Answer:
C. Decreasing the temperature of the system.
Explanation:
Decreasing the temperature of the system increases the chance of a reaction when two molecules collide.
The chance of a reaction when two molecules collide is increased by 'Increasing the concentration of the molecules', while the other options listed ('increasing the activation energy of the reaction', 'decreasing the temperature of the system', 'slowing down the speed of the molecules') actually decrease the chance of a reaction.
Explanation:The chance of a reaction when two molecules collide can be increased via one or more of several methods, each corresponding to different options presented in your question. Option A. Increasing the concentration of the molecules, leads to more frequent collisions and thus a higher chance of reaction. Option B. Increasing the activation energy of the reaction, instead, makes reactions less likely because more energy is needed for the reaction to occur. Option C. Decreasing the temperature of the system also reduces the chance of reaction as it slows down molecular motion and thus collisions. Option D. Slowing down the speed of the molecules also decreases the chance of reactions as it reduces the frequency of collisions. Based on these considerations, only Option A. Increasing the concentration of the molecules increases the chance of a reaction when two molecules collide.
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Mixtures are classified as homogeneous and heterogeneous according to ___.
the distribution of their components
whether their components are elements or compounds
the masses of their components
the states of matter of ther components
Answer:
whether their componets are made of elements or compounds
Explanation:
remeber homo means same and hetero mean different.
knowing this you also know that elements would be homogeneous and compounds would be heterogeneous since compunds are made of two or more things
Answer: Option (a) is the correct answer.
Explanation:
A mixture is defined as the substance that contains two or more different number of substances that are physically mixed together.
For example, a mixture of iron nails, sand and water.
A mixture in which solute particles are unevenly distributed into the solvent then it is known as a heterogeneous mixture.
For example, sand in water is a heterogeneous mixture.
A homogeneous mixture is defined as the mixture in which solute particles are evenly distributed in a solvent.
A homogeneous mixture is a clear solution.
For example, salt dissolved in water is a homogeneous mixture.
Thus, we can conclude that mixtures are classified as homogeneous and heterogeneous according to the distribution of their components.
Which isotope completes this nuclear reaction?
Answer:
¹³₆C
Explanation:
The given nuclear reaction is:
¹⁰₅B + ₂⁴He → ᵃₙX + ₁¹H
In balancing nuclear reaction equation, the mass number which are the superscript and atomic number, the subscript on both sides of the equation must be the same.
For the mass number:
10 + 4 = a + 1
14 = a + 1
a = 13
For the atomic number:
5 + 2 = n + 1
7 = n + 1
n = 6
Note: n is the same as z from the equation
therefore our atom is ¹³₆X which is an isotope of carbon, ¹³₆C
PLEASE ANSWER FIRST GETS BRAINLIEST
1. H2O molecules ____________when temperatures drop below freezing.
A. Bond
B. Form crystals
C. Create solids
D. All of the above
2. When the ice forms, the hydrogen atoms in a water molecule
A. Bond with hydrogen atoms in other water molecules
B. Bond together and release the oxygen atom into the air
C. Bond with the oxygen atoms in other water molecules
D. Combine to form a single, heavier hydrogen atom
3. Why is ice less fence than liquid water?
Answer:
1 is B
Explanation:
Ice is crystalline so when water drops below freezing it forms crystals, I don't know the rest.
Answer:
1. D
2. C
3. Ice is less dense than water because the orientation of hydrogen bonds causes molecules to push farther apart, which lowers the density. More organized in the solid forms verse the liquid form.
Explanation:
1. When temperatures drop below freezing crystals are formed, and crystals = ice. Ice = solid and there are more bonds in ice than there are in water.
2. When ice forms the hydrogen atoms in a water molecule bond with the oxygen atoms in other water molecules.
Describe the main difference between the Bohr model of the atom and the Rutherford model.
Answer:
The main difference between the two models was about the location of the electron in an atom.
