The amount of heat energy lost by the 100 mL of water when it all freezes is 33400 J
Data obtained from the question Volume of water = 100 mL Heat (Q) =? How to determine mass of water Volume of water = 100 mL Density of water = 1 g/mL Mass of water =?
Mass = Density ×Volume
Mass of water = 1 × 100
Mass of water = 100 g
How to determine the heat Mass of water = 100 gHeat of fusion (ΔHf) = 334 J/g Heat (Q) =?Q = m × ΔHf
Q = 100 × 334
Q = 33400 J
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Which of the following reactions can also be termed as thermal decomposition reaction?
(a) Combination Reaction
(b) Decomposition Reaction
(c) Displacement reaction
(d) Double displacement reaction
Answer:
Decomposition reaction
Explanation:
When a single reactant is decomposed into two or more products that reaction is called decomposition reaction.
Thermal decomposition usually refers to exothermic reactionA lots of amount of heat is released in thisOption B is correct
How many potassium ions are needed to bond with a phosphate ion?.
Explain why the amino group of p-aminobenzoic acid does not participate in the reaction
This is because amino group of p-aminobenzoic acid is an aniline and is less electrophilic than an alkyl amine.
What is an Aniline?This is an aromatic amine which consists of a phenyl group attached to an amino group.
The amino group of p-aminobenzoic acid being an aniline makes it less electrophilic which is why an alkyl amine participates in the reaction instead.
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The amino group of p-aminobenzoic acid does not participate in the reaction as this is an aniline and is less electrophilic than an alkyl amine.
What is an Aniline?Aniline is an aromatic amine molecule in which phenyl group is attached with an amino group.
The amino group present in the p-aminobenzoic acid behave as an aniline as a result of which it becomes less electrophilic in nature and this is the reason why an alkyl amine participates in the reaction instead of the p-aminobenzoic acid.
Hence amino group of p-aminobenzoic acid is less electrophilic in nature and that's why not participate in the reaction.
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What do the neural pathways for taste, hearing, sight, and touch have in common
Answer:
All of the signals pass through the thalamus
Explanation:
How many molecules are in 12.8 moles of CO2?
A. 563 molecules
B. 0.291 molecules
C. 2.13 x 10^{-23} molecules
D. 7.71 x 10^{24} molecules
Answer: D. 7.71 x 10^24
Explanation:
12.8 moles CO2 (6.02 * 10^23 molecules / 1 mol) = 7.7 * 10^24 molecules :)
Two posssible lewis structures for the molecule ch2s are given. determine the formal charge on each atom in both structures
The formal charge on each atom can be known by counting up the number of valence electrons that is present on each atom.
What is Lewis structure?The term Lewis structure is the representation of a compound using its symbols and showing the valence electrons as dots. This question is incomplete as the Lewis structures were not shown.
If it is shown, we can know the formal charge on each atom by counting up the number of valence electrons that is present on each atom.
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Tear off a small, flat sheet of waxed paper. Use the pipette to dispense a drop of water on the waxed paper. Now, dry the pipette, and use it to dispense a drop of oil on the waxed paper next to the water drop. Be sure the two drops are not touching. Compare and describe the appearance of both drops.
Answer:
Explanation:
When comparing the drops of oil and water, one thing I noticed was the shape. The water drop was more defined, whereas the drop of oil began to spread and was much flatter. This may be due to the waxy material, and how both oil and water react to the wax.
A 1.775g sample mixture of potassium hydrogen carbonate is decomposed by heating. if the mass loss is 0.275g what is the percentage of khco3
A 1.775g sample mixture of KHCO₃ is decomposed by heating. if the mass loss is 0.275g, the mass percentage of KHCO₃ is 70.4%.
What is a decomposition reaction?A decomposition reaction can be defined as a chemical reaction in which one reactant breaks down into two or more products.
Step 1: Write the balanced equation for the decomposition of KHCO₃.2 KHCO₃(s) → K₂CO₃(s) + CO₂(g) + H₂O(l)
The mass loss of 0.275 g is due to the gaseous CO₂ that escapes the sample.
Step 2: Calculate the mass of KHCO₃ that formed 0.275 g of CO₂.In the balanced equation, the mass ratio of KHCO₃ to CO₂ is 200.24:44.01.
0.275 g CO₂ × 200.24 g KHCO₃/44.01 g CO₂ = 1.25 g KHCO₃
Step 3: Calculate the mass percentage of KHCO₃ in the sample.There are 1.25 g of KHCO₃ in the 1.775 g sample.
%KHCO₃ = 1.25 g/1.775 g × 100% = 70.4%
A 1.775g sample mixture of KHCO₃ is decomposed by heating. if the mass loss is 0.275g, the mass percentage of KHCO₃ is 70.4%.
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Strong bases are ____________ of group ____________ metals (ex. ____________ ) or larger group ____________ metals (ex. ____________ ), or oxides of the same metals.
The strong bases are hydroxides of group 1 and 2 metals (ex. Sodium, Potassium) or larger group transition metals (Copper, Iron), or oxides of the same metals.
