Counting Atoms and Chemical Reactions

How many Hydrogen are in 4H₂O?

• 8

• 6

• 4

• 2

How many elements are in C₆H₁₂O₆?

• 1

• 3

• 6

• 24

How many total atoms are in H₂SO₄?

• 3

• 5

• 6

• 7

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

• element symbol, atoms

• atom, element symbol

• subscript, protons

• compound, elements

What is a coefficient?

• the small number on the right of the chemical symbol

• the large number to the left of a formula

• the numbers inside of the parentheses

• the small number to the left of the chemical symbol

Tags

NGSS.MS-PS1-5

What is the total number of atoms present in 5Na₃PO₄?

• 55

• 40

• 8

• 5

What is the little number after an element in a chemical equation called? H₂

• Element

• Atom

• Coefficient

• Subscript

What does the Law of Conservation of Mass state?

• Matter cannot be gained or lost in a chemical reaction.
• Matter can only be lost in a chemical reaction.
• Matter can only be gained in a chemical reaction.
• Matter can be gained and lost in a chemical reaction. 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the left part of a chemical equation called?
2H_{2 +} O₂ --> 2H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

Tags

NGSS.MS-PS1-5

What is the right part of a chemical equation called...
2H_{2 +} O₂ --> 2H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

Tags

NGSS.MS-PS1-5