During a phase change, temperature stays constant because the energy added is absorbed by the substance to break intermolecular forces, rather than increasing its kinetic energy. This process, known as latent heat, causes the molecules to undergo a structural rearrangement without temperature change until all the substance has transformed.
What is latent heat?When a substance undergoes a phase change, such as melting or boiling, the energy being supplied is used to overcome the forces between its molecules rather than increasing their kinetic energy. This energy is called latent heat.
The absorbed heat breaks intermolecular bonds, enabling the molecules to rearrange their structure. As a result, the temperature remains constant during this transformation until the entire substance has fully changed phases. After the phase change is complete, the temperature resumes increasing or decreasing, depending on the direction of the phase transition.
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Which of the following solute(s) would form an electrolytic solution in water? CH4, KI, fecl3
Answer:
kl
Explanation:
According to the concept of solubility and electrolysis , KI would form an electrolytic solution in water.
What is solubility?Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.
The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.
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Given the equation: N2 +202->2NO2, what mass of oxygen is required to react completely
with 48.400 g of nitrogen?
Select one:
O a. 110.5
b. 76.0
O c. 96.76
Od. 214
Calculate the number of g of KCN that will react with 1.06 mol of HCl.
Answer:
68.9 g of KCN.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
KCN + HCl → KCl + HCN
From the balanced equation above,
1 mole of KCN reacted with 1 mole of HCl.
Next, determination of the number of mole of KCN needed to react with 1.06 moles HCl.
This is illustrated below:
From the balanced equation above,
1 mole of KCN reacted with 1 mole of HCl.
Therefore, 1.06 moles of KCN will also react with 1.06 moles of HCl.
Finally, we shall convert 1.06 moles of KCN to grams.
This can be obtained as follow:
Molar mass of KCN = 39 + 12 + 14 = 65 g/mol.
Mole of KCN = 1.06 moles
Mass of KCN =...?
Mole = mass /Molar mass
1.06 = mass of KCN / 65
Cross multiply
Mass of KCN = 1.06 x 65
Mass of KCN = 68.9 g
Therefore, 68.9 g of KCN is needed to react with 1.06 moles of HCl.
which of the following shows how rate depends on concentrations of reactants?
Answer:
option c
Explanation:
Rate = k(A)¹(B)²
Answer:
c
Explanation:
a p e xxxxxxxxx
Give the IUPAC name of the given compound.
(CH3)-CH(NH2)-CH3
this compound is called 2-propanamine 2 indicates the position of the amino group propan- indicates the radical (joy123333 do they make anyone a mod?)
What is DNA? A. A Carbohydrate B. A protein C. A nucleic acid D. A lipid
Answer:
C: a nucleic acid
Explanation:
The function of nucleic acids is to store and express genetic information. Since fragments of DNA called genes encode the information to produce certain proteins, they are classified as nucleic acids.
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When the equation below is balanced with the lowest possible whole number coefficients, what is the sum of the coefficients? Ca(s) + HCl(g) → CaCl2(s) + H2(g)
Answer:
ca(s)+hcj(g)cacI 2 (s)+H2(g)
Explanation:
The equation below is balanced with the lowest possible whole-number coefficients, the sum of the coefficients Ca(s) + HCl(g) → CaCl2(s) + H2(g) is
ca(s)+hcj(g)cacI 2 (s)+H2(g).
What is the sum of the coefficients when the equation for the combustion of ammonia is balanced using the smallest possible whole numbers?The sum of the coefficients is 2+3+4+3=12.
What type of reaction is Ca 2hcl → CaCl2 H2?Type of Chemical Reaction: For this reaction, we have a single displacement reaction. Balancing Strategies: In this reaction Calcium (Ca) metal is reacting with Hydrochloric acid (HCl). the Ca replaces the H in HCl and we end up with CaCl2 and H2.
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Why is warm honey easier to pour than cold honey?
A) Increasing the temperature breaks the molecules down into atoms, which are smaller.
B) Increasing the temperature increases the kinetic energy of the molecules, which makes it easier to overcome the attractive forces between molecules.
C) Increasing the temperature converts the sugars into water, which flows easier.
D) Increasing the temperature makes the honey more viscous.
Explanation:
Warm honey is easier to pour because the molecules or what we call as atoms are tightly packed in solids and when solids convert into liquid they flow easily.I HOPE YOU MIGHT FIND THIS VERY HELPFULLWITH LOVE FAULTYDEVILLOVE YA......warm honey easier to pour than cold honey due to Increasing the temperature converts the sugars into water, which flows easier.
What are the components of honey ?
Honey contains sugar, water and other ingredients, where Sugar gives gives sweetness, water maintain fluidity, and other components are present in a least amount and the differences are the color, aroma and taste.
