Atomic Theory
Positively charged atomic particle that gives an atom its identity.
What is a proton?
Matter is anything that has this and takes up space.
What is mass?
An educated guess made after research. Must be testable.
What is a hypothesis?
The number 405,000 has this many significant figures.
What is three?
Chemical or Physical Change: A precipitate is formed when 2 homogenous mixtures are combined.
What is a chemical change?
Negatively charged particle that is probably somewhere in a quantum energy level.
What is an electron?
This is non-matter but it helps describe the changes matter undergoes. Examples are UV light and gamma waves.
What is energy?
You make one of these based on observations and past knowledge.
What is an inference?
This number, represented in scientific notation. 12,120,000
What is 1.212 x 10^7 ?
What is the product?
Atoms with differing amounts of neutrons are called this.
What are isotopes?
This law states that matter cannot be created or destroyed, it can only change forms.
What is the Law of Conservation of Mass?
The one thing you change in an experiment. This is usually the x-axis on a graph.
What is the independent variable?
The more precise of these two measurements.
12.568 12.6
What is 12.568?
What is chromatography, distillation, crystallography, evaporation, and filtration?
Group 18 on the periodic table are very stable and snobby. They don't react well with other elements.
What are Noble Gases?
Matter can be separated into these two categories.
What is mixtures and pure substances?
The thing you measure in an experiment. Usually this is graphed on the y axis.
What is the dependent variable?
The product of 3.0 x 10^5 and 3.0 x 10^4
What is 9.0 x 10^9?
SI unit used to measure temperature change in a chemical reaction.
What is Kelvin or Celsius?
Add up the protons plus the neutrons and you will get this number.
What is the mass number?
James Dalton, the father of atomic theory, is credited with this law which states that compounds exist in a fixed ratio of elements no matter how much compound is present.
What is the Law of Definite Proportions?
The term used to describe values or measurements in an experiment which are close to one another, but not necessarily close to the accepted value.
What is precision?
What is 39%?
These phenomena usually indicate a chemical change or chemical reaction. Name at least three.
What is bubbling, popping, exploding, change in temperature, formation of precipitate, fizzing, and color change.