UNIT 1
What are the five steps of the scientific process?
What is the mass number of an atom determined by?
It is determined by adding the number of neutrons and protons in the nucleus of an atom
What is the octet rule?
The first 20 elements, except hydrogen and helium, have full valence shells when they contain eight valence electrons
What is a chemical reaction?
A change that occurs when the identity of a chemical transforms into another substance or substances
How does temperature affect solubility?
The higher the temperature, the greater the solubility
What are the four signs of a chemical change?
Change in color, gas formation, solid formation, and energy change
How does the amount of particles in a fluid affect its density?
The more particles a fluid contains, the more dense it is. The fewer particles a fluid contains, the less dense it is.
What is an ionic bond?
It is an attraction between oppositely charged ions
Single displacement reaction, decomposition reaction, synthesis reaction, double displacement reaction, and combustion.
What are acids?
They are substances that break apart to form an excess of hydrogen ions when dissolved in water
What are physical properties?
Any features that can be observed or measured without altering the substance’s identity
What is Pascal's principle?
This principle states that external pressure placed on a fluid-filled container spreads equally and affects all parts of the fluid.
What is a covalent bond?
It is the sharing of an electron pair between two atoms
What are the three types of radiation?
They are alpha, beta, and gamma
What are bases?
They are substances that break apart to form an excess of hydroxide ions when dissolved in water