WELCOME TO THIS GREAT EDUCATIONAL BLOG

Welcome to my Pre-Nursing Exam Prep blog. I hope it will help you prepare very well for the Pre-NLN entrance exam, popularly known as the PAX exam. This is one of the entrance exams required by some schools for those who want to pursue careers in the nursing field in the USA. I will attempt to break down the review materials into manageable parts so that you can systematically and efficiently prepare for the test with less stress. I will guide you to prepare for the entire content of the test. Hopefully, you will be able to pass after going through these series.


BEST OF LUCK!


To support this blog you can make a donation by clicking on the link below:
Become a Patron!

A 12-DAY APPROACH TO ACE THE EXAM

SCIENCE REVIEWThe topics that are generally covered in the test have been grouped into twelve instructional modules below. You will be tested only on the basic concepts of physics, chemistry and biology. Click on science topics and select any of the topics listed in the module to review.

Lesson 1:

Basic structure of atom

Types of tissues

Lesson 2:

Movement of substances across the cell membrane

Acids and bases, pH scale

Carbohydrates, proteins, lipids and nucleic acids

Lesson 3:

Basic structure of the eye

Basic structure of the ear

Nervous system

Lesson 4:

Circulatory system

Introduction to mechanics (motion/forces)

Electrical circuits

Lesson 5:

Balancing chemical equations and writing formulas

Essentials of photosynthesis and respiration

Classifying organic compounds

Magnetism

Electromagnetism

Lesson 6:

Interpretation of graphs and pictograms

Analyzing and making conclusions from experiments

Data analysis

Lesson 7:

Endocrine system

Digestive system

Genitourinary system

Lesson 8:

Reproduction in mammals

Basic parts of a flower

Reproduction in plants (the process of pollination

Genetics

Lesson 9:

Modes of heat transfer

Calculating heat energies and phase diagrams

Temperature conversions (Kelvin, Celsius, Fahrenheit)

Lesson 10:

Gas laws (Boyle, Charles, Gay-Lussac)

Types of energy (Potential, kinetic, etc…..)

Chemical bonds, equilibrium and equilibrium constants

Mixtures, types of solutions, solubility

Lesson 11:

Concepts of the food pyramid, food web and food chain

Light (diffraction, refraction, reflection, dispersion)

Basic concepts on waves

Sound waves

Catalyst and enzymes

Lesson 12:

Symbiosis

Ecology

The Electroscope

Radioactivity and half-life Tropism

Tropism

Tuesday, June 23, 2015

OVERVIEW OF TOPICS COVER IN THIS BLOG

If you have just stumbled on this page by chance, YOU ARE WELCOME! The are many topics covers in this blog. You can do a search on the blog using various phrases or subject matter. Here is a summary of some of the topics covered.


Lesson 1:
Basic structure of atom
Types of tissues
Lesson 2:
Movement of substances across the cell membrane
Acids and bases, pH scale
Carbohydrates, proteins, lipids and nucleic acids
Lesson 3:
Basic structure of the eye
Basic structure of the ear
Nervous system
Lesson 4:
Circulatory system
Introduction to mechanics (motion/forces)
Electrical circuits
Lesson 5:
Balancing chemical equations and writing formulas
Essentials of photosynthesis and respiration
Classifying organic compounds
Magnetism
Electromagnetism
Lesson 6:
Interpretation of graphs and pictograms
Analyzing and making conclusions from experiments
Data analysis
Lesson 7:
Endocrine system
Digestive system
Genitourinary system
Lesson 8:
Reproduction in mammals
Basic parts of a flower
Reproduction in plants (the process of pollination
Genetics
Lesson 9:
Modes of heat transfer
Calculating heat energies and phase diagrams
Temperature conversions (Kelvin, Celsius, Fahrenheit)
Lesson 10:
Gas laws (Boyle, Charles, Gay-Lussac)
Types of energy (Potential, kinetic, etc…..)
Chemical bonds, equilibrium and equilibrium constants
Mixtures, types of solutions, solubility
Lesson 11:
Concepts of the food pyramid, food web and food chain
Light (diffraction, refraction, reflection, dispersion)
Basic concepts on waves
Sound waves
Catalyst and enzymes
Lesson 12:
Symbiosis
Ecology
The Electroscope
Radioactivity and half-life Tropism
Tropism

Tuesday, June 16, 2015

RELATIVE ATOMIC MASS QUESTIONS

Question 1:
Calculate the relative atomic mass of silver if it occurs naturally as 51.84% silver-107 and 48.18% silver-109.

Solution:
Relative atomic mass = 0.5184 (107) + 0.4816 (109)
Relative atomic mass = 107.96

Question 2:
Calculate the relative abundance of each isotope of copper if it consists of two isotopes, copper-63 and copper-65. Its relative atomic mass is 63.62.

Solution:
Let Abundance of copper-63 = x
Then, Abundance of copper-65 = 1-x

Relative atomic mass = 63x + 65(1-x)
                                      63x + 65(1-x) = 63.62
                                       x = 0.69
That is, 69% of copper-63 and 31% of copper-65

THE MASS SPECTROMETER

The mass spectrometer is an instrument used for analyzing samples of elements and compounds. It consists of six basic stages: Injection, Vaporization,  Ionization, Acceleration, Deflection, and  Detection.

Click to view a diagram of the mass spectrometer.
  • The sample is injected into the instrument.
  •  It may be vaporized by heating. 
  • The vaporized sample is then passed into an ionizing beam of electrons which knock electrons off the sample to create positive ions.
  • These positive ions are then accelerated by some electrostatically charged plates into a magnetic field.
  • The magnetic field then deflects the particles according to their mass/charge ratio.
  • The deflected ions then arrive at the detector.
You can test yourself on the atomiser by clicking this link. It is a timed quiz.