Which of the following chemical equations are correctly balanced? Balance the equations that are not balanced.
Answer:
Below:
Explanation:
a)2 Na + F2 = 2 NaF
It's already balanced.
Type is synthesis.
b)H2 + I2 = 2 HI
It's balanced now.
Type's synthesis.
Option A
On products side
Na=2F=2On reactants side
Na=2F=2Hence balanced
You are the IT consultant to a petro-chemical company. The company has ten servers and 250 workstations located in San Francisco and New Orleans. They are currently using tape cartridge backup on a nightly basis. What is the obvious flaw in this solution
One of the flaws of this solution is that because it is programmed at night data loss is possible if a failure occurs at this time.
Why is tape cardrigde backup used?This is used to save important information or date from a device such as a computer periodically.
What are the advantages of this solution?Tape cardridge backup is the best option if a lot of data has to be saved because they are efficient and low cost.
What is one possible flaw?The only problem is that because the back up is automatically programmed at night, a failure such as a problem in electricity implies valuable data might be lost.
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If atom a gives up electrons to atom b what will the elecrical charge of atom a be
Answer:
The electric charge of the atom 'a' will be "+1".Explanation:
When an atom gains/loses an electron, the atom becomes charged, and is called an ion. Gaining an electron results in a negative charge, so the atom is an anion. Losing an electron results in a positive charge, so atom ion is a cation.
It means that the 'Atom A' is giving that is, losing the electrons
Calculate the mass of ammonium sulfide (nh4)2s in 3.00 l of a 0.0200 m solution. g (nh4)2s
Taking into account the definition of molarity, 4.08 grams of ammonium sulfide are present in 3.00 L of a 0.0200 M solution.
Definition of molarityMolar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
[tex]Molarity=\frac{number of moles}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
Mass of ammonium sulfideIn this case, you know:
Molarity: 0.0200 Mnumber of moles: ?volume: 3 LReplacing in the definition of molarity:
[tex]0.0200 \frac{moles}{liter}=\frac{number of moles}{3 L}[/tex]
Solving:
0.0200 [tex]\frac{moles}{liter}[/tex]× 3 L= number of moles
0.06 moles= number of moles
On the other side, the molar mass is the amount of mass that a substance contains in one mole. In this case, the molar mass of ammonium sulfide is 68 g/mole.
Then, the amount of mass contained in 0.06 moles is calculated as:
0.06 moles×[tex]\frac{68 grams}{1 mole}[/tex]= 4.08 grams
Finally, 4.08 grams of ammonium sulfide are present in 3.00 L of a 0.0200 M solution.
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Answer:
4.09 is the correct answer.
A triple bond is made up of
sigma bond(s) and
1,2
pi bond(s).
2,1
Answer:
1 sigma bond and 2 pi bonds
Explanation:
A triple bond is made up of 1 sigma bond and 2 pi bonds.
Given example is that of ethyne
Answer:
1 [tex]\sigma[/tex] and 2π bonds
Explanation:
Always remember that
First bond among any two atoms is always Sigma bond .then rest forming bonds are pi bondsBreaking a Signa bond is far difficult than breaking pi bondsThat's why tripple bond is unstableThe general example is
N=N bond
The diagram shows three steps in the carbon cycle.
The Carbon Cycle
Which two phrases best summarize the events taking place in Step 2?
A. Cellular respiration
B. Storing carbon dioxide in living organisms
C. Photosynthesis
D. Releasing carbon dioxide into the atmosphere
According to the diagram, cellular respiration and photosynthesis are the phrases that best summarize the events taking place in Step 2.
What is the Carbon Cycle?It is the way carbon circulates through the atmosphere, the oceans, and the Earth's surface and interior.
Cellular respiration and photosynthesis respectively release and capture carbon dioxide from the atmosphere, as a by-product or input of their biochemical pathways, carbon from CO2 is absorbed by plants and released along with water vapor during animal respiration.
Therefore, we can conclude that according to the diagram, cellular respiration and photosynthesis are the phrases that best summarize the events taking place in Step 2.
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I'd say Photosynthesis and Storing carbon dioxide in living organisms.
But the person above me shows alot more detail than I have.
