Vocabulary
Observation
Gathering information using senses or with the aid of instruments
The three main states of matter: solid, liquid, and gas.
Phases of Matter
An observation that involves a number or a measurement.
Quantitative Observation
The subatomic particle with a neutral charge.
Neutron
How is the periodic table arranged?
by increasing atomic number
Inference
A logical conclusion drawn from observations, previous knowledge, and available information
A change in a substance that does not alter its chemical identity, such as dissolving or melting.
Physical Change
The variable that a scientist measures to see if it responds to changes in the independent variable.
Dependent Variable
Atoms of the same element that have the same number of protons but different numbers of neutrons.
Isotope
How many elements does the Modern Periodic Table have?
118
Density
The ratio of a substance's mass to it's volume
Unique number that determines an element's identity, equal to the number of protons.
Atomic Number
4 ways to analyze, organize and present data.
Data table, bar graph, circle graph, line graph
What is Thomson's Atomic model generally referred as
The Plum Pudding theory
What are the two languages used to name all the elements in the periodic table?
English and Latin
A well-tested description of one phenomenon in the natural world that often includes mathematical terms
Scientific Law
Baking cake, burning wood, rusting iron, photo synthesis are all examples of what?
Chemical change
Steps of the Scientific Process in Order.
1. Observation
2. Ask a question
3. Form a hypothesis
4. Develop an experiment
5. Analyze data and draw conclusions
When did Mendeleev develop his periodic table?
1870s
What is the element symbol, atomic number and average atomic mass of Argon?
Ar, 18, 39.9
Electrons that are in the highest energy level of an atom of an element
Valence Electrons
The kind of mixture that is uniformly blended, such as salt dissolved in water.
Homogenous mixture
What are the three standard units (SI) of measuring?
Kilogram for mass
Meter for length
Second for time
The theory that described the atom as a solid sphere, proposed in the early 1800s.
Dalton's Atomic Theory
What are the 4 groups the elements are categorized in?
Nonmetals, standard metals, transition metals, Inner transition