Answer:
See explanation
Explanation:
The valence shell electron pair repulsion theory holds that the number of electron pairs on the outermost shell of the central atom in a molecule determines the shape of the molecule.
In accordance with this theory, the electron domain geometry of a molecule having 4 outer atoms and 2 lone pairs on the central atom is based on an octahedron. The molecular geometry of this molecule is square planar with a bond angle of 90 degrees.
Which statement describes a space-filling model of a molecule?
A.The radii of the atoms are represented by the symbol of the atom surrounded by dots in the
space-filling model.
B.The radii of the spheres in a space-filling model are proportional in size to the radil of the atoms
they represent
C.The radii of the atoms present in the compound determine the length of the bonds in a space-
filling model.
Answer:
Option B, In a space-filling model of a molecule, the radii of the spheres in a space-filling model are proportional in size to the radii of the atoms
they represent
Explanation:
In a space-filling model of a molecule, atoms are represented as sphere. The radius of the sphere is equal to the radius of the atom and the distance between the center of one sphere to the center of other represents the distance between the atomic nuclei
Option B is correct
Option A is incorrect, as dots are used in the space filling model to represent the atoms
Option C is incorrect because radii of atom do not represents the length of the bonds in a space- filling model
BRAINLIEST IF EXPLANATION IS GIVEN AND ANSWER IS CORRECT:
How much energy is required to raise the temperature of 15.6 grams of ice from -8.76 degrees Celsius to 85.9 degrees Celsius? Use 3 sig figs.
Answer:
Q = 2997.69 J
Explanation:
Given that,
The mass of ice, m = 15.6 grams
The temperature increases from -8.76 degrees Celsius to 85.9 degrees Celsius.
The specifc heat of ice is 2.03 J/g°C
We need to find the amount of energy required. The formula for energy required is given by :
[tex]Q=mc\Delta T\\\\=15.6\times 2.03\times (85.9-(-8.76))\\\\=2997.69\ J[/tex]
So, the required heat is equal to 2997.69 J.
Any corrections I need to make? Please help! And provide an actual answer please! Thank you!
Answer:
nah you good
Explanation:
it's perfect don't doubt yourself
Write a scientific explanation that explains how organelles perform specific tasks within cells.
USE CER (Claim Evidence Reasoning)
Answer:
Some of these parts, called organelles, are specialized structures that perform certain tasks within the cell. ... It also provides a track-like system that directs the movement of organelles and other substances within cells. Endoplasmic reticulum (ER) This organelle helps process molecules created by the cell
Organelles perform specific tasks within the cells such as protein synthesis, energy production, etc.
Organelles are specialized structures that perform different functions in the cells. Examples of organelles include lysosome, nucleus, chloroplast, mitochondria, endoplasmic reticulum, etc.
It should be noted that every cell process is done in a particular location in the cell. Some of the functions that are performed by the organelle include processing of food and waste, protein synthesis, energy production, replication, etc.
For example, the nucleus is used for the storage of DNA, mitochondria is vital for energy production, the ribosome is necessary for protein synthesis, etc.
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4 Weathering Assessment
2 of 132 of 13 Items
Question
POSSIBLE POINTS: 5.88
On a hot summer day, you and your friend decide to make a drink by mixing ice cubes, water, sugar, and Kool-Aid mix. Which of the following statements best describes what type of change has occurred?
This is an example of chemical change because the sugar dissolved.
This is an example of chemical change because the sugar dissolved.
This is an example of a physical change because the sugar dissolved
This is an example of a physical change because the sugar dissolved
This is an example of a physical change because the ice cubes began to melt.
This is an example of a physical change because the ice cubes began to melt.
This is an example of a chemical change because the Kool-aid dissolved and turned the water red.
Answer:
This is an example of a physical change because the ice cubes began to melt.
This is an example of a physical change because the ice cubes began to melt.
Explanation:
The above is the right answer to the question about the dissolution of the whole mixture mentioned in the excerpts above.
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Please help, I'm so confused!!!!
Answer:
[tex]\boxed {\boxed {\sf N_2}}[/tex]
Explanation:
Let's examine this reaction, especially the coefficients.
[tex]N_2+3H_2 \rightarrow 2NH_3[/tex]
First of all, remember that reactants are used to make the product. They are found on the left of the arrow usually. Therefore, N₂ and H₂ are the reactants, while NH₃ is the product. We can automatically eliminate NH₃ from our answer choices, because it is simply not a reactant.
