Answer: 4s orbital contains the electron that calcium loses to form an ion
Explanation:
Electronic configuration represents the total number of electrons that a neutral element contains. The electrons are filled according to Afbau's rule in order of increasing energies.
Calcium with atomic number 20 has 20 electrons and has 2 valence electrons which it can lose to for stable [tex]Ca^{2+}[/tex] ion. The valence elctrons are present in valence shell i.e. 4s.
[tex]Ca:20:1s^22s^22p^63s^23p^64s^2[/tex]
[tex]Ca^{2+}:18:1s^22s^22p^63s^23p^64s^0[/tex]
How can you find out what substances
Answer: Melting or boiling
Explanation:
Melting or boiling point is another property that scientists can use to identify a substance. Melting point is the temperature at which a substance changes from solid → liquid. Boiling point is the temperature at which a substance changes from liquid → gas.
Which statement best describes what is happening when water is thrown on a wood fire?
The water transforms the thermal energy to chemical energy.
The water causes a chemical change of the wood which reduces the fire.
The water releases its thermal energy to the fire.
The water absorbs the thermal energy of the fire.
Again, don't answer if you don't know.
Answer:
The water absorbs the thermal energy of the fire.
Explanation:
Thermal energy a form of energy that is produced when a rise in temperature causes atoms and molecules to move faster and collide with each other. It is a form of energy which involves the transfer of energy from regions of higher heat content to regions of lower heat content.
A burning wood fire has a higher heat content than water. Therefore, when water is thrown on a wood fire, the water will absorb the heat from the burning wood fire in order to raise its own heat content. since the wood fire has lost heat to water, it would eventually stop burning, whereas the water whose heat content has been raised may have some of its molecules absorbing so much heat that a change of phase occurs to the liquid phase.
Predict the missing particle or nuclide.
239 Np -> 239 Pu + ?
93 94
Select one:
a. alpha emission
b. beta migus emission
c. positron emission
Answer:
beta minus emission
Explanation:
Beta radiations:
Beta radiations are result from the beta decay in which electron is ejected. The neutron inside of the nucleus converted into the proton an thus emit the electron which is called β particle.
The mass of beta particle is smaller than the alpha particles.
They can travel in air in few meter distance.
These radiations can penetrate into the human skin.
The sheet of aluminum is used to block the beta radiation
²³⁹₉₃Np→ ²³⁹₉₄Pu + ⁰₋₁e
The beta radiations are emitted in this reaction. The one electron is ejected and neutron is converted into proton.
The crystal lattice is a three-dimensional structure.
O True
O False
Answer:
True
Three-Dimensional Lattice
The unique arrangement of atoms or molecules within a crystalline solid is referred to as the crystal structure of that material. ... The crystal lattice represents the three-dimensional structure of the crystal's atomic/molecular components.
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J.J. Thomson's model of the atom includes all BUT ONE of these features. That is
es )
A)
electrons radiated throughout the positive sphere.
B)
an atom contains both positive and negative charges
C)
the positive atomic charge is spherically distributed.
D)
electrons revolved around the positive nuclear sphere.
Answer:
D
Explanation:
usa testprep!!!!!
Dalton incorporated the law of conservation of mass into his atomic theory by asserting that
Answer:
a. atoms are indivisible. ... atoms can not be destroyed in chemical reactions.
Explanation:
Hope this helped :D
true or false an object's weight is a force that depends on gravity
Answer:
True
I studied science physics pls mark me brainliest thanks
Answer:
true
Explanation:
Weight is calculated accounting for gravity, which is why a person weighs less on the moon than on Earth.
HTH :)
Which diagram demonstrates active transport?
a. A
b. B
C.
C
d. None of the above
Answer:
c
Explanation:
Diagram C represents active transport which is a type of facilitated diffusion.
What is diffusion?
Diffusion is defined as the process of movement of molecules which takes place under concentration gradient. It helps in movement of substances in and out from the cell.The molecules move from lower concentration region to a higher concentration region till the concentration becomes equal.
There are 2 main types of diffusion:
1) simple diffusion-process in which substances move through a semi-permeable membrane without the aid of transport proteins.
