Science Recitation 13-16 Flashcards
Week 13
What do we call the number of protons in the nucleus of an atom?
The atomic number.
Week 13
What is the atomic mass of an element?
The atomic mass is the average mass of the atoms of an element.
Week 13
Who designed the Periodic Table of the Elements?
Dmitri Mendeleev designed the Periodic Table of the Elements.
Week 13
What is a compound?
A compound is a substance composed of two or more elements that are chemically bonded together.
Week 13
What is a mixture?
A mixture is a combination of substances that occurs without any chemical reaction.
Week 14
What is an ion?
An ion is an atom with a net charge.
Week 14
How does an ion form?
An ion forms when an atom gains or loses one or more electrons.
Week 14
List two kinds of mixtures.
Homogeneous mixtures and heterogeneous mixtures.
Week 14
What do we call a homogeneous mixture that forms when one substance dissolved into another?
A solution
Week 14
Which component of a solution is present in the larger amount?
The solvent
Week 14
Which component of a solution is present in the smaller amount?
The solute
Week 15
What is the goal of science?
The goal of science is to describe how the natural world works.
Week 15
What are the five main branches of natural science?
Chemistry, Physics, Earth Science, Astronomy, and Biology.
Week 16
List the basic tools of science.
Observation, experimentation, and reasoning.
Week 16
What is a hypothesis?
A hypothesis is a testable prediction.
