Paragraph 2 discusses two different types of thermochemical reactions. In one type of
reaction, the enthalpy term is located on the reactant side of the equation. Which type of
reaction is this?
Answers
Answer: The reaction is endothermic.
Explanation:
Endothermic reaction : It is a type of chemical reaction where the energy is absorbed from the surrounding. In the endothermic reaction, the reactant have less energy than the energy of products
In endothermic reaction, enthalpy terms is located on the reactant side.
Example: [tex]A+B+energy\rightarrow C+D[/tex]
Exothermic reaction : It is a type of chemical reaction where the energy is released into the surrounding. In the exothermic reaction, the energy of reactants are more than the energy of products
In exothermic reaction, enthalpy terms is located on the product side.
Example: [tex]A+B\rightarrow C+D+energy[/tex]
Related Questions
To prepare 800mL of 1M phosphate buffer of pH 7.2 (PKa=7.1), by using salt = K2HPO4 and acid = KH2PO4, the quantity of salt required is
Answers
Answer:
78.04g of 0.448 moles must be added
Explanation:
Using H-H equation we can find the pH of the buffer:
pH = pKa + log [A⁻] / [HA]
Where pH is the pH of the buffer = 7.2
pKa = 7.1
[A⁻] = [K₂HPO₄]
[HA] = [KH₂PO₄]
Replacing:
7.2 = 7.1 + log [K₂HPO₄] / [KH₂PO₄]
0.1 = log [K₂HPO₄] / [KH₂PO₄]
1.2589 = [K₂HPO₄] / [KH₂PO₄] (1)
And as the concentration of the buffer is:
1M = [K₂HPO₄] + [KH₂PO₄] (2)
Replacing (2) in (1):
1.2589 = 1M - [KH₂PO₄] / [KH₂PO₄]
1.2589 [KH₂PO₄] = 1M - [KH₂PO₄]
2.2589 [KH₂PO₄] = 1M
[KH₂PO₄] = 0.44M
And [K₂HPO₄] = 0.56M
In 800mL = 0.8L:
0.8L * (0.56mol / L) = 0.448 moles K₂HPO₄. The mass is -Molar mass K₂HPO₄: 174.2g/mol-:
0.448 moles * (174.2g / mol) =
78.04g of 0.448 moles must be addedSilver nitrate, AgNO3, is which type of matter?
A. Element B. Compound C. Heterogeneous mixture D. Homogeneous mixture
Answers
Silver nitrate, AgNO₃ is a compound which is a type of matter as it is made up of more than one type of element.
What is a compound?
Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
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please help, I'm lost
Answers
advantages of solar energy
Answers
reduces electric bills
low maintenance costs
reduced needs for fossil fuels and foreign oils
A prescription is written for 500 mL of a 7% NaCl solution. The technician has a 50% NaCl solution. What volume of
50% NaCl is required for the 7% solution?
mL
Answers
Answer:
70 mL
Explanation:
To solve this problem we can use the C₁V₁=C₂V₂ equation, where the subscript 1 refers to the concentrated solution while subscript 2 refers to the diluted one, as follows:
C₁ = 50V₁ = ?C₂ = 7V₂ = 500 mLWe input the data:
50 * x = 7 * 500 mLAnd solve for x:
x = 70 mLThus the answer is 70 mL.
A face centered cubic cell has an edge length of 495 pm. What is that atomic radius?
Answers
Answer:
r = ¼a√2
Explanation:
For a face centered cubic cell, which we call FCC, the atoms at the face diagonals touch each other.
Now, If we denote the edge length of cube to be "a" and the radius of the atom is denoted as "r", as seen in the attached FCC cell:
(√2)a = 4r
Divide both sides by 4 to get;
r = ¼a√2
What is the equation and molecular weight of Scandium (II) Sulfite? Not sulfide
Answers
Explanation:
Molecular Formula
S3Sc2
Synonyms
Scandium sulfide
Scandium sulfide (Sc2S3)
Discandium trisulphide
Molecular Weight
186.1 g/mol
What is the name for Mo(PO3)2
Answers
Copper(II) Phosphite Cu3(PO3)2 Molecular Weight -- EndMemo.
Copper(II) Phosphite is the IUPAC name of the given compound. Ionic compounds don't get prefixes like di-, tri- etc.
International Union of Applied and Pure Chemistry is referred to as IUPAC. The IUPAC establishes the standards for the atomic weights that are shown on the periodic table and is the acknowledged authority for chemical nomenclature, measurements, including atomic mass values. Although IUPAC produces publications in many scientific domains, including physics, biology, and chemistry, it is most recognised for its work standardising nomenclature in the chemical sector. Standardising code names for nucleotide base sequences is one of the significant things the IUPAC has achieved in these areas. Copper(II) Phosphite is the IUPAC name of the given compound.
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How many molecules are in 83.2 g of chlorine gas (Cl2)?
Group of answer choices
1.42 x 10^24 molecules
1.78 x 10^28 molecules
7.04 x 10^23 molecules
14.2 x 10^24 molecules
Answers
Answer:
try all of them
1.42 x 10^24 molecules
1.78 x 10^28 molecules
7.04 x 10^23 molecules
14.2 x 10^24 molecules
Explanation:
Which is a reason that a chemical engineer would use a rate law for a reaction in a chemical plant?
A. to calculate the amount of product that would form
B. to find out which reactant would be used up fastest
C. to see how a change in a reactant concentration would affect the speed of the reaction
D. to determine how to adjust the concentrations of reactants to make the correct product
Answers
Explanation:
to see how a change in a reactant concentration would affect the speed of the chemical reaction
Gold has a specific heat of 0.129 J/g °C. How many joules of heat energy are
required to raise the temperature of 23 grams of gold from 22 °C to 98
°C?