Next, look at the coefficients.
N₂ has no coefficient, so a 1 is implied. H₂ has a coefficient of 3.Therefore, for the reaction to work, there must be 1 mole of N₂ and 3 moles of H₂.
We have 3.2 moles of N₂ and 5.4 moles of H₂.
Divide each amount given by the required amount for completion.
3.2 mol N₂/ 1 mol N₂= 3.2 times 5.4 mol H₂/ 3 mol H₂=1.8 timesTherefore, there is enough nitrogen to complete the reaction 3.2 times, but only enough hydrogen for 1.8 times. If everything is completely reacted, we will run out of hydrogen and have excess nitrogen.
3. Determine the pH of each of the following solutions. (Hint: See Sample Problem B.) a. 1.0 x 10-2 M HCI c. 1.0 x 10-MHI b. 1.0 x 10-3 M HNO3 d. 1.0 x 10-M HB
Answer:
a. pH = 2 b. pH = 3 c. pH = 1 d. Unanswerable
Explanation:
pH = -log[H+] OR pH = -log{H3O+]
and inversely
pOH = -log[OH-]
1. Determine what substance you are working with, (acid/base)
2. Determine whether or not that acid or base is strong or weak.
a. 1.0 x 10^-2M HCl
HCl is a strong acid, therefore it will dissociate completely into H+ and Cl- with all ions going to the H+, therefore, the concentration of HCl and concentration of H+ are going to be equal, meaning we simply take the negative logarithm of the concentration of HCl and that would equal pH
pH = -log[H+]
pH = -log(1.0x10^-2)
pH = 2
b. 1.0 x 10^-3M HNO3
HNO3 like part a, is a strong acid, therefore it would simply require you to take the negative logarithm of the concentration of the compound itself, to find its pH.
pH = -log[H+]
pH = -log(1.0 x 10^-3)
pH = 3
c. 1.0 x 10^-1M HI
Like the previous parts, HI is a strong acid
pH = -log[H+]
pH = -log(0.10)
pH = 1
d. HB isn't an element, nor is it a compound so that would be unanswerable.
Name the Following Binary Ionic Compounds:
a. AgCl
b. ZnO
c. CaBr2
d. SrF2
Explanation:
a.Silver chloride
b.zinc Oxide
c.calcium Bromide
d.strontium difluoride
Compare and contrast the characteristics of acids and bases. Give three
similarities and three differences. use COMPLETE SENTENCES for full points.
*
Answer:
Acid is a kind of chemical compound that when dissolved in water gives a solution with H+ ion activity more than purified water. A base is an aqueous substance that donates electrons, accept protons or release hydroxide (OH-) ions. An acid is a proton donor. While a base is a proton acceptor.
Explanation:
Hey mate, here's your answer...
what happen when a piece of silver metal is added to the copper sulphate solution
Answer:
Explanation:When silver Ag metal is added to copper sulphate CuSO4 solution, no reaction takes place as silver is less reactive than that of copper and cannot displace copper from its solution. Hence, when a piece of silver metal is added to copper sulphate solution there will be no reaction.
Answer:
There will be no reaction
Explanation:
Therefore, when silver Ag metal is added to copper sulphate CuSO4 solution, no reaction takes place as silver is less reactive than that of copper and cannot displace copper from its solution. Hence, when a piece of silver metal is added to copper sulphate solution there will be no reaction.
Rank these transition metal ions in order of decreasing number of unpaired electrons. If two ions have the same number of unpaired electrons
Fe^3 , Mn^4+ , V3+ , Ni^2+ , Cu^+
Answer: [tex]Fe^{3+} > Mn^{4+}[/tex] > [tex]V^{3+}[/tex] = [tex]Ni^{2+}[/tex] > [tex]Cu^+[/tex]
Explanation:
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.
