Asked by Anon
Which is a chemical change?
A - splitting water into hydrogen and oxygen
B - breaking a block of solid ice into smaller pieces
C - freezing liquid water
D - boiling water
My answer: D
A - splitting water into hydrogen and oxygen
B - breaking a block of solid ice into smaller pieces
C - freezing liquid water
D - boiling water
My answer: D
Answers
Answered by
MathMate
A necessary condition for a chemical change is that the material final material is different from the original material.
For example, burning carbon in air gives carbon dioxide.
Material before change: carbon
product: carbon dioxide.
Since carbon is chemically different from carbon dioxide, burning carbon in air is a chemical change.
Based on the above, please give it another try.
For example, burning carbon in air gives carbon dioxide.
Material before change: carbon
product: carbon dioxide.
Since carbon is chemically different from carbon dioxide, burning carbon in air is a chemical change.
Based on the above, please give it another try.
Answered by
Anon
Oh okay. Answer: A
Answered by
MathMate
It's correct! Would you care to explain your reasoning?
Answered by
Nadege
Which has a change of plus 7?
Answered by
Seth turner
astle Bravo was the first in a series of high-yield thermonuclear weapon design tests conducted by the United States at Bikini Atoll, Marshall Islands, as part of Operation Castle. Detonated on March 1, 1954, the device was the most powerful nuclear device detonated by the United States and its first lithium deuteride fueled thermonuclear weapon.[1][2] Castle Bravo's yield was 15 megatons of TNT, 2.5 times the predicted 6.0 megatons, due to unforeseen additional reactions involving lithium-7,[3] which led to the unexpected radioactive contamination of areas to the east of Bikini Atoll. At the time, it was the most powerful artificial explosion in history.
Fallout, the heaviest of which was in the form of pulverized surface coral from the detonation, fell on residents of Rongelap and Utirik atolls, while the more particulate and gaseous fallout spread around the world. The inhabitants of the islands were not evacuated until three days later and suffered radiation sickness. Twenty-three crew members of the Japanese fishing vessel Daigo Fukuryū Maru ("Lucky Dragon No. 5") were also contaminated by the heavy fallout, experiencing acute radiation syndrome. The blast incited international reaction over atmospheric thermonuclear testing.[4]
The Bravo Crater is located at 11°41′50″N 165°16′19″E. The remains of the Castle Bravo causeway are at 11°42′6″N 165°17′7″E.
Fallout, the heaviest of which was in the form of pulverized surface coral from the detonation, fell on residents of Rongelap and Utirik atolls, while the more particulate and gaseous fallout spread around the world. The inhabitants of the islands were not evacuated until three days later and suffered radiation sickness. Twenty-three crew members of the Japanese fishing vessel Daigo Fukuryū Maru ("Lucky Dragon No. 5") were also contaminated by the heavy fallout, experiencing acute radiation syndrome. The blast incited international reaction over atmospheric thermonuclear testing.[4]
The Bravo Crater is located at 11°41′50″N 165°16′19″E. The remains of the Castle Bravo causeway are at 11°42′6″N 165°17′7″E.
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