Classifying Matter
Which of the following is a pure substance made of only one type of atom?
Oxygen (O₂)
Which subatomic particle has a positive charge and is found in the nucleus?
Proton
What does the atomic number of an element represent?
The number of protons in the atom
Which of the following is an example of a physical change?
Melting an ice cube
Which best describes a compound?
A substance made of atoms of two or more elements bonded together
Where are electrons located in an atom?
Surrounding the nucleus
Which property is shared by most metals?
Shiny and good conductor
What indicates that a chemical change has occurred?
A gas is produced and a new color appears
Which of these is a homogeneous mixture?
Air
What is the overall charge of a neutral atom?
Zero
Where are non-mentals generally located on the periodic table?
Far right side
What is true about a chemical change?
A new substance is formed
What type of matter is salt water?
Homogeneous mixture
What is the charge of an electron?
Negative
Which property describes metals but not nonmetals?
Can be hammered into sheets
Which is an example of a chemical change?
A nail rusting
What do all elements have in common?
They are made of only one kind of atom
Which of the following particles is the smallest in mass?
Electron
Which of the following elements is a good conductor and malleable?
Copper
What kind of change occurs when a candle melts?
Physical change