1. Possible relative atomic mass: H- 1 O- 16 S-32 Na-23.
45
A, multiple-choice questions (this question 20 small questions, each small question 2.5 points, ***50 points. There is only one option for each small question.
1. In the process of observing the object with a microscope, when the adjusting lens barrel descends, the part that the eyes want to see is ().
A, objective B, eyepiece C, reflector D, lens barrel
2. The tap water disinfected with chlorine contains hypochlorous acid (HClO), and the valence of chlorine is ().
a 、- 1 B 、+7 C 、+ 1 D 、+5
3. The football player kicks the football into the air. If the air resistance is not counted, the correct one is ().
The final of the first and second place will be held in Berlin (East Zone 1) at 9: 00 local time on July 9/KLOC-0. When should we (East 8) watch the live broadcast on time ()?
A, July10/2: 00 b, July 9 at 02: 00 c, July 9 at 12: 00 d, July10 at 02: 00.
5. A classmate's experimental record has the following data. What is unreasonable is ()
A, the pH value of a solution is 8. 1 B measured by pH test paper, and 5.4g NaCl is weighed by tray balance.
C, measure 7.4ml of hydrochloric acid D with a measuring cylinder, and the mass fraction of solute in physiological saline is 0.9%.
6. Figure 2 is an experimental device for producing oxygen from hydrogen peroxide. The correct statement is ().
a、①④ B、②③ C、③④ D、①③
7. The following statement is incorrect ()
A, H2, H2O, H2SO4, hydrogen-containing molecule B, water is both an oxide and a pure substance, or a compound.
C sodium carbonate d mixed in salt can be removed by hydrochloric acid, and the metathesis reaction will not produce simple substance.
8. Figure 3 is a model of chemical reaction, and the following reaction type is correct ()
A, metathesis reaction b, combination reaction
C, decomposition reaction D, displacement reaction
9. The following common sense about household electricity is correct ()
A, the metal shell of household appliances need not be grounded. B, standing on a dry wooden bench and disconnecting two wires at the same time won't get an electric shock.
C, found someone get an electric shock, should cut off the power supply as soon as possible d, wet hands can directly switch electrical appliances.
10. On the summer solstice, the sun shines directly on the Tropic of Cancer. On this day, the direction of the shadow of the flagpole at noon in a school playground in Shenzhen (22.5 N) is ().
A, due south b, due north c, southeast d, southwest
1 1. Figure 4 is about several optical paths of the lens, and the correct one is ().
12. The public security department stipulates that neither the driver nor the passenger sitting in the front of the car should wear a seat belt on his chest, mainly to reduce the personal injury that may be caused under any of the following circumstances ().
A, emergency braking B, sudden start C, too fast D, too slow.
13. The following statement about the function of digestive system is incorrect.
A. bile secreted by liver function can promote digestion. B. The large intestine has the function of digestion and absorption.
C, chewing teeth is also a kind of digestion D, the small intestine has a strong digestion and absorption function.
14. Which curve on the right can represent the growth and development process of human reproductive organs (D)
15. Avian influenza is an infectious disease. Heart disease is not an infectious disease. This is because ()
A, heart disease cannot be prevented by vaccine B, bird flu is not caused by pathogens.
C, bird flu has no source of infection D, heart disease has a certain route of transmission.
16. In production and life, when fixing the workpiece with screws, it is necessary to put a big washer under the nut. The purpose of this is ().
A, increase the friction between the nut and the workpiece b, and reduce the pressure of the nut on the workpiece.
C, reduce the pressure of the nut on the workpiece d, play a decorative role, and make the workpiece more beautiful.
17. Four students from the science interest group exchanged their learning experiences. What they said is incorrect ().
A. The state of reactants and reaction conditions should be considered when designing the gas generating device. B, dry ice absorbs heat through decomposition reaction and is used to refrigerate food.
C, dilute hydrochloric acid can be used to clean the rust d at the rail joint to be welded, and concentrated sulfuric acid can be used to absorb the water vapor contained in carbon dioxide gas.
L8。 About electromagnet, the following statement is correct ().
A, the magnetic strength of electric broken iron has nothing to do with the strength of current passing through it. B, the direction of the current in the electric broken iron changes, and its magnetic field strength also changes.
C, the same energized solenoid, copper core is weaker than iron core. D, electromagnet magnetic field strength has nothing to do with the number of coil turns.
