Answer:
When water forms beads on a surface, as it does on the hood of a freshly waxed car, we can say that the water is minimizing its contact with the surface because the cohesive forces are larger than the adhesive forces
Explanation:
A waxed car's surface is covered wax which is an hydrocarbon having long chains that are very hydrophobic and therefore there is little interaction between the surface covered in wax and the cohesive forces in the water is much larger than the adhesive forces between the water and the freshly waxed car's surface which makes the water bead up to minimize the contact surface with the car's metal surface that results in limiting of the rust.
What is the best statement about the data collected in Amir’s table?
A. Wave 3 resulted from destructive interference, and Wave 4 resulted from constructive interference.
B. Waves 3 and 4 resulted from constructive interference.
C. Waves 3 and 4 resulted from destructive interference.
D. Wave 3 resulted from constructive interference, and Wave 4 resulted from destructive interference.
Answer: The answer is D :)
Explanation:
Answer:
D
Explanation:
A material that reduces the rate of heat transfer is called
How many moles are in 25.5g of helium?
Can somebody plz help answer these true or false questions correctly thanks! (Only if u for sure know them) :)
WILL MARK BRAINLIEST WHOEVER ANSERS THEM FIRST !!!:DDD
Answer:
1. False
2. True
3. False
4. True
5. True
Explanation:
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.
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
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
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
•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
PLEASEEEE ANSWERR 15 POUNTS
Answer:
c
Explanation:
Answer:
240
Explanation:
15 POUNTS 240
Please help! I give brainliest, stars, and hearts!
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
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:
I'm giving the brainliest if it's correct thank you
An ammonia (NH3) sample occupies a volume of 6.00 L at TPN. Calculate its mass.
Answer:
Explanation:
Now, you know that this solution has a molarity of 6.00 M, which basically means that every liter, which is the equivalent of 1000 mL, will contain 6.00 moles of ammonia. Since we've picked a sample of 1000 mL, you can say that it will contain 6.00 moles of ammonia. To convert this to grams, use the compound's molar mass
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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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 :)
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
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.
QUICKKKKKK I WILL GIVE BRAINLIEST
When a small volume of water is boiled, a large volume of steam is produced. Why?
Water molecules repel each other when heated.
Water molecules repel each other when heated.
The size of the water molecules increases when heated.
The size of the water molecules increases when heated.
The molecules are further apart in steam than in water.
The molecules are further apart in steam than in water.
The change from water to steam causes the number of molecules to increase.
Answer:
C
Explanation:
The molecules are farther apart in steam than in water.
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
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
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
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.
What is true of a Lewis acid?
O A. A Lewis acid accepts electron pairs.
O B. A Lewis acid donates H+ ions.
O C. A Lewis acid accepts H+ ions.
O D. A Lewis acid donates electron pairs.
Answer:
a lewis acid accepts electron pairs
Explanation:
a p e x
The fact that is true about Lewis acid is that A Lewis acid donates electron pairs. Hence option D is correct.
What is a Lewis acid?In chemistry, a Lewis acid is a chemical species that can accept a pair of electrons from another species, known as a Lewis base. Lewis acids are electron pair acceptors.
They can be identified by their tendency to form a covalent bond with a Lewis base by accepting a pair of electrons. This definition of Lewis acids and bases, provided by Gilbert N. Lewis, helped to provide a more comprehensive understanding of chemical reactions beyond the traditional acid-base theory.
Common examples of Lewis acids include metal cations, such as aluminum and boron, and compounds such as carbonyl compounds and acids with a positive charge. Lewis acids play an important role in many chemical reactions, including organic synthesis, coordination chemistry, and acid-catalyzed reactions.
Therefore, option D, A Lewis acid donates electron pairs is correct.
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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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Cellular respiration uses sugar and _________ to produce carbon dioxide and water
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.
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.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.
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.