Answer:
Ethanol is oxidised by acidified sodium dichromate in a test tube reaction, firstly to form ethanal (acetaldehyde), and with further oxidation, ethanoic acid (acetic acid)
Procedure
Place about 3 cm3 of acidified sodium dichromate solution in a boiling tube.
Use a teat pipette to add 5–7 drops of ethanol, with shaking.
Cool the mixture in the tube under a tap. Note the sweetish smell of ethanal (acetaldehyde) at first, then becoming sharper as oxidation continues and forms ethanoic acid (acetic acid).
When the reaction has subsided, the mixture can be warmed gently; the smell of ethanoic acid will become more noticeable.
The process of how we would obtain ethanal free from ethanol is described in the explanations below.
In Chemistry, Ethanol undergoes oxidation in the presence of sodium dichromate plus sulphuric acid to yield ethanal and water.
The procedure for achieving this in the laboratory is as follows;
Step 1; Measure a quantity of a solution of sodium dichromate acidified in a dilute sulphuric acid and pour into a test tube.Step 2; Add excess ethanol. This is because if we don't do so there will be plenty of oxidizing agent to carry out a second operation which changes the aldehyde to ethanoic acid. However, we need only the aldehyde. Step 3; When the aldehyde ethanal begins to form which will be evident by the change in the colour of solution from orange to green, then the mixture should be distilled from the test tube and tbethe aldehyde collevted so that it doesn't undergo additional oxidation into ethanoic acid.Read more at; https://brainly.in/question/18574624
What is the difference between the mass number and the atomic mass? Why is the
mass number a good approximation for atomic mass
Answer:
The mass number is the sum of the number of protons and neutrons in an atom. It is a whole number. The atomic mass is the average number of protons and neutrons for all natural isotopes of an element
An element's mass number (A) is the sum of the number of protons and the number of neutrons. ... This approximation of mass can be used to easily calculate how many neutrons an element has by simply subtracting the number of protons from the mass number. Protons and neutrons both weigh about one atomic mass unit or amu
The negatively charged particle that is released from the nucleus at high speeds is the _____.
a. alpha particle
b. beta particle
c. neutron
d. gamma ray
Answer:
The negatively charged particle that is released from the nucleus at high speeds is the beta particle.
Balance the following redox reaction by ion electron method.Cr2O72- + H2S → Cr3+ + S (in basic medium)
Answer:
gdfktfnfgh trhdfih tdjgd
How do I find the average atomic weight of an element
Answer:
To calculate the average atomic mass, multiply the fraction by the mass number for each isotope, then add them together.
hope this helps <3
How can i study smater
Answer:
study....................
Explanation:
1.Short sessions
2.Sleep well
3.Set goal
4Aim to learn as if you were to teach
Ethan makes the table below to record his observations when mixing baking soda and vinegar in a beaker. Ethan claims that a chemical change has occurred. Which statement provides the BEST evidence to support his claim?
Answer: a
Explanation:
Many bubbles formed after mixing.
The statement which best provides support for the fact that a chemical change has occurred is that many bubbles formed after mixing.
In a chemical change, new substances are formed and there is a recombination of the atoms in reactants as the products are being formed.
There are several cues that indicate that a chemical change has taken place such as;
Appearance of a solid in an aqueous phase reaction.Evolution of gasSudden change in the temperature of the systemChange in the color of the systemIn the particular instance in this question, when baking soda and vinegar were mixed together, a gas was evolved signifying that a chemical change has taken place.
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Which of the following helps us see atoms? (20 points including brainliest if correct)
A. Advanced telescopes
B. Our eyes
C. Large hand lenses
D. Powerful microscopes
Answer:
D.) powerful microscopes ....... telescopes are for space our eyes can't see atoms and hand lenses are not gonna do you any good
The word "atom" means:
-the smallest imaginable thing
-that which cannot be cut
-everything that is not vacuum
-that which cannot be seen
Answer:
atoms as a source of nuclear energy.
noun: the atom
"the power of the atom
that which cannot be cut or indivisible
List the three pieces of evidence for sea floor spreading that also support the theory of continental drift
Answer:
molten material, seafloor drilling, radiometric age dating and fossil ages, and the magnetic stripes
Explanation:
3.5 x 10^15 atoms of sodium to moles of sodium
Answer:
Explanation:
· 3.5 x 10^15 atoms of sodium to moles of sodium. Answers: 1 Show answers : ) Another question on Chemistry. Chemistry, 21.06.2019 22:30. Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u. Answers: 1. Answer. Chemistry,
1. Write the name for the following:
a. Phosphoric acid
b. Hydroiodic acid Nitrous acid
d . Hypochlorous acid
When the metallic element sodium combines with the nonmetallic element bromine (Br2), is the product a solid, liquid, or gas at room temperature?
