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Periodic table
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WRITTEN BY
J.J. Lagowski See All Contributors
Professor of Chemistry, University of Texas at Austin. Author of The Chemical Bond.
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Alternative Title: periodic table of the elements
Study chemistry's periodic law to understand elements' properties and how they relate to one another
Study chemistry's periodic law to understand elements' properties and how they relate to one another
Explanation of the periodic table.
Encyclopædia Britannica, Inc.
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Periodic table, in full periodic table of the elements, in chemistry, the organized array of all the chemical elements in order of increasing atomic number—i.e., the total number of protons in the atomic nucleus. When the chemical elements are thus arranged, there is a recurring pattern called the “periodic law” in their properties, in which elements in the same column (group) have similar properties. The initial discovery, which was made by Dmitry I. Mendeleyev in the mid-19th century, has been of inestimable value in the development of chemistry.
periodic table
Explanation:
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What is the mass of 2.2 moles of Beryllium chloride
Answer:
the mass of 2.2 moles of Beryllium chloride is
Explanation:
175.8200004 gram
is 2Sb+3L2-> 2SbL3 endothermic or exothermic?
Answer:
try working out the bond enthalpies for both sides of the equation :)
Explanation:
I NEED THESE ASAP PLEASE!!!! I WILL MARK A BRAINLIEST...
Magnesium and Chlorine are chemically bonded. Which type of bond holds them
together?
ionic
covalent
neither
Answer:
The answer should be Ionic
Explanation:
prove me wrong
Why are the transition metals able to show different properties like varying color and paramagnetism ?
Answer:
Colors of transition metal compounds are due to two types of electronic transitions. Due to the presence of unpaired d electrons, transition metals can form paramagnetic compounds. Transition metals are conductors of electricity, possess high density and high melting and boiling points.
Explanation:
The transition metals are able to show different properties like varying color and paramagnetism due to presence of unpaired d-electrons.
What are transition metals?The transition metals are defined as the elements in which atoms are present whose d-sub-shell is partially filled .Due to which they give rise to cations with an incomplete d-sub-shell.
They are also defined as the elements which are present in the d-block of the periodic table, which includes groups from three to twelve.These elements are called transition elements as they show a transition between highly electro-positive group 1 and highly electro-negative group 17 elements.
They have characteristic properties due to which they can exist in variable oxidation states , form colored complexes and have catalytic properties as well.These elements are all technologically very important.
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What is the molarity of a solution made by dissolving .75mol of NaCl in 3.0L of solution?
describes the
unbalanced attractive force
toward the interior of the liquid
that molecules experience at the
air-liquid interface.
A. Vapor pressure
B. Surface tension
D. Condensation
C. Boiling point
Answer: B. Surface Tension
Explanation:
It is the tension of the surface film of a liquid caused by the attraction of the particles in the surface layer by the bulk of the liquid, which tends to minimize surface area.
what happens when washing soda is exposed to the atmosphere
Answer:
they lose their water
Explanation:
When exposed to air washing soda crystals lose their water of crystallisation and become amorphous. ∴ The phenomenon is called efflorescence.
(HELP FAST)Which of the following always changes when a substance undergoes a
chemical change?
4. Anh measured the temperature of a pond near his house. Before he left for school, the water in the
pond was 18°C. When he came home from school, the temperature of the pond was higher than it
was in the morning. What happened to the water molecules while he was at school?
The water molecules must have gained more thermal energy while Anh was away from the house.
An increase in the temperature of a body means that the body has gained more energy in the form of heat, also known as thermal energy.
The thermal energy represents the characteristic of a body responsible for its temperature.
An increase in the temperature of the water molecules increases their kinetic energy and, thus, makes the water molecules move around faster than before.
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Write a short note on LAN? Also write down its advantages and disadvantages of LAN?
why one has higher mass and why?
0.5 mole of coz or 16g of sog
so2 has mass of 16gm and co2 has mass
of 22gm. Thus co2 has more mass.
Explanation given in the image.
Hope it helps!
A base used in baking cake is
Answer:
sodium bicarbonate, potassium bicarbonate and ammonium bicarbonate are the most commonly used bases.
Which of the following would increase the intensity of the tornado?
a. decrease in wind speed
b. decrease in condensation
c. increased rate of evaporation
d. increase of cold air
Answer:
c. increased rate of evaporation
Explanation: Tornado strength is affected by many factors including wind speed, size, where the tornado forms geographically, and duration of the tornado. Additionally, conditions for a supercell storm usually intensify the strength of tornadoes such as humidity, atmospheric instability, lift, and vertical wind shear.
