Answer:
Acidic.
Explanation:
pH is a logarithmic function of [H+]:
pH = −log[H+]
pH is usually (but not always) between 0 and 14. Knowing the dependence of pH on [H+], we can summarize as follows:
If pH < 7, then the solution is acidic.
If pH = 7, then the solution is neutral.
If pH > 7, then the solution is basic.
Given pH is 6.75 so it is acidic.
1.74 A flask contains a 30.0 mL sample of acetone (nail polish remover) that weighs 23.6 grams.
What is the density of the acetone?
Answer:
ρ = 0.787 g/cm³
Explanation:
1 mL= 1 cm³
30.0 mL= 30 cm³
Density = mass/volume
The mass provided in the question= 23.6 grams
Volume= 30.0 cm³
Thus density= 23.6 grams/ 30.0 cm³
=0.787 g/cm³
If required in kg/ m³ the density will be calculated as follows.
There are 1000 g in 1 kg thus the density =
=0.787 g/cm³ ×1000
=787 kg/m³
How much heat is released when you condense 93.9 g of water vapor?
Show work please ❤️
Answer:
211.9 J
Explanation:
The molecules of water release heat during the transition of water vapor to liquid water, but the temperature of the water does not change with it.
The amount of heat released can be represented by the formula:
[tex]Q=mL_e[/tex]
where [tex]Q[/tex] = heat energy, [tex]m[/tex] = mass of water and [tex]L[/tex] = latent heat of evaporation.
The latent heat of evaporation for water is [tex]L=2257 kJ/kg[/tex] and the mass of the water is [tex]m=93.9 g=0.0939 kg[/tex].
The amount of heat released in this process is:
[tex]Q=mL_e = (0.0939kg)(2257 kJ/kg)=[/tex] 211.9 J
In an exothermic reaction the bonding energy of the product is:
less than the reactants
same as the reactants
greater than the reactants
dependent upon the presence of a catalyst
Answer:
less than the reactants
Explanation:
Since the reaction is exhotermic, meaning that they have already released energy in the bonding, the product is releasing heat energy, and the reactants were not, so the products would have less bonding energy than the reactants.
Vehicle emissions devices incorporate a chemical reaction to help control carbon monoxide pollution: 2CO+ O2->2CO2
What effect does adding a catalyst have for this reaction?
•It produces more carbon monoxide.
•It converts carbon monoxide faster.
•It keeps carbon monoxide from teacting.
•It keeps carbon dioxide from reacting.
It convert carbon monoxide faster
Answer: The correct answer is it converts carbon monoxide faster.
Explanation:
Catalyst is defined as the substance which increases the rate of the reaction without getting actually participated in the reaction. It can be easily regenerated at the end of the reaction.
For the given chemical reaction:
[tex]2CO+O_2\rightarrow 2CO_2[/tex]
Addition of catalyst will lead us to the production of carbon dioxide faster or it may convert carbon monoxide faster into the products.
Hence, the correct answer is it converts carbon monoxide faster.
what are the reactions of electron transport chain and respiratory chain?
Answer:
The electron transport chain consists of a series of redox reaction in the form of complex I, Q, complex II and III.
1- complex I establishes hydrogen gradient across the matrix by transferring two hydrogen ions plus its uses FMH as a cofactor.
2- In Q and complex II series, Q is reduced by NADH into QH2 and this complex receives FADH2 which delivers electrons to ETC.
3- The third complex is composed of cytochrome b and c.It also transfers protons to the fourth complex.
4- The Fourth complex contains cytochrome proteins c, a, and a3. It reduces oxygen which picks up the protons to form water.
Overall series of reactions in ETC:
NADH+H+ → Complex I → Q → Complex III → cytochrome c → Complex IV → H2O
↑
Complex II
↑
Succinate
Respiratory chain:
1- Hydrogen is obtained by the reduction of NADH and from FADH.
2- The electrons are transferred to complexes I, II and III and then to oxygen.
3- After this complexes, I, II and III expel protons across the membrane.
4- These protons are then used to synthesize ATP.
