Inorg lab

Question 1

In science, a measurement is the assignment
of a numerical value to an objects’ physical
property

Answer 1

Measures of SI system

Question 2

standardized amounts of
various physical quantities

Answer 2

Unit of measure

Question 3

is the
international system of measure used by
scientists
______

Answer 3

SI system (System International)

Question 4

refers to how close something is to
the target or actual using a target value

Answer 4

Accuracy

Question 5

refers to how consistent our results
are regardless of how close to the true value
they are using our target

Answer 5

Precision

Question 6

Properties of matter that
can be observed or measured without trying to
change the composition of the matter being
studied. (observed and measured without
changing chemical identity: color, length, volume
and opacity)

Answer 6

Physical Properties

Question 7

properties that matter
demonstrates when attempts are made to
change it into new substances.(observed and
measured as sample changes chemical identity:
acidity, reactivity, flammability, toxicity).

Answer 7

Chemical Properties

Question 8

The earliest units used for
measurements were based on the
dimensions of the human body.
(ex: 1 foot = length of an important
person’s foot)

Answer 8

Standardized Units of Measurement

Question 9

In _____ an international agreement
established SI units (after the French
Systeme International d’Unites) in an
attempt to further standardize scientific
measurements.

Answer 9

1960

Question 10

in a measurement
include all the digits that are known, plus a last
digit that is estimated.

Answer 10

Significant Figures

Question 11

A ratio of two different units, used
as a multiplier to change from one system or unit to
another.

Answer 11

Conversion Factor

Question 12

Defined by setting the normal
freezing point of water ate 32°F and the normal
boiling point of water at 212°F.

Answer 12

Fahrenheit (F)

Question 13

Defined by setting the normal freezing
point of water at 0°C adn the normal boiling point of
water at 100°C.

Answer 13

Celsius (C)

Question 14

Zero is the lowest possible temperature

Answer 14

Kelvin (K)

Question 15

Kelvin is also called as?

Answer 15

Absolute scale

Question 16

The ratio of mass to volume

Answer 16

Density

Question 17

the most commonly used units are _/__ for liquids
and solids, __/__for gasses.

Answer 17

g/mL
g/L

Question 18

are gas burners
which provide sufficient flexibility for most
heating operations in the laboratory.

Answer 18

Bunsen Burner or Tirril burner

Question 19

The three principal parts of the burner are

Answer 19

barrel/burner tube
air hole
base

Question 20

The
quantity of gas admitted to the burner can be
adjusted by the

Answer 20

Gas control Valve

Question 21

The air
is controlled by turning the ______ so as to make
the air hole larger or smaller.

Answer 21

collar

Question 22

Combustion occurs in the

Answer 22

Barrel

Question 23

three types of laboratory burners

Answer 23

Bunsen burner
Tirrill burner
Meker burner

Question 24

The curve of water in a test tube. Where you measure the volume water

Answer 24

Meniscus

Question 25

is a chemical reaction of two liquid substances resulting in the formation of solid particles.

Answer 25

Precipitation

Question 26

The solid particles in precipitation

Answer 26

Precipitate

Question 27

In the laboratory, dilute solutions are more often used than concentrated solutions. is prepared from a concentrated solution by mixing an aliquot portion of the concentrated solution with distilled water.

Answer 27

Dilution

Question 28

is prepared from a concentrated solution by mixing an aliquot portion of the concentrated solution with distilled water.

Answer 28

Dilution water

Question 29

In the laboratory, Which is more often used? dilute solutions or concentrated solutions

Answer 29

Dilute solution

Question 30

Separation Techniques

Answer 30

Sedimentation Decantation Filtration Centrifugation Evaporation Distillation

Question 31

the process of allowing heavy particles to settle out of the suspension under the influence of gravity.

Answer 31

Sedimentation

Question 32

The solid portion that is collected at the bottom of the container

Answer 32

Sediments

Question 33

the process of separation of liquid from solid and other immiscible (non-mixing) liquids by slowly pouring the liquid layer at the top of the mixture into another container. This technique is applicable in separating heterogeneous mixtures.

Answer 33

Decantation

Question 34

separation technique used to separate a solid substance such as a precipitate from the liquid in an insoluble solid-liquid mixture.

Answer 34

Filtration

Question 35

a laboratory technique that can be used to separate mixtures that cannot be separated by filtration. separation technique based on the differences of densities of particles in the mixture by means of centrifugal force.

Answer 35

Centrifugation

Question 36

separation technique that can be used to separate soluble solids in water. The technique is based on the difference in volatility of the solute and the solvent in the mixture. When a substance is volatile, it evaporates easily. Mixtures such as a salt solution can be separated into pure water and salt by means of evaporation. Water evaporates at a lower temperature as compared to table salt (NaCl).

Answer 36

Evaporation

Question 37

the technique of heating a liquid to create vapor which is collected when cooled to separate from the original solution. is based on the difference in boiling points or volatility of the components in the mixture. For example, in the salt-water mixture, water is volatile while salt is non-volatile. Heating will cause water in the salt solution to boil while salt remains in the solution

Answer 37

Distillation