7. A conclusion is an educated guess,
or, prediction, about what will happen after the experiment.
8. In observation we use all five senses to gather information.
9. In result we analyze and summarize and ask if the hypothesis was correct.
10. Something that changes or varies in an experiment is called variable.
Ans:
Conclusion
Observation
Results
Variable
During physical changes, matter always retains its chemical properties.
Lol, onions. Onions produce a chemical irritant called synpropanerhial-S-oxide.
Answer:
Gold
Explanation:
We are given that
Mass of sample ,m=385 g
Volume ,V=20mL
We have to find the coin is gold or yellow brass.
We know that
Density=
Using the formula
Density of coin=19.3g/mL
Density of gold=19.3g/mL
Hence, the coin is gold.