19. Which of the following is not a factor that affects human health and threatens human life ()
A, infectious diseases caused by bacterial virus infection B, seasonal alternation. The climate is obviously different.
C. Non-communicable diseases such as cancer and cardiovascular diseases D. Accidents such as car accidents, mine accidents and earthquakes.
20. A classmate got the following information from Figure 6, of which the correct one is ().
A, when it rains, the rain will gather in B.
B, among a, b and c, c is the closest to the cliff.
C, to climb to the top of the mountain A, it is the easiest to climb from D.
D. the relative height of b and d in the picture is 200 meters.
Fill in the blanks and answer short answers (7 small questions in this question, 65438+ 0 points in each box, ***22 points)
2 1. Since the summer of this year, it has been raining continuously in Shenzhen, and the rainfall has increased significantly year-on-year. This is because Shenzhen is under _ _ _ _ _ _ air pressure control; Indoor walls often "sweat" in rainy days, which belongs to the phenomenon of _ _ _ _ _ _ _ _ _ in the change of things' state; Rainfall seriously affected the _ _ _ _ _ _ _ _ _ of litchi tree flowers, reduced the fruit setting rate, and caused a significant reduction in litchi production in Shenzhen.
22. Figure 7 shows an airplane refueling in the air. When the receiver speed is 1000km/h, the tanker speeds with the ground and the receiver as parameters are _ _ _ _ _ _ _ _ _ and _ _ _ _ _ _ _ _ _ _ _ respectively.
23. As shown in Figure 8, three drops of sodium hydroxide, three drops of potassium hydroxide, three drops of calcium hydroxide and three drops of sodium carbonate were rounded into the four holes (numbers) of the drip plate of the experimental instrument, and then 1 drop of purple litmus test solution was added, and it was observed that all four solutions turned blue.
(1) This experiment shows that these four solutions are all _ _ _ _ _ _ _, and their pH values are all _ _ _ _ 7 (fill in "
(2) According to the phenomenon of this experiment, you can still draw such a conclusion: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
24. As shown in Figure 9, the lamp L is marked with the words "6V 3W". When the switch S is closed and the slider P moves to the A end, the indicator of the ammeter is 0.6A, and the lamp L emits light normally. Then the work done by the current flowing through L every minute is _ _ _ _ _ _ J. The maximum resistance of the sliding rheostat is _ _ _ _ _ _ _ Ω.
25. Figure 10 is a schematic diagram of human blood circulation:
(1) After blood flows from A into the lungs, the content of _ _ _ _ _ _ _ increases. ..
(2) After opening _ _ _ _ _ _ _ _ _, blood flows from the right atrium to the right ventricle.
(3) From the function of tissues and organs, the content of _ _ _ _ _ _ _ _ _ _ _ _ _ increased after blood flowed out from B through the pituitary gland. ..
(4) The blood flowing from the tissues and organs to the right atrium is a part of _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Read the map 1 1 "Map of Antarctica" and complete the following requirements:
(1) Mark the rotation direction of the earth at the dotted line in the figure.
(2) Write down the longitude _ _ _ _ _ _ _ _ _ _ of point A at the Great Wall Station in Antarctica.
(3) In A, B, C and C, it is _ _ _ _ _ _ _.
27. In science, the intensity of photosynthesis (represented by CO2 absorption) minus the intensity of respiration (represented by CO2 release) is often used to explain the amount of organic matter accumulated by plants. Figure 12 is a graph of CO2 absorption or release by cotton in different periods on sunny days. The answers are as follows:
Figure 12
(1) The intensity of photosynthesis can be expressed by the absorption of CO2, because CO2 is _ _ _ _ _ _ _ _ _ _ _.
(2) There are _ _ _ _ _ _ _ _ _ periods in the picture when the intensity of photosynthesis increases.
(3) Before 6 o'clock in the morning, cotton releases CO2 instead of absorbing CO2, that is, _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.
(4) On this day, the time for cotton to accumulate the most organic matter is _ _ _ _ _ _.
Three, comprehensive, calculation questions (this title is 4 small questions, ***28 points)
28.(8 points) Titanium (Ti) is an important aerospace metal material. Xiao Ming and Xiao Qiang went to the laboratory to explore its metal activity. They found four kinds of polished magnesium, aluminum, copper and titanium with the same mass, as well as dilute sulfuric acid and dilute hydrochloric acid with the mass fraction of 10%.
