Answer:
The flask has to be closed during the hydrochloric acid and sodium carbonate reaction as the resultant gas got trapped inside the closed flask.
Explanation:
The hydrochloric acid and sodium carbonate reaction was exothermic that caused the pressure to decrease. The flask has to be closed during the hydrochloric acid and sodium carbonate reaction as the resultant gas got trapped inside the closed flask.
In exothermic reactions, energy is produced in the form of heat or light.
Answer:
b energy is being released from the atoms
Explanation:
Seeing light from fireworks implies that energy is being released from the atoms. This is an excitation as the electrons within the atom moves from a higher energy level to a lower energy level.
- When electrons undergo this kind of transition, energy is released.
- The radiation produced is dispersed out and it is seen as colorful lights.
- Most times such processes are exothermic
Answer:
Gold is an element even when it is in a solution
The answer is C. sugar water. Sugar can dissolve in water completely and form the solution. While other three are all heterogeneous mixture.
Answer:
because it will control the birth of a child which can happen alot being overpopulated in the country or world. It also can mange their life and create a small and happy and healthy family.Also the child can get more love and support from their parents if they have less children and it wont be a taruma for the couple as well. because growing a child can be expensive time costly and really hard.
Explanation:
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