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Describe the role of energy in chemical reactions?
Energy is required to break bonds between atoms in reactant molecules, allowing them to rearrange into new products. This energy is called activation energy. Some reactions release energy, called exothermic reactions, while others absorb energy, called endothermic reactions. Overall, energy is essential for driving chemical reactions and determining whether they proceed or not.
What is the relative amount of energy released in chemical reactions?
The relative amount of energy released in chemical reactions varies depending on the specific reaction. Some reactions release a lot of energy, while others release less or even absorb energy. This energy release or absorption is known as the reaction's enthalpy change.
What do chemical changes always take in or give off?
Some reactions give off heat (exothermic), others absorb heat (endothermic). All reactions increase entropy.
What two kinds of energy changes can take place during a chemical reaction?
Two types of energy changes that can occur in a chemical reaction are (1) endothermic and (2) exothermic. Endothermic is where energy is added to the system and exothermic is where energy is given off by the system.
Why some reactions are endothermic or exothermic?
Put in a simple way, endothermic is when the chemical reaction "absorb" heat or the temperature of the mixture increases. On the other hand, exothermic is when the chemical reaction "free" heat and the temperature of the mixture decreases.
Describe the role of energy in chemical reactions?
Energy is required to break bonds between atoms in reactant molecules, allowing them to rearrange into new products. This energy is called activation energy. Some reactions release energy, called exothermic reactions, while others absorb energy, called endothermic reactions. Overall, energy is essential for driving chemical reactions and determining whether they proceed or not.
What is the relative amount of energy released in chemical reactions?
The relative amount of energy released in chemical reactions varies depending on the specific reaction. Some reactions release a lot of energy, while others release less or even absorb energy. This energy release or absorption is known as the reaction's enthalpy change.
What do chemical changes always take in or give off?
Some reactions give off heat (exothermic), others absorb heat (endothermic). All reactions increase entropy.
What two kinds of energy changes can take place during a chemical reaction?
Two types of energy changes that can occur in a chemical reaction are (1) endothermic and (2) exothermic. Endothermic is where energy is added to the system and exothermic is where energy is given off by the system.
When you mix two substances in a beaker and expect them to undergo a chemical change the temperature of the mixture does not change has a chemical change occurred?
Yes, a chemical change can still occur without a noticeable change in temperature. Some chemical reactions are endothermic (absorb heat) and others are exothermic (release heat), so observing a change in temperature is not always a reliable indicator of a chemical change taking place. Other signs to look for include color changes, gas production, formation of a precipitate, or the release of light.
Why some reactions are endothermic or exothermic?
Put in a simple way, endothermic is when the chemical reaction "absorb" heat or the temperature of the mixture increases. On the other hand, exothermic is when the chemical reaction "free" heat and the temperature of the mixture decreases.
Do all oxidation reactions absorb or liberate heat?
Oxidation reactions can either absorb or liberate heat. It depends on the specific reaction and the molecules involved. Some oxidation reactions are exothermic, releasing heat, while others are endothermic, absorbing heat.
Are there different types of chemical reactions?
Yes, there are hundreds of different reactions, many of which can be very similar and others which are entirely unique.
What is a sentence using endothermic and exothermic?
Plants are endothermic because they use photosynthesis as their means of obtaining energy and endothermic means energy obtaining. A candle flame would be considered exothermic because it releases heat.
Are ions stable in chemical reactions?
Ions can be stable or unstable in chemical reactions, depending on their electronic configuration and the presence of other ions or molecules. Some ions are more stable than others due to their full outer electron shells, while others may react readily to achieve stability.
Which part of an atom plays a major role in chemical reactions?
Chemical reactions are a result of valence electron transfer and/or sharing. Valence electrons are located in the outer-most orbitals of the reactant elements. In a sense, though, you could say protons are also involved in chemical reactions. Although an element will never donate, accept, or share protons in a CHEMICAL reaction, they are part of the determination in an elements reactivity. Reactions that do involve protons are termed "nuclear reactions," and are not chemical reactions. In fact, a lot of the methods used to determine chemical reactions -- such as enthalpy -- cannot even be applied to nuclear reactions. Neutrons, like protons are involved in nuclear reactions, but never in chemical reactions. Hope this helps!
What laboratory evidence do you need to show that chemical reaction has taken place?
That depends very much on what reaction is taking place. For some reactions a thermometer is all you need. For others, such as titrations, you need some sort of indicator, such as Eriochrome Black T. Other reactions may require a manner of collecting gas, still others, such a precipitation reactions, may only require your eyes.
