7. What is the shape of an s orbital?
A dumbbell
B clover leat
C spherical
D donut
What does the law of conservation of energy state about energy in a closed system?
Energy cannot be created or destroyed.
Energy can be created but not destroyed.
O Energy can be destroyed but not created.
O Energy can be either troyed or created.
Answer:
Energy cannot be created or destroyed.
Explanation:
According to the law of conservation of energy, energy can neither be created nor it can be destroyed. Energy can only be transformed from one matter to another. The conservation of energy remains constant in an isolated system. The law is applicable in the system that does not exchange energy in the environment. Energy changes its form but remains constant.
Answer:
Energy cannot be created or destroyed
Explanation:
It's A on Edge
The rows on the periodic table are arranged so that ______ are on the right side and ______ are on the left side.
Non-metals/Metals
Metals/Non-metals
Gases/Metals
Metals/Gases
Answer:
Metals on the right side and non metals on the left side.
The correct answer is; Non-metals/Metals
Metals are found at the left hand side of the periodic table while non metals are found at the right hand side of the periodic table.
The periodic table is an arrangement of elements in order of increasing atomic number according to the modern periodic law.
The elements in the periodic table are arranged in rows and columns. The rows are called periods while the columns are called groups.
Metals are found at the left hand side of the table while non metals are found at the right hand side of the table.
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Elastic energy is stored when an object is stretched. Is this an example of potential or kinetic energy?
Answer:
potentialExplanation:
Each time energy is transferred into an object, two things happen.
It is either used to do work, or it is stored in the object.
If it is stored, the object is given potential energy that can be released to do work.
it is like in a coiled spring or a stretched elastic band. The energy is stored in the bonds between atoms. The bonds absorb energy as they are put under stress and release the energy as they relax (when the object returns to its original shape).
A 25 milliliter sample of HNO2 (aq) is neutralized by 32.1 milliliters of 0.150 M KOH (aq). What is the concentration of the acid? 20 points for you
Answer:
0.193M.
Explanation:
A well-known scientist testifies that she believes a piece of evidence is accepted by science. The judge rules that the evidence is not, in his opinion, admissible. Which case applies to the decision?
a. Daubert v. Merrell Dow Pharmaceuticals
b. Daubert v. Frye
c. Kumho Tire Co. Ltd. v. Daubert
d. Frye v. United States
Answer:
The correct answer is C:
Kumho Tire Co. Ltd V. Daubert
Explanation:
In this case, the appellant (Daubert) has sued Kumho Tire Co. Ltd (the defendant) when 3 months prior the right rear tyre of his car exploded while the car was in motion killing a passenger and injuring others severely.
The appellant employed the services of an expert who had worked for 10 years with Michelin to give his opinion as having studied the attributes of the tire technology.
In a counter-argument, the defendant rather than dispute the opinion of the expert urged the court to exclude it as evidence because his methodology didn't conform to the requirements of the Law as given in Rule 702 of the Federal Rules of Evidence.
True to the defendants' position, the Law by the ruling in Daubert v Merrell Dow Pharmaceuticals required that for the opinion to count, it had to be scientifically correct. It was hence excluded as evidence in the case.
Cheers!
Tansition elements form:
A) colorless ions in solution, multiple positive
oxidation states
B) colorless ions in solution, multiple negative
oxidation states
C) colored ions in solution, multiple positive
oxidation states
D) colored ions in solution, multiple negative
oxidation states
**Please I need it fast**
List the ways in which lightning can be produced
Answer:
Lightning is produced by the rapid transfer of free electrons when one of the following conditions exist:
One part of a cloud is positively charged and a neighboring part of the same cloud is negatively charged.
A positively charged cloud comes near a negatively charged cloud.
A cloud with either a positive charge or a negative charge comes near the earth.
SOMEONE PLS HELP ITS FOR A TEST!!
4. An ion is an atom that has lost or gained protons.
O True
O False
5. Non-metals are on the right side of the periodic table and they tend to GAIN electrons in ionic bonds.
O True
O False
Explanation:
4=true
5. true
hope this helps. good luck with your test.
A news report is an example of what kind of literature?
What type of literature often contains deeper ideas and concepts?
Answer:
1) I dont knoe
2) Poetry
Explanation:
Answer: Symbolic language is used by an author to hint at deeper meanings.
Explanation: penn foster
What are the conditions for an addition reaction?
Answer:
I don't understand
Explanation:
Answer:
Molecules containing carbon—hetero double bonds like carbonyl (C=O) groups, or imine (C=N) groups, can undergo addition, as they too have double-bond character. An addition reaction is the reverse of an elimination reaction. For instance, the hydration of an alkene to an alcohol is reversed by dehydration.
hope that helps!
