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Questions and Answers
How many kilograms are there in 8.34 × 10^{10} mg?
How many kilograms are there in 8.34 × 10^{10} mg?
- 8.34 × 10^{7} kg (correct)
- 8.34 × 10^{-5} kg
- 8.34 × 10^{2} kg
- 8.34 × 10^{-2} kg
If 1 foot equals 12 inches and you need to convert 5 feet to inches, what is the correct total in inches?
If 1 foot equals 12 inches and you need to convert 5 feet to inches, what is the correct total in inches?
- 50 inches
- 55 inches
- 45 inches
- 60 inches (correct)
In the metric system, how many decimeters are in 2.5 meters?
In the metric system, how many decimeters are in 2.5 meters?
- 2.5 dm
- 2.0 dm
- 250 dm
- 25 dm (correct)
Which metric prefix represents one millionth (10^{-6})?
Which metric prefix represents one millionth (10^{-6})?
When comparing the metric system to the Imperial system, which is a significant advantage of the metric system?
When comparing the metric system to the Imperial system, which is a significant advantage of the metric system?
What is the conversion of 7.52 × 10−5 ng to pg?
What is the conversion of 7.52 × 10−5 ng to pg?
If a tree measures 398 inches in height, how many meters is that approximately?
If a tree measures 398 inches in height, how many meters is that approximately?
How long is a 155-inch iron rod after 20% is melted?
How long is a 155-inch iron rod after 20% is melted?
What is the equivalent of 18.5 mg in ng?
What is the equivalent of 18.5 mg in ng?
Which conversion factor should be used to convert feet to centimeters?
Which conversion factor should be used to convert feet to centimeters?
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Study Notes
Composition and Classification of Matter
- Examples of mixtures include sand with water, oil with water, salad dressing, pizza, and concrete, showcasing the diverse nature of matter.
Measurements in Chemistry
- English System: Common in the US; includes units such as feet, inches, yards, and miles (1 foot = 12 inches; 1 mile = 5280 feet).
- Metric System: Uses decimals and powers of ten for easy calculations (1 meter = 10 decimeters; 1 meter = 100 centimeters; 1 meter = 1000 millimeters).
Metric Prefix Scale
- Metric prefixes represent powers of ten and serve as shorthand (e.g., milli-, centi-, kilo-).
- Decimal point shifts: Right for division, left for multiplication.
Practice Examples
- Conversion between metric units is essential:
- For example, 10^3 mm = 1 m, and 100 mm = 0.1 km.
- Example calculations demonstrate the conversion between milligrams and kilograms (e.g., 8.34 × 10^10 mg).
English and Metric Unit Conversion
- Common practice includes converting lengths and weights between systems:
- A sheet of paper measuring 11 inches converts to 279.4 mm (11 x 2.54).
- Height of a tree at 398 inches converts to 10.11 meters.
- Length of an iron rod of 155 inches reduces to 315 cm after 20% is melted.
Additional Measurement Examples
- Weight conversion examples illustrate practical applications:
- 635 lb equals approximately 288.3 kg.
- Weight conversions also include mg to kg conversions (e.g., 243 lb = ____ mg).
Importance of Accurate Measurements
- Understanding both English and Metric systems is vital for scientific accuracy.
- Proficiency in unit conversions is essential for chemistry applications and real-world scenarios.
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