Chemistry Midterm Review

Front

Balance this equation: P4 + O2 --> ?

Back

P4 + 3 O2 --> 2 P2O3

Front

The melting of ice can be described as a __________

Back

physical change

Front

Electronegativity is...

Back

how good an atom is at attracting electrons

Front

What is the molar mass of CO2 to the ones place?

Back

44

Front

How many valence electrons does Phosphorus have?

Back

5

Front

Define a chemical change.

Back

A process where substances combine or break apart to form new substances.

Front

What is the law of conservation of mass?

Back

Mass is neither created nor destroyed in a chemical reaction.

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 together.

Front

What is the pH scale?

Back

A scale that measures how acidic or basic a solution is, ranging from 0 (acidic) to 14 (basic), with 7 being neutral.

Front

What is a mole in chemistry?

Back

A mole is a unit that measures the amount of substance, equivalent to 6.022 x 10^23 particles.