Chemical and physical Properties
True or False: A chemical property can be observed without changing the substance’s composition.
False
What is a physical property of a substance?
Physical properties can be observed without changing the substance’s composition, like color, density, or melting point.
What is the first element on the periodic table?
Hydrogen
What is the charge of a proton?
Positive
What is a chemical change?
A chemical change occurs when a substance undergoes a reaction that results in the formation of one or more new substances with different properties.
Give an example of a physical change.
Melting ice is a physical change because the substance (H2O) remains the same.
What is the name of the group that contains elements like Helium and Neon, which are known for their stability and lack of reactivity?
Nobel gas
What subatomic particle determines the atomic number of an element?
Protons
Does a piece of paper turning to ash after being burned represent a chemical change or a physical change?
Chemical change
Does boiling water represent a physical change or a chemical change?
Physical changes
What is a non-metal property that makes it distinctive ?
Non-metals are poor conductors of heat and electricity.
What type of elements are typically shiny, good conductors of electricity, and malleable?
Metals
What is the total number of periods (rows) in the periodic table?
7
How many electrons can the second energy shell of an atom hold in a Bohr diagram?
8 electrons
What is the term for elements that have properties of both metals and non-metals, like Silicon?
Metalloids.
Why is dissolving sugar in water a physical change?
The sugar dissolves in the water, but the sugar molecules remain the same, and no new substance is created.
What does the atomic number and atomic mass of an element represent?
The atomic number is the number of protons
The atomic mass is the sum of protons and neutrons
how the periodic table is organized and the significance of element groups and periods.
The periodic table is organized based on the atomic number of elements.
It is divided into 7 periods and 18 groups
The significant groups are metal, non metal and metaloids