Matter & Measurement

Question 1

What is ‘Accuracy’?

Answer 1

Accurate data is close to the true value of what you are trying to measure.
Ex: If the measurement you took is correct and is on target with expectations.

Question 2

What is ‘precision’?

Answer 2

Precise data gives similar results if you repeat the measurement.
Ex: The measurements you take are nearly the same each time you repeat the measurement.

Question 3

What does ‘measurement’ mean?

Answer 3

Measurement is the assignment of numbers to an item that allows it to be compared with other items. For example, your height allows you to compare yourself with others. AND compare your growth over the years. Measurement can be of MANY things in MANY ways, for example, we can measure length, width, amount, time, and temperature.

Question 4

What are ‘units’?

Answer 4

Units are the numbers we assign to measurements. These can include inches, cups, degrees, minutes, seconds, centimeters, and kilometers.

Question 5

What is the ‘Metric System’?

Answer 5

Scientists use the Metric System for all measurements. This means we DO NOT measure in inches, feet, and yards but we measure in meters, liters, and grams. These are the base units for the metric system.

Question 6

Two important rules to follow when writing measurements in Science Class:

Answer 6

-Always write the measurement number and the unit- NO NAKED NUMBERS!
-Always write in decimals (NEVER IN FRACTIONS)

Question 7

True or False:
It is ok to leave the unit off a measurement.

Answer 7

False

Question 8

True or False:
In Science, we ONLY use the metric system.

Answer 8

True

Question 9

True or False:
You can only use EITHER side of a ruler to measure in Science class.

Answer 9

False

Question 10

True or False:
If you leave a unit off a number it is called a “Naked Number.”

Answer 10

True

Question 11

True or False:
Always record your measurements in fractions, NOT in decimals.

Answer 11

False

Question 12

How do you measure with a ruler?

Answer 12

When measuring with a ruler, you always use the METRIC side of the ruler. When labeling your answer, you will use: Kilometers, Meters, Centimeters, and Millimeters. Never use a fraction in your measurement. Label all ruler measurements in DECIMALS.

Question 13

What are the rules for measuring with a ruler?

Answer 13

-Always start at the beginning of the ruler.
-No naked numbers. (Always write a label.)
-If you need to measure in centimeters, use the side of the ruler that says centimeters.
-If you need to measure in inches, then use the side of the ruler that says inches.

Question 14

How do you read a thermometer?

Answer 14

When reading a thermometer, give the thermometer, give the thermometer time to measure the temperature. When labeling your answer, you will use Celsius!!! Unit: Never use a fraction in your measurement. Label all ruler measurements in DECIMALS.

Question 15

What are the rules for measuring with a thermometer?

Answer 15

-Give the thermometer time to read the temperature
-Always use decimals
-Always use celcius

Question 16

What are the steps for measuring mass?

Answer 16

In our science class, we will measure mass with an electric scale. Mass can be measured using a Triple Beam Balance. When labeling your answer, you will use: Kilograms, Grams, and Milligrams.

Question 17

What is the difference between mass and weight?

Answer 17

The difference between mass and weight is that mass always stays the same and weight is something that can change.

Question 18

Arrange these mass measurements in order from least to greatest.
90 mg, 90.0 kg, 900 g, 90 g

Answer 18

90 mg, 90 g, 900 g, 90.0 kg

Question 19

There is a block of cheese that has a mass of 264. 4 g What would the mass of this item be on the moon?

Answer 19

264.4 grams. The mass on the moon is always the same as here on earth.

Question 20

What is volume?

Answer 20

Volume is the amount of space inside a solid. Measuring volume tells us how much SPACE an item takes up.

Question 21

How do you measure volume?

Answer 21

In our science class, we will measure the volume of rectangles by measuring EACH side… the length, the width, and the height and then multiplying them. When labeling your answer, you will use: Kilometers, Meters, Centimeters, and Millimeters.

Question 22

What is volume?

Answer 22

Volume is Lengthxwidthxheight. Volume is the amount of space inside a solid.

Question 23

Provide 3 examples of rectangular prisms in everyday life:

Answer 23

Three examples of a rectangular prism I have in my everyday life are books, my bed, and a desk.

Question 24

How do you measure liquid volume?

Answer 24

Measuring liquids in graduated cylinders can be tricky because the liquid surface is curved. This curved surface is called the MENISCUS. A meniscus forms because the liquid molecules are more strongly attracted to the container than to each other. To properly measure the volume of a liquid in a graduated cylinder you must be at eye level and read the bottom point of the meniscus. When labeling your answer, you will use: Kiloliters, Liters, and Milliliters.

Question 25

What are three rules for measuring with a graduated cylinder?

Answer 25

-Always have a label
-Know how to count the lines
-Eye-level

Question 26

True or False:
Items with the same mass sink to the same spot in the water.

Answer 26

False

Question 27

True or False:
Items with larger volumes will sink more than items with smaller volumes.

Answer 27

False

Question 28

True or False:
Items with the same density will sink (or float) in the same spot in water

Answer 28

True

Question 29

True or False:
An item with a larger volume does not always have a larger mass.

Answer 29

True

Question 30

True or False:
If I increase the mass AND the volume of an item, the density will increase

Answer 30

False

Question 31

What is density?

Answer 31

Density is a measure of the mass of a material in a given volume. If an item is dense, the matter is more tightly packed. If it is less dense, the matter is more loosely packed. Density can be expressed as the number of grams in one cubic centimeter (g/cm 3) If an item is a solid or g/ml if the item is a liquid. You can determine the density of a sample of matter by dividing its mass by its volume.