Answer:
Is there a question?
Explanation:
n a coffee cup calorimeter, 100.0 mL of 1.0M NaOH and 100.0 mL of 1.0M HCl are mixed. Both solutions were originally at 24.6 degrees Celsius. After the reaction, the final temperature is 31.3 degrees Celsius. Assuming that all the solution have a density of 1.0g/cm3 and a specific heat capacity of 4.18 J/oCg, calculate the enthalpy change for the neutralization of HCl by NaOH. Assume that no heat is lost to the surroundings or to the calorimeter.
Answer:
Explanation:
mass of the solution = volume x density = 200 x 1 = 200 gm
heat absorbed = m x s x Δ t , s is specific heat , Δt is rise in temperature
= 200 x 4.18 x ( 31.3 - 24.6 )
= 5601 J .
This is the enthalpy change required.
A tank contains 120.0 g chlorine gas (Cl2), which is at temperature 76.0°C and absolute pressure 5.70 ✕ 105 Pa. The temperature of the air outside the tank is 19.0°C. The molar mass of Cl2 is 70.9 g/mol. (a) What is the volume of the tank (in m3)? m3 (b) What is the internal energy of the gas (in J)? J (c) What is the work done by the gas (in J) if the temperature and pressure inside the tank drop to 31.0°C and 3.80 ✕ 105 Pa, respectively, due to a leak? (Assume that the air outside the tank can be treated as a vacuum.)
Answer:
Explanation:
Given that:
mass of chlorine gas = 120.0 g
the molar mass of Cl₂ = 70.9 g/mol
The number of moles of chlorine gas = mass/molar mass
The number of moles of chlorine gas = 120.0 g / 70.9 g/mol
The number of moles of chlorine gas = 1.69 mol
Pressure = [tex]5.70 \times 10^5 \ Pa[/tex]
Temperature = 19.0°C = (273 + 76) K = 349 K
Universal Gas constant R = 8.314 J/mol/K
Using Ideal gas equation:
PV = nRT
V = nRT/P
V = (1.69 × 8.314 × 349)/ [tex]5.70 \times 10^5[/tex]
V = 4903.68034/ [tex]5.70 \times 10^5[/tex]
V = 0.008603 m³
Thus, the volume V of the tank = 0.008603 m³
For diatomic gas, the internal energy can be calculated by using the formula:
internal energy [tex]E_{int}[/tex] = [tex]\dfrac{5}{2} \times nRT[/tex]
internal energy [tex]E_{int}[/tex] = [tex]\dfrac{5}{2} \times 1.69 \times 8.314 \times 349[/tex]
internal energy [tex]E_{int}[/tex] = 12259.2 J
If there is a temperature and pressure drop;
the new temperature = 31.0°C = (273 + 31) K = 304 K
the new pressure = [tex]3.80 \times 10^5 \ Pa[/tex]
We need to understand that the aftermath of the reduction in chlorine gas resulted in a decrease in temperature and pressure. Since nothing is affecting the volume of the chlorine gas, then there is no work done.
Thus, work done will be zero because there is no change in the volume or an isochoric process.
Which starch solution will decrease in volume as osmosis occurs?
Which of the following notations is the correct noble gas configuration for
Co?
A. [Ar]48237
B. [Ar]4524p63d
O C. [Kr]4s24p64d
D. [Co]48237
Answer:
The notation of configuration of Co is [tex][Ar] 3d^7 4s^2[/tex]
(A) is correct option.
Explanation:
Given that,
The following notations is the correct noble gas configuration for Co.
(A). [Ar] 3d⁷ 4s²
(B). [Ar] 4s² 4p⁶ 3d
(C). [Kr] 4s² 4p⁶ 4d
(D). [Co] 3d⁷ 4s²
We know that,
Cobalt :
Co is the symbol of cobalt which is a chemical element.
Atomic number of Co is 27.
We need to find the notation of the configuration of noble gas Co
Using configuration
[tex]Co_{27}=2, 8, 15, 2[/tex]
[tex]Co_{27}=1s^2, 2s^2,2p^6, 3s^2 3p^6 3d^7, 4s^2[/tex]
So, we can write as the notation of noble gas configuration
[tex]Co_{27}=[Ar] 3d^7 4s^2[/tex]
Hence, The notation of configuration of Co is [tex][Ar] 3d^7 4s^2[/tex]
(A) is correct option.
What molecules does a plant need to make glucose in the process of photosynthesis? Choose all correct answers. carbon dioxide light oxygen water
Answer: carbon dioxide and water.
Explanation: I took the test
Answer:
water and carbon dioxide
Explanation:
i took the K12 test :p
16H + 2MnO4 + 5C2O4 = 2Mn + 10CO2 + 8H2O MnO4 mol in 20 mL
Answer:
Titration of 50.00 mL of 0.0521 M sodium oxalate, Na2C2O4, required 38.71 mL of a potassium permanganate solution: 5 C2O42- + 2MnO4- + 16H+ = 2Mn2+ + 10 CO2 + 8H2O Calculate the molarity of the potassium permanganate solution.
