Largest to smallest ionic radius
As3- > Se2- > Br- > Rb+ > Sr2+ ( ionic radius)
ionic radius is the distance between nucleus of an ion and the point up to which the nucleus has influence on its cloud. measured in nm pm or angstromstrend for ionic radius is the moving down ionic radius increases. left to right, the ionic radius of cations anions and atoms forming ionic bonds decreaseselectron affinity is the specific measure of the energy released when an electron is added to an atom. along the period- increases left to right and along group- decreases down, as lectron affinity increases radius decreaseselectronegativity is quantitive measure of the electron attracting ability in a molecule , along a period- electronegativity increases across and along group - decreases down, as electronegativity inreases radius decreasesTo know more about ionic radius visit :
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A
Which of the following describes a compound? (Hint: Carbon and oxygen both appear on the periodic table.)
a substance that is made of two oxygen atoms for each carbon atom .
A compound is the substance that contains two or more atoms which chemically combined together in a fixed ratio by mass
.For example, CO₂ is a compound and its ratio by mass is 12:32 which is equal to 3:8. Whereas when a substance with atoms of only a single element is known as a pure substance.
So, we can conclude that the substance made of two oxygen atoms for each carbon atom describes a compound.
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The periodic table is arranged by various patterns is there a pattern with regard to ionic charge? In 3 to 5 sentences explain your reasoning and provides specific examples
In the periodic table, positive ions grow in magnitude from left to right, whereas negative ions grow in magnitude from right to left.
The periodic table shows that there are more valence electrons on the right than the left. The maximum amount of ionic charge that an element can hold fluctuates as the quantity of valence electrons rises.
Metals on the periodic table's left side mostly produce positively charged ions. These ions get stronger with time, increasing in size.
The negative charges on the ions that nonmetals on the right side of the periodic table produce, have a diminishing magnitude with time.
For example, when we move from atomic number10 to 11, because we are changing from a noble gas to a very reactive alkali metal, moving from such an element with a full octet to one with just the outermost electron, which readily relinquishes it in order to follow the octet rule, there is a very significant degree of change in reactivity.
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When Sally burns 1.0g of coal she makes 0.2g of ash. Explain her findings.
Answer:
after burning the coal,0.8of coal was lost to produce Ash and it remained little amount of coal
10. Calculate the wavelength of the light that an electron in a Hydrogen atom would emit if it moved from n=2 to n=1
The wavelength of the light is obtained as 122nm.
What is the wavelength?From the Bohr model of the atom, we know that an electron could absorb energy and move from a lower to a higher energy level. When this electron returns to its ground state, energy is emitted in the form of a photon of visible light.
Given that;
1/λ = RH (1/n1^2 - 1/n2^2)
λ = wavelength of the light
n1 = final level
n2 = initial level
1/λ = 1.097 * 10^7(1/1^2 - 1/2^2)
1/λ = 1.097 * 10^7(1 - 0.25)
λ = 1.22 * 10^-7 m or 122nm
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What reagents are required to synthesize alcohols?
Answer:
Top = H₂SO₄, H₂O or H₃O⁺
Middle = 1.) Hg(OAc)₂, H₂O
2.) NaBH₄
Bottom = 1.) BH₃ · THF
2.) H₂O₂, NaOH
Explanation:
In the top reaction, the alcohol is being added to the most substituted carbon in the entire molecule. The top reaction could use H₂SO₄, H₂O as the reagents or H₃O⁺ as the reagent.
In the middle reaction, the alcohol is being added to the most substituted carbon included in the double bond. Hg(OAc)₂ is the shorthand way of representing mercury (II) acetate.
In the the bottom reaction, the alcohol is being added to the least substituted carbon included in the double bond.
A student measure 9.24 mL of an unknown liquid in a graduated cylinder. The mass of the empty cylinder is 34.670 g, and the mass of the cylinder and liquid is 39.671 g. What is the density of the unknown liquid? (remember significant figures and units in your answer)
explain the state of the air particles inside a pumped tyre
Answer:
First look up the ideal gas law: PV=NRT, where P=pressure, V=volume, N=amount of gas in moles, R=universal gas constant, and T=Temperature in degrees K. See Ideal gas law - Wikipedia for details.
Then consider the following:
Inside a tire, V and R are constants, while P, N, and T vary.
