Chemistry Quiz

What is an element?

• A mixture of substances

• A substance that can be broken down by chemical reactions

• A substance that cannot be broken down by chemical reactions

• A compound of two or more elements

What is a compound?

• A single element

• A mixture of gases

• A substance consisting of two or more different elements combined in a fixed ratio

• A solution of metals

Which of the following elements make up 96% of living matter?

• Carbon, oxygen, hydrogen, nitrogen

• Phosphorus, sulfur, calcium, potassium

• Sodium, chlorine, magnesium, iron

• Helium, neon, argon, krypton

What determines the properties of an element?

• The number of protons

• The structure of its atoms

• The type of chemical bonds

• The temperature and pressure

What is the atomic number?

• The number of electrons

• The number of neutrons

• The number of protons

• The sum of protons and neutrons

What is a polar covalent bond?

• Electrons are shared equally

• Electrons are transferred completely

• Electrons are shared unequally, depending on the relative electronegativity

• Electrons are not involved

What type of bond forms when a hydrogen atom covalently bonds to one electronegative atom and is also attracted to another electronegative atom?

• Ionic Bond

• Covalent Bond

• Hydrogen Bonding

• Van der Waals Interactions

Which interaction is responsible for the ability of a gecko to walk up a wall?

• Ionic Bond

• Covalent Bond

• Hydrogen Bonding

• Van der Waals Interactions

What is the shape of a molecule with two atoms, such as H2 or O2?

• Bent

• Linear

• Tetrahedral

• Trigonal Planar

What is the primary molecule that supports all life?

• Oxygen

• Carbon Dioxide

• Water

• Glucose