Look at picture
ASAP please will mark as brainlist don’t got much time
Answers
Answer:
210.657J
Explanation:
joules of heat energy needed= 23×0.129×(93-22)
=210.657J
can someone please help!? i’ll mark you as brainliest
Answers
Answer:
26
Explanation:
Answer:
Reactants: NaBr and CA(OH)2
Products: CaBr and NaOH
Explanation:
Reactants are always on th left side of the equation and products on the right side
cell are the blank unit of all living organisms
Answers
PLS HELPPPP OMG PLSPLSPLSPLSPLS
Answers
Answer:
D 44.8 L liters of hydrogen gas
2. (10 Points) Several fast-acting medications are sold as powders, sometimes
inside soluble capsules. Why would these medications act faster than solid
tablets?
Answers
The medications like capsules act faster because of their increased surface area which helps them to absorb quickly.
What is a capsule?Encapsulation in the manufacture of pharmaceuticals refers to a range of dosage form techniques that are used to enclose medicine in a relatively stable shell called a capsule.
The two main types of capsules are Hard-shelled capsules and Soft-shelled capsules. Hard-shelled capsules contain dry, powdered ingredients made by processes such as extrusion, and spheronization.
Soft-shelled capsules are primarily used for oils and for active ingredients that are dissolved in oil. Both types of capsules are made from aqueous solutions of gelling agents, such as animal protein or plant polysaccharides.
The size of particles and the additive properties affect the rate of the dissolution or absorption of the drug. As the surface area of the capsule is greater than the solid tablets so they absorb faster than tablets.
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What is the difference between endothermic and exothermic reaction (shortest answer)
Answers
Answer:
An exothermic process releases heat, causing the temperature of the immediate surroundings to rise. An ethothermic process absorbs heat and cools the surroundings. Hope this helped.
The easiest way to explain endo and exothermic reactions are that endothermic reactions absorb energy and exothermic reactions release energy.
The way I remember this is that with exothermic reactions, the heat exits. Endothermic is just the opposite.
Hope this helps :)
why do animals need carbohydrates in their diets
Answers
Answer:
Carbohydrates are energy-providing feed components composed of carbon, hydrogen, and oxygen. They should make up about 75 percent of an animal's diet. The energy they provide powers muscular movements. Carbohydrates also produce the body heat that helps keep the animal warm.
PLS HELP ASAP Solar energy causes most of the water ___________________ on Earth’s surface?
Answers
How do you know when a redox equation is balanced?
Answers
PLEASE HELP ASAP I WILL GIVE BRAINLIEST!
Which statement describes a catalyst?
A) catalysts appear as reactants in a chemical equation.
B) catalysts are completely consumed by the reaction.
C) catalysts provide a lower energy pathway for the reaction.
D) catalysts speed up chemical reaction by increasing surface area.
Answers
Answer:
it's D) catalyst speed up chemical reaction by increasing surface area
Explanation:
sorry if I'm wrong
In addition to the two types of motion found in liquids, gases have
What kind of motion
Answers
Answer:
In liquids, particles are quite close together and move with random motion throughout the container. Particles move rapidly in all directions but collide with each other more frequently than in gases due to shorter distances between particles.
Which state of matter has the most movement of its particles?
Answers
Answer:
solids...............
Calculate and give the answer with the correct number of significant
figures.
3.256 / 2.7
Answers
3.256 × 10
__________
2.7 × 10
32.56
____
27
= 1.2059259259
An example of an abiotic factor that would strongly affect the population of water lilies in a pond?
Answers
Answer:
temperature, light or pH
Explanation:
Water can exist in all three states of matter.
Describe the arrangement and movement of particles in each of the three states of matter. Explain what happens to the particles in a liquid during boiling.
I'll give someone brainly and thanks if they answered the question correctly. 30 points!!
Answers
Answer:
The particles in a liquid move very quickly due to heat while it is boiling and gradually turns to gas
A 367.8 g sample of potassium chlorate was decomposed according to the following equation:
2KClO3 -->2KCl + 3O2 How many moles of oxygen are formed?
a 2.5 mol
b 4.5 mol
c 1.0 mol
d 3.0 mol
Answers
A certain compound has an empirical formula of CH3. What must be true about this compound?
Answers
Answer:
A.
It contains three times as many hydrogen atoms as carbon atoms.
B.
It consists of 75% hydrogen by mass.
C.
Each molecule contains exactly four atoms.
D.
Each carbon atom is bonded to three hydrogen atoms.
Explanation:
it has 75% Hydrogen by mass
If we assume CH3 as 100% which is 4 parts.
Then 3 parts corresponds to Hydrogen which is 75% and remains is carbon,25 %
What is the relationship
between the pancreas, the
stomach, and the
esophagus?
They are all part of the
circulatory system.
They are all part of
the nervous system.
They are all part of
the digestive system.
D
They are all part of the
respiratory system.
Type here to search
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1
10:40 AM
2/11/2021
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Answers
Answer:
The stomach, gallbladder, and pancreas work together as a team to perform the majority of the digestion of food. Food entering the stomach from the esophagus has been minimally processed — it has been physically digested by chewing and moistened by saliva, but is chemically almost identical to unchewed food
1.52 moles of gas are at a pressure of 99.5kPa and a temperature of 298K. What is the volume of the gas
Answers
Answer:
5
Explanation:
answer my last question plz
Gravity is responsible for the
Orbiting path of the panets around the sun.
Rotation of a planet on its rotation axis.
Tilt of Earth's axis.
Pheses of the moon.