LAB 3: Measurements And The Physical Properties

Question 1

What does SI means

Answer 1

System international d’Unites

Question 2

This is sometimes called the ‘mks’ system and the primary units

Answer 2

Meter, Kilograms, Seconds

Question 3

The “cgs” System

Answer 3

Centimeters, grams, seconds

Question 4

All of the unit relationships in the metric system are based on multiples of

Answer 4

10

Question 5

Kelvin Formula

Answer 5

K = C + 273.15

Question 6

degree Celsius Formula

Answer 6

C = F - 32 / 1.8

Question 7

Degree Fahrenheit

Answer 7

F = 1.8 (C) + 32

Question 8

1 inch = ____ centimeters

Answer 8

2.54

Question 9

1 mile =___ kilometers

Answer 9

1.609

Question 10

1.093 yard = meters

Answer 10

1

Question 11

1 foot = __ inch

Answer 11

12

Question 12

2.205 pounds = ____ kilograms

Answer 12

1

Question 13

1 ton =___ kg

Answer 13

907.2

Question 14

1 slug = ___ kg

Answer 14

14.594

Question 15

refers to the fact that water sticks to itself very easily.

Answer 15

Cohesion

Question 16

means that water also sticks very well to other things, which is why it spreads out in a thin film on certain surfaces, like glass

Answer 16

Adhesion

Question 17

When water comes into contact with these surfaces, the adhesive forces are ____ than the cohesive forces. Instead of sticking together in a ball, it spreads out.

Answer 17

stronger

Question 18

Water also has a high level of

Answer 18

surface tension

Question 19

The property of the surface of a liquid that allows it to resist an external force, due to the cohesive nature of its molecules.

Answer 19

Surface Tension

Question 20

means that the molecules on the surface of the water are not surrounded by similar molecules on all sides, so they’re being pulled only by cohesion from other molecules deep inside

Answer 20

Surface tension

Question 21

is also a result of surface tension. As we mentioned, this happens in plants when they “suck up” water.

Answer 21

Capillary Action

Question 22

when liquid flows through narrow spaces without external forces, such as gravity

Answer 22

Capillary Action

Question 23

Water’s ___ are also why its solid form, ice, can float on its liquid form.

Answer 23

hydrogen bonds

Question 24

Ice is less ___ than water because water molecules form crystalline structures at freezing (32 degrees Fahrenheit or 0 degrees Celsius) temperatures

Answer 24

dense

Question 25

TRUE or FALSE

The thermal properties of water are also linked to its hydrogen bonds. Water has a very high specific heat capacity

Answer 25

True

Question 26

which is the amount of heat per unit mass required to raise its temperature by one degree Celsius.

Answer 26

Heat Capacity

Question 27

The energy required to raise the temperature of water by one degree Celsius is ___ joules per gram.

Answer 27

4.2

Question 28

Water also has a high heat of ____, which means that it can take a lot of heat without its temperature rising much. This plays a huge part in the climate, because it means that oceans take a long time to warm up.

Answer 28

vaporization

Question 29

Is often used in an ice-water mixture to lower the freezing point of water, allowing the mixture to become colder than the normal freezing point

Answer 29

Rock Salt

Question 30

Works similarly to rock salt in lowering the freezing point but doesn’t significantly impact the process, although it may slightly affect solubility

Answer 30

Iodized Salt

Question 31

Is less effective than salt, as it creates a solution that interferes with ice formation but is not commonly used

Answer 31

Brown sugar

Question 32

(Sodium bicarbonate) can alter the mixture’s pH, making it more alkaline, but it is not as effective as salt in lowering the freezing point

Answer 32

Baking Soda

Question 33

Does not contribute to freezing point depression and is not recommended due to its toxicity

Answer 33

Zonrox

Question 34

Commonly used in redox reactions due its chemical reactivity, may lower the freezing point like salt, though it is not widely used for this purpose

Answer 34

Potassium Iodide

Question 35

Can you use them in measuring large-scale distances such as the distances of stars and galaxies

Answer 35

No, since they are unsuitable. These distances are so wide that smaller units would produce extremely massive, difficult-to-manage, and uncountable figures.

Question 36

Astronomers use larger measures such as _____ to measure distances.

Answer 36

light-years, astronomical units (AU), or parsecs

Question 37

S.1. Base units and prefixes are important because they give a consistent means of measuring things, making it easier for scientists to convey and compare their findings.

These units aid in the accurate measurement of ____ such as proteins and enzymes, which are frequently researched in biochemistry. Scientists can readily quantify small quantities using prefixes such as milli-, micro-, and nano-:

Answer 37

small amounts of molecules

Question 38

You can resolve uncertainties in measurements by having different ___ in your experiments.

Answer 38

trials

Question 39

____ are important in experiments because they improve the reliability, accuracy, and validity of the results.

Answer 39

Trials