Elements
Which is Not a physical or chemical change? Crushing, Weighing, Melting, Passing electric currents
What is Weighing
The chemical formula for water
What is H2O
A combination of two or more substances that are not chemically combined
What is a mixture
Hg + S --> HgS
Which is the compound?
HgS
An element that is shiny and that conducts heat and electric current well
What is a metal
A pure substance that cannot be separated into simpler substances by physical or chemical means
What is an element
A substance created when a chemical reaction occurs?
Compound
Mixtures are separated by...
by physical means.
ex. spoon, fork, magnet, filters, ...
Na + Cl --> NaCl
Which are the elements?
Na and Cl
Elements that have properties of both metals and nonmetals
What metalloids
A substance that contains only one type of particle
What is an element
The only way to break down a compound is through this
What is a chemical change
A _____ is a mixture that appears to be a single substance but is composed of a solute dissolved in a solvent.
What is a solution
H2 + O --> H2O
Which chemical reactions represent the compound?
H2O
The ability of matter to be hammered into a thin shape Ex: aluminum foil
What is malleable
Elements can be classified into one of these three groups:
What are metals, nonmetals or metalloids
What is NaCl?
Sodium Chloride or Salt
What happens to the physical and chemical properties of each ingredient in a mixture?
Each ingredient keeps their own properties, so the properties stay the same.
C12 + H22 + O11 --> C12H22O11
The chemical equation above represents sugar. Which correctly identifies each side of the equation? Hint: elements/compounds..
elements ---> compounds
These elements tend to be brittle and dull in color
What nonmetals
Most elements occur naturally in nature; however, a few are man-made. Which type takes up the majority of the periodic table?
What is Metal?
What happens to the properties of a compound when a chemical reaction occurs?
A new substance is created and creates new properties.
What constitutes a mixture?
a combination of different items.
H2O2 --> H2 + O2
The chemical equation above represents Hydrogen peroxide. Which correctly identifies each side of the equation? Hint: elements/compounds..
Compounds --> Elements
This nonmetal is very reactive because it has only one electron
What is Hydrogen