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Chemistry Chapter 3 Quiz

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Questions and Answers

What is the formula weight of NaOH?

23 g

40 g (correct)

36 g

30 g

Why is the formula weight of NaCl not considered a molecular weight?

NaCl is a solid at room temperature.

It is too heavy to be a molecular weight.

It is not derived from atomic weights.

Molecules of NaCl do not exist since it is an ionic compound. (correct)

Which step is NOT part of deriving an empirical formula?

Divide by the smallest mole value.

Determine the percentage of each element. (correct)

Multiply to obtain whole numbers if necessary.

Convert grams to moles.

What mass does one mole of H2O have?

18.0 g Signup and view all the answers

Given 43.6% P and 56.4% O in a compound, what is the first step to find the empirical formula?

Base calculations on a 100 g sample. Signup and view all the answers

What does stoichiometry primarily deal with in chemical reactions?

Quantitative relationships between elements and compounds Signup and view all the answers

Which principle postulate distinguishes Dalton's atomic theory from earlier beliefs about matter?

Relative masses of atoms can be measured Signup and view all the answers

What does the law of conservation of mass state?

The mass of reactants equals the mass of products in a chemical reaction Signup and view all the answers

According to Dalton's theory, what causes a pure compound to maintain consistent proportions?

Combination of elements in the same ratios by mass Signup and view all the answers

What is the concept of the law of multiple proportions?

Elements can combine in various ratios to form different compounds Signup and view all the answers