Answer:
A. unexpected change in odor
Explanation: Common physical changes include melting, change of size, volume, color, density, and crystal form. Example the classic baking soda and vinegar reaction provides evidence of a chemical change due to the formation of a gas and a temperature change.
Answer:
2nd order.
Explanation:
gras, grasshopper, frog, snake, eagle
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Answer:
1. S+ O2-->So2..... synthesis reaction or direct combination.
2.. precipitation reaction
3. Displacement reaction
4. Decomposition reaction
