A because according to electron sea theory magnesium shares two valence electrons in electron sea while sodium shares one suggesting that magnesium has stronger metallic bond than sodium so breaking metallic bond in magnesium will require more energy as compared to breaking metallic bond in sodium
The melting point of magnesium is higher than the melting point of sodium because it contributes two additional electrons per atom than sodium in the electron sea. Thus option d is correct.
What is melting point?Melting point of a substance is the temperature at which it converts from solid state to liquid state where, the two phases are in equilibrium. Melting point is affected by the bond type, molecular weight, temperature and pressure.
Melting point of elements increases along a period because the atomic size is decreasing along the period and molecular weight is increasing. Thus, the nuclear attractive pull increases resulting in higher energy needed to break the attractive force.
Magnesium is 12th element and sodium is 11th element. Thus magnesium is smaller than sodium and have one more electron than sodium. Thus magnesium have high molecular weight and high nuclear attraction leads to its higher melting point.
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HELLPP!!!
What property allows objects to be subject to gravity?
friction
mass
inertia
acceleration
Answer: i gotcu the answer is mass
Explanation: The more weight of the object the more its subject to gravity like a feather barley is while a bowling ball smashes into the ground :D
The property allows objects to be subject to gravity is mass. Therefore, option B is correct.
What is mass ?Mass is a physical body's total amount of matter. Inertia, or the body's resistance to acceleration when a net force is applied, is also measured by this term.
The strength of an object's gravitational attraction to other bodies is also influenced by its mass. The kilogram serves as the SI's fundamental mass unit. The amount of matter object present is also known as mass.
The amount of matter that makes up every item or body is the greatest way to understand mass. Everything that we can see has mass. Examples of objects with mass include a table, a chair, your bed, a football, a glass, and even air. The mass of a thing determines whether it is light or heavy.
Thus, option B is correct.
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1) What type of molecule is water and why? Show its lewis structure, shape, and
explain what type of compound it is in terms of bond type and symmetry.
2) Which part of the water molecules will attract to the negatively shared balloon
and why? Show how the water molecule aligns itself to the negative part of the
balloon.
(PLeASE HeLP)
Answer:
I DO NOT UNDERSTAND THE QUESTION, BUT THANKS FOR THE COINS/TOKENS!
Explanation:
what’s another term for weak solutions
If u mean in terms of concentration, it will be 'Dilute'
One that is almost or entirely ionized in water is considered to be a strong acid or alkali. Nitric acid, sulfuric acid, and hydrochloric acid are a few examples. Weak solutions are not ionized in water.
What is a weak solution ?Bases provide a similar problem: a strong base is one that is completely ionized in solution. A weak base is one that is less than 100% ionized in solution.
The fundamental elements that do not completely ionize in water are known as weak bases. Ammonia is one substance that is a weak base. A portion of NH3 that dissolves in water separates into ammonium cation.
An acid that partially separates into its ions in water or an aqueous solution is referred to as a weak acid. On the other hand, in water, a strong acid completely dissociates into its ions. While the conjugate acid of a weak base is also a weak acid, the conjugate base of a weak acid is also a weak solution.
Thus, Weak solutions are not ionized in water.
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Because of hydrogen bonding,
Select one:
a. liquid water is less dense than ice
b. ice sinks to the bottom of water
c. lakes freeze from the bottom up
d. ice is less dense than liquid water
Answer:
c. lakes freeze from the botton up
The F1-ion is classified as a(n).
and has:
A.anion, 1 valence electron
B.anion, 8 valence electrons
C.cation, 2 valence electrons
D.cation, O valence electrons
Answer:
B
Explanation:
The [tex]\rm \bold{F^1^-}[/tex] is the fluorine anion with 8 valence electrons. Hence, option B is correct.
An ion is defined as the atom with the change in the valence electrons by the loss or gain of electrons to complete the outer shell.
What type of ion is [tex]\rm F^1^-[/tex]?The ions with the gain of electrons result in a negative charge and are termed anions. The ions with a loss of electrons have a positive charge and are termed cations.
