An example of how we use science in our everyday life is cooking and baking. We combine certain ingredients and certain measurements to make delicious foods and drinks. And when we add heat, it makes bread rise, causing a chemical reaction because you cannot reverse a cake back into the individual ingredients.
Hope this helps! :3 (This is not a sample from anything. This is in my own words, so I’m not sure if it is right, but this is an example of how we use science.)
Answer: When you turn a light on it becomes bright :)
In electrical wiring, a light switch is a switch most commonly used to operate electric lights, permanently connected equipment, or electrical outlets. Portable lamps such as table lamps may have a light switch mounted on the socket, base, or in-line with the cord. Manually operated on/off switches may be substituted by dimmer switches that allow controlling the brightness of lamps as well as turning them on or off, time-controlled switches, occupancy-sensing switches, and remotely controlled switches and dimmers. Light switches are also found in flashlights, vehicles, and other devices.
The mass of the reactants should not change, in fact it would be equal because the only thing that changes is the form in which your products are in. The reactants will still have the same amount of mass from the products as no products were removed or added, the structure changed, the mass did not.
