Answer:
The right approach is "80 g".
Explanation:
Given:
[tex]L_f=80 \ Cal/g[/tex]
[tex]L_v=540 \ Cal/g[/tex]
[tex]S=1 \ Cal/g[/tex]
Now,
The amount of heat cooling will be:
= [tex]mL_v+mS \Delta T[/tex]
= [tex](10\times 540)+10\times 1\times (100-0)[/tex]
= [tex]5400+1000[/tex]
= [tex]6400 \ Cal[/tex]
then,
⇒ [tex]m_{ice} L_f=6400[/tex]
[tex]m_{ice}\times 80=6400[/tex]
[tex]m_{ice}=\frac{6400}{80}[/tex]
[tex]=80 \ g[/tex]
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1. Which point defect in its crystal units alters the density of a solid?
Please answer
Schottky defects in its crystal units alters the density of a solid!
If one neutron initiates a fission event that produces two neutrons in the products, how many new reactions can now be initiated? 9 If each of the neutrons produced in the first fission event then initiates a fission event that produces one neutron in the products, how many new reactions can now be initiated by each neutron? How many neutrons in total were produced by the two fission events described?
Answer:
See Explanation
Explanation:
A fission reaction is a chain reaction. The neutrons that are produced in one reaction leads to further chain reaction in the system.
If one neutron initiates fission that leads to the production of two other neutrons,two more new reactions are initiated.
If these reactions each produce one neutron, then another two new reactions are initiated. This makes a total of four new reactions from the two fission events described.
A total of four neutrons is produced from the two fission events.
Answer:
If one neutron initiates a fission event that produces two neutrons in the products, how many new reactions can now be initiated?
2
If each of the neutrons produced in the first fission event then initiates a fission event that produces one neutron in the products, how many new reactions can now be initiated by each neutron?
1
How many neutrons in total were produced by the two fission events described?
4
Explanation:
Got it correct on Edge.
A solution is made by adding 23.1 mL of concentrated nitric acid ( 70.4 wt% , density 1.42 g/mL ) to some water in a volumetric flask, and then adding water to the mark to make exactly 200 mL of solution. Calculate the concentration of this solution in molarity.
Answer:
The correct solution is "3.6975 M".
Explanation:
The given values are:
Volume of solution,
V = 23.2 mL
Density,
D = 1.42 g/mL
Final volume,
= 200 mL
or,
= 0.2 L
Now,
The mass will be:
= [tex]D\times V[/tex]
= [tex]1.42\times 23.1[/tex]
= [tex]32.802 \ g[/tex]
Mass of HNO₃ will be:
= [tex]\frac{32.802}{0.704}[/tex]
= [tex]46.59375 \ g[/tex]
Mol of HNO₃ will be:
= [tex]\frac{mass}{MW}[/tex]
= [tex]\frac{46.59375}{63}[/tex]
= [tex]0.7395 \ mol[/tex]
hence,
The concentration will be:
= [tex]\frac{mol \ of \ HNO_3}{final \ V}[/tex]
= [tex]\frac{0.7395}{0.2}[/tex]
= [tex]3.6975 \ M[/tex]
If the atomic number of an element is 14, the identity of the element must be
A. Nitrogen
B. Silicon
C. Carbon
D. Niobium
Answer:
silicon
Explanation:
because silicon has 14 electrons and protons
A silver nitrate solution is mixed with a potassium bromide solution. The most likely precipitate formed is:
Answer: Silver bromide
Explanation: AgNO3 + KBr — AgBr + KNO3
does iodine occur naturally in salt ? yes or no
Answer:
[tex]yes[/tex]
Explanation:
Iodine is present in salt which makes it salty:)
Statement which represents following chemical reaction.
Answer:
Third option is the correct answer
Explanation:
A solution of sodium chloride and a precipitate of barium sulphate is formed.