The F is the halogen atom of group 17 with 7 valence electrons. The ion formed for F requires 1 electron to complete its valence shell.
The ion [tex]\rm F^1^-[/tex] has a negative charge, which denotes it gains an electron and forms anion.
The gain of electrons results in the number of valence electrons being 8.
Thus, [tex]\rm F^1^-[/tex] is the fluorine anion with 8 valence electrons. Hence, option B is correct.
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describe meteor showers
Answer:
a rain of asteroids coming from space
Explanation:
Why might an increase in the concentration of greenhouse gases be a concern? What
might be the effect of an increase? Use the diagram to help you answer.
Answer:
too many greenhouse gases can cause the temperature to increase out of control. ... The increased greenhouse effect is causing changes in our planet that can affect our lives. The major Greenhouse Gas, carbon dioxide, emitted naturally and by the burning of fossil fuels, stays in the atmosphere a long
Effects: By increasing the concentration of greenhouse gases in the atmosphere, we’re amplifying the planet’s natural greenhouse effect and turning up the dial on global warming.
The atmosphere of the Earth may begin to trap more and more heat if these greenhouse gases are present in excess. Earth warms as a result of this.
What are Greenhouse gases?A greenhouse gas is a gas that produces the greenhouse effect by both absorbing and emitting radiant energy at thermal wavelengths that are infrared. The five main greenhouse gases in the atmosphere of Earth are ozone, carbon dioxide, methane, and water vapour.
Carbon dioxide, methane, nitrous oxides, and water vapour are examples of greenhouse gases. (A "feedback" is the term used to describe water vapor, which reacts chemically or physically to changes in temperature.) Scientists have found that the warming effect of carbon dioxide contributes to the stabilisation of Earth's atmosphere.
Thus, the atmosphere of the Earth may begin to trap more and more heat if these greenhouse gases are present in excess. Earth warms as a result of this.
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BALANCE THE FOLLOWING EQUATION
1.) Sc(C2H3O2)3 + Na3BO3 = NaC2H3O2 + ScBO3
2.) Ba3(PO4)2 + Ca2SiO4 = Ba2SiO4 + Ca3(PO4)2
Answer:
1) Sc(C2H3O2)3 + Na3BO3 = 3 NaC2H3O2 + ScBO3
2) 2 Ba3(PO4)2 + 3 Ca2SiO4 = 3 Ba2SiO4 + 2 Ca3(PO4)2
What category of organisms makes up the largest percent of the the fossils discovered? A. Land animals B. Marine animals C. Microorganisms
Answer:
Marine animals
Explanation:
A fossil is any remains of ancient life. Fossils can be body fossils, which are remains of the organism itself or trace fossils, such as burrows, tracks, or other evidence of activity(Lumen Learning).
Fossils of land animals are less common because they may not have been buried. However, land organisms may become buried underneath by mudslides or ash from a volcanic eruption, or covered by sand in a sandstorm.
Marine fossils are more common owing to quick burial. Marine animals that die near a river delta may be buried by sediment carried by the river. A storm at sea may shift sediment on the ocean floor, covering and helping to preserve skeletal remains(Lumen Learning).
mass-mass problem:
If 25.0 grams of carbon dioxide are used in photosynthesis how many grams of glucose (C6H12O6) could be Produced according
to the following equation : 6CO2 + 6H2O → C6H12O6 + 602
Answer:
17.05 g of glucose
Explanation:
The equation of the reaction is given as;
6CO2 + 6H2O → C6H12O6 + 602
From the equation;
6 mol of CO2 produces 1 mol of C6H12O6
Converting to masses;
CO2:
Mass =Number of moles * Molar mass
Mass = 6 mol * 44 g/mol = 264 g
C6H12O6:
Mass = Number of moles * Molar mass
Mass = 1 mol * 180 g/mol = 180 g
This means 264g of CO2 produces 180g of C6H12O6
25g of CO2 would produce x g of C6H12O6
264 = 180
25 = x
x = 25 * 180 / 264
x = 17.05 g
Which is a liquid that is used to absorb and release thermal energy?
coolant
lubricant
grease
fuel
Answer
grese
Explanation:
Any liquid could absorb and release thermal energy. However, a refrigerant or a coolant absorbs heat and releases it to any area faster than any ordinary liquid such as water. So to complete the sentence: A refrigerant/cooler is a liquid that absorbs and releases thermal energy
Answer:
The correct answer is coolant.
