Answer:
symbiotic
Explanation:
There like a close friendship
When a chemical reaction is run in aqueous solution inside a calorimeter, the temperature change of the water (and Ccal) can be used to calculate the enthalpy change for the reaction. Here, we will study the reaction of hydrochloric acid with sodium hydroxide in the calorimeter from problem 3. Equal volumes (50.0 mL) of 1.00 M sodium hydroxide and 1.00 M hydrochloric acid are mixed.
HCl+NaOH→NaCl+H2O
1. What is the total change in enthalpy (in Joules) for the reaction?
2. Where initial temperature is 21.2 °C and final temperature is 28.0 °C. Ccal is 1234.28 j
Answer:
The total change in enthalpy for the reaction is - 81533.6 J/mol
Explanation:
Given the data in the question;
Reaction;
HCl + NaOH → NaCl + H₂O
Where initial temperature is 21.2 °C and final temperature is 28.0 °C. Ccal is 1234.28 J
Moles of NaOH = 50.mL × 1.00 M = 50.0 mmol = 0.0500 mol
Moles of HCl = 50.mL × 1.00 M = 50.0 mmol = 0.0500 mol
so, 0.0500 moles of H₂O produced
Volume of solution = 50.mL + 50.mL = 100.0 mL
Mass of solution m = volume × density = 100.0mL × 1.0 g/mL = 100 g
now ,
Heat energy of Solution q= (mass × specific heat capacity × temp Δ) + Cal
we know that; The specific heat of water(H₂O) is 4.18 J/g°C.
so we substitute
q_soln = (100g × 4.18 × ( 28.0 °C - 21.2 °C) ) + 1234.28
q_soln = 2842.4 + 1234.28
q_soln = 4076.68 J
Enthalpy change for the neutralization is ΔH[tex]_{neutralization}[/tex]
ΔH[tex]_{neutralization}[/tex] = -q_soln / mole of water produced
so we substitute
ΔH[tex]_{neutralization}[/tex] = -( 4076.68 J ) / 0.0500 mol
ΔH[tex]_{neutralization}[/tex] = - 81533.6 J/mol
Therefore, the total change in enthalpy for the reaction is - 81533.6 J/mol
Determine the number of atoms in 4.60 g gold.
Answer:
N(Au) = 1,20 × 10²²
Explanation:
1) n(Au) = m ÷ M = 4.60 g ÷ 197 g/mol = 0,02 mol
2) N(Au) = n(Au) × N(a) = 0,02 × 6.02*10²³ = 1,20 × 10²²
5. Why is picric acid and tannic acid used in the treatment of burns?
Can youguys helpplease its for marks and is due tommorow.
Explanation:
i believe this is right. my bad if its not
the first step in mitosis is the separateion of each pair of chromosomes true or false?
Answer:
true
Explanation:
Prophase is the first stage in mitosis, occurring after the conclusion of the G2 portion of interphase. During prophase, the parent cell chromosomes which were duplicated during S phase condense and become thousands of times more compact than they were during interphase.
A car travels 75 mi/hr. How many hours will it take to travel 837 km? (Pick the answer closest to the correct answer,
1.61 km=1 mile)
Answer:
6.9 hours
Explanation:
In order to solve this problem we'll convert 837 km to miles (another option would be to convert 75 mi/hr to km/hr). To make said conversion we'll use the given conversion factor:
837 km * [tex]\frac{1mi}{1.61km}[/tex] = 519.88 miFinally we calculate the time required to travel said distance at a constant speed of 75 mi/hr:
519.88 mi ÷ 75 mi/hr = 6.9 hrThe amount of time it would take to travel 837 km is equal to 7 hours.
Given the following data:
Speed = 75 mi/hr.Distance = 837 km.To determine the amount of time it would take to travel 837 km:
How to calculate time.First of all, we would convert the value of the distance in kilometers to miles as follows:
Conversion:
1.61 km = 1 mile
837 km = X mile.
Cross-multiplying, we have:
[tex]X=\frac{837}{1.61}[/tex]
X = 519.88 miles.
Mathematically, time is given by this formula:
[tex]Time = \frac{distance}{speed}[/tex]
Substituting the given parameters into the formula, we have;
[tex]Time = \frac{519.88}{75}[/tex]
Time = 6.93 ≈ 7 hours.