Identify each of these substances as acidic, basic, or neutral. Pure water, pH = 7. 0 lake water, pH = 6. 5 baking soda solution, pH = 9 soapy water, pH = 12.
Answer:
neutral acidic basic basic
Explanation:
>7 = acid 7 neutral >7 basic
Does anyone have the data table answers for 8.03 - Solutions Lab Report?
A laboratory report is an important part of the scientific process that communicate the important work that has been done.
How to depict the laboratory report?Your information is incomplete. Therefore, an overview of a laboratory report will be given. The laboratory report is important for future studies a d experiments.
A laboratory report is broken down intosections such as title, abstract, introduction, methods, materials, results, discussion conclusion, and references.
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Which end of an earthworm contains an organ that can detect smells? Use observations from the lab to support your answer.
Is there a relationship between the reactivity of a metal and its position in the periodic table?
Ca, Al, Mg
Write Evidence and Reasoning separately.
Answer:
Yes,
Chemical Reactivity of metals decrease as you go left to right of the periodic table Chemical Reactivity increases as you go down the group....
Explanation:
Hope it Helps!!!
:)
What are the top eight elements found in the Earth’s crust?
Answer: You should learn the symbols for the eight most abundant elements in the Earth's crust (Oxygen (O), Silicon (Si), Aluminum (Al), Calcium (Ca), Iron (Fe), Magnesium (Mg), Sodium (Na), and Potassium (K) .
Explanation:
True or false: The rate law for an elementary step can be deduced from its reaction stoichiometry (i.e., from the balanced equation for the step).
Answer:
True
Explanation:
When determining rate law, the coefficients in the balanced equation are used to determine how different concentrations affect the rate.
(50 points) iii. What would happen to the equilibrium position if more CHO2– were added to the solution? (4 points)
When more products or reactants are added to a reaction that is in equilibrium, the equilibrium will shift so as to annul the effects of adding the products/reactants.
Le Chartelier principleIt states that when a reaction is in equilibrium and one of the constraints that affect the rates of chemical reactions is applied, the equilibrium will shift accordingly so as to annul the effects of the added constraint.
Thus, if more products are added, the equilibrium will shift to produce more reactants. If more reactants are added, the equilibrium will shift to produce more products.
Hence, what will happen to the equilibrium position depends on whether CHO2– is a reactant or product.
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What volume is occupied by 2.1 g O2 at 13 C and a pressure of 0.1atm?
PV=nRT
n = mole = 2.1 g : 32 g/mole = 0.065
T = 13 + 273 = 286 K
V = nRT/P
V = (0.065 x 0.08205 x 286)/0.1
V = 15.253 L
How to tell if the self ionization reaction is endothermic
If the self ionization reaction is endothermic then it will shift on right side from equilibrium if we increase the temperature.
What is endothermic reactions?Endothermic reactions are those reactions in which heat or energy is absorbed by the reactants for the formation of product.
If the self ionization reaction is endothermic in nature then in this condition at the equilibrium if we increases the temperature then the formation of ions increases as a result of the shift of the reaction towards the right side.
Hence, by increasing the temperature we can predict whether the reaction is endothermic or not.
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For the neutralization reaction involving hno3 and ca(oh)2, how many liters of 1. 55 m hno3 are needed to react with 45. 8 ml of a 4. 66 m ca(oh)2 solution?
For the neutralization reaction involving HNO₃ and Ca(OH)₂, liters of 1.55 M HNO₃ are needed to react with 45.8 ml of a 4.66 m Ca(OH)₂ solution is 0.270 L.
What is neutralization reaction?Those reactions in which acids and bases will combine with each other for the formation of water molecule and salt, is known as neutralization reaction.
Given chemical reaction is:
2HNO₃ + Ca(OH)₂ → 2H₂O + Ca(NO₃)₂
Moles (n) of Ca(OH)₂ will be calculated by using the below formula:
M = n/V, where
M = molarity = 4.66M
V = volume = 45.8 mL = 0.045 L
n = (4.66)(0.045) = 0.2097 mol
From the stoichiometry of the reaction,
1 mole of Ca(OH)₂ = reacts with 2 moles of HNO₃
0.2097 mole of Ca(OH)₂ = reacts with 2×0.2097=0.419 moles of HNO₃
Again by using the molarity equation volume will be calculated for HNO₃ as:
V = (0.419) / (1.55) = 0.270 L
Hence required volume of HNO₃ is 0.270 L.
