Solving Chemistry Equations: A Guide for Homework

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In summary, the conversation discusses various questions and equations related to stoichiometry, specifically the reaction between two solutions with the same molarity. The first two questions ask for the correct equation representation in the smallest whole number ratio, while the last two questions involve determining the combined mass of a crucible and combustion product after burning iron. The overall goal is to understand how to calculate the molar ratio in a chemical reaction. The conversation also mentions the presence of experimental error in measurements.
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Homework Statement


1.It takes 15 drops of solution A to react completely with 29 drops of solution B? Which equation below represents this reaction in the smallest whole number ratio? Assume that solution A and solution B have the same molarity.

Remember that there is always a slight amount of experimental error in any measurement.

a)A + 2B
b)2A + B
c)A + B
d)14 A + 7B
e)7A + 14B

2.It takes 25 drops of solution A to react completely with 17 drops of solution B? Which equation below represents this reaction in the smallest whole number ratio? Assume that solution A and solution B have the same molarity.

Remember that there is always a slight amount of experimental error in any measurement.

a)A + 2B
b)2A + 3B
c)24A + 17B
d)2A + B
e)17A + 24B
f)3A + 2B

3.After drying and cooling your crucible, you determine that it has a mass of 20.633 grams. You place a sample of iron in the crucible. The overall mass of the crucible and iron is 27.396 grams. You burn the iron sample in the crucible. Assuming that the combustion of iron metal results in the formation of FeO, what is the combined mass of the crucible and the combustion product in grams?

4.After drying and cooling your crucible, you determine that it has a mass of 22.385 grams. You place a sample of iron in the crucible. The overall mass of the crucible and iron is 26.932 grams. You burn the iron sample in the crucible. Assuming that the combustion of iron metal results in the formation of FeO, what is the combined mass of the crucible and the combustion product in grams?

Homework Equations



Stoichiometry?

The Attempt at a Solution



I'm pretty lost with these problems, i do not know how to reason with them.
 
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Well ... how many hydrogens do you need for each oxygen to get water?
If I had oxygen and hydrogen in solution (with something, somehow), at the same molar concentrations, how many drops of hydrogen solution do I need for each drop of oxygen?
How would you write down the equation for that chemical reaction?

Remember that there is always a slight amount of experimental error in any measurement.
This is the lynchpin - what does it mean?
 

1. What are the basic steps for solving chemistry equations?

The basic steps for solving chemistry equations are:
1. Write out the chemical equation using the correct symbols and formulas.
2. Balance the equation by making sure there are equal numbers of atoms on both sides.
3. Identify the type of reaction (ex. synthesis, decomposition, single or double replacement)
4. Apply any necessary rules or guidelines for the specific type of reaction.
5. Solve for the unknown variable or product using algebraic manipulation.
6. Check your answer by making sure the equation is still balanced and all units are correct.

2. How do I know if an equation is balanced?

An equation is considered balanced if there are equal numbers of atoms on both sides. This means that the total number of each type of atom (ex. carbon, hydrogen, oxygen) must be the same on both the reactant and product sides of the equation. You can check this by counting the number of each type of atom and making sure they are equal on both sides.

3. What is the purpose of balancing equations in chemistry?

The purpose of balancing equations in chemistry is to accurately represent the reactants and products in a chemical reaction. Balancing equations ensures that the law of conservation of mass is followed, which states that the total mass of the reactants must equal the total mass of the products in a chemical reaction.

4. Are there any shortcuts for balancing equations?

While there are no shortcuts for balancing equations, there are some tips and tricks that can make the process easier. For example, start by balancing elements that appear in only one reactant and one product, and then move on to elements that appear in multiple reactants and/or products. Additionally, try using fractions or coefficients of 1 to balance elements instead of changing the entire equation.

5. What should I do if I can't balance an equation?

If you are having trouble balancing an equation, double check that you have written the correct formulas and symbols for each substance. If everything appears to be correct and you are still unable to balance the equation, try breaking it down into smaller steps or seeking help from a classmate or instructor.

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