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What is the independent and dependent variable?
a. It is likely that you have observed a sealed soda can left out in a hot car expands. Based on the notion that gas escapes a liquid at high temperatures, a student chose to investigate the amount of dissolve oxygen in a local pond over a 12-month period.
b. Sulfur dioxide is a commonly used preservative in wine as it prevents oxidation and bacterial growth. A wine producer would like to explore if pH affects the solubility of SO2 in the wine, and therefore decides to measure the SO2 in the wine solution over a range of pH values.
c. The H2SO4 electrolyte concentration impacts the performance of lead-acid batteries, commonly used as car batteries. A researcher wishes to determine the optimal H2SO4 concentration for the best performance of the battery, as measured by the voltage output.
Answer:
The independent and dependent variable for the following are as follows:
a. Temperature and amount of dissolved oxygen
b. pH and SO2 solubility/amount
c. H2SO4 concentration and voltage output/performance of battery
Explanation:
In an experiment;
- Independent variable is the variable that the experimenter manipulates or changes in order to get a measurable response.
- Dependent variable is the variable that the experimenter measures based on its response to changes made to the independent variable.
A). In this experiment, a student is trying to investigate the amount of dissolved oxygen in a local pond in response to changes in temperature. Hence, the independent variable is the TEMPERATURE while the dependent variable is the AMOUNT OF DISSOLVED OXYGEN.
B). In this experiment, a wine producer would like to explore if pH affects the solubility of SO2 in the wine by measuring the amount of SO2 in the wine solution over a range of pH values. Hence, the independent variable is the pH while the dependent variable is the SO2 SOLUBILITY OR AMOUNT.
C). In this experiment, a researcher wishes to determine the optimal H2SO4 concentration for the best performance of the battery, as measured by the voltage output. Hence, the independent variable is the CONCENTRATION OF H2SO4 while the dependent variable is the VOLTAGE OUTPUT or PERFORMANCE of the battery.
Which of the following devices function on redox reaction ... Drycell, car battery and electric generator
Answer:
Drycell and car battery
Explanation:
Is it only one answer because I think both of these are redox reactions.
From previous experiments, this chemical reaction is known to absorb of energy. The position of the piston is monitored, and it is determined from this data that the system does of work on the piston during the reaction. Is the reaction exothermic or endothermic? exothermic endothermic Does the temperature of the water bath go up or down? up
Hello. Your question is missing data, which makes it difficult to answer it with exactness, but I will try to help you in the best possible way.
If the reaction absorbs energy it means that the reaction is endothermic. This is because endortemic reactions are those that absorb energy from the environment, as opposed to exothermic reactions that release energy into the environment.
In that case, if the reaction is absorbing energy, it is appropriate for the water bath temperature to drop.
Suggest a reason why it is desirable to use an excess of barium ion in the precipitation.
Answer:
Hello your question is poorly written hence i will give you a more general answer
answer : The reason why it is desirable to use an excess of barium ion in the precipitation is to form the compound needed,
Explanation:
Natural Precipitation occurs when condensed atmospheric water vapor falls due to the gravitational pull exerted on it by the clouds. precipitation can be in various forms like ; rain , ice pellets and snow . e.t.c
Hence the reason why it is desirable to use an excess of barium ion in the precipitation is to form the compound needed,
Also in order to form the precipitation, we will also add excess of barium ion which will help form the required precipitate and also filter out the mass of Sulphate.
In two or more complete sentences describe all of the van der Waals forces that exist between molecules of hydrogen sulfide, H2S.
Question 6: Describe an experiment for determining the position in the reactivity series for
copper, iron and magnesium. Include safety measures and the equipment you would use (5
Marks) *
(5 Points)
Enter your answer
BI
(hp)
Answer: BI
because of rection progress
Explanation:
Ammonia , NH3, equation stocihiometric balance
What is the molarity of a solution that contains 78.5 g of copper(II) chloride in 1.50 L of solution?
Answer:
0.389 M
Explanation:
From the question given above, the following data were obtained:
Mass of CuCl₂ = 78.5 g
Volume of solution = 1.50 L
Molarity of CuCl₂ =?
