chemical equation

How many oxygen atoms are present in the following? 
4Ca(OH)₂

• 4
• 6
• 8
• 1

Tags

NGSS.MS-PS1-1

 Fill in the blank to balance the chemical equation. 
2KI  +  ____Cl₂ →  2KCl  +  I₂

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS1-5

What state of matter is this substance?

• solid

• liquid

• gas

• aqueous

Tags

NGSS.HS-PS1-3

NGSS.HS-PS1-5

Identify the number in blue.

• Product

• Reactant

• Coefficient

• Subscript

Tags

NGSS.MS-PS1-1

When balancing this equation, Fe + Cl₂ → FeCl₃, the correct coefficient for Cl₂?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5

What does this symbol Δ above the arrow mean?

• a precipitate is form

• heat is supplied

• a calalyst is needed

• electricity is needed

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Balance this equation, CaCO₃(s) → CaO(s) + CO₂(g)?

• 3,1,2

• 1,1,1

• 1,3,1

• 2,6,3

Tags

NGSS.MS-PS1-5

How many molecules of Carbon are in the following formula? 3C₂H₆

• 3
• 6
• 12
• 18

Tags

NGSS.MS-PS1-1

Magnesium can be burned in air to produce solid magnesium oxide.

• 2Mg(s) + O₂(g)→ 2MgO(s)
• Mg(s) + O(g) → MgO(s)
• 2Mg(s) + CO₂(g) → 2MgO(s) + C(s)
• 2Mg(s) + O₂(g) → Mg₂O₂(s)

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-4

Sodium reacts with chlorine to produce sodium chloride.

• NaCl(s) → Cl(g) + Na(s)
• Na(s) + CO₂(g) → NaCO₂(s)
• 2Na(s) + Cl₂(g) → 2NaCl(s)
• Na(s) + Cl(g) → NaCl

Tags

NGSS.HS-PS1-2