Explanation:
Rutherford described that:
The electrons were outside of the nucleus.They were equal in number to the "positiveness" of the nucleus.Also, He randomly placed the negative electrons outside the nucleus.Bohr improved the Rutherford model:
Bohr placed the electrons in distinct energy levels.Electrons only exist in fixed orbitals (shells) and not anywhere in between.Each shell has a fixed energyRutherford explained the nucleus of an atom, while Bohr was more into the electrons and their energy levels.Exact Answer:
In the Rutherford model, electrons can exist in any location outside the nucleus.
In the Bohr model, electrons can exist only in certain energy levels surrounding the atom.
Two students made the Lewis dot diagrams of NH3. The diagrams are as shown.
Which student drew the correct Lewis dot diagram?
Only Student A
Only Student B
Both Student A and Student B
Neither Student A nor Student B
Answer : The correct option is, Only Student B
Explanation :
Lewis-dot structure : It shows the bonding between the atoms of a molecule and it also shows the unpaired electrons present in the molecule.
In the Lewis-dot structure the valance electrons are shown by 'dot'.
The given molecule is, [tex]NH_3[/tex]
As we know that nitrogen has '5' valence electrons and hydrogen has '1' valence electron.
Therefore, the total number of valence electrons in [tex]NH_3[/tex] = 5 + 3(1) = 8
According to Lewis-dot structure, there are 6 number of bonding electrons and 2 number of non-bonding electrons.
The Lewis dot structure of student A is wrong because there is a coordinate bond present between the nitrogen and hydrogen is not covalent.
The correct Lewis-dot structure of [tex]NH_3[/tex] is shown by the student B.
Answer:
niether of them
Explanation:
the rest are bs
Which nonmetal is likely to be least reactive
A) OXYGEN
B) SULFUR
C) CHLORINE
D) FLUORINE
All atoms of isotopes of a particular element have the same number of protons, but different numbers of neutrons in their nuclei.
True
False
Answer:
All atoms of isotopes of a particular element have the same number of protons, but different numbers of neutrons in their nuclei.- True
Answer: True
Explanation:
All isotopes have equal number of protons but differ by number of neutrons in the nucleus. The number of neutrons changes the weight of the elements, but not the atomic number since that is a function of protons. Most isotopes are radioactive and are not stable. Eg C has two isotopes ¹²C and ¹³C, they only varies by number of neutrons and still have the same type of chemical reactivity. But ¹²C is found in nature while ¹³C is radioactive and used in carbon dating.
Hydrogen gas is filled in a 224 ml glass container at 0 degree celcius and 1 atmospheric pressure. What are the number of molecule of hydrogen in the container??
Answer:
[tex]\boxed{\text{6.02 $\math{\times 10^{21}}$ molecules}}[/tex]
Explanation:
A pressure of 1 atm and a temperature of 0 °C is the old definition of STP. Under these conditions, 1 mol of a gas occupies 22.4 L.
1. Calculate the moles of hydrogen.
[tex]n = \text{0.224 L} \times \dfrac{\text{1 mol}}{\text{22.4 L}} = \text{0.0100 mol}[/tex]
2. Calculate the number of molecules
[tex]\text{No. of molecules} = \text{0.0100 mol} \times \dfrac{\text{6.022 $\times 10^{23}$ molecules}}{\text{1 mol}}\\\\= \textbf{6.02 $\mathbf{\times 10^{21}}$ molecules}\\\\\text{The sample contains }\boxed{\textbf{6.02 $\mathbf{\times 10^{21}}$ molecules}}[/tex]
Answer: 6.02 × [tex]10^{21}[/tex] molecules of hydrogen are in the container. The Ideal Gas Law equation gives the relationship among the pressure, volume, temperature, and moles of gas. Once the moles of gas is determined, we use Avogadro's number, 6.022 × [tex]10^{23}[/tex] to get he number of molecules.
