Answer:
b
Explanation:
becuase of sound waves
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Answer:
This shoes the soda lime defusing to limewater turning into germinating seeding which defuses back to limewater
Explanation:
How did John Newlands order the elements?
Hello friend! Hopefully this helps you as much as needed!
An English scientist called John Newlands put forward his Law of Octaves in 1864. He arranged all the elements known at the time into a table in order of relative atomic mass. He then put the similar elements into vertical columns, known as groups.
What is the mass in grams of each of the following?
a. 2.50 mol of sulfur, S
b. 1.80 mol of calcium, Ca
c. 0.50 mol of carbon, C
d. 3.20 mol of copper, Cu
a) 80
b) 36
c)6
d)64
All in grams
the formula ; n= m
M
was used .
where n is moles
m is mass of a substance
M is molar mass
The mass of the substance is the product of the moles and the molar mass. The mass of sulfur = 80 gm, calcium = 72 gm, carbon = 6 gm, and copper = 201.6 gm.
What is mass?Mass of any substance is the amount of the constituent particle it holds together and can be measured in grams. The mass has been calculated from the moles of the substance and its molar mass.
The mass of sulfur is calculated as,
Mass = moles × molar mass
= 2.50 mol × 32 g/mol
= 80 gms
The mass of calcium is calculated as,
Mass = moles × molar mass
= 1.80 mol × 40 g/mol
= 72 gms
The mass of carbon is calculated as,
Mass = moles × molar mass
= 0.50 mol × 12 g/mol
= 6 gms
The mass of copper is calculated as,
Mass = moles × molar mass
= 3.20 mol × 63 g/mol
= 201.6 gms
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Which statement best explains why the air pressure is greater at the poles than at the equator
Answer:
At the equator, the altitude is lower, and also because of the direct heating of sun rays on the surface, the temperature is much higher than at the poles. This makes the air near the surface hot and lighter and hence it rises up which results in lower air pressure.
Explanation:
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How r fossil fuel helpful
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Answer: The United States gets 81% of its total energy from oil, coal, and natural gas, all of which are fossil fuels. We depend on those fuels to heat our homes, run our vehicles, power industry and manufacturing, and provide us with electricity.
Explanation:
....
Answer:
They give us things that we couldnt get anywhere else and arent harmful to the enviornment
Explanation:
Which takes longer to bake, chocolate chip cookies or oatmeal cookies? What
are the independent variables? *
Explanation: oatmeal cookies, and the independednt variable is the kind of cookie
What is the wavelength of a radio wave with a frequency of 1.2 × 106 Hz? 3.6 × 1014 meters 3.6 × 102 meters 2.5 × 102 meters
Answer:
2.5 × 102 meters
Explanation:
Wavelength, which is denoted by λ, can be calculated using the formula:
λ = v/f
Where λ = wavelength (m)
v = speed of light (3×10^8m/s)
f = frequency (Hz)
According to the given information I n the question, f = 1.2 × 10^6 Hz, v = 3×10^8m/s
Hence;
λ = v/f
λ = 3 × 10^8 ÷ 1.2 × 106
λ = 3/1.2 × 10^ (8-6)
λ = 2.5 × 10^2
Therefore, the wavelength of the radio wave is 2.5 × 10^2 meters
What do we call the molecule that forms when two atoms of the same element are covalently bonded to each other?
Answer:
Covalent Compounds and Diatomic Elements
Explanation: The two atoms that are held together by a covalent bond may be atoms of the same element or different elements. When atoms of different elements form covalent bonds, a new substance, called a covalent compound, results. Water is an example of a covalent compound.
The valency of sodium metal
Answer:
The atomic number of sodium is 11 (Z=11). The electronic configuration of sodium can be written as 2, 8, 1. Therefore, valence electron in sodium is 1 and it needs to lose 1 electron from the outermost orbit to attain octet. Hence, the valency of sodium is 1.
Explanation:
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Which is one factor that scientists use to classify orders of soil?
A. fertility
B. climate
C.dryness
D.bedrock
Answer: Its B/Climate
Im pretty sure if its wrong srry!
Hope this helped!
Explanation:
Apart from different ways to classify soils. The one factor that scientists use to classify orders of soil is climate. Hence, Option (B) is correct
What is Climate ?Climate is the long-term pattern of weather in a particular area.
Weather can change from hour-to-hour, day-to-day, month-to-month or even year-to-year.
A region's weather patterns, usually tracked for at least 30 years, are considered its climate.