Three types of sugar such as fructose (41%), grape sugar or glucose about 34% and sucrose contain 1 and 2%, other components include minerals, proteins, acids and undetermined matter.
Minerals constitute 3.68%, increase the value of honey for human consumption and the most common minerals are potassium, chlorine, sulfur, calcium, sodium, phosphorus, magnesium, silicon, iron, manganese and copper.
Proteins are collected from nectar and pollen which is the integral parts of plants, acids are also the component, vitamn C and some B complex vitamins such as riboflavin, pantothenic acid, pyridoxine, biotin, nicotinic acid are present.
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Which of these is an example of how engineers have contributed to society?
A. Our current understanding of viruses
B. The theoretical mathematics describing the orbits of planets
around the sun
C. The seven-mile bridge that spans across the Gulf of Mexico to
connect two cities of the Florida Keys
D. Nomadic tribes traveling in search of food to hunt and gather
A certain polyatomic ion contains 49 protons and 50 electrons. What's the net charge of this ion?
A. +1
B.-2
C. +2
D. -1
Answer:
The charge - 1
Because the charge of proton is + and electron -
Charge = +49 +(-50)
= - 1
Explanation:
For the reaction 2HNO3 + Mg(OH)2 + Mg(NO3)2 + 2H20, how many grams of magnesium
nitrate are produced from 17.37 mol of nitric acid, HNO3?
Select one:
O a. 1290
Ob. 859
O c. 5160
Od. 1080
Answer:
mass = (a) 1290
Explanation:
as 2 moles of nitric acid gives one mole of of magnesium nitrate . we should divide the number of moles of of nitric acid by 2 .
Then apply the formula:
number of moles= mass/molar ratio
thanks
The table below gives the numbers of protons, electrons, and neutrons in four atoms.
Atom
11
2
Number of protons
39
40
|39
40
Number of electrons
39
40
39
40
Number of neutrons
52
50
154
51
3
14
Based on the information that is given, which atom in the table has the highest mass?
O 1
2
3
Answer:
The atom with the highest mass with 139 protons and 154 neutrons, is atom 3
Explanation:
The information given are;
The number of protons, p, the number of electrons, e, and the number of neutrons, n, we have;
p, e, n,
39, 39, 52
40, 40 50
139, 39 154
40, 39 51
Based on the information that the mass of the proton = 1.67262 × 10⁻²⁷ kg
The mass of the electron = 1.094 × 10⁻³¹ kg
the mass of the neutron = 1.674927471 × 10⁻²⁷ kg
We have that the atom with the most number of neutron and proton which is atom 3, has the highest mass
we have
what is the the chemical name for hydroden and oxygen
Answer:
hydrogen peroxide is a chemical name for hydrogen and oxygen
Which is the proper order for using a fire extinguisher? pull, aim, squeeze, sweep sweep, squeeze, aim, pull aim, pull, sweep, squeeze pull, sweep, aim, squeeze
Answer:
P.A.S.S
pull, aim, squeeze, sweep.
hope this answer correct (^^)..
Answer:
The proper way of using an extinguisher is:
pull, aim, squeeze and sweep.
Explanation:
P-pull
A-aim
S-squeeze
S-sweep
You can always use this to remember, okay.
Hope it helps.
explain why the windows at the front of airlines ar3 much bigger
Answer:
La mea vola weon
Explanation: Tu mai es zoerrra
Which of the following compounds would be named with a name that ends in -ene?
A. CH3-C triple bond C-CH2-CH2-CH3
B. CH3-CH2-CH2-CH3
C. CH triple bond C-CH2-CH2-CH3
D. CH3-CH2-CH2-CH double bond CH2
Answer:
The answer is option D.
CH3-CH2-CH2-CH=CH2
it's name is Pentene and it's an alkene
Hope this helps you
Why do we use moles when calculating empirical chemical formulas, but not the mass?
Answer:
because moles is the chemical unit*Avogadro's number, meaning it's the amount of atoms in the given unit.
Explanation:
Tartaric acid, C4H6O6, has the first ionization constant with the value: Ka1 = 9.20 × 10-4. Calculate the value of pKb for the conjugate base of tartaric acid. 10.963 3.036 1.087 x 10-11 9.20 x 10-4
Answer:
pKb = 10.96
Explanation:
Tartaric acid is a dyprotic acid. It reacts to water like this:
H₂Tart + H₂O ⇄ H₃O⁺ + HTart⁻ Ka1
HTart⁻ + H₂O ⇄ H₃O⁺ + Tart⁻² Ka2
When we anaylse the base, we have
Tart⁻² + H₂O ⇄ OH⁻ + HTart⁻ Kb1
HTart⁻ + H₂O ⇄ OH⁻ + H₂Tart Kb2
Remember that Ka1 . Kb2 = Kw, plus pKa1 + pKb2 = 14
Kb2 = Kw / Ka1 → 1×10⁻¹⁴ / 9.20×10⁻⁴ = 1.08×10⁻¹¹
so pKb = - log Kb2 → - log 1.08×10⁻¹¹ = 10.96
Which statement best describes how energy is important to chemistry?