Final answer:
The electron transport chain, also known as the respiratory chain, is a series of oxidation-reduction reactions that transfer electrons from substrates to molecular oxygen. It is located in the inner mitochondrial membrane in eukaryotes and the plasma membrane in prokaryotes. The energy released during the electron transfer is used to pump hydrogen ions across the membrane, creating a proton gradient that drives the synthesis of ATP.
Explanation:
The electron transport chain (ETC) or respiratory chain is a series of oxidation-reduction reactions that transfer electrons from substrates to molecular oxygen. It is located in the inner mitochondrial membrane in eukaryotes and the plasma membrane in prokaryotes. The ETC consists of four protein complexes, labeled I through IV, and associated mobile electron carriers. As electrons are passed through the chain, they lose energy, and this energy is used to pump hydrogen ions across the membrane, creating a proton gradient. The final electron acceptor is molecular oxygen, which is reduced to water. The ATP formed during this process is known as oxidative phosphorylation.
Which are causes of mechanical weathering? Check all that apply.
O
acid rain
O plant growth
O animal actions
O carbon dioxide
O pressure release
Answer: Plant growth, animal actions and pressure release
Explanation:
The weathering is a process of disintegration of rocks into small pieces and sediments. This is caused by chemical or physical agents.
Mechanical weathering is also called as physical weathering. It is caused by the physical activities on the surface of rocks. The following are the examples of mechanical weathering.
1. Plant growth: The plants which grows over the surface of rocks, their roots may penetrate the rocks which causes the disintegration or rocks.
2. Animal actions: The animals may exert their pressure over the surface of rocks. They may create burrows like rat or mice inside the rocks.
3. Pressure release: The rock which was under pressure, instantly if pressure released, the structure of rock will become unstable, this may lead to the disintegration of the rock.
Which energy transformation occurs in the core of a nuclear reactor?
nuclear energy mechanical energy
nuclear energy thermal energy
thermal energy nuclear energy
mechanical energy nuclear energy
pls help there is a similar question on here I just need the answer dummed down
Nuclear energy to thermal energy
Answer:
option B
Explanation:
The correct answer is option B
A nuclear reactor is a device which is used to control and initiate the chain reaction. It is basically used in for power generation which can be used for many other purposes like electricity generation etc.
The energy transformation occurs in the core of a nuclear reactor is from nuclear energy to thermal energy.
Which substance is a compound iron or nitrogen oxide
Answer:
Nitrogen oxide is compound.
Explanation:
Compound is defined as chemical substance made up two or more than two different elements. For example : NaOH is the compound made up of 1 sodium atom, 1 oxygen atom and 1 hydrogen atom.
Now, according to the question, out iron and nitrogen oxide. Nitrogen dioxide (NO)is a compound because its made up of one nitrogen atom and 1 oxygen atom.
Where as iron is not a compound because it is just composed of iron atoms only.
Element for mercury symbols
Answer:
Mercury
Chemical element
Symbol: Hg
Explanation:
Please mark brainliest and have a great day!
Answer:
you can probably find that on google.
Explanation:
Carbon (C): 1sH2sI2pJ H = I = J =
Answer:H=2 I=2 J=2
Explanation:
Answer:
H= 2
I= 2
J=2
Explanation:
Just did this answer on ingenuity. :)
How many grams of chloride are found in 72.03mg of magnesium chlorate?
Answer:
26.73 mg.
Explanation:
Firstly, we can calculate the no. of moles of magnesium chlorate (Mg(ClO₃)₂):no. of moles of magnesium chlorate (Mg(ClO₃)₂) = mass/molar mass = (72.03 mg)/(191.21 g/mol) = 0.377 mmol.
Every 1.0 mole of magnesium chlorate (Mg(ClO₃)₂) contains 2.0 moles of Cl.
∴ The no. of moles of Cl in magnesium chlorate (Mg(ClO₃)₂) = 2(0.377 mmol) = 0.754 mmol.
∴ The mass of Cl are found in 72.03 mg of magnesium chlorate (Mg(ClO₃)₂) = (no. of moles of Cl)(atomic mass of Cl) = (0.754 mmol)(35.453 g/mol) = 26.73 mg.
