Answer:
Physical Change. Physical changes are changes in which no bonds are broken or formed. This means that the same types of compounds or elements that were there at the beginning of the change are there at the end of the change.
A student performed the experiment in this module but failed to follow the procedure exactly, keeping the crucible completely covered during the entire heating and cooling processes. Be specific.
1. Explain the probable effect of this procedural change on the experimental results.
2. Would the student's calculated percent water in the hydrate be high, low, or unaffected? Briefly explain
Answer:
This question is incomplete
Explanation:
This question is incomplete but the answer to the question can be correctly predicted from the available information from the question.
1. If a "container" (in this case a crucible) is closed throughout a heating experiment. Then it must be noted that water vapor will not be able to escape during the course of the experiment. The water vapor will form a "cloud" of water droplets under the cover of the crucible. And when this crucible is cooled, this water droplets return back to the content/substance inside the crucible.
2. When compared with the initial amount of water present in the substance in the crucible, the percentage of water "left" in the hydrate or substance in the crucible would be high. This is because the water vapor that was suppose to leave the crucible did not leave because the crucible was closed (thus causing very low amount of water vapour to leave).
Because of the student error, the percent water of crystallization value the hydrate will be lower than its actual value.
What is evaporation?Evaporation is the process by which a liquid changes spontaneously to vapor.
In the experiment to determine percentage water of crystallization, the crucible is left open to ensure all the water molecules are removed by evaporation.
However,, since the student did not remove the crucible cover during heating, some water molecules will not be able to escape completely, but will return back to the salt.
Hence, the percent water of crystallization value the hydrate will be lower because the of mass of the anhydrous salt will be higher than its actual value.
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I WILL GIVE YOU A BRAINLIEST: Bryce observes that the sun always seems to rise in the east. He talks with others and finds that everyone has the same observation. Which term describes this equation? A) the sun rises in the east B) Why does the sunrise in the east? C) The sun appears in the east because of Earth’s rotation pattern. D) If the sun appears in the east, then I am in the Western Hemisphere.
Answer: C
Explanation:
No matter the location on Earth, the sun always rises in the east due to its rotation pattern.
Classify which compounds will dissolve in water and which ones will not dissolve in water.
a. Accetone
b. I-propanol
c. Hexane
d. Methanol
e. Decane
Answer:
Dissolves in water: Acetone, 1-propanol, Methanol
Do not dissolve in water: Hexane, Decane
Explanation:
From the principle that like dissolves like,polar substances will dissolve in polar solutions, while non-polar substances will dissolve in non-polar substances.
Water is a polar solution, therefore, polar substances will dissolve in it.From the given options:
Acetone is a polar molecule, therefore, it will dissolve in water.
1-propanol is a polar molecule, therefore, it will dissolve in water.
Hexane is a non-polar molecule, therefore, it will not dissolve in water.
Methanol is a polar molecule, therefore, it will dissolve in water.
Decane is a non-polar molecule, therefore, it will not dissolve in water
A 11.1-g sample of granite initially at 76.0°C is immersed into 22.0 g of water initially at 22.0°C. What is the final temperature of both substances when they reach thermal equilibrium? (For water, Cs=4.18J/g⋅∘C and for granite, Cs=0.790J/g⋅∘C.)
Answer:
[tex]T_f=26.7\°C[/tex]
Explanation:
Hello.