Explanation:
If m and n are integers, which of the following must be an even integer? A. 2mn B. mn C. mn+2 d. mn-2 e. 3mn
What is required for sexual reproduction to occur? an individual that produces sperm and an individual that produces eggs an individual that produces sperm and an individual that produces spores an individual that produces buds and an individual that produces spores an individual that produces buds and an individual that produces eggs
Answer:
It is A.
Explanation:
I hope this helps have a great day.
Answer:
A
Explanation:
an individual that produces sperm and an individual that produces eggs
you need egg and sperm for a new offspring aka a zygote
Which subatomic particle is positively charged?
Proton
Neutron
Electron
19. The air, soil, and most foods and beverages are examples of _____. mixtures compounds pure substances elements
What is the mass of an atom with seven protons, seven neutrons, and eight electrons?
Answer:
14
Explanation:
mass number = protons + neutrons
If 2.03 g of oxygen react with carbon monoxide, how many grams of CO2 are formed?
Answer:
The suitable equation for this reaction is
2CO + O₂ -----> 2CO₂
Here, we are given that we have 2 grams of O₂
From the equation, we can see that 2 * Moles of O₂ = Moles of CO₂
Moles of O₂:
2/32 = 1/16 moles
Therefore, the number of moles of CO₂ is twice the moles of O₂
Moles of CO₂ = 2 * 1/16
Moles of CO₂ formed = 1/8 moles
Mass of CO₂ formed = Molar mass of CO₂ * Moles of CO₂
Mass of CO₂ formed = 44 * 1/8
Mass of CO₂ formed = 5.5 grams
Kindly Mark Brainliest, Thanks!!!
How many elements are there in CH3 CH2COONa
Answer:
There are
Explanation:
There are 10 elements in CH3CH2COONa.
NH3 + HCI —> NH4CI synthesis O decomposition O single replacement O double replacement
Answer:
synthesis
Explanation:
The reaction given is a synthesis reaction or combination reaction.
Given equation:
NH₃ + HCl → NH₄Cl
In a synthesis reaction, a single product is formed from two or more reactants
A + B → C
The formation of compounds from the union of constituent elements also falls into this category.
So the given reaction is a synthesis reaction.
In a decomposition reaction two or more products are formed from a single reactant
In a single replacement reaction, one substance replaces another.
In double replacement reactions partners in a chemical specie are exchanged.
Therefore the given reaction is a synthesis reaction
1pt Which part of the scientific method helps you figure out what you've learned?
O A. Predict
OB. Observe
O c. Design
OD. Analyze
Which structures are found only in plant cells, not in animal cells? O A and B O Band C O Cand D B D OD and A А с
Answer:B and C
Explanation:did the assignment
How is energy related to the change of state represented
by the model?
Atoms gain energy as a solid changes to a liquid.
Atoms gain energy as a solid changes to a gas.
O Atoms lose energy as a solid changes to a liquid.
O Atoms lose energy as a solid changes to a gas.
Answer:
Energy is related to the change of state represented by the model in this way - C. Atoms lose energy as a gas changes to a solid.
Explanation:
As a certain gas is changing its state into that of a solid material, its atoms are going to lose some energy.
Answer:
the answer is c
Explanation:
the person before me literally tells you that it's C!!
A student is in class 400 minutes every day for 5 days each week. How many seconds
Is this?
Conversion factors: 1 day = 24 hours; 1 hour = 60 minutes; 1 minute = 60 seconds
120,000 sec
1,200,000 sec
12,000 sec
60,000 sec
If a student is in class 400 minutes every day for 5 days each week, then there would be 120000 seconds, therefore the correct answer is option A.
What is multiplication?Finding the product of two or more numbers in mathematics is done by multiplying the numbers. It is one of the fundamental operations in mathematics that we perform on a daily basis.
As given in the problem If a student is in class 400 minutes every day for 5 days each week,
The number of minutes a student in class in a day = 400 minutes
The number of seconds a student in class in a day = 400 × 60 seconds
The number of seconds a student in class in a week = 400 × 60 × 5 seconds
The number of seconds a student in class in a week = 120000 seconds
Thus, the correct answer is option A.
To learn more about multiplication here, refer to the link;
https://brainly.com/question/10520264
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What is described by the VSEPR theory?
O A. The arrangement of atoms in a molecule
B. The oxidation numbers of atoms in a molecule
C. The kind of bonds formed in a molecule
O D. The outside forces operating on a molecule
Answer:
A
Explanation:
Apex
The arrangement of atoms in a molecule is described by the VSEPR theory.
What is an atom?
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
Learn more about atom,here:
https://brainly.com/question/13654549
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If 110. grams of potassium carbonate (K2CO3) is dissolved into 300. mL of solution, what is the molarity of the solution?