Hope it helps. :)
What is the answer to the formula 12+6/2+10?
0 25
O 14
O 19
03.6
The answer was 25
Do according to bodmas rule
in sublimation which state of matter is absent
sublimation is the transition of a substance directly from the solid to the state without passing through the liquid state
Which statements describe band theory? Check all that apply.
Electrons all have approximately the same energy.
Electrons move among orbitals of different energies.
Electrons move freely among atoms (delocalized).
Answer:
b c
Explanation:
right
Answer:
it was A C for me
Explanation:
Determine whether each item is an example of preservation or conservation. Yellowstone National Park Mining regulations No-fly zones Endangered Species Act Captive-breeding programs Big Cypress National Preserve
Answer:
Yellowstone National park-preservation
Mining Regulations- conservation.
Captive Breeding programs- conservation
Big Cypress National preserve-Preservation
No Fly zones conservation
Endangered species act- preservation
Explanation:
Conservation seeks the proper use of nature, while preservation seeks protection of nature from use.
The example of the preservevation or conservation are :
Yellowstone National park - preservation mining rules - conservation.captive programs- conservation cypress preserve - Preservationno Fly zones - conservation.endangered species act - preservationWhat is the difference between preservation and conservation?Preservation is the action of preserving something such as to protect or to keep alive something parks are meant for preservation purposes. Conservation is a wasteful use of resources. Conservation includes the preservation of natural resources.
Find out more information about the preservation.
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DUE IN 10 MINUTES I WILL MAKE YOU BRAINILIST
Answer:
Ernest Rutherford postulated the nuclear structure of the atom, discovered alpha and beta rays, and proposed the laws of radioactive decay. He received the Nobel Prize in Chemistry in 1908.
Erwin Schrödinger proposed the quantum mechanical model of the atom, which treats electrons as matter waves. ... The Heisenberg uncertainty principle states that we can't know both the energy and position of an electron.
hope it helps
Al +CI = Al CI3
how do i solve this
6) Mr. Collins finally decided to take this seriously and put both hands on the rope and applied a 500 N force to the left,
while Jared and James still struggled with their 300 N force to the right. What is the net force and direction of motion?
Answer:
I'm pretty sure the net force is 200 N and the direction of motion is left
Explanation:
500 - 300 = 200 and more force is coming from and pulling toward the left.
What temperature scale is used in the ideal gas equation?
A. Kelvin
B. Fahrenheit
C. Celcius
D. Doesn't matter
kelvin
hope that helps^^
consider a sample of compound contain 1.719c 0.284gh so find emprisical formula
What is the name for: CO2?
AND
Describe the steps for how you determined this.
Answer:
carbon dioxide
C = carbon
O2 = dioxide
how many atoms of alumminum are in 3.9 mol of aluminum
Answer:
2.35 x 10²⁴ atoms Al
Explanation:
Given 3.9 moles of aluminum (Al), determine number of aluminum atoms in that quantity of substance.
By definition a mole is the mass of substance containing one Avogadro's Number (N₀) of particles. That is, 1 mole = 1 N₀ = 6.023 x 10²³ particles*.
So, if 1 mole aluminum contains 6.023 x 10²³ atoms of aluminum then
3.9 moles Al = 3.9 moles Al x 6.023 x 10²³ atoms Al/mole Al = 2.35 x 10²⁴ atoms Al.
________________
*The complete equivalent relationship is ...
1 mole (atoms or compounds) = 6.023 x 10²³ atoms or molecules = 1 formula weight of the substance = 22.4 Liters (if in gas phase at STP conditions (0°C and 1atm pressure).