In this case, when two substances at different temperature are placed in contact in an isolated container, we can say that the heat lost by the hot substance is gained by the cold substance. In such a way, since granite is at 76.0 °C and water at 22.0 °C we infer granite is hot and water is cold, so we write:
[tex]Q_{granite}=-Q_{water}[/tex]
In terms of mass, specific heat and change in temperature, we write:
[tex]m_{granite}C_{granite}(T_f-T_{granite})=-m_{water}C_{water}(T_f-T_{water})[/tex]
Thus, since the temperature is the same for both substance, we can solve for it as shown below:
[tex]T_f=\frac{m_{granite}C_{granite}T_{granite}+m_{water}C_{water}T_{water}}{m_{granite}C_{granite}+m_{water}C_{water}}[/tex]
By plugging in each variable, we obtain:
[tex]T_f=\frac{11.1g*0.790\frac{J}{g\°C} *76.0\°C+22.0g*4.18\frac{J}{g\°C} *22.0\°C}{11.1g*0.790\frac{J}{g\°C} +22.0g*4.18\frac{J}{g\°C}}\\\\T_f=26.7\°C[/tex]
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NEED ANSWERS NOW 100 PTS
Is iron iii fluoride ionic or covalent
Is carbon disulfide ionic or covalent
Answer:
iron i believe is ionic and carbon is covalent
Explanation:
if im wrong correct me
Production of 6.5 grams of C2H2 requires consumption of how many grams of H2O
Answer:
C
Explanation:
Grams 3/4
Answer:
9g
Explanation:
number of moles × the moleculars mass
Alcohol is a
Depressant
Muscle relaxer
Both
Alcohol is both a Depressant and a Muscle Relaxer. Therefore the answer would be both!
Hope this helps :)
Given that 10.00mL of 0.1894M CH3COOH was titrated with 0.2006M NaOH in this experiment, calculate the volume, in mL, of NaOH required
Answer:
[tex]V_{base}=9.442mL[/tex]
Explanation:
Hello!
In this case, when acetic acid is titrated with sodium hydroxide, the following chemical reaction is carried out:
[tex]CH_3COOH+NaOH\rightarrow CH_3COONa+H_2O[/tex]
Whereas there is a 1:1 mole ratio between the acid and the base, which means that at the equivalence point we evidence:
[tex]n_{acid}=n_{base}[/tex]
Which in terms of volumes and concentrations is written as:
[tex]M_{acid}V_{acid}=M_{base}V_{base}[/tex]
Thus, solving for the required volume of base, we obtain:
[tex]V_{base}=\frac{M_{acid}V_{acid}}{M_{base}}=\frac{0.1894M*10.00mL}{0.2006M}\\\\ V_{base}=9.442mL[/tex]
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How many moles is 3.01 x 10 24 molecules of oxygen ( g)?
Answer:
5.00 moles O₂
General Formulas and Concepts:
Chemistry - Atomic Structure
Using Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
3.01 × 10²⁴ molecules O₂
Step 2: Convert
[tex]3.01 \cdot 10^{24} \ mc \ O_2(\frac{1 \ mol \ O_2}{6.022 \cdot 10^{23} \ mc \ O_2} )[/tex] = 4.99834 moles O₂
Step 3: Check
We are given 3 sig figs. Follow sig fig rules and round.
4.99834 moles O₂ ≈ 5.00 moles O₂
an 11.5g sample of ethonal 6.00g of Carbon 1.51g of hydrogen what is the percent composition of each element
C : 52.2%, H : 13.1%, O:34.7%
Further explanationThe empirical formula is the smallest comparison of atoms of compound forming elements.
A molecular formula is a formula that shows the number of atomic elements that make up a compound.
(empirical formula) n = molecular formula
11.5 g of Ethanol-C₂H₅OH contains 6.00 g of Carbon and 1.51 g of Hydrogen.
mass of Oxygen :
[tex]\tt 11.5-(6+1.51)=4~g[/tex]
Percent composition :
C[tex]\tt \dfrac{6}{11.5}\times 100\%=52.2\%[/tex]
H[tex]\tt \dfrac{1.51}{11.5}\times 100\%=13.1\%[/tex]
O[tex]\tt \dfrac{4}{11.5}\times 100\5=34.7\%[/tex]
What is the formula for Mercury ii monohydrogen phosphate?
Answer:
CaHPO4 i think
Explanation:
What happens to a Lithium atom for it to become an Li+1 ion?
