Fall Semester Exam 24-25

Front

What is the best lab equipment to measure a small precise amount of liquid?

Back

Graduated cylinder is the best lab equipment for measuring small precise amounts of liquid.

Front

What is the atomic radius of magnesium?

Back

The atomic radius of magnesium is 150 pm.

Front

What is the atomic radius of strontium?

Back

The atomic radius of strontium is 200 pm.

Front

What is the atomic radius of calcium in relation to magnesium and strontium?

Back

The atomic radius of calcium is between 150 pm and 200 pm.

Front

What is a Lewis Dot diagram?

Back

A Lewis Dot diagram is a representation of the valence electrons of an atom, showing how they are arranged in pairs around the atomic symbol.

Front

What should a student do if sodium hydroxide is swallowed?

Back

The student should call poison control and rinse his mouth.

Front

Who discovered the electron and when?

Back

The electron was discovered by J.J. Thomson in 1897.

Front

How did the discovery of the electron affect Dalton's atomic theory?

Back

The discovery of the electron led to modifications in Dalton's atomic theory, which originally proposed that atoms were indivisible.

Front

What is Dalton's atomic theory?

Back

Dalton's atomic theory states that all matter is made of atoms, which are indivisible and indestructible.

Front

What is the purpose of a graduated cylinder?

Back

A graduated cylinder is used to measure the volume of liquids accurately.