Question

chem 7 pilot study guide test #1

1. classify the following as an element, compound, solution, or suspension?

a. lemonade with pulp:
b. food coloring in water:
c. o₂: element
d. c₈₈h₁₆₄o₁₀ (l):
e. n₂ (g):
f. no (g):
g. dr. pepper:
2.
i. which diagram(s) represent pure compounds?
ii. which diagram(s) represent pure elements?
iii. which diagram(s) show a mixture of compounds and elements?
iv. which diagram(s) could represent a solid metal?
v. which diagram(s) represent a mixture of gaseous elements?

1. what is the name of this separation technique? and what type of mixture does this technique separate?

Explanation:

Step1: Recall definitions

Elements are made of one - type of atom, compounds are made of different types of atoms chemically bonded, solutions are homogeneous mixtures, and suspensions are heterogeneous mixtures with particles that settle.

Step2: Analyze 1.a

Lemonade with pulp is a suspension as the pulp particles will settle over time.

Step3: Analyze 1.b

Food coloring in water is a solution as the coloring dissolves uniformly.

Step4: Analyze 1.c

$O_2$ is an element as it consists of only oxygen atoms.

Step5: Analyze 1.d

$C_{88}H_{164}O_{10}(l)$ is a compound as it is made of carbon, hydrogen, and oxygen atoms chemically bonded.

Step6: Analyze 1.e

$N_2(g)$ is an element as it consists of only nitrogen atoms.

Step7: Analyze 1.f

$NO(g)$ is a compound as it is made of nitrogen and oxygen atoms chemically bonded.

Step8: Analyze 1.g

Dr. Pepper is a solution as it is a homogeneous mixture of various substances like flavorings, sugars, and carbon - dioxide in water.

Step9: Analyze 2.i

Diagram B represents a pure compound as it shows only one type of molecule made of different atoms.

Step10: Analyze 2.ii

Diagrams A, D, and H represent pure elements. A shows diatomic molecules of one element, D shows single atoms of one element, and H shows a lattice of one - type of atom (could be a solid metal or a solid non - metal in a simple cubic structure).

Step11: Analyze 2.iii

Diagram F shows a mixture of compounds and elements as it has both molecules of a compound and single atoms of an element.

Step12: Analyze 2.iv

Diagram H could represent a solid metal as it shows a regular arrangement of atoms in a lattice.

Step13: Analyze 2.v

Diagram A represents a mixture of gaseous elements as it shows diatomic molecules of two different elements.

Step14: Analyze 3

The separation technique is distillation. It is used to separate homogeneous mixtures, especially liquid - liquid mixtures with different boiling points.

Answer:

1.a. Suspension
1.b. Solution
1.c. Element
1.d. Compound
1.e. Element
1.f. Compound
1.g. Solution
2.i. B
2.ii. A, D, H
2.iii. F
2.iv. H
2.v. A

1. Name: Distillation; Type of mixture: Homogeneous (liquid - liquid mixtures with different boiling points)