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Conservation of Mass and Balanced Chemical Equations Quiz

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Conservation of Mass and Balanced Chemical Equations Quiz

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Questions and Answers

What is the molar mass (Mr) of iron?

28 g/mol

12 g/mol

56 g/mol (correct)

6.02 x 10^23 g/mol

How many moles are there in 42 g of carbon?

42 mol

12 mol

0.5 mol

3.5 mol (correct)

What is the Avogadro constant?

6.02 x 10^23 particles/mol (correct)

6.02 x 10^12 particles/mol

6.02 x 10^18 particles/mol

6.02 x 10^3 particles/mol

According to the balanced equation Mg + 2HCl -> MgCl2 + H2, how many moles of HCl react with 1 mol of Mg?

2 mol Signup and view all the answers

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. Signup and view all the answers

Which of the following equations correctly shows the relationship between moles, mass, and molar mass?

Both a and b are correct Signup and view all the answers

Which statement about the law of conservation of mass is true?

The total mass of the reactants equals the total mass of the products. Signup and view all the answers

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. Signup and view all the answers

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. Signup and view all the answers

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. Signup and view all the answers

What is the unit used to measure chemical amounts?

Mole (mol) Signup and view all the answers

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. Signup and view all the answers