Next, we shall determine number of mole in 78.5 g of CuCl₂. This can be obtained as follow:
Molar mass of CuCl₂ = 63.5 + (35.5×2)
= 63.5 + 71
= 134.5 g/mol
Mass of CuCl₂ = 78.5 g
Number of mole of CuCl₂ =?
Mole = mass / Molar mass
Number of mole of CuCl₂ = 78.5 / 134.5
Number of mole of CuCl₂ = 0.584 mole
Finally, we shall determine the molarity of the solution. This can be obtained as follow:
Number of mole of CuCl₂ = 0.584 mole
Volume of solution = 1.50 L
Molarity of CuCl₂ =?
Molarity = mole / Volume
Molarity of CuCl₂ = 0.584 / 1.50
Molarity of CuCl₂ = 0.389 M
The molarity of a solution that contains 78.5 g of copper(II) chloride in 1.50 L of solution is 0.389M.
HOW TO CALCULATE MOLARITY?The molarity of a solution can be calculated
From the question given above, the following data were obtained:
Mass of CuCl₂ = 78.5 gVolume of solution = 1.50 LMolarity of CuCl₂ =?Next, we shall determine number of moles in 78.5g of CuCl₂. This can be obtained as follow:
Molar mass of CuCl₂ = 63.5 + (35.5×2)
= 63.5 + 71
= 134.5 g/mol
Mass of CuCl₂ = 78.5g
Number of mole of CuCl₂ = 78.5 / 134.5
Number of mole of CuCl₂ = 0.584 moles
The determine the molarity of the solution. This can be obtained as follow:
Number of moles of CuCl₂ = 0.584 molesVolume of solution = 1.50LMolarity of CuCl₂ =?Molarity = mole / Volume
Molarity of CuCl₂ = 0.584 / 1.50
Molarity of CuCl₂ = 0.389M
Therefore, molarity of a solution that contains 78.5 g of copper(II) chloride in 1.50 L of solution is 0.389M.
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The point where ground water reaches the surface and pours out is called a summer? true or false
Answer:
False
Explanation:
Groundwater and surface water have a relationship.
Groundwater is the water that is contained in a subsurface layer of an underlying soil/rock whereas surface water is that found in a lake, river or some other surface cavities.
However, when groundwater is discharged to surface water bodies, it is said to be surface water. Thus the statement asked is false.
When riding a roller coaster, you go up and down many hills. As you get to the top of a roller coaster, what energy change is taking place?
A. potential energy is changed into kinetic energy
B. kinetic energy is changed into potential energy
C. chemical energy is changed into heat energy
D. heat energy is changed into chemical energy
Answer:
A.
Explanation:
The potential energy of the roller coaster increases as the coaster goes up a hill and can be converted to kinetic energy.
Which one of these situations would have higher density water? Water with a lower salt content Water at the equator Water near where a river enters the ocean Lower temperature water
A higher density water will be obtained in lower temperature water.
What is density?Density is the fluid property that describes the amount of solutes that dissolves in a given volume of the fluid.
Density of a fluid is calculated by taking the ratio of mass to volume of the fluid.
[tex]\rho = \frac{m}{v}[/tex]
When the temperature of the water is low, more mass of the water is obtained while a high temperature evaporates the liquid.
Thus, a higher density water will be obtained in lower temperature water.
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What is the molar mass of Ammonium Carbonate?
Answer:
96.09 g/mol
Explanation:
LID
Question 3
20 pts
How many atoms of aluminum can be produced by the decomposition of 31.5 g of
Al2O3?
(Hint: Write and balance the equation first.)
09.30 x 10 22 Al atoms
1.86 x 1023 Al atoms
O 7.44 x 1023 Al atoms
O none of these
O 3.72 x 1023 Al atoms
I need help
Answer:
See Down
Explanation:
2Al2O3 = 4Al + 3O2 (Decomposition)
31.5/101.961g = 0.3089mol
(0.3089mol/2) * 4 = 0.61788 mole of Al
0.61788 mole * 6.022x10^23 atoms/mol = Your answer
What is the electrostatic potential energy (Eel) of the ionic bond between a Ca2+ ion and a S2– ion in joules? Before you do the calculation, predict whether the result you get will be less than (more negative) or greater than (less negative) than the Eel value for KCl. The ionic radii of Ca2+ and of S2– are 100 pm and 184 pm, respectively.