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Which of the following is an example of a chemical change taking place?
Answer:
Burning, cooking, rusting, and rotting
What is the formula for an ionic compound made of carbon and oxygen?
Ionic compounds are substances that are made up of ions. There is no ionic formula as carbon and oxygen do not form an ionic compound.
What are ionic compounds?Ionic compounds are compounds that have two differently charged species that bind together. The positive metal species binds to the negative nonmetal species.
Carbon and oxygen both are nonmetals and cannot form a bond as nonmetals gain electrons and metals donates electrons for the bond formation.
Therefore, no ionic compound is present for carbon and oxygen.
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_7 A teacher has a bottle of 12.0 M hydrochloric acid. She wants to make 2.0 L of 3.0 M HCl for her chemistry classes. How much of the 12.0 M HCI will she need to use?
А. 0.5 L
B 2L
C 20 L
D 50 L
Show your work in this box. No work, no credit.
Answer:
C 20 L
Explanation:
Apply the formula C1 × V1 = C2 × V2 where, C1 = initial concentration , 12M V1 = initial Volume , ? C2 = Final concentration,0.25M V2 = Final Volume , 1.0L V1 = C2 x V2
Why is knowing density important to us? Give a reasonable answer please don’t copy what the internet has I already tried doing that I can’t
In a neutral atom, what is the number of electrons equal to
In a neutral atom, the number of electrons equal to the number of protons
Which representation of a hydrogen molecule is not correct?
Hydrogen is the element with atomic number one. The representation of the hydrogen molecule with a double bond is incorrect.
What is a double bond?A double bond is a type of chemical bond that involves two pairs or four bonding electrons of the atom in a molecule. They are stronger and shorter bonds compared to single bonds.
A hydrogen molecule can never have a double bond in its molecule as it has only a single electron in its shell and cannot form a double bond due to the lack of four electrons.
Therefore, hydrogen molecules cannot form a double bond.
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How does the adaptations of a giraffe help survive its environment
Answer:
"They drink water when it is aivailable but can go weeks without it, they rely on morning dew and the water content of their food". they can use plants as resources to live.
What does global warming have to do with severe weather like storms heat waves droughts and hurricanes
Answer:
A rise in global temperatures increases the severity and likelihood of storms, floods,wildfires, droughts, and heat waves
Explanation:
no explanation please tag me as brainleast thankyou
The law that relates the temperature and volume of a gas to each other is known as.
What are the ways that energy
conversion can occur?
Answer:
Energy can exist in many forms within a system and may be converted from one form to another within the constraint of the conservation law. These different forms include gravitational, kinetic, thermal, elastic, electrical, chemical, radiant, nuclear, and mass energy.
Explanation:
What is the total temperature change if a 0.87g piece of aluminum absorbs 32.3J of energy? _____ oC
Answer:
41.25
Explanation:
I am not sure if your teacher expects you to just find specific heat yourself, but if they do answer it using as below:
Quick search shows aluminium specific heat is 0.90 J/gC.
use formula: q = mcΔT (q = heat, m= mass, c= specific heat, ΔT is temperature change)
q = mcΔT
q/(mc) = ΔT
32.3/(0.87 x 0.90) = ΔT
ΔT = 41.25 C
What is the mole fraction of sodium chloride in solution that is 13. 0 y mass sodium chloride and that has a density of 1. 10 g/ml?
Mole fraction is the ratio of the constituent moles to the total constituents. The mole fraction of sodium chloride is 0.0443.
What is a mole fraction?A mole fraction is the proportion of the moles of the component in a total component present.
In 100 gm of solution 13.0 5 means, there is 13.0 gm of sodium chloride present. The mass of water is calculated as,
100 - 13.0 = 87.0 gm
Moles of sodium chloride is calculated as:
[tex]\begin{aligned} \rm moles &= \rm \dfrac{mass}{molar\; mass} \\\\&= \dfrac{13}{58}\\\\&= 0.224 \;\rm moles\end{aligned}[/tex]
Moles of water are calculated as:
[tex]\begin{aligned} \rm moles &= \rm \dfrac{mass}{molar\; mass} \\\\&= \dfrac{87}{18}\\\\&= 4.83\;\rm moles\end{aligned}[/tex]
Now, moles fraction is calculated by dividing moles of sodium chloride by total moles as,
[tex]\begin{aligned} \text{Mole fraction of NaCl} &= \dfrac{0.224}{0.224 + 4.83}\\\\&= 0.0443\end{aligned}[/tex]
Therefore, the mole fraction of sodium chloride is 0.0443.
