SPS3

Hydrazine (N₂H₄) is a chemical compound used in rocket fuel. Which of the following represents the correct balanced equation for the reaction of hydrazine liquid with oxygen gas to produce nitrogen gas and steam?

• N₂H₄ + O₂  N₂ + H₂O

• N₂H₄ + O₂  N₂ + 2H₂O

• N₂H₄ + 2O₂  N₂ + H₂O

• N₂H₄ + 2O₂  2N₂ + H₂O

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

An unbalanced chemical equation is shown below.

CH₄ + O₂  → CO₂ + H₂O

Which is the correctly balanced equation for the expression?

• CH₄ + 2O₂ → CO₂ + H₂O

• CH₄ + 3O₂ → CO₂ + H₂O

• 2CH₄ + O₂ → CO₂ + H₂O

• CH₄ + 2O₂ → CO₂ + 2H₂O

Tags

NGSS.MS-PS1-5

Potassium chloride can be produced from potassium metal and chlorine gas. Which of the following is the correct, balanced equation for the production of potassium chloride?

• 4K(s) + Cl₂(g) → 2K₂Cl(s)

• K(s) + Cl₂(g) → KCl(s)

• 2K(s) + Cl₂(g) → 2KCl(s)

• K(s) + Cl₂(g) → KCl₂(s)

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

An unbalanced chemical equation is shown below.

NO + O₂ → NO₂

Which is the correctly balanced equation for the expression?

• NO + O₂ → 3NO₂

• NO + 2O₂ → 2NO₂

• 2NO + O₂ → 2NO₂

• 2NO + O₂ → NO₂

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

During combustion, methane yields carbon dioxide and water. The unbalanced equation for this reaction is:

CH₄ + O₂ CO₂ + H₂O

What coefficients are needed in order to balance this equation?

• 1, 1, 1, 2

• 1, 2, 1, 2

• 5, 4, 3, 6

• 1, 1, 2, 1

Tags

NGSS.MS-PS1-5

A sample of copper powder is heated in an evaporating dish using a Bunsen burner. If the mass of the powder in the evaporating dish increases after heating, this indicates that

• hot copper weighs more than cold copper.

• hot copper is more dense than cold copper.

• 
  the copper must have combined with another substance.

• the copper must have lost matter.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Li+s->Li2S

• 1,2,2

• 3,3,1

• 2,1,1

• 1,3,2

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

An unbalanced chemical equation is shown below.

Al + O₂ → Al₂O₃

Which is the correctly balanced equation for the expression?

• 4Al + O₂ → 2Al₂O₃

• 4Al + 3O₂ → 2Al₂O₃

• 3Al + 2O₂ → Al₂O₃

• 2Al + 3O₂ → Al₂O₃

Tags

NGSS.MS-PS1-5

Potassium (K) combines with magnesium bromide (MgBr₂) to form potassium bromide (KBr) and magnesium (Mg) during a chemical reaction.

Which of the following shows the balanced chemical equation for this reaction?

• 2K + MgBr₂->2KBr + Mg

• 2K + MgBr  -> 2KBr + Mg

• K + MgBr₂->KBr + Mg

• K + MgBr_2->KBr₂ + Mg

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

According to the law of conservation of mass, the mass of the reactants in a reaction must              the mass of the products in a reaction.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5