Answer: the electrostatic potential energy is -3.26 × 10⁻¹⁸ J
Explanation:
Given the data in the question;
I think the value of electrostatic potential energy of calcium sulfide CaS formed will be less(more negative) than KCl because the Ca2+ and S2- ions has more charge that is +2 and -2 respectively when compared to Kcl which has +1 and -1 charge.so it will be more negative.
radius = r[tex]_{ca+2}[/tex] + r[tex]_{s-2}[/tex] = 100 + 184 = 284 pm = 2.84 × 10⁻¹⁰ m
we know that; k = 2.31 × 10⁻²⁸ J
q1 = 2 ( charge on Ca⁺² )
q2 = -2( charge on S⁻²)
so
Ep = k × q1q2/r
so we substitute
Ep = 2.31 × 10⁻²⁸ × (+2×-2) / 2.84 × 10⁻¹⁰
Ep = (2.31 × 10⁻²⁸ × -4) / 2.84 × 10⁻¹⁰
Ep = -9.24 × 10⁻²⁸ / 2.84 × 10⁻¹⁰
Ep = -3.26 × 10⁻¹⁸ J
Therefore, the electrostatic potential energy is -3.26 × 10⁻¹⁸ J
Based on the data provided, the electrostatic potential energy is -3.26 × 10⁻¹⁸ J
What is electrostatic potential energy?The electrostatic potential energy is the work done in moving the charge from infinity to that point against the electric field.
The electrostatic potential energy between any two charges q1, q2 separated by distance r is derived from Coulomb’s law and mathematically given as:
E = k × [q1q2/r2]where
k is a constant = 2.31 × 10⁻²⁸ Jq1 and q2 are the chargesr is the distance of separationFrom the data provided:
ionic radii of Ca2+ r1 = 100 pm
ionic radii of S2– = 184 pm.
Chargeon Ca2+ = +2
Charge on S2_ = -2
From the data above, it most likely that the value of electrostatic potential energy of calcium sulfide CaS formed will be less(more negative) than KCl because the Ca2+ and S2- ions has a greater charge of +2 and -2 respectively compared to Kcl which has +1 and -1 charge.
Calculating the electrostatic potential energy, Ep:
radius = r1 + r2 = 100 + 184 = 284 pm
r = 2.84 × 10⁻¹⁰ m
k = 2.31 × 10⁻²⁸ J
q1 = 2 ( charge on Ca⁺² )
q2 = -2( charge on S⁻²)
Then:
Ep = k × q1q2/r
Substituting the values above in the equation:
Ep = 2.31 × 10⁻²⁸ × (+2 ×-2) / 2.84 × 10⁻¹⁰
Ep = (2.31 × 10⁻²⁸ × -4) / 2.84 × 10⁻¹⁰
Ep = -9.24 × 10⁻²⁸ / 2.84 × 10⁻¹⁰
Ep = -3.26 × 10⁻¹⁸ J
Therefore, the electrostatic potential energy is -3.26 × 10⁻¹⁸ J.
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What is the freezing point (in degrees Celcius) of 4.14 kg of water if it contains 235.1 g of butanol, C 4 H 9 O H
Answer:
Explanation:
Molal freezing point depression constant of butanol Kf = 8.37⁰C /m
ΔTf = Kf x m , m is no of moles of solute per kg of solvent .
mol weight of butanol = 70 g
235.1 g of butanol = 235.1 / 70 = 3.3585 moles
3.3585 moles of butanol dissolved in 4.14 kg of water .
ΔTf = 8.37 x 3.3585 / 4.14
= 6.79⁰C
Depression in freezing point = 6.79
freezing point of solution = - 6.79⁰C .
Explain the 3 steps required to determine the molecular formula.
Answer:
The steps involved in determining a Molecular Formula are: Find the mass of the empirical formula. Divide the molecular mass by the mass of the empirical formula. Multiply each subscript in the empirical formula by the answer.
Explanation:
A 150.0mL sample of an aqueous solution at 25C contains 15.2mg of an unknown nonelectrolyte compound. If the solution has an osmotic pressure of 8.44 torr, what is the molar mass of the unknown compound?
