Atoms
What is the smallest unit of an element that will still have the properties of that element?
What is an atom?
What do you call two or more atoms chemically bonded together?
A characteristic that can be observed or measured.
What is a physical property?
Is color a physical property or chemical property?
Physical Property
Which is evidence of a chemical reaction: melting ice, cutting paper, or producing gas?
What is producing gas?
What subatomic particle has NO charge?
What is a neutron?
How many different elements are represented in CO₂?
What is two?
A student observes that a metal is shiny, solid, and conducts electricity. Are these physical or chemical properties?
What are Physical Properties?
A substance can react with oxygen and burn. Is this a physical property or a chemical property? What is the name of it?
Chemical Property - Flammability
What happens during a chemical reaction?
Atoms are rearranged to create something new
Name the three main subatomic particles in an atom.
What are protons, neutrons, and electrons?
How many Oxygen atoms are in CO3H4O2
What is 5?
A scientist has two unknown white powders. Both look the same. What could the scientist do to determine if they are the same substance?
Test and compare their properties, such as solubility, density, melting point, or reactivity.
What is a GREAT example of a chemical change?
show me your whiteboards
2O + H --> H2O
How do you know this example is a chemical reaction?
H2O (a new substance) is formed. Water has different properties than oxygen and hydrogen. O and H are gasses, Water is a liquid.
Where are all the subatomic particles of an atom located?
Nucleus - protons and neutrons
Orbital Rings - electrons
Draw a 2D model of C4O2.
show me your white board
A student says, “If two substances have the same color, they must be the same substance.” Is the student correct? Explain.
No. Different substances can have the same color. Scientists need to compare multiple properties to identify a substance.
Two clear liquids are mixed together. Suddenly, the mixture becomes cloudy and a solid appears.
What is this an example of?
What is a chemical reaction/change?
A student puts an ice cube in a cup. The ice melts and becomes liquid water. Another student says this is a chemical reaction because the water looks different from the ice.
Do you agree or disagree? Use evidence to support your answer.
This is a physical change because the substance is still water. No new substance formed.
What element ahs 6 protons, 6 neutrons and 6 electrons?
What is Carbon?
What are the two types of extended structures? What would a crystal be considered?
What is Chain and Crystalline Structure?
Two substances look exactly alike. Explain why scientists should not rely only on appearance to identify them.
What is different substances can have similar appearances but different physical and chemical properties.
What is the main difference between a PHYSICAL change and a CHEMICAL CHANGE.
Chemical changes cannot be reversed! It is PERMANENT!
A student places a piece of magnesium into a clear liquid. Within a few seconds, the liquid begins to bubble. The container feels warmer, and after the reaction, the magnesium is no longer visible.
What evidence suggests that a chemical reaction occurred?