Answer:
Explanation:
Hydrolysis is a chemical decomposition involving breaking of a bond and the addition of elements
of water. In this hydrolysis of ester (ethyl acetate) with an alkali (sodium hydroxide), HCl was
used as catalyst to accelerate it. 1ml and 2ml of ethyl acetate was injected separately into the
500ml reactor vessels which contains 0.05N of NaOH and thoroughly mixed. At regular time
interval, 0, 10, 20, 30, 40, and 90 minutes, 25ml of each of the samples were withdrawn into a
250ml conical flask containing 0.05N HCl, and titrated against 0.05N NaOH solution using
phenolphthalein as indicator. From the titre values, the hydrolysis involving the 1ml ethyl acetate
was faster than that of the 2ml ethyl acetate, indicating that the higher the concentration the faster
the rate of reaction. The rate constant after evaluation from the graphs was approximately
0.003min-1
cm-3
for the 1ml and 2ml ethyl acetate, signifying that while the r
What is the actual yield of a reaction?
Answer:
In chemistry, yield, also referred to as reaction yield, is a measure of the quantity of moles of a product formed in relation to the reactant consumed, obtained in a chemical reaction, usually expressed as a percentage
The actual yield of the reaction is the calculated amount of product. The correct option is C.
What is a yield?Yield is the final product that was produced after some labor. It might be a reaction, or we might grow something, and the result would be agricultural produce. In chemistry, the yield is related to the product that came after a chemical reaction.
In chemistry, there are two types of yields:
Theoretical yieldActual yield.The theoretical yield is the yield that we assumed, and the actual yield is the yield that actually comes after the reaction.
Thus, the correct option is C. The calculated amount of product.
Learn more about yield, here:
https://brainly.com/question/1306952
#SPJ2
What is the total number of atoms in 3.0 molecules of propanone, CH3COCH3? (Avogadro’s constant = 6 x 1023 mol-1)
Answer:
1.81 x 10²⁴atoms
Explanation:
Given parameters:
Number of molecules = 3 moles
Unknown:
Number of atoms = ?
Solution:
To solve this problem, we are going to use the mole concept.
1 mole of any substance contains 6.02 x 10²³ atoms
So
3 mole of propanone will contain 3 x 6.02 x 10²³ atoms = 1.81 x 10²⁴atoms
A car advertisement states that a certain car can accelerate from rest to 70 km/h in 7 seconds. Find the car’s average acceleration.
Answer:
1 : 10
Explanation:
For every second the car accelerates 10km/h
If today is October 12th and we view a first quarter, on what date will we observe the next third quarter? i need help asap i will give 15 points
Answer:
It would be October 15th
Explanation:
The climate of an area is most affected by the amount of
A
animals in the region.
B
moonlight it receives.
C
people in the region.
D
sunlight it receives.
Answer:
D. I think
.........mm..
How many liters are in 75.0 grams of nitrogen gas at STP?
Answer:
60 liter
Explanation:
mass =75 gm
no of mole =75/28
now volume = 22.4 * 75/28 =60
Which element is a metalloid? selenium (Se) germanium (Ge) phosphorus (P) iodine (I)
Answer:
Ge
Explanation:
Answer:germanium (Ge)
Explanation:
A metalloid is an chemical element that exhibit a mixture of both metals and non metals properties. On the periodic table, they can be found on a zig-zagging line going downwards from the boron to the astatine,dividing nonmetals on the right and the metals on the left. '
They include
boron (B) silicon (Si)germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te), polonium (Po) and astatine (At).Germanium is hard, has a grayish-white luster appearance and brittle that it can shatter like glass.
...
See related question here:https://brainly.com/question/18738298
3.50M solution? Show your work!
What is the molarity of these solutions? Show your work!
a. 3.5 mol HBr in 500 mL of water
b. 0.0750 mol NaCl in 250.0 mL of water
c. 1.95 mol AgNO3 in 1.2 L of water
d. 0.500 mol NH3 in 2.5 L of water
Answer:
a number is correct answer 9
question: a group of similar organs doing the same job form the next step on the Ribbon of life which is
1. Connective tissue
2. An organ System
3. Nerve tissue
Answer:
the answer is An organ system
is neutralizing a base, physical or chemical property?
