ne in a sample of 4.57 x 10²⁴ atoms of neon (Ne) are 7.59 mol of Ne. Hence Option (A) is the correct option. It can be solved with the help of Mole concept.
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Renewable resources can be replenished in a short period of time. true or false
Answer:
they can be over a short period of time. so true
Explanation:
Which of the following best describes foliated metamorphic rocks?
A
There are easily recognizable fossils.
B
The rock has ribbon-like layers of bands.
C
They have crystals like igneous rocks.
D
Different sized sediments can be seen.
Answer:
It's C because Metamorphic rocks were once igneous rocks. And, because Gneiss which is a Metamorphic rock has crystals inside of it.
Different rock types appear during rock formation. The best description of foliated metamorphic rocks is that;
B . The rock has ribbon-like layers of bands.Due to the pressure and heat that is exerted on some rock types, there is an alignment or foliation of rocks. The appearance can be described as ribbon-like.
The examples of rocks that fall under this classification are slate, phyllite, gneiss, and schist.
The non-foliated rocks do not show any alignment in their minerals. Examples are; quartzite, marble, and novaculite.
Summarily, option B best describes a foliated metamorphic rock.
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look at the picture below of an astronaut at two different distance from a planet. in which position A and B would there be a stronger gravitational pull between the astronaut and the planet? Explain
please help please please please please please please please please help it's due right now at 8:20pm please please help please really need help please
Answer:
B
Explanation:
Gravitational pull is stronger when the person is closer to the planet.
The gravitational force is the fundamental force of the universe. Here the astronaut at position B will experience a stronger gravitational pull as compared to the astronaut at position A.
What is gravitational force?The gravitational force is defined as the force of attraction between any two bodies is directly proportional to the product of their masses and is inversely proportional to the square of the distance among them.
F = G m₁m₂ / r²
The gravitational force decreases with the increase in the distance. So here distance of astronaut at position B which is closer to the planet experience greater gravitational pull.
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What is the electron configuration of chlorine (CI)?
A. 1s22s22p63s23p3
B. 1s22s22p63s23p5
C. 1s22s22p63s24s23p3
D. 1s22s22p63s23p23d3
The correct answer is B on edg 2020
Answer: it is b
Explanation:
A _____________reaction mechanism involves loss of a leaving group, formation of a ________ followed by the removal of a proton (H ) from the adjacent Carbon.
A. electrophile
B. carbocation
C. E1
D. E2
E. nucleophile
Answer:
The correct answer is Option C (E1) and Option B (carbocation).
Explanation:
Intramolecular immunity idols are considered as that of the formation mechanism with E1 responses or reactivity. Reactants with E1 were indeed obligations of both parties, meaning that an E1 reaction was conducted thru all the two stages known as ionization but rather deprotonation. Involves the absence of either an aromatic ring, a carbocation has been generated throughout the ionization solution.Some other possibilities offered aren't relevant to the procedure outlined. So the above alternative is accurate.
What can you conclude from the figure shown?
(a) The Hund's rule has been violated
(b) The Aufbau principle has been violated
(c) The Pauli's Exclusion principle has been violated
(D) This is a valid orbital diagram
Answer:
A. Hund's rule has been violated
Explanation:
There must be one electron with the same spin in each orbital of the same energy before you can put two in the same orbital. In the photo, the 2s sublevel is completely filled before the 1s sublevel (if anything the 1s should have an up spin and down spin, with the 2s having one up spin).
From the figure , it can be concluded that Hund's rule is violated as 1s sub shell is not completely filled before moving to the 2s sub shell.
What is Hund's rule ?Hund's rule of maximum multiplicity is an atomic rule which is based on the observation of atomic spectra and is used for prediction of ground state of an atom or molecule which have one or more open electronic shells.
It states that, for a given electronic configuration lowest energy term is the one which has greatest value of multiplicities of spin. It implies to the fact that if two orbitals are present which are of equal energy, electrons will occupy them singly before pairing of electrons take place.
