Answer:
the modals of arrangement for first periodic table was. increasing atomic mass and grouping together of elements having similar properties
What did most of the particles that Rutherford shot at the gold foil do? What was the surprising behavior of a few of the particles? What did he determine?
Answer:
Explanation:
Rutherford gold experiment gave the explanation to some observations made on atoms.
When he shot the gold foil, most of the [tex]\alpha[/tex]-particles passes through the foil undeflected nor absorbed. This faction of the particles propagated the foil as if there was nothing placed on their path.
The surprising behavior of a few of the [tex]\alpha[/tex]-particles was that they were deflected from their initial path on hitting the gold foil.
This implies that there is a part of the gold foil which has the same charge as the [tex]\alpha[/tex]-particles, and more massive than the particles. Thus, he was able to determine the nucleus of an atom.
Review the electron configurations of the elements in period 3, from sodium (Na) to argon (Ar). What do you observe?
Answer:
Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom. The electrons are filled according to Afbau's rule in order of increasing energies.
[tex]Na:11:1s^22s^22p^63s^1 [/tex]
[tex]Mg:12:1s^22s^22p^63s^2[/tex]
[tex]Al:13:1s^22s^22p^63s^23p^1 [/tex]
[tex]Si:14:1s^22s^22p^63s^23p^2 [/tex]
[tex]P:15:1s^22s^22p^63s^23p^3 [/tex]
[tex]S:16:1s^22s^22p^63s^23p^4 [/tex]
[tex]Cl:17:1s^22s^22p^63s^23p^5 [/tex]
[tex]Ar:18:1s^22s^22p^63s^23p^6 [/tex]
The last electron enters the third shell in all elements from Sodium to Argon.
Answer: After the 3s sublevel is filled with two electrons, each additional electron goes into the 3p sublevel.
Explanation: plato/ edmentem answer
Analyze the energy associated with a phase change and provide an example of how energy is conserved.
1:The energy involved in a phase change depends on two major factors: the number and strength of bonds or force pairs. The number of bonds is proportional to the number of molecules and thus to the mass of the sample. The strength of forces depends on the type of molecules. The heat Q required to change the phase of a sample of mass m is given by
2:According to the law of conservation of energy, energy can neither be created nor destroyed but can be transformed from one form to another. Conversion of electric energy into sound energy is an example of the conservation of energy.
Explanation:
Hope it helps UvU
calculate the mass of a sample of cobalt containing 3.31x10^22 atoms
Answer:
Mass = 3.24 g
Explanation:
Given data:
Number of atoms of cobalt = 3.31 × 10²² atoms
Mass of cobalt atoms = ?
Solution:
We will calculate the number of moles of cobalt by using Avogadro number.
1 mole contain 6.022× 10²³ atoms
3.31 × 10²² atoms × 1 mol / 6.022× 10²³ atoms
0.549 mol × 10⁻¹
0.0549 mol
Mass of cobalt:
Mass = number of moles × molar mass
Mass = 0.0549 mol × 58.93 g/mol
Mass = 3.24 g
What was Bohr's model of the atom?
Answer:
In atomic physics, the Bohr model or Rutherford–Bohr model, presented by Niels Bohr and Ernest Rutherford in 1913, is a system consisting of a small, dense nucleus surrounded by orbiting electrons—similar to the structure of the Solar System, but with attraction provided by electrostatic forces in place of gravity.
Explanation:
Answer:
In atomic physics, the Bohr model or Rutherford–Bohr model, presented by Niels Bohr and Ernest Rutherford in 1913, is a system consisting of a small, dense nucleus surrounded by orbiting electrons—similar to the structure of the Solar System, but with attraction provided by electrostatic forces in place of gravity
How many Signifact figures does 0.000300
Answer:
3 significant digits
Explanation:
The first 0 don't count (that's the rule in significant digits). So 3,0,0 are left over. Count them and total will be 3 significant digits. (remember the last zero count if there is a decimal but the first zeros doesn't count even with the decimals)
A coin is flipped three times resulting in three heads. What is the probability that a fourth flip will be heads?
Answer:
1/4
Explanation:
The halogens are the elements of group 17 on the periodic table. Halogens combine easily with elements from group 1. When a halogen reacts with a metal, what type of compound is formed?
A.
potassium
B.
salt
C.
noble gas
D.
alloy
Answer:
it was salt just took it
Explanation:
Halogens are non metals and when a non metals reacts with metals they form an ionic compound by gaining electrons from the metal.
What are ionic compounds?Ionic compounds are formed by electron loss/gain between two atoms. Ionic bond is the strongest type of bond. Ionic bond is formed between metals and nonmetals.
Metals are electron rich and they are electropositive in nature. They lose one more electron when reacted with nonmetals. Nonmetals which are electronegative will gain electron from the metals and form the ionic bond.
Halogens such chlorine, bromine etc are highly electronegative and they form ionic compounds of metals such as sodium, potassium, magnesium etc by losing gaining one electron from the metal. Therefore, when halogens reacts with metals forming ionic compounds.