QuesLIVII 2 PUNILS)
Explain the difference between ionic, polar covalent and nonpolar covalent bonds and how
electrons are used in the bond. Use the table below to identify the bond present in the 5
molecules. Show your calculations of the electronegativity difference between elements to
support the identified bond.
Element
Carbon
Nitrogen Sodium Chlorine Magnesium Fluorine Hydrogen
(N)
(Mg) (F) (H)
(Na)
(CI)
Electronegativity
2.5
Value
3.0
0.9
3.0
1.2
4.0
2.1
a) MgCl2
b) F2
c) NaCl
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Answer:
See explanation
Explanation:
An ionic bond involves the transfer of electrons from one atom to another. Typically, ionic bond occurs between a metal and a non metal such as between Na and Cl.
A polar covalent bond occurs between two elements having a significant difference in elctronegativity. As a result of this, the shared electron pair is closer to the more electronegative atom thereby making the molecule polar.
A covalent bond involves the sharing of electrons between two atoms that are very close in electronegativity values. The shared electron pair is located at an equidistant position from the nucleus of the both bonding atoms.
For MgCl2, the electronegativity difference is 3.0 - 1.2 = 1.8, the bond is ionic
For F2, the electronegativity difference is 4.0 -4.0 = 0, it is a pure covalent bond.
For NaCl, the electronegativity difference is 3.0 - 0.9 = 2.1, the bond is ionic
what are the coefficients that will balance the skeleton equation
Answer:
When the following equation is balanced, what is the coefficient for HCl? Mg(s) + HCl(aq) -> MgCl2(aq) + H2(g) . 2. What are the coefficients that will balance the skeleton equation below? AlCl3 + NaOH -> Al(OH)3 + NaCl.
In an experiment, the independent variable __________. (WILL MAKE BRAINLIEST)
A.
always influences the dependent variable
B.
is the same for all groups in an experiment
C.
is influenced by the dependent variable
D.
is manipulated or varied by researchers
Thanks to anyone who helps! :)
Answer:
D
Explanation:
Independent variables (IV): These are the factors or conditions that you manipulate in an experiment. Your hypothesis is that this variable causes a direct effect on the dependent variable. Dependent variables (DV): These are the factor that you observe or measure.
How is electrical energy produced??
Answer:
Most electricity is generated with steam turbines using fossil fuels, nuclear, biomass, geothermal, and solar thermal energy. Other major electricity generation technologies include gas turbines, hydro turbines, wind turbines, and solar photovoltaics.
Explanation:
i hope this give you a bit more help
Question 5(Multiple Choice Worth 5 points)
Two samples of water, 10 grams and 50 grams, are in separate cups. Which of the following properties is different for the two?
O Boiling point
O Color
O Density
O Volume
Answer:
Density
Explanation:
Answer: the answer is density
Explanation:
Which of the following is an example of an exothermic reaction?
A. Thermal decomposition
B. Ammonium nitrate and water C. Photosynthesis
D. Respiration
Exothermic reactions release heat when the reactants produce products. The process of respiration is an exothermic reaction as it releases heat. Thus, option D is correct.
What is an exothermic reaction?An exothermic is a type of reaction that involves the release of heat during the reaction through product formation. The respiration reaction is exothermic as it involves the breakdown of oxygen and glucose into energy.
Thermal decomposition is an endothermic reaction as it requires energy for completion. Similarly, photosynthesis and reaction between ammonium nitrate and water are endothermic reactions as they also require energy from the external source.
Therefore, respiration is an exothermic reaction.
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What is the potential energy of a 2 kg rock sitting at the top of a 10 meter high cliff?
Answer:
im sorry im bored can we talk
Explanation:
lol
How many molecules are in 7.5*10^19 particles of Fe2O3?
Answer:
7.5 × 10¹⁹ molecules Fe₂O₃
General Formulas and Concepts:
Chemistry - Atomic Structure
Using Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
7.5 × 10¹⁹ particles Fe₂O₃
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[tex]7.5 \cdot 10^{19} \ particles \ Fe_2O_3(\frac{6.022 \cdot 10^{23} \ molecules \ Fe_2O_3}{6.022 \cdot 10^{23} \ particles \ Fe_2O_3} )[/tex] = 7.5 × 10¹⁹ molecules Fe₂O₃
Jan was told by her mother to clean a kettle which had a heavy deposit of limescale. Her friends suggested the following products that could be used to achieve this: Zippo, Wham Bam, Scale Away and Blorox. Jan found that Scale Away successfully removed the limescale deposit while the others did not. Propose a hypothesis to explain the above observation?
Answer:
what happened when they removed the limescale?
Explanation:
Guys please help me
What happens when the number of electrons and protons inside of or atenie equel?
Answer:
When the number of electrons does not equal the number of protons, the atom is ionized and then they are no longer atoms, they are known as ion(s).
√2a-3 =
√a+ 7 solve
Answer:
[tex] \huge100(3 + 2\sqrt{2} )[/tex]
is the right answer.
when light mass nuclei combine to form a heavier more stable nucleus this is called
Answer:
Nuclear fusion
Explanation:
Science
what is an example of a composite material
Answer:
Reinforced concrete and masonry.
Composite wood such as plywood.
Reinforced plastics, such as fibre-reinforced polymer or fiberglass.
Ceramic matrix composites (composite ceramic and metal matrices)
Metal matrix composites.
Explanation: These are some composite this should help
Which lists the waves in order of wavelength, from longest to shortest?
A) X-rays, infrared, radio waves
B) infrared, visible light, gamma rays
C) ultraviolet, microwaves, visible light
D) radio waves, gamma rays, visible light
Answer:
B
Explanation:
gamma rays have the shortest wave length
Infrared, visible light and gamma rays are lists of the waves in order of wavelength, from longest to shortest. Hence, option B is correct.
What is wavelength?Wavelength is the distance between identical points (adjacent crests) in the adjacent cycles of a waveform signal propagated in space or along a wire.
The electromagnetic spectrum includes, from longest wavelength to shortest: radio waves, microwaves, infrared, optical, ultraviolet, X-rays, and gamma-rays.
Hence, option B is correct.
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What is the vapor pressure at 35°C of a solution made by dissolving 44.6 g of sucrose, C12H22O11, in 62.3 g of water? The vapor pressure of pure water at 35°C is 42.2 torr.
Answer:
The correct answer is 40.861 torr.
Explanation:
Based on the given information, the weight of the solute (sucrose) given is 44.6 grams, the weight of the solvent, that is, water given is 62.3 grams, and 42.2 torr is the vapor pressure of pure water.
Now the molecular weight of sucrose is 342 grams per mole, and the molecular weight of water is 18 grams per mole.
The mole fraction of solute will be,
Mole fraction of solute = Weight of solute/Molecular weight of the solute/Weight of the solvent/molecular weight of the solvent + Weight of the solute/Molecular weight of the solute
= 44.6 grams/342 grams per mole/62.3 grams/18 grams per mole + 44.6 grams/342 grams per mole
= 0.1304/3.461 + 0.1304
= 0.0363
Now using relative lowering of vapor pressure,
Vapor pressure of pure water-Vapor pressure of solution/Vapor pressure of pure water = Mole fraction of solute
42.4 torr - PS/42.4 torr = 0.0363
Ps = 42.4 -1.5395
Ps = 40.861 torr
Hence, the vapor pressure of the solution is 40.861.
RESPONSES MUST BE WRITTEN IN YOUR ANSWER PACKET RESPONSES MUST BE WRITTEN IN YOUR ANSWER PACKETESSAY QUESTION:Answer your essay question in space below 20ptsHow are the key elements of scientific thinking used in the following scenario?(Use 3+ specific examples)While you are heating water in an electric kettle, you notice it fails to boil water. Thinking that some part of the kettle (coil or cord etc.) is malfunctioning, you notice there is no change in the water temperature. Assuming you forgot to plug the kettle in, you check and discover it is plugged into the wall (outlet). You then take the kettle to a different room and try plugging it into a different outlet – you find the kettle works. You conclude that there is no power in the kitchen. Coming back to the kitchen, you turn on the light and find that nothing happens.
Answer:
i mzxd vsdfvdsfbdfdf
Explanation:
Answer:
i dont get it
Explanation:
Calculate the molarity of a solution prepared by dissolving 2.50 mol of KCl into 2.00 L of solution.
________ M
Answer:
1.25 M
Explanation:
The molarity is found dividing the moles of solute by the litres of solution.
2.50 mol ÷ 2 L = 1.25 M
The concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution. Therefore, the molarity of a solution prepared by dissolving 2.50mol of KCl into 2.00 L of solution is 1.25 M.
What is molarity?Molarity can be calculated by dividing number of moles of solute by volume of solution in liter. Molarity is affected by temperature. Its unit is mole/liter. It measure the concentration of any solute in a solution.
Mathematically,
Molarity= number of moles of solute/volume of solution in liter
number of moles of solute KCl= 2.50 mol
volume of solution in litre = 2.00 L
substituting all the given values in the above equation, we get
Molarity= 2.50 mol ÷ 2 L
Molarity = 1.25 M
Therefore, the molarity of a solution prepared by dissolving 2.50mol of KCl into 2.00 L of solution is 1.25 M.
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