Further Explanation:
The Ideal Gas Equation is:
[tex]PV = nRT[/tex]
where:
P - pressure (in atm)
V - volume (in L)
n - amount of gas (in moles)
R - universal gas constant [tex]0.08206 \frac{L-atm}{mol-K}[/tex]
T - temperature (in K)
In the problem, we are given the values:
P = 1 atm
V = 224 mL = 0.224 L (3 significant figures)
n = ?
T = 0 degrees Celsius
We need to convert the temperature to Kelvin before we can use the Ideal Gas Equation. The formula to convert from degree Celsius to Kelvin is:
[tex]Temperature \ in \ Kelvin = Temperature\ in \ Celsius \ + \ 273.15[/tex]
Therefore, for this problem,
[tex]Temperature\ in \ K = 0 +273.15\\Temperature\ in \ K = 273.15[/tex]
Solving for n using the Ideal Gas Equation:
[tex]n \ = \frac{PV}{RT}\\n \ = \frac{(1 \ atm) \ (0.224 \ L)}{(0.08206 \ \frac{L-atm}{mol-K})( 273.15 \ K)} \\ n \ = 9.99\ X \ 10^{-3} mol[/tex]
Now that we know the number of moles of hydrogen gas, we can determine how many molecules there are:
[tex]no.\ of \ molecules \ = moles \ of \ hydrogen \ (\frac{6.022 \ X \ 10^{23} molecules}{1 \ mole\ of \ hydrogen} )\\no.\ of \ molecules \ = 9.99 \ X \ 10^{-3} \ moles \ (\frac{6.022 \ X \ 10^{23} molecules}{1 \ mole\ of \ hydrogen} )\\ no. \ of \ molecules \ = 6.02 \ X 10^{21} \ molecules \ of \ hydrogen[/tex]
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Keywords: Ideal Gas Law, Volume, Pressure
a reaction in which the rate depends linearly only on one reactant concentration is called
Answer:
That's called a first-order reaction.
Explanation:
In kinematics, the order of a chemical reaction is the sum of the power of concentrations in is rate law.
For example, consider a reaction with the following rate law:
[tex]\text{Rate} = k\cdot [\mathrm{A}]^{a}\cdot [\mathrm{B}]^{b}[/tex],
where [tex][\mathrm{A}][/tex] and [tex][\mathrm{B}][/tex] are the concentrations of the two reactants, [tex]\mathrm{A}[/tex] and [tex]\mathrm{B}[/tex].
The order of this reaction will be equal to the sum of the powers of the concentrations in the rate law. For this sample reaction, the order is equal to [tex]a + b[/tex].
For the reaction in this question, the rate law will resemble the following:
[tex]\text{Rate} = k\cdot [\mathrm{A}][/tex].
Note that the power "[tex]1[/tex]" next to the concentration of [tex]\mathrm{A}[/tex] is omitted. The order of this reaction will be numerically equal to one.
However, by convention, the order of the reaction is named in ordinals. (That is: first, second, third, etc.) The reaction here is known as a first-order reaction.
(Reference: "The Rate Law", Physical & Theoretical Chemistry, Chemistry Libretexts; "Cardinal and Ordinal Numbers Chart", Math Is Fun)
2. Which of the following is unique for any given element?
A its mass number
B the number of its neutrons
C its atomic number
Answer:
C its atomic number
Explanation:
Every element has a unique atomic number. The atomic number is always the same for a given element and does not change.
The number of protons in an atom is the atomic number. Protons are located in the nucleus. Being nuclei particles, they do not have a variable number. Their number is fixed and we can easily identify an atom with the number of protons, which is the atomic number.
Boron has an average mass of 10.81. One isotope of boron has a mass of 10.012938 and a relative abundance of 19.80 percent. The other isotope has a relative abundance of 80.20 percent. What is the mass of the two isotopes?