Answer:
If an atom gains or loses an electron, it bacomes an ion. An atom that gains a negative electron, it becomes a negative ion. If it loses an electron it becomes a positive ion
Explanation:
A lithium atom has 3 protons and 3 electrons. It can lose one of its electrons, making it an ion. It now has more positive protons than electrons so it has an overall positive charge. Therefore it is a positive ion.
A fluorine atom will tend to gain, rather than lose, an electron. By gaining a negative electron, it has an overall negative charge. It has become a negative ion.
How many molecules are in 650.0 g Mg(OH)₂ ?
Answer:
6.711 × 10²⁴ molecules Mg(OH)₂
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
650.0 g Mg(OH)₂
Step 2: Define conversions
Avogadro's Number
Molar Mass of Mg - 24.31 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of H - 1.01 g/mol
Molar Mass of Mg(OH)₂ - 24.31 + 2(16.00) + 2(1.01) = 58.33 g/mol
Step 3: Convert
[tex]650.0 \ g \ Mg(OH)_2(\frac{1 \ mol \ Mg(OH)_2}{58.33 \ g \ Mg(OH)_2} )(\frac{6.022 \cdot 10^{23} \ molecules \ Mg(OH)_2}{1 \ mol \ Mg(OH)_2} )[/tex]
= 6.71061 × 10²⁴ molecules Mg(OH)₂
Step 4: Check
We are given 4 sig figs. Follow sig fig rules.
6.71061 × 10²⁴ molecules Mg(OH)₂ ≈ 6.711 × 10²⁴ molecules Mg(OH)₂
Which of the following correctly identifies and explains the charge on an atom of
sodium?
Answer:
The best and most correct answer among the choices provided by your question is the fourth choice.
The data explains that sodium atoms hardly ever form 2+ ions.
I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!
Explanation:
Determine the molarity of 1.2 mol KCl in 1.1 L of a solution?
Answer:
1.1 M
General Formulas and Concepts:
Molarity = moles of solute / liters of solutionExplanation:
Step 1: Define variables
1.2 mol KCL
1.1 L of solution
M = unknown
Step 2: Solve for Molarity
Substitute: M = 1.2 mol/1.1 LEvaluate: M = 1.09091Step 3: Check
We are given 2 sig figs. Follow sig fig rules.
1.09091 M ≈ 1.1 M
find the volume of a gas at standard pressure if its volume at 1.9 atm is 80 ml?
given:
formula:
substitution:
answer:
Answer:
1.5 × 10² mL
Explanation:
Step 1: Given data
Initial pressure of the gas (P₁): 1.9 atmInitial volume of the gas (V₁): 80 mLFinal pressure of the gas (P₂): 1.0 atm (standard pressure)Final volume of the gas (V₂): ?Step 2: Calculate the final volume of the gas
For an ideal gas, we can calculate the final volume of the gas using Boyle's law.
P₁ × V₁ = P₂ × V₂
V₂ = P₁ × V₁/P₂
V₂ = 1.9 atm × 80 mL/1.0 atm
V₂ = 1.5 × 10² mL
Since the pressure decreased, the volume of the gas increased.
Which of the following is a renewable source of energy?
Answer: D
Explanation:
Hydropower
how does conc.H2SO4 reacts with sugar?
Which property of a sound wave increases as the pitch of the sound
increases?
A. Amplitude
B. Wavelength
C. Rest position
ОО
D. Frequency
Answer:
the answer is d. frequency
A solution has a concentration of 0.001 M NaOH (MM = 40.00
g/mol). Suppose you have 1000 g of this solution which
occupies a volume of 1 L. What is the percent by mass
concentration of NaOH?
Percent by mass : 4.10⁺³%
Further explanationThe concentration of a solution can be expressed in units such as molarity, normality, mass percent, volume percent etc.