In the reaction between Lithium Sulfate and an excess of Lead (II) Nitrate, how many molecules of Lithium Nitrate can be expected as a product if 13.3 grams of Lithium Sulfate are used? Show your work.
Li2SO4 + Pb(NO3)2 =
Answer:
[tex]1.46x10^{23}molecules \ LiNO_3[/tex]
Explanation:
Hello,
In this case, the undergoing chemical reaction is:
[tex]Li_2SO_4 + Pb(NO_3)_2 \rightarrow PbSO_4+2LiNO_3[/tex]
Thus, since lead (II) nitrate is in excess, we can directly compute the moles of lithium nitrate by applying the 1:2 molar ratio between them in the chemical reaction as well as the molar mass of Lithium Sulfate that is 110 g/mol for the stoichiometric shown below factor:
[tex]n_{LiNO_3}=13.3gLi_2SO_4*\frac{1molLi_2SO_4}{110gLi_2SO_4} *\frac{2molLiNO_3}{1molLi_2SO_4} =0.242molLiNO_3[/tex]
Finally, by using the Avogadro's number we are able to compute the molecules:
[tex]0.242molLiNO_3*\frac{6.022x10^{23}molecules\ LiNO_3}{1mol}=1.46x10^{23}molecules \ LiNO_3[/tex]
Best regards.
Complete question:
In the reaction between Lithium Sulfate and an excess of Lead (II) Nitrate, how many molecules of Lithium Nitrate can be expected as a product if 13.3 grams of Lithium Sulfate are used? Show your work.
Li₂SO4 + Pb(NO3)₂ = LiNO₃ + PbSO₄
Answer:
0.242 molecules of Lithium Nitrate
Explanation:
Given:
Li₂SO₄ + Pb(NO3)₂ = LiNO₃ + PbSO₄
A balanced form of the equation:
Li₂SO₄ + Pb(NO3)₂ = 2LiNO₃ + PbSO₄
When 13.3 grams of Lithium Sulfate (Li₂SO4 ) are used, the number of molecules of Lithium Nitrate (LiNO₃) that can be expected as a product is calculated as;
molecular mass of Li₂SO₄ = (7 x 2) + (32) + (16 x 4)
= 14 + 32 + 64
= 110 g
110 g of Lithium Sulfate -----------> 2 molecules of Lithium Nitrate
13.3 g of Lithium Sulfate ------------> ? molecules of Lithium Nitrate
= (2 x 13.3) / 110
= 0.242 molecules of Lithium Nitrate
Therefore, 13.3 grams of Lithium Sulfate will produce 0.242 molecules of Lithium Nitrate
What would the pOH of a solution be if the [H"]= 3.00 x 10-5 moles/liter?
8.52
9.48
Answer:
9.48
Explanation:
pH=-log(H+)
pOH+pH=14
Answer:
9.48
Explanation:
Got it right on Odessyware ;) Have a Nice Day!!!!
Drag each label to the correct location on the diagram. Each label can be used more than once.
What is the correct way to represent the ionic compound sodium fluoride?
Answer:
NaF
Explanation:
I'm not exactly sure what you are asking for, but this is the formula for sodium fluroride.
We need the diagram to be able to help you with this, please take a screenshot of the diagram.
Eva wants to overcome her internalized racism. Which action will help her do so ?
OA. She should make friends only with people like her so that she can avoid hearing hurtful comments.
B. She should take an active role in identifying people who can serve as her role models.
OShe should blame others for making her feel the way she does.
OD. All of the above
THE OTHER PERSON IS WRONG TRUST ME
THE ANSWER IS C. I TOOK THE TEST MYSELF AND GOT A %100.
4 Points
The battery in the circuit shown is 9.0 V, and the current flowing through the
circuit is 3.0 A. What is the resistance?
Answer:
3 ohms
Explanation:
R=V / I
R=9V / 3 A
R=3 ohms
I'm completely lost and cant find the answer
Answer:
Option B. 4.5g
Explanation:
The balanced equation for the reaction is given below:
2Na + 2H2O —> 2NaOH + H2
Next, we shall determine the mass of Na and the mass of H2O that reacted and the mass of H2 produced from the balanced equation. This is illustrated below:
Molar mass of Na = 23g/mol
Mass of Na from the balanced equation = 2 x 23 = 46g
Molar mass of H2O = (2.02x1) + 16 = 18.02g/mol
Mass of H2O from the balanced equation = 2 x 18.02 = 36.04g
Molar mass of H2 = 2.02 x 1 = 2.02g/mol.
Mass of H2 from the balanced equation = 1 x 2.02 = 2.02g
From the balanced equation above,
46g of Na reacted with 36.04g of H2O to produce 2.02g of H2.
Next, we shall determine the limiting reactant. This is illustrated below:
From the balanced equation above,
46g of Na reacted with 36.04g of H2O.