What makes a tire seem hard or soft is the difference in pressure between the air in the tire and the air around the tire.
A so-called flat tire is not devoid of air; it just has the same pressure inside as outside.
When you pump up a tire, you are increasing N by forcing more air molecules into the tire. As V is a constant volume, you create a pressure difference between inside and outside.
This pressure difference varies with how much you pump the tire (P), as well as the temperature around the tire (T) and the air pressure around the tire (atmospheric or “ambient” pressure).
The fact that an inflated tire is in balance with ambient pressure — with the added influence of PV=NRT — has some counter-intuitive results. For example,
I’ve had bike tires blow out by being left in a hot car. Why? The pressure in the car is the same, but the pressure in the tire increases as T increases until it’s beyond the safe limit.
More rarely, I’ve heard reports of bike tires blowing out by being carried in the unpressurized hold of an airplane. In this case, the tire doesn’t get hot; instead, the pressure outside the tire decreases, until the tire can’t hold in the pressure. In actuality, this is really hard to do; the tire has to be over-pressurized to start with; the difference in ambient pressure is not enough to blow out a typical bike tire.
Octane (bpt 125.6 deg * C ) and 2,2,3,3-tetramethylbutane (bpt 106.3 deg * C ) exist as structural isomers. Explain why 2,2,3,3-tetramethylbutane is more volatile than octane
Octane is a hydrocarbon and an alkane with the chemical method C8H18, and the condensed structural system CH3CH26CH3. Octane has many structural isomers that fluctuate by using the quantity and vicinity of branching inside the carbon chain. any such isomers, 2,2,four-trimethylpentane usually called iso-octane is used as one among the standard values in the octane score scale.
Octane is colloquially used as a quick form of octane score specifically in the expression high octane. Octane score is an index of a gasoline's ability to withstand engine knock-in engines having exclusive compression ratios, which is a feature of octane's branched-chain isomers, especially iso-octane. The octane rating of gas is not directly related to the strength output of an engine. using gasoline of a better octane than an engine is designed for can't boom electricity output.
Nonane can have a better boiling factor than octane because it has an extended carbon chain than octane. Octane can have a higher boiling point than 2,2, three,three‑tetramethyl butane, because it branches much less than 2,2,3,3‑tetramethyl butane, and consequently has a larger floor vicinity and extra van der Waals forces. Nonane could have a better boiling factor than octane because it has an extended carbon chain than octane.
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What is an example of two organelles that both animal an plant cells share?
(A) nucleus and chloroplasts
(B) mitochondria and cell wall
(C) ribosomes and mitochondria
(D) cell wall and chloroplasts
how do you turn "why do people smoke" into a testable question?
An unknown metal sample with a mass of 14.8 g was obtained. The sample displaces 0.767 mL of water. The densities of several metals are listed in the table.
Metal Density (g/mL)
aluminum 2.70
iron 7.87
cobalt 8.90
copper 8.96
gold 19.3
What is the possible identity of this metal sample?
copper
gold
cobalt
aluminum
Possible identity of this metal sample is gold
Here given data is unknown metal mass=14.8 g sample displaces=0.767 mL of water we have to find density of given metal=?
Density=mass/volume
Here mass=14.8 g and volume=0.767
Density=mass/volume
Density=14.8g/0.767
= 19.29≈19.30 means 19.3
So in the listed metal above answer are matched with gold
Therefore gold has 19.3 density.
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What is the formula for Mg & O ionic bonds
Answer:
Oxygen gains two electrons to have an octet. The ionic bond between ions results from the electrostatic attraction of opposite charges. The final formula of magnesium oxide is MgO.
Explanation:
A biology class wanted to study the effect of different materials on the melting rate of ice. They placed pieces of ice, each with a mass of 10g, onto trays. Group 1 was covered in plastic, group 2 was covered in paper, group 3 was covered in aluminum, and group 4 remained uncovered.
Each piece of ice was allowed to melt for 15 minutes. Then final mass of the ice, minus the melted water, was recorded at the end of the experiment.
What is the independent variable in this experiment?
Choose 1 answer:
Choose 1 answer:
(Choice A)
A
The type of covering material
(Choice B)
B
The amount of melting time
(Choice C)
C
The starting mass of the ice
(Choice D)
D
The final mass of the ice
The Independent variable in the experiment is the type of covering material.