Which is the best definition of a CHARACTERISTC physical property?
how do the biosphere and geosphere interact? give an example
Answer:
Plants
Explanation:
Plants, part of the biosphere, grow in the soil, which is part of the geosphere
hope this helped :)
I need help with my chemistry but you can oonly choose one option
Answer:
well it is an Synthesis reaction
Explanation:
in the view of the fact that a sodium metal .."Sodium" reacts with an "chloride gas" to form a sodium Chloride. NaCL2NaCl-->2Na+ Cl2
Correct Option- Decomposition
_____________________________
Decomposition reactions are those reactions in which a compound breaks or splits into two or more simpler substances. In such reactions, one reactant breaks down to form many i.e. at least two products. These reactions require energy to break existing bonds, so they take place in the presence of heat, light, or electricity.
Example:- AB--> A+B
Hope This Helps You ❤️When an acetic acid solution is titrated with sodium hydroxide, the slope of the titration curve (pH versus volume of NaOH added) increases when sodium hydroxide is first added. This change shows that ________
Answer:
When an acetic acid solution is titrated with sodium hydroxide, the slope of the titration curve (pH versus volume of NaOH added) increases when sodium hydroxide is first added. This change shows that acetic acid is being converted to sodium acetate.
Explanation:
ABOUT TITRATION - Titration is a chemical analysis method for determining the amount of a constituent in a sample by adding an exact known quantity of another substance to the measured sample with which the desired constituent reacts in a specific, known proportion. A burette, which is essentially a long, graduated measuring tube with a stopcock and a delivery tube at the bottom end, is used to gradually administer a standard solution of titrating reagent, or titrant.
It is feasible to identify a good visual color indicator for many titration processes that will signify the end point at, or very near to, the equivalence point.
Acid-base titrations, precipitation titrations, complex-formation titrations, and oxidation-reduction (redox) titrations are examples of such titrations, which are categorised according to the nature of the chemical reaction that occurs between the sample and the titrant.
Titrations of metal ions with the reagent disodium ethylenediaminetetraacetate are the most important titrations based on complex-formation processes (a salt of edetic acid, or EDTA).
Hence , the answer is that acetic acid is converted into sodium acetate.
Plz answer with photo
I need answer just with the form ♀️
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Please Final Exam Question What is the location of the highest energy electron in a neutral, ground-state sodlum atom?
energy level 1
energy level 2
energy level 3
energy level 4
Answer: third energy level
Explanation: In a sodium atom, the highest-energy principal energy level containing electrons is the third energy level, and that energy level contains one electron.
Which is considered a good insulator of heat? *
1 point
Captionless Image
A. aluminum, because it allows heat to flow easily.
B. glass, because it allows heat to flow easily.
C. plastic, because heat is unable to flow easily through it.
Answer: Aluminum, because it allows heat to flow easily.
Have a nice day!
A cyclist travels 60 km in 2 hours .What is his average speed?
Explanation:
Mike drives his car 60 km in 55minutes. What is its average speed in kilometers per hour ? A train travels 120 km in 2 hours and 30 .
Element X has two naturally occurring isotopes, 65X (isotopic mass 65.3410 amu, abundance 31.87%) and 67X (isotopic mass 66.9519 amu, abundance 68.13%). Calculate the atomic mass of element X.
Answer:
[tex]m_X=66.4385amu[/tex]
Explanation:
Hello there!
In this case, according to the given information for this problem, it turns out possible for us to calculate the average atomic mass of the element by multiplying the mass of each isotope by its percent abundance and then add up the results, just as shown below:
[tex]65.3410amu*0.3187=20.8242amu\\\\66.9519amu*0.6813=45.6143amu\\\\m_X=20.8242amu+45.6143amu\\\\m_X=66.4385amu[/tex]
Regards!
What factors determine how fast a solute will dissolve?
Explanation:
Factors which determine how fast a solute will dissolve are as follows.
1). Surface area of dissolving particles - More is the surface area of dissolving particles available more it will come in contact with high number of particles. As a result, more interaction causes more collision between particles due to which more solute will dissolve in solvent.
2). Stirring - More stirring in a solution will lead to more number of collisions between the particles. Hence, more solute particles will dissolve in it.
3). Temperature - More is the temperature provided to solution more will be kinetic energy of its particles. This causes more collisions and therefore, more dissolution of solute particles in the solvent will take place.
What is baking soda chemically known as ? Excessive use of chemical
fertilizer is not good. Justify.
