Homogeneous and Heterogeneous Mixtures Exam Answers


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Chemistry Part 1 Mid-term Exam

Use the figure below to answer the question.

1. Infer a quantitative measurement that can be made from the scene shown. Be sure to use at least ONE
A quantitative measurement uses numbers, and a qualitative measurement uses observations or the
characteristics of an object or group. From the scene shown, a quantitative measurement of the pencil can be
taken using the ruler in inches next to the pencil.
2. Explain the difference between mass and weight. Be sure to use at least TWO COMPLETE CONTENT RELATED
SENTENCES. (ref: 9).
Mass is the amount of matter in an object that takes up a certain amount of space. Weight is how heavy an
object is, measured by the force of gravity on an object. An object’s mass on different-sized planets would be
the same, but the weight would change.
3. Scientific methods may include three steps of study as listed below. Explain each step in detail with complete content
related sentences. (ref: 12-16)
a. Hypothesis:
The hypothesis-forming step in the scientific method involves forming an informed inference about the potential
outcome of the experiment. After the experiment is completed, the hypothesis can be proven true, false, or
b. Theory:
A theory is formed by informed scientific reasoning and as much testing that is possible. Theories are generally
widely accepted beliefs based on facts, but they can always be tested or disproved.
c. Scientific law:
A Scientific Law is an explanation of a consistently observed result of a process in the natural world. Laws can
be tested through reproduced experiments using the scientific method, and they are proven true through the
experimental results each time.

3. The figure shows a student mixing two chemicals. Is she following safe laboratory practices? Support your
answer with details and discuss at least 4 rules that are not being followed. (ref: 19 – Table 2)
The student is not following safe laboratory practices mixing the two chemicals. She is not wearing any of the
required personal protective equipment including safety goggles, gloves, heat protection, and a lab coat. Her
hair should be tied back so that it doesn’t get contaminated by the chemicals, or potentially catch on fire by the
chemicals she is working with. The student is also pouring the water into the acid which is dangerous because
the reaction between acid and water is not limited in how much acid will react with the water; the acid should
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Chemistry Part 1 Mid-term Exam
be poured into the water. The student should not be holding the container that she is pouring the liquids into.
The container should be on the table to be safe and to avoid breaking the glass or tripping and spilling the

5. Show how to convert the temperature 84.7° C to Kelvin. Please include all steps and circle the final answer. (ref: 34-35)
K = °C + 273
K = 84.7°C + 273
K = 357.7
K = °C + 273.15 (depending on how accurate the degrees are that you use in the conversion)
K = 84.7°C + 273.15
K = 357.85

6. Evaluate this dimensional analysis setup. A paperclip is 3.2 cm long. How many paperclips would fit in the length of a
football field (100 yards) if 1 inch = 2.54 cm? Be sure to show ALL steps in the conversion. (ref: 40-46)
1 paperclip = 3.2 cm
1 inch = 2.54 cm
36 inches = 1 yard

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Chemistry Part 1 Mid-term Exam

1 paperclip 2.54 cm 36 in
100 yards
= 2587.5
football field
3.2 cm
1 in
1 yard 1 football field

2.54 ∙ 36 ∙ 100
= 2857.5
2587.5 paperclips would fit in the length of 1 football field.
7. What is the relationship between accuracy and precision? Please use at least TWO complete content related sentences.
(ref: 47-48).
Accuracy means that the measurement or outcome of an experiment is close to the actual value of the
measurement. Precision is when all the measurements are close to each other, even though the actual value is
different from the measured values. When a measurement is accurate and precise, the values are close in
range and close to the actual value of the experiment.

8. A vessel contains 30 mL of water. A sample of 5.0 g of copper metal is dropped into this vessel, raising the level of
water in it to 40 mL. What is the density of the copper sample? P...

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