What is an experiment?An experiment is the only way by which we are able to decode cause and effect relationships. Since science is empirical, every tentative explanation if a phenomenon is subjected to controlled tests. These controlled tests are what we call an experiment. There must be an independent variable and there must be dependent variable. The independent variable is the variable that is manipulated in the experiment while the dependent variable is the variable that changes as we manipulate the independendent variable.
Now, if we look at the experiment, we can see that we are manipulating the type of covering in order to determine the impact that it has on the time that it taking for cooling to occur.
Hence the Independent variable in the experiment is the type of covering material. The type of the covering was being changed and then the impact of the change of the covering material on the cooling time is studied.
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You wanted to measure the volume of an irregularly shaped rock using water displacement to find the
volume. You started by measuring the mass of the rock before you put it in the water; the mass was 10.7
grams. You put 23.9 mL of water into the graduated cylinder and then added the rock. The volume of the
water and the rock together was 25.7 mL. Calculate the density of the rock
CLICK OR SCAN PLS HELP ME
Answer:
a pebbles density is 34 meters and has a volume of 2
C5H12 + O2 CO2 + H2O If the molar mass of pentane is 72 g/mol, how many kilograms of carbon dioxide will be created when 9.28 kilograms of pentane combust?
The mass of the CO2 28.4 Kg.
What is combustion?The term combustion refers to burning. When a material is combusted, the material is made to burn in oxygen. This in itself is an oxidation reaction. It is common that we have to burn the alkanes and some other kinds of hydrocarbons for the process of obtaining energy.
In this case, we can see that the substance that we have to burn is pentane. The reaction equation is written in the manner; C5H12+8O2→6H2O+5CO2.
Number of moles of pentane = 9.28 * 10^3 g/ 72 g/mol
= 128.9 moles
Now;
If 1 mole of pentane produces 5 mols of CO2
128.9 moles of pentane would produce 128.9 moles * 5 mols/ 1 mole
= 644.5 moles of CO2
Mass of CO2 produced = 644.5 moles of CO2 * 44 g/mol = 28.4 Kg
Hence, we have about 28.4 Kg of CO2 produced
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How many moles of KBr are present in 150 mL of a 0.122 M solution?
The number of moles of KBr present in 150 mL of a 0.122 M solution is 0.0183mol.
How to calculate number of moles?The number of moles in a solution can be calculated by multiplying the molarity of the solution by the volume as follows:
no of moles = molarity × volume
Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution. It is the most common way to express the concentration of a solution.
According to this question, there are 150 mL of a 0.122 M pottasium bromide (KBr) solution, the number of moles in this solution can be calculated as follows;
no of moles = 150mL/1000 × 0.122M
no of moles = 0.0183mol
Therefore, the number of moles of KBr present in 150 mL of a 0.122 M solution is 0.0183moles.
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Correct.
How many grams of iron are needed to combine with 25.7 g of O to make Fe₂O3?
The correct answer is 48.36 g .
A mole of any material is equal to 6.023 x 1023, or Avogadro's number. Additionally, it is employed to express concentrations in terms of moles per litre or molecular weight.
Number of moles of O = (Mass of O / Molar mass of O) = ( 25.7 g / 15.999 g/mol) = 1.6 mol
3 mol of O combine with 2 mol of Fe (iron) to form Fe2O3 . Or, 1 mol of O combines with (2/3) mol of Fe.
Therefore, 1.6 mol of O combine with = (2/3) × 1.3 = 0.866 mol of Fe
Mass of Fe (iron) = (Number of moles of Fe) × (Molar mass of Fe) = (0.866 mol) × (55.845 g/mol) = 48.36 g
Hence, the amount of iron required = 48.36 g
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What is the energy of a microwave photon that has a frequency of 1.12 × 10^12 Hz? (h= 6.63 × 10^-34 J*s)
Answer:
The energy of one photon is given by the expression, E=hν
where, h=6.626×10
−34
Js and ν=5×10
14
s
−1
E=6.626×10
−34
×5×10
14
=3.313×10
−19
J
Explanation:
Jasmin has two gases in separate containers. One gas is colorless, while the other is brown. She connects the containers and allows the gasses to mix. What change indicates that the gases are chemically reacting
Alteration in Temperature, Color Change Noticable Odor, Developing a Precipitate and The emergence of bubbles are the factors indicates that the gases are chemically reacting.