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What is the gram atomic mass of lithium?
Answer:
It is 7 g in accordance to the periodic table
The size of atoms can be measured using the diffraction of x-rays. Measurements of atomic size confirm that trends can be identified based on location on the Periodic Table of the Elements. Which group of elements is listed in order of decreasing size?
(A.) iodine, bromine, chlorine, Zinc
(B.) boron, carbon, nitrogen, oxygen
(C.) sodium, potassium, rubidium, cesium
(D.) phosphorous, selenium, iodine, radon
Answer:B is the answer I thinn
Explanation:I think !!
1) What are renewable energy sources?
Resources that will never run out.
W
Resources that will run out eventually.
They are new resources we have never used before.
O What is a resource?
"The incredible diversity of pterosaurs is perhaps best expressed in one of the
prehistoric flying reptile's most intriguing and mysterious features: the head crest."
What evidence from the text supports the idea that the diversity of pterosaurs is best
expressed in their head crests?
A "Many pterosaurs had flesh-and-bone crests atop their skulls - dramatic
anatomical characteristics whose purpose is still debated by paleontologists."
B "Akin to a rooster's comb, peacock's crown, or the frill on some lizards!
necks, pterosaur crests were prominent anatomical features found across many
species."
C "Pterosaurs crests are thought to have been fairly ubiquitous, appearing in
many groups of pterosaurs from the Triassic (252-201 million years ago)
through the Jurassic (201–145 million years ago) and Cretaceous (145-66
million years ago) periods."
D "Among pterosaur species known to have had crests, there is an amazing
range of shapes and sizes."
Answer:
b
Explanation:
what is elastic force
Answer:
Something that is elastic can return to its original shape after being stretched or compressed. As you stretch or compress an elastic material like a bungee cord or a rubber band it resists the change in shape. It exerts a counterforce in the opposite direction. Now if you pull back the rubber band u are using force now if you let go the force that you used to pull back is transferred into the band snapping and bouncing. This force is called an elastic force.
Answer:
it is something that will return back to shape and being stretched or compressed
2. A chemical formula that shows the actual # and kinds of atoms present in one molecule of a compound is called
O A. ionic formula
O B. empirical formula
O C. molecular formula
Question 1
What causes a thermocline?
a decline in the amount of nutrients available
a difference in water temperature
the absence of plankton
nutrients too heavy to rise to the surface
Question 2
Which organism is a kind of phytoplankton?
algae
sea butterfly
copepod
lion’s mane jellyfish
please help!! and try and answer them all, not just one!
Answer:
1) The Difference in water tempture
2) Algae
Explanation:
Have a good day! ∩__∩
Answer:
question 1. thermocline is caused by a difference in water temperature.
question 2. a kind of phytoplankton is algae
The measure of angle BAC can be cakulated using the
3,1
What is the measure of angle BAC? Round to the
nearest whole degree.
0°
С
1°
44
A
3.1 in
48°
4.5 in
B
[Not drawn to scale]
By the use of the trigonometric ratios, we have obtained the angle BAC as 44 degrees.
What is a right angled triangle?A right angled triangle is one in which one of the sides of the triangle is at an angle of 90 degrees. We are told to first find x knowing that;
x = sin^-1( 3.1/4.5) = 44 degrees
We can see that by the use of the trigonometric ratios, we have obtained the angle BAC as 44 degrees.
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I need help !!!!!!!!!!!!!!!!!!!!!!!!!
Answer:1&4?
Explanation:
Given the empirical formula of your compound is CH₂, what is the gram formula mass of the empirical formula?
Answer:
14g
Explanation:
The empirical formula of the compound is CH₂ ;
When we are dealing with compounds the gram formula mass or gram - molecular weight is the molar mass of the compound.
It is determined by adding the atomic masses of the components together and then expressed in grams.
Atomic mass of C = 12
Atomic mass of H = 1
Gram formula mass = 12 + 2(1) = 14g
What is the molar mass of Fe2O3? (with units)
Answer:
159.7 g/mol
Explanation:
The molar mass of Fe2O3 is 159.7 g/mol.
What is Mg(HSO3)2????
Answer:
Mg(HSO3)2 is Magnesium bicarbonate.
Answer:
Mg(HSO3)2: Magnesium Hydrogen Sulfite
Explanation:
What is NaCI and what is KBr?
my mom is yelling at me Bc of all my missing assignments Ik that’s a me problem but pls help me
Pls
If there are only two atoms in a molecule, what would make it nonpolar?
Answer:
In general, if the electronegativity difference between two atoms is less than 0.5, the bond is considered nonpolar, even though the only truly nonpolar molecules are those formed with identical atoms. Nonpolar molecules also form when atoms sharing a polar bond arrange such that the electric charges cancel each other out.
Explanation:
sorry if I'm wrong or if this doesn't help you
A young deer needs cell division to grow to its full size. However, a deer's cells continue to divide through its whole life. Why do an adult deer's cells
continue to divide? Choose the two statements that apply.
