A model represents a place thing or idea. A made is a model as it shows a place and represents the place it’s showing such as a globe
Answer: When silver is exposed to sulfur-containing gases in the air, it discolours and then darkens as it reacts with the gas to form a surface layer of tarnish. This process is called tarnishing.
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Answer: D may be equal to, greater than, or less than the total amount of the reactants.
Explanation:
Answer:
0.893mol
Explanation:
n = m ÷ M
= 275 ÷ (23 + 80)
= 2.67 mol
* now use the Mol ratio *
NaBr : FeBr3
6 : 2
2.67 : x
5.67 = 6x
n( FeBr3 ) = 0.893 mol
12.5%
Three half lives pass. 50% -> 25% -> 12.5%
