Solve a few problems in junior high school chemistry! Hurry, hurry!! Fast!!

1) grams.

2) kilograms. 3)16000÷8=2000t

Agriculture: Rain can lead to soil acidification. The soil in southern China was originally mostly acidic, and then washed by acid rain, accelerated the acidification process.

After the experiment, scientists estimated that the area of soybean affected by acid rain in seven southern provinces of China reached 23.8 million mu, and the output was reduced by 200,000 tons, a reduction of about 6%, and an annual economic loss of 14 million yuan.

Forests: 280,000 hectares of forests in the Sichuan Basin, China's heavy acid rain areas, accounted for one-third of the total forest area, and 10,000 hectares of dead area, accounting for 6% of the forest area. In Guizhou Province, which has also been hit by acid rain, 140,000 hectares of forests have been affected, half the size of the Sichuan Basin.

Water: A pond was found in Nanshan and Jinyun Mountains in Chongqing, with a pH of , which is a small body of water that has been acidified, which is a warning. Fortunately, so far no large-scale water acidification has been found in China.

1） 10200g

2） 16kg

3） 2000t

1) Hazards to aquatic systems, affecting fish and other biomes, altering the cycle of nutrients and toxins, dissolving toxic metals into the water and entering the food chain, reducing species and productivity. (2) Harm to terrestrial ecosystems, mainly manifested in soil and plants. Effects on the soil include inhibition of the decomposition of organic matter and nitrogen fixation, leaching of nutrients such as calcium, magnesium, potassium, etc., and impoverishing the soil.

For plants, acid rain damages the new leaf buds, affecting their growth and development, and leading to the degradation of forest ecosystems. (3) Effects on the human body. First, heavy metals such as mercury and lead enter the human body through the food chain, inducing cancer and Alzheimer's disease; second, acid mist invades the lungs, induces pulmonary edema or leads to death; Third, long-term living in an environment containing acid sediments induces the production of excessive lipid oxide, which leads to an increase in the probability of arteriosclerosis, myocardial infarction and other diseases.

4) Corrosion of buildings, machinery and municipal facilities.

gram 10200g

2.Kilogram.

16kg2000t

II.1Acid rain changes the acidity and alkalinity of the land, and it is that some places become acidic, which has a negative effect on plant growth.

2.The high-rise buildings in the acid rain capital city also have a corrosive effect, causing corrosion to public equipment made of metal materials, which is also very large.

3.Acid rain flows into rivers, lakes and seas, which has a great impact on aquatic life and can lead to the extinction of some species. People eat a lot of organisms that are affected by acid rain, which can also cause many diseases.

1.(1)1000×

2) Set the need for methanol x kg, according to the topic.

6nh3+5ch3oh+12o2=3n2+5co2+19h2ox

102x=160×

x=16kg

3）16000÷8=2000t

2.The land is acidic, killing aquatic animals and plants, and destroying forest vegetation.

It should be acidic and choose C

The reason is to look at it this way.

Neutralizing H2SO4 is neutralizing H+

What is needed is oh-

NaOH and KOH of the same mass because the relative molecular weight KOH is large.

Then the number of NAOH is more than that of KOH.

Then NaOH ionized out more OH- than KOH.

Then naoh just neutralizes h2so4.

KOH can't be neutralized, H2SO4 is more. Choose C

N(Naoh)=m (23+16+1)=m 40 and N(koh)=m (39+16+1)=m 56, so N(koh) is not completely summed after switching to mgkoh, so pH <7

The answer should be wrong.

The mass of 100t of hematite containing 20% impurities containing Fe2O3 is 100*(1-20%)=80t

Suppose the mass of pig iron that can be smelted up to 96% iron is x.

Fe2O3 + 3Co = High temperature = 2Fe + 3CO2160 11280T 96%x160 80=112 96%x

x = A: Pig iron containing up to 96% iron can be smelted.