2024 Chemistry Semester 1 Exam

Front

What is the Law of Conservation of Mass?

Back

Matter is not created nor destroyed.

Front

What is the formula to calculate mass from density and volume?

Back

Mass = Density × Volume.

Front

What is the mass of a 25 ml liquid if it has a density of 5 g/ml?

Back

125 g.

Front

How many elements are in the compound C2H8O?

Back

3.

Front

What is the charge of an ion that has 46 protons and 48 electrons?

Back

-2.

Front

What is the definition of an ion?

Back

An ion is an atom or molecule that has a net electric charge due to the loss or gain of one or more electrons.

Front

What is the molecular formula for water?

Back

H2O.

Front

How do you determine the number of oxygen atoms in Al(OH)3?

Back

Count the subscript of oxygen in the formula, which is 3.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

Front

What is the density of a substance if its mass is 50 g and its volume is 10 ml?

Back

Density = 5 g/ml.