Chemistry Test 3 review

Which of the following metals is the most reactive according to the reactivity series of metals.

• Copper
• Zinc
• Magnesium 
• Lithium

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Based on the activity series, which metal could X represent in the reaction below?
X + Ca (NO₃)₂ -->  Ca + X (NO₃)₂

• Ba
• Fe
• Mg
• Zn

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What type of reaction occurs between an element and a compound?
Zn + 2HCl --> ZnCl₂ + H₂

• Synthesis
• Decomposition
• Single Replacement
• Double Replacement

Tags

NGSS.MS-PS1-2

What is the percent by mass of fluorine in CaF₂ (gram-formula mass = 78 g/mol)?

• 24%
• 49%
• 51%
• 65%

What is the percent composition on Oxygen in NO₂? (rounded)

• 40%
• 50%
• 60%
• 70%

A formula with the lowest whole # ratio of elements in a compound is called

• empirical formula
• chemical formula
• covalent formula
• molecular formula

A chemical formula that shows the actual # and kinds of atoms present in one molecule of a compound is called_________

• ionic formula
• covalent formula
• empirical formula
• molecular formula

C₆H₁₂

• Empirical
• Molecular

What is the empirical formula for the following molecular formula: C₅H₁₂

• C₅H₁₂
• CH₃
• CH₂
• C_2.5H₆

Which pair has the same empirical formula?

• NaCrO₄ and Na₂Cr₂O₇
• C₂H₄O₂ and C₆H₁₂O₆
• C₃H₆O₃ and C₂H₆O₂
• CH₄ and C₂H₆