I will give brainliest if you can explain how one would know this information.
Answer: it is a solid at room temperature.
Explanation:
The ions of the two reactants are Na{+} and Br{-}, so the formula of the product is NaBr.
and when the NaCl is a solid a room temperature. and when NaBr has similar properties to NaCl, so NaBr is a solid at room temperature too.
so our chemical formula for the product is NaBr and It's a solid at room temperature.
Nh3 metabolism - Urea cycle
Answer:
Ammonia is a toxic product of nitrogen metabolism which should be removed from our body.
The urea cycle or ornithine cycle converts excess ammonia into urea in the mitochondria of liver cells.
The urea forms, then enters the blood stream, is filtered by the kidneys and is ultimately excreted in the urine.
Which of these determines whether a fertilized egg develops into a toad, a snake, or a lizard?
A
the sex of the egg
B.
the age of the egg
С
the size of the egg
D
the genes of the ogg
Answer:
D
the genes of the egg determine
4. What is the energy of a photon that has a wavelength of 400 nm?
Answer:
4,9725*10⁻¹³[J].
Explanation:
all the details are in the attached picture, answer is marked with orange colour.
Help pls 30 POINTS!!
Answer:
protons: 6
neutrons: 8
electrons:6
Cereal is an example of what
mixture
Answer:
a heterogenous mixture
Explanation:
a heterogenous mixture is a mixture that you can see the different things in it. A homogenous mixture is when you cant see the objects in the mixture
How does acid causes tooth decay ? How to prevent it ?
Explanation:
Foods and beverages that are high in acids wear away the enamel that protects your teeth, a process known as tooth erosion. This changes the appearance of your teeth and opens the door for bacteria that can cause cavities or infection.
You can reduce tooth erosion from what you eat and drink by following these tips: Wait an hour before you brush after eating acidic foods to give your saliva a chance to naturally wash away acids and re-harden your enamel. Limit – or avoid – acidic beverages like soft drinks. If you do indulge, use a straw.
hope this helps you.
Explanation:
Tooth decay starts when pH of the mouth is lower than 5.5 .This is caused when bacteria present in the mouth produce acid by degradation of sugar and food particles remaining in the mouth after eating.
To prevent this, we should clean the mouth after eating food. Using toothpaste, which are generally basic, for cleaning the teeth can neutralise the excess acid and prevent tooth decay.
What volume of 0.1000 Mstomach acid (HCl) could one tablet neutralize?
ml
Answer:
normal volume of the stomach fluid is 20 to 100 mL and the pH is acidic (1.5 to 3.5).
Explanation:
3 Physical properties of boron?
Answer:
Atomic Symbol: B
Atomic Number: 5
Element Category: Metalloid
Explanation:
Every compound is a molecule, but every molecule is not a compound. Why is this? Give an example with your answer. Plz help mehhh TvT
Answer:
By definition, a molecule is a group of atoms bonded together. This means that it can be a mixture of two separate atoms (e.g. atom A and atom B bond together to make molecule AB). Molecules with two or more separate elements are called compounds.
Molecules can also be made of more than one atom of the same element (e.g. atom A bonds to another A atom to make molecule AA). This is not called a compound because they are not different elements.
Perform the following calculation and report the answer with the correct number of significant figures.
81.72 +0.73 =
Answer:
81.72 +0.73=82.45
Explanation:
you need to add it1
81.72
+0.73
= 82.45
82.72 + 0.73 = 82.45
Explanation:
0.72+0.73 = 1.45
Therefore 81+1.45= 82.45 ( Integer in addition with a decimal number).
What is a periodic table ?
