Stoich And Measurement

Question 1

has only one marking; used in measuring volume precisely.

Answer 1

Volumetric flask

Question 2

Determination of the dimensions, capacity, quantity, or extent of
something

Answer 2

Measurement

Question 3

It is the process of obtaining the magnitude of a quantity relative to an
agreed standard.

Answer 3

Measurement

Question 4

It is composed of a number and a unit and is meaningless without the unit.

Answer 4

Measurement

Question 5

→ a property that is measured
→ Can be derived or fundamental
− Ex. mass, volume, length, time, temperature, pressure

Answer 5

Quantity

Question 6

Fundamental: simplest quantities

Answer 6

mass, volume, length, time, temperature, pressure

Question 7

Quantities (7)

Answer 7

Force, velocity, energy, electric current, acceleration, power

Question 8

A standard quantity against which a quantity is measured

− Ex.kg,L,m,s,K,Pa

Answer 8

Unit

Question 9

Used to describe quantities.

Answer 9

Unit

Question 10

Kg is a unit used to describe ?

Answer 10

Mass

Question 11

L is a unit used to describe

Answer 11

volume

Question 12

m describes

Answer 12

Length

Question 13

S describes

Answer 13

Time

Question 14

describes temperature,

Answer 14

K

Question 15

Unit of pressure

Answer 15

Pa

Question 16

− Units in commerce

− Units: Inch, foot, pound, quart, and gallon

Answer 16

English System

Question 17

− Used in scientific work

− Units: grams, meter, and liter

Answer 17

Metric System

Question 18

Measurement systems should be understandable to everyone hence
the creation of ?

Answer 18

SI system

Question 19

SI means?

Answer 19

“Système International d’Unités”

Question 20

The internationally adopted system which defines or expresses all quantities in terms of seven basic units, the six used by chemists being:

Answer 20

SI system

Question 21

the only unit not commonly used by chemists

Answer 21

Candela

Question 22

basis for 1 second. The old basis of a second was observed from the pendulum.

Answer 22

Cesium hyperfine splitting frequency

Question 23

the basis for luminous intensity.

Answer 23

Luminous efficacy of a specified monochromatic source

Question 24

Kg stands for?

Answer 24

Mass

Question 25

m stands for?

Answer 25

Length

Question 26

S stands for?

Answer 26

Second

Question 27

K stands for?

Answer 27

Temperature

Question 28

Mol stands for?

Answer 28

Amount of substance

Question 29

A stands for?

Answer 29

Electric current

Question 30

fixed value; does not change

Answer 30

Constant

Question 31

logical extension of the metric system

Answer 31

SI units

Question 32

SI units speed

Answer 32

m/s

Question 33

SI unit of density

Answer 33

kg/m3

Question 34

are used with these base units and other derived units to express small or large measured quantities in terms of a few simple digits

Answer 34

Prefixes

Question 35

1 kg = _____g

Answer 35

1000 g

Question 36

1 milligram (mg) =_______g

Answer 36

0.001 g

Question 37

What is the multplier of giga

Answer 37

10^9

Question 38

What is the multplier of mega

Answer 38

10 ^6

Question 39

What is the multplier of kilo

Answer 39

10^3

Question 40

What is the multplier of deci

Answer 40

10^-1

Question 41

What is the multplier of centi

Answer 41

10^-2

Question 42

What is the multplier of milli

Answer 42

10^-3

Question 43

results from counting objects or is part of a definition.

Answer 43

exact number

Question 44

results from a measurement or observation and contains some uncertainty.

Answer 44

inexact number

Question 45

Digits in a measurement that are known with certainty plus one digit that is estimated.

Answer 45

Significant figures

Question 46

Unit of density for solids

Answer 46

g/cm3

Question 47

Unit of density in liquid

Answer 47

g/mL

Question 48

Unit of density for gases

Answer 48

g/L

Question 49

Ratio of the density of a substance to the density of water. It is one of the few unitless quantities in Chemistry.

Answer 49

Specific gravity

Question 50

If is the density of the 𝑔/𝑚𝑙 substance the density of water that you will you use is the constant value is

Answer 50

1 𝑔 / 𝑚𝑙

Question 51

ρ𝑠𝑢𝑏𝑠𝑡𝑎𝑛𝑐𝑒 formula

Answer 51

𝑠𝑝𝑔𝑟𝑥ρ𝐻2O

Question 52

The specific gravity of a substance is equal to its _______, but contains no units

Answer 52

Density

Question 53

The specific gravity of a substance is equal to its density, but contains no units

Answer 53

MOLES

Question 54

SI unit for the amount of a chemical species

Answer 54

Mol

Question 55

Avogadro’s | number

Answer 55

(6.022 × 1023)

Question 56

Mass, in grams, of a substance that is numerically equivalent to the formula mass of the substance

Answer 56

Molar Mass

Question 57

is 1/1000 of a mole

Answer 57

Millimole

Question 58

A homogeneous mixture of two or more substances with each substance retaining its own chemical identity

Answer 58

SOLUTIONS

Question 59

cannot identify or distinguish the individual components in a mixture

Answer 59

homogeneous

Question 60

solution in which water is the solvent

Answer 60

Aqueous solution

Question 61

A solution in which a substance other than water is the solvent

Answer 61

→Nonaqueous solution

Question 62

Component of a solution that is usually present in the | greatest amount

Answer 62

Solvent

Question 63

Component of a solution that is usually present in a lesser amount relative to that of the solvent

Answer 63

Solutr

Question 64

A solution that contains a large amount of solute relative to the amount that could be dissolved

Answer 64

Concentrated solution:

Question 65

A solution that contains a small amount of solute relative to the amount that could be dissolved

Answer 65

Dilute solution:

Question 66

The process in which more solvent is added to a solution in order to lower its concentration

Answer 66

Dilution

Question 67

How would you prepare 100 mL of 0.9% saline solution in water from a 10% saline solution?

Answer 67

9 mL of 10% saline solution + 91 mL of water

Question 68

The amount of solute present in a specified amount of solution

Answer 68

PERCENT CONCENTRATION

Question 69

What is the percent by mass concentration of glucose in a solution made by dissolving 5.5 g of glucose in 78.2 g of water?

Answer 69

6.6% (m/m)

Question 70

Calculate the volume percent of solute in 30.0 mL of methyl alcohol in enough water to give 435 mL of solution.

Answer 70

6.90% (v/v)

Question 71

How many grams of sodium chloride are needed to prepare 150 mL of 0.9% (m/v) sodium chloride?

Answer 71

1.35 g of NaCl

Question 72

Moles of solute in a solution divided by the liters of solution

Answer 72

Molarity

Question 73

Calculate the molarity of a solution made from 20.0 g of NaOH in 250 mL of solution. ( ) moles of solute Molarity M = liters of solution

Answer 73

2.00 M

Question 74

The most common measure of concentration in the laboratory is?

Answer 74

Molarity