jss 3 3nd term check point Chemistry

Which of the following is an example of an exothermic reaction?

Theory question

• Compare and contrast exothermic and endothermic reactions.
  a) Define both exothermic and endothermic reactions.
  b) Give one example of each.
  c) Describe how energy is transferred in each type of reaction.

• The reactivity of metals varies across the periodic table.
  a) Define the reactivity series of metals.
  b) Arrange the following metals in order of reactivity: Iron, Magnesium, Potassium, and Copper.
  c) Explain why potassium is more reactive than iron.

• Acids react with bases to form salts.
  a) What is a neutralization reaction?
  b) Write the balanced chemical equation for the reaction of sulfuric acid with sodium hydroxide.
  c) Explain the importance of neutralization reactions in daily life.

• The activity series of metals determines their reactivity.
  a) Define the activity series of metals.
  b) Describe how the activity series helps to predict displacement reactions.
  c) Predict what will happen when zinc metal is placed in copper(II) sulfate solution. Write a balanced chemical equation for the reaction.

• Acids react with metals to form salts and hydrogen gas.
  a) Write the general reaction between an acid and a metal.
  b) Predict the products when magnesium reacts with hydrochloric acid.
  c) Explain why some metals, like copper, do not react with acids.

• Melting of ice

• Photosynthesis

• Combustion of fuel

• Boiling of water

An endothermic reaction is a reaction that:

• Releases heat

• Absorbs heat

• Produces light

• Releases gases

Which of the following is an endothermic process?

• Freezing of water

• Burning of wood

• Cooking an egg

• Condensation of steam

The reaction between sodium and water is:

• Endothermic

• Exothermic

• Neutral

• Non-reactive

Which of the following metals is the most reactive?

• Copper

• Gold

• Sodium

• Silver

The reactivity of metals increases as we move:

• Up the periodic table

• Down Group 1

• Left to right across the periodic table

• From transition metals to noble gases

In the activity series, which metal is placed above all others?

• Gold

• Zinc

• Potassium

• Silver

The activity series of metals ranks metals based on their:

• Atomic mass

• Ability to conduct electricity

• Reactivity

• Number of valence electrons

Which of the following metals reacts violently with water?

• Iron

• Lead

• Potassium

• Copper

Which metal does not react with dilute acids?

• Zinc

• Magnesium

• Copper

• Calcium