Answer:
Rare earth elements are lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium, yttrium - that appear in low concentrations in the ground.
Explanation:
The rare earth elements (REE) are a set of seventeen metallic elements. These include the fifteen lanthanides on the periodic table plus scandium and yttrium. Rare earth elements are an essential part of many high-tech devices.
-. You have 100 grams of methane. How many moles do you have?
Answer:
6.25mol
Explanation:
Using the following formula;
Mole = mass ÷ molar mass
According to this question, there are 100 grams of methane (CH4)
Molar Mass of methane (CH4) = 12 + 1(4)
= 12 + 4
= 16g/mol
mole = 100/16
mole = 6.25moles
Therefore, there are 6.25moles of methane in 100g
ionic bonds show which characteristics that arent seen in covalent bonds
Which compound is a hydrocarbon?
C 2 H 6
H 2 O
CO 2
C 6 H 12 O 6
Answer:
C2H6 OR C6H12O6 THE ANSWER
Explanation:
C2H6
!!!!!!!!!!
because it has both hydrogen and carbon as given in the word "Hydro-carbon"
What characterizes an Arrhenius acid-base reaction?
O A. It forms a conjugate pair.
O B. It forms a salt and water.
O C. It forms hydrogen gas.
OD. It forms a buffer in water.
An Arrhenius acid-base reaction forms a salt and water.
Arrhenius acid base reaction forms a salt and water.
Hence, option (B) is correct answer.
What is Arrhenius acid-base reaction ?Arrhenius acid-base reaction is Arrhenius acid + Arrhenius Base means water + salt. When Arrhenius acid reacts with Arrhenius base it produce water and salt as product. This is known as neutralization reaction.
Thus, from the above conclusion we can say that Arrhenius acid base reaction forms a salt and water.
Hence, option (B) is correct answer.
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Question 7 of 10
How much energy is required to melt 2 kg of aluminum? Use the table below
and this equation: Q- mLfusion
Substance
Latent Heat
Fusion
(melting)
(kJ/kg)
Melting
Point
(°C)
Latent Heat
Vaporization
(boiling) (kJ/kg)
Boiling
Point
("C)
Aluminum
400
660
1100
2450
Copper
207
1083
4730
2566
Gold
628
1063
1720
2808
Helium
5.2
-270
21
-269
Lead
245
327
871
1751
Mercury
11.4
-39
295
357
Water
335
0
2258
100
A. 2200 kJ
B. 800 kJ
C. 1600 kJ
D. 1100 kJ
Answer:
NO 2200! 800 proprobably
Explanation:
just did wrong
Answer:
800 kJ
Explanation:
The half-reaction at the cathode in an electrochemical cell is given below. What other half-reaction would most likely occur at the anode to produce a spontaneous reaction?
Ni^2(aq)+2e-=Ni(s)
A. Cu(s)=Cu^2+(aq)+2e-
B. Zn(s)=Zn^2+(aq)+2e-
C. Mg^2+(aq)+2e-=Mg(s)
D. Ni(s)=Ni^2+(aq)+2e-
The half-reaction is Zn → Zn⁺² + 2e⁻ which is most likely occur at the anode to produce a spontaneous reaction.
Hence, option (B) is correct answer.
What is Spontaneous Reaction ?A reaction which occurs without the intervention of outside is called Spontaneous reaction. The reaction is Spontaneous when the Δ G < 0 and [tex]E^{\circ}_{\text{cell}}[/tex] > 0.
What is Cathode and Anode ?Cathode where the reduction occurs. Anode where the oxidation take place.
Cathode: Ni⁺² + 2e⁻ → Ni
Anode: Zn → Zn⁺² + 2e⁻
______________________
Zn + Ni⁺² → Zn⁺² + Ni
The above reaction is spontaneous reaction.
Thus, from the above conclusion we can say that half-reaction is Zn → Zn⁺² + 2e⁻ which is most likely occur at the anode to produce a spontaneous reaction.
Hence, option (B) is correct answer.
