When the color changes is it a chemical change or a physical change
physical
It can be chemical but it's usually physical as the molecular structure doesn't change
If 32.00 mL of a solution of Ca(OH)2 requires 16.08 mL of a 2.303 M solution of HNO2 for complete titration, what is the molarity of the Ca(OH)2 solution?
For the equilibrium that exists in an aqueous solution of nitrous acid ... calcium hydroxide is dissolved in water until the pH of the solution is 11.44.
Calculate the specific heat in J/(g·ºC) of an unknown substance if a 2.50-g sample releases 12.0 cal as its temperature changes from 25.0ºC to 20.0ºC. ________J/(g·°C)
The specific heat of an unknown substance is 0.96 J/(g·ºC).
What is the specific heat capacity?The specific heat capacity of a substance can be described as the quantity of heat needed to raise the temperature in one unit of substance by 1 degree Celcius.
Whenever the heat is lost or absorbed there is a change in the temperature of the substance:
Q = mCΔT
Given, the amount of energy released, Q = 12 cal
The initial temperature of the substance = 25.0ºC
The final temperature of the substance = 20.0ºC
The change in the temperature of a substance, ΔT = 25 -20 = 5°C
The mass of the substance, m = 2.50 g
We have to find the specific heat capacity of an unknown substance.
12 cal = 2.50 g × C × 5°C
C = 0.96 J/(g·ºC)
Therefore, the specific heat capacity of an unknown substance is equal to 0.96 J/(g·ºC).
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The amount of heat needed to raise a substance's temperature by one degree Celsius per gram is known as specific heat. The specific heat in J/(gºC) of an unknown substance is 0.96 J/gºC.
The amount of heat needed to increase the temperature of the entire substance by one degree is the heat capacity of a substance. Specific heat capacity is what is used when the substance's mass is equal to one.
The hydrogen bonds in water, which account for its high specific heat.
The expression used to calculate the specific heat capacity is:
Q = mcΔT
Here Q = 12 Cal
m = 2.50 g
T₁ = 25.0ºC
T₂ = 20.0ºC
ΔT = 5°C
12 cal = 2.50 g × c × 5°C
c = 0.96 J/gºC
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What conversion factor would be used to solve the following problem:
Convert 8.99g of CO2 to moles of CO2
A) Molecular weight
B) Avogadro's number
C) Grams
D) Density
A) Molecular weight (MW)
moles = mass : MW
Which form of water is classified as part of the precipitation phase of the water cycle?
A:lakes
B:vapor
C:rivers
D:snow
Answer:
Snow
Explanation:
Precipitation means when water falls from the sky, and snow is frozen water
What is the numbers of molecules for 65.8g of CO2?
Answer:
8.98*10^23 molecules CO2
Explanation:
The molar mass of CO2 is 44.0 grams/mol. If we convert 65.8 grams of CO2 into moles, 65.8g CO2 / 44.0g CO2 then we get about 1.49 moles of CO2. We know there are 6.02*10^23 molecules in a mole, so we would just multiply 1.49 mol CO2 * 6.02*10^23 = 8.98*10^23
use the equation: 2Mg + O2→ 2MgO
Calculate the number of moles of oxygen needed to react with 6.00 moles of Mg.
Answer:
3 moles of O2 needed
Explanation:
2 moles of Mg to one mole O2
so 3 moles of O2 needed
alloy is combined by physically or chemically
Answer:
alloy is the homogeneous mixture of metal and metal or metal and non metal
Answer:
Yes, an alloy is combined physically or chemically into a separate compound. And a mixture of
Explanation:
Alloys have physical properties between those constituent metals and chemical properties remain unaffected. But alloys can be separated physically.
What mass, in grams, of sodium sulfate is needed to make 230.5 g of a 3.5 % (m/m) aqueous solution of sodium sulfate?
The percent concentration of a solution can be calculated from; mass of solute /mass of solution * 100. The mass of the solute here is 8.1 g.
What is concentration?The term concentration refers to the amount of solute presnt in a solution. There are many ways of expressing concentration such as molarity, molality and percentage.