A. Energy is stored in an atom's electrons.
B. Energy is not conserved during chemical reactions,
C. Energy is absorbed and released during chemical reactions,
D. Energy holds atoms and bonds together,
Answer:
C. Energy is absorbed and released during chemical reactions,
Explanation:
All chemical reactions involve energy. Energy is used to break bonds in reactants, and energy is released when new bonds form in products. Endothermic reactions absorb energy, and exothermic reactions release energy.
Which energy profile best shows that the enthalpy of formation of CS2 is 89.4 KJ/mol?
Answer:
Option C. Energy Profile D
Explanation:
Data obtained from the question include:
Enthalpy change ΔH = 89.4 KJ/mol.
Enthalpy change (ΔH) is simply defined as the difference between the heat of product (Hp) and the heat of reactant (Hr). Mathematically, it is expressed as:
Enthalpy change (ΔH) = Heat of product (Hp) – Heat of reactant (Hr)
ΔH = Hp – Hr
Note: If the enthalpy change (ΔH) is positive, it means that the product has a higher heat content than the reactant.
If the enthalpy change (ΔH) is negative, it means that the reactant has a higher heat content than the product.
Now, considering the question given, the enthalpy change (ΔH) is 89.4 KJ/mol and it is a positive number indicating that the heat content of the product is higher than the heat content of the reactant.
Therefore, Energy Profile D satisfy the enthalpy change (ΔH) for the formation of CS2 as it indicates that the heat content of product is higher than the heat content of the reactant.
n a covalent bond: A. Both atoms share their electrons. B. One atom accepts electrons from another. C. The atoms attract each other but their electrons do not interact. D. None of these.
Answer:
Hey there!
In a covalent bond, both atoms share their electrons.
Hope this helps :)
The correct statement is that in a covalent bond, both atoms share their electrons. The correct answer is A. Both atoms share their electrons.
In a covalent bond, both atoms share their electrons to achieve a more stable electron configuration. Covalent bonds occur between nonmetal atoms, and they involve the sharing of electron pairs between the participating atoms. This sharing allows both atoms to achieve a more complete octet (or duet for hydrogen) in their outermost energy level.
Unlike ionic bonds, where one atom transfers electrons to another, covalent bonds involve a mutual sharing of electrons. This sharing can be equal (nonpolar covalent) or unequal (polar covalent) depending on the electronegativity difference between the atoms involved.
Option B, "One atom accepts electrons from another," is not characteristic of a covalent bond. That description aligns more with an ionic bond, where one atom donates electrons to another, resulting in the formation of charged ions.
Option C, "The atoms attract each other but their electrons do not interact," does not accurately describe a covalent bond. In a covalent bond, the sharing of electrons is the basis of the interaction between atoms, and the electrons of both atoms do interact and participate in the bond formation.
Therefore, the correct statement is that in a covalent bond, both atoms share their electrons.
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The diagrams show the partides of a substance
Which statement best describes the process that the diagrams show?
O A solid loses fonetic energy to become a loud and then becomes a gas
O A solid sains kinetic energy to become a loud and then becomes a gas
O Asas loses tonerc energy to become a loud and then becomes a solid
O A gas as kinetic energy to become a loud and then becomes a solid
Answer:
B. A solid gains kinetic energy to become a liquid and then becomes a gas.
What kind of matter is smoke? A. solution B. suspension C. colloid D. compound E. molecule
Answer:
C. colloid
Explanation:
Smoke is a collection of tiny solid, liquid and gas particles. Although smoke can contain hundreds of different chemicals and fumes, visible smoke is mostly carbon (soot), tar, oils and ash. Smoke is a collection of tiny solid, liquid and gas particles.
Answer:
C. Colloid
Explanation:
Edmentum/Plato (just took the test its 100% correct)
Help PLZ!!! Which statement accurately represents the arrangement of electrons in Bohr’s atomic model? -Electrons move around the nucleus in fixed orbits of equal levels of energy. -Electrons move around the nucleus in fixed orbits of increasing levels of energy. -Electrons move randomly in the relatively large space surrounding the nucleus. -Electrons vibrate in fixed locations around the nucleus.