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HCl + Fe?ra gì hihihihi
Answer:
fecl2+ h2
Explanation:
Es para hoy, ayuda por favor
Answer: it)s not letting me download it edit it a d re send it
Explanation:
(7) need help asappp plss
Answer:
See explanation
Explanation:
The cold drink chiller is a cold substance which is inserted into a bottle of drink which contains warm liquid particles at a particular temperature.
Once the drink chiller is inserted, the liquid molecules around the drink chiller become cooler, denser and sink away from the drink chiller. Other warmer, less dense molecules of the liquid drink now replaces them around the drink chiller.
A convection current is thus set up for as long as the drink chiller is working.
7. You have 1.5x1024 atoms of iron. How many moles do you have?
Answer:
2.49moles
Explanation:
To calculate the number of moles (n), of iron (Fe) in 1.5 × 10²⁴ atoms, we divide the number of atoms by Avogadro's number (6.02 × 10²³).
That is, n = N ÷ nA
Where;
n = number of moles (mol)
N = number of atoms
nA = Avogadro's constant
n = 1.5 × 10²⁴ ÷ 6.02 × 10²³
n = 1.5/6.02 × 10(²⁴ - ²³)
n = 0.249 × 10¹
n = 2.49moles
Use the periodic table to determine the electron configuration for aluminum (AI) and arsenic (As) in
noble-gas notation
AL
o [Ar]3s23p!
lo (He]2s22p63s23p!
0 [Ne]3s23p!
0 [Ne]3s23p2
DONE
Answer:
Aluminum; [Ne]3s²3p¹
Arsenic; [Ar]3d¹⁰4s²4p³
Explanation:
Aluminum
From the periodic table, we have that aluminum, Al, is located in period 3, and group 3A of the periodic table
Therefore, the noble gas that comes before aluminum in the periodic table is neon Ne
The electronic configuration of aluminum is 1s²2s²2p⁶3s²3p¹
The electronic configuration of neon is 1s²2s²2p⁶
Therefore, the electronic configuration of aluminum in noble gas notation (Ne) is therefore;
[Ne]3s²3p¹
Arsenic
Arsenic is located after argon, Ar on the periodic table
The electronic configuration of arsenic is 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p³
The electronic configuration of argon is 1s²2s²2p⁶3s²3p⁶
The electronic configuration of arsenic in noble gas notation (Ar) is given as follows;
[Ar]3d¹⁰4s²4p³
Need organic chemistry 11th grade
for practice and 1 question is enough :)
Answer:
ok all you need is a little study
Explanation:
organic chemistry isn't something to worry about is something that is a very simple concept if you understand what you're doing so a little bit of studying will help you go through it and you really don't this is not the topics that you will really understand if you just go through it as once so there is no need to worry about organic chemistry it is very simple concept just learning you are a you are close just learn all those simple aspects alkane etc it's very easy
los metales se oxidan
Which of the following equations is balanced?
(options in photo)
Answer:
Option (B)
Explanation:
Na2SO4 (aq) + CaCl2 (aq) → CaSO4 (s) + 2 NaCl (aq)
3 Cu + 8HNO3 → 3 Cu(NO3)2 + 2 NO + 4 H2O
In the above equation, how many grams of water can be made when 15.9 moles of HNO3 are consumed?
Answer:
45673
Explanation:
Please select the word from the list that best fits the definition
Flow of blood from the heart to the body tissues and back to the heart
Artery
Vein
Capillary
Systemic Circulation
Pulmonary Circulation
Answer:
Systemic Circulation
Explanation:
Answer:
Systemic Circuit
Systemic circulation carries oxygenated blood from the left ventricle, through the arteries, to the capillaries in the tissues of the body. From the tissue capillaries, the deoxygenated blood returns through a system of veins to the right atrium of the heart.Explanation:
I hope it's helpful for you ☺️Which reaction occurs at the cathode of a galvanic cell that has an aluminum electrode in an electrolyte with aluminum ions and copper electrode in an electrolyte with copper ions ? The reduction potential for the reduction of Cu^ 2+ = 0.34 The reduction potential for the reduction of AP^ 3+ =-1.68V.