The chemical shift that takes place in reactants during chemical reactions typically manifests as either an obvious alteration, a change in temperature, or other elements that are simple to see or detect. These are the end consequence of the creation and destruction of chemical bonds, which are basically atoms within molecules being rearranged The newly generated material would have unique qualities distinct from those of the original substance. The variances may plainly be seen and are proof of the chemical processes involved in its production.To know more about chemical reactions visit : https://brainly.com/question/14929452
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A block has a side length of 2.0 cm x 5.6 cm x 11.4 cm. The block has a density of 8.5 g/cm³. What is the block's mass?
A block has a side length of 2.0 cm x 5.6 cm x 11.4 cm
he block has a density of 8.5 g/cm³.
block's mass = ?
from above statement we have got volume = 2.0 * 5.6 * 11.4
= 127.68cm³
density = 8.5 g/cm³.
now density = mass / volume
mass = density * volume
mass = 1,085.28 g
density is the amount of matter in a given space, or volumeCommon units for density are g/cm^3 or g/mL or kg/m^3 or kg/Ldensity is a physical propertyObjects that float in water have a density have less than 1 g/mLTo know more about density visit :
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Direction: Read the sample scientific method problem below and answer the following questions.
You and your friend are walking along a beach in Maine on January 15, at 8:00 am. You notice a thermometer on a nearby building that reads -1°C. You also notice that there is snow on the roof of the building and icicles hanging from the roof. You further notice a pool of sea water in the sand near the ocean. Your friend looks at the icicles and the pool and says, "How come the water on the roof is frozen and the sea water is not?" You answer, "1 think that the salt in the sea water keeps it from freezing at -1°C." You go on to say, "And I think under the same conditions, the same thing will happen tomorrow." Your friend asks, "How can, you be sure?" You answer, "I'm going to get some fresh water and some salt water and expose them to a temperature of-1°C and see what happens."
Pakilagay nden ng scientific method.
While sea water does not freeze at -1°C, fresh water does.
The prediction will be "I think that the salt in the seawater keeps it from freezing at -1 Celcius."
The problem statement is "How come the water on the roof is frozen and the sea water is not?"
The statement that contains data is "I'm going to get some fresh water and some salt water and expose them to a temperature of-1°C and see what happens."
In a temperature of -1°C, fresh water is frozen while sea water is not.
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What group of elements tend to lose electrons?
Answer:
metals tend to lose electrons
In which region is the substance in both the solid phase and the liquid phase?
1
2
3
4
2 is the region where the substance is in both solid and liquid phases.
The term "phase" refers to a uniform or homogeneous quantity of matter that may be mechanically separated from a nonhomogeneous mixture. It can be made up of a single material or a combination of substances. Although crystalline, colloid, glassy, amorphous, and plasma phases are thought to exist, the three basic phases of matter are solid, liquid, and gas.
A phase change is defined as the transformation of a phase from one form to another. A system can have phases that are solid, liquid, or gaseous. Strong atomic bonds and high viscosity give solids their characteristic rigid form. Insofar as they have a three-dimensional periodic atomic arrangement, most solids are crystalline; nevertheless, certain materials lack this periodic organization and are noncrystalline, or amorphous.
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help me pleaseeeeeeee
Answer:
Solid and lipid element
Does brass contain elements only?
The brass is neither an element nor a compound but it can be a mixture.
What is brass? Does brass contain elements only?
Brass is an alloy of copper and zinc. It can be used achieve mechanical, electrical and chemical properties.
We can say that from the definition the brass is neither element nor the compound but it can be a mixture. Brass is a homogenous mixture of the metals Copper and zinc. The common percentage of the brass is 65% of cooper and 35% of zinc.
Brass is used for preventing the corrosion and also used for providing low friction. The brass is commonly used in locks, zippers, plumbing, electrical plugs and in sockets. The used of the brass is not widely range but it is commonly used for the decorating purposes.
So we can conclude that the brass is neither an element nor a compound but it can be a mixture.
