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To be certain that a chemical change has taken place you check the composition of the sample before and after the change. The following is a chemical property of water at 4 C is its ability to decompose into hydrogen and oxygen.

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What changes gives NO evidence that a chemical reaction has taken place?

Changes such as a change in state (solid to liquid), change in color, change in odor, change in solubility, or change in temperature do not provide direct evidence that a chemical reaction has occurred. These changes can be indicative of a physical change rather than a chemical change. To confirm a chemical reaction, additional evidence such as the formation of new substances, evolution of gas, or consumption of reactants is necessary.


What identifies a chemical change has taken place?

Signs that a chemical change has taken place include the formation of a gas, the formation of a precipitate, a change in temperature, and a change in color.


What is rusting mean?

A chemical change has taken place


What evidence is there to show that a chemical reaction has taken place when an egg is cooked?

The change in color indicates that a chemical reaction has taken place.


When liquid water evaporates which has taken place molecular change or chemical change?

Physical change.


What does not indcate that a chemical change may have taken place?

Fracture formation


How can you determine if a chemical reaction has occurred?

A chemical reaction can be determined by observing changes in physical properties, such as color, temperature, gas production, or formation of a precipitate. Additionally, chemical tests or instruments can be used to analyze the substances involved before and after the reaction to confirm a chemical change has taken place.


When paper turns yellow brown upon exposure to sunlight what type of change has taken place a chemical or physical change?

A chemical change has taken place. The exposure to sunlight causes the paper to undergo a chemical reaction, breaking down the molecules in the paper and causing the color change to occur.


How can you tell if a chemical reaction has taken place when a hot air balloon flies?

When a hot air balloon flies, the chemical reaction that occurs is the heating of the air inside the balloon, causing it to expand and become less dense than the surrounding air. This creates lift, allowing the balloon to rise. You can confirm that a chemical reaction has taken place by observing the change in volume and buoyancy of the air inside the balloon as it heats up.


How do you know when a chemical change has taken place when a firework goes off?

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Why is adding drink powder to water is chemical change?

No. If you evaporate the water, the drink powder is left behind. No chemical change has taken place.


What is making salt water to gargle for a sore throat a physical or chemical change?

Physical. It is a mixture of salt and water. No chemical change has taken place.