Introduction to Chemistry 1st Semester Review

Front

What is the region of the atom where the protons and neutrons are found?

Back

Nucleus

Front

How many neutrons are found in an atom of Manganese with a mass number of 55?

Back

30

Front

What is the chemical formula for calcium nitrate?

Back

Ca(NO₃)₂

Front

Which of the following is a chemical change? Letting the milk sit out overnight and waking up to find it soured.

Back

This is a chemical change because it involves a change in the chemical composition of the milk.

Front

What did Rutherford’s Gold Foil Experiment reveal about the nucleus of an atom?

Back

The nucleus is positively charged and has a high density.

Front

Define an atom.

Back

An atom is the smallest unit of an element that retains the properties of that element.

Front

What are protons?

Back

Protons are positively charged particles found in the nucleus of an atom.

Front

What are neutrons?

Back

Neutrons are neutral particles found in the nucleus of an atom.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is a chemical formula?

Back

A chemical formula is a way of expressing the composition of a substance using symbols for its constituent elements.