Answer:
Baking Soda is NaHCO3 ---Sodium hydrogen Carbonate
Excessive use of Fertilizer can cause plants to develop shallow root systems,Decrease soil fertility and reduce Quality of Crops.
Answer:
Sodium bicarbonate, also called sodium hydrogen carbonate, or bicarbonate of soda, is a source of carbon dioxide and so is used as an ingredient in baking powders, in effervescent salts and beverages, and as the main constituent of dry-chemical fire extinguishers.
Explanation:
Why will no one help this is bogus
Answer:
D
Explanation:
If carbon can count the shared hydrogen
atoms for itself, how many electrons are
now in carbon's outer orbital?
Answer:
Mars and Orbital code saber and the alien
Given 32.0 g of water, if we see a temperature change from 25.0°C to 20.0°C, then how much heat energy (q) is transferred from the water?
(The specific heat of water is 4.184 J/g°C )
Answer:
Q = 669.44 J
Explanation:
Given that,
Mass of water, m = 32 g
The temperature change from 25.0°C to 20.0°C.
We need to find the amount of heat energy transferred. Let it is Q. We know that,
[tex]Q=mc\Delta T[/tex]
Where
c is the specific heat of water
Put all the values,
[tex]Q=32\times 4.184 \times (20-25)\\Q=669.44\ J[/tex]
So, 669.44 J of heat energy is transferred from the water.
scenario Juan and Maria Lopez wish to invest in a no-risk savings account. They currently have 530,000 in an account bearing 5.25 % annual interest, compounded continuously. The following options are available to them.
Answer:
The amount after three year is 617934.1302
Explanation:
Complete question
A person places $530,000 in an investment account earning an annual rate of 5.25%, compounded continuously. Using the formula V = Pe^{rt}V=Pe rt , where V is the value of the account in t years, P is the principal initially invested, e is the base of a natural logarithm, and r is the rate of interest, determine the amount of money, to the nearest cent, in the account after 3 years
Solution
The formula for calculating compound interest is
[tex]A = p (1 + \frac{r}{n})^{nt}[/tex]
Substituting the given values we get -
[tex]A = 530,000 (1 + \frac{5.25}{100})^3\\A = 530,000 * ( 1+ 0.0525)^3\\A = 530,000 * ( 1.0525)^3\\A = 617934.1302[/tex]
The amount after three year is 617934.1302
A 1.0 kg bottle of sodium carbonate (Na2CO3, 106.0 g/mol) is available to clean up 5.00 liters of spilled concentrated aqueous hydrochloric acid (9.75 M). Is this enough sodium carbonate to neutralize the acid according to the following reaction?
2 HCl (aq) + Na2CO3 (s) 2NaCl (aq) + CO2 (g) + H2O (l)
(1) No, there is approximately 40% too small amount of sodium carbonate needed.
(2) Yes, there is approximately 80% more than what is needed.
(3) No, there is approximately 60% too small amount of sodium carbonate needed.
(4) Yes, there is exactly enough sodium carbonate, but no excess.
(5) No, there is approximately 20% too small amount of sodium carbonate needed.
Answer:
The correct answer is option 4, that is, there is exactly enough sodium carbonate.
Explanation:
Based on the given question, the reaction will be,
2 HCl (aq) + Na2CO3 (s) ⇒ 2 NaCl (aq) + CO2 (g) + H2O (l)
Therefore, for neutralizing 2 moles of HCl, one mole of Na2CO3 is required.
No of moles present in 1 Kg or 1000 grams of Na2CO3 will be,
Moles = Weight/Molecular mass of Na2CO3
Moles = 1000 / 106 = 9.43
Thus, 9.43 moles of Na2CO3 is present.
No of moles present in 1 liter of 9.75 M HCl is 9.75.
No. of moles present in 5 Liters of HCl (9.75 M),
= 5 × 9.75 = 48.75
Thus, for 2 moles of HCl 1 mole of Na2CO3 is required. Now for 48.75 moles of HCl, the moles required of Na2CO3 is 9.75. Therefore, for complete neutralization, the moles of Na2CO3 required is 9.75, and the present moles is 9.43.
Hence, there is exactly enough sodium carbonate.
A sample of a gas has a volume of 852 mL at 298 K. If the gas is cooled to 200K, what would the new volume be?