Answer:
[tex]{ \bf{Cu {}^{2 + } + 2e \: → \: Cu }}[/tex]
The reaction that occurs at the cathode of a given galvanic cell is:
Cu²⁺ + 2e⁻ → Cu
What is Galvanic Cell?A galvanic cell can be defined as an electrochemical cell that converts the chemical energy of spontaneous redox reactions into electrical energy. The galvanic cell makes use of chemical reactions to generate electrical energy.
A galvanic cell consists of two half-cells and a salt bridge. Each half-cell further contains an electrode dipped into an electrolyte. When both electrodes are dipped in the same electrolyte, then there is no need for a salt bridge.
At the anode, an oxidation reaction occurs at this electrode. At the cathode, reduction occurs at this electrode. The anode has a negative potential with respect to the solution while the cathode has a positive potential with respect to the solution.
As in the question, the reduction of Cu²⁺ has a positive reduction potential. Therefore, the reduction of the copper will occur at the cathode.
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What are most likely the values of the quantum numbers I and mI for an
electron in a 3p orbital?
A. I = 1, 2, 3; mI = -1/2, + 1/2
B. I = 3; mI = -1/2, + 1/2
C. I = 0, 1, 2, 3; mI = -1, 0, 1
D. I = 1; mI = -1, 0, 1
Answer:
I think its D
Not too sure
The quantum numbers denote the position of an electron in the orbital. The angular momentum quantum number (l) and magnetic quantum number (ml) of the 3p orbital is I = 1; mI = -1, 0, 1. Thus, option D is correct.
What are quantum numbers?The quantum numbers are conserved quantities used to describe the energy and the position of the electron in the atomic orbital. The azimuthal, principal, magnetic, and spin are the four quantum numbers.
The angular momentum quantum number (l) represents the orbital shape and depends on the principal quantum number, n. The magnetic quantum number (ml) represents the orientation.
If an electron is in a 3p orbital then,
n = 3
l = 1
ml = -1, 0, 1
Therefore, option D. 3p orbital contains I = 1; mI = -1, 0, 1.
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What is the perimeter of a polygon 8cm 6cm, 4cm, 6cm
Answer:
24cm
Explanation:
The perimeter of a polygon is obtained by the sum of the length of each side of the figure.
The polygon of the problem has four sides with the following measurements:
8cm, 6cm, 4cm and 6cm.
That means the perimeter of this shape is:
8cm + 6cm + 4cm + 6cm =
24cmThe osmotic pressure of a solution formed by dissolving 0.231 g of the protein in 150 mL of water at 298 K is found to be 2.054 torr.
Answer:
13924g/mol is the molar mass of the protein
Explanation:
What is the molar mass of the protein.
The osmotic pressure of a solution, π, is defined as:
π = c*R*T
Where π is osmotic pressure = 2.054torr* (1atm/760torr) = 2.70x10⁻³atm
c is molar concentration of the protein,
R is gas constant = 0.082atmL/molK
And T is absolute temperature = 298K
Solving the molar concentration:
c = π / RT
c = 2.70x10⁻³atm / 0.082atmL/molK*298K
c = 1.106x10⁻⁴ moles protein / L
The moles of protein in 150mL = 0.150L:
0150L * (1.106x10⁻⁴ moles protein / L) = 1.659x10⁻⁵ moles protein
The molar mass is the ratio of mass and moles:
0.231g / 1.659x10⁻⁵ moles protein =
13924g/mol is the molar mass of the proteinHow would the equilibrium of the reaction below be affected if the temperature decreased?
Answer:
A. More O2, SO2, and SO3 would be produced.
Explanation:
Which of the following would DECREASE the rate of a reaction?
1. add a catalyst
2. increase the concentration
3. increase the volume
4. increase the pressure
Answer: increasing volume
Explanation: adding a catalyst would increase reaction time and increasing INCREASING concentration definently makes reaction time alot faster increasing pressure actually makes it more concentrated, so no it is not
can someone please explain core and valence electrons in periods for me please
Answer:
The electrons of an atom are typically divided into two categories: valence and core electrons. Valence electrons occupy the outermost shell or highest energy level of an atom while core electrons are those occupying the innermost shell or lowest energy levels
Explanation:
i hope u get it :))
specific rights related to freedom of expression
Answer:
beliefs, thoughts, ideas, and emotions
Explanation:
freedom of expression guarantees the freedom to express oneself without government censorship or media censorship.