Answer:
electrons move around the nucleus in fixed orbits of equal amounts of energy
Explanation:
To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. The correct option is option B.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.
According to Bohr’s atomic model, electrons move around the nucleus in fixed orbits of increasing levels of energy.
Therefore, the correct option is option B that is electrons move around the nucleus in fixed orbits of increasing levels of energy.
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Needed to make one s'more: 2 graham crackers, 3 squares of milk chocolate, and 2 marshmallows.
Maddie and her friends are making s'mores over the campfire. they have a bag of 48 marshmallows, 2 packs of graham crackers containing 16 grahams per pack, and 5 chocolate bars that can each be broken into 15 pieces. if maddie's group wants to make s' mores for all, how many can they make and what is the limiting reactant?
Answer:
15
Explanation:
Determine which reaction has the highest activation energy
Answer:
we need to look at what actually happens to reactant molecules during a chemical. in order for the reaction to take place , some or all of the chemical bonds in the reactants must be broken so that the new bonds, those of the products , can form.
Answer:
Graph 3
Explanation:
got it right.
The analogy that forms the basis of the octet rule compares covalent valence
electron arrangements to:
a. sigma and pi bonds.
b. orbital overlap electron densities.
c. noble gas electron configurations.
d. the hydrogen molecule.
The analogy that forms the basis of the octet rule compares covalent valence electron arrangements to orbital overlap electron densities.
What is orbital ?An atomic orbital is a function that describes the position and wave-like activity of an electron in an atom in terms of both atomic theory and quantum mechanics.
This function may be used to determine the likelihood of discovering any atom's electron in any certain area surrounding the nucleus.
The nucleus is the center of the orbits. One orbital will be larger than the others if an atom has several orbitals, or they will overlap. Additionally, an electron is most likely to be found in the orbitals.
An atomic Orbitals are centred around the nucleus. If an atom has many orbitals, either one orbital is bigger than the others or they overlap.
Thus, option B is correct.
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Question 9 of 50
2 Point
When hydrogen is burned in the presence of oxygen it will form water, as
per the equation: 2H2 + O2 -> 2H20. Which types of reactions does this
fall under?
I. synthesis
II. decomposition
III. single replacement
IV. double replacement
V. combustion
O A. I and V
Answer:
V. Combustion
Explanation:
Combustion is a reaction where a substance is burned - in this case, hydrogen is burned.
Which of the following best describes the transfer of fecal coliform and an impact on the environment?
Fecal coliform increases the growth of algae in surface water bodies, killing fish.
Digestive problems in humans are elevated from the increase of fecal coliform into drinking water.
Fecal coliform decreases the amount of dissolved oxygen and an overpopulation of fish in surface water bodies occurs.
Fecal coliform increases the amount of organic substances in water and lowers the amount of dissolved oxygen, killing fish.
Answer:
Fecal coliform increases the amount of organic substances in water and lowers the amount of dissolved oxygen, killing fish.
Explanation:
Fecal coliform are species of bacteria that are found in the intestine of warm-blooded animals like humans etc. Hence, they are released whenever they excrete feaces. Due to this reason, the presence of fecal coliform bacteria in a water body indicates fecal discharge into that water.
The presence of excessive fecal coliform in a water body increases the amount of organic substances in the water. These organic substances are decomposed by bacteria, which causes the oxygen present in the water body (dissolved oxygen) to deplete/decrease. The depletion of oxygen in the water threatens aerobic aquatic organisms e.g fishes and they ultimately suffocate and die.
Question 22
3 pts
To what volume will a 2.33 L sample of gas expand if it is heated from 10.0°C to 100.0°C?
0.233L
4.41L
23.3 L
3.76 L
3.07 L
Answer:
3.07L
Explanation:
Charles law, which describes the direct relationship of the absolute temperature to its volume when the pressure is kept constant will be used in this case. The Charles' law equation is:
V1/T1 = V2/T2
Where; V1 is the volume of the gas at an initial state= 2.33L
V2 is the volume of the gas at a final state= ?
T1 is the absolute temperature of the gas at an initial state= 10°C
T2 is the absolute temperature of the gas at a final state= 100°C
The temperature in degree Centigrade (°C) must be converted to the absolute temperature unit (Kelvin) using:
T(K) = T(°C) + 273.15
T1 = 10°C + 273.15 = 283.15K
T2 = 100°C + 273.15 = 373.15K
To solve for V2 in the above Charles law equation, we make V2 the subject of the formula by saying:
V2 = V1 × T2 / T1
V2 = 2.33 × 373.15 / 283.15
V2 = 869.4395/ 283.15
V2 = 3.0705
Hence, the gas will be expanded to a volume of 3.07L when heated from 10.0°C to 100.0°C.