Answer:
10 moles of methane
Explanation:
1 mole of methane contains 6.02 × 10^23 molecules (Avogadro's number)
x moles should contain 7.02 x 1024 molecules of
methane
So,
x= 7.02 x 1024 × 1/6.02 × 10^23
x= 10 moles of methane
Tightly packed molecules that vibrate in place describe a
O solid
O liquid
gas
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Which of the following statements is NOT part of the cell theory? *
A) All cells are produced from other cells.
B) Cells can absorb food and oxygen
C) All living things are composed of cells.
D) Cells are the basic units of structure and function in living things.
Answer:
B B B B B B B B B B B B B B B B B B B B B B B B
b is not cell theory
which isotope of hydrogen is unstable
Answer:
Hydrogen has three naturally occurring isotopes: 1H (protium), 2H (deuterium), and 3H (tritium). Other highly unstable nuclei (4H to 7H) have been synthesized in the laboratory, but do not occur in nature. The most stable radioisotope of hydrogen is tritium, with a half-life of 12.32 years.
Explanation:
i really hope i helped ya out! good luck!
The photo shows an animal embryo.
Which two activities happen as the embryo grows?
O A. The cells decrease in number.
B. The cells form new organisms.
C. The cells rearrange molecules.
DD. The cells divide.
The two activities that happen as the embryo grows are: D. The cells divide and B. The cells form new organisms. The correct answer is option B and D, respectively.
Cell division is the process by which a single cell divides into two or more daughter cells. It is a fundamental process in all living organisms and is essential for growth, development, and repair of tissues. There are two main types of cell division: mitosis and meiosis.
As the embryo grows, its cells divide and multiply, which leads to an increase in the number of cells. This process is called cell division and is necessary for the growth and development of the embryo.
In addition to cell division, the cells in the embryo also differentiate and specialize to form the various tissues and organs of the body. This process is called morphogenesis and is essential for the formation of a functional organism.
Therefore, the correct options are B. The cells form new organisms and D. The cells divide, respectively.
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The radius of a vanadium atom is 130 pm. How many vanadium atoms would have to be laid side by side to span a distance of 1.30 mm
Answer:
5 000 000 (5 million atoms)
Explanation:
Let us assume that a vanadium atom has a spherical shape.
diameter of a sphere = 2 x radius of the sphere
Thus,
Radius of a vanadium atom = 130 pm
= 130 x [tex]10^{-12}[/tex] m
The diameter of a vanadium atom = 2 x radius
= 2 x 130 x [tex]10^{-12}[/tex]
= 260 x [tex]10^{-12}[/tex] m
Given a distance of 1.30 mm = 1.30 x [tex]10^{-3}[/tex] m,
The number of vanadium atoms required to span the distance = [tex]\frac{1.3*10^{-3} }{260*10^{-12} }[/tex]
= 5000000
Therefore, the number of vanadium atom that would span a distance of 1.30 mm is 5 million.
How do you determine if a polyatomic ion needs to be counted together?
Answer:
Calculate from Oxidation Number
The oxidation number of oxygen is -2, and the oxidation number of hydrogen is +1. Add together the oxidation numbers of all the atoms in the polyatomic ion. In the example, -2 +1 = -1. This is the charge on the polyatomic ion.
what is meant by the following terms:
1.rearing.
2.shearing.
3.sericulture
The Meaning :-
1. Rearing Is The Process Of Keeping, Feeding, Breeding, And Medical Care Of Useful Animals.
2. Shearing Is The Process Of Removing The Fleece Of Sheep, Along With A Layer Of Skin By A Large Razor, Clipper Or A Shearing Machine.
3. Sericulture Is The Rearing Of Silkworms On A Commercial Scale.
the difference between these two chemical formulas: 4 H2O and H8O4.
Answer:
Explanation:
The given chemical formula is;
4H₂O H₈O₄
H₂O signifies 2 atoms of hydrogen bonding with 1 atom of oxygen
H₈O₄ signifies 8 atoms of hydrogen bonding with 4 atoms of oxygen
The 4 coefficient before H₂O signifies the number of moles.
It appears H₂O is 4 moles of water
H₈O₄ is 1 mole of the compound
The number of moles of each of the compound differs.
The difference between the two chemical formulas has been on the basis of the number of the molecules present. There have been 4 molecules of [tex]\rm H_2O[/tex], while only 1 molecule of [tex]\rm H_8O_4[/tex].
