
Cross-Over Method for Chemical Formulas
Authored by Glau Serralvo
Chemistry
9th Grade
Used 2+ times

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18 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the first step in the cross-over method for writing chemical formulas?
Write the formula with charges included.
Write the ions with their charges.
Simplify the subscripts.
Cross over the charges.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does the cross-over step in the method involve?
Adding the charges of the ions.
Subtracting the charges of the ions.
Using the charge of one ion as the subscript for the other ion.
Multiplying the charges of the ions.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the correct formula for sodium chloride (Na⁺ and Cl⁻)?
Na₂Cl
NaCl
NaCl₂
Na₂Cl₂
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the formula for magnesium oxide (Mg²⁺ and O²⁻)?
Mg₂O₂
MgO₂
MgO
Mg₂O
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How would you write the formula for calcium nitrate (Ca²⁺ and NO₃⁻)?
CaNO₃
Ca₂(NO₃)₂
Ca(NO₃)₂
Ca₂NO₃
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the correct formula for aluminum oxide (Al³⁺ and O²⁻)?
Al₂O₃
AlO₂
Al₃O
Al₃O₂
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the formula for potassium fluoride (K⁺ and F⁻)?
KF₂
KF
K₂F
K₂F₂
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