The rule finds tremendous use in atomic chemistry,spectroscopy and quantum chemistry.
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What is an nucleus ?
Nucleus is present at the centre of atom. It contains protons and neutrons. It is very small as compared to the atom.
Answer:
It is a part of a cell which controls all the activities in the cells and contains the genetic information of the cell that is to be passed down to the next cell when it reproduces.
Explanation:
It is a part of a cell which controls all the activities in the cells and contains the genetic information of the cell that is to be passed down to the next cell when it reproduces.
how many elements are found in the third period. A.2 B.18 C.8 D.32
Answer:
8
Explanation:
u can find it on ur chemistry book
Answer:
C. 8
Explanation:
Check chemistry textbook
To everyone who has exams today, I WISH YALL THE BEST OF LUCK!!!!
ありがとう私は本当にこの励ましが必要でした :)
The volume of a gas with an initial pressure of 380 mmHg atm increases from 5.0 L to 8.0 L. What is the final pressure of the gas, in atm, assuming no change in moles or temperature?
A) 238 atm
B) 2.4 atm
C) 0.31 atm
D) 0.80 atm
E) 8.0 atm
Answer:
0.31 atmExplanation:
The new pressure can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we are finding the new pressure
[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]
From the question
760 mmHg = 1 atm
380 mmHg = 0.5 atm
We have
[tex]P_2 = \frac{0.5 \times 5}{8} \\ = 0.3125[/tex]
We have the final answer as
0.31 atmHope this helps you
Which of the following bonds would be the most polar without being considered ionic? a. Mg-o b. C-O C. N-O d. Si-O
Answer:
the answer is c hope this helps
Explanation:
N-O is the most polar without being considered ionic. Hence, option C is correct.
What is an ionic bond?An ionic bond is formed by the complete transfer of some electrons from one atom to another.
Bonds between carbon and other elements such as oxygen or nitrogen are polar. The polarity of a bond depends upon the electronegativities of the bonded atoms.
Hence, option C is correct.
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Which energy source releases the most carbon dioxide?
O solar
O wind
O nuclear
O coal
Answer:
Coal
Explanation:
Coal is by far the worst emitter, followed by natural gas, with solar, wind and nuclear all low-carbon.
Coal, a non-renewable energy source releases the most carbon dioxide into the atmosphere.
What are energy sources?Energy sources refers to the various sources in which energy for man's needs are obtained.
There are two types of energy sources:
Renewable energy sourcesNon-renewable energy sourcesThe non-renewable energy sources such as coal release large amounts of carbon dioxide until The atmosphere.
Therefore, Coal, a non-renewable energy source releases the most carbon dioxide into the atmosphere.
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Reacting 10.0 mL of H2(g) with 10.0 mL of C2H4(g) produces 10.0 mL of C2H6 at 1.5 atm. If the reaction produces 3.1 kJ of heat and the decrease in volume requires the heat surroundings do 7.6 J of work on the gases, what is the change in internal energy of the gases?
Answer:
the change in internal energy of the gases is -3.0924 KJ
Explanation:
The computation of the change in internal energy of the gases is as follows;
Given that
Q = -3.1 KJ
= -3100 J
It is negative as the heat is lost from the mixture
And,
W = + 7.6 J
It is positive as the work is done in the mixture
Now we use the following equation
Delat E = Q + W
= -3100 J + 7.6 J
= -3092.4 J
= -3.0924 KJ
Hence, the change in internal energy of the gases is -3.0924 KJ
How many significant figures
are in this number?
21.00
Answer:
4
Explanation:
the significant figures are 2 1 0 0
How many atoms are in 8.2 moles of magnesium
Answer:
4.93804*10^24 atoms
Explanation:
Hope this helped!
how many moles of atoms of each element in one mole (NH4)2CO3
Answer:
Chemists generally use the mole as the unit for the number of atoms or molecules of a material. One mole (abbreviated mol) is equal to 6.022×1023 molecular entities (Avogadro's number), and each element has a different molar mass depending on the weight of 6.022×1023 of its atoms (1 mole).\
Have a great day!!!!
