Converting Units

Dimensional analysis, SI units, metric prefixes, conversion factors, scientific notation, temperature conversions, density-related measurements, and important vocabulary used in chemistry measurements.

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Views #: 314

Questions #: 33

Pass Score: 80.0%

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What is a conversion factor in chemistry?

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A type of chemical reaction

A ratio equal to one used to change units

A measurement tool

A unit prefix

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What is the SI base unit for length?

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gram

meter

liter

second

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What is the SI base unit for mass?

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gram

kilogram

milligram

pound

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The prefix kilo- means

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100

1,000

0.01

0.001

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The prefix milli- represents

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10⁻¹

10⁻²

10⁻³

10³

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Convert 325 cm to meters

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0.325 m

3.25 m

32.5 m

3250 m

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Convert 2.45 m to millimeters

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24.5 mm

245 mm

2450 mm

24500 mm

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Dimensional analysis is best described as

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Estimating measurements visually

A method of using units to solve problems

Measuring chemical reactions

Balancing equations

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What is the SI base unit for temperature?

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Fahrenheit

Kelvin

Rankine

Celsius only

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Convert 25°C to kelvin

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248 K

273 K

298 K

325 K

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A derived unit is

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A basic SI unit

A unit formed from combinations of base units

A unit used only in chemistry

A temperature unit

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Convert 3.75 L to milliliters

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0.00375 mL

37.5 mL

375 mL

3750 mL

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Scientific notation is useful because it

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Avoids all unit conversions

Makes very large and small numbers easier to work with

Measures temperature

Converts liquids into solids

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Convert 5,500 g to kilograms

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0.55 kg

5.5 kg

55 kg

550 kg

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In dimensional analysis, units that appear in both the numerator and denominator are

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Estimated

Rounded

Canceled

Squared

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Convert 4500 mg to grams

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0.45 g

4.5 g

45 g

450 g

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What does SI stand for in measurement systems?

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Scientific Index

System International

Système International

Standardized Instruments

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Convert 2.5 hours to minutes

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25 min

150 min

250 min

600 min

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Convert 8.5 minutes to seconds

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51 s

85 s

510 s

850 s

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Density is defined as

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Mass divided by volume

Volume divided by mass

Mass multiplied by temperature

Length divided by time

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Explanation

Metric Prefix Match

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To complete the line match

Click on an item in the first group
Click on an item in the second group
To delete a match, double click on a line

prefix

kilo

centi

milli

value

1000

0.01

0.001

Match each metric prefix with its value.

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Classify the following as either SI base units or derived units

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Terms

×meter

×kilogram

×density

×speed

SI Base Units

Derived Units

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Convert Inches to Centimeters

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Using the conversion factor \( 1\text{ in} = 2.54\text{ cm}\ \), convert 10 inches to centimeters.

2.54 cm

25.4 cm

254 cm

2540 cm

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Convert 3.5 feet to inches

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12 in

24 in

36 in

42 in

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Write 0.000072 in scientific notation

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7.2 × 10²

7.2 × 10⁻²

7.2 × 10⁻⁵

72 × 10⁻⁶

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Complete the conversion setup

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\[ 2500\text{ mg} \times \frac{\Box}{1000\text{ mg}} \]

Answer = (1)

Please drag and drop the selected option in the right place or type it instead

1 g

1 kg

100 g

1000 g

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Arrange the steps for solving a dimensional analysis problem

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Please drag and drop the options to sort them

Cancel units

Choose a conversion factor

Multiply the values

Write the original measurement

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Explanation

Estimate the liquid volume shown in the graduated cylinder

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20 mL

25 mL

30 mL

35 mL

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Accuracy refers to

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How close measurements are to each other

How close a measurement is to the true value

The size of the measuring tool

The number of unit conversions

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Precision refers to

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How close measurements are to one another

How close measurements are to the true value

The largest measurement possible

The smallest unit used

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Which of the following conversions are correct?

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1 m = 100 cm

1 kg = 1000 g

1 L = 1000 mL

1 cm = 1000 mm

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Enter the formula used to calculate density

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Which statement best describes dimensional analysis?

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It is a way to estimate values without calculations

It uses units and conversion factors to solve problems

It only works with temperature conversions

It replaces scientific notation

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