Answer: Chemistry is the properties, composition, and structure of elements and compounds, how they can change, and the energy that is released or absorbed when they change.
Explanation:
Answer:
The scientific study of the structure of substances and what happens to them in different conditions or when mixed with each other is known as Chemistry.
Please mark my answer the brainliest and rate me 5 star and follow me.When 2.499 g of AX (s) dissolves in 135.3 g of water in a coffee-cup calorimeter the temperature rises from 23.6 °C to 35.2 °C. Calculate the enthalpy change (in kJ/mol) for the solution process. AX space (s )space rightwards arrow straight A to the power of plus (a q )space plus space straight X to the power of minus space (a q )Assumptions for this calculation: The specific heat of the solution is the same as that of pure water (4.18 J/gK) The density of water = 1.000 g/mL The liquid’s final volume is not changed by adding the solid The calorimeter loses only a negligible quantity of heat. The formula weight of AX = 59.1097 g/mol. Be sure you include the correct sign for the enthalpy change.
Answer:
The enthalpy change for the solution process [tex]\Delta H_{rxn}[/tex] = - 158.34 kJ/mol
Explanation:
Given that:
The mass of salt AX = 2.499 g
The mass of water = 135.3 g
The mass of the solution = ( 2.499 + 135.3 ) g = 137.799 g
The specific heat of salt solution s is known to be = 4.18 J/g° C
The change in temperature i.e. ΔT = 35.2 °C - 23.6 °C = 11.6 °C
Thus, the amount of heat raised is equal to the heat absorbed by the calorimeter.
∴
[tex]q_{reaction} = q_{solution}[/tex]
[tex]q_{reaction} = -ms_{solution} \Delta T[/tex]
[tex]q_{reaction} = -137.799 \ g \times 4.18 \dfrac{J}{g^0C}\times 11.6^0C[/tex]
[tex]q_{reaction} = - 6682 \ J[/tex]
[tex]q_{reaction} = - 6.682 \ kJ[/tex]
Recall that the mass of the salt = 2.499 g
The number of moles of the salt = [tex]2.499 \ g \times \dfrac{1 \ mol \ of \ AX}{59.1097 \ g}[/tex]
= 0.0422 mol of AX
Finally the enthalpy change, [tex]\Delta H_{rxn} = \dfrac{- 6.682 \ kJ}{ 0.0422 \ mol}[/tex]
= - 158.34 kJ/mol
The enthalpy change for the solution process [tex]\Delta H_{rxn}[/tex] = - 158.34 kJ/mol
what is not a part of the digestive system
Answer: The spleen plays multiple supporting roles in the body. It acts as a filter for blood as part of the immune system
Explanation:
Answer:
The Pancreas is an organ located in the abdomen. It is not a part of the human digestive system, although it does produce the pancreatic juices that act as enzymes to HELP in digestion. In other words, the Pancreas plays an important role in converting the food we eat into fuel for the body's cell.
Calculate the degree of hydrolysis of a 02.M solution of NaHCO3. Ka1 = 4.3x10-7 and Ka2 = 4.8x10-11.
The degree of hydrolysis of 02.M solution of NaHCO₃ = 2.33 * 10⁻⁸
Given data :
Concentration of NaHCO₃ = 0.2 M
Ka1 = 4.3 * 10⁻⁷
Ka2 = 4.8 * 10⁻¹¹
Determine the degree of hydrolysisNaHC0₃ ----> Na⁺ + HCO₃
where : Na⁺ is a stronger and HCO₃ is weaker
Therefore;
hydrolysis will occur at HCO₃
HCO₃ + excess water --> H₂CO₃ + OH⁻ --- kh
kh = hydrolysis constant
Also
Kh = Kw / Ka1
where ; Kw = ionic product of water ( 10⁻¹⁴ ) , Ka1 = dissociation constant
Finally the degree of hydrolysis is
Kh = ( 10⁻¹⁴ ) / 4.3 * 10⁻⁷
= 2.33 * 10⁻⁸
Hence we can conclude that The degree of hydrolysis of 02.M solution of NaHCO₃ = 2.33 * 10⁻⁸
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Listed in the Item Bank are some key terms and expressions associated with the categories seen in the Venn Diagram. To find out
more information about items, some have more details available when you click on them. Drag and drop each item onto the proper
area of the diagram. If an item describes more than one category, be sure to place it in the overlapping space.
ITEM BANK: Move to Bottom
A ball is thrown up into the air and rises
until it begins to fall
Ball on the edge of a cliff
Can be transformed into other form of
energy
Gravitational, elastic, chemical
Increases with mass
Kinetic Energy
Both
Potential Energy
Based on the item bank, the various classification for each item are:
Both (Kinetic energy and Potential energy):
Increases with mass.Can be transformed into other form of energy.A ball is thrown up into the air and rises until it begins to fall.Potential energy:
Gravitational, elastic, chemical.What is energy?Energy can be defined as the ability to do work. Thus, energy must be possessed or transferred to an object or physical body before it can be used in doing a work or heating a system.
