Combination and Decomposition Reactions (NCEA Level 1 90947)

A decomposition reaction can be represented as _____________________.

• AB  → A + B
• A + B → AB
• AB + CD → AC + BD
• A + BC → B + AC

A chemical change in which two substances react to form a new substance is a ____________________________.

• decomposition reaction

• Combination reaction

• precipitation reaction

• combustion reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which chemical reaction breaks down into 2 substances?

• Double displacement
• Single displacement
• Synthesis
• Decomposition

What state is calcium carbonate?

• gas

• liquid

• solid

• aqueous Solution

Tags

NGSS.MS-PS1-1

What colour is sodium hydrogen carbonate?

• white

• blue

• green

• yellow when hot

What happens when CO₂ is bubbled through limewater

• It changes from pink to blue

• It goes pop

• It goes cloudy

• It gets hot

Tags

NGSS.MS-PS1-2

metal hydroxide (+ heat) → ____________ + _________

• metal carbonate + water

• metal oxide + carbon dioxide

• carbon dioxide + water

• metal oxide + water

Tags

NGSS.HS-PS1-7

NaHCO₃ decomposes when heated to give _____ _____, carbon dioxide and water

• sodium oxide

• sodium carbonide

• sodium carbonate

• water and carbon dioxide

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-5

______________ (+ heat) → zinc oxide + carbon dioxide

• zinc carbonate

• zinc oxide

• zinc dioxide

• zinc hydrogen carbonate

Two Reactants and One Product

• Decomposition
• Combination
• Combustion
• Single Replacement