(1) in order to explore the activity of titanium in these four metals, your hypothesis is
______________________________________________________________________________。
(2) According to the hypothesis, they designed the following experiments respectively:
1. Xiao Qiang first put magnesium tablets and titanium tablets into 200 grams of dilute hydrochloric acid with a mass fraction of 10%; Then the aluminum sheet and the copper sheet were put into 200 grams of dilute sulfuric acid with a mass fraction of 65438 00% respectively.
The defects in Xiao Qiang's experimental design are _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Ⅱ. Xiaoming chooses four pieces of metal with the same mass and puts them into 200g of dilute sulfuric acid with the mass fraction of 10% respectively. The observed experimental phenomena are as follows:
Metal titanium magnesium aluminum copper
There are bubbles, but the reaction is slow and a lot of bubbles are produced. The reaction is very intense and there are many bubbles. The reaction is more intense and no bubbles are generated, and there is no obvious phenomenon.
According to Xiao Ming's experimental phenomenon, it is pointed out that the activity of four metals is from strong to weak (represented by element symbols)
__________________________________________________________________________。
(3) Write a familiar chemical equation related to the experiment.
_________________________________________________________________________。
29.(8 points) The long-awaited main project of Shenzhen Bay Highway Bridge of Shenzhen-Hong Kong Western Corridor was officially completed in June 5438+10, and will be put into use this year (assuming the deck is straight).
(1) Is the pier supporting the bridge floating by water? _____________________。
(2) The hull height of ocean-going freighter can just cross Humen Bridge in the Pearl River. Can I cross the Shenzhen Bay Highway Bridge? (Assuming that the height from the water surface of the two bridges to the bottom of the bridge deck is the same) _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.
(3) If the car with 80km/h runs on the bridge deck at a constant speed after the bridge is opened to traffic, it will take 15 minutes to pass. How long is this bridge?
(4) If the weight of the car is 3.6× 104N and the resistance of the car is 0.2 times of the weight of the car, how much work has been done to find the traction of the car?
30.(5 points) In the experiment of "measuring the power of small light bulb", some students found that the voltage appearance decreases when the light bulb is on, and increases when the light bulb is dark. After inspection, all the equipment used is in good condition.
(1) Do you think the circuit diagram in figure 13 is _ _ _ _ _ _ _ _ _?
Figure 13
(2) If the experiment is conducted according to the circuit connected by classmates, and the results of the two tables are as shown in Figure 14 (the movie voltage is known to be 6V), then the ammeter indicates _ _ _ _ _ _ _ _ _ _ _ _ _ _ A, and the voltmeter indicates _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ V；; The actual power measured by the light bulb is _ _ _ _ _ _ _ W.
Figure 14
3 1.(7 points) Shenzhen has a large population and is short of resources, and its per capita natural resources are far below the national average. At the beginning of the new year, the municipal party committee and the municipal government made a scientific decision to develop circular economy and build an eco-city. Circular economy is an ecological economy characterized by saving resources and recycling.
(1) The environmental resources needed by human life come from _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.
(2) Circular economy requires recycling solid waste and turning waste into treasure. The largest Yantian garbage power plant in Shenzhen uses garbage to generate electricity, which is to convert _ _ _ _ _ _ _ _ _ _ _ energy in garbage into electric energy.
(3) Circular economy requires harmless treatment of toxic emissions. SO2 can be absorbed by caustic soda (NaOH) solution scientifically, and its reaction equation is: SO2+2 NaOH = Na2SO3+H2O. According to the report of Shenzhen Special Zone Daily on March 24th this year, if all coal-fired power plants in Shenzhen realize the engineering desulfurization technology, the annual SO2 emission will be reduced by 1 120 tons.
(4) The three-dimensional ecological agriculture model of a courtyard in bright farm, Shenzhen, as shown in figure 15, in which vegetable leaves are fed to pigs, pig manure is used to make biogas, biogas slurry is used to irrigate vegetable fields, biogas residue is used to raise earthworms, earthworms raise chickens, and chicken manure is used to apply fruit trees.
From the perspective of energy flow, this model makes full use of _ _ _ _ _ _ _ _ in the ecosystem; From the point of view of material circulation, this model has greatly improved the recycling rate of _ _ _ _ _ _ _ _ in the agricultural ecosystem.
Zhu: Too many. I don't know the website.