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WorksheetsHoá 12 hk1
Total questions: 55
Worksheet time: 28mins
What is the formula for methyl acetate?
CH3COOCH3
CH3COOC2H5
CH3COOCH2CH3
HCOOCH3
Which food contains a lot of omega-6 fatty acids?
Animal fat such as pork, chicken, fish, etc.
Butter, cheese, milk, cream.
Vegetable oils such as sesame, soybean, sunflower.
Vinegar, pickles.
The name of the ester CH3COOC2H5 is:
Ethyl formate.
Ethyl acetate.
Methyl acetate.
Methyl formate.
Hydrolysis of ester X gives C4H8O2, and ethyl alcohol. The name of X is:
Methyl propionate.
Ethyl acetate.
Methyl acetate.
Propyl acetate.
In the food industry, the ester used to make butter flavor is CH3CH2COOC2H5. The name of X is:
Methyl propionate.
Ethyl propionate.
Methyl acetate.
Propyl acetate.
Which of the following can be used as a synthetic detergent?
CH3(CH2)10CH2OSO3Na
CH3(CH2)16COOK
CH3(CH2)10COONa
C21H35COONa
Soap has the main component:
Sodium or potassium salt of carboxylic acid.
Sodium or potassium salt of any acid.
Sodium or potassium salt of fatty acid.
Glycerol.
Detergent has the main component:
Sodium or potassium salt of carboxylic acid.
Sodium or potassium salt of any acid.
Sodium or potassium salt of fatty acid.
Glycerol.
What is the formula of the main component in soap?
Soap.
Synthetic detergent.
Natural detergent.
Vinegar.
Which statement is correct?
The salt has the formula C15H31COOK and is the main component of synthetic detergent.
After using detergent to wash greasy objects, detergent causes environmental pollution.
During the process of making soap, the salt is made from fat and KOH, and ethylene glycol is also produced.
In industry, soap is made from alkane obtained from petroleum.
Maltose is also called:
Grape sugar.
Malt sugar.
Cane sugar.
Beet sugar.
The structural formulas shown above are of α-glucose and β-glucose. The order is: (1) and (3), (2) and (4), (3) and (1), (4) and (2).
(1) and (3)
(2) and (4)
(3) and (1)
(4) and (2)
Which of the following is the structural formula of glucose?
CH2OH(CHOH)4CHO
CH2OH(CHOH)4COOH
CH2OHCHOHCHO
[C6H10O5]n
Which statement below correctly describes the chemical properties of glucose and fructose?
Glucose and fructose both have reducing properties.
Glucose and fructose both have open-chain structures.
Glucose and fructose both react with Cu(OH)2/OH to give a blue solution.
Glucose and fructose both do not react with bromine water.
Which of the following is a disaccharide?
Glucose
Saccharose
Starch
Cellulose
The following structural formula describes which carbohydrate?
Glucose
Fructose
Saccharose
Maltose
X is a substance in the main food of humans, and is the raw material for producing ethyl alcohol in industry. It is found in rice, corn, potatoes, etc. Substance X is:
Glucose
Saccharose
Starch
Cellulose
Which of the following substances, when dissolved in Cu(OH)2, gives a blue solution?
Fructose
Propyl alcohol
Albumin
Propan-1,3-diol
Which statement is correct?
Fructose and saccharose are distinguished by the silver mirror test.
Starch and cellulose are distinguished by iodine.
Saccharose and glycerol are distinguished by Cu(OH)2.
Maltose and saccharose are distinguished by the silver mirror test.
Each enzyme catalyzes only one specific biochemical reaction.
True
False
Enzymes are biological catalysts that help reactions occur much slower than chemical catalysts.
True
False
The substance CH3-CH(NH2)-CH2-COOH is known as:
3-aminobutanoic acid
β-aminobutyric acid
β-aminobutanoic acid
α-aminobutyric acid
A tripeptide is a compound that:
Has 2 peptide bonds and a molecule with 3 different α-amino acids.
Has peptide bonds and a molecule with 3 different amino acids.
Has peptide bonds and a molecule with 3 identical amino acids.
Of the following amines, which one always exists in a different state compared to the others?
trimethylamine
isopropylamine
butylamine
aniline
Which of the following statements about peptides and amino acids is correct? (1) In peptide chains, the first amino acid must have an NH2 group. (2) Glutamic acid is a neurotransmitter. (3) H2N-CH2-CO-NH-CH2-COOH is a dipeptide. (4) The bond formed between the NH group and the amino acid unit is called a peptide bond.
1, 2
2, 3
3
4
The substance that forms the main part of proteins is:
amino acid
fatty acid
various acids
base
The substance that does not belong to the group of simple proteins is:
ammonia
methyl amine
aniline
lysine
When boiling an egg in water, after boiling, the phenomenon that occurs is:
the egg white coagulates
the egg white dissolves in water
the egg white turns blue
the egg white turns green
Which of the following statements is NOT correct?
Composite materials have good insulation and heat resistance.
Terylene is made by polycondensation.
Poly(methyl methacrylate) is transparent and transmits light.
PVC is a shaped plastic.
Glue with high viscosity is made by mixing starch with water.
The average molecular weight of natural rubber and plexiglass is 36720 and 47300, respectively. The number of repeating units in each polymer is:
540 and 550
540 and 473
680 and 473
680 and 550
Which polymer is used to make flexible plastic?
Nylon-6
Nylon-6,6
Amylose
Polyethylene
Which statement is correct?
Butadiene-1,3 reacts with acrylonitrile in the presence of Na catalyst to produce buna-N.
