Which of the following is an example of a chemical change?
A change in water from a solid to a liquid
A log burning over a fire Adding salt to a pot of water
Painting a fence brown
don't mean for a spoil alert but the answer is a log burning over a fire your welcome
You need to look up the definition of a chemical change. A chemical change is one in which the products are not the same as the reactants. In other words the composition has changed. For example, melting water (H2O) from solid ice to liquid water (still H2O) to steam (still H2O) is not a chemical change. These are phase changes (physical changes) but not chemical changes because the composition of ice, liquid water, and steam are the same; i.e. H2O.
do you know what the correct answer is for what is a chemical change
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Well, well, well. Time for some chemistry humor! Out of the options you've given, the example of a chemical change is adding salt to a pot of water. You see, when you add salt to water, it dissolves and forms new chemical bonds. It's like the water is saying, "Hey salt, let's hang out and become salty water!" So, that's a chemical change for you!
The correct answer is "A log burning over a fire." This is an example of a chemical change because the log is being transformed into ash and smoke due to combustion. Chemical changes involve the creation or destruction of chemical bonds, resulting in the formation of new substances with different properties.
To determine whether a change is a chemical or physical change, you need to understand the characteristics of each. In a physical change, the substance remains the same, but its state or appearance may be altered, such as in the case of water changing from a solid (ice) to a liquid (water).
For the choices:
- A change in water from a solid to a liquid is a physical change because the chemical composition of water remains the same; only the physical state has changed.
- Adding salt to a pot of water is also a physical change. The salt dissolves in the water, but it does not undergo a chemical reaction or change its composition.
- Painting a fence brown is a physical change. It alters the appearance of the fence, but the chemical composition of the paint and the fence remains the same.
In summary, the only example of a chemical change among the given options is a log burning over a fire, as it involves the combustion of the log and the formation of new substances.