Chemistry S1 Review (without electron configurations)

Front

What is the most likely bond to occur between sodium and oxygen?

Back

Na2O (Sodium Oxide) is the most likely bond due to the common oxidation states of sodium (+1) and oxygen (-2).

Front

Which subatomic particle determines the identity of an element?

Back

Protons determine the identity of an element; the number of protons in the nucleus defines the element's atomic number.

Front

What type of reaction occurs when a solid changes to a liquid and then to a gas?

Back

This is an endothermic reaction, where energy is absorbed to change the state of matter.

Front

Which process is an example of an exothermic reaction?

Back

Water freezing to form ice is an exothermic process, as it releases energy in the form of heat.

Front

What makes up most of the mass in an atom?

Back

Most of the mass in an atom is made up of protons and neutrons.

Front

What is the definition of an endothermic reaction?

Back

An endothermic reaction is a chemical reaction that absorbs heat from its surroundings.

Front

What is the definition of an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases heat to its surroundings.

Front

What is the role of neutrons in an atom?

Back

Neutrons contribute to the mass of an atom and help stabilize the nucleus.

Front

What is the charge of protons?

Back

Protons have a positive charge.

Front

What is the charge of electrons?

Back

Electrons have a negative charge.