Summarizes current status of our knowledge about acid-base interactions, including Lewis considerations, experimental design, data about donor-acceptor systems, common misconceptions, and hard-soft acid-base model. Indicates that there is the possibility of developing unifying concepts for chemical reactions of inorganic compounds. (CC)

Discusses fundamentals of rainbow formation, including the reflection and dispersion theories underlying primary, secondary and high-order bows. Included is a series of further analytical problems. (CC)

In the rural school the tasks of polytechnical labor education are determined by the objective demands of scientific and technical progress in agricultural production, by its content, and by the nature of the labor of leading workers. (Author)

Describes an approach which begins with observations and systems familiar to the student and proceeds to develop and test models to explain them. Experimental topics include Brownian motion, a germinating cell, phase change of p-dichlorobenzene, extension and contraction of rubber, and an enzyme system. (GS)

Presents a rationale for providing preschool children with experiences related to classification, seriation, and pattern recognition because they are means by which a child can organize the world around him. These are considered to be the early steps in the long developmental sequence leading to logical thinking and reflective observation. (GS)

ELEMENTARY SCHOOL PUPILS' ABILITY TO USE EVIDENCE FROM SCIENTIFIC INSTRUMENTS WAS DETERMINED. THE 320 PUPILS FROM GRADES ONE THROUGH SIX WERE PLACED IN DECISION-MAKING SITUATIONS REQUIRING THEM TO USE EVIDENCE FROM A PLATFORM BALANCE OR GRADUATED CYLINDER. PUPILS WERE REQUIRED TO DIFFERENTIATE BETWEEN MASSES OR VOLUMES OF PAIRS OF OBJECTS. THE…

Presented is the first in a series of four books on energy designed for the junior high school language arts curriculum. Each of the 10 articles included is scored for readability according to the Gunning Fog Index. By referring to these ratings, a teacher can provide students with increasingly more challenging reading material. Among these…

INVESTIGATED WERE THE LEVELS OF UNDERSTANDING OF SELECTED CONCEPTS CONCERNING THE PARTICLE NATURE OF MATTER AND THE RELATIONSHIP OF THE STUDENTS' MATURITY AND CONCEPTUAL UNDERSTANDING. THE STUDENTS SAMPLED WERE OF HIGH AND AVERAGE IQ, AND IN GRADES 2-5. ALL GROUPS RECEIVED COMPARABLE INSTRUCTION. USED WERE ALTERNATE RESPONSE TAXONOMY-TYPE…

REPORTED IS A STUDY CONDUCTED TO DETERMINE THE RELATIVE LEVELS OF UNDERSTANDING OF CERTAIN FORCE CONCEPTS ACHIEVED BY PUPILS IN GRADES 2-6. EVALUATIONS WERE MADE BY MEANS OF PENCIL-AND-PAPER MULTIPLE-CHOICE TYPE TESTS, ONE FOR EACH LEVEL OF UNDERSTANDING--(1) KNOWLEDGE, (2) COMPREHENSION, AND (3) APPLICATION. SUB-PROBLEMS OF THE STUDY WERE (1) TO…

The Springs Task measures the ability to conduct controlled experiments, name variables, and criticize variables which are demonstrated to the subject. It provides an operational definition of formal thought. Subjects aged ten to adult can be tested with this instrument, an apparatus-based task administered individually in a 15-minute interview.…

This report represents an attempt made by the field staff of a Summer Institute of Linguistics at the University of Papua New Guinea to improve the existing educational programs, which, by and large, are centrally produced in an expatriate-dominated context, and administered country-wide. Based on the assumption that language and social structure…

Nuclear physics fundamentals are presented in this sixth unit of the Project Physics text for use by senior high students. Included are discussions of radioactivity, taking into account Bacquerel's discovery, radioactive elements, properties of radiations, radioactive transformations, decay series, and half-lives. Isotopes are analyzed in…

The Technology Application Center (TAC) at the University of New Mexico is one of six National Aeronautics and Space Administration (NASA) regional dissemination centers originally established to disseminate NASA technology to private industry on a regional basis. A fee is charged for TAC's services so it has been market oriented and has sought to…

Reported is a study designed to determine the current status of acceptance of science misconceptions by college freshmen with poverty backgrounds and to determine the influence of integrated secondary education on educational development. A sample of 350 students was used as subjects for this study. They were selected to represent four distinct…