Chemistry Semester 1 Pre-Test On Level

Front

What is the empirical formula of C6H12O6?

Back

CH2O

Front

Which element is a noble gas?

Back

Helium

Front

What does the law of conservation of energy state?

Back

Energy cannot be created or destroyed; it can only change forms.

Front

What is the charge and mass comparison of an electron to a proton?

Back

Electrons have a negative charge and a mass approximately 1/1836 that of a proton.

Front

What happens to metallic character across a period in the periodic table?

Back

Elements become less metallic and more nonmetallic across a period.

Front

Define 'molecular formula'.

Back

A molecular formula shows the number and type of atoms in a molecule.

Front

What is an 'empirical formula'?

Back

An empirical formula is the simplest whole-number ratio of atoms in a compound.

Front

What is the significance of the periodic table's periods?

Back

Periods indicate the number of electron shells in the elements.

Front

What is the charge of a proton?

Back

Protons have a positive charge.

Front

What is the difference between an element and a compound?

Back

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