Strong bases formulationIt follows from structure of strong bases that they are composed of highly electropositive metals of groups 1 and 2 and the hydroxide ion.
Additionally, transition metals may also form bases with the hydroxide ion or oxides of this transition metals.
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help Light reflecting from the aluminum coating on a CD ____________ and then interferes.
A. Diffracts
B. Refracts
C. Vibration
D. Reflection
Answer:
Reflection
Hope it will help you
The distance between a carbon atom and an oxygen atom in the co molecule is how far from the carbon atom is the center of mass of the molecule?
Answer:
1.12x10-10 or 0.63 ewan
Explanation:
Correct option is C)
The distance of centre of mass from carbon atom is,
xcm=m1+m2m1x1+m2x2
=12+1612×0+16×1.1
=0.63A˚
Thus, the centre of mass is 0.63A˚ from carbon atom.
The distance between a carbon atom and an oxygen atom in the co molecule is 0.63
What is the distance?Distance is the measurement of the farness of two objects from each other.
The distance between the molecules can be calculated by the given formula
[tex]xcm = m_1+m_2m_1\times 1+m_2 \times 2[/tex]
Putting the values in the equation
[tex]xcm = 12+1612 \times 0+16 \times 1.1 = 0.63 A^\circ[/tex]
Thus, the distance between a carbon atom and an oxygen atom in the co molecule is 0.63
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what describes the equivalence point on a graph of pH versus the amount of titrant added to a solution
Answer:
Titrant and analyte is a pair of acid and base. ... Equivalence point: point in titration at which the amount of titrant added is just enough to completely neutralize the analyte solution. At the equivalence point in an acid-base titration, moles of base = moles of acid and the solution only contains salt and water.
Explanation:
After completing their tests, the students make recommendations on how to increase the final temperature of the
mixture
Based on the data in the table, select if the proposed improvements would increase or decrease the final
emperature of the mixture. Place a check mark in the appropriate box in each row.
Answer: test two
Explanation: it sits in between both
One mole of copper atoms is 6.02 x 1023 copper atoms.
True or false?
Answer:
Explanation:
The relation between molecular (formula) mass and molar mass page 44 . To obtain one mole of copper atoms (6.20 x 1023 ne atoms) weigh out 63.55 g copper. The molar mass (M) of a substance is the mass of one mole of entities (atoms, molecules, or formula units) of the substance.
What is the minimum quantity of energy that must be possessed by the reactants for a reaction to occur?
Group of answer choices
Collision model
Thermal energy
Catalyst
Activation energy
Answer:
Activation energy :)
Explanation:
The activation energy starts the reaction! Without it, we would not find out the solution!
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Ancient
grew to 40 m, but are smaller today.
Answer:
Club mosses
Explanation:
hope this helps
Stirring iced tea mix into water is a chemical change?
Answer:
true
Explanation:
it changes the chemicals in the water and adds new ones
(PLEASE ANSWER!)
2H20 + 2Na --> 2NaOH + H2
which of these is a reactant in this chemical reaction?
A. hydrogen
B. nitrogen
C. oxygen
D. water
Answer:
Water (H2O) and Sodium (Na) are reactants.
Explanation:
2H2O+2Na......2NaOH+H2
In the above reaction the water (H2O) and sodium (Na) are reactants and sodium hydroxide (NaOH) and hydrogen are products.
And this is the single displacement reaction.
How does this visual help to explain hazards from volcanoes that can hurt people even when they are not erupting?
Answer:
The visual seems to be showcasing an erupting volcano, so I don't believe the two are related.
Explanation:
hello people~
Polyethylene terephthalate belongs to which class of synthetic polymer?
A. None of these
B. Polyolefin
C. Nylon
D. Polyester
Answer:
Polyester
Explanation:
Polyethylene terephthalate or shortly known as PET its a clean and strong polyesterIt is used in packagingQuestion 6 of 10
Which of these accurately describes a difference between nuclear energy and
fossil fuel?
O A. In nuclear fuel reactions, heat is released that is used to do work.
O B. Nuclear fuel has a higher energy density than fossil fuels.
O C. Fossil fuels have a higher energy density than nuclear fuel.
O D. In fossil fuel reactions, heat is released that is used to do work.
Answer:
b. nuclear fuel has a higher energy density than fossil fuels.
Explanation:
Nuclear fuel is a quantity of energy measured in joules; therefore, it has the same units as electrical and mechanical energy.
Which ion combines with ba2 to form a compound that is most soluble in water
Answer:
(2) OH- is the answer.
Explanation:
Hope this helps:)...if not then sorry for wasting your time and may God bless you:)
The ions that combine with Ba2 to form the compound most soluble in water is OH- ion.
What is barium?Barium is a chemical element with atomic number 58.
Barium reacts with the hydroxide ion to form barium hydroxide. It is also called baryta water.
