Elements
Question: What is the smallest unit of an element that still has the properties of that element?
c) Atom
What is a mixture?
A combination of two or more substances that are physically combined
What is a compound?
A substance formed when two or more elements chemically combine
Which element is essential for us to breathe and is the most abundant gas in the Earth's atmosphere?
b) Oxygen
If you stir sand and water together, what kind of mixture do you create?
A heterogeneous mixture
Which of these is a common compound made of hydrogen and oxygen?
c) Water (H₂O)
Which element is a shiny, malleable metal often used in electrical wires and cooking pots?
c) Copper
Which of the following is an example of a homogeneous mixture?
c) Saltwater
When elements form a compound, do they keep their original properties?
No, they form new substances with different properties
What do we call the chart that organizes all the known elements?
The Periodic Table of Elements
What is a method used to separate a mixture of iron filings and sand?
Using a magnet
What is table salt, also known as sodium chloride, an example of?
A compound
Which element is a very light gas and the most abundant element in the universe?
Hydrogen
In a mixture, do the substances keep their original properties?
c) Yes, they keep their original properties
Can a compound be separated by physical means?
No, it requires chemical reactions