The correct chemical formula for nitrogen gas is N2. For example, "Nitrogen gas is one of the diatomic elements, in which one molecule consists of two atoms of the same element bonded by one or more covalent bonds."
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.
How many protons does an atom with an atomic number of 12 and a mass number of 26 have?
Answer:
12 cuz the atomic number is 12
Explanation:
Cellular respiration uses sugar and _________ to produce carbon dioxide and water
In the Ames Test, the appearance of his revertants in the presence of a non-mutagenic control compound indicates that _______.
Answer & Explanation: The Ames test examines the mutagenic effects of chemicals ; as such, it detects whether a given chemical can cause a reversion mutation in his- bacteria. While this is the purpose of the test, some of the reversion mutations are not caused by the mutagen being tested for. The appearance of his revertants in the presence of a non-mutagenic control compound therefore indicates that His+ revertants on the control plate are the result of spontaneous mutation.
Which of the following is not a property of nonmetals?
excellent electrical conductor
semiconductor
found on the right side of the periodic table
solids tend to be dull and brittle
Answer:
Excellent Electrical Conductors.
Explanation:
(Though I believe some of these answers could be worded better), Most non-metals are terrible conductors of electricity and heat. Nonmetals in solid forms lack luster and can be brittle, and there are semiconductors compared to Metals.
Answer:
Excellent Electrical Conductor, I believe.
Explanation:
Most metals are good electric conductors...
Id wait until somebody else answers to verify my answer.
Which of the following particle diagrams represents a mixture?
Answer:
I know Z
Explanation:
because here is mixing two substance so there is mixture
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.
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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PLEASEEEE ANSWERR 15 POUNTS
Answer:
c
Explanation:
Answer:
240
Explanation:
15 POUNTS 240
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 :)
Given the balanced equation representing a reaction:
Zn(s) + 2HCl(aq) - H2(g) + ZnCl2(aq)
Which set of reaction conditions produces H2(g) at the fastest rate?
A.
a 1.0-g lump of Zn(s) in 50. mL of 0.5 M HCl(aq) at 20.°C
B.
a 1.0-g lump of Zn(s) in 50. mL of 0.5 M HCl(aq) at 30.°C
C.
1.0 g of powdered Zn(s) in 50. mL of 1.0 M HCl(aq) at 20. °C
D
1.0 g of powdered Zn(s) in 50. mL of 1.0 M HCl(aq) at 30.°C
Answer:
D 1.0 g of powdered Zn(s) in 50. mL of 1.0 M HCl(aq) at 30.°C
Explanation:
There are several factors affecting and controlling the rate of chemical reactions.
Some of which are applicable in resolving this problem is the nature of the reactants and their concentration. Also, the temperature of the reaction is also very important.
Reactants that powdered ensures a faster rate because, more surface area is exposed for the reaction. Also, the higher the temperature, the faster the reaction will take place. So, the powdered zinc and the higher temperature reaction will facilitate a better rate of reaction.Trimethylamine, (CH3)3N is a weak base (Kb = 6.3 × 10–5). What volume of this gas, measured at STP, must be dissolved in 2.5 Lof solution to give that solution a pOH of 2.50?
Answer:
8.9L is the volume of the gas that must be dissolved.
Explanation:
For a weak base, we can find [(CH₃)₃N] using the equation:
Kb = [OH⁻] [[(CH₃)₃NH⁺] / [(CH₃)₃N]
As [OH⁻] = [[(CH₃)₃NH⁺] and [OH⁻] = 10^-pOH = 3.16x10⁻³M:
6.3x10⁻⁵ = [3.16x10⁻³M][3.16x10⁻³M] / [(CH₃)₃N]
[(CH₃)₃N] = 0.1587M
As the volume is 2.5L, moles are:
2.5L * (0.1587mol / L) = 0.3968moles
Using:
PV = nRT
We can solve for volume of the gas as follows:
P = 1atm at STP; n = 0.3968moles; R = 0.082atmL/molK; T = 273.15K at STP
V = 0.3968mol*0.082atmL/molK*273.15K/1atm
V = 8.9L is the volume of the gas that must be dissolved.
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:
How many moles are in 25.5g of helium?
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.
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 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:
The Fahrenheit scale is most commonly used _____.
A.inside European countries
B.inside the United States
C.in studies of other planets
Answer:
B The United States
Explanation:
most other countries use the C to measure their temperature
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.
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.
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 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:
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.
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
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
A material that reduces the rate of heat transfer is called
Write the isotope notation for an element with 53 protons and 20 neutron?
The isotope notation : ⁷³₅₃X
Further explanationGiven
53 protons and 20 neutron
Required
The isotope notation
Solution
Isotopes are elements that have the same atomic number with a different mass number
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 mass number of element = 53 + 20 = 73
Atomic number = 53
The symbol :
[tex]\large {{{73} \atop {53}} \right X}[/tex]
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
•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
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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