Chemistry A - Unit 1 - Classifying Matter
Which of the following are considered pure substances?
1. element 2. compound
What types of mixtures are these?
Homogeneous: food coloring, a cup of tea Heterogeneous: peanuts, a bucket
Chemists investigated an unknown substance and found it to have the following characteristics: Different components could be observed in the substance. Different samples of the substance appeared to have different proportions of the components. The components could be easily separated using filters and sorting. Which statement most accurately describes this substance?
The substance is a heterogeneous mixture.
Which of the following describes a compound? (Hint: Carbon and oxygen both appear on the periodic table.)
a substance made of two oxygen atoms for each carbon atom
When Phillip analyzed an unknown substance X, he found that it contained only one kind of atom. Phillip was unable to convert the substance to a simpler one. What is substance X?
an element
For clouds to form, water vapor in the air must condense and change from a gas to a liquid. What must water molecules do as part of this process?
come close together and stick to each other
Which state of matter is highly compressible, is made of particles moving independently of each other, and is present in large quantities near Earth's surface?
gas
Complete the following statements to describe solids, liquids, and gases. Select the correct answer from each drop-down menu. A solid ( ) a definite volume and ( ) a definite shape. A liquid ( ) a definite volume and ( ) a definite shape. A gas ( ) a definite volume and ( ) a definite shape.
has/has has/does not have does not have/does not have
A chef makes salad dressing by mixing oil, vinegar, and spices, as shown. Which type of matter is the salad dressing?
heterogeneous mixture
Match each state of matter with the statement that best describes it.
solid - It retains its shape... liquid - Particles move past each other freely... gas - It expands to fill the volume... plasma - Particles are so hot...