________________
Sure hope this is understandable ... if not, kick back a note. Doc
true or false the membrane of rer is continuous with the outer layer of the mithochondrial membrane
Answer:
false
Explanation:
it is the combination of the uppermost mantle and the crust
Answer:
lithosphere
Explanation:
6. El oxígeno gaseoso se calienta a presión constate de 50 °C a 300 K. Se conoce que inicialmente el volumen del sistema era de 1,3 litros. ¿Cuál es el volumen final del sistema?
Answer:
El volumen final del sistema es 1.2L
Explanation:
La ley de Charles establece que el incremento de la temperatura de un gas produce un incremento en el volumen directamente proporcional cuando la presión permanece constante. La ecuación es:
V₁/T₁ = V₂/T₂
Donde V es volumen y T temperatura absoluta de un gas en 1, el estado inicial y 2, su estado final.
Reemplazando:
V₁ = 1.3L
T₁ = 50°C + 273.15K = 323.15K
V₂ = Incógnita
T₂ = 300K
1.3L/323.15K = V₂/300K
1.2L = V₂
El volumen final del sistema es 1.2L1.0 mol of ethanol and 1.0 mol of acetic acid are dissolved in water and kept at 100 °C. The volume of the solution is 250 mL. At equilibrium, 0.25 mol of acetic acid has been consumed in producing ethyl acetate. Calculate Kc at 100 °C for the reaction C2H5OH(aq) + CH3CO2H(aq) CH3CO2C2H5(aq) + H2O(l)
Answer:
Kc = 0.333
Explanation:
First of all we state the equilibrium reaction:
C₂H₅OH(aq) + CH₃CO₂H(aq) ⇄ CH₃CO₂C₂H₅(aq) + H₂O(l)
Initially we start with 1 mol of alcohol and 1 mol of acid. After the reaction goes complete, 0.25 moles of acid have been consumed. As ratio is 1:1, we also consumed 0.25 moles of alcohol. Then, in the product side we finally produced 0.25 moles of water and 0.25 moles of ethyl acetate.
How many moles are available in the reactant side, after the equilibrium?
1 mol - 0.25 moles (that have been reacted) = 0.75 moles.
To determine Kc, we need molar concentrations, so let's see M in products and reactants:
0.75 mol / 0.25 L = 3 M
0.25 mol / 0.25 L = 1 M
We needed to convert 0.250 mL to L → 0.250 mL . 1L/ 1000mL = 0.250 L
Let's determine expression for Kc:
Kc = [H₂O] . [CH₃CO₂C₂H₅] / [C₂H₅OH] . [CH₃CO₂H]
1 . 1 / 3 . 3 = 1/9 → 0.333
What is Temperature
Choose 1
Answer:
B. A measure of the average kinetic energy of a substance.
Explanation:
Temperature is a measure of the average kinetic energy of the particles in an object.
Brainlist pls!
the seven continents used to be one huge supercontinent called Ppaonderosa, Panhandle, Pangaea, Panthalassa
Answer:
Pangaea
Explanation:
Answer:
Pangea
Explanation:
Pangaea or Pangea was a supercontinent that existed during the late Paleozoic and early Mesozoic eras. It assembled from earlier continental units approximately 335 million years ago, and it began to break apart about 175 million years ago
Which have a mass of 0 amu ?
I give Brainliest!!!!
Answer:
Electrons
Explanation:
Protons and Neutrons have an amu of 1
Answer:
c. Electrons
Explanation:
Electrons are found outside the nucleus and are the lightest.
explain why dilute trioxosulphate vi acid is not used to prepare carbon 4 oxide from calcium
trioxocarbonate 4
Answer:
H2SO4 cannot be used with CaCO3 to produce CO2 gas
Explanation:
Because it does not dissolve in water- it forms a barrier on the surface of the unreacted CaCO3 which prevents any further reaction. A small volume CO2 is produced, this stops in short time.
I hope this helps :)
