Matter? What's the matter with matter?

What is the definition of chemistry?

• The study of matter and its interactions

• The study of celestial bodies

• The study of living organisms

• The study of past human activities

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Matter is:

• a form of energy

• anything that has mass and takes up space

• a type of force

• a chemical reaction

List 3 properties of solids. Do the same for liquids and gases.

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Which of the following best describes how tightly packed the particles are in solids, liquids, and gases?

• Solids are tightly packed, liquids are less tightly packed, and gases are loosely packed.

• Solids are loosely packed, liquids are tightly packed, and gases are less tightly packed.

• Solids are less tightly packed, liquids are loosely packed, and gases are tightly packed.

• Solids, liquids, and gases are all tightly packed.

Explain the difference between pure substances and mixtures.

• Pure substances have a fixed composition, while mixtures have variable compositions.

• Pure substances can be separated by physical means, while mixtures cannot.

• Mixtures have a fixed composition, while pure substances have variable compositions.

• Both pure substances and mixtures have variable compositions.

Explain the difference between elements and compounds.

• Elements are pure substances consisting of only one type of atom, while compounds are substances formed from two or more different types of atoms bonded together.

• Elements are substances that can be broken down into simpler substances, while compounds cannot be broken down.

• Elements and compounds are both pure substances, but elements are made of molecules and compounds are made of atoms.

• Elements are always gases, while compounds are always solids.

Explain the difference between heterogeneous and homogeneous mixtures.

• Heterogeneous mixtures have a uniform composition, while homogeneous mixtures do not.

• Heterogeneous mixtures have a non-uniform composition, while homogeneous mixtures have a uniform composition.

• Both mixtures have a uniform composition.

• Both mixtures have a non-uniform composition.

List 5 elements.

• Hydrogen, Helium, Lithium, Beryllium, Boron

• Mercury, Venus, Earth, Mars, Jupiter

• Red, Blue, Green, Yellow, Purple

• Dog, Cat, Mouse, Elephant, Tiger

Which of the following is a compound?

• Water (H2O)

• Oxygen (O2)

• Gold (Au)

• Iron (Fe)

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Which of the following is a heterogeneous mixture?

• Saltwater

• Air

• Salad

• Vinegar

• Brass