Here;
mass of solution = 230.5 g
Percent of solute = 3.5 %
3.5 = x/ 230.5 * 100
3.5 = 100x/230.5
230.5(3.5) = 100x
x = 230.5(3.5) /100
x = 8.1 g
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Calculate the cell potential for the galvanic cell in which the given reaction occurs at 25 °C, given that [Cd2+]=0.00190 M and [Au3+]=0.788 M . Standard reduction potentials can be found in this table. 3Cd(s)+2Au3+(aq)↽−−⇀3Cd2+(aq)+2Au(s)
For a [Cd2+]=0.00190 M and [Au3+]=0.788 M conc, the cell potential is mathematically given as
Ecell=1.98V
What is the cell potential for the galvanic cell?Generally, the equation for the Chemical reaction is mathematically given as
Cd2+(aq) + 2e – → Cd(s)
Au3+(aq) + 3e– → Au(s)
Therefore
Ecell=Ecell-0,0582/nlog
Therefore
Ecell=Ered-Eoxy
Ecell=1.498-(-0.403)
Ecell=1.901
In conclusion
Ecell=1,901-0,0592/6log(0,0016/0.88)^2
Ecell=1.98V
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An alkyne with the molecular formula C6H10 was reduced with H2 and Lindlar's catalyst. Ozonolysis of the resulting alkene afforded formaldehyde and an unbranched aldehyde. What is the IUPAC name of the alkyne that was reduced?
Given that the alkyne has a formula as C₆H₁₀, the IUPAC name of the alkyne is hexyne
What is an alkyne?Alkynes are unsaturated hydcarbons with the general formula of CₙH₂ₙ₋₂. They contains triple bonds (C≡C) in the carbon chains. The simplest member of this family is ethyne (C₂H₂)
The first nine members of the Alkynes sre:
Ethyne, C₂H₂Propyne, C₃H₄ Butyne, C₄H₆ Pentyne, C₅H₈Hexyne, C₆H₁₀Heptyne, C₇H₁₂Octyne, C₈H₁₄Nonyne, C₉H₁₆Decyne, C₁₀H₁₈Considering the question given above, the formula of the alkyne is C₆H₁₀.
Therefore, the name of the alkyne is hexyne
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If you did not neutralize the saturated citric acid before you poured it down the drain, describe the potential consequences to the plumbing and the environment.
The plumbing will be corroded and could lower the pH of natural water bodies
What is acidic waste water?The term acidic waste water means water that has a low pH due to the presence of an acidic substance inside the waste water. As we know, citric acid has a low pH.
If this acid is disposed without proper neutralization, the plumbing will be corroded due to the fact that the acid will react with the plumbing material.
Also, this acidc waste could lower the pH of natural water bodies when it gets into natural water bodies.
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What is the difference between typhoons and hurricanes?
A. Wind speed
B. Strength of the wind
C. Amount of rainfall
D. Place of origin
What is the difference between typhoons and hurricanes?
A. Wind speed
B. Strength of the wind
C. Amount of rainfall
D. Place of origin
typhoons and hurricanes are both tropical cyclones its only one difference is the place of origin
option D place of origin
The solubility of magnesium fluoride, , in water is g/L. What is the solubility (in grams per liter) of magnesium fluoride in 0.29 M of sodium fluoride,
Answer:
1.457*10^-8 grams
Explanation:
First we want to find the molar concentration of MgF2. We can do this by dividing 0.016 (the solubility in grams of MgCl2 in a litre of water) by its molar mass (approx. 62.3 grams). Thus, the molar solubility of MgF2 is 2.57*10^-4 M.
Next, we must calculate the Ksp of MgF2. The equilibrium expression is:
MgF2⇄Mg+2F
Thus [tex]Ksp=[Mg^+][F^-]^2[/tex]
This means that, in equilibrium, there are 2.57*10^-4 M of [tex]M^+[/tex] and 5.136*10^-4 M of [tex]F^-[/tex]
Plugging in the above information, our Ksp for MgF2 is approximately 6.78*10^-11
Next we will need to use the RICE table. Since there is already 0.29M of NaF dissolved, there is initially 0.29M of [tex]F^-[/tex].
R: MgF2 ⇄ [tex]Mg^{+}[/tex]+2[tex]F^-[/tex]
I: N/A 0 0.29M
C: N/A +x +x
--------------------------------------------
E: N/A x 0.29+x
To make calculations easier, we will assume that 0.29+x≈0.29
This means that Ksp=0.29x=6.78*10^-11
Therefore, x≈2.338*10^-10M
Multiply that by 62.3 and we get around 1.457*10^-8 grams.
15.0 g of water at 0.0 °C are added to 40.0 g of water at 40.0 °C. What is the final
temperature of the mixture?