2) facilitated diffusion- It is a passive movement of molecules across cell membrane from higher concentration region to lower concentration.
There are 2 types of facilitated diffusion one is osmosis and dialysis.
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If the wavelength of light will cause electrons to be removed from the metal (creating the photoelectric effect). What is the effect of doubling the photon flux of light?
Answer:
The number of photoelectrons are increased
Explanation:
According to Albert Einstein, when light falls on a clean metal surface, electrons are ejected from the clean metal surface. This is known as photo electric effect.
The kinetic energy of the emitted photoelectron depends on the energy of the incident photon and the work function of the metal. If the energy of the incident photon is less than the work function of the metal, photoelectric effect does not occur.
Below a given threshold frequency or wavelength called the threshold frequency or threshold wavelength photoelectric effect does not occur.
However, doubling the photon flux of light doubles the intensity of the light. This only leads to increase in the number of photons and have nothing to do with the energy of the emitted photoelectrons.
Which type of of star cluster is loose and disorganized? A. binary B. eclipse C. globular or D. open.
Answer:
Open cluster
Explanation:
Why should I explain?
Answer: D open cluster
Explanation:
4. Describe the landforms created at a subducting plate boundary and those created
at a convergent plate boundary between two continental plates. Explain why the
landforms are different.
Answer:Plate Tectonics : Different Plate Boundaries Create Different Landforms and ... Plate Boundary: CONVERGENT ... As the MORE DENSE oceanic plate (OP) subducts under ... Illustration of what is happening ... Two continental plates (CP) move away from each other ... Sea Floor spreading occurs at these mid-ocean ridges.
Explanation:
The landforms created in the subducting plate boundary are mid ocean ridges, fold mountains and islands. Volcanoes and earth quakes are common in these regions.
What is convergent boundary?Plate boundaries are regions of intersections between two tectonic plates. There are three different type of plate boundaries, namely convergent boundaries, divergent boundaries and transform boundaries.
In convergent plate boundaries, two tectonic plates moves close to each other and converge. These plate boundaries gives rise to different types of land forms such as fold mountains, islands etc.
Earthquakes and volcanoes are common in convergent plate boundaries. These type of plate movement is caused by the convection currents in the mantle.
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Which describes a step in the process of forming an ionic bond?
A metal atom loses electrons and becomes a positive ion.
A metal atom gains electrons and becomes a negative ion.
A nonmetal atom loses electrons and becomes a negative ion.
A nonmetal atom gains electrons and becomes a positive ion.
Answer:a metal loses electrons and becomes a positive ion
Explanation:
The answer option which describes a step in the process of formation of an ionic bond is: A. A metal atom loses electrons and becomes a positive ion.
In Chemistry, the three (3) fundamental types of chemical bonds are:
Hydrogen bondsCovalent bondsIonic bondsAn ionic bond can be defined as a type of chemical bond which involves a metallic element transferring one or more electrons to a non-metallic element, in order to become a positive ion.
This ultimately implies that, the formation of an ionic bond typically involves a metal atom losing its electrons to a non-metallic element, in order to become a positive ion.
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Witch type of force is a contact force
A-strong nuclear force
B-gravity
C-friction
D-electromagnetic force
Answer: D
Explanation:
Answer:
C. Friction
Explanation:
Because friction needs contact to occur, the other forces do not require contact like friction does.
What is the atomic number for 1s2,2s2,2p6,3s1
Answer: the atomic number is 11
Explanation: using a electron configuration chart you can see that 3s1 stops on Na which is 11 on the table
1.what PROCESS describes the water moving through a membrane?
2.water flows across a cell membrane from where it is-
Answer:
Osmosis is the process that describes water moving through a membrane.
I am not sure about the second question.
Explanation:
_________are horizontal rows on the Periodic Table.
Help me is due tomorrow
what material is a pure substsane
Answer:
salt, sugar, and so on.
Explanation:
A pure substance is a material that has a constant composition, and has the same properties throughout the sample. pure substances in chemical equations form predictable products. In chemistry, a pure substance has only one type of atom , molecule, or compound.
Which of the following best describes the difference between the mass of a balloon and the mass of a bowling ball?
