Answer:
(1) In the modern day periodic table the atomic size is increasing when we move down the group and it decreases when we move along the period from left to right. that's why Within a family such as the alkaline earth metals, the ionic radius increases as the atomic number increases. Alkaline earth metals have loosely held electrons which results in its increased size.
(2) The radius of the bromine atom is smaller than the radius of the bromide ion, Br-1 this happens because bromine is a non metal, and it also has a high electronegativity among other group elements as halogen group has high electronegativity. when the bromine acquires one extra electron and forms [tex]Br^-[/tex] ion, the configuration of bromine earlier was [tex]1s^22s^22p^63s^23p^64s^23d104p^5[/tex] but on addition of the electron the p shell will now have 6 electrons resulting in [tex]1s^22s^22p^63s^23p^64s^23d104p^6[/tex]the newly added electron repels the former neutral orientation and as a result of repulsion the size increases.
(3) The first ionization energy of Aluminum is lower than that of the first ionization energy of magnesium because magnesium has fully filled [tex]3s^2[/tex] orbital whereas Aluminum has one electron in the 3p orbitals, fully filled 3s orbitals has strongly held by the nucleus in case of Mg whereas 3p orbitals is shielded from the nucleus therefore it becomes easy to take out 3p electron that 3s electron.
A student is asked to determine the chemical formula for the compound Barium
chloride. When writing the chemical formula, what question will the student need to
ask to determine the correct formula?
What period does barium belong to?
Are barium and chlorine a metal and nonmetal?
What is the state of matter of each element that comprises the final formula?
What are the charges of each atom?
Answer:
Are barium and chlorine a metal and nonmetal?
Explanation:
I had the same question, and my class reviewed the test and this was the answer to this question.
10.0 grams of a gas occupies 12.5 liters at a pressure of 42.0 mm Hg. What is the volume when the pressure has increased to 75.0 mm Hg? 6.72 L 7.00 L 22.3 L 0.143 L
Answer: 7.00 L
Explanation:
Boyle's Law: This law states that pressure is inversely proportional to the volume of the gas at constant temperature and number of moles.
[tex]P\propto \frac{1}{V}[/tex] (At constant temperature and number of moles)
[tex]P_1V_1=P_2V_2[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas = 42.0 mm Hg
[tex]P_2[/tex] = final pressure of gas = 75.0 mm Hg
[tex]V_1[/tex] = initial volume of gas = 12.5 L
[tex]V_2[/tex] = final volume of gas = ?
[tex]42.0\times 12.5=75.0\times V_2[/tex]
[tex]V_2=7.00L[/tex]
Therefore, the volume when the pressure has increased to 75.0 mm Hg is 7.00 L
Where are chlorofluorocarbons (CFCs) found? Why were they banned?
Answer:
A gaping hole in the ozone layer over Antarctica was discovered in the mid 1980s. The international community agreed the Montreal Protocol in 1987, which banned most of the offending chemicals.
Hope this helps..most abundant noble gas in the air
Answer:
Argon
Explanation:
I'm pretty sure it's argon.
What is the significance of the color of the light observed in a line spectrum?
help meeeeeeeeeeeee its impossibleeeeee
Answer:
Nice! If only....
Explanation:
Answer:
omg lol what even is this
describe the density of a golf ball
Answer:
the nominal density of a golf ball is to be approximately 0.65 ounces per cubic inch.
Explanation:
The only nonmetal in Group 14 is
A carbon.
B. oxygen.
C. nitrogen.
D. fluorine.
Answer:
carbon
Explanation:
i just googled it
CH(4)+ 20(2)→ CO2+ 2H(2)O
22.
The reaction shown above is an example of a -
a. synthesis reaction
b. combustion reaction
c. decomposition reaction
d. double displacement reaction
Answer:
Reaction is a Combustion reaction
PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP
DETERMINE THE MASS NUMBER OF EACH OF THE ISOTOPES OF LITHIUM
Answer:
not sure about it .I also need an answer
Which of these are an atom's valence electrons?
Answer:
The Outer-most Electron shell contains the valence electrons.
Bonus Info:
Valence Electrons are used by atoms to make ionic bonds.
Answer:
Valence electrons are the electrons in the outermost shell, or energy level, of an atom. For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell. We can write the configuration of oxygen's valence electrons as 2s²2p⁴.
Explanation:
ur welcome
i was doing this in school and i watched a video
can someone help me??
