How are chemical changes different from physical changes?(1 point)
Responses
They are reversible.
They are reversible.
They include shifts in the phase of matter.
They include shifts in the phase of matter.
They involve heat.
They involve heat.
They form new substances.
They form new substances.
All of the given responses are correct. Chemical changes are different from physical changes because they involve the formation of new substances, whereas physical changes do not. Chemical changes may also be accompanied by shifts in the phase of matter and involve heating or release of energy. Physical changes, on the other hand, do not form new substances and are usually reversible.
Chemical changes are different from physical changes in the following ways:
1. They are irreversible: Unlike physical changes, chemical changes cannot be easily reversed or undone. Once a chemical change occurs, it is usually difficult or impossible to revert back to the original substances.
2. They involve the formation of new substances: Chemical changes result in the creation of entirely new substances with different chemical properties. The original substances are transformed into new compounds or elements.
3. They often involve shifts in the phase of matter: While physical changes may involve changes in the state of matter (such as melting, freezing, or evaporating), chemical changes can also lead to shifts in the phase of matter. For example, a chemical reaction may produce a gas as a product, causing a change in the state of matter.
4. They involve the absorption or release of heat: Chemical reactions usually involve the absorption or release of energy in the form of heat. Heat is an essential component of many chemical reactions and is often used to initiate or control the reaction.
It is important to note that not all physical changes include these characteristics, and not all chemical changes involve a change in phase or the release of heat. However, these points generally distinguish chemical changes from physical changes.
Chemical changes and physical changes are different in several ways. Here are a few key differences:
1. Reversibility: Physical changes are usually reversible, meaning they can be undone. For example, if you freeze water, it turns into ice, but if you heat the ice, it will melt back into water. Chemical changes, on the other hand, are typically not reversible, once a chemical change occurs, it is difficult or impossible to reverse the process.
2. Phase change: Physical changes often involve a change in the state or phase of matter, such as when water evaporates or freezes. In these cases, the chemical composition of the substance does not change, only its physical appearance or arrangement. Chemical changes, on the other hand, involve a transformation of the chemical composition, resulting in the formation of new substances with different properties.
3. Heat involvement: Both physical and chemical changes can involve the addition or removal of heat. For example, melting an ice cube requires the input of heat energy. However, chemical changes are often accompanied by the release or absorption of heat energy. This can manifest as temperature changes, such as when a chemical reaction produces heat (exothermic) or absorbs heat (endothermic).
4. Formation of new substances: The most fundamental difference between chemical and physical changes is the formation of new substances. Physical changes do not result in the creation of new substances with different properties. In contrast, chemical changes involve the rearrangement of atoms or molecules, leading to the formation of entirely new substances that have different chemical properties than the original substances.
To determine whether a change is a chemical or physical change, you can observe these characteristics. Ask yourself if the change is reversible, if there is a change in the phase of matter, if heat is involved, and if new substances are formed.
whats the answer
The answer is that chemical changes and physical changes are different in several ways, as mentioned in the provided response. These differences include factors such as reversibility, the formation of new substances, phase changes, and heat involvement. To determine whether a change is chemical or physical, one can consider these characteristics.
this is not one of the options shown above
Apologies for the confusion. The options provided in your original question were accurate. The correct answer based on those options is:
Chemical changes are different from physical changes because they form new substances.
this are the options:
They are reversible.
They are reversible.
They include shifts in the phase of matter.
They include shifts in the phase of matter.
They involve heat.
They involve heat.
They form new substances.
They form new substances.
I dont see that option here?
I apologize for the oversight. You are correct, the option "Chemical changes form new substances" is not listed among the given options. I apologize for the confusion caused. The correct option from the given list is:
They form new substances.