The average mass of an atom is calculated with the formula:
average mass = abundance of isotope (1) × mass of isotope (1) + abundance of isotope (2) × mass of isotope (2) + ... an so on
For the boron we have two isotopes, so the formula will become:
average mass of boron = abundance of isotope (1) × mass of isotope (1) + abundance of isotope (2) × mass of isotope (2)
We plug in the values:
10.81 = 0.1980 × 10.012938 + 0.8020 × mass of isotope (2)
10.81 = 1.98 + 0.8020 × mass of isotope (2)
10.81 - 1.98 = 0.8020 × mass of isotope (2)
8.83 = 0.8020 × mass of isotope (2)
mass of isotope (2) = 8.83 / 0.8020
mass of isotope (2) = 11.009975
mass of isotope (1) = 10.012938 (given by the question)
Which statement best compares frogs and toads with salamanders?
Frogs and toads lose their tails as they develop into adults, but salamanders keep their tails.
Salamanders have lungs from the time they hatch, but frogs and toads have gills when they first hatch.
Frog and toad eggs are covered in a soft, jellylike substance, but salamander eggs are covered in a hard shell.
Salamander offspring are born with long legs that eventually shorten, but frogs and toads are born without legs.
Answer:
Frogs and toads lose their tails as they develop into adults, but salamanders keep their tails
Explanation:
The salamanders, frogs, and toads are part of the amphibian family. They all live in both water and land. The water is still crucial for their live, despite them being relatively well developed for terrestrial live, with the biggest importance being that their offspring needs it in order to develop. The salamander offspring has only front limbs and tail, thus it can not live on land until it is fully developed, while the frog and toad offspring doesn't have any limbs at the start, only tail, thus not being able to even come out of the water. As they mature, the salamander offspring develops hind limbs as well, while retaining the tail. The frog and toad offspring develops front and back limbs, but its loses its tail.
Answer:
A) Frogs and toads lose their tails as they develop into adults, but salamanders keep their tails
Explanation:
3. Which is true about the combustion of carbon?
O Carbon is produced from oxygen and carbon dioxide.
The reaction is spontaneous.
O Enthalpy remains constant.
Entropy decreases.
The combustion of carbon is a spontaneous process where carbon reacts with oxygen to form carbon dioxide. During this process, the enthalpy of the system decreases and the entropy increases.
Explanation:The combustion of carbon, a chemical reaction involving carbon and oxygen, primarily results in the formation of carbon dioxide. This process is spontaneous under standard conditions, which means that it occurs naturally without needing any additional input. However, the statement that carbon is produced from oxygen and carbon dioxide is incorrect; rather, carbon and oxygen react to form carbon dioxide in a combustion reaction.
From the thermodynamic perspective, the enthalpy of the system decreases as heat is released during the combustion, so it's not true that enthalpy remains constant. This is an exothermic reaction, which involved a negative change in enthalpy. The entropy, or the degree of randomness or disorder, increases due to the production of gas molecules from a single carbon atom and oxygen molecule, contrary to the claim that the entropy decreases.
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When liquid water is heated, it will eventually change to a gas through ................ . Gas particles move................ (faster, slower. or at the same same rate) and have..............( stronger, weeker, more magnetic) attractions between particles than liquid particles.
Answer:
evaporation
faster
weeker
Liquid water changes to a gas through boiling; gas particles move faster and have weaker attractions than in the liquid state. This is due to higher kinetic energy overcoming hydrogen bond attractions. Water's unique properties, including ice being less dense than liquid water, are a result of hydrogen bonding.
Explanation:When liquid water is heated, it will eventually change to a gas through boiling. Gas particles move faster and have weaker attractions between particles than liquid particles. The transition from the liquid phase to the gas phase happens at a substance's boiling point, which is a physical property of the liquid. The process whereby water transforms into gas is closely linked to the kinetic energy of its molecules and the breaking of hydrogen bonds. As water reaches its boiling point and is further heated, the water molecules gain enough energy to break free from the attraction that holds them together in the liquid state, allowing them to escape and spread out as a gas.