Therefore, 120g of Na will react with = (120 x 36.04)/46 = 94.02g of H2O.
From the calculations made above, we can see that it will take a high mass of H2O i.e 94.02g than what was given i.e 80g to react completely with 120g of Na. Therefore, H2O is the limiting reactant and Na is the excess reactant.
Finally, we shall determine the mass of H2 produced from the reaction as follow:
The limiting reactant will be used in this case as it will give the maximum yield of H2 since all of it is used up in the reaction.
From the balanced equation above, 36.04g of H2O reacted to produce 2.02g of H2.
Therefore, 80g of H2O will react to produce = (80 x 2.02)/36.04 = 4.5g of H2.
Therefore, 4.5g of H2 is produced from the reaction.
In a single displacement reaction between Sodium Phosphate and Barium, how much of each product (in grams) will be formed from 10.0 grams of Barium? Show your work.
Answer:
14.6 g of barium phosphate
3.35 g of sodium metal
Explanation:
2Na3PO4(aq) + 3Ba(s) -------> Ba3(PO4)2(aq) + 6Na(s)
The first step in any such reaction is to but down the balanced reaction equation according to the stoichiometry of the reaction.
The two products formed are barium phosphate and sodium metal.
Number of moles of barium corresponding to 10.0g of barium = mass of barium/ molar mass of barium
Molar mass of barium = 137.327 g
Number of moles of barium = 10/137.327
Number of moles of barium = 0.0728 moles
For barium phosphate;
3 moles of barium yields 1 mole of barium phosphate
0.0728 moles yields 0.0728 moles × 1/3 = 0.0243 moles of barium phosphate
Molar mass of barium phosphate = 601.93 g/mol
Therefore mass of barium phosphate = 0.0243 moles × 601.93 g/mol = 14.6 g of barium phosphate
For sodium metal
3 moles of barium yields 6 moles of sodium metal
0.0728 moles of barium yields 0.0728 × 6 / 3 = 0.1456 moles of sodium
Molar mass of sodium metal= 23 gmol-1
Mass of sodium metal= 0.1456g × 23 gmol-1 = 3.35 g of sodium metal
CHEM PLZ HELP
2NaHCO3(s) → Na2CO3(s)+CO2(g)+H2O(ℓ)
If the chemical reaction above is occurring, we would likely observe...
Question 14 options:
Increase in CO2 (g) over time.
No NaHCO3 (s) will be left after a time.
Increase in NaHCO3 (s) over time.
Decrease in Na2 CO3 (s) over time.
Answer:
Increase in CO2 (g) over time.
No NaHCO3 (s) will be left after a time
Explanation:
The reaction, shown below;
2NaHCO3(s) → Na2CO3(s)+CO2(g)+H2O(ℓ) is a decomposition reaction. A decomposition reaction is a kind of chemical reaction in which a given chemical specie breaks up to give other chemical species. Decomposition may be induced by heat or light.
Usually, there is only one reactant in a decomposition reaction; the specie that disintegrates into the products. This reactant usually decreases in concentration steadily because it is converted into products. This is why the mass of NaHCO3(s) in the system continues to decrease steadily until it finally falls to zero.
Conversely, the concentration (for aqueous) or volume (for gases) or mass (for solid) products of the reaction increases steadily as the reaction progresses. This explains why the volume of CO2 in the system will steadily increase over time.
Tansition elements form:
A) colorless ions in solution, multiple positive
oxidation states
B) colorless ions in solution, multiple negative
oxidation states
C) colored ions in solution, multiple positive
oxidation states
D) colored ions in solution, multiple negative
oxidation states
Answer:
C. Because transition elements has 4 special chatacteristics
forms colored ions
has multiple oxidation numbers
forms complex ions
can act as catalyst
An 85 kg construction worker has 37 485 J of gravitational potential energy. To the nearest whole number, the worker is___
m above the ground
Answer:
44,1 m
Explanation:
Ep= m * g * h
37485 = 85 * 10 * h
h = 44,1 m
Answer:
The answer is 45 on edge 2020
Explanation:
hope this helps :)
does anyone know the answer?????
Answer:
In chemistry, pH (/piːˈeɪtʃ/) (abbr. power of hydrogen or potential for hydrogen) is a scale used to specify how acidic or basic a water-based solution is. Acidic solutions have a lower pH, while basic solutions have a higher pH.
Explanation:
that should answer ur question
Myka wants to know more about the physical properties of salt and sugar. She performs the investigation in the video above. What can she conclude about salt and sugar?
Question 5 options:
The bonds in sugar are stronger than the bonds in salt, because sugar was so reactive when the heat was added.
The bonds on salt are stronger than the bonds in sugar, because it would have required adding even more energy to break the bonds in salt.
Answer:
Hi there!
The correct answer is: The bonds on salt are stronger than the bonds in sugar, because it would have required adding even more energy to break the bonds in salt.