Other factors people uses in classifying orders of soil are;
ClimatePlant typeSoil compositionSoil orders are known as the single dominant attributes affecting soils in any location.
They can be the prevalent vegetation such as Alfisols and Mollisols or the type of parent material such as Andisols and Vertisols or the climate variables such as lack of precipitation etc.
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POSSIE Gallium (Ga) is a soft, silvery metal used primarily in electronic circuits, semiconductors, and light-emitting diodes (LEDs). It is also useful in high-temperature thermometers, barometers, pharmaceuticals, and nuclear medicine tests. Which electron configuration represents the electrons in an atom of gallium at ground state? O1s 2s22p63s23p64524d104p? O 182 2s22p63s23p64s24p1 o 1s 2s22p63s23p64823d104p? O 182 2s22p63s23p64s3
The ground state configuration : 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p¹
Further explanationElectrons can move the shell up or down by releasing energy or absorbing energy
It can be concluded that there are 2 conditions:
Ground-state is the state of electrons filling the shell with the lowest energy levels.
Excited-state is the state of electrons which occupies a higher energy level
The state of excited electrons can be seen from the presence of electrons which do not fill the shell completely but fill the shell afterward
Gallium (Ga) is a metal located in group 13, p-block and period 4
Atomic number : 31
If we look at the options:
options 1,2 and 3 do not conform to Aufbau principle(Electrons occupy orbitals of the lowest energy level ), because 3d orbitals do not exist and the number of electrons is also not 31
So that the most appropriate electron configuration is:
1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p¹ = 31 electrons
or we can write : [Ar] 4s² 3d¹⁰ 4p¹
Identify the reactants and products, and describe the change in energy that occurs as bonds are broken and formed.
Answer:
Chemical reactions almost always have a change in energy between products and reactants. The total energy of a system must remain the same and sometimes a chemical reaction will absorb or release energy as light, heat or both. The energy change in a chemical reaction is caused by the amount of stored energy between the products and the reactants.
Explanation:
2. Ultraviolet radiation has a frequency of 6.8 x 10'5Hz. Calculate the energy, in
joules, of the photon.
Answer:
[tex]E=4.5\times 10^{-18}\ J[/tex]
Explanation:
It is given that, the frequency of Ultraviolet radiation is [tex]6.8\times 10^{15}\ Hz[/tex]
We need to find the energy of the photon. The formula for the energy of a photon is given by :
[tex]E=hf\\\\\text{Where h is Planck's constant}\\\\E=6.63\times 10^{-34}\times 6.8\times 10^{15}\\\\E=4.5\times 10^{-18}\ J[/tex]
So, the energy of the photon is [tex]4.5\times 10^{-18}\ J[/tex].
Find an element that has the same
number of valence electrons as
Thallium (T1).
i need the answer nowww
Answer:sodium
Explanation: because its not hard to look on the PERIODIC TABLE
if atoms are made up of mostly space, why do objects feel like they are mostly solid
Answer:
dont question the world kid
Explanation:
where is lithium used in the body?
Answer:
u
Explanation:
Which is the IUPAC name for NO?
nitric oxide
binitrogen oxide
dinitrogen dioxide
nitrogen monoxide
The IUPAC name for NO is nitric oxide. The correct option is A.
What is IUPAC naming?The International Union of Pure and Applied Chemistry (IUPAC) is a global organization that represents chemistry as well as related sciences and technologies.
The chemical compound's identity is represented by its common and IUPAC names, which differ from one another. Every chemical compound has multiple names.
Complete the following step-by-step response: The IUPAC nomenclature is a standardized name given to organic compounds in accordance with official naming rules.
Nitric oxide, also known as NO, is a colorless gas. It is one of the most important nitrogen oxides.
Nitric oxide is a free radical, which means it has an unpaired electron, which is sometimes represented in its chemical formula by a dot.
Thus, the correct option is A.
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Answer:
D: Nitrogen Monoxide
Explanation:
There's one Nitrogen atom and one Oxygen atom
23. For the reaction shown, calculate how many moles of each
product form when the given amount of each reactant com-
pletely reacts. Assume there is more than enough of the
other reactant.
