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Answers to five questions in three exercises of chemistry in grade three.
Summary of teaching plan exercises in junior three subjects

China Mathematical English Physical Chemistry

20 10

20 1 1

Test questions of chemical quality and ability in the first semester of ninth grade

Fourth unit

The mystery of material composition

Reference answer

Title number

1

2

three

four

five

six

seven

eight

nine

10

1 1

12

13

14

15

answer

B

B

C

B

C

C

A

B

D

C

D

C

B

C

A

16

(1) molecules and atoms

(2), molecules and atoms

(3) atoms

(4) Protons and nuclei

(5), electronic

Six molecules,

Atoms and neutrons

All landowners, electronics

(8) Nuclei (or protons and neutrons)

17

Both contain oxygen atoms; Different molecular compositions

18

、①、

②、

Continuing education (UK)

2

(So

four

)

three

③、

magnesium

2+

④、

3Al

⑤、

4Cl

-

5H

2

O

19

、①、

10

neon

②、

12

magnesium

2+

③、

eight

O

2-

20

1.UDMH consists of three elements: carbon, hydrogen and nitrogen;

② A unsymmetrical dimethylhydrazine molecule consists of two carbon atoms, eight hydrogen atoms and two nitrogen atoms;

2 1

(

1

)

16

seven

; Fluorine (

2

)

magnesium

2+

, neon;

(

three

) The number of outermost electrons in the same row (or column) increases in turn.

The outermost electron number is the same)

(Other answers are reasonable. )

22

(

1

)

+5

(

2

)

23

24

(

three

)

200 grams

×

0.76

19/ 144

×

100

%=

0.2g

Yuechi county chengguan high school

20 1 1

High school chemistry unit 1 and unit 2 comprehensive examination questions

Reference answer

First, multiple-choice questions (each

2

Points, * * * *

40

Integral)

1

2

three

four

five

six

seven

eight

nine

10

C

D

D

B

D

B

B

B

A

B

1 1

12

13

14

15

16

17

18

19

20

A

C

D

B

A

C

D

C

A

D

two

.

Fill in the blanks (each text expression

2

Point, the rest are empty.

1

Points, * * * *

4 1

Integral)

2 1.F

C

D

D

A

22.

Carbon dioxide, nitrogen, water vapor, oxygen

23.

Jar, medicine spoon, tweezers; Flask, dropper, measuring cylinder;

1

2

Cover the bottom of the test tube.

24.

④⑦,⑤⑥

25.

① Hydrogen peroxide, manganese dioxide, water, oxygen, sulfur and sulfur dioxide

Catalyze, decompose

Combination.

26. Nitrogen, iron, copper, potassium, phosphorus and calcium

2

Commander (commanding officer)

2

H

2

O

three

.

Experiment and explore questions (each blank)

1

Points, * * * *

19

Integral)

27.

(1) Test tubes, alcohol lamps, gas cylinders and water tanks.

A

Prevent potassium permanganate powder from entering respiratory tract.

B

, manganese dioxide, no heating, simple operation, etc.

C

or

D

Oxygen is not soluble in water or the density of oxygen is slightly higher than that of air, which is released continuously and evenly, causing the test tube to burst; will

The wooden strips with sparks extend all the way to the bottle mouth. If the wood is rekindled, it proves that all oxygen has been collected.

A

C

28.

(1) temperature, catalyst

(2) The higher the concentration, the faster the decomposition rate of hydrogen peroxide (or the higher the temperature, the faster the decomposition rate of hydrogen peroxide; use

Catalyst, the faster the decomposition rate of hydrogen peroxide)

20 10

~

20 1 1

study

year

degree

collect

undoubted

sequence

one

middle

study

nine

year

level

change

study

single

Yuan dynasty (1206- 1368)

measure

attempt

line

word

sequence

one

single

Yuan dynasty (1206- 1368)

go to

enter

change

study

produce

boundary

Reference answer

15

Don't touch drugs with your hands.

Don't taste any medicine.

16

External flame

Inner flame

, flame center

. External flame

17

Plain.

The lowest point of concave liquid level

small

18

, left disk

Right disk

tweezers

19

Turn it upside down.

control

20

、(

1

)

E

(

2

)

C

(

three

)

ab blood type

(

four

)

G

(

five

)

H

(

six

)

F

(

seven

)

D

(

eight

)

B

2 1

、(

1

) beaker (

2

) test tube (

three

) evaporating dish

22

23

When that liquid in the measure cylinder approaches the scale line,

Suck the liquid with a dropper and add it to the balance:

When reading, the measuring cylinder is placed smoothly.

Make it look like

The line is flush with the lowest part of the concave surface of the liquid level.

Place the test tube horizontally,

Then take out the massive solid with tweezers and put it at the mouth of the test tube.

Then slowly erect the test tube,

Let the solid slide slowly

The bottom of a test tube.

24

1

2

three

four

five

six

seven

eight

nine

10

1 1

12

13

14

C

C

B

D

D

D

D

B

B

B

B

C

C

C

25

(

1

)⑥

(

2

)

spirit lamp

beaker

(

three

) evaporating dish

(

four

) No.

26

27

, carbon

+

oxygen

======

carbon dioxide

The external flame contacts the air (oxygen) more fully.