The unique properties of water, including its ability to exist as a gas, liquid, and solid, stem from its capacity to form hydrogen bonds. These bonds cause water to behave differently than other substances. For example, unlike most substances, ice (solid water) is less dense than liquid water because the hydrogen bonds cause the molecules to be structured in a way that takes up more space.
Which of the following would decrease the pH level of an acidic solution? (2 points) adding a base to the acid increasing the concentration of hydroxide ions decrease the concentration of hydronium ions increasing the number of hydrogen ions
Answer:
increasing the number of hydrogen ions.
Explanation:
pH is a measure of the acidity or alkalinity of a solution.pH = -log[H⁺].
The presence of H⁺ is the responsible of the acidity of the solution.As the concentration of H⁺ increases, the acidity of the solution increases and so, pH decreases.So, the right choice is: increasing the number of hydrogen ions.A spoon of salt is added to water. Which of these will increase how fast the salt dissolves? Check all of
the boxes that apply.
adding another spoon of salt
stirring the salt and water
cooling the water
crushing the salt so the grains are smaller
adding more water
Answer:
Stirring the salt and water
Crushing the salt so the grains are smaller
Explanation:
Another way that is not in the choices that would increase the rate of dissolving of a solute in the solvent is heating the solvent. This increases the kinetic energy of the particles hence increasing collision rates. This helps increase the dissolution of the solute.
Stirring helps break down the solute to smaller particles. Smaller particles have a larger surface area to volume ration on which collision with solvent molecule can occur hence faster dissolution.
how many atoms are in lead ii bicarbonate
Answer:
11 atoms
Explanation:
The formula for lead(II) bicarbonate is: Pb(HCO3)2.
Atoms in Pb(HCO3)2:
Pb=1, H=1×2, C=1×2, O=3×2
1+1×2+1×2+3×2
=1+2+2+6
=11 atoms
A molecule of Lead (II) bicarbonate, which is a binary compound, consists of 11 atoms in total: 1 lead atom, 2 hydrogen atoms, 2 carbon atoms, and 6 oxygen atoms.
Explanation:The formula for lead (II) bicarbonate is Pb(HCO₃)₂. This indicates there is 1 atom of lead (Pb), 2 atoms of hydrogen (H), 2 atoms of carbon (C), and 6 atoms of oxygen (O). So, in total, there are 11 atoms in a molecule of lead (II) bicarbonate. This is a binary compound, an example of the broader category known as binary compounds, which are compounds composed of two elements.
In terms of the bicarbonate anion, it consists of 1 carbon atom, 1 hydrogen atom, and 3 oxygen atoms. It is a polyatomic ion that frequently combines with metal ions, forming a variety of essential compounds.
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4. You have a very concentrated solution (12 M) of potassium chloride (KCI). You need it to be at the least concentration possible for the experiment you are
about to conduct. The problem is you forgot to order lab supplies, so you only have 2 L of distilled water left. What would be the final concentration if you
added the two 2 L of distilled water to the 0.5 L of 12 M KCI?
a 3.0 M
b 24 M
C 2.4M
d 48 M
Answer:
C. 2.4 M
Explanation:
Because you started with 12M solution of KCl, that means that there was a concentration of 12 mols of KCl per Liter of solution. (12mol/1L =12 M). Since there was only 0.5L of solution, there was only 6 mols of KCl because there is only 12 mols per 1 Liter, so half of that volume would have half the amount of solute to keep that true. (6mol/.5L = 12 M). With the new water added, the formula becomes (6mols KCl/ 2.5L of water =2.4 M)
After diluting 0.5 L of a 12 M potassium chloride (KCl) solution with 2 L of distilled water, the final concentration will be 2.4 M.So,option C is correct.
The final concentration of potassium chloride (KCl) after dilution, we can use the formula M1V1 = M2V2, where M1 is the initial molarity, V1 is the initial volume, M2 is the final molarity, and V2 is the final volume.