The chemical formula has been used for the determination of the number of atoms of each element present in the compound.
The chemical formula 4 [tex]\rm H_2O[/tex] gives the idea that there have been 4 molecules of water, with each molecule has consisted of 2 hydrogens and 1 oxygen atom. The total number of atoms has been 8 hydrogen atoms and 4 oxygen atoms.
The chemical formula [tex]\rm H_8O_4[/tex] gives insight into the presence of 1 molecule having 8 atoms of hydrogen and 4 atoms of oxygen.
The similarity in the chemical formula has been the presence of the same number of atoms. The difference between the two chemical formulas has been on the basis of the number of the molecules present. There have been 4 molecules of [tex]\rm H_2O[/tex], while only 1 molecule of [tex]\rm H_8O_4[/tex].
For more information about the chemical formula, refer to the link:
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What is frequency? How can sound wave having different frequencies have the same speed
Answer:
The relationship of the speed of sound, its frequency, and wavelength is the same as for all waves: vw = fλ, where vw is the speed of sound, f is its frequency, and λ is its wavelength. ... The more rigid (or less compressible) the medium, the faster the speed of sound
Explanation:
Answer:
The speed of sound can change when sound travels from one medium to another. However, the frequency usually remains the same because it is like a driven oscillation and has the frequency of the original source. If vw changes and f remains the same, then the wavelength λ must change.
A graduated cylinder contains 17.5 mL of water. A metal cube is placed in the cylinder and the water level rose to 20.3 mL. The metal cube has a mass of 30 g. What is the density of the metal cube
Answer:
10.71 g/mL
Explanation:
Initial Volume = 17.5 mL
Final Volume = 20.3 mL
Volume of cube = Final Volume - Initial Volume = 20.3 mL - 17.5 mL = 2.8mL
Mass of cube = 30g
Density = Mass / Volume
Density = 30 / 2.8 = 10.71 g/mL
What pathway does the air that enters your body take?
a. nose, esophagus, larynx, bronchi, lungs
b. nose, pharynx, bronchi, larynx, trachea
c. nose, pharynx, lungs, trachea, larynx
d. nose, pharynx, larynx, trachea, bronchi, lungs
Answer:
D
Explanation:
The air that we breathe in enters the nose or mouth, flows through the throat (pharynx) and voice box (larynx), and enters the windpipe (trachea). The trachea divides into two hollow tubes called bronchi.
what does inductive effect mean?
Answer:
Tbh I looked it up but here is what I found. I hope it helps
Explanation:
In chemistry, the inductive effect is an effect regarding the transmission of unequal sharing of the bonding electron through a chain of atoms in a molecule, leading to a permanent dipole in a bond.
•What do you think salt water is useful for?
•What does it mean if someone says “the salinity of the water is high”?
•Why would someone want to remove salt from water?
• How can salt be removed from water?
Answer:
it is good for thermoelectric power plant cooling
it means that there is a lot of salt in the water
Someone would remove salt from water to be able to drink it
lastly, salt can be removed from water with reverse osmosis systems
whats the formula for soduim hydrogen carbonate
Answer:
NaHCO3
Explanation:
Answer:
NaHCO₃
(You can use regular searches to find formulas by the way, much faster)
What is the number of the group that has the most reactive nonmetals (give number and letter- Ex 1A, 2A, etc.)?
Answer:
Group 7A
Explanation:
The group 7A elements consists of the most reactive non-metals on the periodic table.
This group is known as the group of halogens. They consist of element fluorine, chlorine, bromine, iodine and astatine.
The elements in this group have the highest electronegativity values. They have 7 valence electrons and requires just one electron to complete their octets. This way, they are highly reactive in their search for that single electron.Is Na+H20 -> H2+ NaOH a single replacement, Double Replacement or A Decomposition reaction
Answer:
Single Replacement
Explanation:
Single Replacement reactions are A + BX = AX + B. It's easy to tell if somthing is a single replacement reaction by seeing if it is a lone element like Sodium or Calcium
What type of relationship is pollination of flowers?
Tell which type of relationship it is: mutualism, predation, parasitism, competition, or commensalism. Give details on why.
I think that animals pollinating flowers is an example of....
I know this because...
