The atomic mass of lead : 207 g/mol
Further explanationThe mass of this basic particle is expressed in atomic mass units
This atomic unit uses the standard atomic mass, that is, the C-12 isotope
1 atom C-12 = 12 atomic mass units
The atomic mass of an element (amu = u = g/mol) = the mass in grams of one mole of an element.
The mass of 0.2 mol of Lead equals 41.4 grams, so the atomic mass :
[tex]\tt \dfrac{41.4}{0.2}=207~g/mol[/tex]
CC14
Which of the following elements would most likely form an ionic
compound?
*
Ca and Ni
Cu and Ar
F and S
Na and Cl
Answer:
Na and Cl
Explanation:
An ionic compound is solid at state room temperature. Therefore Na and Cl would be the correct answer :)
The octet rule states that the formula for a compound is derived by Group of answer choices having a net charge of magnitude 8. using a minimum of 8 atoms. using exactly 8 bonds in the formula unit. having all atoms or ions get noble gas electron configurations.
Answer:
Atoms bonds with 8 electrons
Explanation:
Octet rule is a chemical rule that shows elements in main group bond so that each atom have 8 valence electrons in the outmost shell which make them to have similar electronic configuration with Noble gases This is important because the sharing of electrons make atoms to have full shell. Atoms with electrons not up to 8 react with more stable compound.
A fish swimming in water uses its fins to push the water backward, making 2 points
it swim forward. This is an example of Newton's
law of motion. *
Answer:
Newton's third law
Explanation:
A fish swimming uses its fins to push the water backward making it swim forward is obeying Newton's third law of motion.
Newton's third law of motion states that "action and reaction are equal and opposite".
When the fish uses its fin to push the water backward, it reacts by being propelled in the opposite direction which is in the forward sense.
The third law is clear indicator that forces are always in pairs. As the fish swims, a net force between the oppositely directed forces do not cancel out.
How many electrons does the Lewis structure for phosphorus trifluoride have?
Answer:
In the Lewis structure for PF3 there are a total of 26 valence electrons. Three pairs will be used in the chemical bonds between the P and F.
Explanation:
covalent compound formula for hydrogen monochloride
Answer:
HCl
Explanation:
1 hydrogen 1 chlorine
Look at the periodic table in number 1. Boron (B), Aluminum (Al), Silicon (Si), Germanium (Ge), Arsenic(As), what can be said about these elements that border the zigzag line on the table? They are _____________ *
A.) Noble Gases
B.) Metals
C.) Nonmetals
D.) Metalloids
Answer: Metalloids
Explanation:
Which is a unit of volume?
(A). Centimeter
(B). Meter
(C). Milligram
(D). Millitliter
A reaction mixture is at equilibrium. What happens when the product is withdrawn out of the reaction mixture?
When a reaction is in equilibrium, and the product is removed, the equilibrium shifts to the right, towards the product.
What is equilibrium in a reaction?Equilibrium is a stage, when there is no change in the mass and energy of the reaction.
When more reactant added in the equilibrium stage, the equilibrium shifts toward the left, and when product added the equilibrium shifts towards the right, product.
Thus, When a reaction is in equilibrium, and the product is removed, the equilibrium shifts to the right, towards the product.
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True or false during reactions or light is needed carbon dioxide is converted to glucose
Answer:
True
Explanation:
Which bond has one sigma and two pi bonds?
a
b
c
Answer:
It is letter B.
Explanation:
believe my answer cause I answered this kind of question in ny exam
schroedinger thought that electrons
Answer:
In Niels Bohr's theory of the atom, electrons absorb and emit radiation of fixed wavelengths when jumping between fixed orbits around a nucleus. The theory provided a good description of the spectrum created by the hydrogen atom, but needed to be developed to suit more complicated atoms and molecules.
Explanation:
how many electrons in an atom with the electron configuration of 1s2 2s2 2p6 3s1
Taking into account the definition of electronic configuration and the Aufbau principle, in an atom with the electron configuration of 1s²2s²2p⁶3s¹, there are 11 electrons.
Electronic configurationThe electronic configuration of elements is the arrangement of all the electrons of an element in energy levels and sublevels (orbitals).
There are 7 energy levels, numbered from 1 to 7, and in which the electrons are distributed, logically, in order according to their energy level. Electrons with less energy will spin at level 1.
Each level is divided into sublevels. These sublevels into which each level is divided can be up to 4. These 4 sublevels are called: s, p, d, f.