Starting with 0.5 L of a 12 M KCl solution and adding 2 L of distilled water, the final volume (V2) is 0.5 L + 2 L = 2.5 L.
Using the formula, we get:
12 M times 0.5 L = M2 times 2.5 L
So, the final concentration (M2) is:
M2 = (12 M times 0.5 L) / 2.5 L = 2.4 M
Therefore, the final concentration of the KCl solution would be 2.4 M.
Solid carbon (C) can burn in oxygen (O2). Select
the answer that completes this chemical equation
correctly.
C + O2 →?
O coz
O C + 20
Answer:
CO₂Explanation:
The equation that you have to complete is:
C + O₂ → ?This is, you have to find the products formed and the coefficients in front of each substance to balance the chemical equation.
Carbon may react with oxygen using oxidation number 2 or 4.
If carbon uses oxidation number 2, the chemical equation is:
2C + O₂ → 2COIf carbon uses oxidation number 4, the chemical equation is:
C + O₂ → CO₂Normally, an incomplete combustion yields to a mixture of products: both CO and CO₂, and it only happens when the amount of oxygen is limitied.
When there is plenty of oxygen available, the combustion is complete and the only product of the reaction is CO₂.
With that information, and the fact that the list of choices do not include CO as product, you conclude that this is a complete combustion, and the chemical equation is:
C + O₂ → CO₂So, the choice that completes the chemical equation is CO₂.
Why are dark matter and dark energy described as "dark"? A. Because they emit blackbody radiation. B. Because they absorb light. C. Because they are only found in shadows. D. Because we cannot easily detect them.
HELP ME PLZ!!
Final answer:
Dark matter and dark energy are termed 'dark' because they do not emit, absorb, or reflect light, which makes them invisible to traditional detection methods such as telescopes; they are detectable only through their gravitational effects.
Explanation:
Dark matter and dark energy are described as "dark" not because they emit blackbody radiation, absorb light, or are merely found in shadows, but because they are difficult to detect by conventional means. The correct answer is D. Because we cannot easily detect them. Dark matter does not emit, absorb, or reflect any light, making it invisible to traditional telescopes that detect electromagnetic radiation. Astronomers infer its existence through the gravitational effects it has on visible objects, such as the rotation curves of galaxies and the gravitational lensing of light from distant objects.
The term "dark" in dark matter and dark energy refers to the fact that these components do not interact with electromagnetic radiation in a way that allows us to detect them directly. Dark matter makes up approximately 80% of the matter in the Universe, and its presence is known primarily through its gravitational influence. Similarly, dark energy is hypothesized to be responsible for the observed acceleration of the expansion of the Universe. However, its nature remains a profound mystery in physics.
Using the periodic table, answer the following question..How many atoms of neon are in 0.378g of neon (a) 6.02 x 10²³ atoms (b) 1.87 x 10‐²atoms (c) 2.28 x 10²³ atoms (d)1.13 x 10²² atoms.
The correct answer is D. 1.13 x 10^22 atoms are present in 0.378 g of neon. Avogadro's number (6.022 x 10^23) gives the ratio of representative particles per mole of substance. For every mole of substance, there are 6.022 x 10^23 representative particles present. Since 0.378 g of neon is less than one mole of neon, the answer should be less than Avogadro's number, which makes option D a logical answer.
