
Mastering Chemical Formulas Through The Criss-Cross Method

Interactive Video
•
Chemistry, Science, Other
•
9th - 10th Grade
•
Hard

Patricia Brown
FREE Resource
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10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the valency of Sodium (Na) in the compound Sodium Chloride (NaCl)?
-2
-1
+2
+1
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In the criss-cross method, what happens to the valencies of elements?
They are added together.
They are subtracted from each other.
They remain the same.
They are exchanged between the elements.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the valency of the sulphate radical (SO4) in Sodium Sulphate (Na2SO4)?
+2
-1
+1
-2
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How many sodium (Na) atoms are present in the formula of Sodium Sulphate (Na2SO4)?
4
3
2
1
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the valency of Iron (Fe) in Ferrous Sulphate (FeSO4)?
+1
+2
-2
-1
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In Ammonium Hydroxide (NH4OH), what is the valency of the hydroxide (OH) group?
+1
-1
+2
-2
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the valency of Zinc (Zn) in Zinc Sulphate (ZnSO4)?
+1
+2
-1
-2
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