Terylene is a copolymer.
Formaldehyde is used to produce poly(phenol formaldehyde).
Poly(ethylene terephthalate) is produced by polycondensation of corresponding monomers.
The process of combining many monomers to form a polymer, with the elimination of small molecules (such as H2O), is called:
addition
substitution
cleavage
condensation
The process of vulcanization of rubber belongs to which type of reaction?
chain scission
chain extension
keeping the polymer chain intact
polymer degradation
The following symbols are the recycling codes for 6 common thermoplastic polymers. Which polymer is represented by code 5?
A. CH2=CH2
B. CH2=CH-CH3
C. CH2=CH-C6H5
D. CH2=CH-Cl
Nhận xét nào sau đây đúng về quá trình điện phân ở hai điện cực?
Cation nhường electron ở cathode.
Anion nhận electron ở anode.
Sự oxi hóa xảy ra ở anode.
Sự oxi hóa xảy ra ở cathode.
Câu 36. Điện phân dung dịch CuSO4 với hai điện cực trơ. Sau một thời gian, màu xanh của dung dịch nhạt dần. Nguyên nhân là:
khí H2 sinh ra do khử mâu của dung dịch.
dung dịch bị pha loãng dần nên màu xanh nhạt dần.
ion Cu2+ bị khử dần thành Cu kim loại.
ion Cu2+ bị khử dần thành Cu kim loại do thêm.
Cho bảng giá trị thế điện cực chuẩn của các cặp oxi hóa - khử: Thế điện cực chuẩn (V) của pin điện hóa gồm hai điện cực Ag+/Ag và Ni2+/Ni với cặp oxi hóa - khử:
K+/K
Ni2+/Ni
Ag+/Ag
Ag+/K+
Sức điện động chuẩn của pin điện hóa gồm hai điện cực chuẩn của các cặp oxi hóa - khử sau:
0,799 V
0,257 V
2,356 V
0,146 V
Phản ứng hóa học chính xảy ra trong quá trình điện phân nóng chảy Al2O3:
2Al2O3 → 4Al + 3O2
2AlF3 → 2Al + 3F2
2NaF → Na + F2
2H2O → 2H2 + O2
Cho biết giá trị thế điện cực chuẩn của các cặp oxi hóa - khử sau: Cu2+/Cu: 0,340, Zn2+/Zn: -0,763, Mg2+/Mg: -2,356, Al3+/Al: -1,676, Ni2+/Ni: -0,257. Số kim loại trong dãy gồm: Mg, Al, Zn và Ni có thể khử được ion Cr3+ (aq) tạo ra Cr2+ (aq) ở điều kiện chuẩn là:
3
1
4
2
Trong công nghiệp, việc tinh chế đồng từ đồng thô được thực hiện bằng phương pháp điện phân dung dịch anode làm bằng:
vàng
graphite
đồng thô
platinum
Trong pin điện hóa, điện cực dương là:
dương
cathode
ion âm
anode
Ion nào sau đây có tính oxi hóa mạnh nhất?
Fe3+
Mg2+
Ag+
Cu2+
Điện phân là quá trình:
cation
phân li các chất
phân hủy các chất bằng dòng điện
oxi hóa - khử
Trong quá trình điện phân, cực dương được gọi là:
cation
cathode
electrolyte
anode
Khi điện phân nóng chảy Al2O3:
tại cực âm xảy ra quá trình khử Al3+
tại cực âm xảy ra quá trình oxi hóa O2-
tại cực dương xảy ra quá trình oxi hóa Al3+
tại cực dương xảy ra quá trình khử O2-
Khi điện phân dung dịch CuSO4 bằng điện cực trơ. Đồ thị nào sau đây biểu diễn sự thay đổi khối lượng anode theo thời gian?
A. [Graph A]
B. [Graph B]
C. [Graph C]
D. [Graph D]
What happens at the anode in a Galvanic cell?
Oxidation occurs
Reduction occurs
Cathode is the anode
Anode is the cathode
In the following electrochemical cell, which process occurs at the anode?
Oxidation
Reduction
Cathode is the anode
Anode is the cathode
In the following list of batteries, which one is a standard battery?
Pin Zn - Pb
Pin Zn - Cu
Pin Pb - Cu
Pin Al - Zn
In the electrolysis of NaCl solution, what process occurs at the anode?
Oxidation of Na+
Oxidation of Cl-
Reduction of H2O
Oxidation of Cr-
In the experiment of electrolysis of copper(II) sulfate solution with graphite electrodes, which statement is NOT correct?
At the anode, oxygen gas is released.
At the cathode, a brown-orange substance is deposited.
The equation for the electrolysis of copper(II) sulfate: 2CuSO4 + 2H2O → 2Cu + O2 + 2H2SO4
If the graphite electrodes are replaced with copper electrodes, the size of the anode increases.
In daily life, plastic bags for food are usually made from polyethylene (PE), while water pipes and electric wires are usually made from polyvinyl chloride (PVC). Which of the following statements is correct? Choose the correct statements.
PE has a repeating unit -CH2-CH2-.
Under normal conditions, both PE and PVC are solid, insoluble in water.
Both PE and PVC are made by polymerizing their respective monomers.
In waste treatment, burning PE and PVC produces CO2 and H2O, but burning PVC also produces toxic gases.
In daily life, which of the following products are made from nylon, plastic for food, tires, and synthetic rubber?
Plastic bags, plastic bottles, food containers, tires, synthetic rubber.
Tires, synthetic rubber, plastic bottles, food containers.
Tires, synthetic rubber, plastic bags, food containers.
All of the above.
