General quantities in chemical reactions questions

In summary, a high school student is seeking help on understanding quantities in chemical reactions, specifically how to calculate theoretical yield, determine the mass of the limiting reagent, and use stoichiometry. They also ask about obtaining the molecular formula and are directed to search for related posts on the forum.
  • #1
voodoomagic
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general "quantities in chemical reactions" questions

hi,

im in high school, and we are currently doing a unit of chemistry on quantities in chemical reactions, and there are a few things i don't get, and i was wondering if anyone could show me a formula or an example, on calculating the theoretical yield, how to get the mass of the limiting reagent, and stoichiometry.. and how do u get the molecular formula?

thanks a lot for any info :)
 
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  • #2
There are posts available in the forum, just search them with the engine. Then give some feedback with real questions, and we'll help you.
 

1. What are general quantities in chemical reactions?

General quantities in chemical reactions refer to the basic measurements and properties that are involved in a chemical reaction. These include the amount of reactants and products, the concentration of the reactants, the rate of the reaction, and the energy changes that occur.

2. How do you calculate the amount of reactants and products in a chemical reaction?

The amount of reactants and products in a chemical reaction can be calculated using the mole concept. This involves converting the mass of a substance to moles using its molar mass, and then using the mole ratios from the balanced chemical equation to determine the amounts of each substance involved.

3. What is the significance of concentration in a chemical reaction?

Concentration is an important factor in chemical reactions as it determines the rate at which the reaction occurs. A higher concentration of reactants means more particles available to react, leading to a faster rate of reaction. It also affects the equilibrium of the reaction, as a higher concentration of products can shift the equilibrium towards the reactants.

4. How does the rate of a chemical reaction change with temperature?

The rate of a chemical reaction generally increases with an increase in temperature. This is because at higher temperatures, the particles have more kinetic energy, leading to more frequent and energetic collisions between reactant molecules. This results in a faster rate of reaction.

5. What are the different energy changes that occur in a chemical reaction?

There are three types of energy changes that can occur in a chemical reaction: exothermic, endothermic, and activation energy. Exothermic reactions release energy in the form of heat, while endothermic reactions absorb energy. Activation energy is the minimum amount of energy required for a reaction to occur and is involved in breaking bonds between reactant molecules.

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