A student mixes two clear liquids together. After a few minutes, a white powdery solid can be seen settling on the bottom of the
test tube. Which of the following is a conclusion that the student can draw based on these observations?
A:The two liquids are toxic and should be handled with extreme caution.
B:The two liquids were pure substances before they were mixed.
C:The two liquids have been stored too long and are no longer good.
D:The two liquids have gone through a chemical change in which a new substance called a precipitate was produced.
1 answer:
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Answer:
Nitrogen has 5 valence electrons
Explanation:
nitrogen has it's attoms form triple bonds which are very hard to break
so non-reactive
Answer:
B) 82 protons
Explanation:
The number of protons for an element never change. 82 Is the atomic number for Pb which is how many protons it has. An isotope means it has more neutrons.
Answer:
increase
Explanation:
because in endothermic reaction heat is absorbed
It means that you are the brother or friend of the person doing the thumping
