Counting atoms
Flashcard
•
Science
•
7th Grade
•
Practice Problem
•
Easy
Standards-aligned
Matt Callender
Used 1+ times
FREE Resource
Student preview
26 questions
Show all answers
1.
FLASHCARD QUESTION
Front
How many Hydrogen are in 4H2O?
Back
8
Answer explanation
In 4H2O, each water molecule (H2O) contains 2 hydrogen atoms. Therefore, 4H2O has 4 x 2 = 8 hydrogen atoms. The correct answer is 8.
Tags
NGSS.MS-PS1-1
2.
FLASHCARD QUESTION
Front
How many Oxygen are in H2O?
Back
1
Answer explanation
In H₂O, there is 1 oxygen atom. The chemical formula indicates that for every 2 hydrogen atoms, there is 1 oxygen atom, making the correct answer 1.
Tags
NGSS.MS-PS1-1
3.
FLASHCARD QUESTION
Front
How many Magnesium are in 10MgCl2?
Back
10
Answer explanation
In the compound 10MgCl2, the 'Mg' represents magnesium. Since there are 10 units of MgCl2, there are 10 magnesium atoms present. Therefore, the correct answer is 10.
Tags
NGSS.MS-PS1-1
4.
FLASHCARD QUESTION
Front
Number of H in 3(NH₄)₂CrO₄
Back
24
Answer explanation
In 3(NH₄)₂CrO₄, each NH₄ has 4 H atoms. There are 2 NH₄ groups per formula unit, giving 8 H atoms. Since there are 3 formula units, the total is 3 x 8 = 24 H atoms. Thus, the correct answer is 24.
Tags
NGSS.MS-PS1-1
5.
FLASHCARD QUESTION
Front
How many atoms are there TOTAL in: H2SO4?
Back
7
Answer explanation
H₂SO₄ consists of 2 hydrogen (H) atoms, 1 sulfur (S) atom, and 4 oxygen (O) atoms. Adding them together: 2 + 1 + 4 = 7. Therefore, the total number of atoms in H₂SO₄ is 7.
Tags
NGSS.MS-PS1-1
6.
FLASHCARD QUESTION
Front
How many elements are in C6H12O6?
Back
3
Answer explanation
C6H12O6 contains three different elements: carbon (C), hydrogen (H), and oxygen (O). Therefore, the correct answer is 3.
Tags
NGSS.MS-PS1-1
7.
FLASHCARD QUESTION
Front
How many Nitrogen atoms are in (NH₄)₂CrO₄?
Back
2
Answer explanation
In (NH₄)₂CrO₄, there are 2 ammonium ions (NH₄) per formula unit. Each ammonium ion contains 1 nitrogen atom, so there are 2 nitrogen atoms total in the compound.
Tags
NGSS.MS-PS1-1
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