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Is it a chemical reaction if you but copper in a fire and it turns black?
yes it is a chemical reaction because the change involved heat and all chemical reactions involve heat and a difference in the appearence of the substance which has recieved heat is noticed
When does the change in enthalpy equal heat in a chemical reaction?
The change in enthalpy equals the heat in a chemical reaction when the reaction occurs at constant pressure.
What are energy changers?
Chemical reactions usually involve change of heat due to energy absorbed or evolved during reaction.
Why does a change in body temperature indicate that a chemical reaction may have occurred?
A change in body temperature can indicate a chemical reaction because most chemical reactions involve the absorption or release of energy in the form of heat. If the reaction absorbs heat from the surroundings, it can cause a decrease in temperature, while if it releases heat, it can cause an increase in temperature. Monitoring changes in body temperature helps to detect and analyze chemical reactions.
When you reuse a crystal heat pack is that a chemical or physical change?
Reusing a crystal heat pack involves a physical change. When the heat pack is exposed to heat or boiled to reset the crystals, the change is reversible and does not involve a chemical reaction.
Why does a change in teperature indicate that a change reaction may have occured?
Chemical reactions that involve bond-breaking tend to absorb energy from the surroundings, making the surroundings cooler. Chemical reactions that involve making bonds release energy, which makes the surroundings hotter. An example of a temperature change in a chemical reaction is when a burning fire produces heat.
Is fireworks a physical change?
Yes, fireworks involve a chemical reaction where the materials inside the firework combine to produce light, heat, and sound. This chemical reaction is not reversible, so it is considered a chemical change rather than a physical change.
Can a chemical reaction cause heat?
Yes, the signs of a chemical reaction are: gas, precipitation, heat, color change
What change is exothermic chemical change?
A reaction in which heat is given out.
What are some non examples of combustion?
Melting an ice cube is not an example of combustion, as it does not involve a chemical reaction with oxygen to produce heat and light. Dissolving sugar in water is another non-example, as it is a physical change and does not involve the chemical process of combustion. Boiling water is also not combustion, as it is a phase change from liquid to gas due to heat, not a reaction with oxygen.
What is the relationship between the heat of reaction and the chemical reaction?
The heat of reaction is the amount of heat released or absorbed during a chemical reaction. It is a measure of the energy change that occurs as reactants are converted into products. The relationship between the heat of reaction and the chemical reaction is that the heat of reaction indicates whether a reaction is exothermic (releases heat) or endothermic (absorbs heat).
What is the description of the enthalpy of reaction?
The enthalpy of a chemical reaction is the change of heat during this reaction.