Answer:
I think it is chemical because neutral makes me think of acidity, which is a chemical property.
Which particle model diagram represents only one compound composed of elements X and Z?
Key
= atom of element X
= atom of element z
A
B
С
D
Answer:c
Explanation:
1. (04.01 LC)
Which of the following is an example of how science can solve social problems? (5 po
It cathstop excessive rain from occurring.
It can identify the sources of polluted water.
It can control the time and day when cyclones happen.
It can reduce the frequency of severe weather conditions.
2. (04.01 LC)
Science is used to stop things the are incrediblu diffucult to deal with therefore jeg spiser ikke dreng
The answer is
It can identify the sources of polluted water.
Which of the following is physical change!?
a. dissolving
b. evaporating
c. bending
d. all of the above
To Become or cause to become incorporated into a liquid so as to form a solution.
Evaporation:The process of changing from liquid to vapour.
Bending:To shape or force something straight, in a curve or angle.
___________________________________
A carbon-oxygen double bond in a certain organic molecule absorbs radiation that has a frequency of 6.00 x 1013 s-1. What is the wavelength of this radiation? To what region of the spectrum does this radiation belong? What is the energy of this radiation per photon? Per mole of photons? A carbon-oxygen bond in a different molecule absorbs radiation with a frequency equal to 5.40 x 10^13 s^-1. Is this radiation more or less energetic?
Answer:
5.0X10 -6 M-
Explanation:
The second radiation is less energetic than the former because it has a longer wavelength.
Recall that;
c = λf
c = Speed of light
λ = wavelength
f = Frequency
Now;
λ = c/f = 3 × 10^8 m/s/6.00 x 10^13 s-1
λ = 5 × 10^-6 m
Also;
When f = 5.40 x 10^13 s^-1
λ = c/f = 3 × 10^8 m/s/5.40 x 10^13 s^-1
λ = 5.6 × 10^-6 m
This radiation is less energetic than the former because it has a longer wavelength.
Learn more: https://brainly.com/question/10038290
What is the speed of a helicopter at the traveled 1200 miles in 7 hours
Answer:
171
Explanation:
What electrical energy converted inside a toaster?
Choices:
A. thermal energy and light
B. nuclear energy
C. chemical energy
D. kinetic energy
FOR BRAIN
Answer:
A. Thermal enerfy and light
Explanation:
Answer:
A
Hopefully this helped! :D
-LavenderVye
29. Which of the following is not a physical change?"
A) iron melting
B)food rotting
C)breaking a glass
D)shredding paper
Answer:
B food rotting
Explanation:
Food rotting is chemical change
How many scientists have an element named after them?
75
35
5
15
Answer:
15
Explanation:
Answer: 15 people
Explanation:
why do particles in a matter vibrate/move?
Answer:
Explanation:
force
Answer:
energy!!
Explanation:
Helium is an unreactive gas and neon is a gas of extremely low reactivity.what if anything do their atom have in common?
Answer:
It belongs to the last group with all the gas whose last shell are common and they are unreactive unlike to other elements which reacts to complete there last shell with total 8 electrons . Helium and Neon have in common that they have there shell complete and they reacts very less or they don't.
Explanation:
Hope it is helpful....
Considering the activity series given for nonmetals, what is the result of the below reaction? Use the activity series provided. F > Cl > Br > I Br2 + NaF
Answer:
no reaction will occur.
Explanation:
The term ''activity series'' in chemistry is used to describe the series of metals and non metals arranged in an orderly manner of reactivity which is usually arranged from the most active elements to the least reactive elements.
So, from the question we are given that F > Cl > Br > I. This means that Fluorine, F is the most reactive element in this group of non metals[group seven in the periodic chart/table], while the least reactive element is the Iodine, I.
Hence, Cl, Br and I can not displace F in any chemical reaction since they are less reactive as compared to F.