Further Explanation:
To get the number of atoms present in 0.378 g of neon the following steps must be done:
Convert the mass of neon into moles.Use Avogadro's number to get the number of atoms present in the given moles of neon.STEP 1: Convert 0.378 g of Neon to moles of Neon
[tex]moles \ of \ neon \ = 0.378 \ g \ Ne (\frac{1 \ mol \ Ne}{20.1797 \ g \ Ne})\\\\\boxed {moles \ of \ Ne \ = 0.018732 \ mol}[/tex]
STEP 2: Use Avogadro's number to calculate the number of atoms of Ne
[tex]no. \ of \ atoms \ Ne \ = 0.018732 \ mol \ Ne \ (\frac{6.022 \ x \ 10^{23} \ Ne \ atoms}{1 \ mol \ Ne})\\\\ no. \ of \ atoms \ Ne \ = 1.128 \ x \ 10^{22} \ atoms[/tex]
Since the given, 0.378 g has 3 significant figures, the final answer must also have 3 significant figures. Therefore,
[tex]\boxed {no. \ of \ atoms \ Ne \ = 1.13 \ x \ 10^{22} \ atoms}[/tex]
A. 6.02 x 10^23 atoms is FALSE because the given amount of neon is less than one mole. Hence, the number of atoms cannot be equal to Avogadro's number.
B. 1.187 x 10^-2 atoms is FALSE because atoms are very very small particles. It will require a large number of atoms to make up something that is measurable like a 0.378 g sample of neon. Having less than 1 atom to make up this much sample is not logical.
C. 2.28 x 10^23 atoms is FALSE because this much atoms make up 0.3781 mol of Neon but the given is 0.378 grams not moles of Ne.
D. 1.13 x 10^22 atoms is TRUE because the value is less than 6.022 x 10^23 which is logical since the sample is less than 1 mole.
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Final answer:
To find the number of atoms of neon in 0.378g, we divide the mass by the atomic mass of neon to find the number of moles, then multiply by Avogadro's number. The result is approximately 1.13 × 10²² atoms. So the correct answer is option d.
Explanation:
To determine how many atoms of neon are in 0.378g of neon, first, we need to use Avogadro's number, which is 6.022 × 10²³ atoms per mole. This number helps us to convert between the number of atoms and the number of moles. Neon has an atomic mass of approximately 20.18 g/mol. Therefore, we can calculate the number of moles of neon in 0.378g by using the formula:
moles of Neon = mass (g) / atomic mass (g/mol)
moles of Neon = 0.378g / 20.18g/mol
moles of Neon = 0.0187286 mol
Now, we convert this number into atoms using Avogadro's number:
number of atoms = moles of Neon × Avogadro's number
number of atoms = 0.0187286 mol × 6.022 × 10²³ atoms/mol
number of atoms ≈ 1.13 × 10²² atoms
So the answer is (d) 1.13 × 10²² atoms of neon in 0.378g of neon.
The overall change in enthalpy of a reaction depends only on the reactants and the products. the path that is taken from the reactants to the products. the reactants and the catalysts only. the reactants, the products, and the catalysts.
Answer:
Here is the complete statement: The overall change in enthalpy of a reaction depend ONLY ON REACTANTS AND THE PRODUCTS.
Explanation:
Change in enthalpy of a chemical reaction refers to the heat change that is associated with a chemical change when the pressure is held constant. Generally, chemical reaction involves the breaking of chemical bonds in the reactants and the formation of new chemical bonds in the products. The breaking and forming of bonds involve heat change; the amount of heat that is given off and absorb in each chemical reaction depend on the type of reactants and products that are involved in the chemical reaction.
Answer:
A
Explanation:
What is the mist likely effect to the reaction is there is an increase in pressure on this reaction
Answer:
an increase in pressure will result in a decrease in volume
Explanation:
boy's law
Answer:
B. The reaction rate decreases
Explanation:
Increasing the pressure on a reaction involving reacting gases increases the rate of reaction.
Changing the pressure on a reaction that involves only solids or liquids has no effect on the rate.
If you increase the pressure of a gas, you squeeze it into a smaller volume
Greater density of molecules increases the number of collisions. When you decrease the pressure, molecules don't hit each other as often and the rate of reaction decreases.
What will most likely happen when two bromine atoms bond together?
The atoms will become less stable.
An ionic bond will hold them together.
A covalent bond will hold them together.
A metallic bond will hold them together
Answer:
A covalent bond will hold them together.
Explanation:
The two bromine atoms will share electrons to build a stronger bond and have a full valence outer shell (which makes them stable).
