Two commonly used methods to have backup power are:
1) Batteries. Note that these have to be recharged now and then; even if you don't use them, the charge will leak.
2) A gasoline-operated generator.
No, electrical conductivity is a physical property that depends on the ability of a material to carry an electric current. It is not a chemical change because the chemical composition of the substance remains the same.
Usually it means that something has gone through a physical change and any chemical properties of that substance are not altered.
No, a chemical property is a characteristic of a substance that describes its ability to undergo specific chemical changes or reactions, such as flammability, reactivity with acids, or stability in certain conditions. It is not about changing into something else, but about how a substance interacts with other substances.
Stating that something is flammable is stating a chemical property. But the actual burning would be a chemical change.
A physical change is one you can see. It changes the size, shape, or color of something. A chemical change is one that changes the composition of something. Basically, when a substance is changed into a different substance.
If something is not a mixture then it is a pure substance, either an element or a compound.
An example of something that stores chemical energy is a battery. Batteries store energy in the form of chemical compounds that can be converted into electrical energy when needed.
chemical change. look it up
Only if the mixture is a physical, not chemical, change.
Something that reacts to another substance.
Yes, the ability to melt easily is a physical property of a substance, not a chemical property. Chemical properties describe how a substance reacts with other substances or undergoes chemical changes.
Battery