The forms of energy.In Science, there are different forms of energy and these include the following;
Gravitational energyPotential energyElastic energyChemical energyKinetic energyThe classification of the items.Both (Kinetic energy and Potential energy):
Increases with mass.Can be transformed into other form of energy.A ball is thrown up into the air and rises until it begins to fall.Potential energy:
Gravitational, elastic, chemical.Read more on potential energy here: https://brainly.com/question/1242059
How many atoms are in 3.5 L of Neon at STP? Show your work!
Answer:
This is the answer to the question 0.1734
Explanation:
3.5/20.18
=0=1734
What is the mass of a neutron close to
Answer:
The free neutron has a mass of 939,565,413.3 eV/c2, or 1.674927471×10−27 kg, or 1.00866491588 u. The neutron has a mean square radius of about 0.8×10−15 m, or 0.8 fm, and it is a spin-½ fermion.
Mass: 1.67492749804(95)×10−27 kg; 939.56542052(54) MeV/c2; 1.00866491588...
Composition: 1 up quark, 2 down quarks
Electric charge: 0 e; (−2±8)×10−22 e (experimental limits)
Magnetic polarizability: 3.7(20)×10−4 fm3
what is dalang puppeteer
Write the equation for the reaction of carbonic acid with hydroxide to produce hydrogen carbonate and water
Answer:
HCO3− + OH− ⇌ CO32− + H2O (fast)
Between pH values of 8 and 10, all the above equilibrium reactions are significant
NEED HELP ASAP!!!! Select 3 pieces of evidence listed in the article that show how human behavior impacts the planet.
Question 4 options:
Development of synthetic drugs and fabrics
Increased biodiversity and fewer extinctions
Nuclear energy and bomb testing
Increased nitrogen fixation
Answer:
Development of synthetic drug and fabric
Nuclear energy and bomb testing
Increased nitrogen fixation
Explanation:
This is because these things help global warming and animal extinction
1. What is contained in the nucleus of an atom?
A. Protons only
B. Electrons only
C. Electrons and Protons
D. Protons and Neutrons
Answer:
Your answer is
D. Protons and Neutrons
Hope you have a great day!
Answer:
Protons and neutrons
Explanation:
Let's know some
Protons are positively charged particlesNeutrons are neutral charged particlesElectrons are negatively charged particles.Mass number of a element=No of protons+No of neutrons
during a storm, a tree fell over into a river. use evidence to support your explanation of what happened to the tree?
Answer:
The wind knocked it over.
Explanation:
This is true because in many storms, there are very high wind speeds.
helppp
Balancing Equation
Answer:
Answer: C3H8 + 5O2 → 3CO2 + 4H2O.
Explanation:
A 12 kilogram eagle is flying at 15 meters/sec. What is the kinetic energy (in joule) of the eagle? Use exact numbers; do not estimate.
The kinetic energy J of the eagle is mathematically given as
K.E=1350
What is the kinetic energy (in joule) of the eagle?Question Parameters:
A 12-kilogram eagle is flying at 15 meters/sec.
Generally, the equation for the kinetic energy is mathematically given as
K.E=1/2mv^2
Therefore
K.E=1/2(12)(15)^2
K.E=1350J
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7. Which of the following medications should most likely not be taken prior to
operating heavy machinery?
a. Penicillin (antibiotic)
b. Famotidine (stomach)
C. Diphenhydramine (Benadryl)
d. Hydrochlorothiazide (diuretic)
Diphenhydramine medications should be taken by person who operate heavy machinery.
What is Medications?Medications refers to drugs or substances taken into the body to relieve of pains or symptoms of diseases.
What is Diphenhydramine?Diphenhydramine is also called Benadryl and is antihistamine take to relieve symptoms of pains, allergy, hay fever, and the common cold symptoms like cough, sneezing, sore throat, cold , cattarh and so on. It is used to treat dizziness, nausea, vomiting and motion sickness. Diphenhydramine can be taken to relax the body and fall asleep.
Therefore, Diphenhydramine medications should be taken by person who operate heavy machinery because it will help relive pains and symptoms of cold which can be due to vigorous activity of operating heavy machinery.
Learn more about Diphenhydramine from the link below.
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Like liquids gases have definite shape and valume true or false?
Answer:
False
Explanation:
A gas has neither a definite shape nor a definite volume.
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What is heat energy indirectly measured by?
A. temperature
B. recording the motion of molecules
C. kinetics
Answer:
Temperature
Explanation:
.
Answer:
a
Explanation:
I just took the test
what is the correct name for Sn3(PO4)2
What about Kevlar makes it so strong? (1 point)
A. Kevlar is made with spider silk, a naturally strong material.
B. The molecules stack together in crystal-like structures.
C. The molecules are short and create density
D. The molecules in Kevlar form a cylindrical-like structure.
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I believe the answer is (B) as molten Kevlar when spun into fiber, its polymers have a crystalline arrangement.
Hope that helped!
Answer:
The molecules stack together in crystal-like structures
Explanation:
i've taken the test
Calculate the volume of the gas, in liters, if 1.35 mol
has a pressure of 1.30 atm
at a temperature of -6 ∘C?
