restest 1 unit 7

Strips of Metal Y are added to solutions of zinc nitrate, copper ሺIIሻ nitrate, and lead ሺIIሻ nitrate. According to the results of the experiments shown in the figure below, which must be true?

• Cu is more active than Y

• Zn is more active than Y

• Pb is more active than Y

• Y is the most active metal shown

Which of the following models of a chemical reaction BEST represents the law of conservation of mass?

• Reaction I

• Reaction II

• Reaction III

• Reaction IV

In any oxidation-reduction ሺredoxሻ reaction, the total number of electrons gained is…

• unrelated to the total number of electrons lost

• equal to the total number of electrons lost

• . less than the total number of electrons lost

• greater than the total number of electrons lost

Which of the following is a redox reaction?

• 2 AlPO4 + 3Mg --> 2Al + Mg3(PO4)2

• 2 HCl + Mg(OH)2 --> 2H20 + MgCl2

• 2 NaCl + H2SO4 → Na2SO4 + 2 HCl

• HCl + NaOH → H2O + NaCl

. A clean strip of copper is dipped into a solution of magnesium sulfate. Which observation below is most likely to occur under ideal conditions based on the activity series of metals?

• Bubbles of hydrogen gas appear on the copper

• The copper strip becomes magnesium-plated

• Copper dissolves and the solution turns blue

• No reaction occurs therefore no changes are observed

Which of the following is a OXIDATION reaction?

• A

• F

• D

• E

What is an spectator ion?

• Ions that are present in the chemical equation but not part of the chemical reaction

• Ions that are present in both chemical equation and reaction

• Non metals that make the reaction happen

• Metals tha cause a reaction when combined with non metals

What is a precipitate?

• A liquid that forms at the end of the reaction

• A solid that is formed when two solids react

• A solid that is formed when two aqueous solutions react

• Helps speed up the reaction

Which of the following substances COULD NOT be a precipitate formed during a reaction between two aqueous solutions? (LOOK AT SOLUNILITY RULES)

• Lead (II) Sulfate

• Silver Bromide

• Rubidium Hydroxide

• Barium Phosphate

What does OIL RIG represent

• Oxidazing is lot more. Reducing is games

• Oxidation is Less. Reduction is Gain

• Oxidation is Loosing protons. Reduction is gaining protons

• Oxidation is Loosing electrons. Reduction is gaining electrons