Explanation:
Salt has ionic bonds, while sugar has covalent bonds.
Ionic bonds are stronger than covalent bonds, therefore it takes more energy to break.
Boron (B): 1s 2s 2p
E=
F=
G=
Answer:
E=2
F=2
G=1
Explanation: this is the answer promise
Answer:
E=2
F=2
G=1
Explanation:
When an electron of a hydrogen atom travels from n = 4 to n = 2, a photon of energy 4.165 × 10-19 joules is released. Calculate the wavelength associated with this radiation.
Answer:
Explanation:
please delete this it was a mistake
Answer:
4.77 × 10-7 meters
Explanation:
Energy of photon, E = hν
Frequency of photon,
Thus, energy of photon,
Therefore, 4.165 × 10-19 joules =
λ =
λ =
λ = 4.77 × 10-7 meters
The frequency of a photon having energy of 4.165 × 10-34 joules is 4.77 × 10-7 meters.
In the following table, all the columns for the element oxygen are filled out correctly. Element Electron Structure of Atom Electron Structure of Ion Net Ionic Charge Oxygen 1s2, 2s2, 2p4 1s2, 2s2, 2p6 -2 True False
Answer:
1s², 2s², 2p⁴
Explanation:
Hello,
To determine the filling of electrons in an orbital, we'll have to apply several rules such as
1. Aufbau principle
2. Hunds rule
3. Pauli's exclusion principle.
I won't explain the above rules because I don't want to deviate from the question, but however if you understand them, it'll make questions like this easier to answer.
For oxygen atom
₈O = 1s² 2s² 2p⁴
The filling of the orbital must start with 1s orbital till the space of the two electrons are filled before moving to 2s orbital filling the two space in the shell and then finally the remaining 4 electrons on the 2p orbital.
Assuming the net ionic charge of oxygen in this case is zero (0) and has not accepted electron.
However, oxygen usually accepts 2e⁻(electrons) to attain stability (all orbital strive to attain duplet or octet configuration).
Assuming we have O²⁻, the electron configuration change to 1s² 2s² 2p⁶. This is the state oxygen usually forms compounds in excerpts with group 1 metals where it is able to form super oxide.
Explain the relationship between the observations and the hypothesis
Which structure shows the correct electron arrangement in CCl4?
A central upper C is single bonded to upper H above, below, and to the left, and single-bonded to upper C l to the right. The C l has three pairs of electron dots, above, right, and below.
A central upper C is single bonded to upper C l to the top, bottom, and left; those upper C l atoms have three pairs of electron dots on the sides away from the bond. The C is also single bonded to an upper H to the right.
A central upper C is single bonded to upper H above and below, and to upper C l to the left and right. The C l have three pairs of dots, above, below, and to the side opposite the bond.
A central upper C is single bonded to upper C l above, right, left, and below. All the C l atoms have 3 pair of electron dots, on the three sides that do not have the bond.
Answer:
the correct answer is D.
Explanation:
Got it right on edg. 2020
The correct structure for [tex]CCl_{4}[/tex] will be " All the C l atoms have 3 pair of electron dots, on the three sides that do not have the bond."
What is bond?A chemical bond would be a strong bond which could be formed among atoms, ions, as well as molecules to create chemical compounds.
What is electron dots?Lewis dot structures, commonly known as electron dot structures, were schematics showing the interatomic chemical bonds in such a molecule.
The electron dot structure of [tex]CCl_{4}[/tex] is shown below:
It can be seen that each carbon attached by single bond.
The correct structure for [tex]CCl_{4}[/tex] will be " All the Cl atoms have 3 pair of electron dots, on the three sides that do not have the bond."
Therefore, the correct answer will be option (D).
To know more about electron dot structure.
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Discribe how to prepare 50.00mL of a 3.00M hydrochloric acid solution using 12.0 M HCl.
Answer:
The answer to your question is given below.
Explanation:
To prepare 50mL of 3M HCl, we must calculate the volume of the stock solution needed. This can obtained as follow:
Molarity of stock solution (M1) = 12M
Volume of stock solution needed (V1) =?
Molarity of diluted solution (M2) = 3M
Volume of diluted solution (V2) = 50mL
The volume of the stock solution needed can be obtained by using the dilution formula as shown below:
M1V1 = M2V2
12 x V1 = 3 x 50
Divide both side by 12
V1 = (3 x 50)/12
V1 = 12.5mL
The volume of the stock solution needed is 12.5mL
Therefore, to prepare 50mL of 3M HCl, we must measure 12.5mL of the stock solution i.e 12M HCl and then, add water to the mark in a 1L volumetric flask. Now we can measure out 50mL of the solution.
HELPPPPPP
Cracking of heptane please help! Show the chemical formula and the diagrams