九年级上英语月考遣词造句

Project four chemical calculation

Measurement and control the navigation table

knowledge

Qid and difficulty level

According to the chemical formula calculation

1,3,4,7,9

Calculation of solution

2,

About the calculation of chemical equation

5 or 6 (difficult), 10, 12 (in)

About the chemical formula, the calculation of solution

8

About the calculation of the chemical equation, solution

13 (middle), 14 (c)

A, multiple choice

1. Quanzhou of fujian (2011) according to the chemical formula of alcohol "C2H6O" of the relevant calculation, error is (B)

A. the relative molecular mass of alcohol is 46

B. alcohol, carbon mass fraction is 26.1%

C. alcohol molecules, carbon, hydrogen, oxygen atom number 2:6:1

D. the quality of carbon, hydrogen, two kinds of elements in alcohol than 4:1

Analytic: the relative molecular mass of alcohol for 12 * 2 + 1 * 6 + 16 = 46, A correct; Carbon mass fraction is: x 100% = 52.2%, B error; Number of carbon, hydrogen, and oxygen atoms in alcohol molecule ratio of 2, 6, 1, C correctly; Alcohol quality ratio of carbon, hydrogen element in x 2 (12) : (1) 6) = 4:1, D is correct.

2. (guangdong guangzhou 2011) add 12.5 g to 100 g 10% NaOH solution NaOH solid, after completely dissolved, the solute quality mark in the solution to (B)

12.5% 12.5% a. b. c. d. 22.5% 25%

Analytic: * 100% = 20%.

3. (2010), zhenjiang city, jiangsu province known NH4NO3 and KH2PO4 solid mixture of nitrogen mass fraction is 28%, the mixture of KH2PO4 quality score for (A)

20% 20% a. b. c. d. 85% 80%

Analytic: in the solid mixture, only NH4NO3 contain nitrogen, pure nitrogen mass fraction in the NH4NO3 as: x 100% = 35%, the mixture of NH4NO3 as follows: the purity of 28% present 35% = 80%, the mixture of KH2PO4 quality score is: 1-80% = 20%.

4. (hunan zhuzhou 2011 was based on a certain quality of a material sufficient combustion, consumes 64 g O2, at the same time generate only 44 g CO2 and H2O, 36 g, (B) in the material

A. only carbon element

B. only contains two elements carbon and hydrogen

C. containing carbon, hydrogen and oxygen

D. only contain hydrogen

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