Which action is a result of gravity in relation to moving tectonic plates?
Earth's internal heating
circulating material in the mantle
ridge push and slab pull
Earth's magnetic field reverses
Answer:
I do K12 and c is correct!
Answer: B. ridge push and slab pull
Explanation: Took the test.
Question 12 (100 points)
(03.04 LCO.
Which of the following is a compound? (100 points) A Cl2
B H20
C He
D H2
Answer:
H20 is a compound so it's the answer
Explanation:
Have a good day
Answer:
d
Explanation:
Which change will produce a new substance
Answer:
Chemical change
Explanation:
Because it will be 2 mixtures of each substances making it 1 substance, and 1 change.
in an experiment 3.5g of element A reacted with 4.0g of element G to form a compound Calculate the empirical formula for this compound
Additional information
Relative atomic mass(Ar) : A=7, G=16
The empirical formula : A₂G
Further explanationGiven
3.5g of element A
4.0g of element G
Required
the empirical formula for this compound
Solution
The empirical formula is the smallest comparison of atoms of compound forming elements.
The empirical formula also shows the simplest mole ratio of the constituent elements of the compound
mol of element A :
[tex]\tt mol=\dfrac{mass}{Ar}\\\\mol=\dfrac{3.5}{7}=0.5[/tex]
mol of element G :
[tex]\tt mol=\dfrac{4}{16}=0.25[/tex]
mol ratio A : G = 0.5 : 0.25 = 2 : 1
Using the electronegativity chart below, determine which compound would have the highest polarization
A. Li-O
B. B-F
C. H-CI
D. Be-Br
Answer:
A. Li-O
Explanation:
The highest polarization will occur between the atoms of Li-O because they have the most electronegativity difference between them.
Polarization occurs when there is a separation of charge between the atoms of heteronuclear molecules.
The electronegativity gives the tendency for an atom to attract the electrons within the bond pair to itself.
To know the atom with most polarization, it has to be one with highest electronegativity difference. Li and O have the highest difference. Also, since the bond is between a metal and non-metal, it is obviously the most polarized.
Catalysts, including enzymes, have the role of Select one: a. changing a nonspontaneous chemical reaction to spontaneous. b. lowering the activation energy of a reaction. c. heating up the reactants to make the reaction progress faster. d. changing the pH to a favorable pH for the reaction to progress.
Answer:
Lowering activation energy of a reaction.
Explanation:
Activation energy is the minimum amount of energy required by the reactants just to be converted to products.
Since catalysts increase the rate of reaction, activation complex is reached in short period of time hence activation energy is lowered.
Help Please I'll mark Brainiest!
Write three observations that could help you identify this organism.
Answer:
the unidentified animal looked like a slug, it looked like it lives or can be in water, the body of the unidentified animal is purple, it seems to have an orange spikes coming out of it's backs.
Do You Know That If you put a Grape in the microwave it will go on Fire!?
Answer:
really?!?! well did u know oranges can get stale??
Why does soap work to remove oil? (Note that most oils can be considered non-polar. A soap molecule has one end that is polar and one end that is non-polar.)
Answer:
Soap breaks up the oil into smaller drops, which can mix with the water.
Explanation:
This works because soap is made up of molecules with two different ends.
The soap molecules works as a surfactant for the water oil interphase. The hydrophobic head of the soap molecules trap the oil and dirt ad remove from the surface.
What are surfactants?Surfactants are chemical substances used to reduce the interfacial tension between substance boundary. Soaps and detergents acts as surfactants which are used to remove the dirt and oil from material surface.
Soap has both polar and non-polar characteristics. The alkaline part in the soap causes it to have a polar head, and because of the electric charge on this head, the soap is hydrophilic. A hydrophilic part of soap is drawn to water and will cling to it.
In this instance, the positive-charged hydrogen atoms of the water's hydrogen atoms match with the polar head of the soap molecule. The other part of soap is a fatty acid tail, which is hydrophobic and can bind with the oil and dirt. The trapped oil molecules are then be removed by water.
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Cylinder A and Cylinder B are sealed, rigid cylinders with movable pistons. Each cylinder contains 500. milliliters of a gas sample at 101.3 kPa and 298 K. Cylinder A contains H2 and cylinder B contains N2. Explain, in terms of collisions between gas molecules and the walls of the container, why pushing the movable piston farther into cylinder B at constant temperature would increase the pressure of the N2 gas.