Answer:
40.0 c
Explanation:
Answer:
29.09 degree Celsius is final temperature
What is the pH when the [H+] is 1 x 10^-3 M
A. 2
B. 3
C. -3
D. 4
Answer:
3
Explanation:
PH = -Log [H+]
PH = -Log [1 × 10^-3]
PH = -Log [10^-3]
Log (10) = 1
PH = -(-3) Log (10)
PH = 3 × 1
PH = 3
Which statement best predicts and explains the product of a single displacement reaction when the cation (A) with an oxidation number of +2 and an anion (B) with the oxidation number of -3 react and form a compound?
A+2B-3 is the predicted formula when each metal cation has a charge of +2 and each non metal has a charge of -3.
B2A3 is the final formula for the metal anion bonding to the non-metal cation in a 2:3 ratio.
A3B2 is the predicted formula with an overall charge of the compound being zero and each atom has 8 valence electrons in their outermost electron shell.
A3B2 is the predicted formula is made when each metal cation gains three electrons from the anion while each nonmetal loses 2 electrons to each of the cations.
The statement that best predicts and explains the product of a single displacement reaction is ; ( C ) A3B2 is the predicted formula with an overall charge of the compound being zero and each atom has 8 valence electrons in their outermost electron shell.
Octet stateGiven that the oxidation number is +2 shows that it will be an octet when it donates its 2 electrons. also for octet B it will become complete when it accepts 3 electrons. Therefore in order to balance out the octet of each atom is by cross multiplying to get A3B2.
Hence we can conclude that The statement that best predicts and explains the product of a single displacement reaction is ; A3B2 is the predicted formula with an overall charge of the compound being zero and each atom has 8 valence electrons in their outermost electron shell.
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Write the formula for each of the following...I'm not telling you what kind of compound it
is, you need to figure it out!!
a. strontium bromide___________
b. tricarbon tetraphosphide_________
c. beryllium phosphate__________
d. calcium phosphide__________
e. manganese (II) thiosulfate_____
f. nitrogen monoxide
Which of the following potential ligands can form a maximum of two bonds to a metal
ion?
(a) C2042
(b) EDTA
(C) porphine
(d) CO32-
(e) both (a) and (d)
Based on the potential ligands given, C2O42- and CO32- can form a maximum of two bonds to a metal
ion.
What are ligands?Ligands are ion or molecule that binds to a central metal atom to form a coordination complex.
Ligands are essential in many biological and enzyme complexes.
From the potential ligands given;
C2O42- can form can form a maximum of two bonds to a metal ionCO32- can form two a maximum of two bonds to a metal ionEDTA can form five to six bonds to a metal ionPorphine can form one bond to a metal ionTherefore, the potential ligands, C2O42- and CO32- can form a maximum of two bonds to a metal
ion.
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If you have 1.50 moles of Bismuth (11) Sulfate in 0.750 m3, what would be the density of the material?
Which of the following is not true concerning aluminum?
Group of answer choices
Aluminum weighs twice as much as the same size piece of steel.
It takes about two metric tons of aluminum oxide to produce one metric ton of aluminum.
Aluminum corrodes more slowly than iron does.
It takes about 17,000 kilowatt hours of electricity to produce one metric ton of aluminum.
The statement that is true about aluminum is that it corrodes more slowly than iron does.
What is Aluminum?Aluminum is a slivery white metal that have atomic number of 13. It is most coon metal and make more than 8% of the Earth's core mass. It's also the third most common chemical element Earth. It is malleable and soft.
It is use for making kitchen utensils, cans and so on.
Aluminum cannot be decomposed by chemical methods.
Therefore, The statement that is true about aluminum is that it corrodes more slowly than iron does.
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Human colour vision is “produced” by the nervous system based on how three different cone receptors interact with photons of light in the eye. These three different types of cones interact with photons of different frequency light, as indicated in the following chart: Cone Type Range of Light Frequency Detected S 6.00-7.49 x 1014 s-1 M 4.76-6.62 x 1014 s-1 L 4.28-6.00 x 1014 s-1 What wavelength ranges (and corresponding colours) do the three types of cones detect?
The colors and the corresponding wavelengths the three types of cones detect are:
Blue: 450–495 nmGreen: 495–570 nmRed: 620–750 nmWhat is the role of cones in Human vision?Human vision refers to the ability of humans to see and visualize objects in the environment in terms in texture, color, pattern, etc.
The cells of the human eye responsible for vision are the rods and cones.
The cones are responsible for color-vision while rods are responsible for black and white vision.