[tex]\tt \%mass=\dfrac{mass~solute}{mass~solution}\times 100\%[/tex]
mass solute= mass of NaOH
mass of NaOH :
[tex]\tt 0.001~mol/L\times 1~L\times 40~g/mol=0.04~g[/tex]
mass solution = 1000 g
% mass :
[tex]\tt \dfrac{0.04}{1000}\times 100=4.10^{-3}\%[/tex]
The percent by mass concentration of NaOH in the given solution is approximately 0.004%.
To calculate the percent by mass concentration of NaOH, we must find the mass of NaOH in solution.
First, we determine how many moles of NaOH are present in the solution:
Molarity (M) is calculated as moles of solute per liter of solution.
1 L = 0.001 M = mole of NaOH
We rearrange the equation to find that one mole of NaOH is equal to 0.001 moles.
Mass of NaOH = moles of NaOH * molar mass of NaOH
Mass of NaOH = 0.001 mol * 40.00 g/mol
Mass of NaOH = 0.04 g
The mass of the solution is 1000 g which is given in the question.
Percent by mass concentration of NaOH = (mass of NaOH / mass of solution) * 100%
Percent by mass concentration of NaOH = (0.04 g / 1000 g) * 100%
Percent by mass concentration of NaOH = 0.004%
Hence, the percent by mass concentration of NaOH in the given solution is approximately 0.004%.
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How many molecules are there in .0023kg of NH4SO2?
Answer:
Molar mass of NH4SO2=104gmol`
No of moles of NH4SO2=2.3g/104gmol`=0.022×(avagadro's constant)
At a constant temperature, which of the gases will have the highest average
kinetic energy?
A) H2
B) N2
C) O2
D) F2
E) All the gases will have the same average
kinetic energy.
H₂ will have the highest average kinetic energy
Further explanationEnergy because this motion is expressed as Kinetic energy (KE) which can be formulated as:
[tex]\tt \displaystyle KE=\frac{1}{2}mv^2[/tex]
Average velocities of gases can be expressed as root-mean-square averages. (V rms)
[tex]\large{\boxed{\bold{v_{rms}=\sqrt{\frac{3RT}{Mm} } }}[/tex]
R = gas constant, T = temperature, Mm = molar mass of the gas particles
From the two equations above, it can be concluded
KE is directly proportional to gas velocity Gas velocity is inversely proportional to molar massSo the highest KE is owned by the gas with the smallest molar mass
Molar mass of the gas :
A) H₂ : 2 g/mol
B) N₂ : 28 g/mol
C) O₂ : 32 g/mol
D) F₂ : 38 g/mol
So H₂ has the highest average kinetic energy
At a constant temperature: E. All the gases will have the same average kinetic energy.
According to the kinetic-molecular theory, the average kinetic energy of gas molecules (particles) is highly dependent on temperature.
Hence, the average kinetic energy of gas molecules (particles) is directly proportional to the absolute temperature of the gas.
At a constant temperature, all gases would have the same average kinetic energy according to the kinetic-molecular theory of gases.
In conclusion, all the gases would have the same average kinetic energy since the temperature is constant.
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How many grams of C2H6 are needed to react with 54 grams of O2?
Answer:
Explanation:
in a combustion of ethane 2 moles of ethane react with 7 moles of O2
now no of moles in 54 gram of O2=mass/ molar mass
moles =54/32=1.7 moles
if 7 moles of O2 required 2 moles of ethane then 1.7 mole required=?
7 moles of O2=2 moles of C2H6
1.7 moles of O2=1.7*2/7=0.5 moles of C2H6
0.5 moles of C2H6 contain how much grams=?
mass= moles*molar mass=0.5*30=15
What temperature (in °C) did an ideal gas shift to if it was initially at -10.0 °C at 4.62 atm and 35.0 L and the pressure was changed to 8.71 atm and the volume changed to 15.0 L
Answer:
-251.9°C
Explanation:
Given data:
Initial volume = 35.0 L
Initial pressure = 4.62 atm
Initial temperature = -10.0 °C (-10.0 +273 = 263.0 K)
Final temperature = ?
