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What indicates that an exothemic chemical reaction occurs when two substances are mixed together?
Exothermic reactions release heat energy, so they would produce heat (increase in temperature). This can easily be tested by touching the container with your hands, or by using a thermometer. The opposite is an 'endothermic' reaction, which absorbs energy and feels colder.
Signs of chemical change?
Signs of a chemical change include the formation of a precipitate, a color change, the release of gas (bubbles), and a temperature change (exothermic or endothermic). These changes indicate that new substances are being formed with different chemical properties than the original substances.
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 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.
Can the development of a solid can indicate the occurrence of a chemical change?
Yes
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 does a negative enthalpy indicate in a chemical reaction?
A negative enthalpy in a chemical reaction indicates that the reaction is exothermic, meaning it releases heat energy to the surroundings.
What indicates that an exothemic chemical reaction occurs when two substances are mixed together?
Exothermic reactions release heat energy, so they would produce heat (increase in temperature). This can easily be tested by touching the container with your hands, or by using a thermometer. The opposite is an 'endothermic' reaction, which absorbs energy and feels colder.
What does the hot tube indicate?
an exothermic reaction
Why is it important to observe temperature change when two chemical are mixed?
Observing temperature change when two chemicals are mixed can provide insight into whether a chemical reaction has occurred. An increase or decrease in temperature may indicate that the reaction is exothermic or endothermic, respectively. Monitoring temperature change can also help determine the reaction rate and the efficiency of the reaction.
What does a potential energy graph in chemistry reveal about the relationship between reactants and products in a chemical reaction?
A potential energy graph in chemistry shows the energy changes that occur during a chemical reaction. It reveals how the energy of the reactants compares to the energy of the products. The graph can indicate whether the reaction is exothermic (releasing energy) or endothermic (absorbing energy), and the overall energy difference between the reactants and products.
Why is energy written above the arrow?
Energy is often written above the arrow in chemical reactions to indicate whether a reaction is endothermic (energy is absorbed) or exothermic (energy is released). This notation helps to show the overall energy change during the reaction.
List three signs that could make you think a chemical reaction might be taking place?
Formation of bubbles or gas: Gas evolution can indicate a chemical reaction is occurring. Change in color: A sudden change in color could be a sign of a reaction, such as a shift from clear to cloudy. Temperature change: If the reaction generates heat (exothermic) or absorbs heat (endothermic), it can be an indication that a chemical reaction is taking place.
Signs of chemical change?
Signs of a chemical change include the formation of a precipitate, a color change, the release of gas (bubbles), and a temperature change (exothermic or endothermic). These changes indicate that new substances are being formed with different chemical properties than the original substances.
What do chemical symbols indicate?
Chemical symbols indicate elements.
Ask us anythingWhich of the following indicates an endothermic reaction?
A + B + heat —> C + D
What do you use a chemical indicator for?
to indicate what the chemical is.