Fe: 26: [tex]1s^2s^22p^63s^23p^64s^23d^{6}[/tex]
[tex]Fe^{3+}:23:1s^2s^22p^63s^23p^63d^{5}[/tex] : 5 unpaired electrons
Mn: 25: [tex]1s^2s^22p^63s^23p^64s^23d^{5}[/tex]
[tex]Mn^{4+}:23:1s^2s^22p^63s^23p^63d^{3}[/tex] : 3 unpaired electrons
V: 23: [tex]1s^2s^22p^63s^23p^64s^23d^{3}[/tex]
[tex]V^{3+}:23:1s^2s^22p^63s^23p^63d^{2}[/tex] : 2 unpaired electrons
Ni : 28 : [tex]1s^2s^22p^63s^23p^64s^23d^{8}[/tex]
[tex]Ni^{2+}:23:1s^2s^22p^63s^23p^63d^{8}[/tex]: 2 unpiared electrons
Cu : 29 : [tex]1s^2s^22p^63s^23p^64s^13d^{10}[/tex]
[tex]Cu^{+}:23:1s^2s^22p^63s^23p^63d^{10}[/tex]: 0 unpaired electrons
Thus the order of decreasing number of unpaired electrons:
[tex]Fe^{3+} > Mn^{4+}[/tex] > [tex]V^{3+}[/tex] = [tex]Ni^{2+}[/tex] > [tex]Cu^+[/tex]
Name a compound containing oxygen and selenium.
Answer:
Selenium Dioxide: Se[tex]O_{2}[/tex]
Explanation:
This is a compound that contains both Selenium and Oxygen.
All of the following are ways to increase the speed at which a solute dissolves into a solvent except:
A Increasing the heat of the solution
B Stirring or shaking the solution
C Freezing the solution
D Crushing the solvent into smaller pieces.
PLEASE HELP
Activation energy is
a. the energy required to form the activation complex.
b. the net energy difference between the products and reactants.
c. the heat of reaction.
d. free energy.
What are balancing equations and explain the conservation of mass?
Matter cannot be created or destroyed in chemical reactions. This is the law of conservation of mass. In every chemical reaction, the same mass of matter must end up in the products as started in the reactants. Balanced chemical equations show that mass is conserved in chemical reactions.
Matter cannot be created or destroyed in chemical reactions. This is the law of conservation of mass. In every chemical reaction, the same mass of matter must end up in the products as started in the reactants. Balanced chemical equations show that mass is conserved in chemical reactions
what are the chemical symbols of the particles found in the calcium chloride crystal (lattice)
Answer:
Formula and structure: The chemical formula of calcium chloride is CaCl2, and its molar mass is 110.983 g/mol. It is an ionic compound consisting of the calcium cation (Ca2+) and two chlorine anions (Cl-). The bivalent calcium metal forms an ionic bond with two chlorine atoms, as shown below.
Based on the ionic nature of calcium chloride, the chemical symbols of the particles found in the calcium chloride crystal is Ca²⁺ and Cl⁻.
What are ionic compounds?
Ionic compounds are compounds which are composed of ions.
Calcium chloride is an ionic compound composed of the ions, calcium ions and chloride ions.
The chemical formula of calcium chloride is CaCl2, and its molar mass is 110.983 g/mol.
The symbol for calcium ion is Ca²⁺
The symbol for chloride ion is Cl⁻.
Therefore, the chemical symbols of the particles found in the calcium chloride crystal is Ca²⁺ and Cl⁻.
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What is the molar concentration of 2.21 mil of KCI dissolved in 0.6068L of solution? explain why
Answer:
3.64M is the molar concentration of the solution
Explanation:
Molarity (Molar concentration, M) is an unit of concentration widely used in chemistry defined as the ratio between the moles of solute (In this case, KCl) and the volume of the solution in liters.
As you can see, the moles of KCl are 2.21 mol, and the volume of the solution is 0.6068L. The molarity is:
2.21mol / 0.6068L =
3.64M is the molar concentration of the solution
How does every single cell in the body get the substances it needs to carry out the chemical reaction that provides it energy?
A gas occupies 56 L at 73°C. What volume will the gas occupy if the temp. cools to 0°C?
Answer:
44.2 L
Explanation:
Use Charles Law:
[tex]\frac{V1}{T1} =\frac{V2}{T2}[/tex]
We have all the values except for V₂; this is what we're solving for. Input the values:
[tex]\frac{56 L}{346K} =\frac{V2}{273K}[/tex] - make sure that your temperature is in Kelvin
From here, we need to get V₂ by itself. To do this, multiply by 273 on both sides:
[tex]\frac{56*273}{346} = V2[/tex]
Therefore, V₂ = 44.2 L
It's also helpful to know that temperature and volume are linearly related. So, when temperature drops, so will volume and vice versa.
Which one of the equations below is an exothermic reaction?
