"General Review of Ninth Grade Chemistry Volume 1" PPT courseware 5

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"General Review of Ninth Grade Chemistry Volume 1" PPT courseware 5

There are currently five elements: H, C, O, S, and Cu. Please use one of the elements to write down a substance that meets the following requirements (expressed in chemical formula):

(1) What is used to make wires and cables is _______;

(2)The main component of natural gas is _______

(3) The gas that can form acid rain is _______;

(4)The most commonly used solvent in middle school chemistry laboratories is _______

(5) The salt that can dissolve in water to form a blue solution is _______

A student has the following understanding of the meaning of numbers in some scientific symbols, and the wrong one is (D)

A． O2: It can mean that there are 2 oxygen atoms in an oxygen molecule.

B． 2C: can represent two carbon atoms

C. S2-: It can mean that a sulfide ion carries 2 units of negative charge.

D. NH3: It can be judged that the number ratio of N and H elements in this substance is 1:3

On May 12, 2008, an earthquake occurred in Wenchuan, Sichuan Province. In order to prevent the emergence of post-disaster epidemics, epidemic prevention personnel use peracetic acid (C2H4O3) and sodium hypochlorite (NaClO) for disinfection. Which of the following statements is correct (C)

A． The valence of chlorine in sodium hypochlorite is -1

B． Sodium hypochlorite is an oxide

C. The relative molecular mass of peracetic acid is 76

D. The mass ratio of carbon, hydrogen, and oxygen elements in peracetic acid is 2:4:3

Para-phenylenediamine, a coloring agent commonly used in hair dyeing, is a toxic chemical that is carcinogenic and can cause harm to the body of hair dyers. Its chemical formula is C6H8N2. Which of the following statements about p-phenylenediamine is correct (AD)

(A) P-phenylenediamine is an organic substance

(B) The relative molecular mass of p-phenylenediamine is 27

(C) The mass ratio of carbon, hydrogen and nitrogen elements in p-phenylenediamine is 3:4:1

(D) p-phenylenediamine can be absorbed by the human body in small amounts

Metals are closely related to human life. Please analyze and answer the following questions:

(1) Carve a brass sheet and a pure copper sheet against each other and find that deep scratches are left on the surface of the pure copper sheet. The relationship between their hardness is:

Brass ___>___Pure copper (fill in “＞”, “＜” or “=");

(2) Aluminum products have good corrosion resistance, the reason is (expressed by chemical equation);

(3) Add a certain amount of mixed powder of zinc and copper to the AgNO3 solution. After full reaction, filter it. The filtrate is blue, then the metal ions contained in the filtrate are Zn2+, Cu2+ and Ag +, Cu2+, Zn2+ (write down all possible combinations that exist).

Place a beaker of equal mass on each side of the leveled pallet balance. Pour dilute sulfuric acid with equal mass and equal mass fraction into each beaker. Then put a certain mass of metal X powder into the beaker on the left side. At the same time, put metal Y powder with the same mass as X into the beaker on the right pan. Observe that the pointer of the balance first moves to the left. When the two metals are completely dissolved, the pointer of the balance moves to the right. Then X and Y are (D) in the following combinations

A B C D

X Mg Zn Zn Fe

Y Fe Mg Fe Zn

Determine whether the following reactions occur.

Zn+H2SO4 Cu+HCl Ag+H2SO4 Fe+HCl

Cu+FeSO4 Zn+FeCl2 Cu+Ag(NO3)2 Al+MgCl2

Determine whether the following substances can be produced by the reaction between metals and acids.

ZnSO4 CuCl2 FeCl2 Fe2(SO4)3 MgCl2 Al2(SO4)3 HgSO4

Insert four zinc rods into the following four solutions respectively, and take them out after a period of time. The mass of the solution increases by __A_C__, and the mass of the solution decreases by ___D___. The mass of the solution does not change _B____

A, H2SO4 B, MgSO4 C, CuSO4 D, AgNO3

A mixture of three metals, Mg, Fe, and Cu, reacts completely with an appropriate amount of dilute sulfuric acid. The residue on the filter paper after filtration contains __Cu__, and the cations in the filtrate include Mg2+ and Fe2+. If excess zinc powder is added to the filtrate, the reaction will be complete. After filtering, the substances on the filter paper are __Zn, __Fe_, and the solutes in the filtrate are __magnesium sulfate and zinc sulfate______.

An extracurricular interest group analyzed a batch of iron samples (which contained impurities that were insoluble in water and did not react with dilute sulfuric acid). Three students, A, B, and C, conducted experiments respectively. Only one student used the dilute sample. Sulfuric acid reacts completely with the iron sample. The experimental data is as follows:

A B C

Beaker + dilute sulfuric acid 200g 150g 150g

Iron sample added 9g 9g 14g

After full reaction,

Beaker+remainder 208.7g 158.7g 163.7g

Please analyze the data carefully and answer the following questions:

(1) Which student took the dilute sulfuric acid and the iron sample that reacted completely; B

(2) Calculate the mass fraction of iron in the sample;

(3) Calculate the mass of the solute in the solution obtained exactly after complete reaction. (The mass of the beaker is 25.4g)

In order to keep the food in the bag from getting wet, current food manufacturers will put a small bag of desiccant inside the bag to keep the food dry. There is a bag of "Wangwang Snow Cake" desiccant on the experimental table that has been exposed for a long time. Its description is as follows:

Please ask students, what questions or guesses can you ask when faced with the above instructions and the instructions for the desiccant?

Desiccant

Main ingredients: quicklime

Note: Do not enter

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