Physical Science Final Exam Review Practice

What is the atomic number of an element that has 6 protons and 6 neutrons?

• 18

• 12

• 24

• 6

What is the half-life of a substance if 25% of the original sample remains after 20 minutes?

• 20 minutes

• 10 minutes

• 40 minutes

• 30 minutes

What is the electron configuration of carbon?

• 1s2 2s1 2p3

• 1s2 2s2 2p2

• 1s2 2s2 2p3

• 1s2 2s1 2p2

How many valence electrons does an atom of chlorine have?

• 2

• 10

• 7

• 5

In a nuclear reaction, what is the process called when a heavy nucleus splits into two or more lighter nuclei?

• nuclear division

• atomic disintegration

• nuclear fission

• nuclear fusion

What is the balanced chemical equation for the reaction between hydrogen and oxygen to form water?

• 2H2 + O2 -> 2H2O

• H2 + O2 -> H2O

• 2H + O -> H2O

• H2O -> 2H2 + O2

What type of chemical reaction is represented by the following equation: 2H2 + O2 → 2H2O

• Single displacement reaction

• Combustion reaction

• Decomposition reaction

• Synthesis reaction

What is the atomic number?

• the number of protons in the nucleus

• the number of protons and neutrons in the nucleus

• the number of neutrons in the nucleus

• the number of protons in the energy levels

What is the mass number?

• the number of protons in the nucleus

• the number of protons and neutrons in the nucleus

• the number of neutrons in the nucleus

• the number of protons and electrons in the atom

What is the atomic number of this atom?

• 1

• 3

• 4

• 7