Chapter 7 and 10 Review

The substances that undergo change in a chemical reaction are called

• reactants

• products

• coefficients

• elements

In a compound, chemical energy is contained in the

• nuclei of the atoms

• unbonded electrons

• bonds

• movement of the electrons

The chemical equation shows the reaction that produces water from hydrogen and oxygen

2H₂ + O₂ --> 2H₂O + 483.6 kJ

Which BEST describes this reaction?

• exothermic

• endothermic

• decomposition

• single replacement

How many moles are in a 5.00 gram sample of copper?

• 0.0154 moles

• 0.0787 moles

• 12.7 moles

• 317 moles

When radium-226 decays to form radon-222, the radium nucleus emits a(n)

• alpha particle

• beta particle

• gamma ray

• electron

The half-life of a radioisotope is the amount of time it takes for

• half the sample to decay

• all the sample to decay

• the age of an artifact to be calculated

• detectable radiation to be absorbed by a sample

Which of these BEST describes the energy transformation involved in nuclear reactions

• the energy released in nuclear reactions is small

• the energy released in nuclear reactions is large

• the energy required in nuclear reactions is small

• the energy required in nuclear reactions is large

What coefficients will balance the equation

_____SO₃ + ____H₂O --> ____H₂SO₄

• 1-2-1

• 2-1-1

• 1-2-2

• 1-1-1

What type of equation has the general form of

A + BX --> AX + B

• synthesis

• decomposition

• single replacement

• double replacement

Classify the equation as

• synthesis

• decomposition

• single replacement

• double replacement