Matter cannot be created or destroyed in a chemical reaction best describe law of conservation of mass.
What is law of conservation of mass?The law of conservation of mass states that for any system closed Mass can neither be created not destroy. the mass of the system must remain constant over time,.
Therefore, Matter cannot be created or destroyed in a chemical reaction best describe law of conservation of mass.
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What volume of a 0. 120 m cai2 solution would contain 0. 078 mol of the solute?.
Answer:650 mL
Explanation:
Remember that Molarity = mol/L. Rearranging the equation to solve for liters you get L = mol/Molarity.
80x10-3 mol / 12x10-2 M = 6.5x10-1 L
6.5x10-1 L (1x103) = 6.5x10 2 mL = 650mL
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What are 3 ways that radio waves are used in everyday life?
What are 3 ways that infrared waves are used in everyday life?
Thank You!
Explanation:
which of the following is additive inverse of the following
Which correctly describes the which correctly describes the relationship between a hydrate, water, and an anhydrous compound?
Heating an anhydrous compound forms water and a hydrate.
O Adding water to an anhydrous compound forms a hydrate.
O Combining an anhydrous compound and a hydrate produces water.
O Removing a hydrate from an anhydrous compound produces water.
Answer:
adding water to an anhydrous compound forms a hydrate.
Explanation:
The statement which correctly describes the relationship between a hydrate, water, and an anhydrous compound is adding water to an anhydrous compound forms a hydrate. The correct option is A.
What are anhydrous compounds?Anhydrous means without water, so the compounds that do not contain water are anhydrous compounds. Some examples are sodium sulfate, hydrogen fluoride, etc.
Hydrates are the compounds that contain water as the H2O molecules. These compounds lose their structure if water molecules are removed from the compound.
So, when water is added to the anhydrous molecules, it converts into hydrates. An example is sodium sulfate decahydrate.
Thus, the correct option is A. Adding water to an anhydrous compound forms a hydrate.
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60 points please help me i will appreciate it!
Answer:
[tex]\huge\boxed{\sf T = 682.4 \ K}[/tex]
Explanation:
Given Data:
Mole = n = 0.1 mol
Pressure = P = 530 mmHg = 0.7 atm
Volume = v = 8 L
Ideal gas constant = R = 0.8206 L atm K⁻¹ mol⁻¹
Required:
Temperature = T = ?
Formula:
Pv = nRT
Solution:
Rearranging for T
[tex]\displaystyle T = \frac{Pv}{nR} \\\\T = \frac{(0.7)(8)}{(0.1)(0.08206)} \\\\T = \frac{5.6}{0.008206} \\\\T = 682.4 \ K\\\\\rule[225]{225}{2}[/tex]
Which of the following is pure compound?
Ethanol,petrol,steel ,tapwater
Answer:
tap water Is the pure substance
Answer:
Ethanol is pure
Explanation:
Purity meaning homogenious molecules/atoms, steel is a mix of iron and carbon, tapwater has minerals in it + fluoride etc, petrol has oxane and ethanol in it. ethanol is only ethanol and is inherently pure
Which compound has the empirical formula with the greatest mass?
A.
C2H6
B.
C4H10
C.
C5H10
D.
C6H6
B. C4H10
Butane is a straight chain alkane composed of 4 carbon atoms. It has a role as a food propellant and a refrigerant. It is a gas molecular entity and an alkane.
Mass of C2H6 = 30.07 g/mol
Mass of C4H10 = 58.1222 g/mol
Mass of C5H10 = 70.1329 g/mol
Mass of C6H6 = 78.11184 g/mol
The mass of the empirical formula C6H6 is the greatest of all other compounds.
