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How can you be sure that at least one chemical change has occurred?
You can be sure that a chemical change has occurred if there is a change in color, formation of a precipitate, evolution of gas, or absorption/release of heat during the reaction. These are all indicative of a chemical reaction where the substances are transformed into different compounds with new chemical properties.
Is hydrochloric acid reacting with sodium hydroxide to produce salt water and heat a physical or chemical change?
chemical as it is a permanent change and looks nothing like the starting reactant!
What are the four occurrences indicate a chemical reaction has occurred?
A chemical reaction can result in any or all of the following: - a change in temperature (up or down) - a change in color - a smell that wasn't there before - the formation of bubbles (indicating the production of a gas) - the formation of a precipitate
If one substance changes color is it a chemical reaction?
Not necessarily. Things sometimes change colors during a chemical reaction, but a color change is not sufficient evidence of a chemical reaction. You can add drink mix to water and the water turns colors, but it is not a chemical reaction, just a mixture.
Why is color change considered a chemical change?
Color change is considered a chemical change because it involves a transformation at the molecular level, where the chemical composition of the substance is altered, leading to a change in its color. This change is irreversible and indicates a chemical reaction has occurred.
How does a chemical equation show that a chemical reaction has occurred?
A chemical equation shows that chemical reaction has occurred as new substances have been formed from the reagents. A chemical equation has two sides before reaction and after reaction, if there is any change from the before reaction side to the after reaction side, it indicates that a chemical reaction has just occurred.
How we know a chemical change has occurred when burning a candle?
Burning is a chemical reaction, an oxydation.
How do you know when a chemical reaction happend?
You can tell a chemical reaction has occurred if there is a change in color, formation of a gas or solid precipitate, evolution of heat or light, or a change in odor. Additionally, changes in the chemical composition, such as the breaking or forming of bonds between atoms, indicate a chemical reaction has taken place.
When paper changes from yellow to brown in sunlight what type of change occurred?
A chemical change. Color change is a good indicator of a chemical change.
How can you be sure that at least one chemical change has occurred?
You can be sure that a chemical change has occurred if there is a change in color, formation of a precipitate, evolution of gas, or absorption/release of heat during the reaction. These are all indicative of a chemical reaction where the substances are transformed into different compounds with new chemical properties.
When substances are formed that are different from the starting substances has physical change occurred?
No, a physical change refers to a change in the form or appearance of a substance without any change in its chemical composition. If new substances are formed with different chemical properties, then a chemical change has occurred, not a physical change.
When bromine reacts with sodium to form a white solid is it a physical or chemical change?
The reaction between bromine and sodium to form a white solid is a chemical change. This is because the atoms are rearranging to form new compounds with different properties, indicating a chemical reaction has occurred.
How can you tell the difference between a chemical reaction and not a chemical reaction?
A chemical reaction will do the following; Change colour Create smoke A non chemical reaction (Physical Reaction) will do the following; Change State Be able to change back to the original materials
What is the difference between chemical change and chemical reaction?
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Is hydrochloric acid reacting with sodium hydroxide to produce salt water and heat a physical or chemical change?
chemical as it is a permanent change and looks nothing like the starting reactant!
Which observation does not indicate that a chemical reaction has occured?
A change in state, such as boiling or melting, does not always indicate a chemical reaction has occurred. It could be a physical change.
What are the four occurrences indicate a chemical reaction has occurred?
A chemical reaction can result in any or all of the following: - a change in temperature (up or down) - a change in color - a smell that wasn't there before - the formation of bubbles (indicating the production of a gas) - the formation of a precipitate
