Answer:
B. It showed that microorganisms bring about chemical changes
Explanation:
In 1857 Pasteur was working to solve a problem with the distillers of Lille in wich in their barrels the alcoholic fermentation become in a lactic fermentation, and of course, that was something that they didn't want. Throughout diferents studyes Pasteur discover that different microorganism where involved directly (where responsible) in different types of fermentation. That was the key to start the microbiology studies worldwide.
D. chlorine (Cl)
Chlorine is a nonmetal. Chlorine is a halogen in family VIIA, which is on the right side of the metalloids on the periodic table.
No, unless you're doing some sort of course where they demand that you do. It's useful to remember the general features of the periodic table (what each block is, where they are in relation to each other, roughly where the most common elements are), but memorizing the entire thing would simply be a mnemonic exercise
Hope this helped
<span>One
mole of carbon weighs 12 grams and one mole of hydrogen weighs 1 gram.
Therefore, one mole of CH2 weighs 12 + 1 + 1 = 14 grams.
56 divided by 14 = 4
Therefore, you need 4 "moles" of CH2 to equal 56 grams of the unknown
substance. To get the equivalent of 4 "moles" of CH2 you need one mole
of C4H8.
Hope this helps :)
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