Chemistry Basics

What is the definition of chemistry?

• Art of painting

• Mathematical study of shapes

• Scientific study of matter composition and properties

• Study of weather patterns

Name three branches of chemistry.

• organic chemistry, inorganic chemistry, physical chemistry

• biochemistry

• environmental chemistry

• analytical chemistry

What is a chemical reaction?

• A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

• A chemical reaction is a mathematical equation.

• A chemical reaction is a biological process.

• A chemical reaction is a physical change in matter.

Explain the Law of Conservation of Mass.

• Mass can be transformed into energy in a closed system

• Mass can be destroyed in an open system

• Mass can be created in a closed system

• In a closed system, mass cannot be created or destroyed, only transformed from one form to another.

How many elements are there in the periodic table?

• 92

• 118

• 150

• 120

What is the atomic number of an element?

• Number of protons

• Number of isotopes

• Number of electrons

• Number of neutrons

What is the symbol for Gold on the periodic table?

• Au

• Fe

• Pt

• Ag

What are the three main particles of an atom?

• Protons, electrons, photons

• Neutrons, positrons, electrons

• Protons, neutrons, electrons

• Protons, electrons, quarks

What is the difference between an element and a compound?

• An element is always a liquid, while a compound can be a solid, liquid, or gas.

• An element can be broken down into simpler substances, while a compound cannot.

• An element consists of only one type of atom, whereas a compound consists of two or more different types of atoms bonded together.

• An element is a mixture of atoms, while a compound is a mixture of molecules.

Define an acid and give an example.

• An acid is a chemical substance that donates a proton or accepts an electron pair in reactions. An example of an acid is hydrochloric acid (HCl).

• An acid is a chemical substance that accepts a proton in reactions. An example of an acid is sodium chloride (NaCl).

• An acid is a type of base that neutralizes solutions. An example of an acid is sulfuric acid (H2SO4).

• An acid is a type of metal that reacts with water. An example of an acid is iron (Fe).