Final volume = 15.0 L
Final pressure = 8.71 atm
Solution:
According to general gas equation:
P₁V₁/T₁ = P₂V₂/T₂
Now we will put the values,
4.62 atm × 35.0 L / 263.0 K = 8.71 atm × 15.0 L /T₂
T₂ = 8.71 atm × 15.0 L × 263.0 K / 4.62 atm × 35.0 L
T₂ = 34360.95 atm.L.K /161.7 atm.L
T₂ = 21.26 K
Kelvin to °C:
21.26 - 273.15 K = -251.9°C
A student measures the length of two pieces of paper as 8.21 in
and 8.0 in. What is the total length? Be sure to use sig. figs. in
your answer. Do not include the unit.
Answer: 16.21
Explanation:
A student measures the length of two pieces of paper as 8.21 in and 8.0 in. the total length is 16.21 with 4 significant figures.
What are significant figures?
The significant figures or digits are the form of scientific methd which represent the digit from zero to nine and use when the value is uncertain where starting zeros are not significant and decimal is also not a significant figure.
In the given value the total is 16.21 with 4 significant figures with it has 4 significant digits and the decimal with it is not significant after adding from which the respective value is here.
Therefore, with 4 significant figures where the student measures the length of two pieces of paper as 8.21 in and 8.0 in. the total length is 16.21.
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If a sample containing 18.1 g of NH3 is reacted with 90.4 g of
Cuo, which is the limiting reactant? How many grams of N2
will be formed?
Answer:
3.64g
Explanation:
Given parameters:
Mass of NH₃ = 18.1g
Mass of Cu₂O = 90.4g
Unknown:
Limiting reactant = ?
Mass of N₂ formed = ?
Solution:
The reaction equation is given as:
Cu₂O + 2NH₃ → 6Cu + N₂ + 3H₂O
The limiting reactant is the one in short supply in the reaction. Let us find the number of moles of the given species;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of Cu₂O = 2(63.6) + 16 = 143.2g/mol
Molar mass of NH₃ = 14 + 3(1) = 17g/mol
Number of moles of Cu₂O = [tex]\frac{18.1}{143.2}[/tex] = 0.13moles
Number of moles of NH₃ = [tex]\frac{90.4}{17}[/tex] = 5.32moles
From this reaction;
1 mole of Cu₂O combines with 2 mole of NH₃
So 0.13moles of Cu₂O will combine with 0.13 x 2 mole of NH₃
= 0.26moles of NH₃
Therefore, Cu₂O is the limiting reactant. Ammonia is in excess;
Mass of N₂;
Mass = number of moles x molar mass
1 mole of Cu₂O will produce 1 mole of N₂
0.13 mole of Cu₂O will produce 0.13 mole of N₂
Mass = 0.13 x (2 x 14) = 3.64g
A bicycle has a momentum of 25.00 kg x m/s and a velocity of 2.5 m/s. What is the bicycle’s mass
Answer:
10 kgExplanation:
The mass of the bicycle can be found by using the formula
[tex]m = \frac{p}{v} \\ [/tex]
p is the momentum
v is the velocity
From the question we have
[tex]m = \frac{25}{2.5} \\ [/tex]
We have the final answer as
10 kgHope this helps you
Is calcium oxide a Element or compound or mixture?
Answer:
compound
Explanation:
Answer:
The answer is compound
Explanation:
What amount of moles of sodium chloride is needed to prepare 1.25 L of a salt solution with a concentration of 0.750 mol/L
Answer:
Number of moles = 0.94 mol
Explanation:
Given data:
Number of moles of sodium chloride = ?
Volume of sodium chloride = 1.25 L
Concentration of solution = 0.750 mol/L
Solution:
Formula:
Concentration = number of moles/ volume in L
By putting values.
0.750 mol/L = number of mole / 1.25 L
Number of moles = 0.750 mol/L×1.25 L
Number of moles = 0.94 mol
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