Chemical Equations and Counting Atoms Review

Why is the following chemical equation not balanced?
H_{2 +} O₂ --> H₂O

• each side of the equation has a different number of oxygen atoms
• each side of the equation has a different number of hydrogen atoms
• each side has the same mass

Tags

NGSS.MS-PS1-5

How many atoms of aluminum are on each side of the following equation: 4Al + 3O₂ --> 2Al₂ O₃

• 2
• 6
• 1
• 4

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-1

What is the part of the chemical equation in green called? 
Fe + S --> FeS

• products
• reactants
• yield
• chemical formula

What is a chemical equation?

• A short way to show a chemical reaction using symbols
• A way to explain a chemical reaction using words

Tags

NGSS.MS-PS1-5

Which of the following is an unbalanced equation?

• CaCO_3 --> CaO + CO_2
• PbO_2 + 2H_2-->2Pb + H_2O
• 2Na+ 2H_2O-->2NaOH + H_2
• CS_2 + 2O_2 --> CO_2 + 2SO_2

Tags

NGSS.MS-PS1-5

When balancing equations what does
 -->
mean?

• subscript
• equals
• it is just an arrow
• yield

In a chemical equation, the substances that are on the right side of the arrow are the...

• reactants
• products
• catalysts
• inhibitors

Tags

NGSS.MS-PS1-5

Which of the following is a sign that a chemical reaction has occurred?

• change in shape
• melting
• formation of a gas
• dissolving

Tags

NGSS.MS-PS1-2

How many elements are in C₆H₁₂O₆?

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS1-1

How many atoms of carbon (C) are in  C₆H₁₂O₆?

• 3
• 6
• 12
• 24

Tags

NGSS.MS-PS1-1