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Why did limestone deposits become common 1.8 billion years ago?
Limestone is made of calcium carbonate. Around 1.8 billion years ago the sea started to oxidize because cyanobacteria produced carbon dioxide. Calcium ions could be easily found because protists used them. Thus calcium carbonate was easy to make after the seas were oxidized
Is liquid gas an element mixture or compound?
A compound is where the elemental components are chemically bonded at the molecular level and can only be separated with great effort (not evaporation). The liquid could have been a mixture (hard water for example; water with minerals, fluoride, calcium, salt whatever) and the dissolved minerals left behind when the liquid evaporated. However the liquid itself could be a compound (such as pure water) but the fact it left behind 'impurities' when it evaporated means it became a mixture or colloid when the impurities mixed into the liquid. So if the container was completely clean when the liquid was put in and there was no possibility of impurities being introduced from the air or other sources, it was a mixture before it evaporated.
How did Sir Humphry Davy know potassium was an element?
Potassium was discovered in 1807 by Humphry Davy, who derived it from caustic potash (KOH).It is reasonable to think that at that time he worked in London at the Royal Institution, though he might have lived in his hometown of Penzance, Cornwall[I've digged that out of the following incomplete citations from en.wikipedia]"Davy wrote to Davies Giddy on March 8, 1801 about the offers made by Banks and Thompson, a possible move to London and the promise of funding for Davy's work in galvanism.""By June 1802, after just over a year at the Institution and at the age of 23, Davy was nominated to full lecturer at the Royal Institution of Great Britain. In November 1804 Davy became a Fellow of the Royal Society, over which he would later preside"
Wegener's theory that the continents slowly moved over earths surface became known as?
Wegener's theory that the continents slowly moved over Earth's surface became known as the theory of continental drift.
What animal figure dressed as a forest ranger became a famous sybol?
Smokey Bear, a bear dressed as a forest ranger, became a famous symbol for wildfire prevention in the United States. Created in 1944, Smokey Bear's motto is "Only you can prevent wildfires."
Is became a compound word?
No, "became" is not a compound word. It is a simple past tense form of the verb "become." Compound words are formed by combining two or more separate words.
How is slaked lime obtained from lime?
Calcium hydroxide, traditionally called slaked lime, hydrated lime, slack lime or pickling lime, is a chemical compound with the chemical formula Ca(OH)2. It is a colourless crystal or white powder, and is obtained when calcium oxide (called lime or quicklime) is mixed, or "slaked" with water. It can also be precipitated by mixing an aqueous solution of calcium chloride and an aqueous solution of sodium hydroxide. The name of the natural, mineral form is portlandite. It is relatively rare mineral, known from some volcanic, plutonic and metamorphic rocks. It has also been known to arise in burning coal dumps. When heated to 512 °C, the partial pressure of water in equilibrium with calcium hydroxide reaches 101 kPa and decomposes into calcium oxide and water.[1] A suspension of fine calcium hydroxide particles in water is called milk of lime. The solution is called lime water and is a medium strength base that reacts violently with acids and attacks many metals in presence of water. It turns milky if carbon dioxide is passed through, due to precipitation of calcium carbonate. Cal (slaked lime). The Aztecs discovered that by soaking their dried corn in wood ash, the corn became easier to grind and also more digestible, thus, more nutritious. The same process is used today to "slake corn". This processed corn is called Nixtamal. It is later ground into fine or coarse meal for tortillas or tamales or used whole for making Posole. Our "cal" comes in a 1 pound cello bag.its when the lime is slaking in its role at work so it is fired
What is the compound verb in the sentence She fulfilled her dream and became an English teacher?
fulfilled
Who became the Formula One World Champion in 2008?
lewis hamilton
What would you expect to happen to a resting skeletal muscle if the sarcolemma suddenly became very permeable to calcium ions?
Because the amount of cross-bridge formation is proportional to the amount of available calcium ions, increased permeability of the sarcolemma to Ca2+ would lead to an increased intracellular concentration of Ca2+ and a greater degree of contraction.
Who became the 2007 formula 1 world driver's champion in october?
Kimi Räikkönen
What racing competition became a best of nine series in 1995?
Hbvg
Who was the diver won the 2008 formula 1 motor racing title?
It was Lewis Hamilton of Britain . He also became the first black man to win the formula 1 title.
Her brother was the teacher and her sister was the psychiatrist is this sentence a simple compound complex or compound-complex?
There are simple sentences which would be "Her brother was the teacher" or "Her sister was the psychiatrist". There are complex sentences like "Her brother was the teacher after Professor Thorn retired" or 'Before Mrs. Tyler, her sister was the psychiatrist". There are compound-complex like "Her brother became the teacher, and her sister became the psychiatrist, once the jobs were available". The sentence that's in the question is not put together correctly which isn't good. It should say "Her brother was the teacher, and her sister was the psychiatrist". Other then that the sentence is compound.
What formula 1 driver became a world champion in 1982 after winning one race?
Keke Rosberg, father of Nico
In 1907 Eugene Schueller a young French chemist developed an innovative formula that became the starting point for this company. What company is this?
L'Oreal
Whose record did Jaime Alguersuari break in 2009 when he became the youngest driver to start a Formula 1 race?
Mike Thackwell
