"General Review of the Ninth Grade Chemistry Volume 1" PPT Courseware 2

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"General Review of the Ninth Grade Chemistry Volume 1" PPT Courseware 2

1. The first group of multiple choice questions

1. Setting off fireworks and firecrackers not only pollutes the environment, but also often causes personal injuries. The icon that prohibits setting off firecrackers is ( )

A B C D

2. Doctors often recommend that patients with anemia take a drug whose main component is FeSO4. In FeSO4, the valence of iron is ( )

A. +1B. +2C. +3D. -2

3. The chemical properties of diamond and graphite are similar, but their physical properties are very different. The reason is ( )

A. The atoms that make them up are different in size

B. The number of atoms that make up them is different

C. Diamond and graphite are composed of different kinds of atoms

D. Diamond, graphite, and carbon atoms are arranged in different ways

4. Nitric oxide is an atmospheric pollutant in automobile exhaust. It is a colorless gas that is difficult to dissolve in water and is slightly denser than air. It can react quickly with oxygen in the air to form reddish-brown nitrogen dioxide. gas. The method that can be used to collect nitric oxide in the laboratory is ( )

A． Drainage and gas collection method B． Upward exhaust air collection method

C. Downward exhaust air collection method D. Upward exhaust air collection method or drainage air collection method

1. The second group of multiple choice questions

1. Which of the following phenomena in life are chemical changes ( )

A． The popsicle melts B. Wet clothes to dry

C. The porcelain bowl was broken D． fruit rot

2. Potassium ferrate (chemical formula: K2FeO4) is a new and efficient water treatment agent with functions of oxidation, adsorption, agglomeration, and sterilization. The valence of iron in potassium ferrate is ( )

A.+2　B　+6　C.+3　D.+4

3. Washing clothes with hard water wastes soap and cannot be washed clean. To soften hard water in daily life, the method that can be used is ( )

A. Boiling B. Stirring C. Adsorption D. Filtration

4. Which of the following reactions does not belong to slow oxidation ( )

A. Metal magnesium burns in the air B. Vinegar brewing

C.Human breathing D.The decomposition of farmyard manure

The first set of fill-in-the-blank questions

1. Fe2+, Fe3+ and Fe have the same number of protons.

2. Black powder is one of my country’s four great inventions. The explosion of black powder can be represented by the following formula: 2KNO3 +3C+S�K2S +N2 +3X, then the chemical formula of X is CO2. If you prepare Gunpowder, then the mass ratio of the three raw materials KNO3, C, and S is 101: 18: 16, so that the gunpowder can burn most fully.

We have the experimental device shown in the picture below. Please answer the questions:

3. The experimental device should be __________ before adding drugs.

4. A set of equipment that can be used to produce O2 in the laboratory is __________.

The chemical equation of the reaction for producing O2 using this device is __________.

The second set of fill-in-the-blank questions

1. The atomic structure diagram of a certain element is as shown on the right. The correct understanding of this element is ______

A. The number of protons in the nucleus of this element is 34

B. The element is a metallic element

C. The number of electrons in the outermost shell of the atom of this element is 2

D. This element is in the fourth period of the periodic table of elements.

Based on this answer the following questions:

2. The number of protons in the nucleus of atom A is ___________, and there are __________ electrons in the outermost electron shell. This kind of atom can easily __________ electrons to form ___________ ions;

3. The nuclear charge of B atom is ____________, and there are ____________ electrons on the second layer. This kind of atom can easily ___________ electrons to form ____________ ions.

4. The chemical formula of the compound formed by two elements, A and B, is ________.

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