Answer:
571.81 mL
Explanation:
Assuming constant pressure, we can solve this problem by using Charles' law, which states that at constant pressure:
V₁T₂=V₂T₁Where in this case:
V₁ = 852 mLT₂ = 200 KV₂ = ?T₁ = 298 KWe input the data:
852 mL * 200 K = V₂ * 298 KAnd solve for V₂:
V₂ = 571.81 mLThe new volume would be 571.81 mL.
Hydration of alkynes gives good yields of single compounds only with symmetrical or terminal alkynes. Draw the major organic product(s) formed when 3-methylcyclodecyne undergoes hydration in the presence of HgSO4 and H2SO4.
Answer:
Following are the solution to the given choice:
Explanation:
Hex-2-yne is just not alkyne symmetric, therefore two things respectively hexan-3-one and hexan-2-one are to be given.
The attached file it displayed the response along with the mechanism, please find the.
If atoms are electrically neutral then how do they form bonds?
Answer:
The nucleus contains neutrons and protons; protons carry the positive charge. The shells contain electrons which carry the negative charge. So, how can the atom be changed. ... Covalent bonds are electrically neutral because they are not formed due to the transfer of electrons but sharing of electrons.Explanation:
Hope it helps ^-^
#CarryOnLearning
Answer:
When an atom has an equal number of electrons and protons, it has an equal number of negative electric charges (the electrons) and positive electric charges (the protons). The total electric charge of the atom is therefore zero and the atom is said to be neutral. ... Chemically, we say that the atoms have formed bonds
Can someone help me with a bio organic questions??♀️
A gas has a solubility of 0.66 g/L at 10.0 atm. What is the pressure on a 1.0 L samples that contains 1.5 g of gas
Answer:
"22.73 atm" is the correct answer.
Explanation:
Given:
Solubility,
[tex]S_1=0.66 \ g/L[/tex]
[tex]S_2=1.5 \ g/L[/tex]
Pressure,
[tex]P_1=10.0 \ atm[/tex]
[tex]P_2=?[/tex]
By using Henry's law,
⇒ [tex]\frac{S_1}{P_1} =\frac{S_2}{P_2}[/tex]
or,
⇒ [tex]P_2=\frac{S_2 P_1}{S_1}[/tex]
By putting the values, we get
⇒ [tex]=\frac{1.5\times 10.0}{0.66}[/tex]
⇒ [tex]=\frac{15}{0.66}[/tex]
⇒ [tex]=22.73\ atm[/tex]
A precipitate forms when mixing solutions of sodium fluoride (NaF) and lead II nitrate (Pb(NO3)2). Complete and balance the net ionic equation for this reaction by filling in the blanks. The phase symbols and charges on species are already provided.
Complete and balance the net ionic equation for this reaction.
Answer:
See explanation
Explanation:
The molecular equation shows all the compounds involved in the reaction.
The molecular equation is as follows;
2NaF(aq) + Pb(NO3)2(aq) -------> PbF2(s) + 2NaNO3(aq)
The complete ionic equation shows all the ions involved in the reaction
The complete ionic equation;
2Na^+(aq) + 2F^-(aq) + Pb^2+(aq) + 2NO3^-(aq) -------->PbF(s) + 2Na^+(aq) +2NO3^-(aq)
The net Ionic equation shows the ions that actually participated in the reaction
The net ionic equation is;
2F^-(aq) + Pb^2+(aq)--------> PbF(s)
Write the formulas for each of the compounds in the following table.
1.
Ferric sulfate
2.
Strontium oxalate
3
.
Chromic acid
4.
Nickel(III) carbonate
5.
Silver bromate
6
.
Dinitrogen difluoride
1.
Magnesium molybdate
8.
Sodium hydrogen phosphate
Answer:
1. Ferric sulfate - Fe2(SO4)3
2. Strontium oxalate – SrC2O4
3. Chromic acid – CrO3
4. Nickel (III) carbonate – NiCO3
5. Silver bromate – AgBrO3
6. Dinitrogen difluoride - N2H2
7. Magnesium molybdate – MgMoO4
8. Sodium hydrogen phosphate - Na2PO4