Answer: mutualism
Explanation: animals pollinating flowers is an example of a mutualistic relationship since both the flower and pollinator benefit from one an other. In the plant-pollinator relationship, Flowers provide the pollinator with nectar and pollen, which the pollinators then collect for feeding; and the pollinators provide flowers with the means to reproduce, by spreading pollen from flower to flower.
How many Molecules are in 20 grams of CO?
Answer:
2.74 x 1023 molecules of CO2.
Explanation:
There are 2.74 x 1023 molecules of CO2.
How many significant figures are in the following number?
3.40 X 10-6
Answer:
(2.68 x 10^22 atoms) x (238 g U / 6.022 x 10^23 atoms) = 10.59 g of U.
The number least significant figures in the multiplication and division problem is 3 significant figures (2.68). So, following significant figure rules for multiplication, your answer should have 3 significant figures.
The final answer is: 10.6 g U
Explanation:
Hopefully this helps :)
PLEASEEEE ANSWERR 15 POUNTS
Answer:
c
Explanation:
Answer:
240
Explanation:
15 POUNTS 240
Which of the following elements will form +4 ions?
а
Gallium
b Germanium
C Calcium
d Magnesium
Answer:
gallium and germanium
Explanation:
hope it will help you
The element that would form +4 ions is Germanium. The correct option is b Germanium
From the question,
We are to determine which of the given elements will form +4 ions.
Gallium belongs to group 13 and will form +3 ions because the its oxidation state is +3.
Germanium belongs to group 14 and it forms stable oxidation state of +2 and +4. Therefore, Germanium will form +4 ions.
Calcium belongs to group 2 on the periodic table. Its oxidation state is +2 and it forms +2 ions.
Magnesium also belongs to group 2 on the periodic table. Its oxidation state is +2 and it forms +2 ions.
Hence, the element that would form +4 ions is Germanium. The correct option is b Germanium
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How many neutrons are present in 21Ne?
The number of neutrons present : 11
Further explanationGiven
²¹Ne
Required
Number of neutrons
Solution
In the following element notation,
[tex]\large {{{A} \atop {Z}} \right X}[/tex]
X = symbol of element
A = mass number
= number of protons + number of neutrons
Z = atomic number
= number of protons = number of electrons, on neutral elements
So the symbol above shows the mass number Ne: 21
Ne itself has an atomic number of 10, so the number of neutrons :
number of neutrons = mass number - atomic number
number of neutrons = 21 - 10
number of neutrons = 11
A material that reduces the rate of heat transfer is called
A cart rolling down an incline for 5.0 seconds has an acceleration of 4.0 m/s2. If the cart has a beginning speed of 2.0 m/s, what is its final speed?
Answer:
22m/s
Explanation:
Given parameters:
Time = 5s
Acceleration = 4m/s²
Initial velocity = 2m/s
Unknown
Final speed = ?
Solution:
To solve this problem, we use the expression below;
v = u + at
v is the final speed
u is the initial speed
a is the acceleration
t is the time taken
So, insert the parameters and solve;
v = 2 + 4 x 5 = 22m/s
Cellular respiration uses sugar and _________ to produce carbon dioxide and water
How many moles are there in 8.46 x 1024 molecules of sodium fluoride?
Answer:
14.05moles
Explanation:
Given parameters:
Number of atoms of NaF = 8.46 x 10²⁴atoms
Unknown:
Number of moles = ?
Solution:
To solve this problem, we must understand that a mole of any substance contains the Avogadro's number of particles.
6.02 x 10²³ atoms makes up 1 mole of an atom
8.46 x 10²⁴ atoms will contain = [tex]\frac{8.46 x 10^{24} }{6.02 x 10^{23} }[/tex] = 14.05moles
Answer:
14.05 moles
Explanation:
Balance the following Chemical equation by providing the correct coefficients
Answer:
[2] Na + [2] H2O ➖ [2] NaOH + [ ] H2
Hope it will help :)
Answer:
2, 2, 2, and 1
Explanation:
I put that in and it was correct.
Which of the following particle diagrams represents a mixture?
Answer:
I know Z
Explanation:
because here is mixing two substance so there is mixture
Х
Which symbol can be used to indicate the pressure at which a chemical reaction is carried out?
Ο Α.
2500
O B.
N
0 0
2 atm
D
PL
Are babies producers or consumers or none? What about rocks? Are they producers or consumers?
Answer:
ummm according 2 me babies are consumers and rocks are also consumers