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Which of the following values is the same as 400.0 mm?
a) 4.000 m
b) 4.000 x 106 nm
c) 4.0 x 10³ cm
d) 4.000 x 10-4 km
106 μm
e) 4.000 × 106
Conversion of units is the conversion between different units of measurement for the same quantity and the values is the same as 400.0 mm is 4.0 x 10³ cm
Here given value are 400.0 mm and the value are in millimeter we have to convert mm into cm so 1 millimeter = 0.1 centimetre
Here given value are 400.0 mm in that only decimal point correction are seen means here three zeros are seen then we will write this zeros in 10 raised to power then correct option is c means 4.0 x 10³ cm
400.0 mm×1cm/10³ = 4.0 x 10³ cm
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1. How many MOLECULES of sulfur dioxide are
present in 2.70 moles of this compound?
16.254 × [tex]10^{23}[/tex] molecules
The formula for sulfur dioxide is [tex]SO_2[/tex].
MOLECULES of sulfur dioxide are present in 2.70 moles of this compound
so, we have given the moles of [tex]SO_2[/tex] = 2.70 moles
we have find the number of molecules = ?
1 mole of Na = 6.022×[tex]10^{23}[/tex] molecules
so 2.70 moles of SO2 contains = 2.70[tex]\times[/tex] 6.022×[tex]10^{23}[/tex] molecules
moles of SO2 contains = 16.254 × [tex]10^{23}[/tex] molecules
mole is the number of atoms of an element is equal to the number of atoms in exactly 12.0 g of carbon 126.02 X 10²³ is Avogadro's Number6.02 X 10²³ is the number of particles, atoms, or ions in a moleTo know more about moles visit :
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answer 21 pls and thx
Considering the image, sample A bears the lowest value of Temperature change,
This is further explained below.
What is temperature change?Generally, When there is a rise or decrease in temperature as a result of the transfer of heat, this is referred to as a temperature change.
This causes a change in the chemical equilibria toward the products or the reactants, which may be identified by examining the reaction and determining whether or not it is endothermic or exothermic.
In conclusion, Taking into consideration the picture, sample A has the lowest value of temperature change; this indicates that it will take the most time to cool down or change the temperature while it is being cooled down.
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what happens when rocks that contain iron undergo oxidation in air?
These rocks turns into the rust by the process of the oxidation. As rust can be expands, so it can weakens the rocks and helps break it apart.
What happens when rocks that contain iron undergo oxidation in air?
We know that from our daily life rust for example is iron oxide. When specially the rocks which contains the iron, if exposed or leave to the water and air, then the iron undergoes an oxidation reaction as a result which can weaken the rocks and make the rocks crumble from the inside.
Actually the oxidation produces an iron oxides minerals. The process of the rusting can also change the colour of the iron. It can be changed in several colours like red, brown or yellow.
So we can conclude that these rocks turns into the rust by the process of the oxidation. As rust can be expands, so it can weakens the rocks and helps break it apart.
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How many electrons can fill all the p orbits from n = 1 through n = 3?
A.3
B.18
C.12
D.6
the correct option is c = 12 electrons.
There are fours quantum numbers
1) Principal Quantum Number (n)
The 'n' represent the shellit also tells the size of an orbitals.2) Azimuthal Quantum Number (L)
The 'L' represent the subshells.L = n-1 , It means the shell divides into the smaller groups called orbitals.l 0 1 2 3 4 5 Orbitals s p d f g h3) Magnetic Quantum Number (ml)
ml = -l, 0, +lIt tells the orientations of orbitals.This number divides the subshell into the orbitals which holds the electrons = 2l+1.using the above information ,
4) If n= 1
L = N-1
L = 1-1 =0
'0' represent the S orbital.
each orbital can hold hold only two electrons.
The number of orbital is = 1S
4) If n= 2
L = n-1
L = 2-1
L = 1
m = -L , 0 , +L
M = +1 , 0 , -1
The number of orbitals is = 1s , 2s and 2p (Only two orbitals.)
each orbital can have only two electrons , S orbital contains two electrons and 2p (2px, 2py,2pz)= 6 electrons.
5) If n=3
L= n-1
L = 3-1= 2
L = 0,1,2
number of orbitals = S, P,D
m = -2,-,1,0,1,2
The number of orbitals are = 1S ,2S,2p, 3p ,4d
3p contains the electrons = 6 electrons.
So the number of electrons contains in p orbital from n=1 to n= 3 is 0+6+6= 12 electrons.
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