Inner flame

a

alcohol concentration

Expose the wick length of alcohol lamp (score all other reasonable answers)

Chong Qing Fengmingshan Middle School

20 10-20 1 1

Ninth grade chemistry school year

First unit

Entering the world of chemistry "

unit testing

First unit

Entering the world of chemistry "

Unit test answer

First, multiple-choice questions:

(There is only one correct answer to each question, * * *)

30

Integral)

Title number

1

2

three

four

five

six

seven

eight

nine

10

1 1

12

13

14

15

answer

D

D

C

B

B

B

A

C

B

C

D

A

A

C

A

Second,

Fill in the question:

(every empty

1

Points, * * * *

15

Integral)

16

Oxygen can supply breathing and support combustion, but inhaling too much oxygen can cause poisoning; Chemical fertilizer can increase the yield of crops, but it will cause soil.

The pollution of soil and water is harmful to human health and so on.

Use less fossil fuels such as coal, oil and natural gas, and use more clean energy such as solar energy, wind energy and geothermal energy; Vigorously plant trees and prohibit indiscriminate logging.

Deforestation.

17

、?

18

、?

Medicine spoon

Check air tightness

fail

Wet rag or sand

You shouldn't fight in the lab; You can't eat food (or taste medicine) in the laboratory.

; Do not directly heat the test tube by hand; You can't put the beaker

Put it directly on the alcohol lamp to heat energy; Can't directly pour waste liquid into the pool; Use a tube clamp, and don't press your hand on the short handle.

Third, I will explore (

25

Integral)

19

experimental procedure

Verification basis

1

. use

row

water

Methods Two bottles of exhaled gas were collected, and the other two bottles were collected.

A bottle of air.

2

Drop clear water into exhaled gas and air respectively.

In a gas container.

according to

Stoneboog

ash

water

muddy

disordered/chaotic/confused

travel

degree

no

the same

, judging carbon dioxide

The content is different.

three

Put fuel rod into exhaled gas and air respectively.

In a gas container.

According to the different combustion conditions of wood strips, the oxygen content is also different.

four

Take two pieces of dry glass and exhale into one of them.

according to

According to the different judgment of water mist on glass sheet, the water content is different.

Judging water content

The quantity is different.

light

20

, Jiang

Comparison project

Experimental operation

Experimental phenomenon

come to a conclusion

carbon dioxide content

quantity

Drop clear limewater into the container respectively.

There is morning air and sunshine.

In the air container.

Lime water is obvious in the early morning air.

Become turbid,

Stones in the air after sunlight.

There is no obvious change in grey water.

Carbon dioxide in the air in the morning

Compared with the air after sunshine.

Zhonggeng

many

oxygen content

Put the fuel rod into the container separately.

There is morning air and sunshine.

In the air container.

In the early morning air

The slats soon went out.

Extinguish,

Wood that burns in the air after sunlight.

Burning more vigorously.

Oxygen content in the air in the morning

Than in the air after sunlight.

Very few

2 1

、?

Fill in the form:

Experimental operation

Experimental phenomenon

Experimental conclusion

Take a candle and cut a small piece with a knife.

Put it in the water

paraffin

Floating on the water.

Paraffin wax is denser than water.

Small.

Light candles,

Put a match on the candle.

In the flame

1

Take it out and observe.

Matchstick

both ends

Carbonization first.

Candle flame

External flame

The layer temperature is the highest.

Cover the candle flame with a dry beaker.

Above,

After a while, take off the beaker.

rapidly

Pour a small amount of clear limewater into the beaker and shake.

Swing.

The inner wall of beaker appears

Water mist, clarified limewater

Become turbid.

Paraffin wax is produced by combustion.

water

and

dioxide

Carbon.

C

low temperature

guess

phenomenon

Suppose 1

The gas in the center of the flame is carbon monoxide.

The mouth of the catheter can be ignited, the towel can be opened, and there is no paraffin solid in the catheter.

Hypothesis ②

The gas in the center of the flame is paraffin vapor.

The catheter won't ignite. Open the towel. There are paraffin solids in the catheter.

Assumption ③

The gas in the center of the flame contains paraffin vapor and carbon monoxide.

The mouth of the catheter can be ignited, the towel can be opened, and there is paraffin solid in the catheter.

Unit 1 of ninth grade chemistry in Dunhuang No.3 Middle School.

Unit 1 of ninth grade chemistry in Dunhuang No.3 Middle School.

Reference answer

1.

C

2.

C

3.

B

4.

C

5.

A

6.

C

7.

D

8.

B

9.

D

10.

C

1 1.

B

12.

C

13.

B

14.

A

15.

B

16.

form

structure

nature

Change rules

17.

corrode

poison

hand

smell

taste

18.

A.

table balance

B.

tweezers

D.

Something that drips

E.

Medicine spoon

E

C

D

A

19.

① Fine-necked bottle

turn upside down

Lean on the palm of your hand

approach

② Flat

The lowest point of concave liquid level

(3) condensed into water droplets.

Run down in a stream.

20.

(

1

) beaker; Glass rod.

(

2

) right; Glassware (or small beaker or watch mirror)

(

three

) flat; too large

2 1.

(

1

) beaker

test tube clamp

measuring cylinder

Alcohol lamp (

2

)①

A

D

B

C

22.

(

1

) The test tube is upright.

(

2

) The label is facing down.

(

three

) test tube mouth and reagent bottle mouth leave (

four

) The cork is on the table.

23.

(

1

) too hard when scrubbing the test tube.

(

2

) When heated with an alcohol lamp, the test tube is in contact with the wick.

(

three

) heating

There is water on the outer wall of the test tube.

(

four

)

Rinse the hot test tube with cold water immediately.

(

five

)

The test tube was not preheated when it was heated.

(

six

)

When taking APIs, the test tube should be placed vertically (just answer four points)

24.

Experimental phenomenon

conclusion

steam

hot

More carbon dioxide

22

Water can't completely enter an empty cup.

There is another way to prove that the empty cup is full of air, and the operation method and phenomenon are reasonable, that is

can

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