In the s sublevel there can only be a maximum of 2 electrons, in p there can be a maximum of 6 electrons, in the d sublevel 10 electrons and finally in the f sublevel there can be a maximum of 14 electrons.
At level 1 there is only one sublevel, which will be the s. In level 2 there are 2 sublevels, the s and the p. At level 3 there are 3 sublevels s, p and d. And in level 4 there are 4 sublevels, the s, the p, the d and the f.
Aufbau's principleThe Aufbau principle is a principle of atomic physics, which explains how electrons arrange themselves in their orbits around the nucleus of the atom.
This principle states that the filling of these orbitals occurs in order of increasing energy, that is, from orbitals of lower energy to those of higher energy.
The simplest of the sublevels is 1. If you fill the 1s, you can start filling the 2s. Once the 2s sublevel is satisfied, the 2p can start filling, and so on.
Amount of electronsIn this case, in an atom with the electron configuration of 1s²2s²2p⁶3s¹, there are 2+2+6+1= 11 electrons.
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Which element below would have a 3+ charge as an ion?
Answer:
Al3+
Explanation:
Aluminium has an electronic configuration of 2, 8, 3 and the outermost valence electrons is +3 since it is a metal
Elements acquire positive or negative charges by losing or gaining electrons. The element which have 3+ charge among the options is boron (B) Hence, option B is correct.
What is boron?Boron is 5th element in periodic table and it is classified into 13th group. Boron is a metalloid and shows properties intermediate to metals and non metals.
The electronic configuration of boron is K =2, N =3. Atoms lose or gain electrons as per their valency to become stable. According to octet rule atoms become stable when their valence shell get completely filled.
Boron have 3 electrons in its valence shell. If it donate these three electrons into an electronegative atom, its K shell become its valence shell and it is completely filled. Thus boron becomes stable.]
When atoms loses electrons they acquire positive charge and this charge is numerically equal to the number of electrons lost. Thus boron acquire 3 unit of positive charge by donating its 3 electrons. Hence, option B is correct.
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Your question is incomplete. But your complete question probably was :
Which element below would have a 3+ charge as an ion?
answer choices.
nitrogen (N).
boron (B).
silicon (Si).
argon (Ar)
can the average speed ever be zero?
PLEAZ HELP!! DUE IN 20!!!
What is some of the evidence used by Galileo to support Capricorns model and disapprove Aristotle's and Ptolemys
Answer:
Over time he discovered that the Moon-like phases of Venus demonstrated that the neighboring planet had an orbit independent of Earth. This showed conclusively that Venus circled the Sun, as Copernicus thought, not Earth, as Ptolemy thought. But it did not yet prove conclusively that Earth circled the Sun.
Answer: Option #3 or C. Jupiter has moons orbiting it.
Explanation: Galieo found moons of Jupiter, conflicting with teachings of Aristotle and Ptolemy.
So the correct answer is option # 3 or C. Did it on Edge got it right! :)
Question: What is some of the evidence used by Galileo to support Copernicus’s model and disprove Aristotle and Ptolemy’s?
Options Given:
A. Each planet spins in an epicycle.
B. Planets appear to move backward.
C. Jupiter has moons orbiting it.
D. The religious and cultural beliefs supported this model.
What are the trends for atomic size and ionization? Explain why for each trend. Tell me the direction- up or down a group and across a period for each trend. Use the lecture, the video at the end of the lecture, or the guide for periodic trends to respond to this prompt.
Answer:
See explanation
Explanation:
Atomic size increases down the group due to the addition of more shells.
As more shells are added and repulsion of inner electrons become more significant, atomic size increases down the group. However, across the period, atomic size decreases due to increase in effective nuclear charge without any increase in the number of shells. This causes increased attraction between the nucleus and the outermost shell thereby decreasing the size of the atom.
Ionization energy decreases down the group because the outermost electron is more shielded by inner electrons making it easier for this outermost electron to be lost. Across the period, ionization energy increases due to increase in effective nuclear charge which makes it more difficult to remove the outermost electron due to increased nuclear attraction.
SOMEONE HELP I FEEL LIKE IM RIGHT AM I???
Hi.
Please i need help with these questions.
Please show workings.
Answer:
see the pict for the answers
1. Lithium, water, edible salt, chalk, Carbon, Lime, Nitrogen, Potassium, Oxygen,
Iodides, Iron, Chlorine, etc are some matters.