A) CO2 (g) - C(s) + O2 (g) AH = 394 kJ/mol
B) CaO (s) + H2O (D = Ca(OH)2 (aq) AH = -64
kJ/mol
C) C (s) + 2 F2 (g) - CF. (9) AH = 141.3
kJ/mol
2 NO (9) AH° = 180.6
D) N2 (g) + O2 (9)
kJ/mol
Answer:
B) CaO(s) + H2O(l) --> Ca(OH)2(aq)
Explanation:
This is the only reaction with a negative enthalpy value. Exothermic reactions have a negative enthalpy.
in a dry cell the electrolyte is a ______
A. solid
B. paste
C. liquid
D. gas
In a dry cell the electrolyte is a paste.
Minerals with an electric charge called electrolytes could be found in human blood and other bodily fluids. Electrolytes have a variety of effects on how your brains work, including how much water is in your body. The pH balance in the blood (pH) Our muscles work.
The dry-cell battery would be a gadget composed of one or even more electrochemical cells which change electrical energy from chemical energy that has been stored. It has an electrolyte inside of a paste or another moist substance. Zinc anode, as well as carbon cathode, are found inside a central rod of a standard dry cell battery.
Therefore, in a dry cell the electrolyte is a paste.
Hence, the correct answer will be option (B).
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Help please!!! I'll name you brainliest!!
Answer:
i believe the answer is b
Explanation:
a gradual increase in the overall temperature of the earth's atmosphere generally attributed to the greenhouse effect caused by increased levels of carbon dioxide, chlorofluorocarbons, and other pollutants.
need some help with just one question please help.What is the pH of a 9.7 x 10-5 M NaOH solution? (2 formulas)
What do you think
about the Civil Rights
Movement?
What U.S. state is directly north of Cuba?
Answer:
Florida
Explanation:
Directly north of Cuba is the rural bar fight of a state, Florida
The theory of plate tectonics describes the movement of continental plates across the Earth's surface as if they were riding on a
conveyer belt of convection. Although the plate tectonic movement is extremely slow, there is evidence of this theory. Which
statements below support the theory of plate tectonics? Select ALL that apply.
A)Species became extinct more quickly at the end of the Cretaceous period.
B)99
Fossils of nearly identical species are found on both South America and
African continents.
C)Areas of subduction often have high seismic activity as one plate moves
under another plate.
D)Species become adapted to particular environments as random mutations
generate new phenotypes.
E)Marsupials existed on both North American and Australian continents
when these land masses were connected.
Answer:
The Answers are B, C, and E.
Explanation:
Fossils of nearly identical species are found on both South America and African continents. Marsupials existed on both North American and Australian continents when these land masses were connected. Areas of subduction often have high seismic activity as one plate moves under another plate. Since the continents were once joined, there is the likelihood that species originated in one location and then spread to other areas as the continents moved is likely. This explains the similarity of fossils or species in very geographically remote areas. The high activity of seismic movement also is best explained by plate movement.
The statements that supports the theory of plate tectonics are:
B) Fossils of nearly identical species are found on both South America and African continents. C) Areas of subduction often have high seismic activity as one plate moves under another plate.E) Marsupials existed on both North American and Australian continents when these land masses were connected.According to the question, we are asked to prove the evidence of the plate tectonic theory based on the movement of continental plates across the Earth's surface.
Plate tectonic theory states that there is a detachment of the outer crust of the Earth and they join when the upper part meets the continental plates and diverges across the planet.
Therefore, the statements that support this theory are the facts that:
Fossils of similar species are found in different continentsThere are different areas of seismic activity as a result of plate movementMarsupiais both existed on different continents even as their land masses are connected.Therefore, the correct answers are options B, C and E
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ionic bounds are quite weak and will break easily? T or F
Answer:
False
Explanation:
Ionic bonds are actually strong, but unfortunately can be broken easily
Are electron shells or orbitals actually inside the atom or are they outside of the structure of the atom?
Answer:
Electrons in atoms occupy energy levels, also called electron shells, outside the nucleus . Different shells can hold different maximum numbers of electrons. The electrons in an atom occupy the lowest available energy level first. This is the shell nearest the nucleus.
Explanation:
Do the rocks get older or younger as you go away from the Mid Atlantic Ridge
towards the continents? Why? EXPLAIN.
Answer:
Rocks get older as we go away from the Mid Atlantic Ridge towards the continents
Explanation:
As the plates move away from each other, new ocean lithosphere is created at the ridge. This also widens the ocean basin and leads to sea floor spreading.
The rock of the ocean floor are symmetrically aligned and they get become older as they move away from the crest of the ridge.
Thus, rocks get older as we go away from the Mid Atlantic Ridge towards the continents
