

L 39 Counting Atoms in Chemical Formulas
Presentation
•
Chemistry
•
11th - 12th Grade
•
Medium
Standards-aligned
Pema Wangdak
Used 8+ times
FREE Resource
3 Slides • 8 Questions
1
Counting Atoms in Chemical Formulas

2
Introduction
Chemical formula are used to represent the composition of elements and compounds
Qualitative information of a formula shows the types of atoms (or ions) that make up the substance.
Quantitative information of a formula shows how amhy of each atom (or ions) is in the formula. The number of each atom in a formula is shown with a subscript.
Subscript in a chemical formula is the whole number written on the bottom of each atom in a formula.
3
Examples
Co ..................... (cobalt)
CO ..................... (carbon monoxide)
H2O .................. (dihydrogen monoxide)
Ca(NO3)2............. (Calcium nitrate)
4
Multiple Select
How many atoms (in total) are found in the hydrate (NH4)3PO4*5H2O?
10
20
30
35
5
Multiple Select
How many different kinds of atoms are present in NH4NO3?
7
9
3
4
6
Multiple Select
How many Nitrogens are present in NH4NO3?
1
2
3
4
7
Multiple Select
How many atoms (total atoms) are present in NH4NO3?
7
8
9
10
8
Multiple Select
How many hydrogen atoms are found in the hydrate (NH4)3PO4*5H2O?
12
19
22
14
9
Multiple Select
How many different types of atoms are found in the hydrate (NH4)3PO4*5H2O?
6
5
3
4
10
Multiple Select
In the compound Al2S3 the mole ratio of Aluminum ion to sulfur ion is
2:3
3:2
13:16
27:16
11
Multiple Select
The ratio of ammonium ion to phosphate ion found in the hydrate (NH4)3PO4*5H2O is
1:1
1:2
3:1
3:5
Counting Atoms in Chemical Formulas

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