STATES OF MATTER
Particles in this state vibrate in fixed positions.
Solid
Ice melting is an example of this type of change.
Physical change
A substance made of only one type of atom.
Element
This symbol represents oxygen.
O
Why is melting ice not considered a chemical reaction?
No new substance is formed
This state has particles close together but able to move past one another.
Liquid
Rust forming on iron is this type of change.
Chemical change
Water (H2O) is an example of this.
Compound
Most elements on the periodic table are these: metals or non-metals?
Metals
This type of chemical reaction decreases the temperature of the surrounding area
Endothermic
In this state, particles move freely and fill the container.
Gas
This change results in a new substance being formed.
Chemical change
Air is best described as this type of matter.
Mixture
Name one property of metals.
Conduct electricity; malleable; shiny; strong
This type of chemical reaction requires oxygen
Oxidative/Combustion
What happens to particles when a solid melts?
They gain energy and move more freely
Dissolving sugar in water is classified as what type of change?
Physical change
What is the key difference between a compound and a mixture?
Compounds are chemically bonded; mixtures are not
The name for rows in the periodic table
Periods
Bread is toasted. Is this more like a physical or chemical change, and why?
Chemical change because new substances form and the change is difficult to reverse
Which change of state occurs when a gas turns into a liquid?
Condensation
Name one piece of evidence that a chemical reaction has occurred.
Gas produced; colour change; temperature change; new substance
The name of the current atomic model
Chadwick-Bohr Model
This type of element has characteristics of metals and non-metals
Metalloid
Two substances look identical before mixing, but the temperature suddenly increases when they combine. What type of change is occurring?
Chemical change because energy is released (Exothermic) and a new substance forms