Which of the following describes work?
holding a 1 kg mass for 1 hr
holding 1 kg mass
moving 1 m in 1 hr
lifting a 1 kg mass 1 m
Answer:
lifting a 1 kg mass 1 m.Explanation:
Work is the result of applying a force that manages to move a mass.
Thus, the work (mechanical work in this case because this is a mechanical force, not an electrical one) applied by a constant force is the product of the force times the distance that the object is moved.
Also, you can calculate the mechanical work as the difference in the mechanical energy between the initial and the final stages of the event where the force was applied.
Let's see each choice:
a) Holding a mass for 1 hr: since no translation is involved, displacement is and the work is zero.
b) Holding 1 kg mass: again, no motion is involved, so there is no work.
c) Moving 1 m in 1 hr: there is not force involved in this statement, so there is not work.
d) lifting a 1 kg mass 1 m: this, indeed, describes a situation where work results from applying a lifting force to move a mass 1 m up.
In this case, such work is equal to the change in the potential energy of the mass: mgΔh = 1kg × 9.8m/s² × 1 m = 9.8 joules.
Answer:
D lifting a 1 kg mass 1 m
Explanation:
Took the test and got 100%
A substance is dissolved in water and produces hydronium ions. This occurs when hydrogen ions move from the substance to
associate with water molecules. Which term best matches the behavior of this substance?
Arrhenius base
Arrhenius acid
Bronsted-Lowry base
Bronsted-Lowry acid
Mark this and return
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Answer:
Arrhenius acid
Explanation:
The arrhenius theory conceptualizes an acid as a substance that interacts with water to produce excess hydroxonium ions in an aqueous sloution. Hydroxonium ions results when the oxygen atom of water chemically bonds with the protons released by the acid.
An arrehnius base interacts with water to yield excess hydroxide ions in an aqueous solution.
A Bronsted-Lowry base as a proton acceptor.
A Bronsted-Lowry acid is a proton donor.
Answer:
b
Explanation:
HBr + H₂SO₄ SO₂ + Br₂ + H₂O
whats the oxidizing agent and whats the reducing agent?
Answer: Sulfur is the oxidizing agent and bromine is the reducing agent.
Explanation:
Oxidation reaction is defined as the reaction in which an atom looses its electrons. Here, oxidation state of the atom increases.
[tex]X\rightarrow X^{n+}+ne^-[/tex]
Reducing agents are defined as the agents which reduces the other substance and itself gets oxidized. These agents undergoes reduction reactions.
Reduction reaction is defined as the reaction in which an atom gains electrons. Here, the oxidation state of the atom decreases.
[tex]X^{n+}+ne^-\rightarrow X[/tex]
Oxidizing agents are defined as the agents which oxidize other substance and itself gets reduced. These agents undergoes reduction reactions.
For the given chemical reaction:
[tex]2HBr+H_2SO_4\rightarrow SO_2+Br_2+2H_2O[/tex]
The half reactions for the above reaction are:
Oxidation half reaction: [tex]2Br^-\rightarrow Br_2+2e^-[/tex]
Reduction half reaction: [tex]S^{+6}+2e^-\rightarrow S^{+4}[/tex]
From the above reactions, bromine is loosing its electrons. Thus, it is getting oxidized and is considered as a reducing agent.
Sulfur is gaining electrons and thus is getting reduced and is considered as an oxidizing agent.
Hence, sulfur is the oxidizing agent and bromine is the reducing agent.
Final answer:
In the reaction HBr + H₂SO₄ → SO₂ + Br₂ + H₂O, HBr is the reducing agent as it is oxidized to Br₂, and H₂SO₄ is the oxidizing agent as it is reduced to SO₂.
Explanation:
In the reaction HBr + H₂SO₄ → SO₂ + Br₂ + H₂O, you are tasked with identifying the oxidizing agent and the reducing agent. In this chemical reaction, hydrogen bromide (HBr) is being oxidized to bromine (Br₂) as it loses electrons. This makes HBr the reducing agent. On the other hand, concentrated sulfuric acid (H₂SO₄) is a powerful oxidizing agent and is reduced to sulfur dioxide (SO₂), making it the oxidizing agent.
what is the empirical formula of vanadium 1 oxide given that 20.38 grams of vandium combines with oxygen to form 23.58 grams of the oxide
Answer:
The empirical formula is V₂O
Empirical formula of a compound is the formula that shows the simplest whole number ratio of the atoms of elements in a given compound. Empirical formula is normally calculated when the mass of each element in a compound is known or the percentage composition by mass of each element in a compound is known.
Step by Step Explanation:
Step 1: Percentage composition of each element
Percentage composition=(mass of an element/ mass of the compound)100%
Mass of Vanadium = 20.38 g
Mass of the compound = 23.58 g
% composition of Vanadium = (20.38 g/23.58 g) 100%
= 86.43 %
Mass of Oxygen = 23.58 g -20.38 g
= 3.2 g
% composition of oxygen = (3.2/g/23.58 g) 100%
= 13.57%
Step 2: Find the number of atoms of each element in the compound
Number of atoms = percentage composition/ atomic mass
Atomic mass of Vanadium = 50.94 g/mol
Number of atoms of V = 86.43 /50.94
= 1.6967
Atomic mass of oxygen = 16 g/mol
Number of atoms of O = 13.57/16
= 0.8481
Step 3: Find the simplest ratio of atoms
Vanadium : Oxygen
1.6967 : 0.8481
= 1.6967/0.8481 : 0.8481/0.8481
= 2: 1
Whole number ratio = 2 : 1
Therefore; the empirical formula is V₂O
Answer:
[tex]V_2O[/tex]
Explanation:
Hello,
In this case, for the given vanadium oxide we have the general formula:
[tex]V_XO_Y[/tex]
Whereas both X and Y are determined as shown below:
- Find the mass percentage of both vanadium and oxygen:
[tex]\% V=\frac{20.38g}{23.58g}*100\%=86.43\% \\\% O=\frac{23.58g-20.38g}{23.58g}*100\%=13.57\%[/tex]
- Then the representative moles:
[tex]n_V=\frac{86.42}{51}=1.695\\n_O=\frac{13.57}{16}=0.8482[/tex]
- Finally X and Y:
[tex]X=\frac{1.695}{0.8482}=2\\\\Y=\frac{0.8482}{0.8482}=1[/tex]
Thus, the empirical formula is:
[tex]V_2O[/tex]
Best regards.
What is the correct name for the compound CoCl3?
a) cobalt(I) chloride
B) cobalt(I) chlorate
C) cobalt(II) chlorate
D) cobalt(III) chloride
Answer:
D) Cobalt (III) chloride.
Explanation:
It is an unstable compound in which the cobalt atoms have a formal charge of +3.
It could be stable but at very low temperatures, while at high temperatures it is found as a gas.
I hope this answer helps you.
Cobalt(III) chloride, often known as cobaltic chloride, is an elusive and unstable cobalt and chlorine chemical with the formula CoCl₃. The cobalt atoms in this combination have a formal charge of +3. Here the correct option is D.
Due to its special characteristics, cobalt chloride (CoCl₃) is a chemical substance that is frequently utilized in scientific study. It is a crystalline solid that is pinkish-red and soluble in ethanol and water. Cobalt ions, which are necessary for the growth and development of both plants and animals, can be found in cobalt chloride.
Cobalt(III) chloride, often known as cobaltic chloride, is an elusive and brittle cobalt and chlorine chemical with the formula CoCl₃. The cobalt atoms in this combination have a formal charge of +3.
Thus the correct option is D.
To know more about Cobalt(III) chloride, visit;
Please help!!!
Notice that the exponent is very close to -1. The equation is essentially in the form of V=kP-1
A proportion
An inverse proportion
A linear relationship
A quadratic relationship
A direct proportion
The equation has a quadratic relationship, since the equation has K and P. This indicates that its Non-linear equation but quadratic.
Hope This Helps!!!
Please Mark Brainliest!!!
Answer:
An inverse proportion
Explanation:
What happens when the pressure of a gas is lowered
Hello There!
If this happens, the molecules collide less frequently.
the molecules collide less frequently
Explanation:
a p e x trust me
0.66y = 0.9x + 0.48 If y has a value of 108.45 what is the value of x?
Answer:
y=108.45
0.66y=0.9x+0.48
0.66*108.45 =0.9x+0.48
71.577=0.9x+0.48
71.577-0.48=0.9x
71.097=0.9x
x=71.097/0.9
x=78.99667
Which is a substance that is made up of only one type of atom?
O compound
O element
solution
O mixture
Answer:
compound
Explanation:
An element is the type of substance that is made up of only one type of atom. It cannot be broken down further into other types of substances. Compounds and mixtures, on the other hand, contain more than one type of atom.
Explanation:The substance that is made up of only one type of atom is an element. An element is a pure substance that cannot be broken down into other types of substances. Each element is made up of just one type of atom. Examples of elements include Oxygen(O), Hydrogen(H), or any substance on the periodic table of elements. On the other hand, a compound is a substance that is made up of more than one type of atom bonded together. An example of this is water (H₂O), which consists of hydrogen and oxygen atoms. Lastly, a mixture is a combination of two or more elements or compounds which have not reacted to bond together, and each component in the mixture retains its original properties.
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Describe two techniques used to measure the PH of a solution
Answer:
ph paper, or a ph meter
Explanation:
Answer:
Measure H+ concentration or measure OH- concentration
Explanation:
Since pH is basically the number of H+ ions in a solution, that's what you're trying to find. (it's actually -log of H+, which is irrelevant since this is a conceptual question). You can do this with a variety of chemicals.
And p,OH is always 14-pH. So you can also use the number of OH- ions to find p,OH, which can find pH.
hope this helps
In a molecule of two electron dot structures describe the bond equally well?
Answer:
The correct answer for this is: [tex] O _ 3 [/tex].
Explanation:
It is in a molecule of O3 that the two electron dot structures describe the bond equally well.
The [tex] O _ 3 [/tex] molecule is called trioxygen and more commonly known as ozone. It is a pale blue colored gas having a strong pungent smell.
This inorganic molecule is widely used in the oxidation process in the industries as well as consumer application.
An atom has atomic number 5 and mass number 11. How many protons does the atom have? 5 6 10 11
The atom having 5 as the atomic number, and 11 has the mass number have 5 protons. Thus, option A is correct.
What is mass number?In an atom, the nuclei consists of protons and neutrons. The sum of the protons and neutrons in an atomic nuclei determines its mass number.
The atomic number of an atom is the number of protons in an atom. Thus, the number of protons in an atom in 5. Hence, option A is correct.
Learn more about mass number, here:
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If 10.5 L of a gas at 0.98 atm has its pressure increased to 1.50 atm, what is the new volume?
Answer:
The new volume of this gas is 6.86 liters.
Assumption: the temperature of this gas stays the same, and this gas is ideal such that Boyle's Law applies.
Explanation:
By Boyle's Law, the volume of an ideal gas shall be inversely proportional to the pressure on it when temperature stays the same (as in an isothermal process.)
In other words,
[tex]\displaystyle V \propto \frac{1}{P}[/tex],
where
[tex]V[/tex] is the volume of the gas, and[tex]P[/tex] is the pressure on the gas.[tex]P_1 \cdot V_1 = P_2 \cdot V_2[/tex].
[tex]\displaystyle V_2 = \frac{P_1 \cdot V_1 }{P_2}[/tex].
Assume that this gas is ideal. Also assume that this increase in pressure is isothermal. Apply Boyle's Law to find the new volume of this gas:
[tex]\displaystyle V_2 = \frac{P_1 \cdot V_1 }{P_2} = \rm \frac{0.98\;atm \times 10.5\; L}{1.50\; atm} = 6.86\; L[/tex].
Gravity is a force that helps to hold the universe together.
Final answer:
Gravity is an ever-present, attractive force that holds together the Universe, from maintaining our footing on Earth to influencing the motions of galaxies and beyond. It is defined by Newton's law of gravitation and further explored in the theory of general relativity.
Explanation:
Gravity is a fundamental force of nature that is always attractive, causing objects with mass to be pulled toward each other. Even though gravity is the weakest of the four fundamental forces, it plays a crucial role in structuring the Universe. From binding us to the surface of Earth to keeping planets in orbit around the Sun, and even holding galaxies together, gravity is essential for the existence and movement of celestial bodies. Newton's universal law of gravitation states that gravitational force is directly proportional to the masses of the objects involved and inversely proportional to the square of the distance between their centers. On a cosmic scale, gravity is the dominant force and is important for understanding the interactions of matter in space and time. Additionally, in the realm of general relativity, gravity is responsible for curving space and altering the flow of time near massive bodies like stars.
At 20°C, a sample of H2O liquid and a sample of CO2 gas each have the same average kinetic energy. Why is one a liquid and the other a gas at this temperature?
Answer:
Water has a strong hydrogen bond which is absent in carbon (IV) oxide.
The net forces of attraction between water molecules is greater than the kinetic energy thus water molecules cannot move far away from each other but slide over each other.
Carbon (IV) oxide molecules are held together by weak Van der waals forces which are overcome by the kinetic energy of the molecules. This makes the molecules move easily in random directions.
Answer:
The particles in the H2O liquid are more attracted to each other.
Explanation:
just got it right in study Island
what is internal energy is
Answer:
According to Brittanica, "Internal energy [is] the property or state function that defines the energy of a substance in the absence of effects due to capillarity and external electric, magnetic, and other fields."
please answer asap need by Wednesday morning
Calculate the pH of 0.16M CH3COOH which has Ka = 1.74 x 10-5 mol dm-3
best answer will be brainliest
Answer:
5.555.
Explanation:
∵ pH = - log[H⁺],
[H⁺] for weak acids = √Ka.C.
Ka for CH₃COOH = 1.74 x 10⁻⁵, C = 0.16 M.
∴ [H⁺] = √Ka.C = √(1.74 x 10⁻⁵)(0.16 M) = 2.784 x 10⁻⁶ M.
∴ pH = - log[H⁺] = - log(2.784 x 10⁻⁶ M) = 5.555.
Charles’s law states that _____.
Charles's law states that the volume of a gas is directly proportional to its Kelvin temperature when the pressure is constant.
Charles's law states that the volume of a given amount of gas is directly proportional to its temperature in the Kelvin scale, as long as the pressure remains constant.
This means that if you increase the temperature of a gas, its volume will also increase proportionally, and vice versa, provided that the pressure does not change.We can express this relationship mathematically as V/T = constant, where V is the volume and T is the temperature in Kelvin.
For example, if you have a balloon filled with air, and you heat it, the balloon will expand because the volume of the gas inside the balloon increases with temperature.In summary, Charles's Law helps us understand how gases behave under different temperatures, making it an important principle in the study of gases and their properties.
What is the magnitude of the force of gravity between to 1000 kg cars which are separated by distance of 25. 0 km on an interstate highway? The force between the two cars will be what
Answer:
=1.068 ×10⁻¹³N
Explanation:
Force of gravity =Gm₁m₁/d² where G is the universal gravitation constant =G = 6.673 x 10-11 N m²/kg², m₁ and m₂ is the mass of object 1 and 2 respectively and d is the distance between them. First we change the distance into SI units i.e meters 25 km= 25000 m
F= (6.673 x 10⁻¹¹ N m²/kg²×1000 kg×1000 kg)/ (25000 m)²
=1.068 ×10⁻¹³N
Final answer:
The magnitude of the force of gravity between two 1000 kg cars separated by 25.0 km is 1.067 × 10^-6 Newtons, using Newton's law of universal gravitation.
Explanation:
To calculate the magnitude of the force of gravity between the two 1000 kg cars separated by 25.0 km, we can use Newton's law of universal gravitation, which is expressed by the formula:
F = G × (m1 × m2) / r2
Where:
F is the force of gravity between the two masses,G is the gravitational constant (6.674 × 10-11 N × (m/kg)2),m1 and m2 are the masses of the two objects, and r is the distance between the centers of the two masses.
Putting in the given values:
F = (6.674 × 10-11 N × (m/kg)2) × (1000 kg × 1000 kg) / (25,000 m)2 = 1.067 × 10-6 N
Thus, the force of gravity between the two cars is extremely small, 1.067 × 10-6 Newtons, which is consistent with the fact that the gravitational force is very weak at such distances and with masses as small as that of cars.