Chemistry Day 1

Front

What is an element in chemistry?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. It consists of atoms that all have the same number of protons.

Front

How many elements are present in the compound Mg2As3COHNi2?

Back

There are 6 elements present: Magnesium (Mg), Arsenic (As), Carbon (C), Oxygen (O), Hydrogen (H), and Nickel (Ni).

Front

What is the chemical formula for hydrazine?

Back

The chemical formula for hydrazine is N2H4.

Front

How do you determine the number of different elements in a chemical formula?

Back

Count the unique symbols in the formula. Each unique symbol represents a different element.

Front

What is the chemical formula for a compound containing 1 atom of nickel and 2 atoms of fluorine?

Back

The chemical formula is NiF2.

Front

What distinguishes a compound from an element?

Back

A compound is a substance formed when two or more elements are chemically bonded together, while an element is a pure substance that cannot be broken down.

Front

What is the significance of subscripts in a chemical formula?

Back

Subscripts indicate the number of atoms of each element in a molecule. For example, in H2O, the '2' indicates there are two hydrogen atoms.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together, which can be of the same or different elements.

Front

What is the difference between a compound and a mixture?

Back

A compound is a substance formed from two or more elements chemically bonded together, while a mixture is a combination of two or more substances that are not chemically bonded.

Front

What is the chemical formula for water?

Back

The chemical formula for water is H2O.