Answer:
The periodic table is a tabular array of the chemical elements organized by atomic number, from the element with the lowest atomic number, hydrogen, to the element with the highest atomic number, oganesson.
Answer:
A periodic table is a table filled with chemical elements. They are organised by their atomic number and how many electrons each element contains
Balance the following chemical equation and determine the number of moles of Fe(s) produced when 8.1E-1
moles of Fe2O3(s) react with excess C(s) to produce Fe(s) and CO2(g).
Fe2O3(s) + C(s) ——)Fe(s) + CO2(g)
Answer:
2Fe2O3 + 3C → 4Fe + 3CO2
Explanation:
The balanced reaction of Ferric oxide with carbon to form Iron and Carbon dioxide can be written as follows:
[tex]2Fe_{2} O_{3} +3C\rightarrow4Fe+3CO_{2}[/tex]
The moles of iron produced is[tex]16.2*10^{-1}[/tex]
What is balanced equation?Balanced equation is the one where the number of atoms of each species is same on reactant and product side. In balanced equation mass can neither be created nor be destroyed.
The atoms of Oxygen on reactant side is 3 while on product side is 2 so multiply Ferric oxide by 3 and carbon dioxide by 3
so now our equation becomes
[tex]2Fe_{2} O_{3} +C\rightarrow Fe+3CO_{2}[/tex]
The number of Carbon atoms on left side is one while on right side it is 3 so multiply by 3
[tex]2Fe_{2} O_{3} +3C\rightarrow Fe+3CO_{2}[/tex]
The number of Iron atoms on left is 4 while on right it is 1 so multiply by 4
[tex]2Fe_{2} O_{3} +3C\rightarrow4Fe+3CO_{2}[/tex]
From 2 moles of Ferric oxide 4 moles of iron is produced
from 1 mole mole of ferric oxide 2 moles of Iron is produced
From [tex]8.1*10^{-1}[/tex] mole of ferric oxide 2×[tex]8.1*10^{-1}[/tex] moles of iron are produced.
Hence the balanced equation is
[tex]2Fe_{2} O_{3} +3C\rightarrow4Fe+3CO_{2}[/tex]
the number of mole of Iron is [tex]16.2*10^{-1}[/tex]
Learn more about the balanced equations, here:
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An adult human lungs can only hold a volume of up to 6.0 L of air when fully expanded. Suppose that at sea level where the pressure is 1.00 atm, a sky diver traps 3.0 L of air in her lungs and holds her breath before rapidly ascending to an altitude where the pressure drops to 0.46 atm. If she doesn't exhale, determine if her lungs will rupture at this high altitude, then complete the sentence:
Answer:why would i know
Explanation: sorry
A neutral atom of a astatine would have how many electrons 33,85,125,or 210
Use the equation to answer the question.
Which type of radioactive decay does the equation model?
beta-minus decay
gamma decay
beta-plus decay
alpha decay
Answer:
1. D
2. B
3. A
4. B
5. A
Explanation: just finished quick check
The equation is an example of beta-minus decay.
In a beta-minus decay, an electron is converted to a proton. When this happens, the atomic number of the daughter nucleus increases by one unit above the atomic number of the parent nucleus.
Looking at the equation, we can see that the atomic number of the daughter nucleus increased by one unit above that of the parent nucleus while the mass number of both the parent nucleus and daughter nucleus remained the same. Therefore, a beta-minus decay has taken place.
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state the name of the substance produced by a chemical reaction
Answer:
These starting substances of a chemical reaction are called the reactants, and the new substances that result are called the products.
Explanation:
1-Link the concepts of mole, molar mass, number of atoms, Avogadro’s
number and mass using a flowchart or mind map.
2-Rearrange the two equations to make each variable the focus (you will end up with three variations for each equation).
3- Record the equations for number of moles and number of particles (and
each equation triangle) - Annotate each symbol with what it means and definition and the units.
Answer:
hope its helpful. Good luck
0.1 points
Which orbital-filling diagram represents the ground state of oxygen?
O [He]
11
2s
2p
1
[He]
们个个
2p
2
2s
โต | 44 |
O
[He]
11 111
2p
3
2s
O
[He] ]
们
2s
N
4
2p
5
Previous
Answer:
Abe chutiye, Question sahi se likh laude phle