What is Molar mass?A chemical compound's molar mass is calculated by dividing its mass by the number of moles—measured in moles—that make up the sample of that compound. A substance's overall characteristics include its molar mass. The compound is present in many different forms, each with a different mass as a result of the isotopes. The molar mass is the average of these masses. The molar mass is most frequently calculated using the standard atomic weights and is a function of the relative abundance of the constituent atoms' isotopes on Earth. It is thus a terrestrial average. For converting between a substance's mass and its amount for large quantities, use the molar mass.To learn more about Molar mass, refer to:
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Determine the ka of the weak acid ha whose conjugate base has kb 2. 9 × 10−8
Answer: [tex]3.45*10^{-7}[/tex]
Explanation:
we can use the equation Ka * Kb = Kw
Kw is the equilibrium constant and always equals to [tex]1*10^{-14}[/tex]
we plug the given numbers into the equation, [tex]Ka * (2.9*10^{-8} )=(1*10^{-14} )[/tex]
now we just solve for Ka, [tex]Ka=\frac{1*10^{-14} }{2.9*10^{-8} }[/tex]
which gives us the value, [tex]Ka=3.45*10^{-7}[/tex]
hope this helped! ♡
The ka of the weak acid ha, whose conjugate base has kb 2. 9 × 10⁻⁸ is 3.45 × 10⁻⁷.
What is ka value?Ka value is the equilibrium constant found by the dissociation of acid.
By the equation
[tex]\rm ka \times kb = kw[/tex]
where kb = [tex]2.9 \times 10^-^8[/tex]
kw = [tex]1 \times 10^-^4[/tex]
Now, putting the values in the equation
[tex]1 \times 10^-^1^4 = ka \times 2.9 \times 10^-^8\\\\ka = \dfrac{1 \times 10^-^1^4}{2.9 \times 10^-^8} \\\\ka = 3.45 \times 10^-^7[/tex]
Thus, the ka of the weak acid ha, whose conjugate base has kb 2. 9 × 10⁻⁸ is 3.45 × 10⁻⁷.
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POSSIBLE POINTS:
I perform a Haber Process reaction and I get 10.0g of NH3, if I was theoretically supposed to get 15.7g, what is my percent yield?
O 63.69 %
O 60 %
O 63.7%
O 64 %
1
2
3
4
5
6
7
8
9
10
Answer:
63.7
Explanation:
Percent yield is actual yield over theoretical yield. In this case, 10/15.7 = .637 = 63.7%.
What are the factors that affect freezing-point depression
Hello people ~
Ignition temperature is the lowest temperature at which a substance catches fire. Identify the correct option regarding the ignition temperature of a good fuel.
A. Ignition temperature below room temperature
B. Ignition temperature above room temperature
C. Ignition temperature equal to 100∘C
D. Ignition temperature equal to room temperature
B is your answer
If the ignition temperature of a fuel is lower than the room temperature, then it can catch fire very easily.
Therefore for an ideal fuel, the ignition temperature should be higher than the room temperature.
let's observe one by one
#1
If ignition temperature is below room temperature the fuel can catch fire at once.
No#2
Ignition temperature above room temperature is applicable as the fuel won't catch fire easily
True#3
It's boiling point of water not fuels
False#4
Equal to room temperature is same as first one can cause damage
NoWhat does that mean about the densities of the phases of water?.
Answer:
The solid state is the most dense, followed by the liquid state, then the gas state. The solid state is more dense than the liquid state.
Explanation:
Does this answer your question???
In healthcare settings where sterilization is an absolute necessity, what method of sterilization will typically be used?
pasteurizing
disinfecting
autoclaving
boiling
lyophilizing
Answer:
Disinfecting (or boiling)
Explanation:
They'd want to disinfect everything so that it is germless. Boiling is a possible answer as well because you can boil certain things to rid them of germs.
3. How many moles of solute are present in a 2300 mL solution of 0.68 M MgSO.?
There are 1.56 moles of solute present in a 2300 mL solution of 0.68M MgSO4.
How to calculate number of moles?The number of moles of a substance can be calculated by using the following formula:
molarity = no. of moles / volume
According to this question, a volume of 2300 mL solution is contained in 0.68 M MgSO4. The number of moles is calculated as follows:
no of moles = 0.68M × 2.3
no. of moles = 1.56
Therefore, there are 1.56 moles of solute present in a 2300 mL solution of 0.68M MgSO4.
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The picture above shows a frying pan. Why are frying pans usually made out of metal?
Answer: The frying pan is made up of metals like aluminium or stainless steel as these metals are good conductor of heat.
Answer:
b. they are good conductors of heat
Explanation:
study island
What is required for a steady state reaction that is not required for an equilibrium reaction?.
