Chemistry1 - Sem1 Final Exam Study Guide

Front

What is electronegativity?

Back

Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons.

Front

What is the trend in electronegativity down a group/family?

Back

Electronegativity decreases down a group/family.

Front

What is an isotope?

Back

Isotopes are atoms of the same element that have a different number of neutrons.

Front

How can you tell two atoms are isotopes of each other?

Back

You can tell them apart by the difference in their mass numbers.

Front

What is the difference between accuracy and precision?

Back

Accuracy is how close measurements are to the accepted value; precision is how close measurements are to one another.

Front

How do you calculate the average atomic mass of an element?

Back

Take the mass of each isotope multiplied by its relative abundance (in decimal form), and then add these products together.

Front

What are significant figures?

Back

Significant figures are the digits in a number that contribute to its precision.

Front

How many significant figures are in the number 356?

Back

3 significant figures.

Front

What is the atomic number of an element?

Back

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

Front

What is the mass number of an atom?

Back

The mass number is the total number of protons and neutrons in an atom's nucleus.