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Why does the change in the color of material indicate that a chemical reaction occurred?
A change in color can indicate a chemical reaction has occurred because the reaction might be producing or consuming a colored compound. This means that the chemical composition of the material has changed, leading to a different color being observed. The new color can be a result of the formation of new substances with different properties than the initial materials.
How might a thermometer help you decide if there was any chemical change on mixing iron and charcoal?
For a chemical change to occur, there must be a chemical reaction. A chemical reaction would be either endothermic (uses energy, mostly heat), or exothermic (produces energy, again mostly heat). Any change in temperature of the reactants, as measured by a thermometer, will tell you not only ifa chemical reaction occurred, but also which kind of chemical reaction. No temperature change usually indicates that no reaction has occurred, a decrease in temperature would indicate an endothermic reaction, while an increase in temperature would indicate an exothermic reaction.
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
What does it indicate when the value of G is negative in a chemical reaction?
When the value of G is negative in a chemical reaction, it indicates that the reaction is spontaneous and releases energy.
Which arrow is used to indicate a reverse or backward reaction in a chemical equation?
The arrow that is used to indicate a reverse or backward reaction in a chemical equation is called a double-headed arrow.
What symbols indicate that a chemical reaction has occurred?
The sign equql + or an arrow to right.
What should not be used to indicate a chemical reaction?
Change of shape can not be used to indicate a chemical reaction has happened. Examples of evidence of a chemical reaction are changes in odor or color.
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.
Why does the change in the color of material indicate that a chemical reaction occurred?
A change in color can indicate a chemical reaction has occurred because the reaction might be producing or consuming a colored compound. This means that the chemical composition of the material has changed, leading to a different color being observed. The new color can be a result of the formation of new substances with different properties than the initial materials.
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.
What in A change in means that a chemical reaction has occurred?
A change in means that a chemical reaction has occurred when there is a noticeable alteration in the properties of the substances involved. This can include changes in color, temperature, the formation of gas, or the production of a precipitate. Additionally, the reactants are transformed into different products with distinct chemical identities. These observable changes indicate that a chemical reaction has taken place.
What does this indicate about the reaction that took place in the beaker?
The formation of white precipitate indicates a chemical reaction occurred in the beaker that resulted in the precipitation of a solid product from the solution.
Describe three changes in appearance which show that a chemical reaction is taking place?
Change in color: If the reactants and products have different colors, a visible color change can indicate a chemical reaction. Formation of a gas: Production of bubbles, froth, or fizzing can indicate a gas is being released during a chemical reaction. Formation of a precipitate: If a solid substance forms in a solution, it can indicate that a chemical reaction has occurred leading to the formation of an insoluble product.
How might a thermometer help you decide if there was any chemical change on mixing iron and charcoal?
For a chemical change to occur, there must be a chemical reaction. A chemical reaction would be either endothermic (uses energy, mostly heat), or exothermic (produces energy, again mostly heat). Any change in temperature of the reactants, as measured by a thermometer, will tell you not only ifa chemical reaction occurred, but also which kind of chemical reaction. No temperature change usually indicates that no reaction has occurred, a decrease in temperature would indicate an endothermic reaction, while an increase in temperature would indicate an exothermic reaction.
What would provide the best evidence that a chemical reaction had occurred?
The best evidence that a chemical reaction has occurred includes observable changes such as the formation of a gas (bubbles), a color change, the production of light or heat (exothermic reaction), or the formation of a precipitate (solid). Additionally, changes in properties such as odor or taste can also indicate a reaction. These indicators signify that new substances with different chemical properties have been formed.
What is present after a chemical reaction?
That depends on the chemicals present before the chemical reaction and sometimes the conditions under which the chemical reaction occurred.
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