Therefore, the reaction; Br2 + NaF will not occur because Bromine can not displace Fluorine. Fluorine is more reactive than Bromine
Answer:
A
Explanation:
EDGE
3 C₂ H₂
How many CzHg molecules are in the picture?
Answer:
i think it will 3 of each hope it helps. three molecules of each
Which element requires the least amount of energy to remove the most loosely held electron?
Р
CI
Ar
Na
Which element requires the least amount of energy to remove the most loosely held electron?
aanswer: bromine
what is ZnCl2 name and formula
Answer:
Zinc chloride is the name of chemical compounds with the formula ZnCl2 and its hydrates
How does Gregor Mendel's work with pea plants affect human life today?
O A. People continue to cross pea plants to fix Mendel's many experimental mistakes.
B. People use Mendel's knowledge of DNA and chromosomes to create new species.
O C. People use the strains of pea plants that Mendel developed as a major food source.
D. People continue to selectively breed plants and animals to produce predictable results.
Answer:
D. People continue to selectively breed plants and animals to produce predictable results.
Explanation:
Gregor Mendel's work with pea plants affect human life today as a result of his ability to produce different results and genetic composition of pea plants through his crossing methods.
This laid the foundation for people today to continue to selectively breed plants and animals to produce predictable results which has lots of advantages associated with it.
Using the mass of baking soda that you used this lab, calculate the theoretical (expected) yield of NaCH3COO in grams ?
Mass of baking soda - 4.5 g
Answer:
4.4 g
Explanation:
The equation of the reaction is;
NaHCO3 (aq) + CH3COOH (aq) ----> CO2 (g) + H2O (l) + CH3COONa (aq)
Mass of baking soda - 4.5 g
Molar mass of NaHCO3 = 84.007 g/mol
Number of moles of baking soda= 4.5 g/84.007 g/mol = 0.0536 moles
If 1 mole of NaHCO3 yields 1 mole of CH3COONa
0.0536 moles of NaHCO3 also yields 0.0536 moles moles of CH3COONa
Hence;
Theoretical yield of CH3COONa = 0.0536 moles * 82.0343 g/mol = 4.4 g
What mass of water would be produced if 1.5 g of ethanoic acid was reacted completely with sodium hydroxide (3 marks)
Mass of water : 0.45 g
Further explanationGiven
1.5 g ethanoic acid
Required
Mass of water
Solution
Reaction
CH₃COOH + NaOH ⇒H₂O + CH₃COONa
mol CH₃COOH(MW=60 g/mol) :
= mass : MW
= 1.5 : 60
= 0.025
mol H₂O from the equation :
= 0.025(mol ratio CH₃COOH : H₂O= 1 : 1)
Mass of water :
= mol x MW water
= 0.025 x 18 g/mol
= 0.45 g
Guys help me pls
Which of type of elements are mainly gases at room temperature, dull and
brittle with low melting points?
Which of the following characteristics indicates that an atom is unstable?
A. A full valence shell
B. Forming very strong bonds
C. Existing by itself
D. Low electronegativity
Forming very strong bonds indicates that an atom is unstable. Option B
Characteristics of an unstable atomForces binding it are unbalancedThe nucleus possesses an excess internal energy.It lacks a full valence shell due to lack of electronsPossession of high electronegativity, due to attraction of electrons.Forms electrostatic bonds; very strong bonds.Therefore, forming very strong bonds indicates that an atom is unstable. Option B
Learn more about unstable atoms here:
https://brainly.com/question/17425565
#SPJ1
how the word triads coined in chemistry by johann dobereiner??
Answer:
In the history of the periodic table, Döbereiner's triads were an early attempt to sort the elements into some logical order by their physical properties. In 1817, a letter reported Johann Wolfgang Döbereiner's observations of the alkaline earths; namely, that strontium had properties that were intermediate to those of calcium and barium.[1] By 1829, Döbereiner had found other groups of three elements (hence "triads") whose physical properties were similarly related.[2] He also noted that some quantifiable properties of elements (e.g. atomic weight and density) in a triad followed a trend whereby the value of the middle element in the triad would be exactly or nearly predicted by taking the arithmetic mean of values for that property of the other two elements.