The reaction is [tex]Ba^2^+ aq + 2OH^- \rightarrow Ba(OH)_2 (aq)[/tex]
Thus, the ions that combine with Ba2 to form the compound most soluble in water is OH- ion.
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Write some of the chemical and physical properties and uses of each natural resource shown in the photos below.
Can you store cuso4 in an aluminum container? explain your reasoning
We can store the copper sulphate solution in alumiun container, if cover on alumiun is present.
Can you store cuso4 in an aluminum container?Aluminium is more reactive than copper so the Aluminium will displace copper sulphate from its solution by reacting with it but if there is cover on the aluminium then the alumium can't react with copper.
So we can store the copper sulphate solution in alumiun container.
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No, we cannot store CuSO₄ in an aluminum container because aluminum will displace the copper present in the solution.
Why do different chemicals require different containers?Different chemicals are put in different containers, usually glass, plastic, dark container, or light container.
Chemicals element are reactive to different substances and to each other.
That's why they are put in separate and different types of containers according to their reactivity.
Thus, No, we cannot store CuSO₄ in an aluminum container because aluminum will displace the copper present in the solution.
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What is the Electronegativity difference of C and S?
Answer:
S 2.6 [2.58] & C is 2.6 [2.55]
Explanation:
Compared to the nucleus 5626fe, what is the density of the nucleus 112 48cd?
For a comparison of the nucleus 5626fe, the density of the nucleus 112 48cd is mathematically given as the same.
n(Cd) / n(Fe)=1
What is the density of the nucleus 112 48cd?Generally, the equation for the density is mathematically given as
d=\frac{A}{4/3}\piR^3
Therefore
n(Cd) / n(Fe) = [A (Cd) / (A Fe) ] * [ R (Fe) / R (Cd)]^3
n(Cd) / n(Fe)= (112 / 56 ) * (1/1.26)3
n(Cd) / n(Fe)=1
In conclusion, The ratio of n(Cd) = n(Fe) is 1, hence same
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Compared to the nucleus ⁵⁶₂₆Fe, the density of the nucleus ¹¹²₄₈Cd is same.
How do we calculate the density of nucleus?Density of any nucleus will be calculated by using the below equation as:
ρ = m/V, where
m = mass of the atom
V = volume = 4/3πR³
For the given question calculation will be proceed as:
n(Cd) / n(Fe) = [m(Cd)/m(Fe)].[R(Fe)/R(Cd)]³
From the given formulas of iron and cadmuim we put values on the above equation then we get,
n(Cd) / n(Fe) = (112 / 56 ) × (1/1.26)3
n(Cd) / n(Fe) = 1
Hence the density of nucleus ¹¹²₄₈Cd is same as of nucleus ⁵⁶₂₆Fe nucleus.
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I have 5 questions that need help to answer 1) What are covalent bonds and how do they form ? 2) How do you know which elements and how many of each are in a compound ?
3) How can you find how many valence electrons an atom has ?
4) How many valence electrons do atoms need to be happy? Which elements are the exceptions?
Answer:
covalent bond- a chemical bond that is the sharing of electron pairs between atoms
In the electroplating of nickel, 0. 200 faraday of electrical charge is passed through a solution of niso4. What mass of nickel is deposited?.
The mass of nickel, Ni deposited when 0.2 faraday of electrical charge is passed through a solution of NiSO₄ is 5.9 g
Balanced equationNi²⁺ + 2e —> Ni
Molar mass of Ni = 59 g/mol
Mass of Ni from the balanced equation = 1 × 59 = 59 g
Number of faraday = 2
SUMMARY
From the balanced equation above,
2 faraday deposited 59 g of Nickel
How to determine the mass of nickel depositedFrom the balanced equation above,
2 faraday deposited 59 g of Nickel
Therefore,
0.2 faraday will deposit = (0.2 × 59) / 2 = 5.9 g of Nickel
Thus, 5.9 g of Nickel were deposited in the process
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Answer:
5.9 grams
Explanation:
You need 2 faraday to deposit 1 mole of Ni (59 grams) because there are 2 moles of electrons in equation:
Ni+2 + 2e- --> Ni(s)
So, 0.2 faraday will deposit 1/10 of that or 5.9 grams of Ni(s).
A chemical reaction needs to occur at a certain temperature, but one liquid is coming from a reactor at a much hotter temperature. what might be used to cool the liquid? question 3 options: cooling pool steam turbine heat exchanger boiler
The medium that might be used to cool the hot liquid coming from a reactor is : ( C ) Heat exchanger
Function of the heat exchangerHeat exchanger is used for the transfer of heat between liquids to be used in a chemical reaction, It can be used for both Cooling and heating to achieve the desired temperature.
The liquid coming from a reactor which posses a very high temperature will be passed through the heat exchanger so that its temperature will attain the required temperature for the experiment.
Hence we can conclude that The medium that might be used to cool the hot liquid coming from a reactor is Heat exchanger.
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Which images show chemical reactions?
Explanation:
image 3 and 4show chemical reactionsAnswer:
image 3 and 4show chemical reactions
Explanation: