Compounds Flashcards
How do atoms form compounds?
Atoms form compounds by combining with other atoms through chemical bonds.
What are compounds made from?
Compounds are made from two or more elements in fixed proportions.
What happens to electrons when atoms form compounds?
Electrons are shared, given away, or taken to form bonds in compounds.
Why is it hard to separate elements in a compound?
Separating elements in a compound requires a chemical reaction.
What is an ionic bond?
An ionic bond forms when a metal loses electrons to form positive ions and a non-metal gains electrons to form negative ions.
What is covalent bonding?
Covalent bonding occurs when non-metals share electrons to form molecules.
How do the properties of a compound compare to its elements?
The properties of a compound are usually different from the properties of its original elements.
Give an example of a compound with different properties than its elements.
Iron and sulfur combine to form iron sulfide, which is a dull, grey solid unlike iron or sulfur.
How are compounds represented?
Compounds are represented by formulas showing the fixed proportions of elements.
What does CO₂ represent?
CO₂ (carbon dioxide) represents a compound with 1 carbon atom and 2 oxygen atoms.
What does H₂SO₄ represent?
H₂SO₄ (sulfuric acid) contains 2 hydrogen atoms, 1 sulfur atom, and 4 oxygen atoms.
What does a formula with brackets indicate?
A formula with brackets, like Ca(OH)₂, indicates that everything inside the bracket is multiplied by the number outside it.
How would you interpret Ca(OH)₂?
Ca(OH)₂ means there are 1 calcium atom, 2 oxygen atoms, and 2 hydrogen atoms.
What is the formula for carbon dioxide?
The formula for carbon dioxide is CO₂.
What is the formula for ammonia?
The formula for ammonia is NH₃.
