Chemistry  test

Relative molecule mass:H=1,O=16,S=32,Na=23,K=39,Cl=35.5

Ⅰ. Choices: 17*3’=51’

1.In the following equations,which is redox reaction?     (     )

A.CaCO₃+2HCl===CaCl₂+CO₂↑+H₂O    B.CaO+H₂O===Ca(OH)₂ 

C.2KMnO₄===K₂MnO₄+MnO₂+O₂↑       D. CaCO₃ === CaO+CO₂↑

2.In the following reactions,hydrochloric acid is oxidant in (   ),hydrochloric acid is reductant in (     )

A.NaOH+HCl===NaCl+H₂O           B.Zn+2HCl===ZnCl₂+H₂↑

C.MnO₂+4HCl===MnCl₂+2H₂O+Cl₂↑       D.CuO+2HCl===CuCl₂+H₂O  

3.Hydrochloric acid reacts with iron nails,hydrochloric acid is (    )

A.an oxidant   B.a reductant   C.oxidized  D.reduced

4.According to the valence of S in the following substances, which is wrong? (    )

A.    H₂SO₄ has oxidizing property.  B. H₂SO₄ has reducing property

C. H₂S has oxidizing property    D. H₂S has reducing property

5.In manufacturing foam rubber,we use the following reaction to get oxygen:2H₂O₂===2H₂O+O₂↑, H₂O₂ and is                              (    )

A. an oxidant                         B. a reductant   

C.both an oxidant and a reductant

D.neither an oxidant nor a reductant

6.Prepare 2L 1.5mol/L of Na₂SO₄ solution,the mass of Na₂SO₄ solid we need is                                                            (     )

A.213g        B.284g        C.400g          D.426g

7.The ratio of the number of Cl^- in 0.5L 1 mol/L of FeCl₃ solution to 0.2L 1mol/L of KCl solution is                                     (     )

A.1:3       B.3:1       C.5:2          D.15:2

8.Pour water in 30ml 0.5mol/L of NaOH solution to 500ml,and the amount-of-substance concentration of NaOH is                  (     )

A.0.03mol/L    B.0.3 mol/L    C.0.05mol/L    D.0.04mol/L

9.  The number of protons is equal to the number of

A. neutrons      B. electrons     C. the sum of neutrons and electrons

10. The element is a kind of atoms which have the same number of

A. neutrons      B. electrons     C. protons    D. nucleus

11. When we want to get hydrogen in the lab, which of the following apparatus is not used?

     A. test-tube     B. alcohol burner  C. flume     D. gas jar

12. Which of the following substances is composed of hydrogen molecule?

     A. H₂SO₄      B. water         C. hydrogen   D. HCl

13. The outermost shell of X atom has 1 electron, Y has a valence of -2, the chemical formula composed of X and Y is

     A. XY₂        B. X₂Y          C. XY        D. X₆Y

14. 4g Oxygen can react with (    )g hydrogen.

     A. 1           B.0.5            C. 2          D. 4

15. In the following equation:     x C₂H₂ +  y O₂  ==  z CO₂ +  2H₂O

        The value of x, y and z in the balanced equation are

A.       2, 4 and 1.       B. 3, 8 and 2.       C.  2, 5 and 4.     D.   2, 3 and 4.

16．Fe.,Fe²⁺, Fe³⁺ have the same number of

     A. electrons     B. protons        C.neutrons     D.atoms

17.  Element X ( atomic number 11) combines with element Y ( atomic number 16) to form a compound Z. which of the following statements are not correct?

     A. Z is an ionic compound     B. the chemical formula of Z is X₂Y

     C. when X combines with Y, each atom of X loses one electron.

     D. Y is metal and X is nonmetal

Ⅱ. Fill in the blanks 23*1’=23’

1.In the chemical reaction,if valences of elements change back and forth in this reaction,there must be________ transfer,and this reaction belong to ________ reaction. The rise of valence of elements indicates this substance ________ its electrons, ________ reaction takes place,and this substance is  ________agent ;valances of elements down indicates this substance ________ its electrons, ________ reaction takes place,and this substance is ________ agent.

2.The equation of Al reacting with diluted sulfuric acid is ________ .In this reaction,Al ________electrons,valence of it ________ ,it is ________agent,and ________reaction takes place ;H₂SO₄ ionizes into H⁺ ________ electron,valence of it________, H₂SO₄ is ________agent, and ________ reaction takes place.

3.Some acids display diversified properties in reaction.For example, MnO₂+4HCl(conc.)===MnCl₂+2H₂O+ Cl₂↑ .In this reaction,HCl display acidity,and also has reducing property .Analyze the function of acid in the following reactions.

(1).NaOH + HCl===NaCl + H₂O,HCl________.

(2).C+2H₂SO₄(conc.) === CO₂+2SO₂+2H₂O, H₂SO₄________.

4. Work out the chemical formula of the following compounds:

 (1)  iron(11) chloride                 (2)  iron(ⅲ) oxide

 (3) carbon monoxide              (4) sodium sulphate

III. Experiment(11’)

1. To make hydrogen in the lab: (5 marks)

(1) reaction:

(2) the name of the apparatus with the arrow

(3) how to collect the hydrogen?

 
ⅣCalculation

1.. How can we identify copper and the mixture of Zinc copper? If you can ,please write down the chemical equation of the reaction!   (5’)

Burn 20ml H₂(S.T.P)in enough Cl₂ completely.Calculate(7’)

(1)The volume of Cl₂ consumed (S.T.P)

(2)Dissolve all formed HCl in 500ml water to get the solution which density is 1.06g/cm3.What is the amount-of-substance of concentration of HCl in this solution ?