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Latihan Soal OSK Level 2
#11
Bantu jawab Dikuark.
Cuka = asam asetat. Kapur = basa kalsium karbonat. Hasil reaksinya garam kalsium asetat, dan asam karbonat yang tidak stabil dan terombak menjadi air dan CO2. Ini terlihat sebagai gelembung busa. Maka, perubahan yang menghasilkan zat baru yg berbeda sifat dengan zat asal, dan reaksi yang menghasilkan gas, menunjukkan terjadinya perubahan kimia.
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#12
(04-02-2017, 12:36 AM)ahnaf Wrote: Bantu jawab Dikuark.
Cuka = asam asetat. Kapur = basa kalsium karbonat. Hasil reaksinya garam kalsium asetat, dan asam karbonat yang tidak stabil dan terombak menjadi air dan CO2. Ini terlihat sebagai gelembung busa. Maka, perubahan yang menghasilkan zat baru yg berbeda sifat dengan zat asal, dan reaksi yang menghasilkan gas, menunjukkan terjadinya perubahan kimia.

Oh gitu yaaa
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#13
Wink 
Yang A!! karena yang b sama yang c sudah mengubah sifat dari airny
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#14
Cuka dan kapur menjadi gelembung busa.lama lama lapisan kulit kapur pada telur menghilang lalu telur menjadi seperti karet tetapi didalamnya tetep mentah ya
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#15
(04-02-2017, 12:36 AM)ahnaf Wrote: Bantu jawab Dikuark.
Cuka = asam asetat. Kapur = basa kalsium karbonat. Hasil reaksinya garam kalsium asetat, dan asam karbonat yang tidak stabil dan terombak menjadi air dan CO2. Ini terlihat sebagai gelembung busa. Maka, perubahan yang menghasilkan zat baru yg berbeda sifat dengan zat asal, dan reaksi yang menghasilkan gas, menunjukkan terjadinya perubahan kimia.

jawabanku sama kayak ahnaf..
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#16
my answer is same like Azzie-chan
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#17
Vinegar
From Wikipedia, the free encyclopedia
This article may have too many section headers dividing up its content. Please help improve the article by merging similar sections and removing unneeded subheaders. (January 2017)
A variety of flavored vinegars on sale in France (bottom rows)

Vinegar is a liquid consisting of about 5–20% acetic acid (CH3COOH), water, and other trace chemicals, which may include flavorings. The acetic acid is produced by the fermentation of ethanol by acetic acid bacteria.[1] Vinegar is now mainly used as a cooking ingredient, or in pickling. As the most easily manufactured mild acid, it has historically had a great variety of industrial, medical, and domestic uses, some of which (such as its use as a general household cleaner) are still commonly practiced today.

Commercial vinegar is produced either by a fast or a slow fermentation processes. In general, slow methods are used in traditional vinegars where fermentation proceeds slowly over the course of a few months or up to a year. The longer fermentation period allows for the accumulation of a non-toxic slime composed of acetic acid bacteria. Fast methods add mother of vinegar (bacterial culture) to the source liquid before adding air to oxygenate and promote the fastest fermentation. In fast production processes, vinegar may be produced between 20 hours to three days.
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#18
Chalk
From Wikipedia, the free encyclopedia
This article is about the sedimentary rock. For other uses, see Chalk (disambiguation).
Chalk Sedimentary rock
The Needles.jpg
The Needles, situated off the Isle of Wight, are part of the extensive Southern England Chalk Formation.
Composition
calcite (calcium carbonate)

Chalk (pronunciation: /ˈtʃɔːk/) is a soft, white, porous, sedimentary carbonate rock, a form of limestone composed of the mineral calcite. Calcite is an ionic salt called calcium carbonate or CaCO3. It forms under reasonably deep marine conditions from the gradual accumulation of minute calcite shells (coccoliths) shed from micro-organisms called coccolithophores. Flint (a type of chert unique to chalk) is very common as bands parallel to the bedding or as nodules embedded in chalk. It is probably derived from sponge spicules or other siliceous organisms as water is expelled upwards during compaction. Flint is often deposited around larger fossils such as Echinoidea which may be silicified (i.e. replaced molecule by molecule by flint).

Chalk as seen in Cretaceous deposits of Western Europe is unusual among sedimentary limestones in the thickness of the beds. Most cliffs of chalk have very few obvious bedding planes unlike most thick sequences of limestone such as the Carboniferous Limestone or the Jurassic oolitic limestones. This presumably indicates very stable conditions over tens of millions of years.
"Nitzana Chalk curves" situated at Western Negev, Israel are chalk deposits formed at the Mesozoic era's Tethys Ocean

Chalk has greater resistance to weathering and slumping than the clays with which it is usually associated, thus forming tall steep cliffs where chalk ridges meet the sea. Chalk hills, known as chalk downland, usually form where bands of chalk reach the surface at an angle, so forming a scarp slope. Because chalk is well jointed it can hold a large volume of ground water, providing a natural reservoir that releases water slowly through dry seasons.
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#19
Rose
From Wikipedia, the free encyclopedia
For other uses, see Rose (disambiguation), Roses (disambiguation), and Rosa.
Rose
Rosa rubiginosa 1.jpg
Rosa rubiginosa
Scientific classification
Domain: Eukaryota
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Rosales
Family: Rosaceae
Subfamily: Rosoideae
Genus: Rosa
L.
Species

See List of Rosa species
Synonyms

Hulthemia Dumort.
×Hulthemosa Juz. (Hulthemia × Rosa)

A rose is a woody perennial flowering plant of the genus Rosa, in the family Rosaceae, or the flower it bears. There are over a hundred species and thousands of cultivars. They form a group of plants that can be erect shrubs, climbing or trailing with stems that are often armed with sharp prickles. Flowers vary in size and shape and are usually large and showy, in colours ranging from white through yellows and reds. Most species are native to Asia, with smaller numbers native to Europe, North America, and northwestern Africa. Species, cultivars and hybrids are all widely grown for their beauty and often are fragrant. Roses have acquired cultural significance in many societies. Rose plants range in size from compact, miniature roses, to climbers that can reach seven meters in height. Different species hybridize easily, and this has been used in the development of the wide range of garden roses.[1]

The name rose comes from French, itself from Latin rosa, which was perhaps borrowed from Oscan, from Greek ρόδον rhódon (Aeolic βρόδον wródon), itself borrowed from Old Persian wrd- (wurdi), related to Avestan varəδa, Sogdian ward, Parthian wâr.[2][3]
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#20
ternyata orang frence namakan rose.
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