Counting Elements and Atoms 2

How many Hydrogen atoms are in 4H₂O?

• 6
• 8
• 2
• 4

How many Magnesium atoms are in 10MgCl₂?

• 10
• 5
• 20
• 12

A subscript is the small number below a(n) ________ that tells the number of _______ of that element.

• element symbol; atoms
• atom; element symbol
• subscript; protons
• compound; elements

Tags

NGSS.MS-PS1-1

If there is no subscript, there is ______ atom(s) of that element.

• 0
• 2
• only 1
• 1 million

Tags

NGSS.MS-PS1-1

How many atoms are in the element Carbon in this compound?
H₂C₃O₄N₅

• 2
• 3
• 4
• 5

Tags

NGSS.MS-PS1-1

How many TOTAL atoms are in this compound?
H₂C₃O₄N₅

• 5
• 14
• 15
• 19

Tags

NGSS.MS-PS1-1

How many elements are present in this compound?
Mg₂As₃COHNi₂

• 2
• 4
• 6
• 10

Tags

NGSS.MS-PS1-1

an electron has this charge

• positive
• negative
• neutral

a neutron has this charge

• negative
• positive
• neutral

Balance this equation...
Sb₂S₃ + O₂ --> Sb + SO₂

• It is balanced
• Sb₂S₃ + 3O₂ --> 2Sb + 3SO₂
• Sb₂S₃ + O₂ --> 2Sb + SO₂
• I don't know...Oh well!