Explanation:
1 mole of (NH₄)₂CO₃ has:
2 moles of N atoms.8 moles of H atoms1 mole of C atoms.3 moles of O atoms.Let's consider the chemical formula of ammonium carbonate: (NH₄)₂CO₃.
The subscripts inform us of the number of moles of atoms in 1 mole of molecules.
Nitrogen has 2 subscripts: "1" (which is not written) and "2" (outside the parenthesis). The global subscript for nitrogen is obtained by multiplying both subscripts.
[tex]N: 1 \times 2 = 2[/tex]
Hydrogen has 2 subscripts: "4" and "2" (outside the parenthesis). The global subscript for nitrogen is obtained by multiplying both subscripts.
[tex]H: 4 \times 2 = 8[/tex]
The subscript for carbon is "1".
The subscript for oxygen is "3".
1 mole of (NH₄)₂CO₃ has:
2 moles of N atoms.8 moles of H atoms1 mole of C atoms.3 moles of O atoms.Learn more: https://brainly.com/question/375587
PLEASE HELP!!
Which of the following correctly shows the net ionic equation for the reaction between iron (iii) sulfate and potassium hydroxide?
DUE IN 3 MINS!
The net ionic equation for the reaction between iron (iii) sulfate and potassium hydroxide is
Fe³⁺(aq) + 3OH¯(aq) —> Fe(OH)₃(s) (Option B)
What is a chemical equation?Chemical equations are representations of chemical reactions using symbols and formula of the reactants and products.
The reactants are located on the left side while the products are located on the right side.
Reactants —> Products
The balancing of chemical equations follows the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.
How to write the net ionic equationIn solution
Fe₂(SO₄)₃ (aq) --> 2Fe³⁺(aq) + 3SO₄²⁻(aq)
KOH (aq) --> K⁺(aq) + OH¯(aq)
The reaction proceeds as follow
Fe₂(SO₄)₃ (aq) + KOH (aq) —>
Fe³⁺(aq) + SO₄²⁻(aq) + K⁺(aq) + OH¯(aq) —> Fe(OH)₃(s) + SO₄²⁻(aq) + K⁺(aq)
Cancel out the spectator ions (i.e SO₄²⁻ + K⁺) and balance to obtain the net ionic equation
Fe³⁺(aq) + 3OH¯(aq) —> Fe(OH)₃(s)
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In your opinion, would there be a difference in your wieght in Baguio and in Manila ?
Why or Why not
Answer:
My wife and I just visited the City of Baguio for a week. We stayed at the Hotel Supreme Convention, which was very nice. We ate dinner at some really nice places: Mario's (expensive), Don Henrico's (mid), and Good Taste (cheap). We found a nice bar called the Old Bohemian for good live music. We ventured out toward Camp John Hay a couple of times for shopping(the commissary is a tourist trap with retail prices). We also did some street shopping.
Explanation:
My wife and I just visited the City of Baguio for a week. We stayed at the Hotel Supreme Convention, which was very nice. We ate dinner at some really nice places: Mario's (expensive), Don Henrico's (mid), and Good Taste (cheap). We found a nice bar called the Old Bohemian for good live music. We ventured out toward Camp John Hay a couple of times for shopping(the commissary is a tourist trap with retail prices). We also did some street shopping.
Answer:
Why would there be a difference in weight if you live in a different place?Explanation:
[tex]--------------------------------------------[/tex]
If you lived in Manila or Baguio, how would your weight change? It would probably depend on what they are eating, how long they exercise, but not living in a different place, right? This is mind - boggling and i don't know what you mean or if you're asking a different question.
[tex]--------------------------------------------[/tex]
Hope this helps! <3
[tex]--------------------------------------------[/tex]