Chemistry Challenge

What is the smallest particle of an element that still retains its properties?

• cell

• proton

• molecule

• atom

What is the name of the force that holds atoms together in a molecule?

• chemical bond

• nuclear force

• magnetic force

• gravitational force

What are the properties of acids?

• Acids have a sweet taste, turn red litmus paper blue, and react with metals to produce oxygen gas.

• Acids have a bitter taste, turn blue litmus paper red, and react with metals to produce carbon dioxide gas.

• Acids have a salty taste, turn red litmus paper blue, and react with metals to produce nitrogen gas.

• Acids have a sour taste, turn blue litmus paper red, and react with metals to produce hydrogen gas.

What type of reaction occurs when two substances combine to form a new substance?

• Physical reaction

• Biological reaction

• Nuclear reaction

• Chemical reaction

What is the study of heat and energy in chemical reactions?

• Astronomy

• Biochemistry

• Thermochemistry

• Geology

What is the branch of chemistry that deals with the compounds of carbon?

• Inorganic chemistry

• Physical chemistry

• Organic chemistry

• Biochemistry

What is the total number of protons and neutrons in the nucleus of an atom?

• Mass number

• Electron number

• Atomic number

• Isotope number

What type of bond is formed when electrons are shared between atoms?

• Hydrogen bond

• Covalent bond

• Ionic bond

• Metallic bond

What is the pH of a neutral solution?

• 7

• 3

• 10

• 5

What is the process of breaking down complex substances into simpler substances?

• Combustion

• Synthesis

• Decomposition

• Oxidation