Hope this helps!
Answer:
c
Explanation:
did on edge 2k24
I need this answer ASAP
Bart is a mechanic. Whitch field of science does vary need to know the most about on order to repair cars
Answer:
B: Physical Science
Explanation:
The answer is physical science because you need to know the laws of physics and chemistry to know how a car works. Physical sciences = the sciences concerned with the study of inanimate natural objects, including physics, chemistry, astronomy, and related subjects.
Help!!! Acids and Bases
Answer:
In this theory, an acid is a substance that can release a proton (like in the Arrhenius theory) and a base is a substance that can accept a proton. A basic salt, such as Na+F-, generates OH- ions in water by taking protons from water itself (to make HF)
NO3 + 12 + 103 + NO2
What is being oxidized?
Explanation:
perhaps is NO3
this question is somehow not correct
Answer:
NO₃⁻ is reduced; I₂ is oxidized
Explanation:
I think your equation is supposed to be
NO₃⁻ + I₂ ⟶ IO₃⁻ + NO₂
If you break the equation into two half-reactions, you get
NO₃⁻ + 2H⁺ + e⁻ ⟶ NO₂ + H₂O
I₂ + 3H₂O ⟶ IO₃⁻ + 6H⁺ + 5e⁻
We see that NO₃⁻ gains an electron, so it is reduced.
I₂ loses five electrons, so it is oxidized.
Given SiO2 + 4HF --> SiF4 +2H2O
in this chemical equation how many grams of HF are needed for 182 grams of SiO2 to react completely?
Answer:
=242.47 g of HF
Explanation:
From the equation One mole of SiO₂ (Silicon (IV) Oxide) react with 4 moles of HF (Hydrogen fluoride).
This is because the reaction ratio is 1:4
The number of moles in182 grams of SiO₂ is:
Number of moles= Mass/RMM
RMM of SiO₂ is 60.08 g/mol
No. of moles=182g/60.08g/mol
=3.0293 moles.
The reaction ratio of SiO₂ to HF is 1:4
Thus the number of moles of HF required to react with 3.0293 moles of SiO₂ is:
(4×3.0293)/1= 12.1172 moles
The mass of 12.1172 moles of HF is.
12.1172 moles× RMM of HF
=12.1172 moles×20.01 g/mol
=242.47 g of HF
How many moles is 145 liters of hydrogen gas at STP?
Answer:
6.44 moles
Explanation:
At STP, 1 mole = 22.4 L
145 L × (1 mole ÷22.4 L) = 6.44 moles
How many moles of carbon dioxide are produced when 5.12 mol of propane gas is burned in excess oxygen? C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(l)
Answer:
15.4 mol CO₂
Explanation:
5.12 mol C₃H₈ × (3 mol CO₂ / mol C₃H₈) ≈ 15.4 mol CO₂
Answer:
15.36 moles of carbon dioxide are produced when 5.12 mol of propane gas is burned in excess oxygen
Explanation:
The Balanced Chemical equation is :
[tex]C_3 H_8 (g) + 5O_2 (g) > 3CO_2 (g) + 4H_2 O(l)[/tex]
Mole ratio of [tex]C_3 H_8:CO_2[/tex] is 1 : 3
That is, 1 mole of propane gas produces 3 moles of carbon dioxide gas.
Using mole ratio we can solve this
[tex]5.12mol C_3 H_8 \times \frac {(3mol CO_2)}{(1mol C_3 H_8 )}[/tex]
[tex]=15.36 mol CO_2[/tex] is produced.
(Answer)
Please note :
To convert moles to mass, we multiply by molar mass
To convert mass to moles, we divide by molar mass
Molar mass is the mass of 1 mole of the substance
For example molar mass of [tex]CO_2[/tex] is
[tex](12.0+2\times16)=44 g/mol[/tex]
(we just add the atomic mass of the atoms to get the molar mass of the substance)