Answer:
MM = 225.11 g/mol
Explanation:
In this case, let's analyze the data.
We have a 15.2 mg of an unknown electrolyte in 150 mL of solution. The osmotic pressure is 8.44 Torr, and we want the molecular mass of the unknown.
The osmotic pressure can be calculated using the following expression:
π = CRT (1)
π: osmotic pressure (8.44 Torr * 1 atm / 760 Torr = 0.011 atm)
C: Concentration of the unknown in the solution
R: universal constant of gases (0.082 L atm / K mol)
T: temperature in Kelvin (25 + 273 = 298 K)
From this expression, we can either solve for C, and then use another expression to calculate the molecular mass, or we can just replace the expressions in the above formula, to get the direct molecular mass. In this case, we'll follow the second method.
Concentration or molarity of a substance can be calculated using:
C = moles / V (2)
And moles can be calculated using this expression:
moles = m / MM (3)
Replacing (3) in (2), and then in (1) we have:
C = m / MM * V
π = m * RT / MM * V (4)
and now, we can solve for MM:
MM = mRT / π V (5)
Now, we just need to replace the given data into the above expression to get the value of the molecular mass:
MM = (15.2 / 1000) * 0.082 * 298 / 0.011 * 0.150
MM = 225.11 g/molHope this helps
Which type of solution below has a cloudy appearance? (Choose all that apply)
a. Colloids
b. Suspensions
c. Solutions
d. Alloys
The type of solutions which are appearing cloudy are called colloids. Therefore, option a is correct.
What are colloids ?Colloids are mixtures in which particles of one substance are evenly dispersed throughout another substance, creating a stable mixture. The particles in a colloid are larger than those found in a solution, but smaller than those found in a suspension.
Colloids can be found in various states of matter, including solid, liquid, and gas, and they can be formed from a wide range of substances, such as polymers, metals, and biological molecules.
One important characteristic of colloids is their ability to scatter light. This phenomenon, known as the Tyndall effect, occurs when light passes through a colloid and is reflected by the particles, causing the mixture to appear cloudy or hazy.
Colloids also exhibit unique properties related to their size and shape, such as viscosity, surface tension, and Brownian motion. They appear cloudy in nature.
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How many moles of potassium sulfate are present in a sample that weighs 45.8g?
I do not understand how to solve this please help
Answer:
0.263 mol
Explanation:
K2SO4 - potassium sulfate
Molar mass (K2SO4) = 2*39.0983 + 32.065 + 4*15.9994 =
= 174.2592≈174.26 g/mol
45.8 g * 1 mol/174.26 g = 0.263 mol
Elements are simple ___
made of the same type of ____. They cannot be ___
down chemically. There are about 118 known
elements and most elements are ___
They are ____ in
appearance and are good ___ of heat and _____. Compounds are made from ___
or more elements chemically _____.
Answer:
particles
atoms
broken
isotope
conductors
electricity
element
combined
How many mL of 14.5M lithium carbonate solution must be used to deliver 4.20 g of lithium ion
Answer:
10.3 g Li) / (6.9410 g Li/mol) x (1 mol Li3PO4 / 3 mol Li) / (0.750 mol/L Li3PO4) = 0.6595 L = 660. mL
Explanation:
Which product of photosynthesis is the food?
Oxygen
Carbon Dioxide
Water
Glucose
Answer:
Oxygen
Explanation:
In photosynthesis, solar energy is harvested and converted to chemical energy in the form of glucose using water and carbon dioxide. Oxygen is released as a byproduct.
Answer:
the answer is a) oxygen
Explanation:
when plants are performing photosynthesis they take in carbon dioxide given out by humans and animals which is the balance of nature and give out oxygen. in this process sunlight and chlorophyll is also involved!!!!
I hope I cleared your doubt :)
Describe what an Ionic Substance is....
Answer:
Ionic Substance is....
Explanation:
In chemistry, an ionic compound is a chemical compound composed of ions held together by electrostatic forces termed ionic bonding. The compound is neutral overall, but consists of positively charged ions called cations and negatively charged ions called anions.
A liquid is a substance ______