What topics do the lesson objectives explore?
Physical and chemical properties, categories of matter, and chemists’ work.
What happens to a substance’s identity during a physical change?
It remains the same.
What happens to a substance’s chemical identity during a chemical change?
It changes.
Into which two categories is matter classified?
Pure substances and mixtures.
What is consistent throughout a pure substance?
Its composition and its chemical and physical properties.
What is a mixture?
A blend of two or more pure substances that retain their identities.
What is an element?
A pure substance containing one kind of atom that cannot be separated into simpler substances by chemical or physical means.
What is a compound?
A pure substance containing two or more different elements chemically bonded together.
What is required to separate a compound into its elements?
A chemical reaction.
How is composition distributed throughout a homogeneous mixture?
It is uniform throughout.
How is composition distributed throughout a heterogeneous mixture?
It is not uniform throughout.
What principle allows physical methods to separate mixtures?
They use differences in the components’ physical properties.
What does electrolysis use to break down water molecules?
Electric current.
Which standards are listed for Newton’s second law and engineering?
HS-PS2-1 and HS-ETS1-1 through HS-ETS1-4.
What engineering activities do HS-ETS1-1 through HS-ETS1-4 cover?
Engineering analysis, design, evaluation, and simulation.
What is the subject explored through physical and chemical properties and categories?
Matter.
Which property terms appear in the lesson vocabulary?
Physical, chemical, extensive, and intensive properties.
Which is a pure substance: distilled water or salt water?
Distilled water.
Which is a mixture: distilled water or salt water?
Salt water.
How is carbon dioxide classified in the Elements and Compounds section?
As a compound.
What kind of mixture is sugar water?
A homogeneous mixture.
What kind of mixture is a bowl of mixed nuts?
A heterogeneous mixture.
Why is milk described as a heterogeneous mixture?
Its components are not uniformly mixed.
What happens to milk fat globules when milk is poured into a glass?
They rise to the top.
What does a filter do during filtration?
It catches large particles while smaller particles pass through.
How does centrifugation separate particles from a mixture?
It spins the mixture at high speed.
What determines how chromatography separates mixture components?
Their different relative attractions to a medium and a solvent.
Answer 15 questions on Matter and Its Classification.
1. A laboratory mixture contains two substances that differ in a physical property, and neither substance needs to be chemically changed. What general approach can separate them?
2. A sample contains atoms of just one kind and cannot be broken into simpler substances by physical or chemical means. How should it be classified?
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