Answer:
any thing going on within the organism its self- and is not unatural
Explanation:
If 1. 3618 moles of AsF3 are allowed to react with 1. 0000 mole of C2Cl6, what would be the theoretical yield of AsCl3, in moles
Answer:
AsF3:C2CI6
4:3
1.3618 moles: 1.02135 moles(1.3618÷4×3)
C2CI6 is the limting reagent
So the number of moles for AsCI3 is 0.817 moles( number of moles of the limting reagant) ÷3 ×4 (according to ratio by balancing chemical equation)=1.09 moles(3 s.f.)
or
Balanced equation
4AsF3 + 3C2Cl6 → 4AsCl3 + 3C2Cl2F4
Use stoichiometry to calculate the moles of AsCl3 that can be produced by each reactant.
Multiply the moles of each reactant by the mole ratio between it and AsCl3 in the balanced equation, so that the moles of the reactant cancel, leaving moles of AsCl3.
Explanation:
A monosaccharide is formed from a polysaccharide in what kind of reaction?.
Answer:
Catabolic reactions
Explanation:
Anabolic reactions combine monosaccharides to form polysaccharides, fatty acids to form triglycerides, amino acids to form proteins, and nucleotides to form nucleic acids. These processes require energy in the form of ATP molecules generated by catabolic reactions.
Which is more active? a. Iron or copper? ___________________
Answer:
iron
Explanation:
has more magnetic metal
Between iron and copper metals, iron is more active than copper metal as it is present above Co in the electrochemical series.
What is electrochemical series?Electrochemical series is a type of reactivity series in which metals are arranged from bottom to the top in the increasing order of their reactivity.
As we know that reactivity is directly proportional to the activity of any element. In the electrochemical series iron is situated at the top position as compared to the copper metal.
So, iron is more active.
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Calculate the volume that 2.25 mol of o2(g) will occupy at stp.
Explanation:
[tex]2.25mol \times \frac{22.4lit}{1mol} = 50.4 lit o2 [/tex]
Which ecosystem is more likely to become unstable one with many kinds of plants and animals or one with few kinds?
Answer:
One with a few kinds is more likely to become unstable.
Explanation:
A lack of biodiversity means there is a lower chance of them having traits that enable them to adapt to a changing environment. A lack of biodiversity is usually caused by humans. It could be the result of habitat loss, invasive species, overexploitation, pollution, or climate change.
What is the percent by mass of a solution containing 4. 0g of solute in 100g of water? (Percent by mass formula: (mass of solute/mass of solution) x 100) A 40 % B. 3. 8 % 26 % D. 2. 1 %
Draw the structures of the aldol addition and condensation products of 3‑methylbutanal
Aldol condensation involves two aldehydes or two ketones or an aldehyde and a ketone. The product of the reaction is shown in the image attached.
What is Aldol condensation?Aldol condensation is a reaction that involves two aldehydes or two ketones or an aldehyde and a ketone. This reaction occurs at the carbonyl group as one of the carbonyl compounds is in the enolate form.
The product of the reaction is shown in the image attached. This gives the mechanism for the Aldol condensation of the compound 3‑methylbutanal.
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What mass of glucose can be produced from photosynthesis reaction using 10.0 mols co2
Answer:
300.06 grams of glucose can be produced from a photosynthesis reaction that occurs using 10 moles of carbon dioxide.
Explanation:
can someone pls help me
Answer:
the picture is blurd
Explanation:
Oxidation reactions involve the loss of __________.
Answer:
Electrons
Explanation:
The chemical equation below shows the formation of aluminum oxide (al2o3) from aluminum (al) and oxygen (o2). 4al 3o2 right arrow. 2al2o3 the molar mass of o2 is 32.0 g/mol. what mass, in grams, of o2 must react to form 3.80 mol of al2o3? 60.8 grams 81.1 grams 122 grams 182 grams
The mass of oxygen must react to form 3.80 mol of Al₂O₃ in the given reaction is 182 grams.
How do we calculate mass from moles?Mass of any substance will be calculated by using their moles as:
n = W/M, where
W = required mass
M = molar mass
Given chemical reaction is:
4Al + 3O₂ → 2Al₂O₃
From the stoichiometry of the reaction it is clear that,
2 moles of Al₂O₃ = obtained from 3 moles of O₂
3.80 moles of Al₂O₃ = obtained from 3/2×3.80=5.7 moles of O₂
Now we calculate the mass of oxygen of 5.7 moles as:
W = (5.7mol)(32g/mol) = 182.4 grams or 182g
Hence option (4) is correct.
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Answer: 182 grams
Explanation:
A nitrogen bubble with a volume of 0.0050 mL forms in the joint of a scuba diver as she ascends rapidly from a pressure of 4.1 atm to the surface, with a pressure of 1.0 atm. What is the volume of the bubble at the surface
As the scuba diver ascends rapidly to the surface at the given pressure, the volume of the nitrogen bubble at the surface becomes 0.021mL.
Boyle's lawBoyle's law states that the volume V of a given quantity of gas is inversely proportional to its pressure P as long as temperature remains constant.
Boyle's law is expressed as;
P₁V₁ = P₂V₂
Where P₁ is Initial Pressure, V₁ is Initial volume, P₂ is Final Pressure and V₂ is Final volume.
Given the data in the question;
Initial volume; V₁ = 0.005mL = 5.0 × 10⁻⁶LInitial pressure; P₁ = 4.1atmFinal pressure; P₂ = 1.0atm Final volume; V₂ = ?We substitute our given values into the expression above to find the final volume.
P₁V₁ = P₂V₂
[tex]V_2 = \frac{P_1V_1}{P_2} \\\\V_2 = \frac{4.1atm \ *\ 5.0*10^{-6}L}{1.0atm}\\ \\V_2 = \frac{4.1 \ *\ 5.0*10^{-6}L}{1.0}\\\\V_2 = 2.05*10^{-6}L\\\\V_2 = 0.021mL[/tex]
Therefore, as the scuba diver ascends rapidly to the surface at the given pressure, the volume of the nitrogen bubble at the surface becomes 0.021mL.
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How many milliliters of 0. 120 m naoh are required to titrate 50. 0 ml of 0. 0998 m butanoic acid to the equivalence point? the ka of butanoic acid is 1. 5 × 10-5.
The volume of NaOH required to titrate 50 mL of 0.0998 M butanoic acid to the equivalence point is 41.58 mL
Balanced equationC₄H₈O₂ + NaOH —> C₄H₇O₂Na + H₂O
From the balanced equation above,
The mole ratio of the acid, C₄H₈O₂ (nA) = 1The mole ratio of the base, NaOH (nB) = 1From the question given above, the following data were obtained:
Concentration of base, NaOH (Cb) = 0.12 MConcentration of acid, C₄H₈O₂ (Ca) = 0.0998 MVolume of acid, C₄H₈O₂ (Va) = 50 mL Volume of base, NaOH (Vb) =?CaVa / CbVb = nA / nB
(0.0998 × 50) / (0.12 × Vb) = 1
4.99 / (0.12 × Vb) = 1
Cross multiply
0.12 × Vb = 4.99
Divide both side by 0.12
Vb = 4.99 / 0.12
Vb = 41.58 mL
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60 points please help me i will appreciate it!
Answer:
[tex]\huge\boxed{\sf v = 62.7 \ L}[/tex]
Explanation:
Given Data:
Mole = n = 3.38 mol
Temp = t = 269 K
Pressure = 1.19 atm
Gas constant = R = 0.08206 L atm K⁻¹ mol⁻¹
Required:
Volume = v = ?
Formula:
Pv = nRT
Solution:
Rearranging formula
[tex]\displaystyle v = \frac{nRT}{P} \\\\v = \frac{(3.38)(0.08206)(269)}{1.19} \\\\v = \frac{74.6}{1.19} \\\\v = 62.7 \ L\\\\\rule[225]{225}{2}[/tex]
What two countries have nearly 50% of global coal reserves? a. united states and canada b. united states and russia c. brazil and russia d. brazil and canada please select the best answer from the choices provided a b c d
Answer:
B
Explanation:
The two countries that have nearly 50% of global coal reserves are
United States and Russia
Option B is correct
What is the global coal reserves?
Estimates of total world proved recoverable coal reserves as were around 1,156 billion short tons, with five countries accounting for roughly 75% of the world's proven coal reserves.
In conclusion, The USA coal reserves amounted to nearly 248.9 billion metric tons in 2020
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