Properties of Matter Assessment

• It has a subscript.

• It uses chemical symbols.

• It only has one type of atom.

Which of the following is an example of a homogeneous mixture?

• Sand and water

• Iron filings and sulfur powder

• Salt dissolved in water

Which statement best supports the argument that fruit salad is a model for a heterogeneous mixture?

• The fruit salad has a uniform composition throughout.

• The different fruits can be easily seen and separated.

• The fruit salad contains only one type of fruit.

Circle the model that represents an element, then describe the difference between a model of an element and a model of a compound.

A model of compound will have _________________________ but a model of an element will have ____________________________.

Your teacher makes a model using beads. The beads are in a beaker. There are two types of beads and none of the beads are connected to each other. What types of matter could the model possibly represent?

_____________________________

A group of students is analyzing different substances found in their classroom to determine whether they are elements, compounds, homogeneous mixtures, or heterogeneous mixtures. After their analysis, they come up with the following statements:

a) The water in a glass is uniform throughout and made of H₂O molecules.

b) The salt in a saltshaker consists of identical NaCl crystals.

c) The salad in the lunchbox contains lettuce, tomatoes, and cucumbers that can be easily separated.

d) The air in the classroom is made up of nitrogen, oxygen, carbon dioxide, and other gases mixed together evenly.

e) The aluminum foil used to wrap sandwiches is made of pure aluminum. Which of the following statements correctly classify the substances? Select THREE correct answers.

• The salt in a saltshaker is a compound.

• The salad in the lunchbox is a heterogeneous mixture.

• The air in the classroom is a heterogeneous mixture.

• The aluminum foil is an element.

Circle the correct answer and finish the sentence: A chemical formula shows that water is a/an ( element / compound ) because it is made of more than one type of atom.

• element

• compound

Which statement best supports the correct scientific argument using models?

• A model of a water molecule is always made up of two hydrogen atoms and one oxygen atom, and this specific combination shows that water is a compound.

• A model of water shows it contains only one type of atom, indicating it is a pure element.

• A model showing dissolved substances in water would indicate that water is a solution.

Which student's reasoning is correct?

• Ali

• Casey

• Alex

Which statement best supports the correct scientific argument using models?

• A model of a water molecule is always made up of two hydrogen atoms and one oxygen atom, and this specific combination shows that water is a compound.

• A model of water shows it contains only one type of atom, indicating it is a pure element.

• A model showing dissolved substances in water would indicate that water is a solution.