TIA - Chemical Equations

Which is a physical change? (TEKS 9(A))

• Rusting of iron

• Burning of wood

• Melting of ice

• Digestion of food

Answer explanation

Tags

NGSS.MS-PS1-4

What coefficients balance this equation in the picture? (TEKS 9(B))

• 1, 1, 1

• 1, 2, 2

• 2, 2, 1

• 2, 1, 2

Answer explanation

Tags

NGSS.HS-PS1-7

The reaction Zn + CuSO₄ → ZnSO₄ + Cu is an example of— (TEKS 9(C))

• Synthesis

• Decomposition

• Single replacement

• Double replacement

Answer explanation

We have an element and compound on both sides of the arrow. The bonded and free cation also switch places, making this a SINGLE REPLACEMENT REACTION.

What gas is produced when Na reacts with H₂O? (TEKS 9(D))

• O₂

• H₂

• CO₂

• N₂

Answer explanation

Which indicates a chemical change? (TEKS 9(A))

• Change in shape

• Formation of a gas

• Change in size

• Change in density

Answer explanation

Tags

NGSS.MS-PS1-2

Which process involves a chemical change rather than a physical one? (TEKS 9(A))

• Sublimation of dry ice

• Electrolysis of water into H₂ and O₂

• Condensation of steam

• Dissolution of sugar in water

Answer explanation

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What coefficients balance this equation: ​ (a)   C₃H₈ + ​ (b)   O₂ → ​ (c)   CO₂ + ​ (d)   H₂O ? (TEKS 9(B))

• 1
• 5
• 3
• 4
• 2
• 6

Answer explanation

A substance reacts with oxygen to form a new compound and releases energy. This indicates— (TEKS 9(A))

• A) A physical change due to phase transition

• B) A chemical change due to new substance formation

• C) A physical change due to energy absorption

• D) A nuclear change due to isotope formation

Tags

NGSS.HS-PS1-4

Which of the following is a balanced chemical equation describing the formation of carbon dioxide?

• C₂ + O₂ ↔ CO₂

• H₂ + 2C₂ ↔ CO₂

• 2O₂ + C₂ ↔ 2CO₂

• 2C₂ + 2O₂ ↔ 2CO₂

Tags

NGSS.HS-PS1-7

In the chemical reaction below, what are the correct coefficients?
Cu(s) + ​ (a)   AgNO₃ (aq) → Cu(NO₃)₂ (aq) + ​ (b)   Ag (s)

• 2
• 1
• 3
• 4

Answer explanation

Tags

NGSS.HS-PS1-7