How many atoms of phosphorus are in 7.00 mol of copper(II) phosphate?
Answer: The number of phosphorus atoms in given amount of copper(II) phosphate is [tex]8.431\times 10^{24}[/tex]
Explanation:
We are given:
Moles of copper(II) phosphate [tex]Cu_3(PO_4)_2[/tex] = 7.00 mol
1 mole of copper(II) phosphate contains 3 moles of copper, 2 moles of phosphorus and 8 moles of oxygen atoms
Moles of phosphorus in copper(II) phosphate = [tex](2\times 7.00mol[/tex]
According to the mole concept:
1 mole of a compound contains [tex]6.022\times 10^{23}[/tex] number of particles
So, 7.00 moles of copper(II) phosphate will contain = [tex](2\times 7\times 6.022\times 10^{23}=8.431\times 10^{24}[/tex] number of phosphorus atoms.
Hence, the number of phosphorus atoms in given amount of copper(II) phosphate is [tex]8.431\times 10^{24}[/tex]
What is the biggest earthquake danger to the people inside a building ?
Answer:
Most of the hazards to people come from man-made structures themselves and the shaking they receive from the earthquake. The real dangers to people are being crushed in a collapsing building, drowning in a flood caused by a broken dam or levee, getting buried under a landslide, or being burned in a fire.
Hope this helps :> <3
A cart accelerating slower when mass was increased.
1st Law - 3rd Law
Answer:
Newton's second law
Explanation:
It is mentioning acceleration and mass
Newton's second law's equation = F = m*a
Hope u understood
Please mark brainliest
Thank You
rank the intermolecular forces from weakest to strongest. Dipole-induced dipole, London dispersion, hydrogen bond, dipole-dipole
Answer:
London dispersion,hydrogen bond, dipole-dipole,dipole-induced dipole.
Explanation:
London dispersion < hydrogen bond < dipole-dipole < dipole-induced dipole.
What are intermolecular forces?Intermolecular forces are the forces which mediate an interaction between molecules, including forces of attraction or repulsion which act between molecules and other types of neighbouring particles.
The London dispersion force is a temporary attractive force that occurs when the electrons in two adjacent atoms make atoms form temporary dipoles.
A hydrogen bond is an intermolecular force that occurs with a special type of dipole-dipole attraction.
Dipole-dipole forces are the forces between the positive side of one polar molecule and the negative side of another polar molecule.
A dipole-induced dipole attraction is a weak attraction that occurs when a polar molecule produces a dipole in an atom or in a nonpolar molecule by arranging of electrons in the nonpolar species.
Hence intermolecular forces from weakest to strongest are:
London dispersion < hydrogen bond < dipole-dipole < dipole-induced dipole.
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Which statement is true for most autotrophic organisms?
A. They carry on extracellular digestion of nutrients before they ingest them.
B. They synthesize organic molecules from inorganic molecules.
C. They obtain organic molecules from heterotrophic organisms.
O O
D. They require no external energy source.
omg yees
eExplanation:
State with reasons, whether sulphur dioxide is acting as an oxidizing agent or a reducing agent in each of the following reactions:
•2H2S(g) + SO2(g) -> 2H2O(l) + 3S(s)
•SO2(g) +H2O(l) +NaClO(aq) -> NaCl(aq) + H2SO4(aq)
Answer:
A) oxidizing agent is SO2
B) NaClO is the oxidizing agent
Explanation:
A) This is a redox reaction in which oxidation and reduction occur simultaneously.
Thus, in 2H2S(g) + SO2(g) -> 2H2O(l) + 3S(s);
H2S is reduced as follows;
H2S → S + 2H+ + 2e−
We can see that SO2 has been reduced while H2S gets oxidized since it has changed state from - 2 to 0 . Thus sulphur dioxide is the oxidizing agent.
B) SO2(g) + H2O(l) + NaClO(aq) -> NaCl(aq) + H2SO4(aq)
In this, SO2 undergoes oxidation and NaClO is the oxidizing agent