Answer:
2.65 M
Explanation:
Convert grams of K₂CO₃ to moles. The molar mass is 138.205 g/mol.
(110 g)/(138.205 g/mol) = 0.796 mol
Convert milliliters of solution to liters.
300 mL = 0.300 L
Divide moles of K₂CO₃ by liters of solution.
0.796 mol/0.300 L = 2.65 mol/L = 0.265 M
Answer:
2.7 M
Explanation:
M=moles of solute/volume of solution (L)
First, you need to calculate the number of moles using the given mass and the molar mass.
110 g138.205 g/mol=0.80 mol
Then, you can solve for molarity using the molarity equation.
M=0.80 mol0.300 L=2.7 M
Remember, you need to convert mL to L before you can calculate molarity.
HELPPPP MEEE PLEASEEE!!!!!!
If you have 40 protons, 30 neutrons, and 42 electrons, which of the following is
true? (There are multiple answers!) *
Mass = 40
Mass = 70
Mass = 82
Mass = 112
Charge = -2
Charge = +2
Charge = +10
Charge = -10
Which of the following contains the most electrons?
multiple choice
A - Sn2+
B - Sna+
C - Both have the same number of electrons
What is a scientific law?
Answer:
Scientific laws or laws of science are statements, based on repeated experiments or observations, that describe or predict a range of natural phenomena. The term law has diverse usage in many cases across all fields of natural science.
Suppose you buy some inflated party balloons that are at room temperature (about 20°C). What will happen to those
balloons if you take them outside on a cold day? Explain
Answer: Balloons taken outside on a cold day will shrink because, as the temperature decreases, the pressure and volume decrease also.
Explanation:
How many kilojoules are needed to raise the temperature of 234 g of water from 19.8 C to 33.1 C?
Answer:
13 kJ
Explanation:
Use the following formula where Q is the Joules needed, m is the mass of the substance, c is the heat capacity, and ΔT is the change in temperature.
Q = mcΔT
The heat capacity of water is 4.186 J/g°C. The mass of water is 234 g. The change in temperature is 13.3°C.
Q = mcΔT
Q = (234 g)(4.186 J/g°C)(13.3°C)
Q = 13,027 J
Since the answer is in Joules, convert to kiloJoules.
13,027 J = 13.027 kJ ≈ 13 kJ
PSYCHOLOGYDescribe how sensation and perception work together.
Answer:
Perception is the psychological process in which sensory input is organized and interpreted into meaningful information. The sensory and perceptual processes work together so that organisms can make sense out of objects or events that appear in their environment. For example, when looking at a cat, one senses a combination of shapes and colors. The mind instantly processes these visual sensations into something meaningful, letting one know it's a cat.
Explanation:
^^
Answer:
Perception is the psychological process in which sensory input is organized and interpreted into meaningful information. The sensory and perceptual processes work together so that organisms can make sense out of objects or events that appear in their environment. For example, when looking at a cat, one senses a combination of shapes and colors. The mind instantly processes these visual sensations into something meaningful, letting one know it's a cat.
Explanation:
Edge 2021
type of force assessment for midd school
Conclusion of Newton law of motion
Answer:
Hope this helps
Explanation:
All object continues to be in its state of rest or uniform motion unless acted upon by an external unbalanced force. The rate of change of momentum of an object is proportional to the unbalanced force in the direction of the force. 3rd law every action has an equal and opposite reaction.
Which determines the reactivity of an alkali metal?
A) its boiling and melting points
B) the shininess of its surface
C) the number of protons it has
D) its ability to lose electrons
ill give brainliest
Answer:
D
Explanation:
It only has one valence electron.
4. A sample of nitrogen at 20 degrees Celsius was compressed to 300ml to
0.360mL and its new pressure was found to be 400 Pa. What was the
initial pressure in kPa?
Answer:
We are given:
V(i) = 0.3 L V(f) = 0.36 L
P(i) = x pa P(f) = 400 pa
T(i) = T(f) = 293 k
Using the gas formula:
PV = nRT
Since n , R and T are constant,
PV = k (where k is a constant)
Hence we can say that:
P(i) * V(i) = P(f) * V(f)
x * 0.3 = 0.36 * 400
x = 14.4/0.3
x = 480 pascals
Hence the initial pressure is 480 pascals
Converting to Kpa, we have to divide by 1000
Initial pressure (Kpa) = 0.48
Apples are peeled, cored, and pureed to produce an unpasteurized applesauce. The applesauce must be heated to 96°C to ensure that it is microbiologically stable for hot fill packaging. A tube-in-tube heat exchanger is used to heat the applesauce (Cp = 3.83 kJ/kgK) from an initial temperature of 10°C to the target temperature. Steam at 130°C with 70% quality is used as the heating medium with the condensate leaving the heat exchanger at 130°C.
How much steam (mass flow rate in kg/hr) is required per kilogram of applesauce processed?