A Cell division prevents cancer.
B. Cell division improves the deer's memory.
C. Cell division repairs damage from injuries.
D
Cell division replaces old or diseased cells
U
E Cell division helps the deer eliminate wastes.
Answer:
D :)
Explanation:
Cells die and the new cells that are being produced are replaced by new living cells. (If cell division prevented cancer, we'd all be saved by now.)
Cell division is carried to produce new identical cells to during reproduction as well to replace old and diseased cells. Thus option C is correct.
What is cell division.Cell division is the process of multiplication of a cell into two identical daughter cells. Cell division is taking place in all living organism by which they reproduce and repair cells.
Cell division takes places through several stages namely, interphase, telophase etc. There are different methods of cell division such as mitosis, meiosis, binary fission etc.
Different level of organisms follows different methods for cell division. In eukaryotes, mitosis takes place where genetically identical daughter cells are produced. It is called vegetative division.
In reproductive cell division the number of chromosomes will be reduced in daughter cell to half or that in parent cells. Thus in a cell cycle , the odl cells are replaced by new cells and identical offsprings are created by cell division. Hence, option C is correct.
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Krypton is named after the Greek word that means “secret.” Which explains why krypton was most likely given this name?
Krypton is a halogen, so it is a secret element because it is always part of a compound and is difficult to find by itself.
Krypton is a halogen, so it should be kept secret because it is so reactive and toxic.
Krypton is a noble gas, so it was difficult for chemists to find it, as though it was a secret.
Krypton is a noble gas, so it secretly bonds with every type of element without showing it
Answer:
C) Krypton is a noble gas, so it was difficult for chemists to find it, as though it was a secret.
Explanation:
Answer:
C
Explanation:
How many moles of magnesium nitrate are produced from 143.2 grams of nitric acid, HNO3?
2HNO3 + Mg(OH)2 = Mg(NO3)2 + 2H2O
Answer:
1.14 mol
Explanation:
Given data:
Mass of HNO₃ react = 143.2 g
Moles of Mg(NO₃)₂ produced = ?
Solution:
Chemical equation:
2HNO₃ + Mg(OH)₂ → Mg(NO₃)₂ + 2H₂O
Number of moles of HNO₃:
Number of moles = mass/molar mass
Number of moles = 143.2 g/ 63.01 g/mol
Number of moles = 2.273 mol
Now we will compare the moles of HNO₃ and Mg(NO₃)₂
HNO₃ : Mg(NO₃)₂
2 : 1
2.273 : 1/2×2.273 = 1.14 mol
In the laboratory, Austin is given a mixture of iron filings, sand, and salt. To separate the mixture, Austin uses a magnet, boiling water, and a
filter. Which statement is true about the process Austin uses to separate this mixture?
A. Austin uses only physical changes to separate the
mixture's components.
B. Austin uses only chemical changes to separate the mixture's components.
C. Austin uses both physical and chemical changes to separate the mixture's components.
D. Austin uses neither physical nor chemical changes to separate the mixture's components.
Answer:
d
Explanation:
The statement that is true about the process Austin uses to separate this mixture is that Austin uses neither physical nor chemical changes to separate the mixture's components. The correct option is D.
What is a laboratory?A laboratory is a place with carefully regulated circumstances where experiments, measurements, and scientific or technological research can be done.
Here, Austin is separating a mixture in the laboratory. Now, iron is attracted to the magnet, and sand and salt are not attracted to the magnet. So these will be separated by the magnetic property of the iron. It is a physical property of a substance that matters in this separation.
Thus, the correct option is D. Austin uses neither physical nor chemical changes to separate the mixture's components.
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What is the mass of 1.45 moles of silver sulfate?
Answer:
449.5 g
Explanation:
Silver sulfate- Ag2SO4
M(Ag)=107 g/mol => M(Ag2)=214 g/mol
M(S)=32 g/mol
M(O)=16 g/mol => M(O4)=64 g/mol
M(Ag2SO4)=310 g/mol
n=1.45 mol
m(Ag2SO4)=M(Ag2SO4)*n=310 g/mol *1.45 mol= 449.5 g
what are the 9 properties of minerals and explain each property?
Answer:
hardness-Hardness is the ability of a material to resist deformation
luster-the way light interacts with the surface of a crystal
color-the quality of an object or substance with respect to light reflected by the object
streak- the color of the powder produced when it is dragged across an un-weathered surface.
specif gravity-the density of that object divided by the density of water cleavage -the tendency of a mineral to break along smooth planes
fracture-any separation in a geologic formation
tenacity-refers to a mineral's toughness or resistance to breaking or being deformed.
lol sorry that took awhile
explain the difference between positive and negative acceleration
Answer:
Difference between Positive and negative acceleration is that in positive acceleration velocity of a body increases with time, and negative acceleration velocity of a body decreases with the increasing of time.
Explanation:
