Answer:
Paracetamol
Formula
C8H9NO2
Are all the wax rings melting at the same time?
Answer:yes
Explanation:
this is because the distance doesnt matter
How many moles of iron are in 50.0g of iron? How many iron atoms are in 50.0g of iron?
Answer:
50g iron comprises 5.376 × 1023 atoms.
Explanation:
I need helpppp pleaseeee!!
Answer:
Box#:
1:CoS
2:Co2S3
3:CoSO4
4:Co2(SO4)3
5:CoSO3
6:Co2(SO3)3
Explanation:
1:Co(II) is -2 and S is -2, so the charges cancel
2:Co(III) is -3 and is -2, so you cross the charges but do not reduce
3:Co(II) is -2 and SO4 is -2, so the charges cancel
4:Co(III) is -3 and SO4 is -2 so the charges cross but do not reduce
5:Co(II) is -2 and SO3 is -2 so the charges cancel
6:Co(III) is -3 and SO3 is -2 so the charges once again cross
Answer:
Cobalt (II) sulfide → CoS
Cobalt (III) sulfide → Co₂S₃
Cobalt (II) sulfate → CoSO₄
Cobalt (III) sulfate → Co₂(SO₄)₃
Cobalt (II) sulfite → CoSO₃
Cobalt (III) sulfite → Co₂(SO₃)₃
Define valence electrons.
Answer:
Electrons on the outermost shell of an atom. They are responsible for the chemical properties of an atom.
Unlike solids and liquids, gases can be compressed. How is this physical characteristic of gases beneficial to society?
Chemical properties of water for class 8
Answer:
pH value is 7neither acidic nor basecan be found in all 3 state (ie. liquid, solid and gas {vapour})it's excellent solventIs it possible to move the atoms close enough that the nuclei come in contact?
Answer:
I believe not.
Explanation:
From what I have been told atoms can never come into contact beyond the electron barrier.
determine the ph of a buffer that is 0.55 M HNO2 and 0.75 M KNO2. tha value of Ka for HNO2 is 6.8*10^-4
Answer:
pH = 3.3
Explanation:
Buffer solutions minimize changes in pH when quantities of acid or base are added into the mix. The typical buffer composition is a weak electrolyte (wk acid or weak base) plus the salt of the weak electrolyte. On addition of acid or base to the buffer solution, the solution chemistry functions to remove the acid or base by reacting with the components of the buffer to shift the equilibrium of the weak electrolyte left or right to remove the excess hydronium ions or hydroxide ions is a way that results in very little change in pH of the system. One should note that buffer solutions do not prevent changes in pH but minimize changes in pH. If enough acid or base is added the buffer chemistry can be destroyed.
In this problem, the weak electrolyte is HNO₂(aq) and the salt is KNO₂(aq). In equation, the buffer solution is 0.55M HNO₂ ⇄ H⁺ + 0.75M KNO₂⁻ . The potassium ion is a spectator ion and does not enter into determination of the pH of the solution. The object is to determine the hydronium ion concentration (H⁺) and apply to the expression pH = -log[H⁺].
Solution using the I.C.E. table:
HNO₂ ⇄ H⁺ + KNO₂⁻
C(i) 0.55M 0M 0.75M
ΔC -x +x +x
C(eq) 0.55M - x x 0.75M + x b/c [HNO₂] / Ka > 100, the x can be
dropped giving ...
≅0.55M x ≅0.75M
Ka = [H⁺][NO₂⁻]/[HNO₂] => [H⁺] = Ka · [HNO₂]/[NO₂⁻]
=> [H⁺] = 6.80x010⁻⁴(0.55) / (0.75) = 4.99 x 10⁻⁴M
pH = -log[H⁺] = -log(4.99 x 10⁻⁴) -(-3.3) = 3.3
Solution using the Henderson-Hasselbalch Equation:
pH = pKa + log[Base]/[Acid] = -log(Ka) + log[Base]/[Acid]
= -log(6.8 x 10⁻⁴) + log[(0.75M)/(0.55M)]
= -(-3.17) + 0.14 = 3.17 + 0.14 = 3.31 ≅ 3.3
why the mixture of bromine and ethane is discoloured when left in the sun
Answer:
In the presence of UV light, ethane will react with bromine in a substitution reaction. UV light is the condition under which the reaction will occur so it is written above the arrow in the chemical equation. As the reaction proceeds, the intensity of the re-brown colour of the bromine water decreases.
Answer:
here ya go
Explanation:
combining bromine and ethane leads to a brown gas or liquid which is made of the elements. it is a gas at room temperature and does not affect human beings. there are many uses for bromine compounds but they are mainly used for the manufacturing of chlorine, fire retadants, water purification, graphy chemicals and pharmaceutcals. it is a naturally occurring element that can be found in animals such as sharks since they produce their own.
I have to answer questions about science
Answer:
What Questions?
Explanation:
What Questions?
Answer:
Explanation:
What is the Questions frist ?
What do the carbon, oxygen, and nitrogen cycles all have in common? a. They all include an exchange of gases with the atmosphere. b. None of the cycles are biogeochemical cycles. c. They are all byproducts of photosynthesis. d. They all sustain life, but living organisms have no part in the cycle. Please select the best answer from the choices provided A B C D
How many molecules are in 25.3g of C2H4O
Answer:
0.57 molecules
Explanation:
Imagine a basketball filled with liquid water.Would the basketball still hold the same number of molecules? Can you use
22.4 L/mol as the molar volume for liquid water
Answer:
Yes !
Explanation:
The ball will have more molecules.
a basketball filled with liquid water. yes we use 22.4 L/mol as the molar volume for liquid water.
what are the properties of water ?Water is the chemical substance having chemical formula H2O, one molecule of water consist of two hydrogen atoms which are covalently bonded to a single oxygen atom.
The physical property of Water are, it is a colorless and tasteless liquid, have extensive hydrogen bonds resulting in unusual properties in the condensed form.
This also have high melting and boiling points. As compared to other liquids, water has a higher specific heat, thermal conductivity, surface tension, dipole moment, etc.
Water is a great solvent and helps in the transportation of ions and molecules required for metabolism, has high latent heat of vaporization helps in the regulation of body temperature.
It is Amphoteric nature can act as both acid and base means that it is amphoteric in nature, it is Electropositive elements which reduce water to hydrogen molecule and it is the source of hydrogen.
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How are covelant and ionic bonds different and what types of elements combine to form each?
Answer:
Ionic bonds result from the transfer of electrons from one atom to another
Explanation:
In covalent bonds, atoms share electrons, whereas in ionic bonds atoms transfer electrons. The reaction components of covalent bonds are electrically neutral, whereas for ionic bonds they are both charged.Covalent bonds are formed between two non-metals, whereas ionic bonds are formed between a metal and non-metal.
Answer:
Covalent bonds are defined as sharing of electrons, ionic bonds are the result of transferred electrons;
Covalent bonds form between non-metals (elements) and ionic bonds form between metal and non-metals (ions)
The graph below shows the solute concentration inside a paramecium over time. What is happening at the time indicated by the pointer?
Water is moving rapidly into the paramecium by osmosis.
Water is moving rapidly out of the paramecium as the contractile vacuole contracts.
The paramecium is having a meal.
Solutes from the surrounding water are diffusing through the cell membrane, causing the solute concentration inside the paramecium to rise.
The pointer indicated the point at which water is moving rapidly out of the paramecium as the contractile vacuole contracts.
The pointer specifically indicates where the water solute concentration dropped. In order for the solute concentration of the water to drop, more water would have to be added.This means that water from the paramecium moves into the surrounding water as the contractile vacuole contracts. Consequently, the solute concentration of the surrounding solution decreases. When water moves from the solution into the paramecium, the solute concentration increases and this forms a continuous cycle in the graph.More on water movement by osmosis can be found here: https://brainly.com/question/21395644?referrer=searchResults
Which pair of objects is experiencing the greatest gravitational force?
2 kg
2 kg
A.
d = 5 m
2 kg
2 kg
B.
dolm
5 kg
skg
doim
3 kg
skg
OD
da 5 m
Answer:
c
Explanation:
bonding and kinetic energy quick check
1. The internal energy within a system associated with the motion of particles and that can be added to a substance is called (1 point)
o temperature
O kinetic energy
O thermal energy
O electrostatic forces
2. which statement describes the effect of adding more energy to a system, assuming a phase change does not occur?
0 the particles within the system will have greater motion and the temperature will increase
0 the particles within the system will have greater motion and the temperature will be grace
0 particles within the system will have less motion and the temperature will increase
0 the particles within the system will have less motion and the temperature will decrease
3. which statement correctly describes how a tractions that holds particles break
0 attractions occur due to gravitational forces when particles move fast enough these forces can no longer keep particles together
0 attractions due to Electrostatic forces when particles move fast enough these forces can no longer keep particles together
0 attractions due to electrostatic forces when particles have low enough energy these forces can no longer keep particles together
0 attractions occurred due to gravitational forces when particles have low enough energy these forces can no longer keep particles together
4. Which statement explains why a rubber band analogy is not a perfect comprehension for Bonds in a substance when considering phases change
0 for a phase change from solid to liquid the bonds do not break completely and particles can still slide past each other
0 for a phase change from liquid to gas the bonds do not break completely the particles can still slide past each other
0 for a phase change from liquid to gas the bonds break completely and of particles can independently of each other
0 phase change from solid to liquid the bond breaks completely particles can move independently of each other
5.the boiling point of benzene is 80°C. which pair of samples will have the same average kinetic energy of benzene molecules?
0 two samples of gaseous benzene, at 80°C and the other 90°C
0 two samples of liquid benzene, one at 70°C and the other at 80°
0 a sample of liquid benzene at 70°C and a sample of gaseous benzene at 90°C
0 a sample of liquid benzene at 80°C and a sample of gaseous benzene at 80°celectric
When energy is added to a system during phase change, the particles move faster.
When a substance is heated, the internal energy within a system associated with the motion of particles and that can be added to a substance is called thermal energy.
During a phase change, when more energy is added to the system, the particles within the system will have greater motion and the temperature will increase.
The attractions that hold molecules together are electrostatic forces. The correct statement about the attractions that hold particles is that attractions between particles break when attractions due to Electrostatic forces when particles move fast enough these forces can no longer keep particles together.
Rubber band is not a perfect comprehension for Bonds in a substance when considering phases change because for a phase change from liquid to gas the bonds do not break completely the particles can still slide past each other.
The pair of samples that will have the same average kinetic energy of benzene molecules is a sample of liquid benzene at 80°C and a sample of gaseous benzene at 80°C.
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How are traits inherited?
Please explain thoroughly
inherited traits are passed from parent to offspring according to the rules of Mendelian genetics. Most traits are not strictly determined by genes, but rather are influenced by both genes and environment
Help with Complex Ions!
Determine the [Ag+] present in solution at equilibrium when the complexing agent ammonia is added to a 0.025 M solution of AgNO3 to result in a [NH3]eq = 0.15 M.
Solubility constant (Ksp) for Ag(NH3)2 2+ is 1.7 * 10^7.
The concentration of [Ag+] present in the solution is 6.53 × 10⁻⁸ M
From the given information, the equation for the reaction between silver ion and ammonia can be represented as:
Ag⁺ + 2NH₃ ↔ [Ag(NH₃)₂]⁺
Given that the solubility constant (Ksp) for the product formed = 1.7 × 10⁷.
The solubility constant for this reaction can be expressed as:
[tex]\mathbf{Ksp = \dfrac{[Ag(NH_3)_2]^+}{[Ag^+][NH_3]^2} }[/tex]
where;
concentration of ammonia = 0.025 Mconcentration of silver nitrate = 0.15 M[tex]\mathbf{1.7 \times 10^7 = \dfrac{0.025}{(x)(0.15)^2}}[/tex]
[tex]\mathbf{1.7 \times 10^7 = \dfrac{1.1111}{x}}[/tex]
[tex]\mathbf{x = 6.54 \times 10^{-8} \ M}[/tex]
Therefore, we can conclude that the concentration of [Ag+] = x = 6.54 × 10⁻⁸ M.
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what is an environmental result from burning fossil fuels?
Answer:
The burning of fossil fuels contributes to the addition of greenhouse gases to the atmosphere. These gases trap thermal energy in the Earth's atmosphere.
Describe the two categories used to classify physical changes.
Answer:
Physical changes can be classified as reversible or irreversible. Melting is an example of a reversible physical change.
Explanation:
Arrange the events for the hydrolysis of amide bonds by chymotrypsin in their correct order.
1. attack by Ser 195 to give a tetrahedral intermediate
2. protonation by His 57 and release of the free C-terminus of the hydrolyzed bond
3. protonation by His 57 and release of the free N-terminus of the hydrolyzed bond
4. attack by water, leading to formation of a tetrahedral intermediate
5. binding of substrate to properly position the scissile bond for cleavage
a. 5, 1, 3, 4, 2
b. 5,1,2,4,3 5,
c. 1, 3, 2,4 5,
d. 2, 4, 3, 1
Answer:
The answer is A
Explanation:
the order 5,1,3,4,2
Which was the first ""cell"" viewed by the light microscope?microbeatomdnaoak bark.
Answer:
The cork cell
Explanation:
help asap for brainlist
Answer:
Function A: +3
Function B: +2
y intercept is greater in Function B, the value is 16
Explanation:
What is an electrolysis
Answer:
Definition of Electrolysis :- Electrolysis, process by which electric current is passed through a substance to effect a chemical change. The process is carried out in an electrolytic cell, an apparatus consisting of positive and negative electrodes held apart and dipped into a solution containing positively and negatively charged ions.Explanation:
Hope this helps you dear ✌️Carry on learning !!What is oxidation state?
Answer:
a number assigned to an element in chemical combination which represents the number of electrons lost (or gained, if the number is negative), by an atom of that element in the compound
Explanation:
sodium, magnesium, iron is zero.
The definition of oxidation state is as follows: Oxidation state is a number given to the atom of an element when participating in a chemical reaction.
OXIDATION STATE:The atoms of elements are not always neutral i.e. carry no charge. They sometimes carry either positive or negative charges to become ions. Ions can either be cations (positively charged) or anions (negatively charged). The amount of charges are represented by numbers placed as a superscript in front of the element involved. These superscript charge assigned to a corresponding element during a chemical reaction is called oxidation state. The oxidation state of an element portrays the number of electrons gained or lost during the reaction.Therefore, oxidation state can be defined as a number given to the atom of an element when participating in a chemical reaction.
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what is an environmental result from burning fossil fuels?
Answer:
Burning fossil fuels emits a number of air pollutants that are harmful to both the environment and public health. Sulfur dioxide (SO2) emissions ...
what makes your pulse? Explain
Dividing the distance a wave travels by the time it takes to travel that distance gives you the wave’s speed.
True
False
Answer:
true
Explanation:
hope this helps
which characteristic do valence electrons indicate about reactions between atoms?
Bond number
The characteristic of reactions that depends on valence electrons is the bond type.
In chemistry, a chemical bond could be;
Ionic
Covalent
The type of bond formed depends on the number of valence electrons present. When there are few valence electrons on an atom, it mostly forms ionic bonds.
When there are more electrons on an atoms, it mostly forms covalent bonds and the electrons between the atoms are shared.