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Manfaat dan Efek Samping Bahan Kimia

Zat-zat yang ada dalam kehidupan kita sehari-hari kebanyakan tidak dalam keadaan murni, telah bercampur dengan dua atau lebih zat alinnya. Campuran suatu zat juga akan tetap mempertahankan sifat-sifat unsurnya. Oleh karena itu,suatu bahan kimia juga akan dipengaruhi oleh sifat,kegunaan,atau efek dari zat-zat yang menyusunnya. Kekuatan pengaruh sifat masing-masing zat juga bergantung pada kandungan dalam bahan yang bersangkutan. Banyak ragam bahan kimia yang ada dalam kehidupan sehari-hari.

Berikut ini sebagian manfaat dan efek samping bahan kimia :

1. Sabbun atau diterjen

Dalam kehidupan sehari-hari, kita juga telah mengenal berbagai bahan kimia pembersih, diantaranya sabun dan diterjen. Sabun dan ditergen dapat menjadikan lemak dan minyak yang tadinya tidak dapat bercampur dengan air menjadi mudah bercampur. Sabun dan ditergen dalam air juga dapat melepaskan sejenis ion yang telah memiliki bagian yang suka air (hidrofilik) sehingga dapat larut dalam air dan bagian yang tidak suka akan air (hidrofobik) sehingga larut dalam minyak atau lemak.

2. Pemutih pakaian

Pemutih biasanya telah dijual dalam bentuk larutannya dan digunakan untuk dapat menghilangkan kotoran atau noda berwarna yang sukar untuk dihilangkan dengan hanya mengguanakan sabun atau ditergen.

3. Pewangi pakaian

Pewangi juga merupakan bahan kimia lain yang erat kaitannya dengan kehidupan kita sehari-hari. Kita juga dapat memperoleh bahan pewangi dari bahan alam maupun sintetik. Bahan pewangi alami yang sudah kita kenal diantaranya telah diperoleh dari daun kayu putih, kulit kayu manis,batang kayu cendana,bunga kenanga,bunga melati dan buah pala. Bahan pewangi sintetik biasanya telah dipakai dalam berbagai pewangi atau parfum dalam kemasan.

4. Pestisida

Bahan kimia jenis pestisida erat sekali dengan kehidupan para petani. Pestisida dipakai untuk dapat memberantas hama tanaman sehingga tidak menganggu hasil produksi pertanian. Pestisida meliputi semua jenis obat (zat/bahan kimia) pembasmi hama yang ditujukan untuk dapat melindungi tanaman dari serangga,jamur,bakteri,virus, tikus,bekicot dan nematode (cacing).


Editor : Dian Sukmawati

MANFAAT DAN EFEK SAMPING BAHAN KIMIA

Public perceptions of race relations in America have grown substantially more negative in the aftermath of the death of a young black man who was injured while in police custody in Baltimore and the subsequent unrest, far eclipsing the sentiment recorded in the wake of turmoil in Ferguson, Mo., last summer.

Americans are also increasingly likely to say that the police are more apt to use deadly force against a black person, the latest New York Times/CBS News poll finds.

The poll findings highlight the challenges for local leaders and police officials in trying to maintain order while sustaining faith in the criminal justice system in a racially polarized nation.

Sixty-one percent of Americans now say race relations in this country are generally bad. That figure is up sharply from 44 percent after the fatal police shooting of Michael Brown and the unrest that followed in Ferguson in August, and 43 percent in December. In a CBS News poll just two months ago, 38 percent said race relations were generally bad. Current views are by far the worst of Barack Obama’s presidency.

The negative sentiment is echoed by broad majorities of blacks and whites alike, a stark change from earlier this year, when 58 percent of blacks thought race relations were bad, but just 35 percent of whites agreed. In August, 48 percent of blacks and 41 percent of whites said they felt that way.

Looking ahead, 44 percent of Americans think race relations are worsening, up from 36 percent in December. Forty-one percent of blacks and 46 percent of whites think so. Pessimism among whites has increased 10 points since December.

Continue reading the main story
Do you think race relations in the United States are generally good or generally bad?
60
40
20
0
White
Black
May '14
May '15
Generally bad
Continue reading the main story
Do you think race relations in the United States are getting better, getting worse or staying about the same?
Getting worse
Staying the same
Getting better
Don't know/No answer
All adults
Whites
Blacks
44%
37
17
46
36
16
41
42
15

The poll finds that profound racial divisions in views of how the police use deadly force remain. Blacks are more than twice as likely to say police in most communities are more apt to use deadly force against a black person — 79 percent of blacks say so compared with 37 percent of whites. A slim majority of whites say race is not a factor in a police officer’s decision to use deadly force.

Overall, 44 percent of Americans say deadly force is more likely to be used against a black person, up from 37 percent in August and 40 percent in December.

Blacks also remain far more likely than whites to say they feel mostly anxious about the police in their community. Forty-two percent say so, while 51 percent feel mostly safe. Among whites, 8 in 10 feel mostly safe.

One proposal to address the matter — having on-duty police officers wear body cameras — receives overwhelming support. More than 9 in 10 whites and blacks alike favor it.

Continue reading the main story
How would you describe your feelings about the police in your community? Would you say they make you feel mostly safe or mostly anxious?
Mostly safe
Mostly anxious
Don't know/No answer
All adults
Whites
Blacks
75%
21
3
81
16
3
51
42
7
Continue reading the main story
In general, do you think the police in most communities are more likely to use deadly force against a black person, or more likely to use it against a white person, or don’t you think race affects police use of deadly force?
Police more likely to use deadly force against a black person
Police more likely to use deadly force against a white person
Race DOES NOT affect police use of deadly force
Don't know/No answer
All adults
Whites
Blacks
44%
37%
79%
2%
2%
1%
46%
53%
16%
9%
8%
4%
Continue reading the main story
Do you favor or oppose on-duty police officers wearing video cameras that would record events and actions as they occur?
Favor
Oppose
Don't know/No answer
All adults
Whites
Blacks
92%
93%
93%
6%
5%
5%
2%
2%
2%

Asked specifically about the situation in Baltimore, most Americans expressed at least some confidence that the investigation by local authorities would be conducted fairly. But while nearly two-thirds of whites think so, fewer than half of blacks agree. Still, more blacks are confident now than were in August regarding the investigation in Ferguson. On Friday, six members of the police force involved in the arrest of Mr. Gray were charged with serious offenses, including manslaughter. The poll was conducted Thursday through Sunday; results from before charges were announced are similar to those from after.

Reaction to the recent turmoil in Baltimore, however, is similar among blacks and whites. Most Americans, 61 percent, say the unrest after Mr. Gray’s death was not justified. That includes 64 percent of whites and 57 percent of blacks.

Continue reading the main story
As you may know, a Baltimore man, Freddie Gray, recently died after being in the custody of the Baltimore police. How much confidence do you have that the investigation by local authorities into this matter will be conducted fairly?
A lot
Some
Not much
None at all
Don't know/No answer
All adults
Whites
Blacks
29%
31
22
14
5
31
33
20
11
5
20
26
30
22
In general, do you think the unrest in Baltimore after the death of Freddie Gray was justified, or do you think the unrest was not justified?
Justified
Not justified
Don't know/No answer
All adults
Whites
Blacks
28%
61
11
26
64
11
37
57
6

Negative View of U.S. Race Relations Grows, Poll Finds

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