# 10 Chem 2

### 43 terms by estjroden

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### What is the difference between a base unit and a derived unit?

Base units are defined units based on specific objects or events in the physical world. Derived units are defined by combining base units.

-34C

-273C

### You live 6 kilometers from your school. How many meters do you live from school?

6 km x 1000 m/km = 6000 m

### How many seconds are there in a millisecond?

1 sec/1000 milliseconds = 0.001 seconds

1 milliliter

### Explain in terms of density why a grocery bag containing all canned goods is harder to lift than a grocery bag containing all paper goods

Canned goods are more dense than paper goods. They have more mass per unit volume. Thus, for the same volume, the canned goods have more mass than the paper goods. The greater mass is more difficult to lift.

100 cm.

100C

### How can you obtain an object's volume if you know its density and its mass?

Answers may vary. Students should note that density is defined as the mass of an object divided by its volume. Thus, algebraically, you can determine that an object's volume is equal to its mass divided by its density.

False

True

100 cm

weight

second

one millimeter

373 K

2 m3

### How many significant digits are there in 6.023 x 1023 molecules?

There are four significant digits in 6.023 x 1023 molecules.

4

2.0 X 10 -12

4

### You calculate that your semester average in history is 97.5. When you get your report card, your average is 96. What was the percent error of your calculation?

1.6%; Solution: percent error = error/accepted value x 100%, percent error = (97.5 - 96)/96 x 100% = 1.5625% = 1.6%

### If two measurements are very close to each other, then they are ____.

precise

It has three significant figures.

### Poor precision in scientific measurement may arise from

both human error and the limitations of the measuring instrument.

precise

4392 cm3

independent

### The three most common data patterns seen are:

Proportionality, linearity and inverse proportionality

### base unit

A defined unit in a system of measurement that is based on an object or event in the physical world and is independent of other units.

### second

The SI base unit for time.

### meter

The SI base unit for length.

### kilogram

The SI unit for mass; about 2.2 pounds.

### derived unit

A unit defined by a combination of base units.

### liter

The metric unit for volume equal to one cubic decimeter.

### density

The ratio of the mass of a substance to the volume of the substance.

### kelvin

The SI base unit of temperature.

### accuracy

Refers to how close a measured value is to an accepted value.

### precision

Refers to how close a series of measurements are to one another; precise measurements show little variation over a series of trails, but may not be accurate.

### percent error

The ratio of an error to an accepted value.

### significant figure

The number of all known digits reported in measurements, plus one estimated digit.

### graph

A visual representation of information, such as a circle graph, line graph, or bar graph, that can reveal patterns in data.

Example: