Composition (Grade 10 NSC Matric Physical Sciences): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
In the formula , what does represent?
In the formula , what does represent?
Molar mass in g·mol⁻¹
Which is NOT one of the four main types of composition problems?
Which is NOT one of the four main types of composition problems?
Acid-base titrations
What formula calculates percentage by mass of an element?
What formula calculates percentage by mass of an element?
When finding an empirical formula, what do you divide each element's moles by?
When finding an empirical formula, what do you divide each element's moles by?
Smallest number of moles
How does a molecular formula relate to an empirical formula?
How does a molecular formula relate to an empirical formula?
Whole number multiple
In H₂SO₄, what percentage does oxygen contribute to the total mass?
In H₂SO₄, what percentage does oxygen contribute to the total mass?
65.23%
What are waters of crystallisation?
What are waters of crystallisation?
Water molecules trapped in crystals
A compound is 52.2% C, 13.0% H, 34.8% O. Its empirical formula is:
A compound is 52.2% C, 13.0% H, 34.8% O. Its empirical formula is:
C₂H₆O
What should percentage compositions always add up to?
What should percentage compositions always add up to?
100%
If empirical formula CH₂O has mass 30 g·mol⁻¹ and molar mass is 60 g·mol⁻¹, molecular formula is:
If empirical formula CH₂O has mass 30 g·mol⁻¹ and molar mass is 60 g·mol⁻¹, molecular formula is:
C₂H₄O₂