Answer:
22.8 L
Explanation:
Step 1: Given data
Moles of the gas (n): 1.35 molPressure of the gas (P): 1.30 atmTemperature (T): -6°CIdeal gas constant (R): 0.0821 atm.L/mol.KStep 2: Convert "T" to Kelvin
We will use the following expression.
K = °C + 273.15 = -6 + 273.15 = 267 K
Step 3: Calculate the volume of the gas
We will use the ideal gas equation.
P × V = n × R × T
V = n × R × T / P
V = 1.35 mol × (0.0821 atm.L/mol.K) × 267 K / 1.30 atm
V = 22.8 L
A store sell 21 piece of clothing every 45 minutes.How long will it take the store to sell 100 pieces of clothing?
Explanation:
21 piece =45 mins
100 pieces= x
on cross multiplication
21x=45×100mins
21x =4500mins
x =4500mins÷21
=214.3mins or 3.57hrs
Which two photos show electric force in action?
D A
O B.
OC
D D
Answer:
b and d show electric force in action
Explanation:
An ionic compound dissolves easily in water because
a.) the ionic lattice collapses.
b.) the ions changed their composition.
c.) the ions are separated by the water molecules in the solution.
d.) the ionic lattice becomes disordered. I
Answer:
I say.... C.
Explanation:
Ionic compounds dissolve in water if the energy given off when the ions interact with water molecules compensates for the energy needed to break the ionic bonds in the solid and the energy required to separate the water molecules so that the ions can be inserted into solution.
Hope it helps!~ (Sorry if you get it wrong or I got it wrong-)
~The Confuzzeled homan
HELP ME OUT PLS!!!!!!
During the first half of the lunar cycle, the amount of light visible to Earth gets larger and larger. During this half of the cycle, the moon is said to be:
O eclipse
O rotation
O waning
O waxing
50 POINTS WILL GIVE BRAINLYEST!!!!!!!!!
If you are holding a really hot cup of hot chocolate, the heat from the mug will transfer to your hand.
Question 6 options:
True
False
Answer:
true
Explanation:
Heat travels from the hot cocoa in the cup to your hands. No energy is transferred. Heat is transferred from your hands to the hot cocoa in the cup.
If you are holding a really hot cup of hot chocolate, the heat from the mug will transfer to your hand is a true statement.
What is the transfer of heat?Heat transfer is any or all of a variety of processes that are thought to function as mechanisms to move entropy and energy from one place to another. Common names for the specific mechanisms include convection, heat radiation, and conduction (see thermal conduction).
The heat always transfers from a hot body to a cold body. The heat transfer from hot the cup to the hands until the temperature of the hand and the cup will be the same. There are three types of transfer of heat.
Therefore, it is true that the heat from the mug will travel to your hand if you are holding an extremely hot cup of hot chocolate.
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Which is an example of kinetic energy?
0 A
an arrow in flight
B..a ball right before it is dropped
c. a warm bicycle chain
D. a gallon of gasoline
A
I m not sure ...........................
The colors of fireworks are produced by metals
Answer:
True
Explanation:
Answer:
Yes
Explanation:
They are produced by heating metal salts eg. Aluminium it is used to produce silver and white flames and sparks.
HOPE IT HELPED
25. An element has two stable isotopes. One isotope has a mass of 62.9 amu and an abundance of 69.2%.
The other isotope has a mass of 64.9 amu and an abundance of 30.8%. Show how to calculate the
average atomic mass of this element and give the value with the correct units and significant figures.
Don't just give the answer. Show your work
Show work:
Answer:
Answer:
Average Atomic Mass= 63.5 amu
Explanation:
Average Atomic Mass Equation:
(Mass 1)(% Abundance) +(Mass 2)(% Abundance)
Plug in Variables:
Make sure to convert the percentages into decimals. (Left two places)
Use the order of operations when solving.
(62.9)(0.692) + (64.9)(0.308) = AAM
Multiply each side
43.5268 + 19.9892 = AAM
Add the products together
63.516 = AAM
Add proper unit and satisfy the 3 significant figures needed
63.5 amu
The simple substances of matter are called:
molecules
elements
compounds
The correct answer is element
Copper, a metal known since ancient times, exists in two stable isotopic forms, 6329Cu (69.09%) and 6529Cu (30.91%). Their atomic masses are 62.93 amu and 64.9278 amu respectively. Calculate the average atomic mass of copper.
Answer:
Wt. Avg. Atomic Weight => 63.35457 amu
Explanation:
Given Isotopic %Abundance fractional Wt Avg
At. Mass (amu) abundance contribution
Cu-63 62.93 69.09 0.6909 43.4783
Cu-65 64.9278 20.0668 0.200668 20.0668
Wt Average of all isotopes = ∑Wt Avg Contributions
= 43.4783 amu + 20.0668 amu = 63.35457 amu
Which energy involves energy of motion or work?
kinetic energy or potential energy
kinetic energy
Explanation:
energy associated with motion is kinetic energy
Answer: Kinetic Energy
Explanation: Kinetic energy is the energy of mass in motion. The kinetic energy of an object is the energy it has because of its motion. ... Note that energy is a scalar quantity, i.e., it does not depend on direction, and it is always positive.