2PbS(s) + 302(g) → 2PbO(s) + 2S02(8)
(a) 2.4 mol PbS
(b) 2.4 mol O2
(c) 5.3 mol PbS
(d) 5.3 mol O2
The reaction equation is the chemical formula of reagents and product substances
A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products
Mol ratio :
Pbs : O₂ : PbO : SO₂ = 2 : 3 : 2 : 2
(a) 2.4 mol PbSmol PbO
[tex]\tt \dfrac{2}{2}\times 2.4=2.4[/tex]
mol SO₂
[tex]\tt \dfrac{2}{2}\times 2.4=2.4[/tex]
(b) 2.4 mol O₂mol PbO
[tex]\tt \dfrac{2}{3}\times 2.4=1.6[/tex]
mol SO₂
[tex]\tt \dfrac{2}{3}\times 2.4=1.6[/tex]
(c) 5.3 mol PbS
mol PbO
[tex]\tt \dfrac{2}{2}\times 5.3=5.3[/tex]
mol SO₂
[tex]\tt \dfrac{2}{2}\times 5.3=5.3[/tex]
d) 5.3 mol O₂mol PbO
[tex]\tt \dfrac{2}{3}\times 5.3=3.53[/tex]
mol SO₂
[tex]\tt \dfrac{2}{3}\times 5.3=3.53[/tex]
A does not change the substance into anything new
Answer:
Physical changes only change the appearance of a substance, not
chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.
Explanation:
Destructive forces can include floods, landslides, tornadoes, tsunamis, wildfires and
volcanoes.
True
False
Answer:
answer is true
Answer:
True
Explanation:
You have an empty milk container, and you close the cap on the container. Do the particles of air that you trapped inside the container have mass? Explain how you know.
Answer:
Yes the air particles have mass
Explanation:
Air is mater: it has weight and occupies space. For it to have weight, it has to have a mass. The mass would however be determined by how much volume of air is trapped in the container, but nevertheless, the mass of the air can be obtained.
We also notice that if the container is "popped", the mass of air escapes through one way by the weight exerted on it.
I hope this was helpful.
Answer:
Yes the air particles have mass
Explanation:
You can tell that if the container is pooped open the mass of air escapes
Which force is equal but opposite to the one shown?
O A. Air resistance applying a normal force on the horse
O B. The ground applying a force on the horse
C. Gravity applying a downward force on the horse
D. The horse applying an action force on the ground
PREVIOUS
Answer:
b
Explanation:
Predict how James will improve the view of the sample. How will the magnification and resolution of the image change?
Answer:
answer questions brain
Which change would increase the pressure exerted by a gas?
removing gas molecules from the container
transferring the gas to a larger container
raising the temperature of the gas
reducing the force of the molecules hitting the container
Answer:
C - raising the temperature of a gas
Explanation:
as you raise temperature, kinetic energy rises, and so does pressure
Answer:
C.
raising the temperature of the gas
Explanation:
Edg. 2020
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What most accurately illustrates the electrostatic forces between protons and electrons?
How many meters is a 50 yards olympic size swimming pool?
Answer:
An official Olympic Sized pool is 50 meters long by 25 meters wide.
Explanation:
with of the following describe a chemical change
a) a metal fork was melted
b) a metal fork was cut in half
c) a metal fork became bent
d) a metal fork became rusted
Answer:
D
Explanation:
Rusting is a chemical change that occurs due to oxygen.
Answer:
d i had this your welcome
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Refer to the Newsela article "How You Can Make a Solar Oven To Cook with a Pizza Box."
What is the author's purpose in mentioning variables in designing the solar oven?
to show how easy it is to produce solar energy
to encourage readers to vary the design
to explain how wasteful solar energy production can be
to show the author did not think too hard about the design
Answer:
To encourage readers to vary the design
Explanation:
You are stranded in Capitola Village without a ride home or a Jump bike.
You decide to walk home which is a distance of 32 blocks. How many
minutes will the trip take if you can walk one mile in 20 minutes? Assume
that 9 blocks in SC equals one mile. Show all of your handwritten work and
unit cancelations and upload a picture of your work.
Answer:
The answer is 3and 5/9 multiplied by 20 which is about one hour and 14 ,inutes
Explanation:
Convert each of the following masses to the units requested.
a. 0.765g to kilograms
b. 1.34 g to milligrams
c. 34.2mg to grams
Answer:
a) 0.000765kg
b) 1340mg
c) 0.0342g
Explanation:
a) 1000g = 1kg
0.765g= 0.765/ 1000
= 0.000765g
b) 1g = 1000mg
1.34g = 1.34 × 1000
= 1340mg
c) 1000mg = 1g
34.2mg = 34.2/1000
= 0.0342g