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Chemistry Basics and Lab Equipment
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1
Question
What does the belief that all matter was made of fire imply about Heraclitus' view?
Answer
All matter is composed of fire.
2
Question
What is the symbol for an electron in subatomic particles?
Answer
e−
3
Question
What is the primary application of iodine-131 in medicine?
Answer
Locate brain tumors, monitor cardiac, thyroid activity.
4
Question
Which isotope is used in cancer radiation therapy?
Answer
Cobalt-60
5
Question
What does the element uranium-235's application involve?
Answer
Nuclear power plant and naval propulsion systems fuel.
6
Question
Which isotope is tagged onto glucose to monitor organs during PET scans?
Answer
Carbon-11
7
Question
What does the belief that all substances were composed of fire, air, water, and earth in proportions suggest about Aristotle's view?
Answer
All substances were composed of fire, air, water, earth.
8
Question
What is the symbol for a neutron in subatomic particles?
Answer
n0
9
Question
What is the main use of calcium-252 in geology?
Answer
Determine moisture content of soil; important for construction.
10
Question
Which isotope is studied to understand blood circulation?
Answer
Sodium-24
11
Question
What is the primary purpose of radioactive isotope technetium-99?
Answer
Locate brain tumors and damaged heart cells.
12
Question
What does the concentration ratio of solute to solution describe?
Answer
The ratio of solute to solution, expressed as percent, parts per million, billion, or trillion.
13
Question
How is the percent by mass of a solution calculated?
Answer
ext{Percent by Mass} = rac{ ext{mass of solute}}{ ext{mass of solution}} imes 100
14
Question
What is the formula for parts per million (ppm)?
Answer
ext{Parts per Million} = rac{ ext{mass of solute}}{ ext{mass of solvent}} imes 1,000,000
15
Question
What is the formula for parts per billion (ppb)?
Answer
ext{Parts per Billion} = rac{ ext{mass of solute}}{ ext{mass of solvent}} imes 1,000,000,000
16
Question
How do you calculate parts per trillon (ppt)?
Answer
ext{Parts per Trillion} = rac{ ext{mass of solute}}{ ext{mass of solvent}} imes 1,000,000,000,000
17
Question
What is the formula for percent by volume of a solution?
Answer
ext{Percent by Volume} = rac{ ext{volume of solute}}{ ext{volume of solution}} imes 100
18
Question
How is molarity defined?
Answer
ext{Molarity} = rac{ ext{moles of solute}}{ ext{liters of solution}}
19
Question
What is the formula for molality?
Answer
ext{Molality} = rac{ ext{moles of solute}}{ ext{kg of solvent}}
20
Question
What are colloids?
Answer
Heterogeneous mixtures with particles larger than ions or molecules but smaller than suspension particles.
21
Question
Name different types of colloids with examples: Sol, Smoke, Gel, Emulsion, Fog, Foam.
Answer
Sol: Paint; Smoke: Smoke; Gel: Butter; Emulsion: Mayonnaise; Fog: Clouds; Foam: Whipped cream.
22
Question
What method is used to separate insoluble solids from mixtures?
Answer
Filtration — using a filter to retain solids and allow liquids to pass.
23
Question
What process involves separating water and salt in a homogeneous mixture?
Answer
Evaporation — water is removed, leaving salt behind.
24
Question
How is a liquid converted into vapor during separation?
Answer
By boiling during distillation, with vapor condensed back to liquid by cooling.
25
Question
What is the primary purpose of a ring stand in chemistry labs?
Answer
To hold and support hardware during experiments.
26
Question
How do safety goggles protect the eyes in laboratory settings?
Answer
They enclose or protect surrounding eye areas from irritants and chemicals.
27
Question
What instrument is commonly used to transfer solids in chemistry labs?
Answer
Scoops primarily used for transferring solids.
28
Question
Why are test tubes used in chemistry experiments?
Answer
To hold, mix, or heat small quantities of liquids or solids.
29
Question
What is the function of a test tube holder clamp?
Answer
To distance a person from dangerous tasks with test tubes.
30
Question
What equipment is used to hold test tubes during experiments?
Answer
Test tube rack.