Metals, nonmetals and metalloids
This type of element is shiny, malleable, and conducts electricity well.
Metal
A metal that can be hammered into thin sheets has which physical property?
Malleability
What evidence shows a new substance formed when vinegar reacts with baking soda?
Gas bubbles (CO₂) form, showing a chemical reaction
Ice melting is what type of change?
Physical change
The periodic table is arranged by increasing ____.
Atomic number
This type of element is dull, brittle, and a poor conductor.
Nonmetal
A metal that can be pulled into wire shows what property?
Ductility
During a reaction, the container becomes cold. What does this reveal about the energy change?
The reaction absorbed heat—endothermic chemical change.
Burning wood is what type of change?
Chemical change
Elements in the same group have similar ____.
Properties / chemical behavior
Elements that have properties of both metals and nonmetals are called ____.
Metalloids
The ability of a substance to allow heat or electricity to pass through it is called ____.
Conductivity
A change in temperature without heating or cooling from outside indicates a change in ____.
Thermal energy
Tearing paper is a ____, because the substance is still paper.
Physical change
Where are metals located on the periodic table?
On the left side
Silicon, found in computer chips, is an example of this type of element.
Metalloid
You’re given an unknown element that’s shiny but brittle. Which class might it belong to, and what test could confirm your hypothesis?
Metalloid; test conductivity to see if it conducts partially.
Iron rusts slowly in humid air. What evidence suggests this is a chemical change, and what new substance forms?
Color change (reddish-brown), new substance—iron oxide (rust).
Rust forming on a car is evidence of a ____.
Chemical change
Where are nonmetals located on the periodic table?
On the right side
These elements are often found in the bottom two rows of the periodic table and include lanthanides and actinides
Rare Earth Elements
What do scientists call characteristics that can be observed or measured without changing a substance’s identity?
Physical properties
What is the best evidence that a new substance has formed?
New chemical properties / new substance created
Explain one way to tell a chemical change from a physical change
A chemical change forms a new substance; a physical change does not.
What element separates metals from nonmetals in a “stair-step” pattern?
Metalloids