Scientific Method
What is a prediction?
Statement about what will happen in the future based on past experience and evidence
What is matter?
Anything that has mass and takes up space
What is an atom?
The smallest piece of matter
The elements on the PT are organized by increasing _________________
Atomic Number
In a chemical reaction, the arrow stands for _______
Yield
What is classifying?
Grouping together items that are alike in some way
What are the two types of mixtures?
Homogeneous and Heterogeneous
List the three particles inside an atom
Protons, Neutrons, and Electrons
On the PT, the columns are called ________ and the rows are called ________
Groups/Families, Periods
The elements on the left side of the chemical equation are called ___________ and the right side are called ___________
Reactants, Products
What is evaluating?
Comparing observations and data to reach a conclusion
What is a substance?
Matter that is 100% pure
Where are the electrons located in an atom?
Outside the nucleus
Group 18, the last group on the PT, is called the ______________ family
Noble Gas
What are the three classifications of chemical reactions? (must say the whole word)
Synthesis, Decomposition, and Replacement
What are the two types of observations?
Qualitative and Quantitative
What is the difference between an element and a compound?
An element is a single type of atom from the PT, and a compound is a group of two or more elements
Which particle in an atom has a positive charge?
Proton
As you move to the right and down the PT, what happens to the atomic masses of the elements
Atomic mass increases
Balance:
__ PCl5 + __ H2O -> __ H3PO4 + __ HCl
1 , 4 , 1 , 5
List the steps of the scientific method in order
Ask a question (observation), make a hypothesis, conduct an experiment, draw a conclusion, share your results
List a piece of matter that would be classified as each: element, compound, homogeneous, and heterogeneous
answers will vary
Which model of the atom shows the electrons in rings/shells around the nucleus? (give me the scientists name)
Bohr's Model
Elements in the same group/family all have the same number of _________________
Valence Electrons
Balance:
__ FeS + __ O2 -> __ Fe2O3 + __ SO2
4 , 7 , 2 , 4