First Semester Exam Review

Front

What is the overall charge when there are 5 protons, 4 electrons, and 5 neutrons?

Back

The overall charge is +1 because protons are positively charged and electrons are negatively charged. 5 protons (+5) - 4 electrons (-4) = +1.

Front

What group number are the halogens found?

Back

The halogens are found in group 17 (7A) of the periodic table.

Front

What does the periodic law state about the arrangement of elements?

Back

Periodic law states that the elements are arranged according to their atomic numbers so that elements with similar chemical properties are in the same column and properties repeat periodically.

Front

What is the item that is altered by the scientist in an experiment called?

Back

The item that is altered by the scientist in an experiment is called the independent variable.

Front

What is the charge of a proton?

Back

The charge of a proton is +1.

Front

What is the charge of an electron?

Back

The charge of an electron is -1.

Front

What is a neutron?

Back

A neutron is a subatomic particle found in the nucleus of an atom that has no charge (neutral).

Front

What is the difference between independent and dependent variables?

Back

The independent variable is the one that is changed or controlled in an experiment, while the dependent variable is the one that is measured or affected.

Front

What is the atomic number of an element?

Back

The atomic number of an element is the number of protons in the nucleus of an atom.

Front

What is the significance of group numbers in the periodic table?

Back

Group numbers indicate the number of valence electrons in the elements of that group, which determines their chemical properties.