Answer:
The pressure of N₂ gas in cylinder B when compressed at constant temperature increases due to the increase in the frequency of collision between the gas molecules with themselves and with the wall of their container caused by a decrease in volume of the container.
Explanation:
Gas helps to explain the behavior of gases when one or more of either temperature, volume or pressure is varying while the other variables are kept constant.
In the gas cylinder B, the temperature of the given mass of gas is kept constant, however, the volume is decreased by pushing the movable piston farther into the cylinder. According to the gas law by Robert Boyle, the volume of a given mass of gas is inversely proportional to its pressure at constant temperature. This increase in pressure is due to the increase in the frequency of collision between the gas molecules with themselves and with the wall of their container caused by a decrease in volume of the container. As the cylinder becomes smaller, the gas molecules which were spread out further become more packed closely together, therefore, their frequency of collision increases building up pressure in the process.
In terms of collisions between gas molecules and the walls of the container, the reason why pushing the movable piston farther into cylinder B at constant temperature would increase the pressure of the N2 gas is due to the fact that;
The movement of the piston farther into the cylinder would lead to an increase in the number of collisions per unit area between the N2(nitrogen) molecules and the internal walls of the cylinder. The movement described above would lead to creation of greater pressure because the more the collisions, the higher the pressure.The image showing the two cylinders are missing and so i have attached it.
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Find the mass of 7.00 mol of H2O2?
Answer:
238g
Explanation:
Molar Mass (1 mol) of H2O2 = 34.0147 g/mol
7.00 mol = 35.0147*7
= 238.1029g
= 238g (rounded to 3 sig figs because 3 sig figs in 7,00)
Answer:
answer in picture
Explanation:
dicarbon heptasulfide chemical formula
Answer:
C2S7
Explanation:
To solve this we must be knowing each and every concept related to chemical formula. Therefore, the chemical formula for the given molecule dicarbon hepta sulfide is C[tex]_2[/tex]S[tex]_7[/tex].
What is chemical formula?A chemical formula is a scientific notation that uses atomic symbol and numerical subscripts to represent the number and types of elements contained in a molecule. A chemical formula seems to be a concise written description of an existing three-dimensional molecule.
A chemical formula characterizes a material to the atomic level. There are three sorts of chemical formulas: empirical, molecular, and structural. The chemical formula for the given molecule dicarbon hepta sulfide is C[tex]_2[/tex]S[tex]_7[/tex].
Therefore, the chemical formula for the given molecule dicarbon hepta sulfide is C[tex]_2[/tex]S[tex]_7[/tex].
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SOMEONE HELP ME PLEASE I’LL GIVE BRAINLY
Chemical change
physical change
Answer:
Chemical
Explanation:
An element in group 3 that is a good conductor of electricity.
Answer:
Well for me I think
Explanation:
it's Aliminium
Answer:
Aluminum is good in heat and conductor
The partial symbol for a particular ion is 26M2+ What are the number of electrons contained in one ion
Answer:
24
Explanation:
26-2=24 because when an atoms loses 2 electrons it gains 2+ charge
What is a control group?
Answer:
A control group is someone who takes control over something so a tyrant or a dictator.
Explanation:
If this isnt what your looking for let me know, there wasnt alot of context.
Answer: a group that helps you control something
Explanation: like a surport group but for addictions maybe
Each electron can be represented by 4 quantum numbers. The two electrons in the outermost level of strontium are designated at 5 s . How many quantum numbers would these two electrons have in common
Explanation:
They are both in shell 5 and subshell s.
Since s only has 1 orbital, they also have the same orbital number.
But they have different magnetic spins.
Hence 3 out of 4 quantum numbers are in common.
How are ocean waves different from sound waves?
a. ocean waves are longitudinal waves, sound waves are transverse waves
b. ocean waves are electromagnetic waves, sound waves are mechanical waves
c. ocean waves are mechanical waves, sound waves are electromagnetic waves
d. ocean waves are transverse waves, sound waves are longitudinal waves
Answer:
C
Explanation:
Ocean waves are something we can see. We cannot see Sound waves.
Answer:
the correct answer is B
Explanation:
Sound waves are longitudinal waves.
I can be found in the 4th period on the periodic table.
Vanadium (V)
Zirconium (Zr)
Carbon (C)
Beryllium (Be)
Vanadium (V)
Vanadium is the only one in the 4th period here so