The three types of cones detect blue, green, and red colors corresponding to wavelengths given below:
Blue: 450–495 nmGreen: 495–570 nmRed: 620–750 nmTherefore, the cones in the eye detect blue, green and red colors.
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A 76.89 g sample of a hydrocarbon(CxHy) has a mass of hydrogen that is equal to 10.45 g. Given this information, determine the empirical formula of this hydrocarbon. {MMC=12.01 and MMH=1.008}.
I’ll give the fastest person brainliest!!!!!! I need the answer asap!!!
Answer:
the empirical formula will be CH2
Explanation:
C
[tex] = \frac{66.44}{12} \\ = \frac{5.536}{5.536} \\ = 1 \\ = 1 \\ h \\ \frac{10.45}{1} \\ = \frac{10.450}{5.536} \\ = 1.88 \\ = 2[/tex]
sodium carbonate (+heat) →
Answer:
heat carbunate
Explanation:
thats true im good in here like and heart byebye
Select all the correct answers.
Which two generalizations can be made based on what you know about cycles of matter in a closed system?
o New matter is added, and old matter is destroyed.
O Matter changes its physical form, allowing it to return to its original state.
O The amount of matter within the system remains the same.
O Matter and energy can cross the boundaries of the system.
The cycle has a well-defined starting and stopping point.
PLSS HELP
Answer:
3) The amount of matter within the system remains the same
5) The cycle has a well-defined starting and stopping point.
Explanation:
A closed system is a system that the boundaries of a system cannot be passed by either matter or energy.
Hence, generalisations can be made based on a closed system and the law of conservation of mass which states that matter can neither be created nor destroyed but can only change form.
How can we know if an element is more active than the other one, so that it will displace it in displacement reaction.
Answer:
In a reactivity series, the most reactive element is placed at the top and the least reactive element at the bottom.
What is the scientific word used to describe the process of the protein in the eggs changing form?
Answer:
Denaturation
Explanation:
In which pair do both compounds exhibit predominantly ionic bonding?
A. RbCl and CaO
B. Kl and O3
C. Na2SO3 and BH3
D. NaF and H2O
E. PCl5 and HF
Answer:
In pair NaF and H2O both compounds exibit predominantly ionic bonding.
NaF and H[tex]_2[/tex]O exhibit predominantly ionic bonding. Therefore, the correct option is option D among all the given options.
What is ionic bond?Ionic bonding produces ionic, or electrovalent, combinations, which are best represented by compounds created between nonmetals and alkali as well as alkaline-earth metals.
The electrostatic attraction forces among opposing charges as well as repulsion between comparable charges position the ions in such a way that every positive charge is surround by negative ions as well as vice versa within ionic crystal structures of such a type.
In summary, the ions are organized in such a way that negative and positive charges alternate constantly balance one another, resulting in a total charge of zero for the entire material. NaF and H[tex]_2[/tex]O exhibit predominantly ionic bonding.
Therefore, the correct option is option D.
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3.1.4 Quiz: Covalent Bonds
Question 7 of 10
Choose the statements that are true about hydrogen.
A. Hydrogen has only one electron shell.
B. Hydrogen can bond with oxygen to make water,
C. When hydrogen has eight electrons in its valence shell, it has a
full valence shell.
D. If two hydrogen atoms bond to one oxygen atom, both atoms
have full valence shells.
Answer:
C. When hydrogen has two electrons in its valence shell, it has a full valence shell.
D. Hydrogen can bond with oxygen to make water.
As both C & D are correct, there would be two answers.
Hope this helps!
Explanation:
Answer:
The answer is A: Hydrogen has only one electron shell.
True or False: Based on the evidence in the graph, when 10 g of Ce2(SO4)3 is dissolved in 100 mL of water at 20°C, the solution is said to be unsaturated.
Based on the evidence in the solubility graph, when 10 g of Ce2(SO4)3 is dissolved in 100 mL of water at 20°C, the solution is said to be saturated.
What are unsaturated solutions?An unsaturated solution is a solution which contains less solute than it can actually dissolved in a given volume of solvent at a given temperature.
A solubility curve or graph provides information about the solubility of a solute at a given temperature.
From the solubility graph given, at 20°C, less than 10 g of Ce2(SO4)3 will be dissolved in 100 mL of water.
Therefore, when 10 g of Ce2(SO4)3 is dissolved in 100 mL of water at 20°C, the solution is said to be saturated.
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