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Help help help help help
1. double replacement[two of the chemical species(B and D)exchanged positions]
2. Combustion(the reaction with oxygen produced CO2 and water; products of Combustion)
3. Single replacement(only one chemical specie[B] exchanged position)
4. Combination(the two reactants formed a single product)
5. Decomposition(a compound released two constituent products)
6. 1PbCl2 + 2AgNO3 = 1Pb(NO3)2 + 2AgCl. it is a double replacement reaction since two chemical species(Chlorine(Cl) and Nitrogen(iii)oxide[NO3]) exchanged positions.
7. 1NH3 + HCL = NH4Cl. it is a combination reaction since two reactants formed a single product.
8. 2AlCl3 + 3Na2SO4 = 1Al(SO4)3 + 6NaCl. it is a double replacement reaction since two chemical species(chlorine[Cl] and sulphate[SO4]) exchanged positions.
9. 1Zn + 1S = 1ZnS. it is a combination reaction since two reactants formed a single product.
10. 1Al2(SO4)3 + 3BACl2 = 3BASO4 + 2ALCL3. it is a double replacement reaction since two chemical species(chlorine[Cl] and sulphate[SO4]) exchanged positions.
11. 1Al2S3 = 2Al + 3S. it is a decomposition reaction since a reactant released two constituent products.
12. 1H2SO4 + 1Fe = 1H2 + 1FeSO4. it is a single replacement reaction since one chemical specie(sulphate[SO4]) exchanged position.
13. C12H22O11 + 12O2 = 12CO2 + 11H2O. it is a combustion reaction since a reactant combined with oxygen to release carbon dioxide(CO2) and water(H2O).
14. 1Mg(OH)2 + 1H2SO4 = 1MgSO4 + 2H2O. it is a double replacement reaction since two chemical species(hydroxide[OH] and sulphate[SO4]) exchanged positions.
15. 2NaOH + 1CuSO4 = Na2SO4 + Cu(OH)2. it is a double replacement reaction since two chemical species(hydroxide[OH] and sulphate[SO4]) exchanged positions.
16. 1C4H12 + 7O2 = 6H2O + 4CO2. it is a combustion reaction since a reactant combined with oxygen to release carbon dioxide(CO2) and water(H2O).
17. 4Fe + 3O2 = 2Fe2O3. it is a combination reaction since two reactants formed a single product.
18. 1Mg3(PO4)2 + 3H2 = 3Mg + 2H3PO4. it is a single replacement reaction since one chemical specie(phosphate[PO4]) exchanged position.
19. 2NH4NO3 = 2N2O + 4H2O. it is a decomposition reaction since a reactant released two constituent products.
20. 1Cl2 + 2KBr = 2KCl + 1Br2. it is a single replacement reaction since one chemical specie(potassium[K]) exchanged position.
Please help
Calculate the molarity of an HCl solution if 41.73 mL of HCl reacts with 7.8111 grams of sodium carbonate (106 g/mol) according to
2 HCl + Na2CO3 → 2 NaCl + H2O + CO2
Answer in units of mol/L.
The molarity of an HCl solution if 41.73 mL of HCl reacts with 7.8111 grams of sodium carbonate is 1.77M. Details about molarity can be found below.
How to calculate molarity?The molarity of a solution can be calculated by dividing the number of moles of the substance by its volume.
According to this question, 7.8111 grams of sodium carbonate (106 g/mol) is given. The number of moles of sodium carbonate is calculated as follows:
no of moles = 7.811g ÷ 106g/mol = 0.074mol
Molarity of HCl = 0.074mol ÷ 0.04173L
Molarity of HCl = 1.77M
Therefore, the molarity of an HCl solution if 41.73 mL of HCl reacts with 7.8111 grams of sodium carbonate is 1.77M.
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