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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.
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How might a thermometer help you decide if there was any chemical change on mixing iron and charcoal?
A thermometer can help you determine if there was a chemical change by measuring any temperature change that occurs during the reaction of iron and charcoal. If there is a noticeable increase or decrease in temperature, it could indicate a chemical reaction took place, as chemical reactions often involve the release or absorption of heat energy.
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 evidence do you have that a chemical reaction took place?
Evidence of a chemical reaction includes the formation of a new substance with different properties, changes in color, the release of gas or heat, or the formation of a precipitate. Additionally, changes in mass due to the rearrangement of atoms in the reactants can also indicate a chemical reaction has occurred.
Is a rusty penny an example of a chemical reaction true or false?
True. The formation of rust on a penny is an example of a chemical reaction. When the copper in the penny reacts with oxygen in the air to form copper oxide, it results in the characteristic brown color of rust.
What symbol is used in a chemical equation to indicate yields?
The symbol used in a chemical equation to indicate yields is the arrow "->". This arrow separates the reactants from the products in a chemical reaction.
What symbols indicate that a chemical reaction has occurred?
The sign equql + or an arrow to right.
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 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.
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.
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?
A thermometer can help you determine if there was a chemical change by measuring any temperature change that occurs during the reaction of iron and charcoal. If there is a noticeable increase or decrease in temperature, it could indicate a chemical reaction took place, as chemical reactions often involve the release or absorption of heat energy.
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
If the chemical properties of the substance have not changed has a chemical reaction occurred?
It depends: just try to relate, try to write a chemical equation for and see if there are byproducts. Most likely, if the same chemical still has its same properties After the reaction, a chemical reaction has not occurred.
When a substance is broken down or combined formingnew substance a has occurred?
A chemical reaction has occurred. In a chemical reaction, the atoms in the substances rearrange to form new substances with different properties than the original substances. This process involves breaking and/or forming chemical bonds.
How does the chemical equation show that a chemical reaction occurred?
When a compound produces.
Why does this indicate that a chemical reaction might have occurred?
Some indicators of a chemical reaction are: - change of color - change of odor - release of a gas - change of the temperature - change of the viscosity - formation of a precipitate - change of general appearance - possible explosion - possible chemiluminiscence
