12 Questions
What is the molar mass (Mr) of iron?
56 g/mol
How many moles are there in 42 g of carbon?
3.5 mol
What is the Avogadro constant?
6.02 x 10^23 particles/mol
According to the balanced equation Mg + 2HCl -> MgCl2 + H2, how many moles of HCl react with 1 mol of Mg?
2 mol
What is the relationship between the total moles of elements on the reactant and product sides of a balanced chemical equation?
The total moles of elements must be the same on each side.
Which of the following equations correctly shows the relationship between moles, mass, and molar mass?
Both a and b are correct
Which statement about the law of conservation of mass is true?
The total mass of the reactants equals the total mass of the products.
What is the relative formula mass (Mr) of a compound?
The sum of the relative atomic masses of all atoms in the compound's formula.
In a balanced chemical equation, what is true about the sum of the relative formula masses?
The sum of Mr of reactants equals the sum of Mr of products.
Why might a reaction appear to involve a change in mass?
A reactant or product is a gas, and its mass was not accounted for.
What is the unit used to measure chemical amounts?
Mole (mol)
What is the relationship between the mass of one mole of a substance and its relative formula mass?
The mass of one mole is numerically equal to its relative formula mass in grams.
Test your knowledge on the law of conservation of mass in chemical reactions and the concept of balanced chemical equations. Understand how to ensure that the total mass of the products equals the mass of the reactants. Explore the calculation of relative formula mass in compounds.
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