Answer:
Explanation:m
At 1 atm and 300 K, this gives n/V = 0.0406 mol/l. For air, which has a molar mass of 29.0 g/mol, this gives a density of 1.18 g/l. Helium, which has a mass of 4.00 g/mol, has a density of 0.164 g/l. Thus, a one-liter balloon of helium can lift a mass of (1.18-0.164) = 1.02 g. In science, the standard unit of mass is the kilogram (kg). A bowling ball has a mass of about 5 kilograms. Bowling ball weights range from 6 lbs. To 16 lbs. in most cases males will use weights ranging between 12 lbs. and 16 lbs. You might calculate volume using the sphere's radius, circumference or diameter. You can also submerge the sphere in water to find its volume by displacement. Once you know the volume, you can multiply by the density to find the mass.
Hope That Helps
is this Ionic, Covalent, or Metallic?
Answer:
Covalent
General Formulas and Concepts:
Chemistry - Compounds
Ionic Bonds - Forming between a metal and nonmetal Covalent Bonds - Forming between 2 nonmetals Metallic Bonds - Forming between 2 metalsExplanation:
Step 1: Define
NCl₃ - Nitrogen Trichloride
Step 2: Identify
Nitrogen is a nonmetal
Chlorine is a Halogen Gas
Step 3: Confirm
Nitrogen and the 3 Chlorines will have to share electrons and form a Covalent bond.
Answer:
The bond is ionic.
Explanation:
If a nonmetal and a metal bond, it's known as a characteristic of an ionic bond.
The answer above is false, Google "Is nitrogen trichloride an ionic compound" in order to find out why.
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Temperature is a(n)
ecosystem.
component of an ecosystem.
Answer:
Temperature is an abiotic component of an ecosystem
Explanation:
Why are 99.9% of metals (pure) way more expensive than 95% metals?
Answer:
A pure metal is any metal that has not been joined with any other metal
Explanation:
Answer:
Be cause of The fat
Explanation:
It’s just fat
Help question in picture
—————-
Answer:
Ca=2,8,8,2
Ne=2,8
S=2,8,6
Explanation:
bc Ca valance no is 20
Ne """""""""""""""""10
S """""”"""""""""* 16
several different amino acids join together to form a protein. how do any two types of amino acids differ from one another?
Answer:
It all really depends on the side group the amino acid is on! For instance, out of the 20 side groups used to make proteins, there are only two main groups: polar and non-polar
Choose all the correct answers.
The Jovian planets include:
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
Choose all the correct answers.
The terrestrial planets include:
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
Answer both please
which of the following is a property of a pure substance
Answer:
something with one particle/atom
Explanation:
The relationship between an object's mass (m), its acceleration (a), and the applied force (F) is described in which of Newton's Laws?
A:First Law
B:Second Law
C:Third Law
Answer: so the answer is A
Explanation: The relationship between an object's mass (m), its acceleration (a), and the applied force (f) is F=ma. ... This law requires that the direction of the acceleration vector is in the same direction as the force vectors.
How do S waves move through the earth?
A. S waves move the fastest
B. S waves move parallel to the force applied
C. S waves move perpendicular to the force applied
D. S waves move in every possible direction
Answer:
I believe that its B
Explanation:
google lol
Please help ASAP
Calculate the acceleration of this object. Remember, acceleration = net force / mass
Question 4 options:
1.7 m/s2
17,000 m/s2
2.3 m/s2
2 m/s2
Answer:
I’ll put the answer the comments if you can give the actual question
Explanation:
True or false Different types of atoms can bond together to make molecules
Answer:
true
Explanation:
because if you really take a moment to think about it atoms are made of molecules.
HELP!! An unknown solution has a pH reading of 8.4. Which statement is true about this solution?
A. The solution is a strong acid.
B. The solution is a strong base.
C. The solution is a weak acid.
D. The solution is a weak base.
Answer:
D- a weak base
Explanation:
The ph scale goes from 1-10 a solution over 7ph is classified as basic. A solution thats 8.4 is only 1.4 over 7pH, making it a weak basic solution. An example of a strong base would be a solution with a pH of 9.2 (for example).
Answer:
D.) The solution is a weak base
Explanation:
I got it correct on founders education