(a) Among the mentioned matters in the stem which one is called the Universal
Solvent? – Analyze the cause. 5 marks
Answer:
Explanation:
Water is called the "universal solvent" because it is capable of dissolving more substances than any other liquidIt is water's chemical composition and physical attributes that make it such an excellent solvent. Water molecules have a polar arrangement of oxygen and hydrogen atoms—one side (hydrogen) has a positive electrical charge and the other side (oxygen) had a negative charge. This allows the water molecule to become attracted to many other different types of molecules. Water can become so heavily attracted to a different compound, like salt (NaCl), that it can disrupt the attractive forces that hold the sodium and chloride in the salt compound together and, thus, dissolve it.
What are some chemical changes in hydrogen?
Hydrogen changes from a gas to a liquid at a temperature of -252.77°C (-422.99°F) and from a liquid to a solid at a temperature of -259.2°C (-434.6°F). It is slightly soluble in water, alcohol, and a few other common liquids.
Which of the following can best be described as speed plus direction?A: AccelerationB: DecelerationC: FrictionD: Velocity
Answer:
D
Explanation:
Because speed is a scalar quantity which he has only magnitude and no direction while velocity is a vector quantity because it has both magnitude and direction.
Why is it important for a community to have many different organism living together?
Answer:
Individual organisms live together in an ecosystem and depend on one another. In fact, they have many different types of interactions with each other, and many of these interactions are critical for their survival. ... One category of interactions describes the different ways organisms obtain their food and energy.
HCl + Ca(OH)2 --->
and why?
Answer:
CaCl2 + H2O
Explanation:
Why does the salt reappear when the water evaporates??
Answer:
Salt particles move about the water. Each particle is surrounded by water molecules.The water particles (molecules) keep the salt particles from rearranging themselves back into a salt crystal. Salt particles are carried throughout the solution surrounded by water particles.
As the water evaporates less and less water molecules are present to keep the salt particles apart. The salt therefore recrystalises and can be collected.
Explanation:
Hope this helped!
-B
Why are most metals malleable and ductile?
Answer:
Most metals are malleable and ductile because of the ability of the atoms to roll over each other into new positions without breaking the metallic bond.
Answer:
Look below:
Explanation:
This is because their atoms can roll over each other into new positions without breaking the metallic bonds.
what is a true statement about the atom's nucleus?
Which equation describes a reduction?
A- Upper M g (s) right arrow Uper M g superscript 2 plus (a q) plus 2 e superscript minus.
B- 2 upper C l plus 2 e superscript minus right arrow 2 upper C l superscript minus.
C- Upper N a (s) right arrow upper N a superscript plus (a q) plus e superscript minus.
D- Upper A l (s) right arrow upper A l superscript 3 plus (a q) plus 3 e superscript minus.
Answer:
b
Explanation:
Reduction is the process of gaining of electron. The equation that describes a reduction is option b, Cl reduces Cl- by accepting an electron.
What is reduction ?Reduction is the process of reaction with hydrogen or accepting one or more electrons. In reduction, a species reduces to its lower oxidation state. The process of losing electron is called oxidation. Elements forms their higher oxidation states in oxidation state.
Mg metal loses its two electron giving Mg²⁺ , Na metal loses its one electron giving Na+ are all oxidation. Similarly Al metal giving Al³⁺ ions is oxidation.
Atoms when gain electron, they acquire negative charges. Cl have 7 valence electrons and it need one more electron to achieve octet. Hence it gains an electron forming its lower oxidation state Cl⁻. Here, oxidation state decreases from 0 to -1.
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In the image below, the truck and bus have the same mass and are
traveling at the same speed. Which of these statements accurately
explains their energies? *
A) They have the same gravitational potential energy but have different kinetic
energies
B) They have the same kinetic energy but different gravitational potential energies.
C) The truck has more kinetic energy than the bus.
D) The truck has more gravitational potential energy than the bus
Answer:
B)They have the same kinetic energy but different gravitational potential energies.
Explanation:
I don't know the exact explanation but I just took the test.
If you have a bottle with Helium & Nitrogen at room temperature, how do the speed of the particles compare?
Answer:
The Helium particles will be faster than the Nitrogen particles
Explanation:
This is because the particles of both elements have the same average kinetic energy (they are at the same temperature), but Nitrogen atoms are heavier than Helium atoms, and therefore they move slower in accordance to Newton's second law of motion, f=ma. The larger massed Nitrogen atoms take more energy to move so they are slower because both particles have the same energy.
2 examples of foods fermented by yeast
